func (c *client) dialServer(server string, useRandomIdentity bool) (*transport.Conn, error) {
identity := &c.identity
identityPublic := &c.identityPublic
if useRandomIdentity {
var randomIdentity [32]byte
c.randBytes(randomIdentity[:])
var randomIdentityPublic [32]byte
curve25519.ScalarBaseMult(&randomIdentityPublic, &randomIdentity)
identity = &randomIdentity
identityPublic = &randomIdentityPublic
}
serverIdentity, host, err := parseServer(server, c.testing)
if err != nil {
return nil, err
}
var tor proxy.Dialer
if c.testing {
tor = proxy.Direct
} else {
tor = c.torDialer()
}
rawConn, err := tor.Dial("tcp", host)
if err != nil {
return nil, err
}
conn := transport.NewClient(rawConn, identity, identityPublic, serverIdentity)
if err := conn.Handshake(); err != nil {
return nil, err
}
return conn, nil
}
func (c *client) dialServer(server string, useRandomIdentity bool) (*transport.Conn, error) {
identity := &c.identity
identityPublic := &c.identityPublic
if useRandomIdentity {
var randomIdentity [32]byte
c.randBytes(randomIdentity[:])
var randomIdentityPublic [32]byte
curve25519.ScalarBaseMult(&randomIdentityPublic, &randomIdentity)
identity = &randomIdentity
identityPublic = &randomIdentityPublic
}
serverIdentity, host, err := parseServer(server, c.dev)
if err != nil {
return nil, err
}
var tor proxy.Dialer
if c.dev {
tor = proxy.Direct
} else {
tor = c.torDialer()
}
rawConn, err := tor.Dial("tcp", host)
if err != nil {
return nil, err
}
// Sometimes Tor holds the connection open but we never receive
// anything so we add a 60 second deadline.
rawConn.SetDeadline(time.Now().Add(60 * time.Second))
conn := transport.NewClient(rawConn, identity, identityPublic, serverIdentity)
if err := conn.Handshake(); err != nil {
return nil, err
}
return conn, nil
}
func main() {
flag.Parse()
oldState, err := terminal.MakeRaw(0)
if err != nil {
panic(err.Error())
}
defer terminal.Restore(0, oldState)
term := terminal.NewTerminal(os.Stdin, "> ")
updateTerminalSize(term)
resizeChan := make(chan os.Signal)
go func() {
for _ = range resizeChan {
updateTerminalSize(term)
}
}()
signal.Notify(resizeChan, syscall.SIGWINCH)
if len(*configFile) == 0 {
homeDir := os.Getenv("HOME")
if len(homeDir) == 0 {
alert(term, "$HOME not set. Please either export $HOME or use the -config-file option.\n")
return
}
persistentDir := filepath.Join(homeDir, "Persistent")
if stat, err := os.Lstat(persistentDir); err == nil && stat.IsDir() {
// Looks like Tails.
homeDir = persistentDir
}
*configFile = filepath.Join(homeDir, ".xmpp-client")
}
config, err := ParseConfig(*configFile)
if err != nil {
alert(term, "Failed to parse config file: "+err.Error())
config = new(Config)
if !enroll(config, term) {
return
}
config.filename = *configFile
config.Save()
}
password := config.Password
if len(password) == 0 {
if password, err = term.ReadPassword(fmt.Sprintf("Password for %s (will not be saved to disk): ", config.Account)); err != nil {
alert(term, "Failed to read password: "******"@", 2)
if len(parts) != 2 {
alert(term, "invalid username (want user@domain): "+config.Account)
return
}
user := parts[0]
domain := parts[1]
var addr string
addrTrusted := false
if len(config.Server) > 0 && config.Port > 0 {
addr = fmt.Sprintf("%s:%d", config.Server, config.Port)
addrTrusted = true
} else {
if len(config.Proxies) > 0 {
alert(term, "Cannot connect via a proxy without Server and Port being set in the config file as an SRV lookup would leak information.")
return
}
host, port, err := xmpp.Resolve(domain)
if err != nil {
alert(term, "Failed to resolve XMPP server: "+err.Error())
return
}
addr = fmt.Sprintf("%s:%d", host, port)
}
var dialer proxy.Dialer
for i := len(config.Proxies) - 1; i >= 0; i-- {
u, err := url.Parse(config.Proxies[i])
if err != nil {
alert(term, "Failed to parse "+config.Proxies[i]+" as a URL: "+err.Error())
return
}
if dialer == nil {
dialer = proxy.Direct
}
if dialer, err = proxy.FromURL(u, dialer); err != nil {
alert(term, "Failed to parse "+config.Proxies[i]+" as a proxy: "+err.Error())
return
}
}
var certSHA256 []byte
if len(config.ServerCertificateSHA256) > 0 {
certSHA256, err = hex.DecodeString(config.ServerCertificateSHA256)
if err != nil {
alert(term, "Failed to parse ServerCertificateSHA256 (should be hex string): "+err.Error())
return
}
if len(certSHA256) != 32 {
alert(term, "ServerCertificateSHA256 is not 32 bytes long")
return
}
}
xmppConfig := &xmpp.Config{
Log: &lineLogger{term, nil},
Create: *createAccount,
TrustedAddress: addrTrusted,
Archive: false,
ServerCertificateSHA256: certSHA256,
}
if len(config.RawLogFile) > 0 {
rawLog, err := os.OpenFile(config.RawLogFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
if err != nil {
alert(term, "Failed to open raw log file: "+err.Error())
return
}
lock := new(sync.Mutex)
in := rawLogger{
out: rawLog,
prefix: []byte("<- "),
lock: lock,
}
out := rawLogger{
out: rawLog,
prefix: []byte("-> "),
lock: lock,
}
in.other, out.other = &out, &in
xmppConfig.InLog = &in
xmppConfig.OutLog = &out
defer in.flush()
defer out.flush()
}
if dialer != nil {
info(term, "Making connection to "+addr+" via proxy")
if xmppConfig.Conn, err = dialer.Dial("tcp", addr); err != nil {
alert(term, "Failed to connect via proxy: "+err.Error())
return
}
}
conn, err := xmpp.Dial(addr, user, domain, password, xmppConfig)
if err != nil {
alert(term, "Failed to connect to XMPP server: "+err.Error())
return
}
s := Session{
account: config.Account,
conn: conn,
term: term,
conversations: make(map[string]*otr.Conversation),
knownStates: make(map[string]string),
privateKey: new(otr.PrivateKey),
config: config,
pendingRosterChan: make(chan *rosterEdit),
pendingSubscribes: make(map[string]string),
lastActionTime: time.Now(),
}
info(term, "Fetching roster")
//var rosterReply chan xmpp.Stanza
rosterReply, _, err := s.conn.RequestRoster()
if err != nil {
alert(term, "Failed to request roster: "+err.Error())
return
}
conn.SignalPresence("")
s.input = Input{
term: term,
uidComplete: new(priorityList),
}
commandChan := make(chan interface{})
go s.input.ProcessCommands(commandChan)
stanzaChan := make(chan xmpp.Stanza)
go s.readMessages(stanzaChan)
s.privateKey.Parse(config.PrivateKey)
s.timeouts = make(map[xmpp.Cookie]time.Time)
info(term, fmt.Sprintf("Your fingerprint is %x", s.privateKey.Fingerprint()))
ticker := time.NewTicker(1 * time.Second)
MainLoop:
for {
select {
case now := <-ticker.C:
haveExpired := false
for _, expiry := range s.timeouts {
if now.After(expiry) {
haveExpired = true
break
}
}
if !haveExpired {
continue
}
newTimeouts := make(map[xmpp.Cookie]time.Time)
for cookie, expiry := range s.timeouts {
if now.After(expiry) {
s.conn.Cancel(cookie)
} else {
newTimeouts[cookie] = expiry
}
}
s.timeouts = newTimeouts
case edit := <-s.pendingRosterChan:
if !edit.isComplete {
info(s.term, "Please edit "+edit.fileName+" and run /rostereditdone when complete")
s.pendingRosterEdit = edit
continue
}
if s.processEditedRoster(edit) {
s.pendingRosterEdit = nil
} else {
alert(s.term, "Please reedit file and run /rostereditdone again")
}
case rosterStanza, ok := <-rosterReply:
if !ok {
alert(s.term, "Failed to read roster: "+err.Error())
return
}
if s.roster, err = xmpp.ParseRoster(rosterStanza); err != nil {
alert(s.term, "Failed to parse roster: "+err.Error())
return
}
for _, entry := range s.roster {
s.input.AddUser(entry.Jid)
}
info(s.term, "Roster received")
case cmd, ok := <-commandChan:
if !ok {
warn(term, "Exiting because command channel closed")
break MainLoop
}
s.lastActionTime = time.Now()
switch cmd := cmd.(type) {
case quitCommand:
for to, conversation := range s.conversations {
msgs := conversation.End()
for _, msg := range msgs {
s.conn.Send(to, string(msg))
}
}
break MainLoop
case versionCommand:
replyChan, cookie, err := s.conn.SendIQ(cmd.User, "get", xmpp.VersionQuery{})
if err != nil {
alert(s.term, "Error sending version request: "+err.Error())
continue
}
s.timeouts[cookie] = time.Now().Add(5 * time.Second)
go s.awaitVersionReply(replyChan, cmd.User)
case rosterCommand:
info(s.term, "Current roster:")
maxLen := 0
for _, item := range s.roster {
if maxLen < len(item.Jid) {
maxLen = len(item.Jid)
}
}
for _, item := range s.roster {
state, ok := s.knownStates[item.Jid]
line := ""
if ok {
line += "[*] "
} else if cmd.OnlineOnly {
continue
} else {
line += "[ ] "
}
line += item.Jid
numSpaces := 1 + (maxLen - len(item.Jid))
for i := 0; i < numSpaces; i++ {
line += " "
}
line += item.Subscription + "\t" + item.Name
if ok {
line += "\t" + state
}
info(s.term, line)
}
case rosterEditCommand:
if s.pendingRosterEdit != nil {
warn(s.term, "Aborting previous roster edit")
s.pendingRosterEdit = nil
}
rosterCopy := make([]xmpp.RosterEntry, len(s.roster))
copy(rosterCopy, s.roster)
go s.editRoster(rosterCopy)
case rosterEditDoneCommand:
if s.pendingRosterEdit == nil {
warn(s.term, "No roster edit in progress. Use /rosteredit to start one")
continue
}
go s.loadEditedRoster(*s.pendingRosterEdit)
case toggleStatusUpdatesCommand:
s.config.HideStatusUpdates = !s.config.HideStatusUpdates
s.config.Save()
// Tell the user the current state of the statuses
if s.config.HideStatusUpdates {
info(s.term, "Status updated disabled")
} else {
info(s.term, "Status updates enabled")
}
case confirmCommand:
s.handleConfirmOrDeny(cmd.User, true /* confirm */)
case denyCommand:
s.handleConfirmOrDeny(cmd.User, false /* deny */)
case addCommand:
s.conn.SendPresence(cmd.User, "subscribe", "" /* generate id */)
case msgCommand:
conversation, ok := s.conversations[cmd.to]
if (!ok || !conversation.IsEncrypted()) && config.ShouldEncryptTo(cmd.to) {
warn(s.term, fmt.Sprintf("Did not send: no encryption established with %s", cmd.to))
continue
}
var msgs [][]byte
message := []byte(cmd.msg)
// Automatically tag all outgoing plaintext
// messages with a whitespace tag that
// indicates that we support OTR.
if config.OTRAutoAppendTag &&
!bytes.Contains(message, []byte("?OTR")) &&
(!ok || !conversation.IsEncrypted()) {
message = append(message, OTRWhitespaceTag...)
}
if ok {
var err error
msgs, err = conversation.Send(message)
if err != nil {
alert(s.term, err.Error())
break
}
} else {
msgs = [][]byte{[]byte(message)}
}
for _, message := range msgs {
s.conn.Send(cmd.to, string(message))
}
case otrCommand:
s.conn.Send(string(cmd.User), otr.QueryMessage)
case otrInfoCommand:
info(term, fmt.Sprintf("Your OTR fingerprint is %x", s.privateKey.Fingerprint()))
for to, conversation := range s.conversations {
if conversation.IsEncrypted() {
info(s.term, fmt.Sprintf("Secure session with %s underway:", to))
printConversationInfo(s, to, conversation)
}
}
case endOTRCommand:
to := string(cmd.User)
conversation, ok := s.conversations[to]
if !ok {
alert(s.term, "No secure session established")
break
}
msgs := conversation.End()
for _, msg := range msgs {
s.conn.Send(to, string(msg))
}
case authQACommand:
to := string(cmd.User)
conversation, ok := s.conversations[to]
if !ok {
alert(s.term, "Can't authenticate without a secure conversation established")
break
}
msgs, err := conversation.Authenticate(cmd.Question, []byte(cmd.Secret))
if err != nil {
alert(s.term, "Error while starting authentication with "+to+": "+err.Error())
}
for _, msg := range msgs {
s.conn.Send(to, string(msg))
}
case authOobCommand:
fpr, err := hex.DecodeString(cmd.Fingerprint)
if err != nil {
alert(s.term, fmt.Sprintf("Invalid fingerprint %s - not authenticated", cmd.Fingerprint))
break
}
existing := s.config.UserIdForFingerprint(fpr)
if len(existing) != 0 {
alert(s.term, fmt.Sprintf("Fingerprint %s already belongs to %s", cmd.Fingerprint, existing))
break
}
s.config.KnownFingerprints = append(s.config.KnownFingerprints, KnownFingerprint{fingerprint: fpr, UserId: cmd.User})
s.config.Save()
info(s.term, fmt.Sprintf("Saved manually verified fingerprint %s for %s", cmd.Fingerprint, cmd.User))
case awayCommand:
s.conn.SignalPresence("away")
case chatCommand:
s.conn.SignalPresence("chat")
case dndCommand:
s.conn.SignalPresence("dnd")
case xaCommand:
s.conn.SignalPresence("xa")
case onlineCommand:
s.conn.SignalPresence("")
}
case rawStanza, ok := <-stanzaChan:
if !ok {
warn(term, "Exiting because channel to server closed")
break MainLoop
}
switch stanza := rawStanza.Value.(type) {
case *xmpp.ClientMessage:
s.processClientMessage(stanza)
case *xmpp.ClientPresence:
s.processPresence(stanza)
case *xmpp.ClientIQ:
if stanza.Type != "get" && stanza.Type != "set" {
continue
}
reply := s.processIQ(stanza)
if reply == nil {
reply = xmpp.ErrorReply{
Type: "cancel",
Error: xmpp.ErrorBadRequest{},
}
}
if err := s.conn.SendIQReply(stanza.From, "result", stanza.Id, reply); err != nil {
alert(term, "Failed to send IQ message: "+err.Error())
}
default:
info(term, fmt.Sprintf("%s %s", rawStanza.Name, rawStanza.Value))
}
}
}
os.Stdout.Write([]byte("\n"))
}
func main() {
runtime.GOMAXPROCS(2)
flag.Parse()
if len(*secret) == 0 {
fmt.Fprintf(os.Stderr, "The shared secret must be given as --secret\n")
os.Exit(2)
}
if len(*keyFile) == 0 {
fmt.Fprintf(os.Stderr, "The path to a find containing the public key material to exchange must be given as --key-file\n")
os.Exit(2)
}
pubKeyBytes, err := ioutil.ReadFile(*keyFile)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read key file: %s\n", err)
os.Exit(2)
}
const maxBody = 4096
if limit := maxBody - 24 - secretbox.Overhead; len(pubKeyBytes) > limit {
fmt.Fprintf(os.Stderr, "--key-file is too large (%d bytes of a maximum of %d)\n", len(pubKeyBytes), limit)
os.Exit(2)
}
// Run scrypt on a goroutine so that we can overlap it with the network
// delay.
keyChan := make(chan []byte)
go deriveKey(keyChan, *secret)
var dialer proxy.Dialer
dialer = proxy.Direct
if len(*torProxy) > 0 {
fmt.Fprintf(os.Stderr, "Using SOCKS5 proxy at %s\n", *torProxy)
dialer, err = proxy.SOCKS5("tcp", *torProxy, nil, dialer)
if err != nil {
panic(err)
}
}
fmt.Fprintf(os.Stderr, "Starting TCP connection to %s\n", *server)
rawConn, err := dialer.Dial("tcp", *server)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to connect to server: %s\n", err)
os.Exit(2)
}
var conn net.Conn
if *useTLS {
hostname, _, err := net.SplitHostPort(*server)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to split %s into host and post: %s\n", *server, err)
os.Exit(2)
}
tlsConn := tls.Client(rawConn, &tls.Config{
ServerName: hostname,
})
fmt.Fprintf(os.Stderr, "Starting TLS handshake\n")
if err := tlsConn.Handshake(); err != nil {
rawConn.Close()
fmt.Fprintf(os.Stderr, "TLS handshake failed: %s\n", err)
os.Exit(2)
}
conn = tlsConn
} else {
conn = rawConn
}
defer conn.Close()
var keySlice []byte
select {
case keySlice = <-keyChan:
default:
fmt.Fprintf(os.Stderr, "Waiting for key derivation to complete. This may take some time.\n")
keySlice = <-keyChan
}
var key [32]byte
copy(key[:], keySlice)
mac := hmac.New(sha256.New, key[:])
mac.Write(pubKeyBytes)
nonceSlice := mac.Sum(nil)
var nonce [24]byte
copy(nonce[:], nonceSlice)
box := make([]byte, len(nonce)+secretbox.Overhead+len(pubKeyBytes))
copy(box, nonce[:])
secretbox.Seal(box[len(nonce):len(nonce)], pubKeyBytes, &nonce, &key)
h := sha256.New()
h.Write(key[:])
tag := h.Sum(nil)
body := bytes.NewReader(box)
request, err := http.NewRequest("POST", "http://"+*server+"/exchange/"+hex.EncodeToString(tag), body)
if err != nil {
panic(err)
}
request.ContentLength = int64(len(box))
request.Header.Add("Content-Type", "application/octet-stream")
request.Write(conn)
fmt.Fprintf(os.Stderr, "Request sent. Waiting for HTTP reply\n")
replyReader := bufio.NewReader(conn)
response, err := http.ReadResponse(replyReader, request)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading reply from server: %s\n", err)
os.Exit(2)
}
switch response.StatusCode {
case 409:
fmt.Fprintf(os.Stderr, "The transaction failed because this key has been used recently by two other parties.\n")
os.Exit(2)
case 204:
fmt.Fprintf(os.Stderr, "Material submitted, but the other party has yet to start the process. Try again later with the same arguments.\n")
os.Exit(1)
case 200:
r := &io.LimitedReader{R: response.Body, N: maxBody + 1}
body, err := ioutil.ReadAll(r)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading from server: %s\n", err)
os.Exit(2)
}
if len(body) > maxBody {
fmt.Fprintf(os.Stderr, "Reply from server is too large\n")
os.Exit(2)
}
if len(body) < len(nonce)+secretbox.Overhead {
fmt.Fprintf(os.Stderr, "Reply from server is too short to be valid: %x\n", body)
os.Exit(2)
}
copy(nonce[:], body)
unsealed, ok := secretbox.Open(nil, body[len(nonce):], &nonce, &key)
if !ok {
fmt.Fprintf(os.Stderr, "Failed to authenticate reply from server\n")
os.Exit(2)
}
os.Stdout.Write(unsealed)
default:
fmt.Fprintf(os.Stderr, "HTTP error from server: %s\n", response.Status)
io.Copy(os.Stderr, response.Body)
os.Exit(2)
}
}
func main() {
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
if flag.NArg() != 0 {
usage()
}
// Setup the TLS client configuration.
config := &tls.Config{ServerName: *host}
if *skipVerify {
if *verbose {
log.Print("WARNING: Skipping certificate verification")
}
config.InsecureSkipVerify = true
}
if *certFile != "" {
data, err := ioutil.ReadFile(*certFile)
if err != nil {
log.Fatalf("could not read certificate file: %s", err)
}
p := x509.NewCertPool()
if ok := p.AppendCertsFromPEM(data); !ok {
log.Fatalf("could not parse certificates in %q", *certFile)
}
config.RootCAs = p
}
// Determine how we should converse with the remote server.
fn, ok := tlsMethods[*method]
if !ok {
log.Fatalf("unknown connection method %q", method)
}
// Determine the proxy dialer method.
var dialer proxy.Dialer = proxy.Direct
if *proxyURL != "" {
u, err := url.Parse(*proxyURL)
if err != nil {
log.Fatalf("failed to parse proxy url: %s", err)
}
d, err := proxy.FromURL(u, dialer)
if err != nil {
log.Fatal(err)
}
dialer = d
usualHandshakeRTT = proxyHandshakeRTT
}
// Connect to the remote server.
c, err := dialer.Dial("tcp", net.JoinHostPort(*host, *port))
if err != nil {
log.Fatalf("could not dial remote host: %s", err)
}
// Wrap the connection in a shim so we can sniff the TLS traffic.
s := &shim{Conn: c}
// Run our predetermined TLS conversation.
// If successful, the connection will be automatically closed.
if err := fn(s, config); err != nil {
s.Close()
log.Fatalf("error in TLS conversation: %s", err)
}
// Warn if the TLS handshake took too long.
rtt := s.HandshakeRTT()
if rtt > usualHandshakeRTT {
log.Printf("WARNING: the TLS handshake took too long (%s)\n", rtt)
}
// Show the server's time in Unix format.
if *showTime {
fmt.Println(s.ServerTime().Format(time.UnixDate))
}
// Go no further if we don't have to set the clock.
if *dontSetClock {
return
}
// Check for unreasonable time values.
t := s.ServerTime().Add(rtt)
if t.After(maxReasonableTime) {
log.Fatal("remote time is too far in the future")
}
if t.Before(recentCompileTime) {
log.Fatal("remote time is too far in the past")
}
// Set the system clock.
if err := setClock(t); err != nil {
log.Fatal(err)
}
}