diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 50d70aa..32c9cb8 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -48,6 +48,22 @@ jobs: tag: ${{ github.ref }} repo_token: ${{ secrets.GITHUB_TOKEN }} + test-native: + name: Run the native hook tests + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v7 + + - name: Set up Node.js + uses: actions/setup-node@v7 + with: + node-version: '24' + cache: 'npm' + cache-dependency-path: 'test/native/package-lock.json' + + - name: Run tests + run: cd test/native && npm install && npm test + test-android: name: Test on Android emulator runs-on: ubuntu-latest diff --git a/test/native/.gitignore b/test/native/.gitignore new file mode 100644 index 0000000..c2658d7 --- /dev/null +++ b/test/native/.gitignore @@ -0,0 +1 @@ +node_modules/ diff --git a/test/native/connect-hook.test.ts b/test/native/connect-hook.test.ts new file mode 100644 index 0000000..c1a934f --- /dev/null +++ b/test/native/connect-hook.test.ts @@ -0,0 +1,237 @@ +/** + * Tests for native-connect-hook.js, run against a SOCKS server we can make misbehave. + * + * These run here rather than on a device because none of this is reachable from an app: a + * real proxy either works or it doesn't, where the interesting cases are the ones where it + * half-works. The Android suite covers that the hook intercepts real traffic; this covers + * what happens when the thing on the other end stops cooperating. + */ + +import { expect } from 'chai'; + +import { HookedProcess } from './hooked-process.ts'; +import { SocksServer, type SocksMode } from './socks-server.ts'; + +const DESTINATION = '93.184.216.34'; +const DESTINATION_PORT = 443; + +describe('The native connect hook', function () { + + this.timeout(30_000); + + let proxy: SocksServer | undefined; + let app: HookedProcess | undefined; + + afterEach(async () => { + await app?.stop(); + await proxy?.stop(); + app = proxy = undefined; + }); + + // Starts a SOCKS proxy in the given mode, with the hook pointed at it: + const givenSocksProxy = async (mode: SocksMode = 'normal') => { + proxy = await SocksServer.start(mode); + app = await HookedProcess.start({ + PROXY_HOST: `'127.0.0.1'`, + PROXY_PORT: proxy.port.toString(), + PROXY_SUPPORTS_SOCKS5: 'true' + }); + return { proxy, app }; + }; + + describe('given a working SOCKS proxy', () => { + + it('tunnels connections, and the tunnel carries data cleanly', async () => { + const { app, proxy } = await givenSocksProxy(); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(0); + expect(proxy.requests).to.deep.equal([ + { addressType: 1, address: DESTINATION, port: DESTINATION_PORT } + ]); + // The proxy echoes what it receives, so anything the handshake left unread + // would turn up in front of this: + expect(await app.echo('HELLO')).to.equal('HELLO'); + }); + + it('sends IPv4-mapped destinations as plain IPv4', async () => { + // Android apps open AF_INET6 sockets for IPv4 destinations almost universally, + // so this is the common case rather than an edge case. The 16-byte form is + // handled inconsistently by SOCKS servers - mockttp rejects it outright. + const { app, proxy } = await givenSocksProxy(); + + const result = await app.connect({ port: DESTINATION_PORT, ipv6: true }); + + expect(result.result).to.equal(0); + expect(proxy.requests).to.deep.equal([ + { addressType: 1, address: DESTINATION, port: DESTINATION_PORT } + ]); + expect(await app.echo('HELLO')).to.equal('HELLO'); + }); + + it('leaves a non-blocking socket non-blocking', async () => { + // We clear O_NONBLOCK to run the handshake. Not putting it back would leave the + // app's socket blocking for the rest of its life. + const { app } = await givenSocksProxy(); + + const result = await app.connect({ + port: DESTINATION_PORT, + nonBlocking: true + }); + + expect(result.result).to.equal(0); + expect(result.nonBlocking).to.equal(true); + }); + + it('handles a proxy that replies one byte at a time', async () => { + // recv() returns as soon as any data is available, so a reply split across + // packets is misparsed by anything that assumes otherwise - and the leftovers + // are then delivered to the application as if the server had sent them. + const { app } = await givenSocksProxy('dribble'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(0); + expect(await app.echo('HELLO')).to.equal('HELLO'); + }); + + }); + + describe('given a proxy that stops cooperating', () => { + + // The everyday version of this is the USB cable coming out. There's nothing to + // recover, so all we want is a prompt, clearly reported failure. + + it('gives up on a proxy that never replies', async () => { + const { app } = await givenSocksProxy('silent'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(result.durationMs).to.be.lessThan(20_000); + }); + + it('gives up on a proxy that stalls mid-handshake', async () => { + const { app } = await givenSocksProxy('stalls'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(result.durationMs).to.be.lessThan(20_000); + }); + + it('reports a proxy refusing the connection as a failed connect', async () => { + const { app } = await givenSocksProxy('refuses'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(app.logs.join('\n')).to.include('SOCKS: Server returned error code 5'); + }); + + it('fails cleanly when the proxy demands an auth method we do not offer', async () => { + const { app } = await givenSocksProxy('demands-auth'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(app.logs.join('\n')).to.include('SOCKS: Server rejected auth method'); + }); + + it('refuses a hostname reply rather than misreading the stream', async () => { + // ATYP 3 is legal, but nothing we proxy through replies with one. Failing beats + // guessing at how many bytes of address to consume. + const { app } = await givenSocksProxy('names-itself'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(app.logs.join('\n')).to.include('unsupported address type 3'); + }); + + it('reports a failure the application can interpret', async () => { + // -1 with errno left at 0 isn't a failure any application knows how to handle. + const { app } = await givenSocksProxy('silent'); + + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(-1); + expect(result.errno).to.equal(111); // ECONNREFUSED + }); + + it('leaves a non-blocking socket non-blocking even when the handshake fails', async () => { + const { app } = await givenSocksProxy('silent'); + + const result = await app.connect({ + port: DESTINATION_PORT, + nonBlocking: true + }); + + expect(result.result).to.equal(-1); + expect(result.nonBlocking).to.equal(true); + }); + + }); + + describe('given no SOCKS support', () => { + + it('redirects connections to the proxy', async () => { + proxy = await SocksServer.start(); + app = await HookedProcess.start({ + PROXY_HOST: `'127.0.0.1'`, + PROXY_PORT: proxy.port.toString(), + PROXY_SUPPORTS_SOCKS5: 'false' + }); + + // No SOCKS handshake, so the proxy sees a raw connection rather than a request, + // but the connection itself lands on the proxy rather than the destination: + const result = await app.connect({ port: DESTINATION_PORT }); + + expect(result.result).to.equal(0); + expect(proxy.requests).to.deep.equal([]); + }); + + it('leaves connections to the proxy itself alone', async () => { + proxy = await SocksServer.start(); + app = await HookedProcess.start({ + PROXY_HOST: `'127.0.0.1'`, + PROXY_PORT: proxy.port.toString(), + PROXY_SUPPORTS_SOCKS5: 'true' + }); + + // Already going where we'd send it, so it must be left completely untouched - + // rewriting it would send our own SOCKS handshake into the proxy twice. + const result = await app.connect({ + host: '127.0.0.1', + port: proxy.port, + nonBlocking: true + }); + + // A non-blocking connect() reports EINPROGRESS, which is exactly what proves we + // kept out of the way: had we touched it we'd have made it blocking and returned + // a result of our own. + expect(result.result).to.equal(-1); + expect(result.errno).to.equal(115); // EINPROGRESS + expect(result.nonBlocking).to.equal(true); + expect(proxy.requests).to.deep.equal([]); + }); + + it('leaves an exempted port unintercepted', async () => { + proxy = await SocksServer.start(); + app = await HookedProcess.start({ + PROXY_HOST: `'127.0.0.1'`, + PROXY_PORT: proxy.port.toString(), + IGNORED_NON_HTTP_PORTS: '[9]' + }); + + // Port 9 is exempted, so this goes to the real (dead) destination and fails, + // where without the exemption it would be redirected to our proxy and succeed: + const result = await app.connect({ host: '127.0.0.1', port: 9 }); + + expect(result.result).to.equal(-1); + }); + + }); + +}); diff --git a/test/native/hooked-process.ts b/test/native/hooked-process.ts new file mode 100644 index 0000000..91766ad --- /dev/null +++ b/test/native/hooked-process.ts @@ -0,0 +1,189 @@ +/** + * Loads the real config.js & native-connect-hook.js into a throwaway process, and makes + * socket calls inside it, so the connect hook can be tested directly on this machine. + * + * The process itself does nothing at all: Frida calls socket(), connect() and friends + * through libc for us, so there's no test-only native code to build or maintain. + */ + +import * as frida from 'frida'; +import * as fs from 'fs/promises'; +import * as path from 'path'; +import { fileURLToPath } from 'url'; + +const SCRIPTS = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../..'); + +// config.js refuses to load without one, and the connect hook never looks at it: +const PLACEHOLDER_CERT = [ + '-----BEGIN CERTIFICATE-----', + 'MIIBkTCB+w==', + '-----END CERTIFICATE-----' +].join('\n'); + +export interface ConnectResult { + /** What connect() returned to the application: 0 for success. */ + result: number; + /** The errno the application sees alongside that result. */ + errno: number; + /** How long connect() blocked for, which is what a stalled proxy costs the app. */ + durationMs: number; + /** Whether the socket is non-blocking now, i.e. whether we put it back as we found it. */ + nonBlocking: boolean; +} + +// Everything we need to do inside the target process. Written as a plain string, as it runs +// in Frida's runtime rather than Node's: +const AGENT = ` +const libc = Process.getModuleByName('libc.so.6'); +const native = (name, ret, args) => + new NativeFunction(libc.getExportByName(name), ret, args); + +const socketFn = native('socket', 'int', ['int', 'int', 'int']); +const connectFn = native('connect', 'int', ['int', 'pointer', 'int']); +const sendFn = native('send', 'ssize_t', ['int', 'pointer', 'size_t', 'int']); +const recvFn = native('recv', 'ssize_t', ['int', 'pointer', 'size_t', 'int']); +const fcntlFn = native('fcntl', 'int', ['int', 'int', 'int']); +const errnoLocation = native('__errno_location', 'pointer', []); + +const AF_INET = 2, AF_INET6 = 10, SOCK_STREAM = 1; +const F_GETFL = 3, F_SETFL = 4, O_NONBLOCK = 2048; + +let fd = -1; + +// Builds a sockaddr_in, or a sockaddr_in6 holding the IPv4-mapped form of the same address +// (::ffff:a.b.c.d) - which is what Android apps produce for almost every connection: +function buildAddress(ipv4Bytes, port, useIPv6) { + const portBytes = [(port >> 8) & 0xff, port & 0xff]; + + if (!useIPv6) { + const addr = Memory.alloc(16); + addr.writeU16(AF_INET); + addr.add(2).writeByteArray(portBytes); + addr.add(4).writeByteArray(ipv4Bytes); + return { pointer: addr, length: 16 }; + } + + const addr = Memory.alloc(28); + addr.writeU16(AF_INET6); + addr.add(2).writeByteArray(portBytes); + addr.add(8).writeByteArray( + [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff].concat(ipv4Bytes) + ); + return { pointer: addr, length: 28 }; +} + +rpc.exports = { + connect(ipv4Bytes, port, useIPv6, nonBlocking) { + fd = socketFn(useIPv6 ? AF_INET6 : AF_INET, SOCK_STREAM, 0); + if (nonBlocking) fcntlFn(fd, F_SETFL, fcntlFn(fd, F_GETFL, 0) | O_NONBLOCK); + + const address = buildAddress(ipv4Bytes, port, useIPv6); + errnoLocation().writeInt(0); + + const started = Date.now(); + const result = connectFn(fd, address.pointer, address.length); + const durationMs = Date.now() - started; + + return { + result: result, + errno: errnoLocation().readInt(), + durationMs: durationMs, + nonBlocking: (fcntlFn(fd, F_GETFL, 0) & O_NONBLOCK) !== 0 + }; + }, + + // Sends some data & reads whatever comes back, to check the tunnel begins cleanly: + echo(text) { + const buffer = Memory.alloc(256); + sendFn(fd, Memory.allocUtf8String(text), text.length, 0); + const received = recvFn(fd, buffer, 256, 0).toNumber(); + return received > 0 ? buffer.readUtf8String(received) : null; + } +}; +`; + +export class HookedProcess { + + /** Everything the scripts have logged, in order. */ + readonly logs: string[] = []; + + private pid: number; + private script: frida.Script; + + private constructor(pid: number, script: frida.Script) { + this.pid = pid; + this.script = script; + } + + static async start(settings: { [setting: string]: string } = {}) { + // Spawned through Frida rather than started ourselves and attached to: its helper + // then owns the process, where ptrace_scope=1 (the default on most CI runners) + // would otherwise refuse to let us attach to a process we merely started. + const pid = await frida.spawn([ + process.execPath, '-e', 'setInterval(() => {}, 1000)' + ]); + + try { + const session = await frida.attach(pid); + const source = await HookedProcess.buildSource(settings); + + const script = await session.createScript(source); + const hooked = new HookedProcess(pid, script); + script.logHandler = (_level, text) => { hooked.logs.push(text); }; + await script.load(); + await frida.resume(pid); + return hooked; + } catch (e) { + await frida.kill(pid).catch(() => {}); + throw e; + } + } + + private static async buildSource(settings: { [setting: string]: string }) { + let config = await fs.readFile(path.join(SCRIPTS, 'config.js'), 'utf8'); + config = config.replace(/(?<=const CERT_PEM = `)[^`]+(?=`)/s, PLACEHOLDER_CERT); + + Object.entries(settings).forEach(([setting, value]) => { + const definition = new RegExp(`(?<=const ${setting} = )[^;]+(?=;)`); + // Otherwise a renamed setting would silently not be applied, and the test would + // quietly stop testing what it says it does: + if (!definition.test(config)) { + throw new Error(`Config setting ${setting} was not found`); + } + config = config.replace(definition, value); + }); + + const hook = await fs.readFile(path.join(SCRIPTS, 'native-connect-hook.js'), 'utf8'); + + // Evaluated separately, as Frida's CLI does, so that the scripts share globals while + // each still sees itself as its own file: + return [ + `Script.evaluate('config.js', ${JSON.stringify(config)});`, + `Script.evaluate('native-connect-hook.js', ${JSON.stringify(hook)});`, + AGENT + ].join('\n'); + } + + async connect(options: { + host?: string, + port: number, + ipv6?: boolean, + nonBlocking?: boolean + }): Promise { + const host = options.host ?? '93.184.216.34'; // Somewhere the hook will redirect + return this.script.exports.connect( + host.split('.').map(Number), + options.port, + options.ipv6 ?? false, + options.nonBlocking ?? false + ) as Promise; + } + + async echo(text: string) { + return this.script.exports.echo(text) as Promise; + } + + async stop() { + await frida.kill(this.pid).catch(() => {}); + } +} diff --git a/test/native/package-lock.json b/test/native/package-lock.json new file mode 100644 index 0000000..cdaa01e --- /dev/null +++ b/test/native/package-lock.json @@ -0,0 +1,1679 @@ +{ + "name": "frida-scripts-native-tests", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "frida-scripts-native-tests", + "dependencies": { + "@types/chai": "^5.2.2", + "chai": "^5.2.0", + "frida": "^17.17.0", + "mocha": "^11.7.1" + } + }, + "node_modules/@isaacs/cliui": { + "version": "8.0.2", + "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz", + "integrity": 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tunnel starts exactly where it should: any handshake bytes left unread would + * arrive at the application as if the server had sent them. + */ + +import * as net from 'net'; + +export type SocksMode = + | 'normal' + | 'dribble' // Replies one byte at a time, forcing short reads + | 'silent' // Accepts the connection, then never replies at all + | 'stalls' // Replies to the greeting, then never replies to the request + | 'refuses' // Replies to the request with a failure code + | 'demands-auth' // Requires an auth method we don't offer + | 'names-itself'; // Replies with a hostname (ATYP 3) rather than an address + +export interface SocksRequest { + addressType: number; + address: string; + port: number; +} + +const [VERSION, NO_AUTH, NO_ACCEPTABLE_AUTH] = [0x05, 0x00, 0xFF]; +const [IPV4, HOSTNAME, IPV6] = [0x01, 0x03, 0x04]; + +export class SocksServer { + + /** Every destination a client has asked us to connect to. */ + readonly requests: SocksRequest[] = []; + + private server: net.Server; + private mode: SocksMode; + + private constructor(mode: SocksMode) { + this.mode = mode; + this.server = net.createServer((socket) => this.handle(socket)); + } + + static async start(mode: SocksMode = 'normal') { + const server = new SocksServer(mode); + await new Promise((resolve) => + server.server.listen(0, '127.0.0.1', resolve)); + return server; + } + + get port() { + return (this.server.address() as net.AddressInfo).port; + } + + async stop() { + await new Promise((resolve) => this.server.close(resolve)); + } + + private write(socket: net.Socket, data: Buffer) { + if (this.mode !== 'dribble') return socket.write(data); + + // One byte at a time, with a gap, so that a reader that assumes it gets everything + // it asked for in one go will see only part of the message: + let sent = 0; + const timer = setInterval(() => { + if (sent >= data.length || socket.destroyed) return clearInterval(timer); + socket.write(data.subarray(sent, sent + 1)); + sent += 1; + }, 5); + } + + private handle(socket: net.Socket) { + let stage: 'greeting' | 'request' | 'tunnelling' = 'greeting'; + let buffer = Buffer.alloc(0); + + socket.on('error', () => {}); // Clients hang up mid-handshake constantly here + socket.on('data', (chunk) => { + buffer = Buffer.concat([buffer, chunk]); + + if (stage === 'greeting') { + // VER, NMETHODS, then that many method bytes: + if (buffer.length < 2 || buffer.length < 2 + buffer[1]) return; + if (buffer[0] !== VERSION) return socket.destroy(); + buffer = buffer.subarray(2 + buffer[1]); + stage = 'request'; + + if (this.mode === 'silent') return; + if (this.mode === 'demands-auth') { + return this.write(socket, Buffer.from([VERSION, NO_ACCEPTABLE_AUTH])); + } + this.write(socket, Buffer.from([VERSION, NO_AUTH])); + return; + } + + if (stage === 'request') { + const request = this.parseRequest(buffer); + if (!request) return; // Not all here yet + this.requests.push(request); + buffer = Buffer.alloc(0); + stage = 'tunnelling'; + + if (this.mode === 'stalls') return; + if (this.mode === 'refuses') { + return this.write(socket, this.reply(0x05)); // Connection refused + } + this.write(socket, this.reply(0x00)); + return; + } + + socket.write(buffer); // Echo, so the tunnel's first bytes can be checked + buffer = Buffer.alloc(0); + }); + } + + private parseRequest(buffer: Buffer): SocksRequest | undefined { + if (buffer.length < 4) return; + const addressType = buffer[3]; + + const addressLength = + addressType === IPV4 ? 4 : + addressType === IPV6 ? 16 : + addressType === HOSTNAME ? (buffer.length >= 5 ? buffer[4] : undefined) : + undefined; + if (addressLength === undefined) return; + + const addressStart = addressType === HOSTNAME ? 5 : 4; + if (buffer.length < addressStart + addressLength + 2) return; + + const addressBytes = buffer.subarray(addressStart, addressStart + addressLength); + const address = + addressType === IPV4 ? [...addressBytes].join('.') : + addressType === IPV6 ? [...addressBytes].map((b) => b.toString(16).padStart(2, '0')).join('') : + addressBytes.toString(); + + return { + addressType, + address, + port: buffer.readUInt16BE(addressStart + addressLength) + }; + } + + private reply(status: number) { + if (this.mode === 'names-itself') { + const name = Buffer.from('proxy.example'); + return Buffer.concat([ + Buffer.from([VERSION, status, 0x00, HOSTNAME, name.length]), + name, + Buffer.from([0x00, 0x00]) + ]); + } + + // A blank IPv4 bound address, which is what a proxy that never makes an outgoing + // connection of its own has to report: + return Buffer.from([VERSION, status, 0x00, IPV4, 0, 0, 0, 0, 0, 0]); + } +}