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import ssh2 from 'ssh2'
import crypto from 'crypto'
import { test, describe, beforeEach, afterEach } from 'node:test'
import { strict as assert } from 'assert'
const { Server } = ssh2
import SSHConnection from '../dist/app/ssh.js'
import { TEST_USERNAME, TEST_PASSWORD, INVALID_USERNAME, INVALID_PASSWORD } from './test-constants.js'
describe('SSHConnection', () => {
let sshServer
let sshConnection
const TEST_PORT = 2222
const TEST_CREDENTIALS = {
username: TEST_USERNAME,
password: TEST_PASSWORD,
}
const { privateKey } = crypto.generateKeyPairSync('rsa', {
modulusLength: 2048,
publicKeyEncoding: {
type: 'spki',
format: 'pem',
},
privateKeyEncoding: {
type: 'pkcs1',
format: 'pem',
},
})
const mockConfig = {
ssh: {
algorithms: {},
readyTimeout: 2000,
keepaliveInterval: 1000,
keepaliveCountMax: 3,
term: 'xterm',
},
user: {
privateKey: null,
},
}
beforeEach(() => {
sshServer = new Server(
{
hostKeys: [privateKey],
},
(client) => {
client.on('authentication', (ctx) => {
if (
ctx.method === 'password' &&
ctx.username === TEST_CREDENTIALS.username &&
ctx.password === TEST_CREDENTIALS.password
) {
ctx.accept()
} else {
ctx.reject()
}
})
client.on('ready', () => {
client.on('session', (accept) => {
const session = accept()
session.once('pty', (accept) => {
accept()
})
session.once('shell', (accept) => {
const stream = accept()
stream.write('Connected to test server\r\n')
})
})
})
}
)
// Bind explicitly to loopback to avoid sandbox restrictions on 0.0.0.0
sshServer.listen(TEST_PORT, '127.0.0.1')
sshConnection = new SSHConnection(mockConfig)
})
afterEach(() => {
if (sshConnection) {
sshConnection.end()
}
return new Promise((resolve) => {
sshServer.close(resolve)
})
})
test('should connect with valid credentials', async () => {
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
const connection = await sshConnection.connect(credentials)
assert.ok(connection, 'Connection should be established')
})
test('should reject connection with invalid credentials', async () => {
const invalidCredentials = {
host: 'localhost',
port: TEST_PORT,
username: INVALID_USERNAME,
password: INVALID_PASSWORD,
}
try {
await sshConnection.connect(invalidCredentials)
assert.fail('Connection should have been rejected')
} catch (error) {
assert.equal(error.name, 'SSHConnectionError')
assert.equal(error.message, 'All authentication methods failed')
}
})
test('should connect using private key authentication', async () => {
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
privateKey: privateKey,
}
// Update server auth handler to accept private key
sshServer.removeAllListeners('connection')
sshServer.on('connection', (client) => {
client.on('authentication', (ctx) => {
if (ctx.method === 'publickey' && ctx.username === TEST_CREDENTIALS.username) {
ctx.accept()
} else {
ctx.reject()
}
})
client.on('ready', () => {
client.on('session', (accept) => {
accept()
})
})
})
const connection = await sshConnection.connect(credentials)
assert.ok(connection, 'Connection should be established using private key')
})
test('should reject invalid private key format', async () => {
const invalidPrivateKey = 'not-a-valid-private-key-format'
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
privateKey: invalidPrivateKey,
}
try {
await sshConnection.connect(credentials)
assert.fail('Connection should have been rejected')
} catch (error) {
assert.equal(error.name, 'SSHConnectionError')
assert.equal(error.message, 'Invalid private key format')
}
})
test('should resize terminal when stream exists', async () => {
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
// Connect and create shell
await sshConnection.connect(credentials)
await sshConnection.shell({ term: 'xterm' })
// Mock the setWindow method on stream
let windowResized = false
sshConnection.stream.setWindow = (rows, cols) => {
windowResized = true
assert.equal(rows, 24)
assert.equal(cols, 80)
}
// Test resize
sshConnection.resizeTerminal(24, 80)
assert.ok(windowResized, 'Terminal should be resized')
})
test('should try private key first when both password and key are provided', async () => {
const authAttemptOrder = []
sshServer.removeAllListeners('connection')
sshServer.on('connection', (client) => {
client.on('authentication', (ctx) => {
authAttemptOrder.push(ctx.method)
if (ctx.method === 'publickey' && ctx.username === TEST_CREDENTIALS.username) {
return ctx.accept()
}
if (
ctx.method === 'password' &&
ctx.username === TEST_CREDENTIALS.username &&
ctx.password === TEST_CREDENTIALS.password
) {
return ctx.accept()
}
ctx.reject(['publickey', 'password'])
})
client.on('ready', () => {
client.on('session', (accept) => {
const session = accept()
session.once('pty', (accept) => accept())
session.once('shell', (accept) => accept())
})
})
})
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
privateKey: privateKey,
password: TEST_CREDENTIALS.password,
}
const connection = await sshConnection.connect(credentials)
assert.ok(connection, 'Connection should be established')
assert.ok(
authAttemptOrder.includes('publickey'),
'Private key authentication should be attempted'
)
})
test('should handle connection failures', async () => {
const credentials = {
host: 'localhost',
port: 9999,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
try {
await sshConnection.connect(credentials)
assert.fail('Connection should have failed')
} catch (error) {
assert.equal(error.name, 'SSHConnectionError')
assert.match(error.message, /Connection failed|All authentication methods failed/)
}
})
test('should handle connection timeout', async () => {
const credentials = {
host: '240.0.0.0',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
try {
await sshConnection.connect(credentials)
assert.fail('Connection should have timed out')
} catch (error) {
assert.equal(error.name, 'SSHConnectionError')
assert.equal(error.message, 'All authentication methods failed')
}
})
test('should exec command and receive stdout and exit code', async () => {
// Reconfigure server to support exec
sshServer.removeAllListeners('connection')
sshServer.on('connection', (client) => {
client.on('authentication', (ctx) => {
if (
ctx.method === 'password' &&
ctx.username === TEST_CREDENTIALS.username &&
ctx.password === TEST_CREDENTIALS.password
) {
ctx.accept()
} else {
ctx.reject()
}
})
client.on('ready', () => {
client.on('session', (accept) => {
const session = accept()
// Accept PTY if requested prior to exec (optional)
session.on('pty', (accept) => accept && accept())
session.on('exec', (accept, _reject, info) => {
const stream = accept()
// Simulate command behavior
const out = `ran: ${info.command}\n`
stream.write(out)
// exit code 0
stream.exit(0)
stream.close()
})
})
})
})
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
await sshConnection.connect(credentials)
const stream = await sshConnection.exec('echo hello')
let stdout = ''
let code = null
await new Promise((resolve, reject) => {
stream.on('data', (data) => {
stdout += data.toString('utf-8')
})
stream.on('close', (c) => {
code = c
resolve()
})
stream.on('error', reject)
})
assert.match(stdout, /ran: echo hello/)
assert.equal(code, 0)
})
test('should exec with PTY when requested', async () => {
// Reconfigure server to capture PTY request, then exec
sshServer.removeAllListeners('connection')
let ptyRequested = false
sshServer.on('connection', (client) => {
client.on('authentication', (ctx) => {
if (
ctx.method === 'password' &&
ctx.username === TEST_CREDENTIALS.username &&
ctx.password === TEST_CREDENTIALS.password
) {
ctx.accept()
} else {
ctx.reject()
}
})
client.on('ready', () => {
client.on('session', (accept) => {
const session = accept()
session.on('pty', (accept) => {
ptyRequested = true
accept && accept()
})
session.on('exec', (accept, _reject) => {
const stream = accept()
stream.write('pty-exec\n')
stream.exit(0)
stream.close()
})
})
})
})
const credentials = {
host: 'localhost',
port: TEST_PORT,
username: TEST_CREDENTIALS.username,
password: TEST_CREDENTIALS.password,
}
await sshConnection.connect(credentials)
const stream = await sshConnection.exec('uptime', {
pty: true,
term: 'xterm',
cols: 80,
rows: 24,
})
let stdout = ''
await new Promise((resolve, reject) => {
stream.on('data', (data) => (stdout += data.toString('utf-8')))
stream.on('close', () => resolve())
stream.on('error', reject)
})
assert.equal(ptyRequested, true, 'PTY should be requested for exec')
assert.match(stdout, /pty-exec/)
})
})