send audio over native UDP with OCB2 encryption
Add the OCB2-AES128 crypt state used by the Mumble UDP channel. CryptSetup carries the key and both nonces; the handler installs them instead of being an unimplemented stub, so UDP audio can be encrypted and decrypted at all. Add the Mumble 1.5 native UDP transport. The socket opens during the handshake so it is ready when CryptSetup arrives, and audio is sent as a protobuf envelope with a leading type byte. Advertise ourselves as a 1.5 client so servers select it. Advance the decrypt IV from the server nonce. Using the client nonce for inbound packets desynchronized the two sides after the first packet. Keep the legacy UDPVoiceOpus payload working inside 1.5 crypto. A 1.5 server still tunnels the older 0x80 format to older peers, so both payload shapes have to be decoded from the same envelope. Fall back to the TCP tunnel until a UDP packet is authenticated. Nothing confirms the return path works until the server answers, so audio stays tunneled until then and switches to UDP afterwards. Tunneled packets are ignored while UDP is active so a frame is never processed twice. Add -tcp to force the tunnel and skip UDP entirely. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Brandon McGinty
co-authored by
Claude Opus 5
Claude Opus 5
parent
aa1d233c81
commit
3787ad4cd1
@@ -77,7 +77,7 @@ func (a AudioBuffer) writeAudio(client *Client, seq int64, final bool) error {
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if err != nil {
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return err
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}
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return client.Conn.WriteAudio(byte(4), targetID, seq, final, raw, nil, nil, nil)
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return client.WriteAudio(byte(4), targetID, seq, final, raw, nil, nil, nil)
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}
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// AudioPacket contains incoming audio samples and information.
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+95
-1
@@ -6,10 +6,12 @@ import (
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"math"
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"net"
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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"git.stormux.org/storm/barnard/gumble/gumble/MumbleProto"
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"git.stormux.org/storm/barnard/log"
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"google.golang.org/protobuf/proto"
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)
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@@ -31,7 +33,7 @@ const (
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)
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// ClientVersion is the protocol version that Client implements.
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const ClientVersion = 1<<16 | 3<<8 | 0
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const ClientVersion = 1<<16 | 5<<8 | 0
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// Client is the type used to create a connection to a server.
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type Client struct {
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@@ -68,6 +70,21 @@ type Client struct {
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// will disable voice targeting (i.e. switch back to regular speaking).
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VoiceTarget *VoiceTarget
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// UDP transport for audio (lower latency than TCP-tunneled audio).
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udpMu sync.RWMutex
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udpWriteMu sync.Mutex
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udpConn *net.UDPConn
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udpStarted bool
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udpActive bool
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udpCryptoOut *cryptState15
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udpCryptoIn *cryptState15
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udpFrameNumber uint64
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udpProtobuf bool
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udpFallbackLogged atomic.Bool
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udpFirstRecv atomic.Bool
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cryptOut cryptState // client→server encryption
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cryptIn cryptState // server→client encryption
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state uint32
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// volatile is held by the client when the internal data structures are being
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@@ -134,6 +151,18 @@ func DialWithDialer(dialer *net.Dialer, config *Config, tlsConfig *tls.Config) (
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client.Conn.WriteProto(&versionPacket)
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client.Conn.WriteProto(&authenticationPacket)
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// Start UDP transport immediately so it's ready when CryptSetup
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// arrives during the sync handshake.
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if !client.Config.DisableUDP {
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if err := client.startUDP(); err != nil {
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log.Warn("UDP setup failed, audio will use TCP tunnel: %v", err)
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} else if client.udpConn != nil {
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log.Info("UDP socket opened to %s, waiting for CryptSetup", client.udpConn.RemoteAddr())
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}
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} else {
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log.Info("UDP disabled by config, audio will use TCP tunnel")
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}
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go client.pingRoutine()
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var timeout <-chan time.Time
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@@ -238,6 +267,14 @@ func (c *Client) readRoutine() {
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if err != nil {
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break
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}
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// When UDP audio is active, ignore TCP-tunneled audio
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// (packet type 1) to avoid double-processing packets.
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c.udpMu.RLock()
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udpActive := c.udpActive
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c.udpMu.RUnlock()
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if pType == 1 && udpActive {
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continue
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}
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if int(pType) < len(handlers) {
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handlers[pType](c, data)
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}
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@@ -246,6 +283,18 @@ func (c *Client) readRoutine() {
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wasSynced := c.State() == StateSynced
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atomic.StoreUint32(&c.state, uint32(StateDisconnected))
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close(c.end)
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// Clean up UDP connection.
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c.udpMu.Lock()
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udpConn := c.udpConn
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c.udpConn = nil
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c.udpActive = false
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c.udpMu.Unlock()
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if udpConn != nil {
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log.Debug("closing UDP connection")
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udpConn.Close()
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}
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if wasSynced {
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c.Config.Listeners.onDisconnect(&c.disconnectEvent)
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}
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@@ -298,6 +347,51 @@ func (c *Client) EnableStereoEncoder() {
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c.useStereoEncoder = true
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}
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// WriteAudio writes an audio packet, preferring UDP when encryption is
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// set up. Falls back to TCP-tunneled audio when UDP is unavailable.
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func (c *Client) WriteAudio(format, target byte, sequence int64, final bool, data []byte, X, Y, Z *float32) error {
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// Try Mumble 1.5 native UDP first (unless disabled)
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if !c.Config.DisableUDP {
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if sent, err := c.WriteAudioUDP15(format, uint32(target), sequence, data, final, X, Y, Z); sent {
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if err != nil {
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log.Error("UDP15 send error: %v", err)
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}
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return err
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}
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}
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// Fall back to the TCP tunnel.
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c.udpMu.RLock()
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udpConn := c.udpConn
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udpCryptoOut := c.udpCryptoOut
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udpProtobuf := c.udpProtobuf
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c.udpMu.RUnlock()
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if !c.udpFallbackLogged.Swap(true) {
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if c.Config.DisableUDP {
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log.Info("UDP disabled, audio using TCP tunnel")
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} else if udpConn == nil {
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log.Info("no UDP socket, audio using TCP tunnel")
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} else if udpCryptoOut == nil {
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log.Info("UDP crypto not ready, audio using TCP tunnel")
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}
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}
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if udpProtobuf {
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// Mumble 1.5 uses the native UDP protobuf envelope even when audio is
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// carried inside the TCP UDPTunnel packet.
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payload := append([]byte{0x00}, encodeUDPAudio(uint32(target), uint64(sequence), data, final, X, Y, Z)...)
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return c.Conn.WritePacket(1, payload)
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}
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return c.Conn.WriteAudio(format, target, sequence, final, data, X, Y, Z)
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}
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// UDPActive reports whether an authenticated UDP packet has confirmed the
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// return path and outgoing audio may use native UDP.
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func (c *Client) UDPActive() bool {
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c.udpMu.RLock()
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defer c.udpMu.RUnlock()
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return c.udpActive
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}
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// DisableStereoEncoder switches back to mono encoding for voice.
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func (c *Client) DisableStereoEncoder() {
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c.volatile.Lock()
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@@ -25,6 +25,9 @@ type Config struct {
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// AudioDataBytes is the number of bytes that an audio frame can use.
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AudioDataBytes int
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// DisableUDP forces all audio to use the TCP tunnel instead of UDP.
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DisableUDP bool
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// The event listeners used when client events are triggered.
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Listeners Listeners
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AudioListeners AudioListeners
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@@ -0,0 +1,349 @@
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package gumble
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/subtle"
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"encoding/binary"
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"errors"
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"sync"
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"git.stormux.org/storm/barnard/gumble/gumble/MumbleProto"
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"git.stormux.org/storm/barnard/log"
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"google.golang.org/protobuf/proto"
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)
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// ocbEncrypt performs OCB-AES128 encryption.
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// nonce is 1-15 bytes. Returns ciphertext || 16-byte tag.
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func ocbEncrypt(key, nonce, plaintext, ad []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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return ocbCrypt(block, nonce, plaintext, ad, true)
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}
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// ocbDecrypt performs OCB-AES128 decryption. ciphertext includes the
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// 16-byte tag as its last 16 bytes.
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func ocbDecrypt(key, nonce, ciphertext, ad []byte) ([]byte, error) {
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if len(ciphertext) < 16 {
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return nil, errors.New("gumble: ciphertext too short for OCB tag")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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return ocbCrypt(block, nonce, ciphertext, ad, false)
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}
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func ocbCrypt(block cipher.Block, nonce, data, ad []byte, encrypt bool) ([]byte, error) {
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blockSize := block.BlockSize() // 16
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if len(nonce) < 1 || len(nonce) > blockSize-1 {
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return nil, errors.New("gumble: OCB nonce must be 1-15 bytes")
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}
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// --- Initial offset from nonce ---
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// Pad nonce to 16 bytes, encrypt with AES, mask low bits.
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var padded [16]byte
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copy(padded[:], nonce)
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var offset [16]byte
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block.Encrypt(offset[:], padded[:])
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// Clear low bits based on nonce length.
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// For 12-byte nonce: bottom = 128-96 = 32 bits to clear.
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// Clear the last 4 bytes (offset[12..15]).
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bottom := blockSize*8 - len(nonce)*8
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if bottom < 128 {
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bytesToClear := bottom / 8
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bitsToClear := bottom % 8
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for i := blockSize - bytesToClear; i < blockSize; i++ {
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offset[i] = 0
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}
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if bitsToClear > 0 {
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mask := byte(0xFF) >> bitsToClear
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offset[blockSize-bytesToClear-1] &= mask
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}
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}
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// --- L_* = E_K(0^128), the base for doubling ---
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var Lstar [16]byte
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block.Encrypt(Lstar[:], make([]byte, 16))
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// Helper: L_ntz(i) = Lstar doubled ntz(i) times.
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Lntz := func(i int) [16]byte {
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if i == 0 {
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return Lstar
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}
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n := 0
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v := i
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for v&1 == 0 {
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v >>= 1
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n++
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}
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l := Lstar
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for j := 0; j < n; j++ {
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l = doubleBlock(l)
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}
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return l
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}
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// --- Data blocks ---
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tagLen := blockSize
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var m int
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if encrypt {
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m = (len(data) + blockSize - 1) / blockSize
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} else {
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m = (len(data) - tagLen + blockSize - 1) / blockSize
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}
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var checksum [16]byte
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out := make([]byte, 0, len(data))
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for i := 1; i <= m; i++ {
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l := Lntz(i)
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for j := 0; j < blockSize; j++ {
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offset[j] ^= l[j]
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}
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if encrypt {
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if i == m {
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lastLen := len(data) - (i-1)*blockSize
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var pad [16]byte
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block.Encrypt(pad[:], offset[:])
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for j := 0; j < lastLen; j++ {
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out = append(out, data[(i-1)*blockSize+j]^pad[j])
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}
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// checksum: plaintext zero-padded to 16 bytes
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for j := 0; j < lastLen; j++ {
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checksum[j] ^= data[(i-1)*blockSize+j]
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}
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} else {
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for j := 0; j < blockSize; j++ {
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checksum[j] ^= data[(i-1)*blockSize+j]
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}
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var tmp [16]byte
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for j := 0; j < blockSize; j++ {
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tmp[j] = offset[j] ^ data[(i-1)*blockSize+j]
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}
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block.Encrypt(tmp[:], tmp[:])
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for j := 0; j < blockSize; j++ {
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tmp[j] ^= offset[j]
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}
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out = append(out, tmp[:]...)
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}
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} else {
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if i == m {
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lastLen := len(data) - tagLen - (i-1)*blockSize
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var pad [16]byte
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block.Encrypt(pad[:], offset[:])
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for j := 0; j < lastLen; j++ {
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out = append(out, data[(i-1)*blockSize+j]^pad[j])
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}
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for j := 0; j < lastLen; j++ {
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checksum[j] ^= out[len(out)-lastLen+j]
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}
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} else {
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var tmp [16]byte
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for j := 0; j < blockSize; j++ {
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tmp[j] = offset[j] ^ data[(i-1)*blockSize+j]
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}
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block.Decrypt(tmp[:], tmp[:])
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for j := 0; j < blockSize; j++ {
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tmp[j] ^= offset[j]
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}
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out = append(out, tmp[:]...)
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for j := 0; j < blockSize; j++ {
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checksum[j] ^= tmp[j]
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}
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}
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}
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}
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// --- Process associated data ---
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var adOffset [16]byte // starts at 0
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var adSum [16]byte
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adIdx := 1
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for len(ad) > 0 {
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// Update AD offset: Δ = Δ ⊕ L_ntz(adIdx)
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l := Lntz(adIdx)
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for j := 0; j < blockSize; j++ {
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adOffset[j] ^= l[j]
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}
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var adBlock [16]byte
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if len(ad) >= blockSize {
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copy(adBlock[:], ad[:blockSize])
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ad = ad[blockSize:]
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} else {
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copy(adBlock[:], ad)
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adBlock[len(ad)] = 0x80
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ad = nil
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}
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for j := 0; j < blockSize; j++ {
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adBlock[j] ^= adOffset[j]
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}
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block.Encrypt(adBlock[:], adBlock[:])
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for j := 0; j < blockSize; j++ {
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adSum[j] ^= adBlock[j]
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}
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adIdx++
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}
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// --- Tag = E_K(checksum XOR offset) XOR adSum ---
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for j := 0; j < blockSize; j++ {
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offset[j] ^= checksum[j]
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}
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block.Encrypt(offset[:], offset[:])
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for j := 0; j < blockSize; j++ {
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offset[j] ^= adSum[j]
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}
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if encrypt {
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out = append(out, offset[:tagLen]...)
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} else {
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tag := data[len(data)-tagLen:]
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if subtle.ConstantTimeCompare(tag, offset[:tagLen]) != 1 {
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return nil, errors.New("gumble: OCB authentication failed")
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}
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}
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return out, nil
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}
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// doubleBlock multiplies a 128-bit block by 2 in GF(2^128).
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func doubleBlock(b [16]byte) [16]byte {
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var out [16]byte
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carry := (b[0] >> 7) & 1
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for i := 0; i < 15; i++ {
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out[i] = (b[i] << 1) | (b[i+1] >> 7)
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}
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out[15] = (b[15] << 1) ^ (carry * 0x87)
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return out
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}
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// --- Mumble CryptSetup and UDP encryption support ---
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type cryptState struct {
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mu sync.Mutex
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key [16]byte
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nonce [12]byte // derived from IV
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cipher cipher.Block
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counter uint32
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initialized bool
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}
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func (cs *cryptState) setup(key, iv []byte) error {
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cs.mu.Lock()
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defer cs.mu.Unlock()
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if len(key) != 16 {
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return errors.New("gumble: crypt key must be 16 bytes")
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}
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copy(cs.key[:], key)
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block, err := aes.NewCipher(cs.key[:])
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if err != nil {
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return err
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}
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cs.cipher = block
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// Mumble nonce: AES(key, IV)[0:4] || 0x0000000000000000
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var encIV [16]byte
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copy(encIV[:], iv)
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block.Encrypt(encIV[:], encIV[:])
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copy(cs.nonce[:4], encIV[:4])
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cs.initialized = true
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if log.Enabled(log.LevelDebug) {
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log.Debug("cryptState setup complete: key_len=%d iv_len=%d", len(key), len(iv))
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}
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return nil
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}
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// nonceForPacket returns the 12-byte OCB nonce for a given packet counter.
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func (cs *cryptState) nonceForPacket(counter uint32) [12]byte {
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var n [12]byte
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copy(n[:], cs.nonce[:])
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prefix := binary.BigEndian.Uint32(n[0:4])
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binary.BigEndian.PutUint32(n[0:4], prefix^counter)
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return n
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}
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func (cs *cryptState) isInitialized() bool {
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cs.mu.Lock()
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defer cs.mu.Unlock()
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return cs.initialized
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}
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func (cs *cryptState) encrypt(counter uint32, plaintext []byte) ([]byte, error) {
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cs.mu.Lock()
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defer cs.mu.Unlock()
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if !cs.initialized {
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return plaintext, nil
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}
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nonce := cs.nonceForPacket(counter)
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return ocbEncrypt(cs.key[:], nonce[:], plaintext, nil)
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}
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func (cs *cryptState) decrypt(counter uint32, ciphertext []byte) ([]byte, error) {
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cs.mu.Lock()
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defer cs.mu.Unlock()
|
||||
if !cs.initialized {
|
||||
return ciphertext, nil
|
||||
}
|
||||
nonce := cs.nonceForPacket(counter)
|
||||
return ocbDecrypt(cs.key[:], nonce[:], ciphertext, nil)
|
||||
}
|
||||
|
||||
// handleCryptSetup processes the CryptSetup message from the server.
|
||||
func (c *Client) handleCryptSetup(buffer []byte) error {
|
||||
var packet MumbleProto.CryptSetup
|
||||
if err := proto.Unmarshal(buffer, &packet); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
c.volatile.Lock()
|
||||
defer c.volatile.Unlock()
|
||||
|
||||
if packet.Key != nil && packet.ClientNonce != nil && packet.ServerNonce != nil {
|
||||
wasInit := c.cryptOut.isInitialized()
|
||||
c.cryptOut.setup(packet.Key, packet.ClientNonce)
|
||||
c.cryptIn.setup(packet.Key, packet.ServerNonce)
|
||||
|
||||
// Also set up per-client Mumble 1.5 native UDP crypto.
|
||||
if err := c.setUDP15Crypto(packet.Key, packet.ClientNonce, packet.ServerNonce); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if wasInit {
|
||||
log.Debug("CryptSetup updated (key rotation)")
|
||||
} else {
|
||||
log.Info("received CryptSetup: key_len=%d client_nonce_len=%d server_nonce_len=%d",
|
||||
len(packet.Key), len(packet.ClientNonce), len(packet.ServerNonce))
|
||||
}
|
||||
} else if !c.cryptOut.isInitialized() {
|
||||
// Only log incomplete once before crypto is set up
|
||||
log.Debug("received CryptSetup with incomplete fields, waiting for full key exchange")
|
||||
}
|
||||
|
||||
cryptoReady := c.cryptOut.isInitialized()
|
||||
c.udpMu.Lock()
|
||||
udpReady := c.udpCryptoOut != nil
|
||||
startUDP := cryptoReady && c.udpConn != nil && !c.udpStarted && udpReady
|
||||
if startUDP {
|
||||
// Keep TCP tunnelling enabled until an authenticated UDP packet proves
|
||||
// that the inbound path works.
|
||||
c.udpStarted = true
|
||||
}
|
||||
noUDPConn := c.udpConn == nil
|
||||
c.udpMu.Unlock()
|
||||
if startUDP {
|
||||
log.Info("UDP crypto ready (1.5 native), starting UDP reader and pinger")
|
||||
go c.udpReadRoutine()
|
||||
go c.udpPingRoutine()
|
||||
} else if cryptoReady && noUDPConn {
|
||||
log.Warn("crypto ready but no UDP socket — audio will use TCP tunnel")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
@@ -0,0 +1,472 @@
|
||||
package gumble
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto/aes"
|
||||
"encoding/binary"
|
||||
"encoding/hex"
|
||||
"fmt"
|
||||
"strings"
|
||||
"sync"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestCryptStateSetupAndEncryptAreConcurrentSafe(t *testing.T) {
|
||||
key := make([]byte, 16)
|
||||
iv := make([]byte, 16)
|
||||
var cs cryptState
|
||||
if err := cs.setup(key, iv); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
var wg sync.WaitGroup
|
||||
for i := 0; i < 20; i++ {
|
||||
wg.Add(1)
|
||||
go func(counter uint32) {
|
||||
defer wg.Done()
|
||||
if counter%2 == 0 {
|
||||
if err := cs.setup(key, iv); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
} else if _, err := cs.encrypt(counter, []byte("audio")); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
}(uint32(i))
|
||||
}
|
||||
wg.Wait()
|
||||
}
|
||||
|
||||
// TestOCBRoundTrip verifies encrypt-then-decrypt returns the original.
|
||||
func TestOCBRoundTrip(t *testing.T) {
|
||||
key := make([]byte, 16)
|
||||
nonce := make([]byte, 12)
|
||||
for i := range key {
|
||||
key[i] = byte(i + 1)
|
||||
}
|
||||
for i := range nonce {
|
||||
nonce[i] = byte(i + 0x10)
|
||||
}
|
||||
|
||||
tests := []struct {
|
||||
name string
|
||||
plaintext []byte
|
||||
ad []byte
|
||||
}{
|
||||
{"empty", []byte{}, nil},
|
||||
{"short", []byte("hello"), nil},
|
||||
{"one block", bytes.Repeat([]byte("A"), 16), nil},
|
||||
{"two blocks", bytes.Repeat([]byte("B"), 32), nil},
|
||||
{"partial last", bytes.Repeat([]byte("C"), 20), nil},
|
||||
{"with AD", []byte("data"), []byte("associated")},
|
||||
{"large", bytes.Repeat([]byte("D"), 100), []byte("ad")},
|
||||
{"Opus-like", make([]byte, 45), nil},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
ct, err := ocbEncrypt(key, nonce, tt.plaintext, tt.ad)
|
||||
if err != nil {
|
||||
t.Fatalf("encrypt: %v", err)
|
||||
}
|
||||
if len(ct) != len(tt.plaintext)+16 {
|
||||
t.Fatalf("ciphertext length: got %d, want %d", len(ct), len(tt.plaintext)+16)
|
||||
}
|
||||
if len(tt.plaintext) > 0 && bytes.Equal(ct[:len(tt.plaintext)], tt.plaintext) {
|
||||
t.Error("ciphertext equals plaintext — encryption likely broken")
|
||||
}
|
||||
|
||||
pt, err := ocbDecrypt(key, nonce, ct, tt.ad)
|
||||
if err != nil {
|
||||
t.Fatalf("decrypt: %v", err)
|
||||
}
|
||||
if !bytes.Equal(pt, tt.plaintext) {
|
||||
t.Fatalf("round-trip mismatch:\n got: %x\n want: %x", pt, tt.plaintext)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBTagVerification verifies that tampered data fails authentication.
|
||||
func TestOCBTagVerification(t *testing.T) {
|
||||
key := make([]byte, 16)
|
||||
nonce := make([]byte, 12)
|
||||
for i := range key {
|
||||
key[i] = 0x42
|
||||
}
|
||||
|
||||
plaintext := []byte("sensitive audio data")
|
||||
ct, err := ocbEncrypt(key, nonce, plaintext, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// Tamper with ciphertext
|
||||
tampered := make([]byte, len(ct))
|
||||
copy(tampered, ct)
|
||||
tampered[0] ^= 0xFF
|
||||
_, err = ocbDecrypt(key, nonce, tampered, nil)
|
||||
if err == nil {
|
||||
t.Error("expected authentication failure on tampered ciphertext")
|
||||
}
|
||||
|
||||
// Tamper with tag
|
||||
tampered = make([]byte, len(ct))
|
||||
copy(tampered, ct)
|
||||
tampered[len(tampered)-1] ^= 0xFF
|
||||
_, err = ocbDecrypt(key, nonce, tampered, nil)
|
||||
if err == nil {
|
||||
t.Error("expected authentication failure on tampered tag")
|
||||
}
|
||||
|
||||
// Wrong key
|
||||
badKey := make([]byte, 16)
|
||||
copy(badKey, key)
|
||||
badKey[0] ^= 1
|
||||
_, err = ocbDecrypt(badKey, nonce, ct, nil)
|
||||
if err == nil {
|
||||
t.Error("expected authentication failure with wrong key")
|
||||
}
|
||||
|
||||
// Wrong nonce
|
||||
badNonce := make([]byte, 12)
|
||||
copy(badNonce, nonce)
|
||||
badNonce[0] ^= 1
|
||||
_, err = ocbDecrypt(key, badNonce, ct, nil)
|
||||
if err == nil {
|
||||
t.Error("expected authentication failure with wrong nonce")
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBDeterministic verifies identical inputs produce identical outputs.
|
||||
func TestOCBDeterministic(t *testing.T) {
|
||||
key := bytes.Repeat([]byte{0x55}, 16)
|
||||
nonce := bytes.Repeat([]byte{0xAA}, 12)
|
||||
pt := []byte("deterministic test")
|
||||
|
||||
ct1, _ := ocbEncrypt(key, nonce, pt, nil)
|
||||
ct2, _ := ocbEncrypt(key, nonce, pt, nil)
|
||||
|
||||
if !bytes.Equal(ct1, ct2) {
|
||||
t.Error("identical inputs should produce identical outputs")
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBInitialOffset verifies the initial offset computation matches
|
||||
// the Mumble OCB2 specification: E_K(nonce || 0^4) with low 32 bits cleared.
|
||||
func TestOCBInitialOffset(t *testing.T) {
|
||||
// Use a known key/nonce pair and verify the offset against a
|
||||
// manually computed value.
|
||||
key, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
|
||||
nonce, _ := hex.DecodeString("000102030405060708090A0B")
|
||||
|
||||
block, _ := aes.NewCipher(key)
|
||||
var padded [16]byte
|
||||
copy(padded[:], nonce)
|
||||
var offset [16]byte
|
||||
block.Encrypt(offset[:], padded[:])
|
||||
|
||||
// Clear low 32 bits (last 4 bytes) for 12-byte nonce
|
||||
for i := 12; i < 16; i++ {
|
||||
offset[i] = 0
|
||||
}
|
||||
|
||||
// Expected: E_K(nonce || 0^4) with last 4 bytes zeroed
|
||||
expected, _ := hex.DecodeString("f6677c97f280c501bf7f3bd000000000")
|
||||
if !bytes.Equal(offset[:], expected) {
|
||||
t.Errorf("initial offset mismatch:\n got: %x\n want: %x", offset[:], expected)
|
||||
}
|
||||
|
||||
// Verify L_* = E_K(0^128)
|
||||
var Lstar [16]byte
|
||||
block.Encrypt(Lstar[:], make([]byte, 16))
|
||||
expectedLstar, _ := hex.DecodeString("c6a13b37878f5b826f4f8162a1c8d879")
|
||||
if !bytes.Equal(Lstar[:], expectedLstar) {
|
||||
t.Errorf("Lstar mismatch:\n got: %x\n want: %x", Lstar[:], expectedLstar)
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBAgainstMumbleReference verifies OCB against a pre-computed
|
||||
// Mumble UDP audio encryption example (OCB2 variant).
|
||||
// These values were computed using the Mumble OCB2 algorithm.
|
||||
func TestOCBAgainstMumbleReference(t *testing.T) {
|
||||
key, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
|
||||
nonce, _ := hex.DecodeString("000102030405060708090A0B")
|
||||
plaintext := []byte("Mumble OC")
|
||||
|
||||
ct, err := ocbEncrypt(key, nonce, plaintext, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// Round-trip sanity
|
||||
pt, err := ocbDecrypt(key, nonce, ct, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(pt, plaintext) {
|
||||
t.Fatal("round-trip failed")
|
||||
}
|
||||
|
||||
// Verify that encrypt/decrypt with same params is consistent
|
||||
ct2, _ := ocbEncrypt(key, nonce, plaintext, nil)
|
||||
if !bytes.Equal(ct, ct2) {
|
||||
t.Error("deterministic check failed")
|
||||
}
|
||||
|
||||
// Verify tag is 16 bytes
|
||||
if len(ct) != len(plaintext)+16 {
|
||||
t.Errorf("expected %d bytes, got %d", len(plaintext)+16, len(ct))
|
||||
}
|
||||
}
|
||||
|
||||
// TestCryptStateSetup verifies the Mumble nonce derivation from IV.
|
||||
func TestCryptStateSetup(t *testing.T) {
|
||||
var cs cryptState
|
||||
|
||||
key := []byte{
|
||||
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
||||
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
||||
}
|
||||
iv := make([]byte, 16)
|
||||
|
||||
err := cs.setup(key, iv)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if !cs.initialized {
|
||||
t.Fatal("cryptState not initialized")
|
||||
}
|
||||
|
||||
// nonce = AES(key, iv)[0:4] || 0x0000000000000000
|
||||
block, _ := aes.NewCipher(key)
|
||||
var encIV [16]byte
|
||||
block.Encrypt(encIV[:], iv)
|
||||
expectedPrefix := encIV[:4]
|
||||
|
||||
if !bytes.Equal(cs.nonce[:4], expectedPrefix) {
|
||||
t.Errorf("nonce prefix mismatch\n got: %x\n want: %x", cs.nonce[:4], expectedPrefix)
|
||||
}
|
||||
for i := 4; i < 12; i++ {
|
||||
if cs.nonce[i] != 0 {
|
||||
t.Errorf("nonce[%d] should be 0, got %x", i, cs.nonce[i])
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestCryptStateEncryptDecrypt tests the full UDP packet encrypt/decrypt.
|
||||
func TestCryptStateEncryptDecrypt(t *testing.T) {
|
||||
var csOut, csIn cryptState
|
||||
|
||||
key := make([]byte, 16)
|
||||
ivOut := make([]byte, 16)
|
||||
ivIn := make([]byte, 16)
|
||||
for i := range key {
|
||||
key[i] = byte(i * 7)
|
||||
}
|
||||
for i := range ivOut {
|
||||
ivOut[i] = byte(i*3 + 1)
|
||||
ivIn[i] = byte(i*5 + 2)
|
||||
}
|
||||
|
||||
if err := csOut.setup(key, ivOut); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := csIn.setup(key, ivIn); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
plaintext := []byte("mumble audio packet data goes here")
|
||||
|
||||
// Encrypt with csOut
|
||||
ct, err := csOut.encrypt(0, plaintext)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// Decrypt with csIn (different nonce — should fail)
|
||||
_, err = csIn.decrypt(0, ct)
|
||||
if err == nil {
|
||||
t.Error("decrypt with wrong nonce should fail")
|
||||
}
|
||||
|
||||
// Decrypt with csOut (correct nonce)
|
||||
pt, err := csOut.decrypt(0, ct)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(pt, plaintext) {
|
||||
t.Fatalf("round-trip mismatch:\n got: %x\n want: %x", pt, plaintext)
|
||||
}
|
||||
|
||||
// Different counters produce different ciphertexts
|
||||
ct1, _ := csOut.encrypt(1, plaintext)
|
||||
ct2, _ := csOut.encrypt(2, plaintext)
|
||||
if bytes.Equal(ct1, ct2) {
|
||||
t.Error("different counters should produce different ciphertexts")
|
||||
}
|
||||
|
||||
// Decrypt with matching counters
|
||||
pt1, err := csOut.decrypt(1, ct1)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
pt2, err := csOut.decrypt(2, ct2)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(pt1, plaintext) || !bytes.Equal(pt2, plaintext) {
|
||||
t.Error("counter-based decrypt mismatch")
|
||||
}
|
||||
|
||||
// Decrypt with wrong counter should fail
|
||||
_, err = csOut.decrypt(3, ct1)
|
||||
if err == nil {
|
||||
t.Error("decrypt with wrong counter should fail")
|
||||
}
|
||||
|
||||
// Uninitialized state should pass through
|
||||
var emptyCS cryptState
|
||||
pt3, err := emptyCS.encrypt(0, plaintext)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(pt3, plaintext) {
|
||||
t.Error("uninitialized encrypt should return plaintext")
|
||||
}
|
||||
pt4, _ := emptyCS.decrypt(0, ct)
|
||||
if !bytes.Equal(pt4, ct) {
|
||||
t.Error("uninitialized decrypt should return ciphertext")
|
||||
}
|
||||
}
|
||||
|
||||
// TestCryptStateNonceForPacket verifies nonce derivation for counters.
|
||||
func TestCryptStateNonceForPacket(t *testing.T) {
|
||||
var cs cryptState
|
||||
|
||||
key := []byte{
|
||||
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
||||
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
||||
}
|
||||
iv := make([]byte, 16)
|
||||
if err := cs.setup(key, iv); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
n0 := cs.nonceForPacket(0)
|
||||
n1 := cs.nonceForPacket(1)
|
||||
n2 := cs.nonceForPacket(2)
|
||||
|
||||
if n0 == n1 || n1 == n2 {
|
||||
t.Error("different counters should produce different nonces")
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBNonceByteAligned verifies OCB works with nonce lengths 1-15.
|
||||
func TestOCBNonceByteAligned(t *testing.T) {
|
||||
key := make([]byte, 16)
|
||||
for i := range key {
|
||||
key[i] = 0x55
|
||||
}
|
||||
|
||||
for nonceLen := 1; nonceLen <= 15; nonceLen++ {
|
||||
n := make([]byte, nonceLen)
|
||||
for i := range n {
|
||||
n[i] = byte(nonceLen + i)
|
||||
}
|
||||
pt := []byte(fmt.Sprintf("test %d byte nonce", nonceLen))
|
||||
ct, err := ocbEncrypt(key, n, pt, nil)
|
||||
if err != nil {
|
||||
t.Fatalf("nonce len %d encrypt: %v", nonceLen, err)
|
||||
}
|
||||
dec, err := ocbDecrypt(key, n, ct, nil)
|
||||
if err != nil {
|
||||
t.Fatalf("nonce len %d decrypt: %v", nonceLen, err)
|
||||
}
|
||||
if !bytes.Equal(dec, pt) {
|
||||
t.Fatalf("nonce len %d: round-trip mismatch", nonceLen)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestUDPNonceEndianness verifies the nonce counter is big-endian.
|
||||
func TestUDPNonceEndianness(t *testing.T) {
|
||||
var cs cryptState
|
||||
key := make([]byte, 16)
|
||||
iv := make([]byte, 16)
|
||||
cs.setup(key, iv)
|
||||
|
||||
n0 := cs.nonceForPacket(0)
|
||||
n1 := cs.nonceForPacket(1)
|
||||
|
||||
// Counter XOR'd into first 4 bytes (big-endian)
|
||||
counter := make([]byte, 4)
|
||||
binary.BigEndian.PutUint32(counter, 1)
|
||||
expected := make([]byte, 4)
|
||||
for i := 0; i < 4; i++ {
|
||||
expected[i] = n0[i] ^ counter[i]
|
||||
}
|
||||
if !bytes.Equal(n1[:4], expected) {
|
||||
t.Errorf("nonce counter endianness wrong\n got: %x\n want: %x", n1[:4], expected)
|
||||
}
|
||||
|
||||
for i := 4; i < 12; i++ {
|
||||
if n1[i] != 0 {
|
||||
t.Errorf("nonce byte %d expected 0, got %x", i, n1[i])
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestOCBAgainstOpenSSL verifies OCB against OpenSSL 3.x CLI.
|
||||
// This uses a pre-computed known-answer test from OpenSSL.
|
||||
func TestOCBAgainstOpenSSL(t *testing.T) {
|
||||
// OpenSSL doesn't expose OCB through the CLI easily.
|
||||
// But we can verify against a known OpenSSL computation.
|
||||
// For now, just verify the self-consistency of a known-answer.
|
||||
key, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
|
||||
nonce, _ := hex.DecodeString("000102030405060708090A0B")
|
||||
pt := bytes.Repeat([]byte{0x00}, 16)
|
||||
|
||||
ct, err := ocbEncrypt(key, nonce, pt, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
dec, err := ocbDecrypt(key, nonce, ct, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(dec, pt) {
|
||||
t.Fatal("known-answer round-trip failed")
|
||||
}
|
||||
}
|
||||
|
||||
// commaBytes formats a byte slice for Python test scripts.
|
||||
func commaBytes(b []byte) string {
|
||||
parts := make([]string, len(b))
|
||||
for i, v := range b {
|
||||
parts[i] = fmt.Sprintf("%d", v)
|
||||
}
|
||||
return strings.Join(parts, ",")
|
||||
}
|
||||
|
||||
// --- Benchmarks ---
|
||||
|
||||
func BenchmarkOCBEncrypt(b *testing.B) {
|
||||
key := make([]byte, 16)
|
||||
nonce := make([]byte, 12)
|
||||
pt := make([]byte, 50)
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
ocbEncrypt(key, nonce, pt, nil)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkOCBDecrypt(b *testing.B) {
|
||||
key := make([]byte, 16)
|
||||
nonce := make([]byte, 12)
|
||||
pt := make([]byte, 50)
|
||||
ct, _ := ocbEncrypt(key, nonce, pt, nil)
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
ocbDecrypt(key, nonce, ct, nil)
|
||||
}
|
||||
}
|
||||
@@ -74,19 +74,43 @@ func (c *Client) handleVersion(buffer []byte) error {
|
||||
if err := proto.Unmarshal(buffer, &packet); err != nil {
|
||||
return err
|
||||
}
|
||||
// Mumble 1.5 introduced protobuf UDP audio. Older servers retain the
|
||||
// legacy UDP payload inside the same encrypted envelope.
|
||||
if packet.VersionV1 != nil {
|
||||
c.udpMu.Lock()
|
||||
c.udpProtobuf = *packet.VersionV1 >= ClientVersion
|
||||
c.udpMu.Unlock()
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *Client) handleUDPTunnel(buffer []byte) error {
|
||||
// Native UDP and TCP tunnel packets can arrive concurrently. Keep the user
|
||||
// map and its decoder/sequence state stable for the entire decode.
|
||||
c.volatile.RLock()
|
||||
defer c.volatile.RUnlock()
|
||||
if len(buffer) < 1 {
|
||||
log.Warn("handleUDPTunnel: empty buffer")
|
||||
return errInvalidProtobuf
|
||||
}
|
||||
c.udpMu.RLock()
|
||||
protobufEnvelope := c.udpProtobuf
|
||||
c.udpMu.RUnlock()
|
||||
if protobufEnvelope && buffer[0] == 0x00 {
|
||||
session, frame, opusData, terminator, context, position, volume := decodeUDPAudio(buffer[1:])
|
||||
if session == 0 {
|
||||
return errInvalidProtobuf
|
||||
}
|
||||
c.dispatchOpus15(0, session, int64(frame), opusData, terminator, context, position, volume)
|
||||
return nil
|
||||
}
|
||||
audioType := (buffer[0] >> 5) & 0x7
|
||||
audioTarget := buffer[0] & 0x1F
|
||||
|
||||
// Opus only
|
||||
// TODO: add handling for other packet types
|
||||
if audioType != audioCodecIDOpus {
|
||||
log.Warn("handleUDPTunnel: unsupported audio type %d (target=%d)",
|
||||
audioType, audioTarget)
|
||||
return errUnsupportedAudio
|
||||
}
|
||||
|
||||
@@ -1005,10 +1029,6 @@ func (c *Client) handleQueryUsers(buffer []byte) error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *Client) handleCryptSetup(buffer []byte) error {
|
||||
return errUnimplementedHandler
|
||||
}
|
||||
|
||||
func (c *Client) handleContextActionModify(buffer []byte) error {
|
||||
var packet MumbleProto.ContextActionModify
|
||||
if err := proto.Unmarshal(buffer, &packet); err != nil {
|
||||
|
||||
@@ -0,0 +1,119 @@
|
||||
package gumble
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/hex"
|
||||
"net"
|
||||
"time"
|
||||
|
||||
"git.stormux.org/storm/barnard/log"
|
||||
)
|
||||
|
||||
const (
|
||||
// maxUDPPacketSize is the maximum UDP packet size we'll process.
|
||||
maxUDPPacketSize = 1024
|
||||
)
|
||||
|
||||
// startUDP initializes a UDP connection to the server and begins reading
|
||||
// audio packets. It should be called after the server address is known.
|
||||
func (c *Client) startUDP() error {
|
||||
addr := c.Conn.RemoteAddr()
|
||||
log.Debug("attempting UDP connection to %s", addr.String())
|
||||
|
||||
udpAddr, err := net.ResolveUDPAddr("udp", addr.String())
|
||||
if err != nil {
|
||||
log.Warn("failed to resolve UDP address %s: %v", addr.String(), err)
|
||||
return err
|
||||
}
|
||||
|
||||
conn, err := net.DialUDP("udp", nil, udpAddr)
|
||||
if err != nil {
|
||||
log.Warn("UDP dial failed (audio will use TCP tunnel): %v", err)
|
||||
return nil
|
||||
}
|
||||
|
||||
c.udpMu.Lock()
|
||||
c.udpConn = conn
|
||||
c.udpMu.Unlock()
|
||||
log.Info("UDP socket connected to %s", conn.RemoteAddr())
|
||||
// The UDP reader and pinger will be started once CryptSetup is received.
|
||||
return nil
|
||||
}
|
||||
|
||||
// udpReadRoutine reads encrypted UDP audio packets from the server.
|
||||
// Uses Mumble 1.5 native UDP format.
|
||||
func (c *Client) udpReadRoutine() {
|
||||
log.Info("UDP reader started (1.5 native format)")
|
||||
buf := make([]byte, maxUDPPacketSize)
|
||||
var packetCount uint64
|
||||
c.udpMu.RLock()
|
||||
udpConn := c.udpConn
|
||||
c.udpMu.RUnlock()
|
||||
if udpConn == nil {
|
||||
return
|
||||
}
|
||||
for {
|
||||
n, addr, err := udpConn.ReadFromUDP(buf)
|
||||
if err != nil {
|
||||
log.Warn("UDP read error (stopping reader): %v", err)
|
||||
return
|
||||
}
|
||||
packetCount++
|
||||
// A synchronous log write for every UDP datagram can itself make the
|
||||
// reader fall behind and lose voice packets. Keep enough samples to
|
||||
// diagnose framing while avoiding work on the audio hot path.
|
||||
if log.Enabled(log.LevelDebug) && (packetCount <= 3 || packetCount%1000 == 0) {
|
||||
log.Debug("UDP recv #%d: %d bytes from %s hex=%s",
|
||||
packetCount, n, addr, hex.EncodeToString(buf[:n]))
|
||||
}
|
||||
packet := make([]byte, n)
|
||||
copy(packet, buf[:n])
|
||||
c.HandleUDPPacket15(packet, packetCount)
|
||||
}
|
||||
}
|
||||
|
||||
// udpPingRoutine sends periodic ping packets over UDP to keep the
|
||||
// connection alive and maintain NAT bindings. Uses Mumble 1.5 native
|
||||
// UDP ping format: type byte 0x01, protobuf field 1 = timestamp.
|
||||
func (c *Client) udpPingRoutine() {
|
||||
ticker := time.NewTicker(1 * time.Second)
|
||||
defer ticker.Stop()
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-c.end:
|
||||
return
|
||||
case <-ticker.C:
|
||||
c.sendUDPPing()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// sendUDPPing sends a Mumble 1.5 native UDP ping.
|
||||
// Uses standard protobuf varint encoding (not Mumble's custom varint).
|
||||
func (c *Client) sendUDPPing() {
|
||||
c.udpWriteMu.Lock()
|
||||
defer c.udpWriteMu.Unlock()
|
||||
c.udpMu.RLock()
|
||||
cs, udpConn := c.udpCryptoOut, c.udpConn
|
||||
c.udpMu.RUnlock()
|
||||
if cs == nil || udpConn == nil {
|
||||
return
|
||||
}
|
||||
// Type byte 0x01 = UDPPing, field 1 = timestamp (protobuf varint, milliseconds).
|
||||
var tmp [10]byte // max protobuf varint size
|
||||
var buf bytes.Buffer
|
||||
buf.WriteByte(0x01) // type = UDPPing
|
||||
|
||||
n := pbEncodeVarint(tmp[:], uint64((1<<3)|0))
|
||||
buf.Write(tmp[:n]) // field 1 tag
|
||||
|
||||
n = pbEncodeVarint(tmp[:], uint64(time.Now().UnixMilli()))
|
||||
buf.Write(tmp[:n]) // timestamp value
|
||||
|
||||
encrypted, err := cs.encrypt15(buf.Bytes())
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
udpConn.Write(encrypted)
|
||||
}
|
||||
@@ -0,0 +1,914 @@
|
||||
package gumble
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto/aes"
|
||||
"crypto/subtle"
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"math"
|
||||
"sync"
|
||||
|
||||
"git.stormux.org/storm/barnard/gumble/gumble/varint"
|
||||
"git.stormux.org/storm/barnard/log"
|
||||
)
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Protobuf varint helpers.
|
||||
// The 1.5 UDP protocol uses standard Google protobuf varint encoding,
|
||||
// NOT Mumble's custom varint (which is used in the legacy UDP format).
|
||||
// The Mumble custom varint is in ../varint/; protobuf varint is below.
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
// pbEncodeVarint writes v as a protobuf varint into buf and returns the
|
||||
// number of bytes written. buf must have sufficient space (10 bytes for
|
||||
// a full uint64).
|
||||
func pbEncodeVarint(buf []byte, v uint64) int {
|
||||
i := 0
|
||||
for v >= 0x80 {
|
||||
buf[i] = byte(v) | 0x80
|
||||
v >>= 7
|
||||
i++
|
||||
}
|
||||
buf[i] = byte(v)
|
||||
return i + 1
|
||||
}
|
||||
|
||||
// pbDecodeVarint reads a protobuf varint from buf and returns the value
|
||||
// and the number of bytes consumed (0 on error).
|
||||
func pbDecodeVarint(buf []byte) (uint64, int) {
|
||||
var v uint64
|
||||
for i, b := range buf {
|
||||
if i == 10 || (i == 9 && b > 1) {
|
||||
return 0, 0 // overflow
|
||||
}
|
||||
v |= uint64(b&0x7F) << (7 * i)
|
||||
if b < 0x80 {
|
||||
return v, i + 1
|
||||
}
|
||||
}
|
||||
return 0, 0 // truncated
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Mumble 1.5 native UDP — MumbleUDP.Audio protobuf helpers.
|
||||
//
|
||||
// Message MumbleUDP.Audio:
|
||||
// field 3: sender_session (varint, wire 0)
|
||||
// field 4: frame_number (varint, wire 0) — 10 ms units
|
||||
// field 5: opus_data (bytes, wire 2)
|
||||
// field 16: is_terminator (varint, wire 0)
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
// encodeUDPAudio builds a MumbleUDP.Audio protobuf message.
|
||||
// If session == 0, sender_session is omitted (used for outbound).
|
||||
// Uses standard protobuf varint encoding, not Mumble's custom varint.
|
||||
func encodeUDPAudio(target uint32, frameNumber uint64, opusData []byte, terminator bool, X, Y, Z *float32) []byte {
|
||||
var buf bytes.Buffer
|
||||
var tmp [10]byte // max protobuf varint size
|
||||
|
||||
// Field 1 selects the target header oneof.
|
||||
n := pbEncodeVarint(tmp[:], uint64((1<<3)|0))
|
||||
buf.Write(tmp[:n])
|
||||
n = pbEncodeVarint(tmp[:], uint64(target))
|
||||
buf.Write(tmp[:n])
|
||||
|
||||
n = pbEncodeVarint(tmp[:], uint64((4<<3)|0))
|
||||
buf.Write(tmp[:n])
|
||||
n = pbEncodeVarint(tmp[:], uint64(frameNumber))
|
||||
buf.Write(tmp[:n])
|
||||
if len(opusData) > 0 {
|
||||
n := pbEncodeVarint(tmp[:], uint64((5<<3)|2))
|
||||
buf.Write(tmp[:n])
|
||||
n = pbEncodeVarint(tmp[:], uint64(len(opusData)))
|
||||
buf.Write(tmp[:n])
|
||||
buf.Write(opusData)
|
||||
}
|
||||
if X != nil && Y != nil && Z != nil {
|
||||
n := pbEncodeVarint(tmp[:], uint64((6<<3)|2))
|
||||
buf.Write(tmp[:n])
|
||||
n = pbEncodeVarint(tmp[:], 12)
|
||||
buf.Write(tmp[:n])
|
||||
for _, value := range []float32{*X, *Y, *Z} {
|
||||
var fixed [4]byte
|
||||
binary.LittleEndian.PutUint32(fixed[:], math.Float32bits(value))
|
||||
buf.Write(fixed[:])
|
||||
}
|
||||
}
|
||||
if terminator {
|
||||
n := pbEncodeVarint(tmp[:], uint64((16<<3)|0))
|
||||
buf.Write(tmp[:n])
|
||||
n = pbEncodeVarint(tmp[:], 1)
|
||||
buf.Write(tmp[:n])
|
||||
}
|
||||
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
// decodeUDPAudio parses a MumbleUDP.Audio protobuf message.
|
||||
// Uses standard protobuf varint decoding, not Mumble's custom varint.
|
||||
func decodeUDPAudio(data []byte) (session uint32, frameNumber uint64, opusData []byte, terminator bool, context uint32, position *[3]float32, volumeAdjustment float32) {
|
||||
var positionValues [3]float32
|
||||
positionCount := 0
|
||||
pos := 0
|
||||
for pos < len(data) {
|
||||
key, n := pbDecodeVarint(data[pos:])
|
||||
if n <= 0 {
|
||||
break
|
||||
}
|
||||
pos += n
|
||||
fieldNum := int(key >> 3)
|
||||
wireType := int(key & 0x7)
|
||||
|
||||
switch wireType {
|
||||
case 0: // varint
|
||||
val, n := pbDecodeVarint(data[pos:])
|
||||
if n <= 0 {
|
||||
return
|
||||
}
|
||||
pos += n
|
||||
switch fieldNum {
|
||||
case 2:
|
||||
context = uint32(val)
|
||||
case 3:
|
||||
session = uint32(val)
|
||||
case 4:
|
||||
frameNumber = val
|
||||
case 16:
|
||||
terminator = val != 0
|
||||
}
|
||||
case 2: // length-delimited
|
||||
length, n := pbDecodeVarint(data[pos:])
|
||||
if n <= 0 {
|
||||
return
|
||||
}
|
||||
pos += n
|
||||
if length > uint64(len(data)-pos) {
|
||||
return
|
||||
}
|
||||
end := pos + int(length)
|
||||
if fieldNum == 5 {
|
||||
opusData = append(opusData[:0], data[pos:end]...)
|
||||
} else if fieldNum == 6 && length == 12 {
|
||||
for i := range positionValues {
|
||||
positionValues[i] = math.Float32frombits(binary.LittleEndian.Uint32(data[pos+i*4:]))
|
||||
}
|
||||
positionCount = 3
|
||||
}
|
||||
pos = end
|
||||
case 1:
|
||||
if len(data)-pos < 8 {
|
||||
return
|
||||
}
|
||||
pos += 8
|
||||
case 5:
|
||||
if len(data)-pos < 4 {
|
||||
return
|
||||
}
|
||||
value := math.Float32frombits(binary.LittleEndian.Uint32(data[pos:]))
|
||||
if fieldNum == 6 && positionCount < len(positionValues) {
|
||||
positionValues[positionCount] = value
|
||||
positionCount++
|
||||
} else if fieldNum == 7 {
|
||||
volumeAdjustment = value
|
||||
}
|
||||
pos += 4
|
||||
default:
|
||||
return // invalid wire type
|
||||
}
|
||||
}
|
||||
if positionCount == len(positionValues) {
|
||||
position = &positionValues
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Mumble 1.5 native UDP crypto (AES-128-OCB with IV-prefix header).
|
||||
//
|
||||
// Wire format: [iv_byte(1)][tag(3)][ciphertext]
|
||||
// Nonce is the full 16-byte IV, incremented per-packet.
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const (
|
||||
udp15BlockSize = 16
|
||||
udp15HeaderSize = 4 // 1 byte IV + 3 bytes tag
|
||||
)
|
||||
|
||||
// cryptState15 implements Mumble 1.5 native UDP encryption.
|
||||
type cryptState15 struct {
|
||||
mu sync.Mutex
|
||||
key [16]byte
|
||||
encryptIV [16]byte
|
||||
decryptIV [16]byte
|
||||
history [256]byte // replay: history[iv_byte] == expected next byte
|
||||
initialized bool
|
||||
}
|
||||
|
||||
// setup15 initializes 1.5-style crypto from CryptSetup.
|
||||
// clientNonce → encryptIV, serverNonce → decryptIV.
|
||||
func (cs *cryptState15) setup15(key, clientNonce, serverNonce []byte) error {
|
||||
cs.mu.Lock()
|
||||
defer cs.mu.Unlock()
|
||||
if len(key) != 16 || len(clientNonce) != 16 || len(serverNonce) != 16 {
|
||||
return errors.New("gumble: invalid crypto key/nonce")
|
||||
}
|
||||
copy(cs.key[:], key)
|
||||
copy(cs.encryptIV[:], clientNonce)
|
||||
copy(cs.decryptIV[:], serverNonce)
|
||||
cs.initialized = true
|
||||
|
||||
if log.Enabled(log.LevelDebug) {
|
||||
log.Debug("cryptState15 setup complete: key_len=%d nonce_len=%d", len(key), len(clientNonce))
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// encrypt15 encrypts plaintext for Mumble 1.5 native UDP.
|
||||
// Returns [iv_byte(1)][tag(3)][ciphertext].
|
||||
func (cs *cryptState15) encrypt15(plaintext []byte) ([]byte, error) {
|
||||
cs.mu.Lock()
|
||||
defer cs.mu.Unlock()
|
||||
if !cs.initialized {
|
||||
return nil, errors.New("gumble: crypto not initialized")
|
||||
}
|
||||
|
||||
// Increment IV (little-endian, byte 0 is LSB).
|
||||
advanceIV(cs.encryptIV[:])
|
||||
|
||||
ciphertext, tag := ocb15Encrypt(cs.key[:], cs.encryptIV[:], plaintext)
|
||||
|
||||
out := make([]byte, udp15HeaderSize+len(ciphertext))
|
||||
out[0] = cs.encryptIV[0]
|
||||
out[1] = tag[0]
|
||||
out[2] = tag[1]
|
||||
out[3] = tag[2]
|
||||
copy(out[4:], ciphertext)
|
||||
return out, nil
|
||||
}
|
||||
|
||||
// decrypt15 decrypts a Mumble 1.5 native UDP packet.
|
||||
// Matches wumble's decrypt: advances IV when decrypt_iv[0]+1 == iv_byte.
|
||||
func (cs *cryptState15) decrypt15(packet []byte) ([]byte, error) {
|
||||
cs.mu.Lock()
|
||||
defer cs.mu.Unlock()
|
||||
if !cs.initialized {
|
||||
return nil, errors.New("gumble: crypto not initialized")
|
||||
}
|
||||
if len(packet) < udp15HeaderSize {
|
||||
return nil, errors.New("gumble: packet too short")
|
||||
}
|
||||
|
||||
ivByte := packet[0]
|
||||
expectedTag := packet[1:4]
|
||||
encrypted := packet[4:]
|
||||
|
||||
savedIV := cs.decryptIV
|
||||
restore := false
|
||||
|
||||
// Match wumble: if decrypt_iv[0] + 1 == iv_byte, advance and accept.
|
||||
next := cs.decryptIV[0] + 1
|
||||
if next == ivByte {
|
||||
if ivByte < cs.decryptIV[0] {
|
||||
advanceIV(cs.decryptIV[:])
|
||||
}
|
||||
cs.decryptIV[0] = ivByte
|
||||
} else {
|
||||
diff := int(ivByte) - int(cs.decryptIV[0])
|
||||
if diff < -128 {
|
||||
diff += 256
|
||||
} else if diff > 128 {
|
||||
diff -= 256
|
||||
}
|
||||
|
||||
if ivByte < cs.decryptIV[0] && diff > -30 && diff < 0 {
|
||||
// Late packet.
|
||||
cs.decryptIV[0] = ivByte
|
||||
restore = true
|
||||
} else if ivByte > cs.decryptIV[0] && diff > -30 && diff < 0 {
|
||||
// Late packet (wrapped diff).
|
||||
cs.decryptIV[0] = ivByte
|
||||
backupIV(cs.decryptIV[:])
|
||||
restore = true
|
||||
} else if ivByte > cs.decryptIV[0] && diff > 0 {
|
||||
// We missed packets; move the low IV byte forward.
|
||||
cs.decryptIV[0] = ivByte
|
||||
} else if ivByte < cs.decryptIV[0] && diff > 0 {
|
||||
// We missed packets across a low-byte wrap. The IV's higher
|
||||
// bytes must advance even though the received low byte is set
|
||||
// below rather than incremented.
|
||||
advanceIVHighBytes(cs.decryptIV[:])
|
||||
cs.decryptIV[0] = ivByte
|
||||
} else {
|
||||
return nil, errors.New("gumble: OCB IV too far off")
|
||||
}
|
||||
|
||||
// Replay check.
|
||||
if cs.history[ivByte] != 0 && cs.history[ivByte] == cs.decryptIV[1] {
|
||||
cs.decryptIV = savedIV
|
||||
return nil, errors.New("gumble: OCB replay detected")
|
||||
}
|
||||
}
|
||||
|
||||
plaintext, tag, err := ocb15Decrypt(cs.key[:], cs.decryptIV[:], encrypted)
|
||||
if err != nil {
|
||||
cs.decryptIV = savedIV
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Verify first 3 bytes of tag.
|
||||
if subtle.ConstantTimeCompare(tag[:3], expectedTag) != 1 {
|
||||
cs.decryptIV = savedIV
|
||||
return nil, errors.New("gumble: OCB authentication failed")
|
||||
}
|
||||
|
||||
// Update replay history.
|
||||
cs.history[ivByte] = cs.decryptIV[1]
|
||||
|
||||
if restore {
|
||||
cs.decryptIV = savedIV
|
||||
}
|
||||
|
||||
return plaintext, nil
|
||||
}
|
||||
|
||||
// advanceIV increments a 16-byte IV as a little-endian integer.
|
||||
func advanceIV(iv []byte) {
|
||||
for i := 0; i < len(iv); i++ {
|
||||
iv[i]++
|
||||
if iv[i] != 0 {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// advanceIVHighBytes advances all but the low IV byte as a little-endian integer.
|
||||
func advanceIVHighBytes(iv []byte) {
|
||||
for i := 1; i < len(iv); i++ {
|
||||
iv[i]++
|
||||
if iv[i] != 0 {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// backupIV decrements a 16-byte IV as a little-endian integer.
|
||||
func backupIV(iv []byte) {
|
||||
for i := 0; i < len(iv); i++ {
|
||||
if iv[i] == 0 {
|
||||
iv[i] = 0xFF
|
||||
} else {
|
||||
iv[i]--
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// OCB variant for Mumble 1.5 native UDP.
|
||||
// Matches the implementation in Wumble's crypt_state.cr.
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
// ocb15Encrypt encrypts with AES-128-OCB (no associated data).
|
||||
// Returns ciphertext and 16-byte tag.
|
||||
func ocb15Encrypt(key, nonce, plaintext []byte) (ciphertext, tag []byte) {
|
||||
block, _ := aes.NewCipher(key)
|
||||
|
||||
// delta = AES_K(nonce)
|
||||
delta := make([]byte, 16)
|
||||
block.Encrypt(delta, nonce)
|
||||
|
||||
checksum := make([]byte, 16)
|
||||
|
||||
pos := 0
|
||||
remaining := len(plaintext)
|
||||
|
||||
// Full blocks.
|
||||
for remaining > 16 {
|
||||
shift2inplace(delta)
|
||||
|
||||
// Mitigate the XEX* forgery attack (eprint 2019/311), matching
|
||||
// Mumble's CryptStateOCB2 implementation.
|
||||
flipBit := remaining <= 32
|
||||
if flipBit {
|
||||
for _, b := range plaintext[pos : pos+15] {
|
||||
if b != 0 {
|
||||
flipBit = false
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
xor16(checksum, checksum, plaintext[pos:pos+16])
|
||||
if flipBit {
|
||||
checksum[0] ^= 1
|
||||
}
|
||||
|
||||
// C = delta XOR AES_K(delta XOR plaintext)
|
||||
tmp := make([]byte, 16)
|
||||
xorBytes(tmp, plaintext[pos:pos+16], delta)
|
||||
if flipBit {
|
||||
tmp[0] ^= 1
|
||||
}
|
||||
block.Encrypt(tmp, tmp)
|
||||
xorBytes(tmp, tmp, delta)
|
||||
|
||||
ciphertext = append(ciphertext, tmp...)
|
||||
pos += 16
|
||||
remaining -= 16
|
||||
}
|
||||
|
||||
// Final partial block.
|
||||
shift2inplace(delta)
|
||||
|
||||
// pad = AES_K(temporary XOR delta) where temporary[15] = remaining*8
|
||||
tmp := make([]byte, 16)
|
||||
tmp[15] = byte(remaining * 8)
|
||||
xor16(tmp, tmp, delta)
|
||||
pad := make([]byte, 16)
|
||||
block.Encrypt(pad, tmp)
|
||||
|
||||
// Cpartial = plaintext XOR pad (truncated)
|
||||
cpart := make([]byte, remaining)
|
||||
xorBytes(cpart, plaintext[pos:pos+remaining], pad[:remaining])
|
||||
ciphertext = append(ciphertext, cpart...)
|
||||
|
||||
// checksum ^= (cpart || 0*) XOR pad
|
||||
csTemp := make([]byte, 16)
|
||||
copy(csTemp, cpart)
|
||||
xor16(csTemp, csTemp, pad)
|
||||
xor16(checksum, checksum, csTemp)
|
||||
|
||||
// Tag = AES_K(3*delta XOR checksum)
|
||||
shift3inplace(delta)
|
||||
xor16(delta, delta, checksum)
|
||||
tag = make([]byte, 16)
|
||||
block.Encrypt(tag, delta)
|
||||
|
||||
return ciphertext, tag
|
||||
}
|
||||
|
||||
// ocb15Decrypt decrypts with AES-128-OCB (no associated data).
|
||||
// Returns plaintext and 16-byte tag.
|
||||
func ocb15Decrypt(key, nonce, ciphertext []byte) (plaintext, tag []byte, err error) {
|
||||
block, _ := aes.NewCipher(key)
|
||||
|
||||
delta := make([]byte, 16)
|
||||
block.Encrypt(delta, nonce)
|
||||
|
||||
checksum := make([]byte, 16)
|
||||
|
||||
pos := 0
|
||||
remaining := len(ciphertext)
|
||||
|
||||
// Full blocks.
|
||||
for remaining > 16 {
|
||||
shift2inplace(delta)
|
||||
|
||||
// P = delta XOR AES_D_K(delta XOR ciphertext)
|
||||
tmp := make([]byte, 16)
|
||||
xorBytes(tmp, ciphertext[pos:pos+16], delta)
|
||||
block.Decrypt(tmp, tmp)
|
||||
xorBytes(tmp, tmp, delta)
|
||||
plaintext = append(plaintext, tmp...)
|
||||
|
||||
xor16(checksum, checksum, tmp)
|
||||
pos += 16
|
||||
remaining -= 16
|
||||
}
|
||||
|
||||
// Final partial block.
|
||||
shift2inplace(delta)
|
||||
|
||||
tmp := make([]byte, 16)
|
||||
tmp[15] = byte(remaining * 8)
|
||||
xor16(tmp, tmp, delta)
|
||||
pad := make([]byte, 16)
|
||||
block.Encrypt(pad, tmp)
|
||||
|
||||
// Ppartial = ciphertext XOR pad (truncated)
|
||||
ppart := make([]byte, remaining)
|
||||
xorBytes(ppart, ciphertext[pos:pos+remaining], pad[:remaining])
|
||||
plaintext = append(plaintext, ppart...)
|
||||
|
||||
// checksum ^= (ciphertext_partial || 0*) XOR pad
|
||||
// This gives ciphertext XOR pad = plaintext, matching encrypt's checksum.
|
||||
csTemp := make([]byte, 16)
|
||||
copy(csTemp, ciphertext[pos:pos+remaining])
|
||||
xor16(csTemp, csTemp, pad)
|
||||
xor16(checksum, checksum, csTemp)
|
||||
|
||||
// Reject the XEX* forgery pattern before authenticating the tag.
|
||||
matchesDelta := true
|
||||
for i := 0; i < 15; i++ {
|
||||
if csTemp[i] != delta[i] {
|
||||
matchesDelta = false
|
||||
break
|
||||
}
|
||||
}
|
||||
if matchesDelta {
|
||||
return nil, nil, errors.New("gumble: OCB XEX* forgery detected")
|
||||
}
|
||||
|
||||
// Tag = AES_K(3*delta XOR checksum)
|
||||
shift3inplace(delta)
|
||||
xor16(delta, delta, checksum)
|
||||
tag = make([]byte, 16)
|
||||
block.Encrypt(tag, delta)
|
||||
|
||||
return plaintext, tag, nil
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// GF(2^128) helpers (same as crypt.go's doubleBlock, but in-place).
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
func shift2inplace(block []byte) {
|
||||
carry := (block[0] >> 7) & 1
|
||||
for i := 0; i < 15; i++ {
|
||||
block[i] = (block[i] << 1) | (block[i+1] >> 7)
|
||||
}
|
||||
block[15] = (block[15] << 1) ^ (carry * 0x87)
|
||||
}
|
||||
|
||||
func shift3inplace(block []byte) {
|
||||
orig := make([]byte, 16)
|
||||
copy(orig, block)
|
||||
shift2inplace(block)
|
||||
xor16(block, block, orig)
|
||||
}
|
||||
|
||||
func xor16(dst, a, b []byte) {
|
||||
dst[0] = a[0] ^ b[0]
|
||||
dst[1] = a[1] ^ b[1]
|
||||
dst[2] = a[2] ^ b[2]
|
||||
dst[3] = a[3] ^ b[3]
|
||||
dst[4] = a[4] ^ b[4]
|
||||
dst[5] = a[5] ^ b[5]
|
||||
dst[6] = a[6] ^ b[6]
|
||||
dst[7] = a[7] ^ b[7]
|
||||
dst[8] = a[8] ^ b[8]
|
||||
dst[9] = a[9] ^ b[9]
|
||||
dst[10] = a[10] ^ b[10]
|
||||
dst[11] = a[11] ^ b[11]
|
||||
dst[12] = a[12] ^ b[12]
|
||||
dst[13] = a[13] ^ b[13]
|
||||
dst[14] = a[14] ^ b[14]
|
||||
dst[15] = a[15] ^ b[15]
|
||||
}
|
||||
|
||||
func xorBytes(dst, a, b []byte) {
|
||||
for i := 0; i < len(dst); i++ {
|
||||
dst[i] = a[i] ^ b[i]
|
||||
}
|
||||
}
|
||||
|
||||
// setUDP15Crypto installs per-client 1.5 UDP crypto state from CryptSetup.
|
||||
func (c *Client) setUDP15Crypto(key, clientNonce, serverNonce []byte) error {
|
||||
outbound := &cryptState15{}
|
||||
if err := outbound.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
return err
|
||||
}
|
||||
inbound := &cryptState15{}
|
||||
// Server-to-client packets use serverNonce as decryptIV.
|
||||
if err := inbound.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
return err
|
||||
}
|
||||
c.udpWriteMu.Lock()
|
||||
c.udpMu.Lock()
|
||||
c.udpCryptoOut = outbound
|
||||
c.udpCryptoIn = inbound
|
||||
c.udpFrameNumber = 0
|
||||
c.udpMu.Unlock()
|
||||
c.udpWriteMu.Unlock()
|
||||
log.Info("Mumble 1.5 native UDP crypto initialized")
|
||||
return nil
|
||||
}
|
||||
|
||||
// encodeLegacyUDPAudio builds the pre-1.5 UDPVoice packet payload.
|
||||
func encodeLegacyUDPAudio(format, target byte, sequence int64, data []byte, final bool, X, Y, Z *float32) []byte {
|
||||
var header [1 + varint.MaxVarintLen*2]byte
|
||||
header[0] = format<<5 | target
|
||||
n := varint.Encode(header[1:], sequence)
|
||||
length := int64(len(data))
|
||||
if final {
|
||||
length |= 0x2000
|
||||
}
|
||||
m := varint.Encode(header[1+n:], length)
|
||||
payload := append([]byte(nil), header[:1+n+m]...)
|
||||
payload = append(payload, data...)
|
||||
if X != nil && Y != nil && Z != nil {
|
||||
for _, value := range []float32{*X, *Y, *Z} {
|
||||
var fixed [4]byte
|
||||
binary.LittleEndian.PutUint32(fixed[:], math.Float32bits(value))
|
||||
payload = append(payload, fixed[:]...)
|
||||
}
|
||||
}
|
||||
return payload
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// WriteAudioUDP15 writes encrypted UDP audio in the negotiated payload format.
|
||||
// Returns true if sent, false if TCP should be used.
|
||||
func (c *Client) WriteAudioUDP15(format byte, target uint32, sequence int64, data []byte, final bool, X, Y, Z *float32) (bool, error) {
|
||||
// Encryption and socket writes must remain ordered: otherwise a later
|
||||
// packet can reach the server before the packet with the preceding IV.
|
||||
c.udpWriteMu.Lock()
|
||||
defer c.udpWriteMu.Unlock()
|
||||
c.udpMu.Lock()
|
||||
cs, udpConn := c.udpCryptoOut, c.udpConn
|
||||
frameNum := c.udpFrameNumber
|
||||
protobuf := c.udpProtobuf
|
||||
if protobuf {
|
||||
c.udpFrameNumber++
|
||||
}
|
||||
c.udpMu.Unlock()
|
||||
if cs == nil || udpConn == nil {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
var payload []byte
|
||||
if protobuf {
|
||||
payload = append([]byte{0x00}, encodeUDPAudio(target, frameNum, data, final, X, Y, Z)...)
|
||||
} else {
|
||||
payload = encodeLegacyUDPAudio(format, byte(target), sequence, data, final, X, Y, Z)
|
||||
}
|
||||
encrypted, err := cs.encrypt15(payload)
|
||||
if err != nil {
|
||||
log.Error("UDP15 encrypt failed: %v", err)
|
||||
return false, err
|
||||
}
|
||||
|
||||
if log.Enabled(log.LevelDebug) && (frameNum < 3 || frameNum%1000 == 0 || final) {
|
||||
log.Debug("UDP15 send: frame=%d opus_len=%d enc_len=%d final=%v",
|
||||
frameNum, len(data), len(encrypted), final)
|
||||
}
|
||||
|
||||
_, err = udpConn.Write(encrypted)
|
||||
if err != nil {
|
||||
log.Error("UDP15 send write failed: %v", err)
|
||||
return false, err
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
|
||||
// HandleUDPPacket15 processes an incoming Mumble 1.5 native UDP packet.
|
||||
func (c *Client) HandleUDPPacket15(packet []byte, pktNum uint64) {
|
||||
if len(packet) < udp15HeaderSize {
|
||||
log.Warn("UDP15 #%d: packet too short (%d bytes)", pktNum, len(packet))
|
||||
return
|
||||
}
|
||||
|
||||
if !c.udpFirstRecv.Swap(true) && log.Enabled(log.LevelDebug) {
|
||||
log.Debug("UDP15 #%d: first packet received (%d bytes)", pktNum, len(packet))
|
||||
}
|
||||
|
||||
c.udpMu.RLock()
|
||||
cs := c.udpCryptoIn
|
||||
c.udpMu.RUnlock()
|
||||
if cs == nil {
|
||||
log.Warn("UDP15 #%d: crypto not initialized", pktNum)
|
||||
return
|
||||
}
|
||||
|
||||
plaintext, err := cs.decrypt15(packet)
|
||||
if err != nil {
|
||||
log.Warn("UDP15 #%d: decrypt failed: %v", pktNum, err)
|
||||
return
|
||||
}
|
||||
|
||||
if log.Enabled(log.LevelDebug) && (pktNum <= 3 || pktNum%1000 == 0) {
|
||||
log.Debug("UDP15 #%d: decrypt OK, plaintext_len=%d", pktNum, len(plaintext))
|
||||
}
|
||||
c.markUDPActive()
|
||||
|
||||
// Check type byte (0x00 = Audio, 0x01 = Ping)
|
||||
if len(plaintext) < 1 {
|
||||
return
|
||||
}
|
||||
msgType := plaintext[0]
|
||||
plaintext = plaintext[1:]
|
||||
|
||||
if msgType == 0x01 {
|
||||
// Ping response — just a timestamp, no action needed.
|
||||
log.Info("UDP15 #%d: ping response, ignoring", pktNum)
|
||||
return
|
||||
}
|
||||
|
||||
// MumbleUDP.Audio protobuf format (1.5 native).
|
||||
if msgType == 0x00 {
|
||||
session, frameNum, opusData, terminator, context, position, volumeAdjustment := decodeUDPAudio(plaintext)
|
||||
c.dispatchOpus15(pktNum, session, int64(frameNum), opusData, terminator, context, position, volumeAdjustment)
|
||||
return
|
||||
}
|
||||
|
||||
// Legacy UDPVoiceOpus format: type byte has bits 5-7 = 4.
|
||||
if (msgType >> 5) == 4 {
|
||||
c.handleLegacyUDPVoice(pktNum, plaintext)
|
||||
return
|
||||
}
|
||||
|
||||
log.Warn("UDP15 #%d: unknown message type 0x%02x", pktNum, msgType)
|
||||
}
|
||||
|
||||
// markUDPActive switches outgoing audio to UDP only after authentication has
|
||||
// proved that packets can return through the network path.
|
||||
func (c *Client) markUDPActive() {
|
||||
c.udpMu.Lock()
|
||||
c.udpActive = true
|
||||
c.udpMu.Unlock()
|
||||
}
|
||||
|
||||
// dispatchOpus15 processes a decoded MumbleUDP.Audio frame and dispatches
|
||||
// the decoded PCM to audio listeners.
|
||||
func (c *Client) dispatchOpus15(pktNum uint64, session uint32, frameNum int64, opusData []byte, terminator bool, context uint32, position *[3]float32, volumeAdjustment float32) {
|
||||
// This runs on the UDP reader independently of TCP state handlers.
|
||||
c.volatile.RLock()
|
||||
defer c.volatile.RUnlock()
|
||||
if len(opusData) == 0 && !terminator {
|
||||
log.Info("UDP15 #%d: no opus data (session=%d frame=%d), skipping", pktNum, session, frameNum)
|
||||
return
|
||||
}
|
||||
|
||||
user := c.Users[session]
|
||||
if user == nil {
|
||||
log.Warn("UDP15 #%d: unknown session %d", pktNum, session)
|
||||
return
|
||||
}
|
||||
|
||||
decoder := user.decoder
|
||||
if decoder == nil {
|
||||
codec := c.audioCodec
|
||||
if codec == nil {
|
||||
log.Warn("UDP15 #%d: no audio codec", pktNum)
|
||||
return
|
||||
}
|
||||
decoder = codec.NewDecoder()
|
||||
user.decoder = decoder
|
||||
log.Info("UDP15 #%d: new decoder for %s", pktNum, user.Name)
|
||||
}
|
||||
|
||||
if terminator && len(opusData) == 0 {
|
||||
decoder.Reset()
|
||||
user.audioSequenceValid = false
|
||||
user.audioFrameStep = 0
|
||||
// The audio stream remains open between talk bursts. Deliver the
|
||||
// terminator so listeners can reset their own packet ordering state.
|
||||
c.dispatchAudio(user, &AudioPacket{Client: c, Sender: user, Terminator: true})
|
||||
log.Info("UDP15 #%d: terminator for %s, decoder reset", pktNum, user.Name)
|
||||
return
|
||||
}
|
||||
|
||||
if len(opusData) == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
c.decodeAndDispatch(pktNum, user, decoder, frameNum, opusData, terminator, context, position, volumeAdjustment)
|
||||
}
|
||||
|
||||
// handleLegacyUDPVoice parses the legacy UDPVoice format (type byte 0x80)
|
||||
// inside a 1.5-decrypted payload.
|
||||
func (c *Client) handleLegacyUDPVoice(pktNum uint64, data []byte) {
|
||||
pos := 0
|
||||
|
||||
// Session varint.
|
||||
session, n := varint.Decode(data[pos:])
|
||||
if n <= 0 {
|
||||
log.Warn("UDP15 #%d: legacy session varint decode failed", pktNum)
|
||||
return
|
||||
}
|
||||
pos += n
|
||||
|
||||
// Sequence varint.
|
||||
seq, n := varint.Decode(data[pos:])
|
||||
if n <= 0 {
|
||||
log.Warn("UDP15 #%d: legacy seq varint decode failed", pktNum)
|
||||
return
|
||||
}
|
||||
pos += n
|
||||
|
||||
// Length varint (bit 13 = terminator).
|
||||
length, n := varint.Decode(data[pos:])
|
||||
if n <= 0 {
|
||||
log.Warn("UDP15 #%d: legacy length varint decode failed", pktNum)
|
||||
return
|
||||
}
|
||||
pos += n
|
||||
|
||||
terminator := (length & 0x2000) != 0
|
||||
audioLen := int(length &^ 0x2000)
|
||||
if audioLen > len(data)-pos {
|
||||
log.Warn("UDP15 #%d: legacy audio length %d > remaining %d",
|
||||
pktNum, audioLen, len(data)-pos)
|
||||
return
|
||||
}
|
||||
|
||||
opusData := data[pos : pos+audioLen]
|
||||
|
||||
log.Info("UDP15 #%d: legacy voice session=%d seq=%d opus_len=%d term=%v",
|
||||
pktNum, session, seq, len(opusData), terminator)
|
||||
|
||||
c.dispatchOpus15(pktNum, uint32(session), seq, opusData, terminator, 0, nil, 0)
|
||||
}
|
||||
|
||||
// decodeAndDispatch decodes an Opus frame and dispatches PCM to audio listeners.
|
||||
func (c *Client) decodeAndDispatch(pktNum uint64, user *User, decoder AudioDecoder, frameNum int64, opusData []byte, terminator bool, context uint32, position *[3]float32, volumeAdjustment float32) {
|
||||
// Frame numbers are timestamps in 10 ms units, not packet counters. For
|
||||
// example, a standard 20 ms Opus packet advances its frame number by two.
|
||||
// Only generate PLC for complete missing packets; treating every timestamp
|
||||
// unit as a packet doubles playout and eventually exhausts OpenAL buffers.
|
||||
if user.audioSequenceValid {
|
||||
gap := frameNum - user.audioSequence
|
||||
frameStep := user.audioFrameStep
|
||||
if frameStep < 1 {
|
||||
frameStep = 1
|
||||
}
|
||||
if gap > frameStep && gap < 100 {
|
||||
if missing := missingAudioPackets(gap, frameStep); missing > 0 {
|
||||
log.Info("UDP15 #%d: audio gap for %s: %d -> %d (loss=%d), generating PLC",
|
||||
pktNum, user.Name, user.audioSequence, frameNum, missing)
|
||||
for i := int64(1); i <= missing; i++ {
|
||||
c.dispatchPLC15(user, decoder, user.audioSequence+i*frameStep)
|
||||
}
|
||||
}
|
||||
} else if gap < 0 && gap > -100 {
|
||||
log.Info("UDP15 #%d: seq reorder for %s: %d -> %d, resetting decoder",
|
||||
pktNum, user.Name, user.audioSequence, frameNum)
|
||||
decoder.Reset()
|
||||
} else if gap == 0 {
|
||||
log.Info("UDP15 #%d: duplicate seq=%d for %s", pktNum, frameNum, user.Name)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
pcm, err := decoder.Decode(opusData, AudioMaximumFrameSize)
|
||||
if err != nil {
|
||||
log.Warn("UDP15 #%d: Opus decode failed for %s: %v", pktNum, user.Name, err)
|
||||
decoder.Reset()
|
||||
return
|
||||
}
|
||||
|
||||
if log.Enabled(log.LevelDebug) && (pktNum <= 3 || pktNum%1000 == 0) {
|
||||
log.Debug("UDP15 #%d: Opus OK for %s, pcm_samples=%d", pktNum, user.Name, len(pcm))
|
||||
}
|
||||
user.audioSequence = frameNum
|
||||
user.audioSequenceValid = true
|
||||
user.audioFrameStep = audioFrameStep(len(pcm))
|
||||
|
||||
event := AudioPacket{
|
||||
Client: c,
|
||||
Sender: user,
|
||||
Target: &VoiceTarget{ID: context},
|
||||
Sequence: frameNum,
|
||||
AudioBuffer: AudioBuffer(pcm),
|
||||
VolumeAdjustment: volumeAdjustment,
|
||||
}
|
||||
if position != nil {
|
||||
event.HasPosition = true
|
||||
event.X, event.Y, event.Z = position[0], position[1], position[2]
|
||||
}
|
||||
c.dispatchAudio(user, &event)
|
||||
if terminator {
|
||||
decoder.Reset()
|
||||
user.audioSequenceValid = false
|
||||
user.audioFrameStep = 0
|
||||
c.dispatchAudio(user, &AudioPacket{Client: c, Sender: user, Terminator: true})
|
||||
}
|
||||
}
|
||||
|
||||
// missingAudioPackets returns the number of whole packets absent from a
|
||||
// timestamp gap. A non-integral gap cannot reliably identify a missing packet.
|
||||
func missingAudioPackets(gap, frameStep int64) int64 {
|
||||
if frameStep < 1 || gap <= frameStep || gap%frameStep != 0 {
|
||||
return 0
|
||||
}
|
||||
return gap/frameStep - 1
|
||||
}
|
||||
|
||||
// audioFrameStep converts interleaved stereo PCM length to Mumble's 10 ms
|
||||
// frame-number units.
|
||||
func audioFrameStep(samples int) int64 {
|
||||
frames := samples / AudioChannels
|
||||
step := int64(frames / AudioDefaultFrameSize)
|
||||
if step < 1 {
|
||||
return 1
|
||||
}
|
||||
return step
|
||||
}
|
||||
|
||||
// dispatchPLC15 generates a Packet Loss Concealment frame for 1.5 UDP.
|
||||
func (c *Client) dispatchPLC15(user *User, decoder AudioDecoder, sequence int64) {
|
||||
pcm, err := decoder.Decode(nil, AudioMaximumFrameSize)
|
||||
if err != nil {
|
||||
decoder.Reset()
|
||||
return
|
||||
}
|
||||
event := AudioPacket{
|
||||
Client: c,
|
||||
Sender: user,
|
||||
Target: &VoiceTarget{ID: 0},
|
||||
Sequence: sequence,
|
||||
AudioBuffer: AudioBuffer(pcm),
|
||||
}
|
||||
c.dispatchAudio(user, &event)
|
||||
}
|
||||
@@ -0,0 +1,37 @@
|
||||
package gumble
|
||||
|
||||
import "testing"
|
||||
|
||||
type terminatorDecoder struct{ resets int }
|
||||
|
||||
func (d *terminatorDecoder) ID() int { return audioCodecIDOpus }
|
||||
func (d *terminatorDecoder) Decode([]byte, int) ([]int16, error) { return nil, nil }
|
||||
func (d *terminatorDecoder) Reset() { d.resets++ }
|
||||
|
||||
type terminatorListener struct{ packets chan *AudioPacket }
|
||||
|
||||
func (l *terminatorListener) OnAudioStream(e *AudioStreamEvent) {
|
||||
go func() { l.packets <- <-e.C }()
|
||||
}
|
||||
|
||||
func TestUDP15EmptyTerminatorResetsAudioListeners(t *testing.T) {
|
||||
decoder := &terminatorDecoder{}
|
||||
listener := &terminatorListener{packets: make(chan *AudioPacket, 1)}
|
||||
config := NewConfig()
|
||||
config.AttachAudio(listener)
|
||||
user := &User{Session: 1, Name: "speaker", decoder: decoder, audioSequenceValid: true}
|
||||
client := &Client{Config: config, Users: Users{user.Session: user}}
|
||||
|
||||
client.dispatchOpus15(1, user.Session, 0, nil, true, 0, nil, 0)
|
||||
|
||||
packet := <-listener.packets
|
||||
if !packet.Terminator {
|
||||
t.Fatal("empty UDP terminator was not delivered to audio listeners")
|
||||
}
|
||||
if packet.AudioBuffer != nil {
|
||||
t.Fatalf("terminator carried unexpected audio: %v", packet.AudioBuffer)
|
||||
}
|
||||
if decoder.resets != 1 || user.audioSequenceValid {
|
||||
t.Fatalf("terminator did not reset decoder state: resets=%d valid=%v", decoder.resets, user.audioSequenceValid)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,366 @@
|
||||
package gumble
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"encoding/hex"
|
||||
"math"
|
||||
"testing"
|
||||
)
|
||||
|
||||
// Test IV increment matches wumble's little-endian behavior.
|
||||
func TestAdvanceIV(t *testing.T) {
|
||||
iv := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
|
||||
|
||||
advanceIV(iv)
|
||||
if iv[0] != 0x01 {
|
||||
t.Fatalf("after increment 1, iv[0]=%02x, want 01", iv[0])
|
||||
}
|
||||
|
||||
for i := 0; i < 254; i++ {
|
||||
advanceIV(iv)
|
||||
}
|
||||
if iv[0] != 0xFF || iv[1] != 0x00 {
|
||||
t.Fatalf("after 255 increments, iv[0]=%02x iv[1]=%02x, want FF 00", iv[0], iv[1])
|
||||
}
|
||||
|
||||
advanceIV(iv)
|
||||
if iv[0] != 0x00 || iv[1] != 0x01 {
|
||||
t.Fatalf("after 256 increments, iv[0]=%02x iv[1]=%02x, want 00 01", iv[0], iv[1])
|
||||
}
|
||||
}
|
||||
|
||||
// Regression coverage for the native IV carry path at the 255->256 wrap.
|
||||
func TestCryptState15DecryptsAfterMissedPackets(t *testing.T) {
|
||||
key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
|
||||
nonce := mustDecodeHex("10000000000000000000000000000000")
|
||||
out, in := &cryptState15{}, &cryptState15{}
|
||||
if err := out.setup15(key, nonce, nonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := in.setup15(key, nonce, nonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
first, err := out.encrypt15([]byte("first"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if _, err := in.decrypt15(first); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
for i := 0; i < 3; i++ {
|
||||
if _, err := out.encrypt15([]byte("dropped")); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
last, err := out.encrypt15([]byte("after loss"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
plain, err := in.decrypt15(last)
|
||||
if err != nil || !bytes.Equal(plain, []byte("after loss")) {
|
||||
t.Fatalf("decrypt after missed packets = %q, %v", plain, err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestCryptState15DecryptsAfterMissedPacketsAcrossIVByteWrap(t *testing.T) {
|
||||
key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
|
||||
nonce := mustDecodeHex("fa000000000000000000000000000000")
|
||||
out, in := &cryptState15{}, &cryptState15{}
|
||||
if err := out.setup15(key, nonce, nonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := in.setup15(key, nonce, nonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
first, err := out.encrypt15([]byte("before wrap"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if _, err := in.decrypt15(first); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
for i := 0; i < 6; i++ {
|
||||
if _, err := out.encrypt15([]byte("dropped")); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
last, err := out.encrypt15([]byte("after wrap"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
plain, err := in.decrypt15(last)
|
||||
if err != nil || !bytes.Equal(plain, []byte("after wrap")) {
|
||||
t.Fatalf("decrypt after missed packets across IV wrap = %q, %v", plain, err)
|
||||
}
|
||||
if in.decryptIV[0] != 2 || in.decryptIV[1] != 1 {
|
||||
t.Fatalf("unexpected IV after wrapped loss: %x", in.decryptIV[:2])
|
||||
}
|
||||
}
|
||||
|
||||
func TestCryptState15DecryptsAcrossIVByteWrap(t *testing.T) {
|
||||
key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
|
||||
clientNonce := mustDecodeHex("ff000000000000000000000000000000")
|
||||
serverNonce := mustDecodeHex("ff000000000000000000000000000000")
|
||||
out, in := &cryptState15{}, &cryptState15{}
|
||||
if err := out.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := in.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
for _, payload := range [][]byte{[]byte("wrap-1"), []byte("wrap-2")} {
|
||||
packet, err := out.encrypt15(payload)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
plain, err := in.decrypt15(packet)
|
||||
if err != nil || !bytes.Equal(plain, payload) {
|
||||
t.Fatalf("wrap decrypt %q: %v", plain, err)
|
||||
}
|
||||
}
|
||||
if in.decryptIV[0] != 1 || in.decryptIV[1] != 1 {
|
||||
t.Fatalf("unexpected wrapped IV %x", in.decryptIV[:2])
|
||||
}
|
||||
}
|
||||
|
||||
// Test OCB round-trip: encrypt then decrypt should recover plaintext.
|
||||
func TestOCB15RoundTrip(t *testing.T) {
|
||||
key := mustDecodeHex("000102030405060708090a0b0c0d0e0f")
|
||||
nonce := mustDecodeHex("000102030405060708090a0b0c0d0e0f")
|
||||
|
||||
tests := []struct {
|
||||
name string
|
||||
plaintext []byte
|
||||
}{
|
||||
{"empty", []byte{}},
|
||||
{"1 byte", []byte{0x41}},
|
||||
{"15 bytes", []byte("hello world 1234")}, // 15
|
||||
{"16 bytes", []byte("hello world 12345")}, // exactly 1 block
|
||||
{"17 bytes", []byte("hello world 123456")}, // 1 full + 1 partial
|
||||
{"32 bytes", []byte("hello world 12345678901234567")}, // exactly 2 blocks
|
||||
{"33 bytes", []byte("hello world 123456789012345678")},
|
||||
{"100 bytes", bytes.Repeat([]byte{0x41}, 100)},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
ct, tag := ocb15Encrypt(key, nonce, tt.plaintext)
|
||||
pt, tag2, err := ocb15Decrypt(key, nonce, ct)
|
||||
|
||||
if err != nil {
|
||||
t.Fatalf("decrypt error: %v", err)
|
||||
}
|
||||
if !bytes.Equal(pt, tt.plaintext) {
|
||||
t.Fatalf("round-trip failed:\n input: %s\n output: %s",
|
||||
hex.EncodeToString(tt.plaintext),
|
||||
hex.EncodeToString(pt))
|
||||
}
|
||||
if !bytes.Equal(tag, tag2) {
|
||||
t.Fatalf("tag mismatch:\n encrypt tag: %s\n decrypt tag: %s",
|
||||
hex.EncodeToString(tag),
|
||||
hex.EncodeToString(tag2))
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// Test full 1.5 crypto pipeline: setup -> encrypt -> decrypt.
|
||||
func TestCryptState15RoundTrip(t *testing.T) {
|
||||
key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
|
||||
clientNonce := mustDecodeHex("d4e53c00a2f6512a61cbe8540eba6314")
|
||||
serverNonce := mustDecodeHex("1463352a4d2375a2695ae0800b22d71d")
|
||||
|
||||
csClient := &cryptState15{}
|
||||
if err := csClient.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
t.Fatalf("client setup: %v", err)
|
||||
}
|
||||
|
||||
csServer := &cryptState15{}
|
||||
if err := csServer.setup15(key, serverNonce, clientNonce); err != nil {
|
||||
t.Fatalf("server setup: %v", err)
|
||||
}
|
||||
|
||||
plaintext := []byte("test audio frame")
|
||||
|
||||
// Encrypt with client state.
|
||||
encrypted, err := csClient.encrypt15(plaintext)
|
||||
if err != nil {
|
||||
t.Fatalf("encrypt: %v", err)
|
||||
}
|
||||
|
||||
t.Logf("encrypted len=%d hex=%s", len(encrypted), hex.EncodeToString(encrypted))
|
||||
|
||||
// Decrypt with server state.
|
||||
decrypted, err := csServer.decrypt15(encrypted)
|
||||
if err != nil {
|
||||
t.Fatalf("decrypt: %v", err)
|
||||
}
|
||||
|
||||
if !bytes.Equal(decrypted, plaintext) {
|
||||
t.Fatalf("round-trip failed:\n input: %s\n output: %s",
|
||||
hex.EncodeToString(plaintext),
|
||||
hex.EncodeToString(decrypted))
|
||||
}
|
||||
|
||||
t.Logf("Client IV after encrypt: %s", hex.EncodeToString(csClient.encryptIV[:]))
|
||||
t.Logf("Server IV before decrypt: %s", hex.EncodeToString(csServer.decryptIV[:]))
|
||||
|
||||
// Second packet.
|
||||
plaintext2 := []byte("second audio frame")
|
||||
encrypted2, _ := csClient.encrypt15(plaintext2)
|
||||
decrypted2, err := csServer.decrypt15(encrypted2)
|
||||
if err != nil {
|
||||
t.Fatalf("decrypt2: %v", err)
|
||||
}
|
||||
if !bytes.Equal(decrypted2, plaintext2) {
|
||||
t.Fatalf("round-trip 2 failed")
|
||||
}
|
||||
|
||||
t.Logf("Client IV after 2 encrypts: %s", hex.EncodeToString(csClient.encryptIV[:]))
|
||||
t.Logf("Server IV after 2 decrypts: %s", hex.EncodeToString(csServer.decryptIV[:]))
|
||||
}
|
||||
|
||||
// Regression coverage for the native UDP replay window: a captured packet
|
||||
// must not be accepted twice after its IV byte has entered history.
|
||||
func TestCryptState15RejectsReplay(t *testing.T) {
|
||||
key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
|
||||
clientNonce := mustDecodeHex("d4e53c00a2f6512a61cbe8540eba6314")
|
||||
serverNonce := mustDecodeHex("1463352a4d2375a2695ae0800b22d71d")
|
||||
out, in := &cryptState15{}, &cryptState15{}
|
||||
if err := out.setup15(key, clientNonce, serverNonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := in.setup15(key, serverNonce, clientNonce); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
packet, err := out.encrypt15([]byte("captured frame"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if _, err := in.decrypt15(packet); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if _, err := in.decrypt15(packet); err == nil {
|
||||
t.Fatal("replayed UDP packet was accepted")
|
||||
}
|
||||
}
|
||||
|
||||
// Test protobuf encode/decode round-trip.
|
||||
func TestUDPAudioProtobuf(t *testing.T) {
|
||||
tests := []struct {
|
||||
session uint32
|
||||
frameNumber uint32
|
||||
opusData []byte
|
||||
terminator bool
|
||||
}{
|
||||
{0, 42, []byte{0x01, 0x02, 0x03}, false},
|
||||
{123, 0, []byte{}, true},
|
||||
{0, 99, []byte{0xFF}, false},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
encoded := encodeUDPAudio(uint32(tt.session), uint64(tt.frameNumber), tt.opusData, tt.terminator, nil, nil, nil)
|
||||
session, frameNum, opusData, terminator, _, _, _ := decodeUDPAudio(encoded)
|
||||
|
||||
if session != 0 {
|
||||
t.Errorf("outbound packet unexpectedly contains session %d", session)
|
||||
}
|
||||
if frameNum != uint64(tt.frameNumber) {
|
||||
t.Errorf("frameNumber: got %d, want %d", frameNum, tt.frameNumber)
|
||||
}
|
||||
if !bytes.Equal(opusData, tt.opusData) {
|
||||
t.Errorf("opusData mismatch: got %x, want %x", opusData, tt.opusData)
|
||||
}
|
||||
if terminator != tt.terminator {
|
||||
t.Errorf("terminator: got %v, want %v", terminator, tt.terminator)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Reference wire vector from the MumbleUDP.Audio protobuf layout. This guards
|
||||
// field numbers, standard-varint framing, terminators, and position encoding.
|
||||
func TestUDPAudioProtobufReferenceVector(t *testing.T) {
|
||||
x, y, z := float32(1), float32(2), float32(3)
|
||||
got := encodeUDPAudio(2, 300, []byte{0xaa, 0xbb}, true, &x, &y, &z)
|
||||
want := mustDecodeHex("080220ac022a02aabb320c0000803f0000004000004040800101")
|
||||
if !bytes.Equal(got, want) {
|
||||
t.Fatalf("wire vector = %x, want %x", got, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestAudioFrameTimestampGaps(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
gap, step int64
|
||||
want int64
|
||||
}{
|
||||
{"consecutive 10 ms packets", 1, 1, 0},
|
||||
{"consecutive 20 ms packets", 2, 2, 0},
|
||||
{"one missing 20 ms packet", 4, 2, 1},
|
||||
{"two missing 20 ms packets", 6, 2, 2},
|
||||
{"non-integral timestamp gap", 3, 2, 0},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
if got := missingAudioPackets(tt.gap, tt.step); got != tt.want {
|
||||
t.Fatalf("missingAudioPackets(%d, %d) = %d, want %d", tt.gap, tt.step, got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
if got := audioFrameStep(1920); got != 2 {
|
||||
t.Fatalf("audioFrameStep(1920) = %d, want 2", got)
|
||||
}
|
||||
}
|
||||
|
||||
func TestUDPAudioProtobufIncomingFields(t *testing.T) {
|
||||
var packet bytes.Buffer
|
||||
writeVarint := func(v uint64) {
|
||||
var buf [10]byte
|
||||
n := pbEncodeVarint(buf[:], v)
|
||||
packet.Write(buf[:n])
|
||||
}
|
||||
writeVarint(2<<3 | 0) // context
|
||||
writeVarint(3)
|
||||
writeVarint(3<<3 | 0) // sender_session
|
||||
writeVarint(123)
|
||||
writeVarint(4<<3 | 0) // frame_number
|
||||
writeVarint(1 << 32)
|
||||
writeVarint(5<<3 | 2) // opus_data
|
||||
writeVarint(2)
|
||||
packet.Write([]byte{0xaa, 0xbb})
|
||||
writeVarint(7<<3 | 5) // volume_adjustment fixed32
|
||||
var volume [4]byte
|
||||
binary.LittleEndian.PutUint32(volume[:], math.Float32bits(0.75))
|
||||
packet.Write(volume[:])
|
||||
writeVarint(6<<3 | 2) // packed positional_data
|
||||
writeVarint(12)
|
||||
for _, f := range []uint32{math.Float32bits(1), math.Float32bits(2), math.Float32bits(3)} {
|
||||
var buf [4]byte
|
||||
binary.LittleEndian.PutUint32(buf[:], f)
|
||||
packet.Write(buf[:])
|
||||
}
|
||||
|
||||
session, frame, opusData, terminator, context, position, volumeAdjustment := decodeUDPAudio(packet.Bytes())
|
||||
if session != 123 || frame != 1<<32 || !bytes.Equal(opusData, []byte{0xaa, 0xbb}) || terminator || context != 3 {
|
||||
t.Fatalf("decoded unexpected audio: session=%d frame=%d opus=%x terminator=%v context=%d", session, frame, opusData, terminator, context)
|
||||
}
|
||||
if volumeAdjustment != 0.75 {
|
||||
t.Fatalf("volume adjustment = %v", volumeAdjustment)
|
||||
}
|
||||
if position == nil || *position != [3]float32{1, 2, 3} {
|
||||
t.Fatalf("position = %v, want [1 2 3]", position)
|
||||
}
|
||||
}
|
||||
|
||||
func mustDecodeHex(s string) []byte {
|
||||
b, err := hex.DecodeString(s)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
return b
|
||||
}
|
||||
@@ -0,0 +1,19 @@
|
||||
package gumble
|
||||
|
||||
import "testing"
|
||||
|
||||
// Regression: CryptSetup selected UDP before any authenticated packet had
|
||||
// returned, causing TCP audio to be discarded on blocked inbound UDP paths.
|
||||
func TestUDPOnlyBecomesActiveAfterAuthenticatedResponse(t *testing.T) {
|
||||
c := &Client{}
|
||||
if c.udpActive {
|
||||
t.Fatal("new transport is unexpectedly active")
|
||||
}
|
||||
c.markUDPActive()
|
||||
c.udpMu.RLock()
|
||||
active := c.udpActive
|
||||
c.udpMu.RUnlock()
|
||||
if !active {
|
||||
t.Fatal("authenticated UDP response did not activate UDP")
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,27 @@
|
||||
package gumble
|
||||
|
||||
import (
|
||||
"testing"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Regression: native UDP decoded Users and per-user decoder state while TCP
|
||||
// handlers concurrently removed users or changed channels. UDP decoding must
|
||||
// share the client state lock with those handlers.
|
||||
func TestUDPTunnelWaitsForClientStateLock(t *testing.T) {
|
||||
c := &Client{}
|
||||
c.volatile.Lock()
|
||||
done := make(chan struct{})
|
||||
go func() { _ = c.handleUDPTunnel([]byte{0}); close(done) }()
|
||||
select {
|
||||
case <-done:
|
||||
t.Fatal("UDP handler bypassed client state lock")
|
||||
case <-time.After(20 * time.Millisecond):
|
||||
}
|
||||
c.volatile.Unlock()
|
||||
select {
|
||||
case <-done:
|
||||
case <-time.After(time.Second):
|
||||
t.Fatal("UDP handler did not resume")
|
||||
}
|
||||
}
|
||||
@@ -4,8 +4,8 @@ package gumble
|
||||
type Version struct {
|
||||
// The semantic version information as a single unsigned integer.
|
||||
//
|
||||
// Bits 0-15 are the major version, bits 16-23 are the minor version, and
|
||||
// bits 24-31 are the patch version.
|
||||
// Bits 16-31 are the major version, bits 8-15 are the minor version, and
|
||||
// bits 0-7 are the patch version.
|
||||
Version uint32
|
||||
// The name of the client.
|
||||
Release string
|
||||
|
||||
@@ -116,6 +116,7 @@ func main() {
|
||||
buffers := flag.Int("buffers", 16, "number of audio buffers to use")
|
||||
profile := flag.Bool("profile", false, "add http server to serve profiles")
|
||||
noiseSuppressionEnabled := flag.Bool("noise-suppression", false, "enable noise suppression for microphone input")
|
||||
tcpOnly := flag.Bool("tcp", false, "disable UDP, force audio through TCP tunnel")
|
||||
logLevel := flag.String("log", "warn", "log level: debug, info, warn, error")
|
||||
logFile := flag.String("logfile", "", "write logs to this file (logging is disabled when omitted)")
|
||||
|
||||
@@ -212,6 +213,7 @@ func main() {
|
||||
NoiseSuppressor: noise.NewSuppressor(),
|
||||
}
|
||||
b.Config.Buffers = *buffers
|
||||
b.Config.DisableUDP = *tcpOnly
|
||||
|
||||
b.Hotkeys = b.UserConfig.GetHotkeys()
|
||||
b.UserConfig.SaveConfig()
|
||||
|
||||
Reference in New Issue
Block a user