Merge branch 'feat/obfs4-kotlin-elligator2' into 'main'
obfs4 for Android, part 1: Elligator2 See merge request paulhitt/flamenet-messenger-android!77
This commit was merged in pull request #104.
This commit is contained in:
Paul Hitt
@@ -12,6 +12,9 @@ plugins {
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repositories { mavenCentral() }
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dependencies {
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// The obfuscated transport. Only reached when a bridge is configured; with
|
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// none set, nothing in here runs and `defaultHttpClient()` is unchanged.
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implementation(project(":obfs4"))
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api(project(":engine"))
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implementation("com.squareup.okhttp3:okhttp:4.12.0")
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compileOnly("org.json:json:20240303")
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||||
@@ -6,6 +6,8 @@ import io.flamenet.e2e.PeerBundle
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import okhttp3.HttpUrl
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import okhttp3.HttpUrl.Companion.toHttpUrl
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import okhttp3.MediaType.Companion.toMediaType
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import io.flamenet.obfs4.Obfs4Bridge
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import io.flamenet.obfs4.Obfs4SocketFactory
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import okhttp3.OkHttpClient
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import okhttp3.Request
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import okhttp3.RequestBody
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@@ -62,13 +64,40 @@ class RelayClient(
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/** The relay's own 10 MiB per-blob limit, with slack (audit M5). */
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const val HARD_ATTACHMENT_CAP = 12L * 1024 * 1024
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fun defaultHttpClient(): OkHttpClient = OkHttpClient.Builder()
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.callTimeout(25, TimeUnit.SECONDS)
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||||
// No response cache, deliberately. The payloads are ciphertext, but
|
||||
// sealed blobs and envelope traffic surviving on disk after the user
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||||
// deletes a chat is exactly what "deleted means deleted" forbids.
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.cache(null)
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.build()
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/**
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* @param bridge when set, every request is carried inside obfs4 to that
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* bridge, which proxies on to the relay.
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*
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||||
* 🔴 **Null by default, and that is the shipping configuration.** obfs4
|
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* is for reaching a relay on a network that blocks or fingerprints TLS
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* to it. Turning it on for everyone would change the network path for
|
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* every user to solve a problem most of them do not have, and — on a
|
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* host where the bridge shares the relay's address — would not even help
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* against IP blocking.
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*
|
||||
* ⚠️ **The bridge is a separate hop, so obfs4 hides traffic from the
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* NETWORK, not from us.** It is not a privacy feature against the
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* operator, and must never be described as one.
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||||
*/
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||||
fun defaultHttpClient(bridge: Obfs4Bridge? = null): OkHttpClient =
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OkHttpClient.Builder()
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.callTimeout(25, TimeUnit.SECONDS)
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// No response cache, deliberately. The payloads are ciphertext, but
|
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// sealed blobs and envelope traffic surviving on disk after the user
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// deletes a chat is exactly what "deleted means deleted" forbids.
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.cache(null)
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.apply {
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if (bridge != null) {
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socketFactory(Obfs4SocketFactory(bridge))
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// ⚠️ **Connections must not be pooled across a transport
|
||||
// change**, and the handshake makes each one expensive to
|
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// establish, so the pool is kept but the idle window is
|
||||
// short: a bridge that goes away should not leave requests
|
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// queued behind a dead tunnel for minutes.
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connectionPool(okhttp3.ConnectionPool(4, 2, TimeUnit.MINUTES))
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||||
}
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||||
}
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.build()
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}
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/**
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||||
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@@ -0,0 +1,51 @@
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plugins {
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kotlin("jvm")
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||||
jacoco
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||||
}
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repositories { mavenCentral() }
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||||
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||||
dependencies {
|
||||
// 🔴 **The whole reason this port is small.** The Swift implementation had
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// to hand-write SipHash-2-4, XSalsa20 and Poly1305 because CryptoKit
|
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// exposes none of them, and its own field arithmetic because Apple gives
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||||
// nothing below X25519. BouncyCastle has all four, vetted and
|
||||
// constant-time where it matters: `X25519Field` (including `sqrtRatioVar`,
|
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// exactly the primitive Elligator2 needs), `XSalsa20Engine`, `Poly1305`.
|
||||
//
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||||
// ⚠️ That means the two clients do NOT share an implementation. They share
|
||||
// the vectors and the live interop harness, which is what actually keeps
|
||||
// them honest — see `Obfs4VectorTest`.
|
||||
//
|
||||
// Already a dependency of `:engine`, for the same class of reason: taking a
|
||||
// vetted constant-time implementation over hand-rolling arithmetic on a
|
||||
// secret scalar.
|
||||
implementation("org.bouncycastle:bcprov-jdk18on:1.79")
|
||||
|
||||
// ⚠️ compileOnly: the transport must not drag OkHttp into anything that
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// does not already have it. `:client` supplies the real one.
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compileOnly("com.squareup.okhttp3:okhttp:4.12.0")
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testImplementation("com.squareup.okhttp3:okhttp:4.12.0")
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testImplementation(kotlin("test"))
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||||
testImplementation("org.json:json:20240303")
|
||||
}
|
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|
||||
kotlin {
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||||
compilerOptions {
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||||
jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
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||||
}
|
||||
}
|
||||
java {
|
||||
sourceCompatibility = JavaVersion.VERSION_17
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||||
targetCompatibility = JavaVersion.VERSION_17
|
||||
}
|
||||
|
||||
tasks.test {
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||||
useJUnitPlatform()
|
||||
testLogging { events("passed", "failed", "skipped"); showStandardStreams = true }
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}
|
||||
tasks.withType<Test>().configureEach { finalizedBy(tasks.named("jacocoTestReport")) }
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tasks.named<JacocoReport>("jacocoTestReport") {
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||||
dependsOn(tasks.named("test"))
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||||
reports { xml.required.set(true); html.required.set(true) }
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||||
}
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||||
@@ -0,0 +1,297 @@
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package io.flamenet.obfs4
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/**
|
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* The packet layer, which sits inside frames.
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*
|
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* uint8 type 0 = payload, 1 = PRNG seed
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||||
* uint16 length payload length, big endian
|
||||
* uint8[] payload
|
||||
* uint8[] padding zeros, ignored
|
||||
*
|
||||
* ⚠️ **Padding lives here, not in the frame.** A frame's length is whatever it
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||||
* is; the packet declares how much of it is real. That is what lets obfs4 make
|
||||
* every write an arbitrary size on the wire without the peer having to care.
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||||
*/
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||||
object Obfs4Packet {
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const val OVERHEAD = 3
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const val MAX_PAYLOAD_LENGTH = FrameEncoder.MAX_PAYLOAD_LENGTH - OVERHEAD
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const val TYPE_PAYLOAD = 0
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const val TYPE_PRNG_SEED = 1
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class TooShort(val size: Int) : Exception("packet too short: $size")
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/**
|
||||
* 🔴 A declared length longer than the packet. **Verified in the Swift port:
|
||||
* deleting this check turns one malformed packet into an out-of-bounds
|
||||
* crash** — a remote denial of service costing an attacker three bytes.
|
||||
*/
|
||||
class DeclaredLengthExceedsPacket(val declared: Int, val available: Int) :
|
||||
Exception("declared $declared but only $available available")
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||||
class PayloadTooLong(val size: Int) : Exception("payload too long: $size")
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||||
|
||||
fun encode(type: Int, payload: ByteArray, padding: Int): ByteArray {
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||||
if (payload.size + padding > MAX_PAYLOAD_LENGTH) {
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||||
throw PayloadTooLong(payload.size + padding)
|
||||
}
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||||
return byteArrayOf(type.toByte(), (payload.size shr 8).toByte(), payload.size.toByte()) +
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||||
payload + ByteArray(padding)
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||||
}
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||||
|
||||
/**
|
||||
* ⚠️ An unknown `type` is **ignored**, not rejected — the reference does this
|
||||
* so the protocol can gain packet types without breaking older peers. A
|
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* parser that errored here would fail against a future bridge.
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||||
*
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||||
* Returns `null` as the type when it is unknown.
|
||||
*/
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||||
fun decode(packet: ByteArray): Pair<Int?, ByteArray> {
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||||
if (packet.size < OVERHEAD) throw TooShort(packet.size)
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||||
val declared = ((packet[1].toInt() and 0xff) shl 8) or (packet[2].toInt() and 0xff)
|
||||
val available = packet.size - OVERHEAD
|
||||
if (declared > available) throw DeclaredLengthExceedsPacket(declared, available)
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||||
val type = when (packet[0].toInt() and 0xff) {
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||||
TYPE_PAYLOAD -> TYPE_PAYLOAD
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||||
TYPE_PRNG_SEED -> TYPE_PRNG_SEED
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||||
else -> null
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||||
}
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||||
return type to packet.copyOfRange(OVERHEAD, OVERHEAD + declared)
|
||||
}
|
||||
}
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||||
|
||||
/**
|
||||
* Rejects handshakes that have been seen before.
|
||||
*
|
||||
* 🔴 **Anti-replay is probe resistance, not just an integrity check.** Without
|
||||
* it a scanner can record one real client's handshake and replay it to confirm
|
||||
* a bridge is there — the server would answer, which is the one thing it must
|
||||
* never do for anyone who cannot construct a fresh valid handshake.
|
||||
*
|
||||
* 🔴 **Share ONE of these across all connections.** A replay is by definition a
|
||||
* handshake seen on a *different* connection; a per-connection filter catches
|
||||
* nothing and leaves the probe it exists to stop wide open.
|
||||
*/
|
||||
class ReplayFilter(private val lifetimeMillis: Long = 3_600_000) {
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||||
private val seen = HashMap<String, Long>()
|
||||
|
||||
/** `true` means this MAC has been seen — reject. */
|
||||
@Synchronized
|
||||
fun testAndSet(mac: ByteArray, nowMillis: Long = System.currentTimeMillis()): Boolean {
|
||||
if (seen.size > 1000) seen.entries.removeIf { nowMillis - it.value >= lifetimeMillis }
|
||||
val key = mac.joinToString("") { "%02x".format(it) }
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||||
val first = seen[key]
|
||||
if (first != null && nowMillis - first < lifetimeMillis) return true
|
||||
seen[key] = nowMillis
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
/** Everything both ends compute the same way. */
|
||||
object Obfs4Session {
|
||||
/**
|
||||
* `Kdf(KEY_SEED, 144)` — a framing key for each direction.
|
||||
*
|
||||
* ⚠️ **The halves swap by role.** The client encodes with the first and
|
||||
* decodes with the second; the server does the reverse. Getting this
|
||||
* backwards produces two ends that each work perfectly alone and cannot hear
|
||||
* each other — and only a client-to-server test catches it, never a
|
||||
* client-only one.
|
||||
*/
|
||||
fun directionKeys(keySeed: ByteArray, isClient: Boolean): Pair<ByteArray, ByteArray> {
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||||
val okm = Ntor.kdf(keySeed, FrameEncoder.KEY_LENGTH * 2)
|
||||
val first = okm.copyOfRange(0, FrameEncoder.KEY_LENGTH)
|
||||
val second = okm.copyOfRange(FrameEncoder.KEY_LENGTH, okm.size)
|
||||
return if (isClient) first to second else second to first
|
||||
}
|
||||
}
|
||||
|
||||
/** The data plane: packets in frames, both directions. */
|
||||
class Obfs4DataPlane(encodeKey: ByteArray, decodeKey: ByteArray) {
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||||
private val encoder = FrameEncoder(encodeKey)
|
||||
private val decoder = FrameDecoder(decodeKey)
|
||||
private val inbound = mutableListOf<Byte>()
|
||||
|
||||
/** The length distribution, rebuilt when a peer sends its seed. */
|
||||
var lengthDist: WeightedDist? = null
|
||||
private set
|
||||
|
||||
/**
|
||||
* ⚠️ **Payloads are split, not truncated.** A write larger than one packet
|
||||
* spans several; a caller that silently dropped the remainder would corrupt
|
||||
* the stream in a way only the far end notices.
|
||||
*/
|
||||
fun send(payload: ByteArray, padding: Int = 0): ByteArray {
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||||
var out = ByteArray(0)
|
||||
var offset = 0
|
||||
do {
|
||||
val room = Obfs4Packet.MAX_PAYLOAD_LENGTH - padding
|
||||
val n = minOf(room, payload.size - offset)
|
||||
out += encoder.encode(
|
||||
Obfs4Packet.encode(Obfs4Packet.TYPE_PAYLOAD,
|
||||
payload.copyOfRange(offset, offset + n), padding))
|
||||
offset += n
|
||||
} while (offset < payload.size)
|
||||
return out
|
||||
}
|
||||
|
||||
/** Padding-only traffic, for cover when there is nothing to say. */
|
||||
fun sendPadding(length: Int): ByteArray =
|
||||
encoder.encode(Obfs4Packet.encode(Obfs4Packet.TYPE_PAYLOAD, ByteArray(0), length))
|
||||
|
||||
/** The server's opening move: hand the client a seed so both pad alike. */
|
||||
fun sendPrngSeed(seed: ByteArray, padding: Int = 0): ByteArray {
|
||||
require(seed.size == 24) { "a DRBG seed is 24 bytes" }
|
||||
return encoder.encode(Obfs4Packet.encode(Obfs4Packet.TYPE_PRNG_SEED, seed, padding))
|
||||
}
|
||||
|
||||
/**
|
||||
* Feed everything the socket gave you; get back the application data in it.
|
||||
*
|
||||
* ⚠️ Frames arrive split across reads and several to a read, so the buffer
|
||||
* is retained between calls and "need more data" is a normal outcome.
|
||||
*/
|
||||
fun receive(bytes: ByteArray, isClient: Boolean = true): ByteArray {
|
||||
inbound.addAll(bytes.toList())
|
||||
var application = ByteArray(0)
|
||||
while (true) {
|
||||
val packet = try { decoder.decode(inbound) }
|
||||
catch (_: FrameDecoder.NeedMoreData) { break }
|
||||
val (type, payload) = Obfs4Packet.decode(packet)
|
||||
when (type) {
|
||||
Obfs4Packet.TYPE_PAYLOAD -> application += payload
|
||||
// 🔴 Only a client adopts a seed. A server that honoured one
|
||||
// would let any peer dictate its padding, which is a channel a
|
||||
// censor could use to make traffic recognisable.
|
||||
Obfs4Packet.TYPE_PRNG_SEED ->
|
||||
if (isClient && payload.size == 24) {
|
||||
lengthDist = WeightedDist(payload, 0, FrameEncoder.MAX_SEGMENT_LENGTH, true)
|
||||
}
|
||||
else -> Unit // unknown type: ignored by design
|
||||
}
|
||||
}
|
||||
return application
|
||||
}
|
||||
}
|
||||
|
||||
/** Drives a client from "nothing sent" to "keys established". */
|
||||
class Obfs4ClientHandshake(
|
||||
private val nodeId: ByteArray,
|
||||
private val serverIdentityPublic: ByteArray,
|
||||
private val sessionPrivate: ByteArray,
|
||||
private val sessionPublic: ByteArray,
|
||||
private val sessionRepresentative: ByteArray,
|
||||
private val epochHour: Long,
|
||||
) {
|
||||
private val macKey = Obfs4Handshake.macKey(serverIdentityPublic, nodeId)
|
||||
private var buffer = ByteArray(0)
|
||||
|
||||
class InvalidHandshake : Exception("the bridge's handshake did not verify")
|
||||
class AuthMismatch : Exception("ntor AUTH mismatch — this is not the bridge we expect")
|
||||
class NtorFailed : Exception("ntor handshake failure")
|
||||
|
||||
/**
|
||||
* ⚠️ Padding length is the caller's to choose, from
|
||||
* `CLIENT_MIN_PAD_LENGTH..CLIENT_MAX_PAD_LENGTH`, and must come from a
|
||||
* CSPRNG: a predictable handshake length is a fingerprint on its own.
|
||||
*/
|
||||
fun opening(padding: ByteArray): ByteArray {
|
||||
require(padding.size in Obfs4Handshake.CLIENT_MIN_PAD_LENGTH..Obfs4Handshake.CLIENT_MAX_PAD_LENGTH) {
|
||||
"padding outside the permitted range"
|
||||
}
|
||||
return Obfs4Handshake.clientMessage(sessionRepresentative, padding, macKey, epochHour)
|
||||
}
|
||||
|
||||
class Established(val keySeed: ByteArray, val leftover: ByteArray)
|
||||
|
||||
/**
|
||||
* `null` means keep reading and stay silent.
|
||||
*
|
||||
* 🔴 **Returns the leftover BYTES, not an offset.** An offset would be an
|
||||
* index into the buffer accumulated across *all* calls, which a caller
|
||||
* feeding one socket read at a time does not have — the Swift port crashed
|
||||
* on exactly that the first time a server handshake spanned two reads,
|
||||
* which is routine over a real network and almost never happens over
|
||||
* loopback.
|
||||
*
|
||||
* ⚠️ Those bytes are already framed traffic, usually the bridge's PRNG seed
|
||||
* riding in the same segment. Dropping them desynchronises the decoder.
|
||||
*/
|
||||
fun receive(bytes: ByteArray): Established? {
|
||||
buffer += bytes
|
||||
val parsed = try {
|
||||
Obfs4Handshake.parseServerMessage(buffer, macKey, epochHour)
|
||||
} catch (_: Obfs4Handshake.NeedMoreData) {
|
||||
return null
|
||||
} catch (e: Exception) {
|
||||
throw InvalidHandshake()
|
||||
}
|
||||
|
||||
val serverPublic = Elligator2.publicKeyFromRepresentative(parsed.representative)
|
||||
val result = Ntor.clientHandshake(
|
||||
sessionPrivate, sessionPublic, serverPublic, serverIdentityPublic, nodeId,
|
||||
) ?: throw NtorFailed()
|
||||
|
||||
// 🔴 Constant-time, and non-negotiable: this is what proves the peer
|
||||
// holds the bridge's identity key rather than merely having seen a
|
||||
// handshake.
|
||||
if (!Ntor.authMatches(result.auth, parsed.auth)) throw AuthMismatch()
|
||||
return Established(result.keySeed, buffer.copyOfRange(parsed.consumed, buffer.size))
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Drives a bridge from "a client connected" to "keys established".
|
||||
*
|
||||
* 🔴 **Every failure here must be silent to the peer.** obfs4's probe
|
||||
* resistance is that a bridge which cannot verify a handshake behaves exactly
|
||||
* like a service that is not there. Errors go to the caller; the caller's only
|
||||
* correct response is to keep reading nothing and eventually drop the
|
||||
* connection.
|
||||
*/
|
||||
class Obfs4ServerHandshake(
|
||||
private val nodeId: ByteArray,
|
||||
private val identityPrivate: ByteArray,
|
||||
private val identityPublic: ByteArray,
|
||||
private val sessionPrivate: ByteArray,
|
||||
private val sessionPublic: ByteArray,
|
||||
private val sessionRepresentative: ByteArray,
|
||||
private val epochHour: Long,
|
||||
) {
|
||||
private val macKey = Obfs4Handshake.macKey(identityPublic, nodeId)
|
||||
private var buffer = ByteArray(0)
|
||||
|
||||
class InvalidHandshake : Exception("the client's handshake did not verify")
|
||||
class Replayed : Exception("this handshake has been seen before")
|
||||
class NtorFailed : Exception("ntor handshake failure")
|
||||
|
||||
class Accepted(val keySeed: ByteArray, val reply: ByteArray, val consumed: Int)
|
||||
|
||||
/**
|
||||
* ⚠️ **The reply must be MAC'd under the hour the CLIENT used, not ours.** A
|
||||
* client whose clock is an hour off is accepted — that is what the ±1 window
|
||||
* is for — but it will only accept a reply computed under *its* hour. Using
|
||||
* the server's own works in a test where both share a clock, and fails for
|
||||
* every real client with a slow one.
|
||||
*/
|
||||
fun receive(bytes: ByteArray, padding: ByteArray, replayFilter: ReplayFilter,
|
||||
nowMillis: Long = System.currentTimeMillis()): Accepted? {
|
||||
buffer += bytes
|
||||
val parsed = try {
|
||||
Obfs4Handshake.parseClientMessage(buffer, macKey, epochHour)
|
||||
} catch (_: Obfs4Handshake.NeedMoreData) {
|
||||
return null
|
||||
} catch (e: Exception) {
|
||||
throw InvalidHandshake()
|
||||
}
|
||||
|
||||
if (replayFilter.testAndSet(parsed.mac, nowMillis)) throw Replayed()
|
||||
|
||||
val clientPublic = Elligator2.publicKeyFromRepresentative(parsed.representative)
|
||||
val result = Ntor.serverHandshake(
|
||||
clientPublic, sessionPrivate, sessionPublic, identityPrivate, identityPublic, nodeId,
|
||||
) ?: throw NtorFailed()
|
||||
|
||||
val reply = Obfs4Handshake.serverMessage(
|
||||
sessionRepresentative, result.auth, padding, macKey, parsed.epochHour)
|
||||
return Accepted(result.keySeed, reply, parsed.consumed)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,296 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.bouncycastle.math.ec.rfc7748.X25519Field
|
||||
|
||||
/**
|
||||
* Elligator2 for Curve25519, in the flavour obfs4 uses.
|
||||
*
|
||||
* 🔴 **This is why an obfs4 handshake looks like random bytes.** A Curve25519
|
||||
* public key on the wire is recognisable; its *representative* is not. Get this
|
||||
* subtly wrong and nothing fails — handshakes still complete, keys still agree —
|
||||
* the representatives are merely not quite uniform, which is exactly what an
|
||||
* entropy test looks for. There is no runtime symptom, so the only defence is
|
||||
* agreeing with the reference byte for byte on inputs neither side chose. See
|
||||
* `Elligator2Test`, which runs the same vectors the Swift port does.
|
||||
*
|
||||
* ⚠️ **Built on BouncyCastle's `X25519Field`, not on hand-written arithmetic.**
|
||||
* The Swift port had to write its own field because CryptoKit exposes nothing
|
||||
* below X25519; the JVM does not have that hole, and taking a vetted
|
||||
* constant-time implementation over rolling one is the same call `:engine`
|
||||
* already made for Ed25519.
|
||||
*
|
||||
* ⚠️ The two ports therefore share no code — only vectors. That is the point:
|
||||
* two independent implementations agreeing with the same reference is a
|
||||
* stronger statement than one implementation agreeing with itself twice.
|
||||
*/
|
||||
object Elligator2 {
|
||||
|
||||
/** The Montgomery curve constant, A = 486662. */
|
||||
private val A: IntArray = X25519Field.create().also {
|
||||
it[0] = 486662
|
||||
}
|
||||
|
||||
private val negA: IntArray = X25519Field.create().also { X25519Field.negate(A, it) }
|
||||
|
||||
/** −2, the "non-square" the inverse map is built around. */
|
||||
private val negTwo: IntArray = X25519Field.create().also {
|
||||
val two = X25519Field.create(); two[0] = 2
|
||||
X25519Field.negate(two, it)
|
||||
}
|
||||
|
||||
private fun fe(bytes: ByteArray): IntArray {
|
||||
require(bytes.size == 32) { "a field element is 32 bytes" }
|
||||
val z = X25519Field.create()
|
||||
X25519Field.decode(bytes, 0, z)
|
||||
return z
|
||||
}
|
||||
|
||||
private fun encode(z: IntArray): ByteArray {
|
||||
val out = ByteArray(32)
|
||||
val copy = z.copyOf()
|
||||
X25519Field.normalize(copy)
|
||||
X25519Field.encode(copy, out, 0)
|
||||
return out
|
||||
}
|
||||
|
||||
/** The low bit of the canonical representative — Elligator's sign. */
|
||||
private fun isNegative(z: IntArray): Boolean = (encode(z)[0].toInt() and 1) == 1
|
||||
|
||||
/** √−1 mod p. */
|
||||
private val SQRT_M1: IntArray = fe(
|
||||
byteArrayOf(
|
||||
0xb0.toByte(), 0xa0.toByte(), 0x0e, 0x4a, 0x27, 0x1b, 0xee.toByte(), 0xc4.toByte(),
|
||||
0x78, 0xe4.toByte(), 0x2f, 0xad.toByte(), 0x06, 0x18, 0x43, 0x2f,
|
||||
0xa7.toByte(), 0xd7.toByte(), 0xfb.toByte(), 0x3d, 0x99.toByte(), 0x00, 0x4d, 0x2b,
|
||||
0x0b, 0xdf.toByte(), 0xc1.toByte(), 0x4f, 0x80.toByte(), 0x24, 0x83.toByte(), 0x2b,
|
||||
)
|
||||
)
|
||||
|
||||
/** x^((p−5)/8), the ladder every square root here is built on. */
|
||||
private fun powP58(x: IntArray): IntArray {
|
||||
fun sqrN(a: IntArray, n: Int): IntArray =
|
||||
X25519Field.create().also { X25519Field.sqr(a, n, it) }
|
||||
fun mul(a: IntArray, b: IntArray): IntArray =
|
||||
X25519Field.create().also { X25519Field.mul(a, b, it) }
|
||||
|
||||
val z2 = sqrN(x, 1)
|
||||
val z8 = sqrN(z2, 2)
|
||||
val z9 = mul(x, z8)
|
||||
val z11 = mul(z2, z9)
|
||||
val z22 = sqrN(z11, 1)
|
||||
val z5 = mul(z9, z22)
|
||||
val z10 = mul(sqrN(z5, 5), z5)
|
||||
val z20 = mul(sqrN(z10, 10), z10)
|
||||
val z40 = mul(sqrN(z20, 20), z20)
|
||||
val z50 = mul(sqrN(z40, 10), z10)
|
||||
val z100 = mul(sqrN(z50, 50), z50)
|
||||
val z200 = mul(sqrN(z100, 100), z100)
|
||||
val z250 = mul(sqrN(z200, 50), z50)
|
||||
return mul(sqrN(z250, 2), x)
|
||||
}
|
||||
|
||||
/** `bit == 1 ? a : b`, with no branch and no data-dependent access. */
|
||||
private fun cselect(a: IntArray, b: IntArray, bit: Int): IntArray {
|
||||
val mask = -(bit and 1) // 0 or -1, i.e. all bits
|
||||
return IntArray(a.size) { (a[it] and mask) or (b[it] and mask.inv()) }
|
||||
}
|
||||
|
||||
private fun equal(a: IntArray, b: IntArray): Boolean {
|
||||
val x = a.copyOf(); val y = b.copyOf()
|
||||
X25519Field.normalize(x); X25519Field.normalize(y)
|
||||
return X25519Field.areEqualVar(x, y)
|
||||
}
|
||||
|
||||
/**
|
||||
* √(u/v), and whether the ratio was actually square.
|
||||
*
|
||||
* 🔴 **Written out rather than delegated to `X25519Field.sqrtRatioVar`,
|
||||
* which is not a drop-in.** Elligator needs the root *even when the ratio
|
||||
* is not square* — it is √(i·u/v) then, and the algorithm uses it to pick a
|
||||
* branch rather than to detect an error. BouncyCastle only promises a
|
||||
* usable root in the square case. Handing its output to the map produced
|
||||
* zeros for 120 of 256 vectors: half-right, entirely useless, and exactly
|
||||
* the kind of thing that looks like a working implementation.
|
||||
*
|
||||
* ⚠️ The arithmetic underneath is still BouncyCastle's. What is written
|
||||
* here is the exponent chain and the branch selection, not field ops.
|
||||
*
|
||||
* ⚠️ Canonicalised to the non-negative root: ±r map to the same point, so
|
||||
* no round-trip test would catch the sign being left to chance.
|
||||
*/
|
||||
private fun sqrtRatio(u: IntArray, v: IntArray): Pair<IntArray, Boolean> {
|
||||
fun mul(a: IntArray, b: IntArray): IntArray =
|
||||
X25519Field.create().also { X25519Field.mul(a, b, it) }
|
||||
|
||||
val v3 = mul(X25519Field.create().also { X25519Field.sqr(v, it) }, v)
|
||||
val v7 = mul(X25519Field.create().also { X25519Field.sqr(v3, it) }, v)
|
||||
var r = mul(mul(u, v3), powP58(mul(u, v7)))
|
||||
|
||||
val check = mul(v, X25519Field.create().also { X25519Field.sqr(r, it) })
|
||||
val uNeg = X25519Field.create().also { X25519Field.negate(u, it) }
|
||||
|
||||
val correct = equal(check, u)
|
||||
val flipped = equal(check, uNeg)
|
||||
val flippedI = equal(check, mul(uNeg, SQRT_M1))
|
||||
|
||||
if (flipped || flippedI) r = mul(r, SQRT_M1)
|
||||
if (isNegative(r)) X25519Field.negate(r, r)
|
||||
return r to (correct || flipped)
|
||||
}
|
||||
|
||||
// MARK: - The direct map
|
||||
|
||||
/**
|
||||
* A representative to the Montgomery `u` — a public key.
|
||||
*
|
||||
* ⚠️ **The top two bits of a representative are not data.** obfs4 encodes a
|
||||
* representative in 254 bits and fills the rest with noise, so they are
|
||||
* masked off here. Feeding the raw 32 bytes in produces a different point
|
||||
* and a handshake that fails for no visible reason.
|
||||
*/
|
||||
fun publicKeyFromRepresentative(representative: ByteArray): ByteArray {
|
||||
require(representative.size == 32) { "a representative is 32 bytes" }
|
||||
val clamped = representative.copyOf()
|
||||
clamped[31] = (clamped[31].toInt() and 63).toByte()
|
||||
return encode(montgomeryFlavor(fe(clamped)).first)
|
||||
}
|
||||
|
||||
/** `MontgomeryFlavor`: representative → (u, v). */
|
||||
private fun montgomeryFlavor(r: IntArray): Pair<IntArray, IntArray> {
|
||||
val one = X25519Field.create(); X25519Field.one(one)
|
||||
|
||||
val t1 = X25519Field.create()
|
||||
X25519Field.sqr(r, t1)
|
||||
X25519Field.add(t1, t1, t1) // 2r²
|
||||
|
||||
val u = X25519Field.create()
|
||||
X25519Field.add(t1, one, u) // 2r² + 1
|
||||
|
||||
val t2 = X25519Field.create()
|
||||
X25519Field.sqr(u, t2)
|
||||
|
||||
// numerator
|
||||
val t3 = X25519Field.create()
|
||||
val aSquared = X25519Field.create()
|
||||
X25519Field.sqr(A, aSquared)
|
||||
X25519Field.mul(aSquared, t1, t3)
|
||||
X25519Field.sub(t3, t2, t3)
|
||||
X25519Field.mul(t3, A, t3)
|
||||
|
||||
// denominator
|
||||
val denominator = X25519Field.create()
|
||||
X25519Field.mul(t2, u, denominator)
|
||||
X25519Field.mul(denominator, t3, denominator)
|
||||
|
||||
// 🔴 **The root replaces the denominator from here on.** Both reference
|
||||
// implementations write the result back over the argument
|
||||
// (`invsqrt(t3, t3)`, `t1.SqrtRatio(ONE, t1)`), so every later line
|
||||
// means √(1/denominator), not the denominator. Reading it the other way
|
||||
// gave the Swift port 256 wrong answers out of 256, each a
|
||||
// plausible-looking 32 bytes.
|
||||
val (root, isSquare) = sqrtRatio(one, denominator)
|
||||
|
||||
val uOut = X25519Field.create()
|
||||
val vOut = X25519Field.create()
|
||||
if (isSquare) {
|
||||
X25519Field.one(uOut)
|
||||
X25519Field.one(vOut)
|
||||
} else {
|
||||
X25519Field.sqr(r, uOut)
|
||||
X25519Field.mul(uOut, U_FACTOR, uOut)
|
||||
X25519Field.mul(r, V_FACTOR, vOut)
|
||||
}
|
||||
|
||||
X25519Field.mul(vOut, t3, vOut)
|
||||
X25519Field.mul(vOut, root, vOut)
|
||||
|
||||
val rootSquared = X25519Field.create()
|
||||
X25519Field.sqr(root, rootSquared)
|
||||
|
||||
X25519Field.mul(uOut, negA, uOut)
|
||||
X25519Field.mul(uOut, t3, uOut)
|
||||
X25519Field.mul(uOut, t2, uOut)
|
||||
X25519Field.mul(uOut, rootSquared, uOut)
|
||||
|
||||
// ⚠️ The sign is chosen AGAINST `isSquare`: negate exactly when the two
|
||||
// disagree. Reading this as "negate when not square" is the easy
|
||||
// misreading and gives the wrong point half the time.
|
||||
if (isSquare != isNegative(vOut)) X25519Field.negate(vOut, vOut)
|
||||
return uOut to vOut
|
||||
}
|
||||
|
||||
// MARK: - The inverse map
|
||||
|
||||
/**
|
||||
* A public key and a tweak byte to a uniform representative, or `null`.
|
||||
*
|
||||
* 🔴 **`null` is the normal case, not an error.** Only about half of all
|
||||
* Curve25519 points have a representative; obfs4 discards the keypair and
|
||||
* generates another. An implementation that always succeeds is as broken as
|
||||
* one that computes the wrong bytes, and rather harder to notice.
|
||||
*/
|
||||
fun representativeForPublicKey(publicKey: ByteArray, tweak: Int): ByteArray? {
|
||||
require(publicKey.size == 32) { "a public key is 32 bytes" }
|
||||
val u = fe(publicKey)
|
||||
val one = X25519Field.create(); X25519Field.one(one)
|
||||
|
||||
val uPlusA = X25519Field.create()
|
||||
X25519Field.add(u, A, uPlusA)
|
||||
|
||||
val t3 = X25519Field.create()
|
||||
X25519Field.mul(u, uPlusA, t3)
|
||||
X25519Field.mul(t3, negTwo, t3) // −2·u·(u+A)
|
||||
|
||||
val (isr, isSquare) = sqrtRatio(one, t3)
|
||||
// ⚠️ The one variable-time branch, and it is deliberate: Monocypher
|
||||
// makes the same call and explains why. It reveals only how many tries
|
||||
// it took to find a representable key, which is safe as long as keys
|
||||
// are tried at random.
|
||||
if (!isSquare) return null
|
||||
|
||||
// Multiply by u if v is positive, by u+A otherwise. Constant-time,
|
||||
// because the tweak comes off the same keystream as the private key.
|
||||
//
|
||||
// 🔴 **Not `X25519Field.cmov`, which silently did nothing here.**
|
||||
// Passing `1` as its condition left the destination untouched, so both
|
||||
// tweak parities produced the *same* representative — a map that still
|
||||
// round-trips, still looks uniform, and only ever emits one of the two
|
||||
// valid answers. It took a diagnostic printing both candidates to see
|
||||
// it; the failing assertion said only "wrong bytes". Building the mask
|
||||
// here makes the convention explicit instead of assumed.
|
||||
val chosen = cselect(uPlusA, u, tweak and 1)
|
||||
|
||||
val result = X25519Field.create()
|
||||
X25519Field.mul(chosen, isr, result)
|
||||
|
||||
// ⚠️ Canonical sign: negate so that 2·result is even, pinning it to the
|
||||
// lower half of the field. That is also what keeps a representative
|
||||
// inside 254 bits, so the direct map's mask does not destroy it.
|
||||
val doubled = X25519Field.create()
|
||||
X25519Field.add(result, result, doubled)
|
||||
X25519Field.cnegate(if (isNegative(doubled)) 1 else 0, result)
|
||||
|
||||
val out = encode(result)
|
||||
// Two bits of noise, so a representative fills 256 bits and not 254.
|
||||
out[31] = (out[31].toInt() or (tweak and 0xc0)).toByte()
|
||||
return out
|
||||
}
|
||||
|
||||
private val U_FACTOR: IntArray = fe(
|
||||
byteArrayOf(
|
||||
0x8d.toByte(), 0xbe.toByte(), 0xe2.toByte(), 0x6b, 0xb1.toByte(), 0xc9.toByte(), 0x23, 0x76,
|
||||
0x0e, 0x37, 0xa0.toByte(), 0xa5.toByte(), 0xf2.toByte(), 0xcf.toByte(), 0x79, 0xa1.toByte(),
|
||||
0xb1.toByte(), 0x50, 0x08, 0x84.toByte(), 0xcd.toByte(), 0xfe.toByte(), 0x65, 0xa9.toByte(),
|
||||
0xe9.toByte(), 0x41, 0x7c, 0x60, 0xff.toByte(), 0xb6.toByte(), 0xf9.toByte(), 0x28,
|
||||
)
|
||||
)
|
||||
|
||||
private val V_FACTOR: IntArray = fe(
|
||||
byteArrayOf(
|
||||
0x3e, 0x5f, 0xf1.toByte(), 0xb5.toByte(), 0xd8.toByte(), 0xe4.toByte(), 0x11, 0x3b,
|
||||
0x87.toByte(), 0x1b, 0xd0.toByte(), 0x52, 0xf9.toByte(), 0xe7.toByte(), 0xbc.toByte(), 0xd0.toByte(),
|
||||
0x58, 0x28, 0x04, 0xc2.toByte(), 0x66, 0xff.toByte(), 0xb2.toByte(), 0xd4.toByte(),
|
||||
0xf4.toByte(), 0x20, 0x3e, 0xb0.toByte(), 0x7f, 0xdb.toByte(), 0x7c, 0x54,
|
||||
)
|
||||
)
|
||||
}
|
||||
@@ -0,0 +1,166 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.bouncycastle.crypto.engines.XSalsa20Engine
|
||||
import org.bouncycastle.crypto.macs.Poly1305
|
||||
import org.bouncycastle.crypto.params.KeyParameter
|
||||
import org.bouncycastle.crypto.params.ParametersWithIV
|
||||
|
||||
/**
|
||||
* NaCl `crypto_secretbox` — XSalsa20-Poly1305 — and obfs4's link framing.
|
||||
*
|
||||
* ⚠️ **XSalsa20 and Poly1305 both come from BouncyCastle here.** The Swift port
|
||||
* hand-writes both because CryptoKit's AEADs are AES-GCM and ChaChaPoly and it
|
||||
* exposes neither primitive. Poly1305 in particular is a MAC, so a bug in it is
|
||||
* a forgery rather than a wrong answer — taking a vetted implementation is the
|
||||
* right call wherever one exists.
|
||||
*/
|
||||
object Secretbox {
|
||||
|
||||
const val OVERHEAD = 16
|
||||
|
||||
/**
|
||||
* 🔴 **The first 32 bytes of the keystream are the Poly1305 key, and the
|
||||
* message starts at stream offset 32.** Encrypting from offset 0 produces a
|
||||
* ciphertext that decrypts perfectly against itself and against nothing
|
||||
* else. Prefixing 32 zero bytes and slicing is the same computation written
|
||||
* so the offset cannot be forgotten.
|
||||
*/
|
||||
fun seal(message: ByteArray, nonce: ByteArray, key: ByteArray): ByteArray {
|
||||
require(nonce.size == 24 && key.size == 32)
|
||||
val stream = keystream(ByteArray(32) + message, nonce, key)
|
||||
val polyKey = stream.copyOfRange(0, 32)
|
||||
val ciphertext = stream.copyOfRange(32, stream.size)
|
||||
return mac(polyKey, ciphertext) + ciphertext
|
||||
}
|
||||
|
||||
/** `null` on a tag mismatch — which is fatal, never retried. */
|
||||
fun open(box: ByteArray, nonce: ByteArray, key: ByteArray): ByteArray? {
|
||||
require(nonce.size == 24 && key.size == 32)
|
||||
if (box.size < OVERHEAD) return null
|
||||
val tag = box.copyOfRange(0, OVERHEAD)
|
||||
val ciphertext = box.copyOfRange(OVERHEAD, box.size)
|
||||
|
||||
val stream = keystream(ByteArray(32) + ciphertext, nonce, key)
|
||||
val polyKey = stream.copyOfRange(0, 32)
|
||||
|
||||
// 🔴 Authenticate BEFORE returning any plaintext. The stream is computed
|
||||
// either way, but nothing derived from it may escape until the tag
|
||||
// checks out.
|
||||
if (!constantTimeEquals(tag, mac(polyKey, ciphertext))) return null
|
||||
return stream.copyOfRange(32, stream.size)
|
||||
}
|
||||
|
||||
private fun keystream(input: ByteArray, nonce: ByteArray, key: ByteArray): ByteArray {
|
||||
val engine = XSalsa20Engine()
|
||||
engine.init(true, ParametersWithIV(KeyParameter(key), nonce))
|
||||
return ByteArray(input.size).also { engine.processBytes(input, 0, input.size, it, 0) }
|
||||
}
|
||||
|
||||
private fun mac(key: ByteArray, message: ByteArray): ByteArray {
|
||||
val poly = Poly1305()
|
||||
poly.init(KeyParameter(key))
|
||||
poly.update(message, 0, message.size)
|
||||
return ByteArray(16).also { poly.doFinal(it, 0) }
|
||||
}
|
||||
|
||||
fun constantTimeEquals(a: ByteArray, b: ByteArray): Boolean {
|
||||
if (a.size != b.size) return false
|
||||
var diff = 0
|
||||
for (i in a.indices) diff = diff or (a[i].toInt() xor b[i].toInt())
|
||||
return diff == 0
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* obfs4 link framing: a two-byte obfuscated length followed by a secretbox.
|
||||
*
|
||||
* 🔴 **The nonce is never transmitted.** It is a fixed 16-byte prefix from the
|
||||
* key plus a big-endian 64-bit counter that **starts at 1** and increments per
|
||||
* frame. Both sides track it independently, so a frame processed out of order,
|
||||
* twice, or not at all desynchronises the connection permanently — and the
|
||||
* symptom is a Poly1305 failure on the *next* frame, not the one at fault.
|
||||
*
|
||||
* ⚠️ Starting the counter at 0 interoperates with nothing, and is also how the
|
||||
* wraparound check works: the reference treats 0 as "wrapped" precisely because
|
||||
* it can never legitimately be 0.
|
||||
*/
|
||||
class FrameEncoder(key: ByteArray) {
|
||||
private val boxKey = key.copyOfRange(0, 32)
|
||||
private val noncePrefix = key.copyOfRange(32, 48)
|
||||
private val drbg = LengthDrbg(key.copyOfRange(48, 72))
|
||||
private var counter = 1L
|
||||
|
||||
init { require(key.size == KEY_LENGTH) { "the framing key is $KEY_LENGTH bytes" } }
|
||||
|
||||
class PayloadTooLong(val length: Int) : Exception("payload too long: $length")
|
||||
class NonceCounterWrapped : Exception("the nonce counter wrapped — fatal")
|
||||
|
||||
fun encode(payload: ByteArray): ByteArray {
|
||||
if (payload.size > MAX_PAYLOAD_LENGTH) throw PayloadTooLong(payload.size)
|
||||
if (counter == 0L) throw NonceCounterWrapped()
|
||||
|
||||
val nonce = noncePrefix + ByteArray(8) { ((counter ushr (8 * (7 - it))) and 0xff).toByte() }
|
||||
counter++
|
||||
|
||||
val box = Secretbox.seal(payload, nonce, boxKey)
|
||||
val masked = (box.size xor drbg.nextLengthMask()) and 0xffff
|
||||
return byteArrayOf((masked shr 8).toByte(), masked.toByte()) + box
|
||||
}
|
||||
|
||||
companion object {
|
||||
const val KEY_LENGTH = 72 // 32 box key ‖ 16 nonce prefix ‖ 24 DRBG seed
|
||||
const val OVERHEAD = 2 + Secretbox.OVERHEAD
|
||||
const val MAX_SEGMENT_LENGTH = 1448
|
||||
const val MAX_PAYLOAD_LENGTH = MAX_SEGMENT_LENGTH - OVERHEAD
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* The other half. Separate because the two directions of a connection use
|
||||
* different keys and must never share DRBG or counter state.
|
||||
*/
|
||||
class FrameDecoder(key: ByteArray) {
|
||||
private val boxKey = key.copyOfRange(0, 32)
|
||||
private val noncePrefix = key.copyOfRange(32, 48)
|
||||
private val drbg = LengthDrbg(key.copyOfRange(48, 72))
|
||||
private var counter = 1L
|
||||
private var pendingLength: Int? = null
|
||||
|
||||
init { require(key.size == FrameEncoder.KEY_LENGTH) }
|
||||
|
||||
class NeedMoreData : Exception("more data needed")
|
||||
class TagMismatch : Exception("Poly1305 tag mismatch — fatal")
|
||||
class InvalidLength(val length: Int) : Exception("invalid frame length: $length")
|
||||
|
||||
/**
|
||||
* Consumes one whole frame from `buffer`, removing it.
|
||||
*
|
||||
* ⚠️ **The length must be unmasked exactly once per frame.** The DRBG
|
||||
* advances when read, so peeking at the length twice — say, on a short read
|
||||
* that is retried — desynchronises the stream. The unmasked length is
|
||||
* therefore remembered until its frame is consumed.
|
||||
*/
|
||||
fun decode(buffer: MutableList<Byte>): ByteArray {
|
||||
if (pendingLength == null) {
|
||||
if (buffer.size < 2) throw NeedMoreData()
|
||||
val masked = ((buffer[0].toInt() and 0xff) shl 8) or (buffer[1].toInt() and 0xff)
|
||||
buffer.subList(0, 2).clear()
|
||||
val length = masked xor drbg.nextLengthMask()
|
||||
if (length < Secretbox.OVERHEAD || length > FrameEncoder.MAX_SEGMENT_LENGTH - 2) {
|
||||
throw InvalidLength(length)
|
||||
}
|
||||
pendingLength = length
|
||||
}
|
||||
val length = pendingLength!!
|
||||
if (buffer.size < length) throw NeedMoreData()
|
||||
|
||||
val nonce = noncePrefix + ByteArray(8) { ((counter ushr (8 * (7 - it))) and 0xff).toByte() }
|
||||
val box = ByteArray(length) { buffer[it] }
|
||||
val payload = Secretbox.open(box, nonce, boxKey) ?: throw TagMismatch()
|
||||
|
||||
buffer.subList(0, length).clear()
|
||||
counter++
|
||||
pendingLength = null
|
||||
return payload
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,171 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import java.security.SecureRandom
|
||||
|
||||
/**
|
||||
* Go's `math/rand` semantics, driven by obfs4's SipHash DRBG.
|
||||
*
|
||||
* 🔴 **This exists for indistinguishability, not interoperability.** Padding is
|
||||
* padding — a peer reads the declared payload length and ignores the rest, so
|
||||
* *any* distribution talks to a real bridge. But obfs4's purpose is to look like
|
||||
* other obfs4 traffic, and packet length is among the first things a censor
|
||||
* would model. A port that pads differently works perfectly and is
|
||||
* fingerprintable, which is the more dangerous kind of wrong.
|
||||
*
|
||||
* ⚠️ **These are Go's algorithms, quirks included.** `float64` divides an
|
||||
* `int63` by 2^63 and resamples on the one-in-2^53 chance it rounds to 1.0 —
|
||||
* Go's own comment says a cleaner form exists and was rejected to preserve the
|
||||
* value stream. `perm` swaps `m[0]` with itself on its first iteration for the
|
||||
* same reason. Both quirks consume randomness, so "improving" either
|
||||
* desynchronises every draw that follows.
|
||||
*/
|
||||
class GoRandom(seed: ByteArray) {
|
||||
private val drbg = LengthDrbg(seed)
|
||||
|
||||
/** The DRBG block, big-endian, with the sign bit cleared. */
|
||||
fun int63(): Long {
|
||||
val block = drbg.nextBlock()
|
||||
var v = 0L
|
||||
for (b in block) v = (v shl 8) or (b.toLong() and 0xff)
|
||||
return v and Long.MAX_VALUE
|
||||
}
|
||||
|
||||
private fun int31(): Int = (int63() ushr 32).toInt()
|
||||
|
||||
/**
|
||||
* ⚠️ Rejection sampling, exactly as Go does it. A simple `% n` would be
|
||||
* biased *and* would consume a different number of draws.
|
||||
*/
|
||||
private fun int31n(n: Int): Int {
|
||||
require(n > 0)
|
||||
if (n and (n - 1) == 0) return int31() and (n - 1) // power of two
|
||||
val max = ((1L shl 31) - 1 - (1L shl 31) % n).toInt()
|
||||
var v = int31()
|
||||
while (v > max) v = int31()
|
||||
return v % n
|
||||
}
|
||||
|
||||
fun intn(n: Int): Int {
|
||||
require(n > 0) { "Intn requires a positive bound" }
|
||||
return int31n(n)
|
||||
}
|
||||
|
||||
fun float64(): Double {
|
||||
while (true) {
|
||||
val f = int63().toDouble() / 9.223372036854776E18 // 2^63
|
||||
if (f != 1.0) return f
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ Starts at 0, so the first iteration swaps `m[0]` with itself. Useless
|
||||
* work that consumes a draw — and removing it changes every later value.
|
||||
*/
|
||||
fun perm(n: Int): IntArray {
|
||||
val m = IntArray(n)
|
||||
for (i in 0 until n) {
|
||||
val j = intn(i + 1)
|
||||
m[i] = m[j]
|
||||
m[j] = i
|
||||
}
|
||||
return m
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* obfs4's packet-length distribution: a weighted sample over a subset of
|
||||
* lengths, derived from a seed.
|
||||
*
|
||||
* ⚠️ **The server sends its seed to the client inside the connection**, so both
|
||||
* ends pad from the same distribution. That is why the derivation must match
|
||||
* lyrebird's exactly even though sampling need not.
|
||||
*
|
||||
* 🔴 **Sampling draws from the system CSPRNG, not the seed.** The reference is
|
||||
* explicit about this, and it matters: a seeded sampler would make one
|
||||
* connection's padding predictable from another's.
|
||||
*/
|
||||
class WeightedDist(seed: ByteArray, val minValue: Int, val maxValue: Int, val biased: Boolean) {
|
||||
var values: IntArray = IntArray(0); private set
|
||||
var weights: DoubleArray = DoubleArray(0); private set
|
||||
private var prob: DoubleArray = DoubleArray(0)
|
||||
private var alias: IntArray = IntArray(0)
|
||||
private val random = SecureRandom()
|
||||
|
||||
init {
|
||||
require(maxValue > minValue) { "an empty distribution has nothing to sample" }
|
||||
reset(seed)
|
||||
}
|
||||
|
||||
fun reset(seed: ByteArray) {
|
||||
val rng = GoRandom(seed)
|
||||
genValues(rng)
|
||||
if (biased) genBiasedWeights(rng) else genUniformWeights(rng)
|
||||
genTables()
|
||||
}
|
||||
|
||||
private fun genValues(rng: GoRandom) {
|
||||
var nValues = (maxValue + 1) - minValue
|
||||
val permuted = rng.perm(nValues)
|
||||
// ⚠️ The clamp happens AFTER the full permutation is drawn. Permuting
|
||||
// only the clamped count consumes far less randomness and every later
|
||||
// draw would differ.
|
||||
nValues = maxOf(nValues, MIN_VALUES)
|
||||
nValues = minOf(nValues, MAX_VALUES)
|
||||
nValues = rng.intn(nValues) + 1
|
||||
values = permuted.copyOfRange(0, nValues)
|
||||
}
|
||||
|
||||
private fun genBiasedWeights(rng: GoRandom) {
|
||||
weights = DoubleArray(values.size)
|
||||
var culmProb = 0.0
|
||||
for (i in values.indices) {
|
||||
val p = (1.0 - culmProb) * rng.float64()
|
||||
weights[i] = p
|
||||
culmProb += p
|
||||
}
|
||||
}
|
||||
|
||||
private fun genUniformWeights(rng: GoRandom) {
|
||||
weights = DoubleArray(values.size) { rng.float64() }
|
||||
}
|
||||
|
||||
/**
|
||||
* Vose's alias method, in the reference's exact form — including that
|
||||
* leftovers in `large` are assigned before leftovers in `small`.
|
||||
*/
|
||||
private fun genTables() {
|
||||
val n = weights.size
|
||||
val sum = weights.sum()
|
||||
val aliasTable = IntArray(n)
|
||||
val probTable = DoubleArray(n)
|
||||
val scaled = DoubleArray(n) { weights[it] * n / sum }
|
||||
val small = ArrayDeque<Int>()
|
||||
val large = ArrayDeque<Int>()
|
||||
for (i in 0 until n) if (scaled[i] < 1.0) small.addLast(i) else large.addLast(i)
|
||||
|
||||
while (small.isNotEmpty() && large.isNotEmpty()) {
|
||||
val l = small.removeFirst()
|
||||
val g = large.removeFirst()
|
||||
probTable[l] = scaled[l]
|
||||
aliasTable[l] = g
|
||||
scaled[g] = (scaled[g] + scaled[l]) - 1.0
|
||||
if (scaled[g] < 1.0) small.addLast(g) else large.addLast(g)
|
||||
}
|
||||
for (g in large) probTable[g] = 1.0
|
||||
for (l in small) probTable[l] = 1.0
|
||||
prob = probTable
|
||||
alias = aliasTable
|
||||
}
|
||||
|
||||
/** 🔴 Draws from the system CSPRNG deliberately — see the class comment. */
|
||||
fun sample(): Int {
|
||||
val i = random.nextInt(values.size)
|
||||
val idx = if (random.nextDouble() <= prob[i]) i else alias[i]
|
||||
return minValue + values[idx]
|
||||
}
|
||||
|
||||
companion object {
|
||||
private const val MIN_VALUES = 1
|
||||
private const val MAX_VALUES = 100
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,211 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import javax.crypto.Mac
|
||||
import javax.crypto.spec.SecretKeySpec
|
||||
|
||||
/**
|
||||
* The obfs4 handshake messages.
|
||||
*
|
||||
* client → server: X ‖ P_C ‖ M_C ‖ MAC(X ‖ P_C ‖ M_C ‖ E)
|
||||
* server → client: Y ‖ AUTH ‖ P_S ‖ M_S ‖ MAC(Y ‖ AUTH ‖ P_S ‖ M_S ‖ E)
|
||||
*
|
||||
* where `X`/`Y` are Elligator2 representatives, `P` is random padding, `M` is a
|
||||
* 16-byte mark, `E` is the hours since the Unix epoch **as a decimal string**,
|
||||
* and the MAC key is `serverIdentityPublic ‖ nodeId`.
|
||||
*
|
||||
* 🔴 **This layer is what makes obfs4 probe-resistant.** A scanner that connects
|
||||
* and sends anything cannot produce a valid mark without the bridge's public
|
||||
* key, so the server never answers — it just waits, exactly like a service that
|
||||
* is not there. Every rejection path here must stay silent to the *peer*:
|
||||
* returning an error to the caller is right, writing anything back is not.
|
||||
*/
|
||||
object Obfs4Handshake {
|
||||
|
||||
const val MARK_LENGTH = 16
|
||||
const val MAC_LENGTH = 16
|
||||
const val MAX_HANDSHAKE_LENGTH = 8192
|
||||
private const val REPRESENTATIVE_LENGTH = 32
|
||||
private const val AUTH_LENGTH = 32
|
||||
|
||||
const val CLIENT_MIN_HANDSHAKE_LENGTH = REPRESENTATIVE_LENGTH + MARK_LENGTH + MAC_LENGTH
|
||||
const val SERVER_MIN_HANDSHAKE_LENGTH =
|
||||
REPRESENTATIVE_LENGTH + AUTH_LENGTH + MARK_LENGTH + MAC_LENGTH
|
||||
|
||||
/**
|
||||
* The server's first frame carries a DRBG seed inline, and the client's
|
||||
* padding floor is sized so a client handshake is never shorter than a
|
||||
* server one — otherwise the two directions are distinguishable by length
|
||||
* alone.
|
||||
*/
|
||||
const val INLINE_SEED_FRAME_LENGTH = FrameEncoder.OVERHEAD + 3 + 24
|
||||
|
||||
const val CLIENT_MIN_PAD_LENGTH =
|
||||
(SERVER_MIN_HANDSHAKE_LENGTH + INLINE_SEED_FRAME_LENGTH) - CLIENT_MIN_HANDSHAKE_LENGTH
|
||||
const val CLIENT_MAX_PAD_LENGTH = MAX_HANDSHAKE_LENGTH - CLIENT_MIN_HANDSHAKE_LENGTH
|
||||
const val SERVER_MIN_PAD_LENGTH = 0
|
||||
const val SERVER_MAX_PAD_LENGTH =
|
||||
MAX_HANDSHAKE_LENGTH - (SERVER_MIN_HANDSHAKE_LENGTH + INLINE_SEED_FRAME_LENGTH)
|
||||
|
||||
/**
|
||||
* The MAC key: the server's identity **public** key then the node id. Both
|
||||
* are public, which is the point — a client holding the bridge line can
|
||||
* compute marks, and a scanner that does not, cannot.
|
||||
*/
|
||||
fun macKey(serverIdentityPublic: ByteArray, nodeId: ByteArray): ByteArray =
|
||||
serverIdentityPublic + nodeId
|
||||
|
||||
private fun hmac128(key: ByteArray, vararg parts: ByteArray): ByteArray {
|
||||
val mac = Mac.getInstance("HmacSHA256")
|
||||
mac.init(SecretKeySpec(key, "HmacSHA256"))
|
||||
for (p in parts) mac.update(p)
|
||||
return mac.doFinal().copyOfRange(0, 16)
|
||||
}
|
||||
|
||||
fun mark(macKey: ByteArray, representative: ByteArray): ByteArray =
|
||||
hmac128(macKey, representative)
|
||||
|
||||
/**
|
||||
* ⚠️ The epoch hour enters the MAC as its **decimal string**, not as bytes.
|
||||
* `496862` is six ASCII characters here; a binary encoding produces a MAC
|
||||
* that is self-consistent and interoperates with nothing.
|
||||
*/
|
||||
private fun epochBytes(hour: Long): ByteArray = hour.toString().toByteArray()
|
||||
|
||||
/**
|
||||
* 🔴 Everything below takes the hour as a **parameter**. A MAC that silently
|
||||
* depends on the wall clock cannot be tested against a recorded handshake,
|
||||
* because the recording rots within the hour.
|
||||
*/
|
||||
fun currentEpochHour(nowMillis: Long = System.currentTimeMillis()): Long =
|
||||
nowMillis / 1000 / 3600
|
||||
|
||||
fun clientMessage(
|
||||
representative: ByteArray, padding: ByteArray, macKey: ByteArray, epochHour: Long,
|
||||
): ByteArray {
|
||||
val prefix = representative + padding + mark(macKey, representative)
|
||||
return prefix + hmac128(macKey, prefix, epochBytes(epochHour))
|
||||
}
|
||||
|
||||
fun serverMessage(
|
||||
representative: ByteArray, auth: ByteArray, padding: ByteArray,
|
||||
macKey: ByteArray, epochHour: Long,
|
||||
): ByteArray {
|
||||
val prefix = representative + auth + padding + mark(macKey, representative)
|
||||
return prefix + hmac128(macKey, prefix, epochBytes(epochHour))
|
||||
}
|
||||
|
||||
/** ⚠️ **Not a rejection.** The mark may simply not have arrived yet. */
|
||||
class NeedMoreData : Exception("more handshake data needed")
|
||||
class InvalidHandshake : Exception("invalid handshake")
|
||||
class MacMismatch : Exception("handshake MAC mismatch")
|
||||
|
||||
class ParsedClient(
|
||||
val representative: ByteArray,
|
||||
val padding: ByteArray,
|
||||
/** Which of hour−1, hour, hour+1 verified. The reply must echo it. */
|
||||
val epochHour: Long,
|
||||
val consumed: Int,
|
||||
/** The received MAC, which the caller must feed to a replay filter. */
|
||||
val mac: ByteArray,
|
||||
)
|
||||
|
||||
class ParsedServer(
|
||||
val representative: ByteArray,
|
||||
val auth: ByteArray,
|
||||
val padding: ByteArray,
|
||||
val consumed: Int,
|
||||
)
|
||||
|
||||
/**
|
||||
* The server's side.
|
||||
*
|
||||
* 🔴 **Searches only the tail, deliberately.** The client cannot send
|
||||
* anything valid after its MAC — it has no server ephemeral key yet — so the
|
||||
* mark must sit exactly 32 bytes from the end. Trailing bytes make the
|
||||
* handshake invalid, full stop.
|
||||
*
|
||||
* ⚠️ **All three epoch hours are evaluated even after one matches.** The
|
||||
* reference does this to flatten timing, and so does this: breaking early
|
||||
* would leak which hour a client's clock is on.
|
||||
*/
|
||||
fun parseClientMessage(buffer: ByteArray, macKey: ByteArray, epochHour: Long): ParsedClient {
|
||||
if (buffer.size < CLIENT_MIN_HANDSHAKE_LENGTH) throw NeedMoreData()
|
||||
|
||||
val representative = buffer.copyOfRange(0, REPRESENTATIVE_LENGTH)
|
||||
val expectedMark = mark(macKey, representative)
|
||||
val startPos = REPRESENTATIVE_LENGTH + CLIENT_MIN_PAD_LENGTH
|
||||
val endPos = minOf(buffer.size, MAX_HANDSHAKE_LENGTH)
|
||||
|
||||
fun giveUp(): Nothing =
|
||||
if (buffer.size >= MAX_HANDSHAKE_LENGTH) throw InvalidHandshake() else throw NeedMoreData()
|
||||
|
||||
if (endPos - startPos < MARK_LENGTH + MAC_LENGTH) giveUp()
|
||||
val pos = endPos - (MARK_LENGTH + MAC_LENGTH)
|
||||
if (!Secretbox.constantTimeEquals(buffer.copyOfRange(pos, pos + MARK_LENGTH), expectedMark)) {
|
||||
giveUp()
|
||||
}
|
||||
|
||||
val receivedMac = buffer.copyOfRange(pos + MARK_LENGTH, pos + MARK_LENGTH + MAC_LENGTH)
|
||||
var matched: Long? = null
|
||||
for (offset in listOf(0L, -1L, 1L)) {
|
||||
val hour = epochHour + offset
|
||||
val computed = hmac128(macKey, buffer.copyOfRange(0, pos + MARK_LENGTH), epochBytes(hour))
|
||||
if (Secretbox.constantTimeEquals(computed, receivedMac)) matched = hour
|
||||
}
|
||||
val hour = matched ?: throw MacMismatch()
|
||||
|
||||
// ⚠️ Kept to match the reference, though the tail search is what actually
|
||||
// rejects trailing bytes: appending moves the window and the mark stops
|
||||
// matching. This can only fire on an oversized buffer.
|
||||
if (buffer.size != pos + MARK_LENGTH + MAC_LENGTH) throw InvalidHandshake()
|
||||
|
||||
return ParsedClient(
|
||||
representative, buffer.copyOfRange(REPRESENTATIVE_LENGTH, pos),
|
||||
hour, pos + MARK_LENGTH + MAC_LENGTH, receivedMac,
|
||||
)
|
||||
}
|
||||
|
||||
/**
|
||||
* The client's side.
|
||||
*
|
||||
* ⚠️ **A substring search, not a tail check.** The server *does* send framed
|
||||
* traffic immediately after its handshake — its first data frame is usually
|
||||
* in the same segment — so the mark can be anywhere from
|
||||
* `SERVER_MIN_HANDSHAKE_LENGTH` onwards. Using the tail trick here, the
|
||||
* obvious symmetry, fails against every real bridge.
|
||||
*/
|
||||
fun parseServerMessage(buffer: ByteArray, macKey: ByteArray, epochHour: Long): ParsedServer {
|
||||
if (buffer.size < SERVER_MIN_HANDSHAKE_LENGTH) throw NeedMoreData()
|
||||
|
||||
val representative = buffer.copyOfRange(0, REPRESENTATIVE_LENGTH)
|
||||
val auth = buffer.copyOfRange(REPRESENTATIVE_LENGTH, REPRESENTATIVE_LENGTH + AUTH_LENGTH)
|
||||
val expectedMark = mark(macKey, representative)
|
||||
val startPos = REPRESENTATIVE_LENGTH + AUTH_LENGTH + SERVER_MIN_PAD_LENGTH
|
||||
val endPos = minOf(buffer.size, MAX_HANDSHAKE_LENGTH)
|
||||
|
||||
if (endPos - startPos < MARK_LENGTH + MAC_LENGTH) throw NeedMoreData()
|
||||
val pos = indexOf(expectedMark, buffer, startPos, endPos)
|
||||
if (pos < 0 || pos + MARK_LENGTH + MAC_LENGTH > endPos) {
|
||||
if (buffer.size >= MAX_HANDSHAKE_LENGTH) throw InvalidHandshake() else throw NeedMoreData()
|
||||
}
|
||||
|
||||
val receivedMac = buffer.copyOfRange(pos + MARK_LENGTH, pos + MARK_LENGTH + MAC_LENGTH)
|
||||
val computed = hmac128(macKey, buffer.copyOfRange(0, pos + MARK_LENGTH), epochBytes(epochHour))
|
||||
if (!Secretbox.constantTimeEquals(computed, receivedMac)) throw MacMismatch()
|
||||
|
||||
return ParsedServer(
|
||||
representative, auth, buffer.copyOfRange(startPos, pos),
|
||||
pos + MARK_LENGTH + MAC_LENGTH,
|
||||
)
|
||||
}
|
||||
|
||||
private fun indexOf(needle: ByteArray, haystack: ByteArray, from: Int, to: Int): Int {
|
||||
if (from < 0 || to > haystack.size || to - from < needle.size) return -1
|
||||
var i = from
|
||||
outer@ while (i <= to - needle.size) {
|
||||
for (j in needle.indices) if (haystack[i + j] != needle[j]) { i++; continue@outer }
|
||||
return i
|
||||
}
|
||||
return -1
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,190 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.bouncycastle.math.ec.rfc7748.X25519Field
|
||||
|
||||
/**
|
||||
* X25519 scalar multiplication, including the **cofactor-dirty** variant obfs4
|
||||
* uses for key generation.
|
||||
*
|
||||
* 🔴 **The dirty variant is why obfs4 public keys differ from every normal
|
||||
* X25519 implementation's.** A conventional implementation clamps the scalar,
|
||||
* clearing the cofactor and confining the result to the prime-order subgroup —
|
||||
* and a point known to be in that subgroup is *distinguishable*, which undoes
|
||||
* the whole point of Elligator2. obfs4 keeps the cofactor component so the
|
||||
* public key ranges over the full curve.
|
||||
*
|
||||
* ⚠️ **BouncyCastle's `X25519.scalarMult` cannot be used for it.** That clamps
|
||||
* internally and runs 255 bits; the dirty variant needs the *combined* scalar
|
||||
* fed to a **256-bit** ladder with no re-clamping. The field arithmetic here is
|
||||
* still BouncyCastle's — only the ladder and the scalar handling are written
|
||||
* out.
|
||||
*
|
||||
* Follows Monocypher's `crypto_x25519_dirty_small`, which decouples the
|
||||
* cofactor from the main factor and multiplies a single combined scalar by a
|
||||
* base point of order 8·L. lyrebird instead uses the Edwards route; the two
|
||||
* agree, and the vectors check that rather than taking it on faith.
|
||||
*/
|
||||
object Ladder {
|
||||
|
||||
/**
|
||||
* A base point of order 8·L, so multiplying by it leaves the cofactor
|
||||
* intact.
|
||||
*
|
||||
* ⚠️ Its low-order component is not arbitrary — it was chosen so this route
|
||||
* lands on the same public key as the Edwards route obfs4 actually uses.
|
||||
* Any other order-8 point gives a self-consistent implementation that no
|
||||
* longer interoperates.
|
||||
*/
|
||||
private val DIRTY_BASE_POINT = byteArrayOf(
|
||||
0xd8.toByte(), 0x86.toByte(), 0x1a, 0xa2.toByte(), 0x78, 0x7a, 0xd9.toByte(), 0x26,
|
||||
0x8b.toByte(), 0x74, 0x74, 0xb6.toByte(), 0x82.toByte(), 0xe3.toByte(), 0xbe.toByte(), 0xc3.toByte(),
|
||||
0xce.toByte(), 0x36, 0x9a.toByte(), 0x1e, 0x5e, 0x31, 0x47, 0xa2.toByte(),
|
||||
0x6d, 0x37, 0x7c, 0xfd.toByte(), 0x20, 0xb5.toByte(), 0xdf.toByte(), 0x75,
|
||||
)
|
||||
|
||||
private val BASE_POINT_9 = ByteArray(32).also { it[0] = 9 }
|
||||
|
||||
/** L, the order of the prime-order subgroup, as eight 32-bit words. */
|
||||
private val GROUP_ORDER = longArrayOf(
|
||||
0x5cf5d3edL, 0x5812631aL, 0xa2f79cd6L, 0x14def9deL,
|
||||
0x00000000L, 0x00000000L, 0x00000000L, 0x10000000L,
|
||||
)
|
||||
|
||||
/** The standard X25519 clamp. */
|
||||
fun trimScalar(s: ByteArray): ByteArray = s.copyOf().also {
|
||||
it[0] = (it[0].toInt() and 248).toByte()
|
||||
it[31] = (it[31].toInt() and 127).toByte()
|
||||
it[31] = (it[31].toInt() or 64).toByte()
|
||||
}
|
||||
|
||||
/**
|
||||
* Add `(x and 7)·L` to a 256-bit little-endian scalar.
|
||||
*
|
||||
* 🔴 **This is the step that puts the cofactor back.** Trimming cleared the
|
||||
* three low bits, but those bits still carry a main-factor component that
|
||||
* has to be removed for X25519 compatibility; adding `lsb·L` (mod 8·L)
|
||||
* recombines the two into one scalar. Drop it and you get an ordinary clean
|
||||
* public key — which works, agrees on shared secrets, and is exactly the
|
||||
* distinguishable thing obfs4 avoids.
|
||||
*/
|
||||
fun addGroupOrderTimes(x: Int, s: ByteArray): ByteArray {
|
||||
val out = s.copyOf()
|
||||
val mod8 = (x and 7).toLong()
|
||||
var carry = 0L
|
||||
for (i in 0 until 8) {
|
||||
var word = 0L
|
||||
for (j in 3 downTo 0) word = (word shl 8) or (out[4 * i + j].toLong() and 0xff)
|
||||
carry += word + GROUP_ORDER[i] * mod8
|
||||
for (j in 0 until 4) out[4 * i + j] = ((carry ushr (8 * j)) and 0xff).toByte()
|
||||
carry = carry ushr 32
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
/** `bit == 1` swaps `a` and `b`, without branching on the bit. */
|
||||
private fun cswap(bit: Int, a: IntArray, b: IntArray) {
|
||||
// ⚠️ An explicit mask, deliberately. `X25519Field.cmov` was found to do
|
||||
// nothing at all when handed a plain `1`, so nothing in this file
|
||||
// assumes BouncyCastle's conditional helpers take a boolean-shaped
|
||||
// condition. See Elligator2.cselect.
|
||||
val mask = -(bit and 1)
|
||||
for (i in a.indices) {
|
||||
val t = mask and (a[i] xor b[i])
|
||||
a[i] = a[i] xor t
|
||||
b[i] = b[i] xor t
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* The Montgomery ladder in projective coordinates, ref10's, via Monocypher.
|
||||
*
|
||||
* ⚠️ **`bits` is 256 for the dirty variant, not the usual 255.** The
|
||||
* combined scalar can exceed 2^255 once `lsb·L` has been added, so a ladder
|
||||
* that stops at bit 254 silently drops the top bit and returns a wrong
|
||||
* point for a fraction of keys — a bug any small sample would miss.
|
||||
*/
|
||||
fun ladder(scalar: ByteArray, base: ByteArray, bits: Int): ByteArray {
|
||||
val x1 = X25519Field.create().also { X25519Field.decode(base, 0, it) }
|
||||
val x2 = X25519Field.create().also { X25519Field.one(it) }
|
||||
val z2 = X25519Field.create()
|
||||
val x3 = x1.copyOf()
|
||||
val z3 = X25519Field.create().also { X25519Field.one(it) }
|
||||
|
||||
val t0 = X25519Field.create()
|
||||
val t1 = X25519Field.create()
|
||||
val t2 = X25519Field.create()
|
||||
|
||||
var swap = 0
|
||||
for (pos in bits - 1 downTo 0) {
|
||||
val bit = (scalar[pos shr 3].toInt() shr (pos and 7)) and 1
|
||||
swap = swap xor bit
|
||||
cswap(swap, x2, x3)
|
||||
cswap(swap, z2, z3)
|
||||
swap = bit // the xor trick: one swap deferred
|
||||
|
||||
X25519Field.sub(x3, z3, t0)
|
||||
X25519Field.sub(x2, z2, t1)
|
||||
X25519Field.add(x2, z2, x2)
|
||||
X25519Field.add(x3, z3, z2)
|
||||
X25519Field.mul(t0, x2, z3)
|
||||
X25519Field.mul(z2, t1, z2)
|
||||
X25519Field.sqr(t1, t0)
|
||||
X25519Field.sqr(x2, t1)
|
||||
X25519Field.add(z3, z2, x3)
|
||||
X25519Field.sub(z3, z2, z2)
|
||||
X25519Field.mul(t1, t0, x2)
|
||||
X25519Field.sub(t1, t0, t1)
|
||||
X25519Field.sqr(z2, z2)
|
||||
X25519Field.mul(t1, 121666, z3)
|
||||
X25519Field.sqr(x3, x3)
|
||||
X25519Field.add(t0, z3, t2)
|
||||
X25519Field.mul(x1, z2, z3)
|
||||
X25519Field.mul(t1, t2, z2)
|
||||
}
|
||||
// ⚠️ Compensates for the xor trick. Omitting it gives a result that is
|
||||
// right for exactly the scalars whose bottom bit happens to agree.
|
||||
cswap(swap, x2, x3)
|
||||
cswap(swap, z2, z3)
|
||||
|
||||
val inv = X25519Field.create().also { X25519Field.inv(z2, it) }
|
||||
val out = X25519Field.create().also { X25519Field.mul(x2, inv, it) }
|
||||
X25519Field.normalize(out)
|
||||
return ByteArray(32).also { X25519Field.encode(out, it, 0) }
|
||||
}
|
||||
|
||||
/**
|
||||
* A private key to its **cofactor-dirty** X25519 public key.
|
||||
*
|
||||
* The private key must be the full 32 bytes of entropy. Pre-clamping it
|
||||
* yields non-uniformly distributed representatives, which is the whole
|
||||
* failure this module exists to avoid.
|
||||
*/
|
||||
fun dirtyPublicKey(privateKey: ByteArray): ByteArray {
|
||||
require(privateKey.size == 32) { "a private key is 32 bytes" }
|
||||
val combined = addGroupOrderTimes(privateKey[0].toInt(), trimScalar(privateKey))
|
||||
return ladder(combined, DIRTY_BASE_POINT, 256)
|
||||
}
|
||||
|
||||
/**
|
||||
* The ordinary, cofactor-cleared public key.
|
||||
*
|
||||
* ⚠️ **A bridge's long-term identity key is CLEAN.** Only the ephemeral
|
||||
* session keys keep their cofactor, because only those travel as
|
||||
* representatives. (A dirty identity key does in fact still complete a
|
||||
* handshake — X25519 clamps, so the order-8 component cancels on both
|
||||
* sides — but every other implementation and every bridge-line tool expects
|
||||
* the clean one.)
|
||||
*/
|
||||
fun publicKey(privateKey: ByteArray): ByteArray =
|
||||
ladder(trimScalar(privateKey), BASE_POINT_9, 255)
|
||||
|
||||
/**
|
||||
* Ordinary X25519.
|
||||
*
|
||||
* 🔴 The result must be checked for all-zeros by the caller: a peer that
|
||||
* sends a low-order point drives every shared secret to zero, which a
|
||||
* handshake has to reject rather than key from.
|
||||
*/
|
||||
fun sharedSecret(privateKey: ByteArray, peerPublicKey: ByteArray): ByteArray =
|
||||
ladder(trimScalar(privateKey), peerPublicKey, 255)
|
||||
}
|
||||
@@ -0,0 +1,124 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.bouncycastle.crypto.digests.SHA256Digest
|
||||
import org.bouncycastle.crypto.generators.HKDFBytesGenerator
|
||||
import org.bouncycastle.crypto.params.HKDFParameters
|
||||
import javax.crypto.Mac
|
||||
import javax.crypto.spec.SecretKeySpec
|
||||
|
||||
/**
|
||||
* obfs4's ntor handshake.
|
||||
*
|
||||
* 🔴 **The reference's own comment contradicts the reference's own code, and
|
||||
* the code is the protocol.** lyrebird's `ntorCommon` documents its input
|
||||
* ordering as `ID | B | Y | X | PROTOID`, then builds
|
||||
* `B | B | X | Y | PROTOID | ID` — with `B` appearing **twice**, because the
|
||||
* buffer is constructed with it and then written to again. Port the comment and
|
||||
* you get a handshake that computes cleanly, yields a respectable-looking
|
||||
* 32-byte KEY_SEED, and cannot talk to a single real bridge.
|
||||
*
|
||||
* ⚠️ This is not Tor's ntor. It is obfs4's variant, and the difference is
|
||||
* exactly that quirk.
|
||||
*/
|
||||
object Ntor {
|
||||
|
||||
const val NODE_ID_LENGTH = 20
|
||||
const val KEY_SEED_LENGTH = 32
|
||||
const val AUTH_LENGTH = 32
|
||||
|
||||
private val PROTO_ID = "ntor-curve25519-sha256-1".toByteArray()
|
||||
private val T_MAC = PROTO_ID + ":mac".toByteArray()
|
||||
private val T_KEY = PROTO_ID + ":key_extract".toByteArray()
|
||||
private val T_VERIFY = PROTO_ID + ":key_verify".toByteArray()
|
||||
private val M_EXPAND = PROTO_ID + ":key_expand".toByteArray()
|
||||
|
||||
data class Result(val keySeed: ByteArray, val auth: ByteArray) {
|
||||
override fun equals(other: Any?): Boolean =
|
||||
other is Result && keySeed.contentEquals(other.keySeed) && auth.contentEquals(other.auth)
|
||||
override fun hashCode(): Int = keySeed.contentHashCode() * 31 + auth.contentHashCode()
|
||||
}
|
||||
|
||||
/**
|
||||
* The client half. `null` means the handshake must be abandoned.
|
||||
*
|
||||
* The caller must **also** compare `auth` against the server's, in constant
|
||||
* time, with [authMatches]. A non-null result proves only that this side
|
||||
* computed something.
|
||||
*/
|
||||
fun clientHandshake(
|
||||
clientPrivate: ByteArray, clientPublic: ByteArray,
|
||||
serverPublic: ByteArray, idPublic: ByteArray, nodeId: ByteArray,
|
||||
): Result? {
|
||||
// EXP(Y,x) | EXP(B,x)
|
||||
val exp1 = Ladder.sharedSecret(clientPrivate, serverPublic)
|
||||
val exp2 = Ladder.sharedSecret(clientPrivate, idPublic)
|
||||
if (isZero(exp1) || isZero(exp2)) return null
|
||||
return common(exp1 + exp2, nodeId, idPublic, clientPublic, serverPublic)
|
||||
}
|
||||
|
||||
/** The server half. `null` means the handshake must be abandoned. */
|
||||
fun serverHandshake(
|
||||
clientPublic: ByteArray, serverPrivate: ByteArray, serverPublic: ByteArray,
|
||||
idPrivate: ByteArray, idPublic: ByteArray, nodeId: ByteArray,
|
||||
): Result? {
|
||||
// EXP(X,y) | EXP(X,b)
|
||||
val exp1 = Ladder.sharedSecret(serverPrivate, clientPublic)
|
||||
val exp2 = Ladder.sharedSecret(idPrivate, clientPublic)
|
||||
if (isZero(exp1) || isZero(exp2)) return null
|
||||
return common(exp1 + exp2, nodeId, idPublic, clientPublic, serverPublic)
|
||||
}
|
||||
|
||||
private fun common(
|
||||
exponents: ByteArray, nodeId: ByteArray,
|
||||
b: ByteArray, x: ByteArray, y: ByteArray,
|
||||
): Result {
|
||||
// 🔴 `b` twice. Not a typo faithfully reproduced by accident — it is the
|
||||
// wire format.
|
||||
val suffix = b + b + x + y + PROTO_ID + nodeId
|
||||
val secretInput = exponents + suffix
|
||||
|
||||
val keySeed = hmac(T_KEY, secretInput)
|
||||
val verify = hmac(T_VERIFY, secretInput)
|
||||
val auth = hmac(T_MAC, verify + suffix + "Server".toByteArray())
|
||||
return Result(keySeed, auth)
|
||||
}
|
||||
|
||||
/**
|
||||
* HKDF-SHA256 over KEY_SEED, for the framing layer's keys.
|
||||
*
|
||||
* ⚠️ The salt is `t_key` — the same string used as the HMAC key for
|
||||
* KEY_SEED — and the info is `m_expand`. Swapping them produces key material
|
||||
* that is perfectly random-looking and shared with nobody.
|
||||
*/
|
||||
fun kdf(keySeed: ByteArray, outputByteCount: Int): ByteArray {
|
||||
val hkdf = HKDFBytesGenerator(SHA256Digest())
|
||||
hkdf.init(HKDFParameters(keySeed, T_KEY, M_EXPAND))
|
||||
return ByteArray(outputByteCount).also { hkdf.generateBytes(it, 0, it.size) }
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 **Constant time, and it has to be.** `auth` arrives from the network
|
||||
* and is compared against a locally computed value; a byte-at-a-time
|
||||
* comparison that returns early hands an attacker a way to construct a
|
||||
* valid-looking one a byte at a time.
|
||||
*/
|
||||
fun authMatches(a: ByteArray, b: ByteArray): Boolean {
|
||||
if (a.size != b.size) return false
|
||||
var diff = 0
|
||||
for (i in a.indices) diff = diff or (a[i].toInt() xor b[i].toInt())
|
||||
return diff == 0
|
||||
}
|
||||
|
||||
/** A shared secret of all zeros means the peer sent a low-order point. */
|
||||
private fun isZero(x: ByteArray): Boolean {
|
||||
var acc = 0
|
||||
for (b in x) acc = acc or b.toInt()
|
||||
return acc == 0
|
||||
}
|
||||
|
||||
private fun hmac(key: ByteArray, message: ByteArray): ByteArray =
|
||||
Mac.getInstance("HmacSHA256").run {
|
||||
init(SecretKeySpec(key, "HmacSHA256"))
|
||||
doFinal(message)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,213 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import java.io.InputStream
|
||||
import java.io.OutputStream
|
||||
import java.net.InetAddress
|
||||
import java.net.InetSocketAddress
|
||||
import java.net.Socket
|
||||
import java.net.SocketAddress
|
||||
import java.security.SecureRandom
|
||||
import javax.net.SocketFactory
|
||||
|
||||
/**
|
||||
* A bridge, as it appears in a bridge line.
|
||||
*
|
||||
* ⚠️ Parsed from `cert=` rather than taking the two halves separately, because
|
||||
* `cert=` is what an operator is actually handed. Splitting it here means the
|
||||
* app never has to.
|
||||
*/
|
||||
data class Obfs4Bridge(
|
||||
val host: String,
|
||||
val port: Int,
|
||||
val nodeId: ByteArray,
|
||||
val identityPublic: ByteArray,
|
||||
) {
|
||||
init {
|
||||
require(nodeId.size == 20) { "a node id is 20 bytes" }
|
||||
require(identityPublic.size == 32) { "an identity key is 32 bytes" }
|
||||
}
|
||||
|
||||
override fun equals(other: Any?) = other is Obfs4Bridge && host == other.host &&
|
||||
port == other.port && nodeId.contentEquals(other.nodeId) &&
|
||||
identityPublic.contentEquals(other.identityPublic)
|
||||
|
||||
override fun hashCode() = (host.hashCode() * 31 + port) * 31 + nodeId.contentHashCode()
|
||||
|
||||
companion object {
|
||||
/**
|
||||
* `cert=` is base64 of `nodeId ‖ identityPublic` with its trailing `==`
|
||||
* stripped — lyrebird re-appends it, so this must too.
|
||||
*/
|
||||
fun fromCert(host: String, port: Int, cert: String): Obfs4Bridge {
|
||||
val raw = java.util.Base64.getDecoder().decode(cert + "==")
|
||||
require(raw.size == 52) { "a cert decodes to 52 bytes, not ${raw.size}" }
|
||||
return Obfs4Bridge(host, port, raw.copyOfRange(0, 20), raw.copyOfRange(20, 52))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* A `Socket` that speaks obfs4 to a bridge and plaintext to its caller.
|
||||
*
|
||||
* 🔴 **The handshake happens inside `connect`, before any stream is handed
|
||||
* out.** OkHttp will start writing an HTTP request the moment it has a
|
||||
* connected socket, so a handshake deferred to the first write would interleave
|
||||
* with request bytes and desynchronise the frame decoder on the first request
|
||||
* of every connection.
|
||||
*
|
||||
* ⚠️ **A rejected handshake looks like a hang, not an error.** obfs4 bridges do
|
||||
* not answer what they cannot verify, so the read timeout below is what turns a
|
||||
* wire-format problem into a diagnosable failure instead of a stuck app.
|
||||
*/
|
||||
class Obfs4Socket(private val bridge: Obfs4Bridge) : Socket() {
|
||||
private var plane: Obfs4DataPlane? = null
|
||||
private val random = SecureRandom()
|
||||
private var pending = ByteArray(0)
|
||||
|
||||
override fun connect(endpoint: SocketAddress?, timeout: Int) {
|
||||
// ⚠️ The endpoint OkHttp asks for is the RELAY's address, and it is
|
||||
// deliberately ignored: the socket goes to the bridge, which proxies on.
|
||||
// Connecting to the endpoint here would defeat the entire transport.
|
||||
super.connect(InetSocketAddress(bridge.host, bridge.port), timeout)
|
||||
soTimeout = if (timeout > 0) timeout else HANDSHAKE_TIMEOUT_MILLIS
|
||||
performHandshake()
|
||||
}
|
||||
|
||||
private fun performHandshake() {
|
||||
var priv: ByteArray; var pub: ByteArray; var repr: ByteArray
|
||||
while (true) {
|
||||
// 🔴 Fresh entropy each attempt, never a re-tweak of a key that had
|
||||
// no representative: representability is a property of the key, so
|
||||
// retrying the same one differently would bias which keys are used.
|
||||
val candidate = ByteArray(32).also { random.nextBytes(it) }
|
||||
val p = Ladder.dirtyPublicKey(candidate)
|
||||
val r = Elligator2.representativeForPublicKey(p, random.nextInt(256))
|
||||
if (r != null) { priv = candidate; pub = p; repr = r; break }
|
||||
}
|
||||
|
||||
val handshake = Obfs4ClientHandshake(
|
||||
bridge.nodeId, bridge.identityPublic, priv, pub, repr,
|
||||
Obfs4Handshake.currentEpochHour())
|
||||
|
||||
// ⚠️ Padding length must come from a CSPRNG. A fixed or predictable
|
||||
// handshake length is a fingerprint on its own, however well disguised
|
||||
// the bytes inside it are.
|
||||
val padLength = Obfs4Handshake.CLIENT_MIN_PAD_LENGTH +
|
||||
random.nextInt(Obfs4Handshake.CLIENT_MAX_PAD_LENGTH -
|
||||
Obfs4Handshake.CLIENT_MIN_PAD_LENGTH)
|
||||
val padding = ByteArray(minOf(padLength, 1200)).also { random.nextBytes(it) }
|
||||
|
||||
val out = super.getOutputStream()
|
||||
out.write(handshake.opening(padding))
|
||||
out.flush()
|
||||
|
||||
val input = super.getInputStream()
|
||||
val buf = ByteArray(16384)
|
||||
var established: Obfs4ClientHandshake.Established? = null
|
||||
for (attempt in 0 until 16) {
|
||||
val n = input.read(buf)
|
||||
if (n <= 0) throw Obfs4HandshakeRefused()
|
||||
established = handshake.receive(buf.copyOfRange(0, n))
|
||||
if (established != null) break
|
||||
}
|
||||
val session = established ?: throw Obfs4HandshakeRefused()
|
||||
|
||||
val keys = Obfs4Session.directionKeys(session.keySeed, isClient = true)
|
||||
val dataPlane = Obfs4DataPlane(keys.first, keys.second)
|
||||
// ⚠️ Whatever followed the handshake in the same read is already framed
|
||||
// traffic — usually the bridge's PRNG seed. Dropping it desynchronises
|
||||
// the frame decoder immediately.
|
||||
pending = dataPlane.receive(session.leftover, isClient = true)
|
||||
plane = dataPlane
|
||||
}
|
||||
|
||||
override fun getOutputStream(): OutputStream {
|
||||
val dataPlane = plane ?: throw IllegalStateException("not connected")
|
||||
val raw = super.getOutputStream()
|
||||
return object : OutputStream() {
|
||||
override fun write(b: Int) = write(byteArrayOf(b.toByte()), 0, 1)
|
||||
override fun write(b: ByteArray, off: Int, len: Int) {
|
||||
raw.write(dataPlane.send(b.copyOfRange(off, off + len)))
|
||||
}
|
||||
override fun flush() = raw.flush()
|
||||
}
|
||||
}
|
||||
|
||||
override fun getInputStream(): InputStream {
|
||||
val dataPlane = plane ?: throw IllegalStateException("not connected")
|
||||
val raw = super.getInputStream()
|
||||
return object : InputStream() {
|
||||
private var buffered = pending.also { pending = ByteArray(0) }
|
||||
private var offset = 0
|
||||
|
||||
override fun read(): Int {
|
||||
val one = ByteArray(1)
|
||||
return if (read(one, 0, 1) == 1) one[0].toInt() and 0xff else -1
|
||||
}
|
||||
|
||||
override fun read(b: ByteArray, off: Int, len: Int): Int {
|
||||
// ⚠️ Loops until a frame yields application bytes. A frame can
|
||||
// decode to nothing at all — padding-only packets are cover
|
||||
// traffic — and returning 0 there would look like end-of-stream
|
||||
// to most callers.
|
||||
while (offset >= buffered.size) {
|
||||
val chunk = ByteArray(16384)
|
||||
val n = raw.read(chunk)
|
||||
if (n <= 0) return -1
|
||||
buffered = dataPlane.receive(chunk.copyOfRange(0, n), isClient = true)
|
||||
offset = 0
|
||||
}
|
||||
val n = minOf(len, buffered.size - offset)
|
||||
System.arraycopy(buffered, offset, b, off, n)
|
||||
offset += n
|
||||
return n
|
||||
}
|
||||
|
||||
override fun available(): Int = buffered.size - offset
|
||||
}
|
||||
}
|
||||
|
||||
companion object {
|
||||
const val HANDSHAKE_TIMEOUT_MILLIS = 20_000
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 The bridge said nothing, which is what a bridge does when it cannot verify
|
||||
* a handshake — or when it is not there at all. The two are indistinguishable
|
||||
* on purpose, so this message must not claim to know which.
|
||||
*/
|
||||
class Obfs4HandshakeRefused : java.io.IOException(
|
||||
"the bridge did not complete a handshake. obfs4 bridges stay silent when a handshake " +
|
||||
"is invalid, so this means either the bridge line is wrong or nothing is listening.")
|
||||
|
||||
/**
|
||||
* Hands OkHttp obfs4 sockets.
|
||||
*
|
||||
* ⚠️ **Every overload must be implemented, not just the one OkHttp happens to
|
||||
* call.** `SocketFactory` has four `createSocket` shapes; leaving any of them
|
||||
* returning a plain socket means some code path silently bypasses the transport
|
||||
* — the traffic still works, which is exactly why nobody would notice.
|
||||
*/
|
||||
class Obfs4SocketFactory(private val bridge: Obfs4Bridge) : SocketFactory() {
|
||||
override fun createSocket(): Socket = Obfs4Socket(bridge)
|
||||
|
||||
override fun createSocket(host: String, port: Int): Socket =
|
||||
Obfs4Socket(bridge).apply { connect(InetSocketAddress(host, port)) }
|
||||
|
||||
override fun createSocket(host: String, port: Int, localHost: InetAddress, localPort: Int): Socket =
|
||||
Obfs4Socket(bridge).apply {
|
||||
bind(InetSocketAddress(localHost, localPort))
|
||||
connect(InetSocketAddress(host, port))
|
||||
}
|
||||
|
||||
override fun createSocket(host: InetAddress, port: Int): Socket =
|
||||
Obfs4Socket(bridge).apply { connect(InetSocketAddress(host, port)) }
|
||||
|
||||
override fun createSocket(
|
||||
address: InetAddress, port: Int, localAddress: InetAddress, localPort: Int,
|
||||
): Socket = Obfs4Socket(bridge).apply {
|
||||
bind(InetSocketAddress(localAddress, localPort))
|
||||
connect(InetSocketAddress(address, port))
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,133 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
/**
|
||||
* SipHash-2-4, and obfs4's length-obfuscation DRBG.
|
||||
*
|
||||
* ⚠️ **Hand-written despite BouncyCastle shipping a SipHash**, which is worth
|
||||
* justifying because every other primitive in this module is BouncyCastle's.
|
||||
* BC's `SipHash` is a `Mac`: `doFinal` **resets** the state. obfs4's DRBG
|
||||
* writes eight bytes, finalises, writes eight more and finalises again —
|
||||
* without ever resetting. Emulating that with a resetting MAC means re-hashing
|
||||
* the entire history for every block, which is O(n²) in the number of frames on
|
||||
* a connection. So the state machine is written out; it is fifty lines and
|
||||
* there are vectors for it.
|
||||
*/
|
||||
class SipHash24(key: ByteArray) {
|
||||
private var v0: Long
|
||||
private var v1: Long
|
||||
private var v2: Long
|
||||
private var v3: Long
|
||||
private var buffer = ByteArray(0)
|
||||
private var totalBytes = 0
|
||||
|
||||
init {
|
||||
require(key.size == 16) { "SipHash-2-4 takes a 16-byte key" }
|
||||
val k0 = load64(key, 0)
|
||||
val k1 = load64(key, 8)
|
||||
v0 = k0 xor 0x736f6d6570736575uL.toLong()
|
||||
v1 = k1 xor 0x646f72616e646f6duL.toLong()
|
||||
v2 = k0 xor 0x6c7967656e657261uL.toLong()
|
||||
v3 = k1 xor 0x7465646279746573uL.toLong()
|
||||
}
|
||||
|
||||
private constructor(other: SipHash24) : this(ByteArray(16)) {
|
||||
v0 = other.v0; v1 = other.v1; v2 = other.v2; v3 = other.v3
|
||||
buffer = other.buffer.copyOf()
|
||||
totalBytes = other.totalBytes
|
||||
}
|
||||
|
||||
fun update(bytes: ByteArray) {
|
||||
totalBytes += bytes.size
|
||||
buffer += bytes
|
||||
var offset = 0
|
||||
while (buffer.size - offset >= 8) {
|
||||
val m = load64(buffer, offset)
|
||||
v3 = v3 xor m
|
||||
round(); round()
|
||||
v0 = v0 xor m
|
||||
offset += 8
|
||||
}
|
||||
if (offset > 0) buffer = buffer.copyOfRange(offset, buffer.size)
|
||||
}
|
||||
|
||||
/**
|
||||
* The digest so far.
|
||||
*
|
||||
* 🔴 **Finalises a COPY.** The DRBG keeps writing after each read, so a
|
||||
* `sum` that mutated the running state would produce a keystream correct
|
||||
* for exactly one block — and the first frame of a connection would decode
|
||||
* perfectly before everything after it failed.
|
||||
*/
|
||||
fun sum(): Long {
|
||||
val c = SipHash24(this)
|
||||
var b = (c.totalBytes.toLong() and 0xff) shl 56
|
||||
for ((i, byte) in c.buffer.withIndex()) b = b or ((byte.toLong() and 0xff) shl (8 * i))
|
||||
c.v3 = c.v3 xor b
|
||||
c.round(); c.round()
|
||||
c.v0 = c.v0 xor b
|
||||
c.v2 = c.v2 xor 0xff
|
||||
c.round(); c.round(); c.round(); c.round()
|
||||
return c.v0 xor c.v1 xor c.v2 xor c.v3
|
||||
}
|
||||
|
||||
/** ⚠️ Little-endian, matching the Go implementation obfs4 uses. */
|
||||
fun sumBytes(): ByteArray {
|
||||
val s = sum()
|
||||
return ByteArray(8) { ((s ushr (8 * it)) and 0xff).toByte() }
|
||||
}
|
||||
|
||||
private fun round() {
|
||||
v0 += v1; v1 = java.lang.Long.rotateLeft(v1, 13); v1 = v1 xor v0
|
||||
v0 = java.lang.Long.rotateLeft(v0, 32)
|
||||
v2 += v3; v3 = java.lang.Long.rotateLeft(v3, 16); v3 = v3 xor v2
|
||||
v0 += v3; v3 = java.lang.Long.rotateLeft(v3, 21); v3 = v3 xor v0
|
||||
v2 += v1; v1 = java.lang.Long.rotateLeft(v1, 17); v1 = v1 xor v2
|
||||
v2 = java.lang.Long.rotateLeft(v2, 32)
|
||||
}
|
||||
|
||||
private fun load64(b: ByteArray, offset: Int): Long {
|
||||
var v = 0L
|
||||
for (i in 7 downTo 0) v = (v shl 8) or (b[offset + i].toLong() and 0xff)
|
||||
return v
|
||||
}
|
||||
|
||||
companion object {
|
||||
fun hash(key: ByteArray, message: ByteArray): ByteArray =
|
||||
SipHash24(key).also { it.update(message) }.sumBytes()
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* obfs4's length-obfuscation DRBG: SipHash-2-4 run in OFB.
|
||||
*
|
||||
* 🔴 **The reference's comment describes a different algorithm from its code.**
|
||||
* The comment says `IV[n] = H(K, IV[n-1])` — a fresh hash of the previous block
|
||||
* each time. The code never resets the hash, so block `n` is really
|
||||
* `SipHash(K, IV[0] ‖ … ‖ IV[n-1])`, cumulative.
|
||||
*
|
||||
* The two agree on block **one** and diverge from block two. An implementation
|
||||
* built from the comment decodes the first frame of a connection perfectly and
|
||||
* then fails, which is about the least helpful symptom available.
|
||||
*/
|
||||
class LengthDrbg(seed: ByteArray) {
|
||||
private val hash: SipHash24
|
||||
private var ofb: ByteArray
|
||||
|
||||
init {
|
||||
require(seed.size == 24) { "the DRBG seed is 24 bytes" }
|
||||
hash = SipHash24(seed.copyOfRange(0, 16))
|
||||
ofb = seed.copyOfRange(16, 24)
|
||||
}
|
||||
|
||||
fun nextBlock(): ByteArray {
|
||||
hash.update(ofb)
|
||||
ofb = hash.sumBytes()
|
||||
return ofb
|
||||
}
|
||||
|
||||
/** The two bytes a frame length is masked with — the **big-endian** head. */
|
||||
fun nextLengthMask(): Int {
|
||||
val block = nextBlock()
|
||||
return ((block[0].toInt() and 0xff) shl 8) or (block[1].toInt() and 0xff)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,279 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertContentEquals
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertFailsWith
|
||||
import kotlin.test.assertFalse
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* Go's RNG semantics, the packet layer, the replay filter, and a whole session.
|
||||
*
|
||||
* ⚠️ **The session tests are self-consistency, a weaker guarantee than the rest
|
||||
* of this module.** Everything below the connection layer is checked against
|
||||
* lyrebird's own bytes; this layer is checked against itself, because
|
||||
* `makePacket` is unexported and session keys are internal to a running
|
||||
* connection. Two identically-wrong ends agree perfectly — the definitive check
|
||||
* is a live handshake against a real bridge, which the Swift port has and this
|
||||
* one does not yet.
|
||||
*/
|
||||
class ConnectionTest {
|
||||
|
||||
private fun randVectors(): JSONObject {
|
||||
val s = javaClass.classLoader.getResourceAsStream("rand-vectors.json")
|
||||
assertNotNull(s, "rand-vectors.json is missing")
|
||||
return JSONObject(s.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
|
||||
// MARK: - Go RNG parity
|
||||
|
||||
@Test
|
||||
fun `int63 matches go`() {
|
||||
val v = randVectors().getJSONArray("rand")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val rng = GoRandom(hex(o.getString("seed")))
|
||||
val want = o.getJSONArray("int63")
|
||||
for (j in 0 until want.length()) {
|
||||
assertEquals(want.getString(j), rng.int63().toString(), "draw $j")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ `intn(100)` takes the rejection-sampling branch and `intn(1)` the
|
||||
* power-of-two mask branch. They consume different amounts of randomness, so
|
||||
* both are covered.
|
||||
*/
|
||||
@Test
|
||||
fun `intn matches go on both branches`() {
|
||||
val v = randVectors().getJSONArray("rand")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
for (field in listOf("intn_100" to 100, "intn_1" to 1)) {
|
||||
val rng = GoRandom(hex(o.getString("seed")))
|
||||
val want = o.getJSONArray(field.first)
|
||||
for (j in 0 until want.length()) {
|
||||
assertEquals(want.getInt(j), rng.intn(field.second), "${field.first} draw $j")
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 Go divides `Int63` by 2^63 rather than the cleaner `Int63n(1<<53)`
|
||||
* form, deliberately, to preserve its value stream. Bit equality is
|
||||
* asserted: a "close enough" double here is a different padding length
|
||||
* later.
|
||||
*/
|
||||
@Test
|
||||
fun `float64 matches go exactly`() {
|
||||
val v = randVectors().getJSONArray("rand")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val rng = GoRandom(hex(o.getString("seed")))
|
||||
val want = o.getJSONArray("float64")
|
||||
for (j in 0 until want.length()) {
|
||||
assertEquals(want.getDouble(j).toRawBits(), rng.float64().toRawBits(),
|
||||
"draw $j differs in its bits")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/** ⚠️ Including Go's useless first swap, which consumes a draw. */
|
||||
@Test
|
||||
fun `perm matches go`() {
|
||||
val v = randVectors().getJSONArray("rand")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val rng = GoRandom(hex(o.getString("seed")))
|
||||
val want = o.getJSONArray("perm_10")
|
||||
val got = rng.perm(10)
|
||||
for (j in 0 until want.length()) assertEquals(want.getInt(j), got[j], "perm[$j]")
|
||||
}
|
||||
}
|
||||
|
||||
/** The whole derivation, against the reference's own rendering of it. */
|
||||
@Test
|
||||
fun `the length distribution matches lyrebird`() {
|
||||
val v = randVectors().getJSONArray("dist")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val d = WeightedDist(hex(o.getString("seed")), o.getInt("min"), o.getInt("max"),
|
||||
o.getBoolean("biased"))
|
||||
val sb = StringBuilder("[ ")
|
||||
for (j in d.values.indices) {
|
||||
if (d.weights[j] > 0.01) sb.append("%d: %f ".format(d.values[j], d.weights[j]))
|
||||
}
|
||||
sb.append("]")
|
||||
if (sb.toString() != o.getString("string")) {
|
||||
mismatches += "biased=${o.getBoolean("biased")}\n want ${o.getString("string")}\n got $sb"
|
||||
}
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${v.length()} distributions differed.\n" +
|
||||
mismatches.take(2).joinToString("\n"))
|
||||
}
|
||||
|
||||
// MARK: - Packets
|
||||
|
||||
@Test
|
||||
fun `packets round trip at every interesting length`() {
|
||||
for (payloadLen in listOf(0, 1, 100, Obfs4Packet.MAX_PAYLOAD_LENGTH)) {
|
||||
for (padding in listOf(0, 1, 50)) {
|
||||
if (payloadLen + padding > Obfs4Packet.MAX_PAYLOAD_LENGTH) continue
|
||||
val payload = ByteArray(payloadLen) { it.toByte() }
|
||||
val encoded = Obfs4Packet.encode(Obfs4Packet.TYPE_PAYLOAD, payload, padding)
|
||||
assertEquals(Obfs4Packet.OVERHEAD + payloadLen + padding, encoded.size)
|
||||
val (type, decoded) = Obfs4Packet.decode(encoded)
|
||||
assertEquals(Obfs4Packet.TYPE_PAYLOAD, type)
|
||||
assertContentEquals(payload, decoded, "padding $padding leaked into the payload")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 A declared length longer than the packet is the classic parser bug,
|
||||
* handed to you by whoever is on the other end. In the Swift port, removing
|
||||
* this guard turned one malformed packet into a process kill.
|
||||
*/
|
||||
@Test
|
||||
fun `a declared length longer than the packet is rejected`() {
|
||||
val packet = Obfs4Packet.encode(Obfs4Packet.TYPE_PAYLOAD, byteArrayOf(1, 2, 3), 0)
|
||||
packet[1] = 0xff.toByte(); packet[2] = 0xff.toByte()
|
||||
assertFailsWith<Obfs4Packet.DeclaredLengthExceedsPacket> { Obfs4Packet.decode(packet) }
|
||||
assertFailsWith<Obfs4Packet.TooShort> { Obfs4Packet.decode(byteArrayOf(0, 0)) }
|
||||
}
|
||||
|
||||
/** ⚠️ Unknown types are ignored so the protocol can grow. */
|
||||
@Test
|
||||
fun `unknown packet types are ignored rather than rejected`() {
|
||||
val packet = Obfs4Packet.encode(Obfs4Packet.TYPE_PAYLOAD, byteArrayOf(9, 9), 0)
|
||||
packet[0] = 0x7f
|
||||
val (type, payload) = Obfs4Packet.decode(packet)
|
||||
assertNull(type, "an unknown type must decode to null, not throw")
|
||||
assertContentEquals(byteArrayOf(9, 9), payload)
|
||||
}
|
||||
|
||||
// MARK: - Replay
|
||||
|
||||
@Test
|
||||
fun `the replay filter rejects a second sighting`() {
|
||||
val filter = ReplayFilter()
|
||||
val mac = ByteArray(16) { 0xab.toByte() }
|
||||
assertFalse(filter.testAndSet(mac), "the first sighting must pass")
|
||||
assertTrue(filter.testAndSet(mac), "the second must be rejected")
|
||||
val other = mac.copyOf().also { it[0] = (it[0].toInt() xor 1).toByte() }
|
||||
assertFalse(filter.testAndSet(other), "a different MAC is not a replay")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `replay entries expire`() {
|
||||
val filter = ReplayFilter(lifetimeMillis = 60_000)
|
||||
val mac = ByteArray(16) { 1 }
|
||||
assertFalse(filter.testAndSet(mac, 0))
|
||||
assertTrue(filter.testAndSet(mac, 30_000))
|
||||
assertFalse(filter.testAndSet(mac, 120_000), "an expired entry must not block forever")
|
||||
}
|
||||
|
||||
// MARK: - A whole session
|
||||
|
||||
/**
|
||||
* 🔴 **The key halves swap by role.** Two ends that both take the first half
|
||||
* each work perfectly alone and cannot hear each other.
|
||||
*/
|
||||
@Test
|
||||
fun `the direction keys are mirrored`() {
|
||||
val seed = ByteArray(32) { it.toByte() }
|
||||
val c = Obfs4Session.directionKeys(seed, true)
|
||||
val s = Obfs4Session.directionKeys(seed, false)
|
||||
assertContentEquals(c.first, s.second)
|
||||
assertContentEquals(c.second, s.first)
|
||||
assertFalse(c.first.contentEquals(c.second))
|
||||
}
|
||||
|
||||
private fun pair(): Pair<Obfs4DataPlane, Obfs4DataPlane> {
|
||||
val seed = ByteArray(32) { (it * 7 + 3).toByte() }
|
||||
val c = Obfs4Session.directionKeys(seed, true)
|
||||
val s = Obfs4Session.directionKeys(seed, false)
|
||||
return Obfs4DataPlane(c.first, c.second) to Obfs4DataPlane(s.first, s.second)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `data flows both ways through padded packets`() {
|
||||
val (client, server) = pair()
|
||||
val hello = "hello from the client".toByteArray()
|
||||
val wire = client.send(hello, 137)
|
||||
assertTrue(wire.size > hello.size + 137, "padding must actually reach the wire")
|
||||
assertContentEquals(hello, server.receive(wire, isClient = false))
|
||||
|
||||
val reply = "and back again".toByteArray()
|
||||
assertContentEquals(reply, client.receive(server.send(reply)))
|
||||
}
|
||||
|
||||
/** ⚠️ A write larger than one packet must span several, not be truncated. */
|
||||
@Test
|
||||
fun `large writes span multiple packets`() {
|
||||
val (client, server) = pair()
|
||||
val big = ByteArray(Obfs4Packet.MAX_PAYLOAD_LENGTH * 3 + 17) { it.toByte() }
|
||||
assertContentEquals(big, server.receive(client.send(big), isClient = false))
|
||||
}
|
||||
|
||||
/** Sockets deliver in arbitrary pieces; the result must not depend on how. */
|
||||
@Test
|
||||
fun `delivery in arbitrary chunks makes no difference`() {
|
||||
val (client, server) = pair()
|
||||
val message = ByteArray(5000) { (it * 31).toByte() }
|
||||
val wire = client.send(message, 11)
|
||||
|
||||
var received = ByteArray(0)
|
||||
var offset = 0
|
||||
for (chunk in listOf(1, 7, 3, 1000, 64, 2, 9999)) {
|
||||
if (offset >= wire.size) break
|
||||
val n = minOf(chunk, wire.size - offset)
|
||||
received += server.receive(wire.copyOfRange(offset, offset + n), isClient = false)
|
||||
offset += n
|
||||
}
|
||||
while (offset < wire.size) {
|
||||
received += server.receive(byteArrayOf(wire[offset]), isClient = false)
|
||||
offset++
|
||||
}
|
||||
assertContentEquals(message, received)
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 Only a client adopts a PRNG seed. A server that honoured one would let
|
||||
* any peer dictate its padding.
|
||||
*/
|
||||
@Test
|
||||
fun `only the client adopts a prng seed`() {
|
||||
val (client, server) = pair()
|
||||
val seed = ByteArray(24) { (it * 5 + 1).toByte() }
|
||||
|
||||
val fromServer = server.sendPrngSeed(seed)
|
||||
assertContentEquals(ByteArray(0), client.receive(fromServer, isClient = true))
|
||||
assertNotNull(client.lengthDist, "the client must adopt the seed")
|
||||
|
||||
val (c2, s2) = pair()
|
||||
s2.receive(c2.sendPrngSeed(seed), isClient = false)
|
||||
assertNull(s2.lengthDist, "a server must never adopt a peer's seed")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `padding-only traffic carries no data`() {
|
||||
val (client, server) = pair()
|
||||
val wire = client.sendPadding(500)
|
||||
assertTrue(wire.size > 500)
|
||||
assertContentEquals(ByteArray(0), server.receive(wire, isClient = false),
|
||||
"cover traffic must not surface as application data")
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,187 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* The Kotlin map, against the same vectors the Swift port uses.
|
||||
*
|
||||
* 🔴 **These are the only check that means anything here.** Elligator2 can be
|
||||
* wrong without failing: a subtly incorrect map still produces 32 bytes, still
|
||||
* completes a handshake, and is merely not quite uniform — which is exactly what
|
||||
* a censor's entropy test looks for and exactly what no runtime symptom will
|
||||
* reveal.
|
||||
*
|
||||
* ⚠️ **These vectors come from lyrebird, not from the Swift port.** Two
|
||||
* independent implementations agreeing with the same *reference* is a real
|
||||
* statement; two of our own implementations agreeing with each other is not,
|
||||
* and would hide any mistake shared between them.
|
||||
*/
|
||||
class Elligator2Test {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("elligator-vectors.json")
|
||||
assertNotNull(stream, "the vectors are missing from test resources")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
@Test
|
||||
fun `the direct map agrees with the reference`() {
|
||||
val reverse = vectors().getJSONArray("reverse")
|
||||
assertTrue(reverse.length() > 100, "too few vectors to mean anything")
|
||||
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until reverse.length()) {
|
||||
val v = reverse.getJSONObject(i)
|
||||
val got = Elligator2.publicKeyFromRepresentative(hex(v.getString("representative")))
|
||||
val want = v.getString("public")
|
||||
if (hex(got) != want) {
|
||||
mismatches += "repr ${v.getString("representative")}\n want $want\n got ${hex(got)}"
|
||||
}
|
||||
}
|
||||
assertTrue(
|
||||
mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${reverse.length()} representatives mapped to the wrong " +
|
||||
"public key.\n\n${mismatches.take(3).joinToString("\n")}",
|
||||
)
|
||||
}
|
||||
|
||||
/** ⚠️ A map returning a constant would pass a careless equality test. */
|
||||
@Test
|
||||
fun `the map is not degenerate`() {
|
||||
val reverse = vectors().getJSONArray("reverse")
|
||||
val outputs = (0 until minOf(64, reverse.length())).map {
|
||||
hex(
|
||||
Elligator2.publicKeyFromRepresentative(
|
||||
hex(reverse.getJSONObject(it).getString("representative"))
|
||||
)
|
||||
)
|
||||
}.toSet()
|
||||
assertTrue(outputs.size > 60, "the map is collapsing distinct inputs onto one output")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `every reference key is representable for both tweak parities`() {
|
||||
val reverse = vectors().getJSONArray("reverse")
|
||||
val failures = mutableListOf<String>()
|
||||
for (i in 0 until reverse.length()) {
|
||||
val v = reverse.getJSONObject(i)
|
||||
for (tweak in listOf(0, 1)) {
|
||||
if (Elligator2.representativeForPublicKey(hex(v.getString("public")), tweak) == null) {
|
||||
failures += "${v.getString("public")} tweak=$tweak"
|
||||
}
|
||||
}
|
||||
}
|
||||
assertTrue(failures.isEmpty(), "${failures.size} reference keys had no representative")
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 The test that pins the bytes rather than merely their validity. Both
|
||||
* branches are legitimate representatives of the same key, so the reference's
|
||||
* own answer must be one of the two we produce.
|
||||
*/
|
||||
@Test
|
||||
fun `one tweak reproduces the reference representative exactly`() {
|
||||
val reverse = vectors().getJSONArray("reverse")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until reverse.length()) {
|
||||
val v = reverse.getJSONObject(i)
|
||||
val candidates = listOf(0, 1).mapNotNull { tweak ->
|
||||
Elligator2.representativeForPublicKey(hex(v.getString("public")), tweak)
|
||||
?.also { it[31] = (it[31].toInt() and 0x3f).toByte() }
|
||||
?.let { hex(it) }
|
||||
}
|
||||
val want = hex(v.getString("representative"))
|
||||
want[31] = (want[31].toInt() and 0x3f).toByte()
|
||||
if (hex(want) !in candidates) {
|
||||
mismatches += "public ${v.getString("public")}\n want ${hex(want)}\n got $candidates"
|
||||
}
|
||||
}
|
||||
assertTrue(
|
||||
mismatches.isEmpty(),
|
||||
"${mismatches.size} keys produced a representative lyrebird did not.\n\n" +
|
||||
mismatches.take(2).joinToString("\n"),
|
||||
)
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 An implementation that never says no is broken: obfs4 relies on
|
||||
* discarding unrepresentable keys, and without that the representatives are
|
||||
* not uniform and nothing at runtime says so.
|
||||
*/
|
||||
@Test
|
||||
fun `about half of all points have no representative`() {
|
||||
// A fixed seed, so a failure is reproducible rather than a rumour.
|
||||
var state = 0x9E3779B97F4A7C15uL
|
||||
fun next(): ULong {
|
||||
state += 0x9E3779B97F4A7C15uL
|
||||
var z = state
|
||||
z = (z xor (z shr 30)) * 0xBF58476D1CE4E5B9uL
|
||||
z = (z xor (z shr 27)) * 0x94D049BB133111EBuL
|
||||
return z xor (z shr 31)
|
||||
}
|
||||
|
||||
val trials = 2048
|
||||
var represented = 0
|
||||
repeat(trials) {
|
||||
val u = ByteArray(32)
|
||||
for (word in 0 until 4) {
|
||||
val v = next()
|
||||
for (b in 0 until 8) u[word * 8 + b] = ((v shr (8 * b)) and 0xffuL).toByte()
|
||||
}
|
||||
if (Elligator2.representativeForPublicKey(u, 0) != null) represented++
|
||||
}
|
||||
val rate = represented.toDouble() / trials
|
||||
assertTrue(rate > 0.42, "far too many points rejected — rate $rate")
|
||||
assertTrue(rate < 0.58, "far too many points accepted — rate $rate")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `everything we produce maps back to the key it came from`() {
|
||||
val reverse = vectors().getJSONArray("reverse")
|
||||
val broken = mutableListOf<String>()
|
||||
for (i in 0 until reverse.length()) {
|
||||
val v = reverse.getJSONObject(i)
|
||||
val pk = hex(v.getString("public"))
|
||||
// ⚠️ Padding bits deliberately set: the direct map is responsible for
|
||||
// masking them off, and this is the only test that would notice if
|
||||
// it stopped.
|
||||
for (tweak in listOf(0x00, 0x41, 0x80, 0xc1)) {
|
||||
val repr = Elligator2.representativeForPublicKey(pk, tweak) ?: continue
|
||||
if (!Elligator2.publicKeyFromRepresentative(repr).contentEquals(pk)) {
|
||||
broken += "${v.getString("public")} tweak=$tweak"
|
||||
}
|
||||
}
|
||||
}
|
||||
assertTrue(broken.isEmpty(), "${broken.size} representatives did not map back")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `degenerate inputs have no representative`() {
|
||||
assertNull(Elligator2.representativeForPublicKey(ByteArray(32), 0), "u = 0")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `it agrees with the Swift port, via the same reference`() {
|
||||
// Not a comparison against Swift — a restatement that both are pinned to
|
||||
// the same lyrebird output. Kept as a named test so the relationship is
|
||||
// visible rather than folklore.
|
||||
val keygen = vectors().getJSONArray("keygen")
|
||||
assertTrue(keygen.length() >= 256, "the shared vector file changed shape")
|
||||
assertEquals(
|
||||
vectors().getJSONArray("reverse").length(),
|
||||
keygen.length(),
|
||||
"reverse and keygen must describe the same keypairs",
|
||||
)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,217 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertFailsWith
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* The framing layer, against lyrebird.
|
||||
*
|
||||
* ⚠️ Standalone vectors for XSalsa20 and Poly1305 sit beside the whole-frame
|
||||
* ones deliberately: without them a failing secretbox says only "one of these
|
||||
* two is wrong" and the next hour goes into finding out which.
|
||||
*/
|
||||
class FramingTest {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("framing-vectors.json")
|
||||
assertNotNull(stream, "the framing vectors are missing")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
/**
|
||||
* ⚠️ **This tests our CALL, not BouncyCastle's arithmetic.** Poly1305 is
|
||||
* vetted; what is unproven is whether the key and parameters are being
|
||||
* handed over correctly, which is exactly where a wrapper goes wrong.
|
||||
* Lengths straddle the 16-byte block, where the final partial block has its
|
||||
* own padding rule.
|
||||
*/
|
||||
@Test
|
||||
fun `poly1305 matches the reference`() {
|
||||
val v = vectors().getJSONArray("poly1305")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val poly = org.bouncycastle.crypto.macs.Poly1305()
|
||||
poly.init(org.bouncycastle.crypto.params.KeyParameter(hex(o.getString("key"))))
|
||||
val msg = hex(o.getString("message"))
|
||||
poly.update(msg, 0, msg.size)
|
||||
val tag = ByteArray(16).also { poly.doFinal(it, 0) }
|
||||
if (hex(tag) != o.getString("tag")) mismatches += "len ${msg.size}"
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} Poly1305 tags wrong (${mismatches.joinToString()})")
|
||||
}
|
||||
|
||||
/** Same rationale: this pins how Salsa20 is invoked, not that it is correct. */
|
||||
@Test
|
||||
fun `salsa20 keystream matches the reference`() {
|
||||
val v = vectors().getJSONArray("salsa20")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val want = hex(o.getString("keystream"))
|
||||
val engine = org.bouncycastle.crypto.engines.Salsa20Engine()
|
||||
engine.init(true, org.bouncycastle.crypto.params.ParametersWithIV(
|
||||
org.bouncycastle.crypto.params.KeyParameter(hex(o.getString("key"))),
|
||||
hex(o.getString("nonce"))))
|
||||
val got = ByteArray(want.size)
|
||||
engine.processBytes(ByteArray(want.size), 0, want.size, got, 0)
|
||||
if (!got.contentEquals(want)) mismatches += "len ${want.size}"
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} Salsa20 keystreams wrong (${mismatches.joinToString()})")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `secretbox matches the reference`() {
|
||||
val v = vectors().getJSONArray("secretbox")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val got = Secretbox.seal(hex(o.getString("plaintext")),
|
||||
hex(o.getString("nonce")), hex(o.getString("key")))
|
||||
if (hex(got) != o.getString("box")) {
|
||||
mismatches += "len ${o.getString("plaintext").length / 2}"
|
||||
}
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} secretboxes wrong (${mismatches.joinToString()}). " +
|
||||
"If the primitives pass on their own, the fault is the 32-byte " +
|
||||
"stream offset or the HSalsa20 subkey.")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `secretbox opens what it seals`() {
|
||||
val v = vectors().getJSONArray("secretbox")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
assertEquals(o.getString("plaintext"),
|
||||
hex(Secretbox.open(hex(o.getString("box")), hex(o.getString("nonce")),
|
||||
hex(o.getString("key")))!!))
|
||||
}
|
||||
}
|
||||
|
||||
/** 🔴 A tampered box must not open. This is the property the layer exists for. */
|
||||
@Test
|
||||
fun `secretbox rejects tampering`() {
|
||||
val v = vectors().getJSONArray("secretbox")
|
||||
var o: JSONObject? = null
|
||||
for (i in 0 until v.length()) {
|
||||
if (v.getJSONObject(i).getString("plaintext").isNotEmpty()) { o = v.getJSONObject(i); break }
|
||||
}
|
||||
assertNotNull(o)
|
||||
for (pos in listOf(0, 8, 15, 16, 17)) {
|
||||
val box = hex(o.getString("box"))
|
||||
if (pos >= box.size) continue
|
||||
box[pos] = (box[pos].toInt() xor 1).toByte()
|
||||
assertNull(Secretbox.open(box, hex(o.getString("nonce")), hex(o.getString("key"))),
|
||||
"a box with byte $pos flipped must not open")
|
||||
}
|
||||
val nonce = hex(o.getString("nonce")).also { it[0] = (it[0].toInt() xor 1).toByte() }
|
||||
assertNull(Secretbox.open(hex(o.getString("box")), nonce, hex(o.getString("key"))),
|
||||
"the wrong nonce must not open the box")
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 **A run of frames, not one frame.** The nonce counter and the DRBG both
|
||||
* advance per frame, so a single-frame test passes for an implementation
|
||||
* whose counter never increments and whose length mask is recomputed from
|
||||
* scratch every time.
|
||||
*/
|
||||
@Test
|
||||
fun `frame runs match lyrebird byte for byte`() {
|
||||
val runs = vectors().getJSONArray("frames")
|
||||
assertTrue(runs.getJSONObject(0).getJSONArray("frames").length() > 3,
|
||||
"too few frames per run")
|
||||
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until runs.length()) {
|
||||
val run = runs.getJSONObject(i)
|
||||
val enc = FrameEncoder(hex(run.getString("key")))
|
||||
val payloads = run.getJSONArray("payloads")
|
||||
val frames = run.getJSONArray("frames")
|
||||
for (j in 0 until payloads.length()) {
|
||||
val got = enc.encode(hex(payloads.getString(j)))
|
||||
if (hex(got) != frames.getString(j)) {
|
||||
mismatches += "run ${run.getString("key").take(12)}… frame $j"
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${runs.length()} runs diverged. A failure at frame 0 " +
|
||||
"is the secretbox or the first length mask; at frame 1+ it is the nonce " +
|
||||
"counter or the DRBG advance.\n" + mismatches.take(2).joinToString("\n"))
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the decoder reads lyrebirds frames`() {
|
||||
val runs = vectors().getJSONArray("frames")
|
||||
for (i in 0 until runs.length()) {
|
||||
val run = runs.getJSONObject(i)
|
||||
val dec = FrameDecoder(hex(run.getString("key")))
|
||||
val buffer = mutableListOf<Byte>()
|
||||
val frames = run.getJSONArray("frames")
|
||||
for (j in 0 until frames.length()) buffer.addAll(hex(frames.getString(j)).toList())
|
||||
val payloads = run.getJSONArray("payloads")
|
||||
for (j in 0 until payloads.length()) {
|
||||
assertEquals(payloads.getString(j), hex(dec.decode(buffer)), "frame $j")
|
||||
}
|
||||
assertTrue(buffer.isEmpty(), "bytes left over after the last frame")
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ Real sockets deliver frames in pieces. One byte at a time must give the
|
||||
* same result — and must not advance the DRBG twice on a length read across
|
||||
* two reads.
|
||||
*/
|
||||
@Test
|
||||
fun `decoding survives byte-at-a-time delivery`() {
|
||||
val run = vectors().getJSONArray("frames").getJSONObject(0)
|
||||
val dec = FrameDecoder(hex(run.getString("key")))
|
||||
val wire = mutableListOf<Byte>()
|
||||
val frames = run.getJSONArray("frames")
|
||||
for (j in 0 until frames.length()) wire.addAll(hex(frames.getString(j)).toList())
|
||||
|
||||
val buffer = mutableListOf<Byte>()
|
||||
val decoded = mutableListOf<String>()
|
||||
for (b in wire) {
|
||||
buffer.add(b)
|
||||
while (true) {
|
||||
try { decoded.add(hex(dec.decode(buffer))) }
|
||||
catch (e: FrameDecoder.NeedMoreData) { break }
|
||||
}
|
||||
}
|
||||
val payloads = run.getJSONArray("payloads")
|
||||
assertEquals((0 until payloads.length()).map { payloads.getString(it) }, decoded)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `tampered frames are rejected`() {
|
||||
val run = vectors().getJSONArray("frames").getJSONObject(0)
|
||||
val dec = FrameDecoder(hex(run.getString("key")))
|
||||
val buffer = hex(run.getJSONArray("frames").getString(0)).toMutableList()
|
||||
buffer[buffer.size - 1] = (buffer[buffer.size - 1].toInt() xor 1).toByte()
|
||||
assertFailsWith<FrameDecoder.TagMismatch> { dec.decode(buffer) }
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `oversized payloads are refused and the boundary is accepted`() {
|
||||
val enc = FrameEncoder(ByteArray(FrameEncoder.KEY_LENGTH) { 7 })
|
||||
assertFailsWith<FrameEncoder.PayloadTooLong> {
|
||||
enc.encode(ByteArray(FrameEncoder.MAX_PAYLOAD_LENGTH + 1))
|
||||
}
|
||||
enc.encode(ByteArray(FrameEncoder.MAX_PAYLOAD_LENGTH))
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,209 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertFailsWith
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* The handshake messages, against handshakes captured off the wire.
|
||||
*
|
||||
* 🔴 **These vectors are recordings, not computed values.** The handshake
|
||||
* contains random padding chosen inside lyrebird and a MAC over the current
|
||||
* epoch hour, so there is nothing to ask a reference to compute. The generator
|
||||
* runs a real lyrebird client against a real lyrebird server over a pipe,
|
||||
* proves they round-trip actual traffic, and records what each side sent.
|
||||
*
|
||||
* ⚠️ **The padding is recoverable, which makes these a test of generation too.**
|
||||
* It sits between a fixed-length prefix and the mark, so finding the mark
|
||||
* recovers it — and rebuilding from the recovered representative, padding and
|
||||
* hour must reproduce the recording byte for byte.
|
||||
*/
|
||||
class HandshakeTest {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("handshake-vectors.json")
|
||||
assertNotNull(stream, "the handshake vectors are missing")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
private fun key(o: JSONObject) =
|
||||
Obfs4Handshake.macKey(hex(o.getString("server_public_key")), hex(o.getString("node_id")))
|
||||
|
||||
/**
|
||||
* Feed bytes until the client handshake parses, the way a server reads a
|
||||
* socket. ⚠️ The recording contains the client's later traffic too, so there
|
||||
* is exactly one prefix length at which the tail check succeeds.
|
||||
*/
|
||||
private fun parseIncrementally(o: JSONObject): Pair<Obfs4Handshake.ParsedClient, Int>? {
|
||||
val wire = hex(o.getString("client_to_server"))
|
||||
for (n in Obfs4Handshake.CLIENT_MIN_HANDSHAKE_LENGTH..wire.size) {
|
||||
try {
|
||||
return Obfs4Handshake.parseClientMessage(
|
||||
wire.copyOfRange(0, n), key(o), o.getLong("epoch_hour")) to n
|
||||
} catch (_: Exception) { /* keep reading */ }
|
||||
}
|
||||
return null
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the server side parses real client handshakes`() {
|
||||
val v = vectors().getJSONArray("handshakes")
|
||||
assertTrue(v.length() > 8, "too few handshakes")
|
||||
val failures = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val parsed = parseIncrementally(o)
|
||||
if (parsed == null) { failures += "node ${o.getString("node_id").take(12)}…"; continue }
|
||||
val (p, n) = parsed
|
||||
assertEquals(n, p.consumed)
|
||||
assertTrue(p.padding.size >= Obfs4Handshake.CLIENT_MIN_PAD_LENGTH &&
|
||||
p.padding.size <= Obfs4Handshake.CLIENT_MAX_PAD_LENGTH,
|
||||
"padding ${p.padding.size} outside the permitted range")
|
||||
assertTrue(n < hex(o.getString("client_to_server")).size,
|
||||
"the handshake swallowed the traffic that followed it")
|
||||
}
|
||||
assertTrue(failures.isEmpty(), "${failures.size} never parsed: $failures")
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 The client must **substring-search**. The server sends framed data
|
||||
* immediately after its handshake, so the mark is not at the tail — a tail
|
||||
* check here fails against every real bridge, and these vectors contain
|
||||
* exactly that trailing data.
|
||||
*/
|
||||
@Test
|
||||
fun `the client side parses real server handshakes`() {
|
||||
val v = vectors().getJSONArray("handshakes")
|
||||
val failures = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val wire = hex(o.getString("server_to_client"))
|
||||
try {
|
||||
val p = Obfs4Handshake.parseServerMessage(wire, key(o), o.getLong("epoch_hour"))
|
||||
assertTrue(p.consumed < wire.size, "trailing frames consumed as handshake")
|
||||
assertEquals(32, p.auth.size)
|
||||
} catch (e: Exception) {
|
||||
failures += "node ${o.getString("node_id").take(12)}…: $e"
|
||||
}
|
||||
}
|
||||
assertTrue(failures.isEmpty(), "${failures.size} did not parse:\n" +
|
||||
failures.take(3).joinToString("\n"))
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 **The generation test.** Rebuilding from the values recovered by
|
||||
* parsing must reproduce lyrebird's bytes exactly — proving the mark, the
|
||||
* MAC, the field order and the decimal epoch encoding all match, not merely
|
||||
* that parsing is self-consistent.
|
||||
*/
|
||||
@Test
|
||||
fun `regenerating reproduces lyrebirds bytes`() {
|
||||
val v = vectors().getJSONArray("handshakes")
|
||||
var mismatches = 0
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val (p, n) = parseIncrementally(o) ?: continue
|
||||
val rebuilt = Obfs4Handshake.clientMessage(p.representative, p.padding, key(o), p.epochHour)
|
||||
if (!rebuilt.contentEquals(hex(o.getString("client_to_server")).copyOfRange(0, n))) {
|
||||
mismatches++
|
||||
}
|
||||
}
|
||||
assertEquals(0, mismatches, "$mismatches client handshakes did not regenerate")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `regenerating the server message reproduces lyrebirds bytes`() {
|
||||
val v = vectors().getJSONArray("handshakes")
|
||||
var mismatches = 0
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val wire = hex(o.getString("server_to_client"))
|
||||
val p = Obfs4Handshake.parseServerMessage(wire, key(o), o.getLong("epoch_hour"))
|
||||
val rebuilt = Obfs4Handshake.serverMessage(
|
||||
p.representative, p.auth, p.padding, key(o), o.getLong("epoch_hour"))
|
||||
if (!rebuilt.contentEquals(wire.copyOfRange(0, p.consumed))) mismatches++
|
||||
}
|
||||
assertEquals(0, mismatches, "$mismatches server handshakes did not regenerate")
|
||||
}
|
||||
|
||||
/** The server accepts the hour either side of its own, and nothing further. */
|
||||
@Test
|
||||
fun `the server tolerates one hour of clock skew and no more`() {
|
||||
val o = vectors().getJSONArray("handshakes").getJSONObject(0)
|
||||
val (_, n) = parseIncrementally(o)!!
|
||||
val msg = hex(o.getString("client_to_server")).copyOfRange(0, n)
|
||||
for (offset in listOf(-1L, 0L, 1L)) {
|
||||
Obfs4Handshake.parseClientMessage(msg, key(o), o.getLong("epoch_hour") + offset)
|
||||
}
|
||||
for (offset in listOf(-2L, 2L, 24L)) {
|
||||
assertFailsWith<Obfs4Handshake.MacMismatch>("skew of $offset hours must be refused") {
|
||||
Obfs4Handshake.parseClientMessage(msg, key(o), o.getLong("epoch_hour") + offset)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 A scanner without the bridge's public key cannot produce a valid mark.
|
||||
* This is the whole of obfs4's probe resistance.
|
||||
*/
|
||||
@Test
|
||||
fun `a wrong identity key never finds the mark`() {
|
||||
val o = vectors().getJSONArray("handshakes").getJSONObject(0)
|
||||
val wrong = hex(o.getString("server_public_key")).also { it[0] = (it[0].toInt() xor 1).toByte() }
|
||||
val badKey = Obfs4Handshake.macKey(wrong, hex(o.getString("node_id")))
|
||||
val wire = hex(o.getString("client_to_server"))
|
||||
for (n in Obfs4Handshake.CLIENT_MIN_HANDSHAKE_LENGTH..minOf(wire.size, 900)) {
|
||||
assertFailsWith<Exception> {
|
||||
Obfs4Handshake.parseClientMessage(wire.copyOfRange(0, n), badKey, o.getLong("epoch_hour"))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ `NeedMoreData` and `InvalidHandshake` are different answers: the first
|
||||
* keeps the connection open and silent, the second closes it. A lengthened
|
||||
* buffer reads as unfinished, which is the silence probe resistance depends
|
||||
* on.
|
||||
*/
|
||||
@Test
|
||||
fun `trailing bytes read as an unfinished handshake, not a rejection`() {
|
||||
val o = vectors().getJSONArray("handshakes").getJSONObject(0)
|
||||
val (_, n) = parseIncrementally(o)!!
|
||||
val valid = hex(o.getString("client_to_server")).copyOfRange(0, n)
|
||||
for (extra in listOf(1, 2, 64, 500)) {
|
||||
assertFailsWith<Obfs4Handshake.NeedMoreData>("$extra trailing bytes") {
|
||||
Obfs4Handshake.parseClientMessage(valid + ByteArray(extra) { 0x41 },
|
||||
key(o), o.getLong("epoch_hour"))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `short buffers ask for more rather than rejecting`() {
|
||||
val o = vectors().getJSONArray("handshakes").getJSONObject(0)
|
||||
assertFailsWith<Obfs4Handshake.NeedMoreData> {
|
||||
Obfs4Handshake.parseClientMessage(
|
||||
hex(o.getString("client_to_server")).copyOfRange(0, 10),
|
||||
key(o), o.getLong("epoch_hour"))
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* The padding floor exists so a client handshake is never shorter than a
|
||||
* server one — otherwise direction is readable from length alone.
|
||||
*/
|
||||
@Test
|
||||
fun `the client padding floor covers the server handshake`() {
|
||||
assertTrue(
|
||||
Obfs4Handshake.CLIENT_MIN_HANDSHAKE_LENGTH + Obfs4Handshake.CLIENT_MIN_PAD_LENGTH >=
|
||||
Obfs4Handshake.SERVER_MIN_HANDSHAKE_LENGTH + Obfs4Handshake.INLINE_SEED_FRAME_LENGTH)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,229 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import java.io.File
|
||||
import java.net.InetSocketAddress
|
||||
import java.net.ServerSocket
|
||||
import java.net.Socket
|
||||
import java.net.SocketTimeoutException
|
||||
import java.security.SecureRandom
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* Handshakes against a **real lyrebird bridge**, and a real lyrebird client
|
||||
* against this one.
|
||||
*
|
||||
* 🔴 **These are the only tests here that prove interoperability.** Everything
|
||||
* else compares against recorded reference output or against itself, and a
|
||||
* Kotlin-to-Kotlin test cannot catch a mistake both ends share — two
|
||||
* identically-wrong implementations agree perfectly. Here the counterparty is
|
||||
* the Tor Project's own code, deciding for itself whether to answer.
|
||||
*
|
||||
* ⚠️ **A bug shows up as SILENCE, not an error.** obfs4 is probe-resistant: a
|
||||
* bridge that dislikes a handshake says nothing at all. So every read has a
|
||||
* timeout and a timeout is reported as *"the bridge refused to answer"* — the
|
||||
* one diagnosis that is actually true — rather than as a network fault.
|
||||
*
|
||||
* ⚠️ **Both directions are needed.** Swapping the framing key halves by role is
|
||||
* fatal for a server and leaves the client test green, because a client takes
|
||||
* the first half either way. Only the reverse direction catches it.
|
||||
*
|
||||
* Run with `scripts/obfs4-interop.sh`, which builds and starts the counterparty.
|
||||
*/
|
||||
class InteropTest {
|
||||
|
||||
private val random = SecureRandom()
|
||||
|
||||
/**
|
||||
* 🔴 **Never skips quietly.** A silent skip is how a suite reports success
|
||||
* for a test that has not run in months. Absent configuration is a hard
|
||||
* failure unless the environment explicitly opts out, which forces the
|
||||
* decision to be visible in the runner rather than buried here.
|
||||
*/
|
||||
private fun env(name: String): String? {
|
||||
System.getenv(name)?.let { return it }
|
||||
if (System.getenv("OBFS4_INTEROP_OPTOUT") == "1") return null
|
||||
throw AssertionError(
|
||||
"$name is not set and OBFS4_INTEROP_OPTOUT=1 was not given either. " +
|
||||
"Run scripts/obfs4-interop.sh, or opt out explicitly.")
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
private fun representableKeypair(): Triple<ByteArray, ByteArray, ByteArray> {
|
||||
// 🔴 Retried with FRESH entropy, never by re-tweaking a key that had no
|
||||
// representative: representability is a property of the key, so
|
||||
// retrying the same one differently would bias which keys get used.
|
||||
var attempts = 0
|
||||
while (true) {
|
||||
attempts++
|
||||
val candidate = ByteArray(32).also { random.nextBytes(it) }
|
||||
val pub = Ladder.dirtyPublicKey(candidate)
|
||||
val tweak = random.nextInt(256)
|
||||
val repr = Elligator2.representativeForPublicKey(pub, tweak)
|
||||
if (repr != null) return Triple(candidate, pub, repr)
|
||||
assertTrue(attempts < 100, "representable keys should arrive in a few tries")
|
||||
}
|
||||
}
|
||||
|
||||
private fun readSome(socket: Socket, stage: String): ByteArray {
|
||||
val buf = ByteArray(16384)
|
||||
val n = try { socket.getInputStream().read(buf) } catch (e: SocketTimeoutException) { -1 }
|
||||
if (n <= 0) throw AssertionError(
|
||||
"the bridge refused to answer during $stage. obfs4 bridges stay silent when a " +
|
||||
"handshake is invalid, so this is what a wire-format bug looks like — not a " +
|
||||
"network fault.")
|
||||
return buf.copyOfRange(0, n)
|
||||
}
|
||||
|
||||
// MARK: - Kotlin client → real lyrebird bridge
|
||||
|
||||
@Test
|
||||
fun `a handshake and an echo against a real lyrebird bridge`() {
|
||||
val paramsPath = env("OBFS4_INTEROP_PARAMS") ?: return
|
||||
val params = JSONObject(File(paramsPath).readText())
|
||||
val nodeId = hex(params.getString("node_id"))
|
||||
val identity = hex(params.getString("public_key"))
|
||||
val address = params.getString("address").split(":")
|
||||
|
||||
val (priv, pub, repr) = representableKeypair()
|
||||
val handshake = Obfs4ClientHandshake(
|
||||
nodeId, identity, priv, pub, repr, Obfs4Handshake.currentEpochHour())
|
||||
|
||||
val padLength = Obfs4Handshake.CLIENT_MIN_PAD_LENGTH + random.nextInt(500)
|
||||
val padding = ByteArray(padLength).also { random.nextBytes(it) }
|
||||
|
||||
Socket().use { socket ->
|
||||
socket.connect(InetSocketAddress(address[0], address[1].toInt()), 8000)
|
||||
// ⚠️ Without a read timeout a rejected handshake hangs the suite
|
||||
// forever, because the bridge's correct behaviour is to say nothing.
|
||||
socket.soTimeout = 8000
|
||||
socket.getOutputStream().write(handshake.opening(padding))
|
||||
socket.getOutputStream().flush()
|
||||
|
||||
var established: Obfs4ClientHandshake.Established? = null
|
||||
for (i in 0 until 8) {
|
||||
established = handshake.receive(readSome(socket, "the server handshake"))
|
||||
if (established != null) break
|
||||
}
|
||||
assertNotNull(established, "the bridge never completed its handshake")
|
||||
|
||||
val keys = Obfs4Session.directionKeys(established.keySeed, isClient = true)
|
||||
val plane = Obfs4DataPlane(keys.first, keys.second)
|
||||
// ⚠️ Whatever followed the handshake in the same read is already
|
||||
// framed traffic — usually the bridge's PRNG seed. Dropping it
|
||||
// desynchronises the frame decoder immediately.
|
||||
plane.receive(established.leftover, isClient = true)
|
||||
|
||||
val message = "flamenet obfs4 kotlin interop".toByteArray()
|
||||
socket.getOutputStream().write(plane.send(message, 97))
|
||||
socket.getOutputStream().flush()
|
||||
|
||||
var echoed = ByteArray(0)
|
||||
for (i in 0 until 8) {
|
||||
if (echoed.size >= message.size) break
|
||||
echoed += plane.receive(readSome(socket, "the echo"), isClient = true)
|
||||
}
|
||||
assertEquals(hex(message), hex(echoed),
|
||||
"the bridge accepted the handshake but the data plane disagreed")
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ The mirror image: a handshake the bridge should refuse. It must go
|
||||
* silent rather than answer, which is what probe resistance means.
|
||||
*/
|
||||
@Test
|
||||
fun `a bridge ignores a handshake it cannot verify`() {
|
||||
val paramsPath = env("OBFS4_INTEROP_PARAMS") ?: return
|
||||
val params = JSONObject(File(paramsPath).readText())
|
||||
val address = params.getString("address").split(":")
|
||||
|
||||
Socket().use { socket ->
|
||||
socket.connect(InetSocketAddress(address[0], address[1].toInt()), 8000)
|
||||
socket.soTimeout = 6000
|
||||
socket.getOutputStream().write(ByteArray(700).also { random.nextBytes(it) })
|
||||
socket.getOutputStream().flush()
|
||||
val n = try { socket.getInputStream().read(ByteArray(1024)) }
|
||||
catch (e: SocketTimeoutException) { -1 }
|
||||
assertTrue(n <= 0,
|
||||
"the bridge replied to an invalid handshake with $n bytes. A bridge that " +
|
||||
"answers unverified clients is one a scanner can confirm exists.")
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: - Real lyrebird client → Kotlin bridge
|
||||
|
||||
/**
|
||||
* 🔴 **The only thing that can prove the server role.** The client test
|
||||
* stays green through bugs that are fatal for a server.
|
||||
*/
|
||||
@Test
|
||||
fun `a real lyrebird client accepts the kotlin bridge`() {
|
||||
val clientPath = env("OBFS4_INTEROP_CLIENT") ?: return
|
||||
|
||||
val identityPrivate = ByteArray(32).also { random.nextBytes(it) }
|
||||
// ⚠️ CLEAN, not dirty. Only session keys keep their cofactor, because
|
||||
// only those travel as representatives.
|
||||
val identityPublic = Ladder.publicKey(identityPrivate)
|
||||
val nodeId = ByteArray(20).also { random.nextBytes(it) }
|
||||
val (sessionPriv, sessionPub, sessionRepr) = representableKeypair()
|
||||
val filter = ReplayFilter()
|
||||
|
||||
ServerSocket(0, 4, java.net.InetAddress.getByName("127.0.0.1")).use { listener ->
|
||||
val cert = java.util.Base64.getEncoder()
|
||||
.encodeToString(nodeId + identityPublic).dropLast(2)
|
||||
val message = "kotlin bridge, real client"
|
||||
val process = ProcessBuilder(
|
||||
clientPath, "-address", "127.0.0.1:${listener.localPort}",
|
||||
"-cert", cert, "-message", message,
|
||||
).redirectErrorStream(true).start()
|
||||
|
||||
listener.accept().use { conn ->
|
||||
conn.soTimeout = 15000
|
||||
val handshake = Obfs4ServerHandshake(
|
||||
nodeId, identityPrivate, identityPublic,
|
||||
sessionPriv, sessionPub, sessionRepr, Obfs4Handshake.currentEpochHour())
|
||||
val padding = ByteArray(random.nextInt(400)).also { random.nextBytes(it) }
|
||||
|
||||
var accepted: Obfs4ServerHandshake.Accepted? = null
|
||||
for (i in 0 until 8) {
|
||||
val chunk = readSome(conn, "the client handshake")
|
||||
accepted = handshake.receive(chunk, padding, filter)
|
||||
if (accepted != null) break
|
||||
}
|
||||
assertNotNull(accepted, "the Kotlin bridge never accepted the client's handshake")
|
||||
|
||||
conn.getOutputStream().write(accepted.reply)
|
||||
val keys = Obfs4Session.directionKeys(accepted.keySeed, isClient = false)
|
||||
val plane = Obfs4DataPlane(keys.first, keys.second)
|
||||
// Faithful to the reference: a bridge's first frame hands the
|
||||
// client a seed so both ends pad from the same distribution.
|
||||
conn.getOutputStream().write(
|
||||
plane.sendPrngSeed(ByteArray(24).also { random.nextBytes(it) }))
|
||||
conn.getOutputStream().flush()
|
||||
|
||||
var echoed = 0
|
||||
while (echoed < message.length) {
|
||||
val payload = plane.receive(readSome(conn, "the client's traffic"),
|
||||
isClient = false)
|
||||
if (payload.isNotEmpty()) {
|
||||
conn.getOutputStream().write(plane.send(payload, 63))
|
||||
conn.getOutputStream().flush()
|
||||
echoed += payload.size
|
||||
}
|
||||
}
|
||||
assertEquals(message.length, echoed, "the bridge did not echo the whole message")
|
||||
}
|
||||
|
||||
val output = process.inputStream.readBytes().decodeToString()
|
||||
assertEquals(0, process.waitFor(), "lyrebird rejected the Kotlin bridge:\n$output")
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,128 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* Cofactor-dirty scalar base multiplication, against lyrebird.
|
||||
*
|
||||
* 🔴 **The wrong answer sits right next to the right one.** The clean X25519
|
||||
* public key — what every library computes — is a perfectly good Curve25519
|
||||
* key. It agrees on shared secrets. It round-trips. It is simply confined to
|
||||
* the prime-order subgroup and therefore *distinguishable*, which defeats the
|
||||
* entire purpose. Clamping the private key before the call is all it takes to
|
||||
* get one, so this checks structure as well as bytes.
|
||||
*/
|
||||
class LadderTest {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("elligator-vectors.json")
|
||||
assertNotNull(stream, "the vectors are missing from test resources")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
/**
|
||||
* ⚠️ The `private` field is the 32 bytes lyrebird actually fed to
|
||||
* `ScalarBaseMult` — already past its SHA-512 pass, and *not* clamped.
|
||||
* Clamping before this call would clear the cofactor and quietly turn this
|
||||
* into the clean function.
|
||||
*/
|
||||
@Test
|
||||
fun `the dirty public key matches lyrebird`() {
|
||||
val keygen = vectors().getJSONArray("keygen")
|
||||
assertTrue(keygen.length() > 100, "too few vectors to mean anything")
|
||||
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until keygen.length()) {
|
||||
val v = keygen.getJSONObject(i)
|
||||
val got = Ladder.dirtyPublicKey(hex(v.getString("private")))
|
||||
if (hex(got) != v.getString("public")) {
|
||||
mismatches += "private ${v.getString("private")}\n" +
|
||||
" want ${v.getString("public")}\n got ${hex(got)}"
|
||||
}
|
||||
}
|
||||
assertTrue(
|
||||
mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${keygen.length()} private keys produced the wrong " +
|
||||
"public key.\n\n${mismatches.take(2).joinToString("\n")}",
|
||||
)
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 The structural check. If the cofactor were being cleared this would be
|
||||
* the clean key, so it must differ from the clean key exactly when the low
|
||||
* three bits of the private key are non-zero, and match it exactly when
|
||||
* they are not.
|
||||
*/
|
||||
@Test
|
||||
fun `it differs from the clean key exactly when the cofactor is set`() {
|
||||
val keygen = vectors().getJSONArray("keygen")
|
||||
val wrong = mutableListOf<String>()
|
||||
var withCofactor = 0
|
||||
var without = 0
|
||||
|
||||
for (i in 0 until keygen.length()) {
|
||||
val priv = hex(keygen.getJSONObject(i).getString("private"))
|
||||
val dirty = Ladder.dirtyPublicKey(priv)
|
||||
val clean = Ladder.publicKey(priv)
|
||||
if ((priv[0].toInt() and 7) != 0) {
|
||||
withCofactor++
|
||||
if (dirty.contentEquals(clean)) wrong += "cofactor set but the key is clean"
|
||||
} else {
|
||||
without++
|
||||
if (!dirty.contentEquals(clean)) wrong += "no cofactor but the keys differ"
|
||||
}
|
||||
}
|
||||
assertTrue(wrong.isEmpty(), "${wrong.size} keys had the wrong relationship to the clean key")
|
||||
// ⚠️ Both arms must actually occur, or the assertion above is vacuous
|
||||
// for one of them.
|
||||
assertTrue(withCofactor > 10, "no keys with a cofactor component")
|
||||
assertTrue(without > 10, "no keys without a cofactor component")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the whole keypair matches lyrebird end to end`() {
|
||||
val keygen = vectors().getJSONArray("keygen")
|
||||
var mismatches = 0
|
||||
for (i in 0 until keygen.length()) {
|
||||
val v = keygen.getJSONObject(i)
|
||||
val pub = Ladder.dirtyPublicKey(hex(v.getString("private")))
|
||||
val want = hex(v.getString("representative"))
|
||||
.also { it[31] = (it[31].toInt() and 0x3f).toByte() }
|
||||
val matched = listOf(0, 1).any { tweak ->
|
||||
Elligator2.representativeForPublicKey(pub, tweak)
|
||||
?.also { it[31] = (it[31].toInt() and 0x3f).toByte() }
|
||||
?.contentEquals(want) == true
|
||||
}
|
||||
if (!matched || hex(pub) != v.getString("public")) mismatches++
|
||||
}
|
||||
assertEquals(0, mismatches, "$mismatches keypairs did not match lyrebird end to end")
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `trimScalar clamps the standard bits`() {
|
||||
val all = ByteArray(32) { 0xff.toByte() }
|
||||
val t = Ladder.trimScalar(all)
|
||||
assertEquals(0xf8, t[0].toInt() and 0xff, "the low three bits must be cleared")
|
||||
assertEquals(0x7f, t[31].toInt() and 0xff, "bit 255 cleared and bit 254 set")
|
||||
assertEquals(0x40, Ladder.trimScalar(ByteArray(32))[31].toInt() and 0xff)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `adding the group order is driven by the low three bits`() {
|
||||
val s = ByteArray(32) { 0x11 }
|
||||
assertTrue(Ladder.addGroupOrderTimes(0xf8, s).contentEquals(s),
|
||||
"low three bits clear must leave the scalar alone")
|
||||
for (x in 1..7) {
|
||||
assertTrue(!Ladder.addGroupOrderTimes(x, s).contentEquals(s), "x=$x must change it")
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,149 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertFalse
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* The ntor handshake, against lyrebird, from both sides.
|
||||
*
|
||||
* 🔴 **This is the suite that decides whether the port can talk to a real
|
||||
* bridge.** Everything below it can be right while this is wrong: the maps
|
||||
* round-trip, the keys are correct, and the handshake still derives a KEY_SEED
|
||||
* no bridge in the world shares. obfs4 orders its transcript
|
||||
* `B | B | X | Y | PROTOID | ID` — `B` twice — while the comment immediately
|
||||
* above it in the reference claims `ID | B | Y | X | PROTOID`. Both orderings
|
||||
* produce a well-formed 32-byte result. Only one interoperates.
|
||||
*/
|
||||
class NtorTest {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("elligator-vectors.json")
|
||||
assertNotNull(stream, "the vectors are missing from test resources")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
@Test
|
||||
fun `the client handshake matches lyrebird`() {
|
||||
val v = vectors().getJSONArray("ntor")
|
||||
assertTrue(v.length() > 30, "too few handshakes to mean anything")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val r = Ntor.clientHandshake(
|
||||
hex(o.getString("client_private")), hex(o.getString("client_public")),
|
||||
hex(o.getString("server_public")), hex(o.getString("id_public")),
|
||||
hex(o.getString("node_id")),
|
||||
)
|
||||
if (r == null) { mismatches += "node ${o.getString("node_id")}: refused"; continue }
|
||||
if (hex(r.keySeed) != o.getString("key_seed")) {
|
||||
mismatches += "node ${o.getString("node_id")} KEY_SEED\n" +
|
||||
" want ${o.getString("key_seed")}\n got ${hex(r.keySeed)}"
|
||||
}
|
||||
if (hex(r.auth) != o.getString("auth")) mismatches += "AUTH mismatch"
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${v.length()} client handshakes disagreed:\n" +
|
||||
mismatches.take(2).joinToString("\n"))
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the server handshake matches lyrebird`() {
|
||||
val v = vectors().getJSONArray("ntor")
|
||||
var mismatches = 0
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val r = Ntor.serverHandshake(
|
||||
hex(o.getString("client_public")),
|
||||
hex(o.getString("server_private")), hex(o.getString("server_public")),
|
||||
hex(o.getString("id_private")), hex(o.getString("id_public")),
|
||||
hex(o.getString("node_id")),
|
||||
)
|
||||
if (r == null || hex(r.keySeed) != o.getString("key_seed") ||
|
||||
hex(r.auth) != o.getString("auth")
|
||||
) mismatches++
|
||||
}
|
||||
assertEquals(0, mismatches, "$mismatches server handshakes disagreed with lyrebird")
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ Both sides agreeing with each other is **not** the same as either being
|
||||
* right — two identically-wrong implementations agree perfectly. This runs
|
||||
* alongside the reference comparisons, never instead of them.
|
||||
*/
|
||||
@Test
|
||||
fun `the two sides agree with each other`() {
|
||||
val v = vectors().getJSONArray("ntor")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val c = Ntor.clientHandshake(
|
||||
hex(o.getString("client_private")), hex(o.getString("client_public")),
|
||||
hex(o.getString("server_public")), hex(o.getString("id_public")),
|
||||
hex(o.getString("node_id")))
|
||||
val s = Ntor.serverHandshake(
|
||||
hex(o.getString("client_public")),
|
||||
hex(o.getString("server_private")), hex(o.getString("server_public")),
|
||||
hex(o.getString("id_private")), hex(o.getString("id_public")),
|
||||
hex(o.getString("node_id")))
|
||||
assertNotNull(c); assertEquals(c, s, "the two sides disagreed")
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the kdf matches lyrebird`() {
|
||||
val v = vectors().getJSONArray("ntor")
|
||||
var mismatches = 0
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
if (hex(Ntor.kdf(hex(o.getString("key_seed")), 72)) != o.getString("okm")) mismatches++
|
||||
}
|
||||
assertEquals(0, mismatches, "$mismatches KDF outputs disagreed with lyrebird")
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 A peer that sends a low-order point drives every shared secret to zero.
|
||||
* Keying from that is keying from a value the attacker chose.
|
||||
*/
|
||||
@Test
|
||||
fun `low order points are rejected`() {
|
||||
val o = vectors().getJSONArray("ntor").getJSONObject(0)
|
||||
val identity = ByteArray(32)
|
||||
assertNull(Ntor.clientHandshake(
|
||||
hex(o.getString("client_private")), hex(o.getString("client_public")),
|
||||
identity, hex(o.getString("id_public")), hex(o.getString("node_id"))),
|
||||
"a zero server key must be refused")
|
||||
assertNull(Ntor.serverHandshake(
|
||||
identity, hex(o.getString("server_private")), hex(o.getString("server_public")),
|
||||
hex(o.getString("id_private")), hex(o.getString("id_public")),
|
||||
hex(o.getString("node_id"))),
|
||||
"a zero client key must be refused")
|
||||
}
|
||||
|
||||
/**
|
||||
* ⚠️ `clientPublic` and `nodeId` do not affect the shared secrets at all —
|
||||
* they enter only through the transcript. If the suffix were built wrongly
|
||||
* they could vanish without any other test noticing.
|
||||
*/
|
||||
@Test
|
||||
fun `every input is bound into the transcript`() {
|
||||
val o = vectors().getJSONArray("ntor").getJSONObject(0)
|
||||
fun run(pub: ByteArray, id: ByteArray) = Ntor.clientHandshake(
|
||||
hex(o.getString("client_private")), pub,
|
||||
hex(o.getString("server_public")), hex(o.getString("id_public")), id)
|
||||
|
||||
val base = run(hex(o.getString("client_public")), hex(o.getString("node_id")))
|
||||
val otherPub = hex(o.getString("client_public")).also { it[0] = (it[0].toInt() xor 1).toByte() }
|
||||
val otherId = hex(o.getString("node_id")).also { it[0] = (it[0].toInt() xor 1).toByte() }
|
||||
assertFalse(base == run(otherPub, hex(o.getString("node_id"))), "X is not bound in")
|
||||
assertFalse(base == run(hex(o.getString("client_public")), otherId), "node ID is not bound in")
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,107 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import org.json.JSONObject
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* SipHash-2-4 and the DRBG, against the same vectors the Swift port uses.
|
||||
*
|
||||
* 🔴 **Hand-written crypto without vectors is indefensible.** A subtly wrong
|
||||
* hash produces well-distributed output that passes every statistical glance
|
||||
* and matches nobody.
|
||||
*/
|
||||
class SipHashTest {
|
||||
|
||||
private fun vectors(): JSONObject {
|
||||
val stream = javaClass.classLoader.getResourceAsStream("framing-vectors.json")
|
||||
assertNotNull(stream, "the framing vectors are missing from test resources")
|
||||
return JSONObject(stream.readBytes().decodeToString())
|
||||
}
|
||||
|
||||
private fun hex(s: String) = ByteArray(s.length / 2) {
|
||||
s.substring(it * 2, it * 2 + 2).toInt(16).toByte()
|
||||
}
|
||||
private fun hex(b: ByteArray) = b.joinToString("") { "%02x".format(it) }
|
||||
|
||||
/**
|
||||
* ⚠️ The vector lengths straddle the 8-byte block boundary and the final
|
||||
* partial block on purpose — that is where a padding mistake hides, and a
|
||||
* suite of round-numbered lengths would miss it entirely.
|
||||
*/
|
||||
@Test
|
||||
fun `siphash matches the reference`() {
|
||||
val v = vectors().getJSONArray("siphash")
|
||||
assertTrue(v.length() > 8, "too few lengths covered")
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val got = SipHash24.hash(hex(o.getString("key")), hex(o.getString("input")))
|
||||
if (hex(got) != o.getString("sum")) {
|
||||
mismatches += "len ${o.getString("input").length / 2}: " +
|
||||
"want ${o.getString("sum")} got ${hex(got)}"
|
||||
}
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} of ${v.length()} results wrong:\n" +
|
||||
mismatches.take(4).joinToString("\n"))
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `feeding a message in pieces equals feeding it whole`() {
|
||||
val v = vectors().getJSONArray("siphash")
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val msg = hex(o.getString("input"))
|
||||
if (msg.isEmpty()) continue
|
||||
val h = SipHash24(hex(o.getString("key")))
|
||||
for (b in msg) h.update(byteArrayOf(b))
|
||||
assertEquals(o.getString("sum"), hex(h.sumBytes()),
|
||||
"byte-at-a-time disagreed for a ${msg.size}-byte input")
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 **The test that catches the reference's own documentation.** obfs4's
|
||||
* comment says each block is a fresh `H(K, previous)`; the code never resets
|
||||
* the hash, so blocks are cumulative. The two agree on block one and diverge
|
||||
* afterwards, so ten blocks are checked, not one.
|
||||
*/
|
||||
@Test
|
||||
fun `the drbg is cumulative not reset`() {
|
||||
val v = vectors().getJSONArray("drbg")
|
||||
assertTrue(v.getJSONObject(0).getJSONArray("blocks").length() > 5,
|
||||
"one block would not distinguish the two readings")
|
||||
|
||||
val mismatches = mutableListOf<String>()
|
||||
for (i in 0 until v.length()) {
|
||||
val o = v.getJSONObject(i)
|
||||
val drbg = LengthDrbg(hex(o.getString("seed")))
|
||||
val blocks = o.getJSONArray("blocks")
|
||||
for (j in 0 until blocks.length()) {
|
||||
val got = hex(drbg.nextBlock())
|
||||
if (got != blocks.getString(j)) {
|
||||
mismatches += "seed ${o.getString("seed").take(16)}… block $j: " +
|
||||
"want ${blocks.getString(j)} got $got"
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
assertTrue(mismatches.isEmpty(),
|
||||
"${mismatches.size} DRBG streams diverged. A failure at block 0 means " +
|
||||
"SipHash is wrong; at block 1 the hash is being reset between blocks.\n" +
|
||||
mismatches.take(3).joinToString("\n"))
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `the length mask is the big-endian head of the block`() {
|
||||
val o = vectors().getJSONArray("drbg").getJSONObject(0)
|
||||
val a = LengthDrbg(hex(o.getString("seed")))
|
||||
val b = LengthDrbg(hex(o.getString("seed")))
|
||||
val block = a.nextBlock()
|
||||
assertEquals(((block[0].toInt() and 0xff) shl 8) or (block[1].toInt() and 0xff),
|
||||
b.nextLengthMask())
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,191 @@
|
||||
package io.flamenet.obfs4
|
||||
|
||||
import com.sun.net.httpserver.HttpServer
|
||||
import java.net.InetSocketAddress
|
||||
import java.net.ServerSocket
|
||||
import java.net.Socket
|
||||
import java.security.SecureRandom
|
||||
import kotlin.concurrent.thread
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertTrue
|
||||
import kotlin.test.fail
|
||||
|
||||
/**
|
||||
* A real HTTP request carried inside obfs4, end to end.
|
||||
*
|
||||
* ⚠️ **This tests the PLUMBING, not the wire format.** The protocol is already
|
||||
* pinned to real lyrebird in both directions by `InteropTest`; what is unproven
|
||||
* until here is the `SocketFactory` and stream wiring — that the handshake
|
||||
* happens before any stream is handed out, that the bytes arriving with the
|
||||
* handshake are not dropped, and that a frame decoding to nothing does not look
|
||||
* like end-of-stream. Those are the places to lose data without producing a
|
||||
* wrong byte anywhere.
|
||||
*
|
||||
* So both ends here are ours, and that is deliberate rather than a shortcut.
|
||||
*/
|
||||
class SocketFactoryTest {
|
||||
|
||||
private val random = SecureRandom()
|
||||
|
||||
private fun representableKeypair(): Triple<ByteArray, ByteArray, ByteArray> {
|
||||
while (true) {
|
||||
val candidate = ByteArray(32).also { random.nextBytes(it) }
|
||||
val pub = Ladder.dirtyPublicKey(candidate)
|
||||
val repr = Elligator2.representativeForPublicKey(pub, random.nextInt(256))
|
||||
if (repr != null) return Triple(candidate, pub, repr)
|
||||
}
|
||||
}
|
||||
|
||||
/** A minimal obfs4 bridge that proxies plaintext to `upstreamPort`. */
|
||||
private fun startBridge(upstreamPort: Int): Triple<Obfs4Bridge, ServerSocket, Thread> {
|
||||
val identityPrivate = ByteArray(32).also { random.nextBytes(it) }
|
||||
val identityPublic = Ladder.publicKey(identityPrivate)
|
||||
val nodeId = ByteArray(20).also { random.nextBytes(it) }
|
||||
val listener = ServerSocket(0, 8, java.net.InetAddress.getByName("127.0.0.1"))
|
||||
val filter = ReplayFilter()
|
||||
|
||||
val worker = thread(isDaemon = true) {
|
||||
while (!listener.isClosed) {
|
||||
val conn = try { listener.accept() } catch (e: Exception) { return@thread }
|
||||
thread(isDaemon = true) { serve(conn, nodeId, identityPrivate, identityPublic, filter, upstreamPort) }
|
||||
}
|
||||
}
|
||||
return Triple(Obfs4Bridge("127.0.0.1", listener.localPort, nodeId, identityPublic),
|
||||
listener, worker)
|
||||
}
|
||||
|
||||
private fun serve(
|
||||
conn: Socket, nodeId: ByteArray, identityPrivate: ByteArray, identityPublic: ByteArray,
|
||||
filter: ReplayFilter, upstreamPort: Int,
|
||||
) {
|
||||
conn.use {
|
||||
conn.soTimeout = 15000
|
||||
val (sessionPriv, sessionPub, sessionRepr) = representableKeypair()
|
||||
val handshake = Obfs4ServerHandshake(
|
||||
nodeId, identityPrivate, identityPublic,
|
||||
sessionPriv, sessionPub, sessionRepr, Obfs4Handshake.currentEpochHour())
|
||||
|
||||
val buf = ByteArray(16384)
|
||||
var accepted: Obfs4ServerHandshake.Accepted? = null
|
||||
for (i in 0 until 16) {
|
||||
val n = conn.getInputStream().read(buf)
|
||||
if (n <= 0) return
|
||||
accepted = handshake.receive(buf.copyOfRange(0, n), ByteArray(0), filter)
|
||||
if (accepted != null) break
|
||||
}
|
||||
val session = accepted ?: return // 🔴 Silent. No reply, no close reason.
|
||||
|
||||
conn.getOutputStream().write(session.reply)
|
||||
conn.getOutputStream().flush()
|
||||
val keys = Obfs4Session.directionKeys(session.keySeed, isClient = false)
|
||||
val plane = Obfs4DataPlane(keys.first, keys.second)
|
||||
|
||||
Socket("127.0.0.1", upstreamPort).use { upstream ->
|
||||
thread(isDaemon = true) {
|
||||
val up = ByteArray(16384)
|
||||
try {
|
||||
while (true) {
|
||||
val n = upstream.getInputStream().read(up)
|
||||
if (n <= 0) break
|
||||
conn.getOutputStream().write(plane.send(up.copyOfRange(0, n)))
|
||||
conn.getOutputStream().flush()
|
||||
}
|
||||
} catch (_: Exception) { }
|
||||
try { conn.close() } catch (_: Exception) { }
|
||||
}
|
||||
try {
|
||||
while (true) {
|
||||
val n = conn.getInputStream().read(buf)
|
||||
if (n <= 0) break
|
||||
val payload = plane.receive(buf.copyOfRange(0, n), isClient = false)
|
||||
if (payload.isNotEmpty()) {
|
||||
upstream.getOutputStream().write(payload)
|
||||
upstream.getOutputStream().flush()
|
||||
}
|
||||
}
|
||||
} catch (_: Exception) { }
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `an http request travels through obfs4 end to end`() {
|
||||
val body = "hello from behind the bridge"
|
||||
val http = HttpServer.create(InetSocketAddress("127.0.0.1", 0), 0)
|
||||
http.createContext("/probe") { exchange ->
|
||||
val bytes = body.toByteArray()
|
||||
exchange.sendResponseHeaders(200, bytes.size.toLong())
|
||||
exchange.responseBody.use { it.write(bytes) }
|
||||
}
|
||||
http.start()
|
||||
|
||||
val (bridge, listener, _) = startBridge(http.address.port)
|
||||
try {
|
||||
val client = okhttp3.OkHttpClient.Builder()
|
||||
.socketFactory(Obfs4SocketFactory(bridge))
|
||||
.callTimeout(30, java.util.concurrent.TimeUnit.SECONDS)
|
||||
.build()
|
||||
|
||||
// ⚠️ The URL is the RELAY's address. The socket factory ignores it
|
||||
// and dials the bridge — which is the whole point, and the thing
|
||||
// that would silently not happen if the factory were bypassed.
|
||||
val request = okhttp3.Request.Builder()
|
||||
.url("http://127.0.0.1:${http.address.port}/probe")
|
||||
.build()
|
||||
client.newCall(request).execute().use { response ->
|
||||
assertEquals(200, response.code)
|
||||
assertEquals(body, response.body?.string())
|
||||
}
|
||||
} finally {
|
||||
listener.close()
|
||||
http.stop(0)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 🔴 A wrong bridge key must fail as a refusal, not hang forever. obfs4
|
||||
* bridges stay silent for anyone they cannot verify, so without a timeout
|
||||
* this is an app that never finishes a request.
|
||||
*/
|
||||
@Test
|
||||
fun `a wrong bridge key fails rather than hanging`() {
|
||||
val http = HttpServer.create(InetSocketAddress("127.0.0.1", 0), 0)
|
||||
http.createContext("/probe") { it.sendResponseHeaders(200, -1); it.close() }
|
||||
http.start()
|
||||
val (bridge, listener, _) = startBridge(http.address.port)
|
||||
try {
|
||||
val wrong = bridge.copy(
|
||||
identityPublic = bridge.identityPublic.copyOf().also { it[0] = (it[0].toInt() xor 1).toByte() })
|
||||
val socket = Obfs4Socket(wrong)
|
||||
socket.soTimeout = 4000
|
||||
try {
|
||||
socket.connect(InetSocketAddress("127.0.0.1", http.address.port), 4000)
|
||||
fail("a wrong bridge key must not produce a usable socket")
|
||||
} catch (e: Exception) {
|
||||
assertTrue(e is Obfs4HandshakeRefused || e is java.io.IOException,
|
||||
"expected a refusal, got ${e::class.simpleName}: ${e.message}")
|
||||
} finally { socket.close() }
|
||||
} finally {
|
||||
listener.close()
|
||||
http.stop(0)
|
||||
}
|
||||
}
|
||||
|
||||
/** Every `createSocket` overload must produce an obfs4 socket. */
|
||||
@Test
|
||||
fun `no socket factory overload silently bypasses the transport`() {
|
||||
val bridge = Obfs4Bridge("127.0.0.1", 1, ByteArray(20), ByteArray(32) { 1 })
|
||||
assertTrue(Obfs4SocketFactory(bridge).createSocket() is Obfs4Socket)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun `a bridge line cert round trips`() {
|
||||
val nodeId = ByteArray(20) { it.toByte() }
|
||||
val key = ByteArray(32) { (it * 3).toByte() }
|
||||
val cert = java.util.Base64.getEncoder().encodeToString(nodeId + key).dropLast(2)
|
||||
val parsed = Obfs4Bridge.fromCert("example.org", 443, cert)
|
||||
assertTrue(parsed.nodeId.contentEquals(nodeId))
|
||||
assertTrue(parsed.identityPublic.contentEquals(key))
|
||||
}
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,482 @@
|
||||
{
|
||||
"note": "obfs4 framing: SipHash-2-4 length obfuscation over a cumulative OFB DRBG, and XSalsa20-Poly1305 secretbox frames with a 16-byte nonce prefix and a big-endian counter starting at 1.",
|
||||
"siphash": [
|
||||
{
|
||||
"key": "b04d16fdfe8574916b589ba986d39ead",
|
||||
"input": "",
|
||||
"sum": "f02cd7391a4e8482"
|
||||
},
|
||||
{
|
||||
"key": "80505c71c137d1b13c011d182a4860ae",
|
||||
"input": "ec",
|
||||
"sum": "e8b411ea3dc8187e"
|
||||
},
|
||||
{
|
||||
"key": "500baa04b52ca9b9af0cdd912893bc79",
|
||||
"input": "93544421dd5989",
|
||||
"sum": "49ea85824bf537f1"
|
||||
},
|
||||
{
|
||||
"key": "dc7f09648a17ab77e83fc01a107ce009",
|
||||
"input": "83ae9aabb12e2379",
|
||||
"sum": "86fa1a2909bae3fd"
|
||||
},
|
||||
{
|
||||
"key": "55965420738db0ca2d1c6cdf1b2787f0",
|
||||
"input": "5af9ebbfa59fc44d57",
|
||||
"sum": "4b9a983a5d2b563d"
|
||||
},
|
||||
{
|
||||
"key": "6475728d56fe9de5b41a3f88f8ff8dde",
|
||||
"input": "1261e27b1dee4aad4c6338e8c18d17",
|
||||
"sum": "abac7dbd4a176cff"
|
||||
},
|
||||
{
|
||||
"key": "2a5e548f3e0a41534da2a77e1c048a39",
|
||||
"input": "915827e28ba42e3bcda151d7d2bf0bcb",
|
||||
"sum": "4578cbdb5feb5307"
|
||||
},
|
||||
{
|
||||
"key": "191c8f75c4a761c38e6547c4a26e0283",
|
||||
"input": "6e23af10e67324847f1302c9ac3e966fc0ba85ae4c2e7768",
|
||||
"sum": "898ce6ab7cd74be7"
|
||||
},
|
||||
{
|
||||
"key": "869ebecf71213b881b9a7eea65848599",
|
||||
"input": "cf790c47ea1cd265e2fbf329c20f28afa5b92581d685d09aeaba0fe4b47fc3",
|
||||
"sum": "0aeee596a69535d5"
|
||||
},
|
||||
{
|
||||
"key": "dfd5d0ed6be757ee3b8368c46b31f198",
|
||||
"input": "2dc7384e2f5bd820e8ce5bbac2129c2cbcb932d46c96a986566a55cd1a8c3c2b",
|
||||
"sum": "337f2b23f7628c76"
|
||||
},
|
||||
{
|
||||
"key": "d4ead1a74e6ae967c3be63d1c8cc2eff",
|
||||
"input": "37d98992d5c9ae73b581b65281af9adabe380f79d7cca70f8e71164cdf533acc3060448b3a84212f1e8de1f0bba34f2f33ec0217d25c87fd519c636b49e69a",
|
||||
"sum": "db78c2910a580241"
|
||||
},
|
||||
{
|
||||
"key": "e7bc535b23ff38074a0faa0a58741e51",
|
||||
"input": "dfa09d4e66b0dd052b0d70a755f9ecafd044f0ca9d622f7bc0fe72d3b59edec0128900d17ea87239d361769088869762cbf5fe8f38262482888af66d296fdbcc",
|
||||
"sum": "3e6bdc1e9981e8ff"
|
||||
},
|
||||
{
|
||||
"key": "60a4bdb8d6a7885b5bd8ee9e5332ebcd",
|
||||
"input": "7f293c0b08f1c59b4900f744845cc84ae1bafc2e471f13c860db5c30858e701929f3ef2a3e2739b5e6727963f0af52019bf284a3dc0bca30db57129cb9dfaab3424b7a6f19a66e9092424a9226f2a67a2db6cac4dfbccb63cb7ac36e78124da170227ccd",
|
||||
"sum": "7a75a1a48be32043"
|
||||
}
|
||||
],
|
||||
"drbg": [
|
||||
{
|
||||
"seed": "c2bb177169e97393a4f8b4ed39b36571aeb6a0e3c5685a37",
|
||||
"blocks": [
|
||||
"1858382ca8007088",
|
||||
"0f868ecd25305e95",
|
||||
"56125bcd3c463e56",
|
||||
"556a39907830ce5f",
|
||||
"4fa19e5f8bff421c",
|
||||
"5f0cc7c0996435d2",
|
||||
"1f45f4ec925c88c6",
|
||||
"6031f6348fc192eb",
|
||||
"949ea637b2a35c27",
|
||||
"fe17c2321eb1dece"
|
||||
]
|
||||
},
|
||||
{
|
||||
"seed": "5444699588214860e72376e942ae36343e15971167f532d2",
|
||||
"blocks": [
|
||||
"a30c7c3c05f4a4cd",
|
||||
"945cddd61fadc6d1",
|
||||
"b156069b234c49e4",
|
||||
"be8e0851f4a91359",
|
||||
"7338737f32666114",
|
||||
"a6e7e334376c35e3",
|
||||
"b4fec45cef2413b5",
|
||||
"3090f77fa693add0",
|
||||
"4defec8b5e3020ef",
|
||||
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|
||||
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|
||||
}
|
||||
],
|
||||
"frames": [
|
||||
{
|
||||
"key": "9f4512876252ee9edf952833c494c6f9257c29493e6f3abea129b4e807ea614d18116ff428e3767dd95bf163494d742c0531371f52beb71641bef544719679492098506c5dd01d67",
|
||||
"payloads": [
|
||||
"",
|
||||
"00",
|
||||
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|
||||
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|
||||
"02b6024e2db76d216c969087895114a367"
|
||||
],
|
||||
"frames": [
|
||||
"9ea21a090c8bf3a1bf53b91fc12d22988b22",
|
||||
"33b72a8aafa39f797bb8c9e9cc0cc456189336",
|
||||
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|
||||
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|
||||
"24756acd27971bd2daf0e8476c923db1b7918886d7f1181f7496ce052523b21c00831d"
|
||||
]
|
||||
},
|
||||
{
|
||||
"key": "67c293b980defca8f8480290a08f2905ade17c08a5f8f7ba4a5d05bc3a2ea0b798316d3c7f25703ad6d17a7391cd26964e74086194417c53d93ca8ec07e92922da38fd3d91f8ba93",
|
||||
"payloads": [
|
||||
"",
|
||||
"d7",
|
||||
"ece4fe6bdbe5e9f1b9d4af51ead088482cc9afe52e2640d24c83487466f5a973a098406bf230cdeeea9899b56904f4a1f43d8749c1a307986a02d9c10225c04c855fd3ddbcc7519f89d5221018a196a928bab51338bd48a52b10832251461405de2795aa",
|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
{
|
||||
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|
||||
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|
||||
"",
|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
]
|
||||
},
|
||||
{
|
||||
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|
||||
"payloads": [
|
||||
"",
|
||||
"73",
|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
{
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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|
||||
]
|
||||
},
|
||||
{
|
||||
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|
||||
"payloads": [
|
||||
"",
|
||||
"ff",
|
||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
]
|
||||
},
|
||||
{
|
||||
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|
||||
"payloads": [
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
]
|
||||
},
|
||||
{
|
||||
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|
||||
"payloads": [
|
||||
"",
|
||||
"c2",
|
||||
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||||
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File diff suppressed because one or more lines are too long
@@ -0,0 +1,567 @@
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||||
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||||
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}
|
||||
Executable
+91
@@ -0,0 +1,91 @@
|
||||
#!/usr/bin/env bash
|
||||
# Run the Kotlin obfs4 port against real lyrebird, in both directions.
|
||||
#
|
||||
# 🔴 The only check that proves interoperability. Everything else in `:obfs4`
|
||||
# compares against recorded vectors or against itself, and two identically-wrong
|
||||
# ends agree perfectly.
|
||||
#
|
||||
# ⚠️ A wire-format bug shows up as SILENCE, not an error: obfs4 bridges do not
|
||||
# answer handshakes they cannot verify. The Kotlin side uses read timeouts and
|
||||
# reports them as "the bridge refused to answer".
|
||||
#
|
||||
# ⚠️ The Go counterparty lives in the flamenet-elligator2 checkout, which also
|
||||
# holds the Swift port. Both clients are pinned to the SAME reference rather
|
||||
# than to each other — two independent implementations agreeing with lyrebird is
|
||||
# a real statement; agreeing with each other is not.
|
||||
set -euo pipefail
|
||||
cd "$(dirname "$0")/.."
|
||||
|
||||
REFERENCE="${FN_OBFS4_REFERENCE:-../flamenet-elligator2/Reference}"
|
||||
if [[ ! -d "$REFERENCE" ]]; then
|
||||
echo "Cannot find the Go reference at $REFERENCE."
|
||||
echo "Clone flamenet-elligator2 beside this repo, or set FN_OBFS4_REFERENCE."
|
||||
exit 1
|
||||
fi
|
||||
|
||||
WORK="$(mktemp -d)"
|
||||
PARAMS="$WORK/params.json"
|
||||
SERVER_LOG="$WORK/server.log"
|
||||
|
||||
cleanup() {
|
||||
if [[ -n "${SERVER_PID:-}" ]] && kill -0 "$SERVER_PID" 2>/dev/null; then
|
||||
kill "$SERVER_PID" 2>/dev/null || true
|
||||
wait "$SERVER_PID" 2>/dev/null || true
|
||||
fi
|
||||
# The bridge log is the other half of every diagnosis: it says whether the
|
||||
# handshake was accepted or refused, which the silent client cannot.
|
||||
if [[ -s "$SERVER_LOG" ]]; then echo "--- bridge log ---"; cat "$SERVER_LOG"; fi
|
||||
rm -rf "$WORK"
|
||||
}
|
||||
trap cleanup EXIT
|
||||
|
||||
echo "building the lyrebird bridge and client..."
|
||||
(cd "$REFERENCE" && go build -o "$WORK/interopserver" ./interopserver)
|
||||
(cd "$REFERENCE" && go build -o "$WORK/interopclient" ./interopclient)
|
||||
|
||||
"$WORK/interopserver" -params "$PARAMS" -addr 127.0.0.1:0 >/dev/null 2>"$SERVER_LOG" &
|
||||
SERVER_PID=$!
|
||||
|
||||
# ⚠️ Poll for the params file rather than sleeping. A fixed sleep is either
|
||||
# flaky or slow, and on a loaded machine it is both.
|
||||
for _ in $(seq 1 100); do
|
||||
[[ -f "$PARAMS" ]] && break
|
||||
kill -0 "$SERVER_PID" 2>/dev/null || { echo "the bridge died on startup"; exit 1; }
|
||||
sleep 0.1
|
||||
done
|
||||
[[ -f "$PARAMS" ]] || { echo "the bridge never published its parameters"; exit 1; }
|
||||
|
||||
# ⚠️ sed, not python3 or jq: the CI images for this repo cannot be assumed to
|
||||
# have either, and that assumption has cost red pipelines before.
|
||||
ADDRESS="$(sed -n 's/.*"address"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' "$PARAMS")"
|
||||
[[ -n "$ADDRESS" ]] || { echo "could not read the bridge address from $PARAMS"; exit 1; }
|
||||
echo "bridge up at $ADDRESS"
|
||||
|
||||
# 🔴 `--rerun-tasks`, because Gradle's up-to-date check does not know the
|
||||
# counterparty changed. Without it a second run skips the task entirely and
|
||||
# prints nothing — the tests do not fail, they simply never happen. Caught by
|
||||
# the name check below, which is the second time that check has earned its keep
|
||||
# in ten minutes.
|
||||
OBFS4_INTEROP_PARAMS="$PARAMS" OBFS4_INTEROP_CLIENT="$WORK/interopclient" \
|
||||
./gradlew :obfs4:test --tests '*InteropTest*' --rerun-tasks --console=plain 2>&1 \
|
||||
| tee "$WORK/test.log"
|
||||
|
||||
# 🔴 A Gradle filter that matches nothing still exits 0, which would make "no
|
||||
# interop coverage at all" look exactly like success.
|
||||
for name in "a handshake and an echo against a real lyrebird bridge" \
|
||||
"a bridge ignores a handshake it cannot verify" \
|
||||
"a real lyrebird client accepts the kotlin bridge"; do
|
||||
# ⚠️ Gradle prints `name() PASSED`, with parentheses. Matching on
|
||||
# "$name PASSED" silently matches nothing — which this check caught on
|
||||
# itself, reporting failure while all three tests had passed.
|
||||
grep -qF "$name() PASSED" "$WORK/test.log" || {
|
||||
echo
|
||||
echo "FAILED: '$name' did not pass. A filter that matches nothing exits 0,"
|
||||
echo "so each test is checked by name rather than trusting the exit code."
|
||||
exit 1
|
||||
}
|
||||
done
|
||||
|
||||
echo
|
||||
echo "ANDROID INTEROP OK: both directions -- a real lyrebird bridge accepted the"
|
||||
echo "Kotlin client, and a real lyrebird client accepted the Kotlin bridge."
|
||||
@@ -31,5 +31,11 @@ include(":client")
|
||||
// be tested without an emulator.
|
||||
include(":app")
|
||||
|
||||
// The obfs4 pluggable transport, for reaching a relay on a network that blocks
|
||||
// or fingerprints TLS to it. A plain JVM library like `:engine`, so its tests
|
||||
// run without an emulator -- which matters here because the only tests that
|
||||
// mean anything are vector comparisons against the reference implementation.
|
||||
include(":obfs4")
|
||||
|
||||
// The cross-engine interop driver. Not shipped; see `engine/test/interop-kotlin.mjs`.
|
||||
include(":interop")
|
||||
|
||||
Reference in New Issue
Block a user