source: code/trunk/downstream.go@ 758

Last change on this file since 758 was 758, checked in by contact, 4 years ago

Don't forward duplicate JOIN commands

Closes: ​https://todo.sr.ht/~emersion/soju/171
File size: 74.3 KB
Line 
1package soju
2
3import (
4 "context"
5 "crypto/tls"
6 "encoding/base64"
7 "errors"
8 "fmt"
9 "io"
10 "net"
11 "strconv"
12 "strings"
13 "time"
14
15 "github.com/emersion/go-sasl"
16 "golang.org/x/crypto/bcrypt"
17 "gopkg.in/irc.v3"
18)
19
20type ircError struct {
21 Message *irc.Message
22}
23
24func (err ircError) Error() string {
25 return err.Message.String()
26}
27
28func newUnknownCommandError(cmd string) ircError {
29 return ircError{&irc.Message{
30 Command: irc.ERR_UNKNOWNCOMMAND,
31 Params: []string{
32 "*",
33 cmd,
34 "Unknown command",
35 },
36 }}
37}
38
39func newNeedMoreParamsError(cmd string) ircError {
40 return ircError{&irc.Message{
41 Command: irc.ERR_NEEDMOREPARAMS,
42 Params: []string{
43 "*",
44 cmd,
45 "Not enough parameters",
46 },
47 }}
48}
49
50func newChatHistoryError(subcommand string, target string) ircError {
51 return ircError{&irc.Message{
52 Command: "FAIL",
53 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
54 }}
55}
56
57// authError is an authentication error.
58type authError struct {
59 // Internal error cause. This will not be revealed to the user.
60 err error
61 // Error cause which can safely be sent to the user without compromising
62 // security.
63 reason string
64}
65
66func (err *authError) Error() string {
67 return err.err.Error()
68}
69
70func (err *authError) Unwrap() error {
71 return err.err
72}
73
74// authErrorReason returns the user-friendly reason of an authentication
75// failure.
76func authErrorReason(err error) string {
77 if authErr, ok := err.(*authError); ok {
78 return authErr.reason
79 } else {
80 return "Authentication failed"
81 }
82}
83
84func newInvalidUsernameOrPasswordError(err error) error {
85 return &authError{
86 err: err,
87 reason: "Invalid username or password",
88 }
89}
90
91func parseBouncerNetID(subcommand, s string) (int64, error) {
92 id, err := strconv.ParseInt(s, 10, 64)
93 if err != nil {
94 return 0, ircError{&irc.Message{
95 Command: "FAIL",
96 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
97 }}
98 }
99 return id, nil
100}
101
102func fillNetworkAddrAttrs(attrs irc.Tags, network *Network) {
103 u, err := network.URL()
104 if err != nil {
105 return
106 }
107
108 hasHostPort := true
109 switch u.Scheme {
110 case "ircs":
111 attrs["tls"] = irc.TagValue("1")
112 case "irc+insecure":
113 attrs["tls"] = irc.TagValue("0")
114 default: // e.g. unix://
115 hasHostPort = false
116 }
117 if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
118 attrs["host"] = irc.TagValue(host)
119 attrs["port"] = irc.TagValue(port)
120 } else if hasHostPort {
121 attrs["host"] = irc.TagValue(u.Host)
122 }
123}
124
125func getNetworkAttrs(network *network) irc.Tags {
126 state := "disconnected"
127 if uc := network.conn; uc != nil {
128 state = "connected"
129 }
130
131 attrs := irc.Tags{
132 "name": irc.TagValue(network.GetName()),
133 "state": irc.TagValue(state),
134 "nickname": irc.TagValue(GetNick(&network.user.User, &network.Network)),
135 }
136
137 if network.Username != "" {
138 attrs["username"] = irc.TagValue(network.Username)
139 }
140 if realname := GetRealname(&network.user.User, &network.Network); realname != "" {
141 attrs["realname"] = irc.TagValue(realname)
142 }
143
144 fillNetworkAddrAttrs(attrs, &network.Network)
145
146 return attrs
147}
148
149func networkAddrFromAttrs(attrs irc.Tags) string {
150 host, ok := attrs.GetTag("host")
151 if !ok {
152 return ""
153 }
154
155 addr := host
156 if port, ok := attrs.GetTag("port"); ok {
157 addr += ":" + port
158 }
159
160 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
161 addr = "irc+insecure://" + tlsStr
162 }
163
164 return addr
165}
166
167func updateNetworkAttrs(record *Network, attrs irc.Tags, subcommand string) error {
168 addrAttrs := irc.Tags{}
169 fillNetworkAddrAttrs(addrAttrs, record)
170
171 updateAddr := false
172 for k, v := range attrs {
173 s := string(v)
174 switch k {
175 case "host", "port", "tls":
176 updateAddr = true
177 addrAttrs[k] = v
178 case "name":
179 record.Name = s
180 case "nickname":
181 record.Nick = s
182 case "username":
183 record.Username = s
184 case "realname":
185 record.Realname = s
186 case "pass":
187 record.Pass = s
188 default:
189 return ircError{&irc.Message{
190 Command: "FAIL",
191 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
192 }}
193 }
194 }
195
196 if updateAddr {
197 record.Addr = networkAddrFromAttrs(addrAttrs)
198 if record.Addr == "" {
199 return ircError{&irc.Message{
200 Command: "FAIL",
201 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
202 }}
203 }
204 }
205
206 return nil
207}
208
209// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
210// '*' and '?' break masks, '$' breaks server masks in PRIVMSG/NOTICE,
211// "*" is the reserved nickname for registration, ',' breaks lists
212const illegalNickChars = " :@!*?$,"
213
214// permanentDownstreamCaps is the list of always-supported downstream
215// capabilities.
216var permanentDownstreamCaps = map[string]string{
217 "batch": "",
218 "cap-notify": "",
219 "echo-message": "",
220 "invite-notify": "",
221 "message-tags": "",
222 "server-time": "",
223 "setname": "",
224
225 "soju.im/bouncer-networks": "",
226 "soju.im/bouncer-networks-notify": "",
227}
228
229// needAllDownstreamCaps is the list of downstream capabilities that
230// require support from all upstreams to be enabled
231var needAllDownstreamCaps = map[string]string{
232 "account-notify": "",
233 "account-tag": "",
234 "away-notify": "",
235 "extended-join": "",
236 "multi-prefix": "",
237
238 "draft/extended-monitor": "",
239}
240
241// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
242// through from the upstream server to downstream clients.
243//
244// This is only effective in single-upstream mode.
245var passthroughIsupport = map[string]bool{
246 "AWAYLEN": true,
247 "BOT": true,
248 "CHANLIMIT": true,
249 "CHANMODES": true,
250 "CHANNELLEN": true,
251 "CHANTYPES": true,
252 "CLIENTTAGDENY": true,
253 "ELIST": true,
254 "EXCEPTS": true,
255 "EXTBAN": true,
256 "HOSTLEN": true,
257 "INVEX": true,
258 "KICKLEN": true,
259 "MAXLIST": true,
260 "MAXTARGETS": true,
261 "MODES": true,
262 "MONITOR": true,
263 "NAMELEN": true,
264 "NETWORK": true,
265 "NICKLEN": true,
266 "PREFIX": true,
267 "SAFELIST": true,
268 "TARGMAX": true,
269 "TOPICLEN": true,
270 "USERLEN": true,
271 "UTF8ONLY": true,
272 "WHOX": true,
273}
274
275type downstreamSASL struct {
276 server sasl.Server
277 plainUsername, plainPassword string
278}
279
280type downstreamConn struct {
281 conn
282
283 id uint64
284
285 registered bool
286 user *user
287 nick string
288 nickCM string
289 rawUsername string
290 networkName string
291 clientName string
292 realname string
293 hostname string
294 account string // RPL_LOGGEDIN/OUT state
295 password string // empty after authentication
296 network *network // can be nil
297 isMultiUpstream bool
298
299 negotiatingCaps bool
300 capVersion int
301 supportedCaps map[string]string
302 caps map[string]bool
303 sasl *downstreamSASL
304
305 lastBatchRef uint64
306
307 monitored casemapMap
308}
309
310func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
311 remoteAddr := ic.RemoteAddr().String()
312 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
313 options := connOptions{Logger: logger}
314 dc := &downstreamConn{
315 conn: *newConn(srv, ic, &options),
316 id: id,
317 nick: "*",
318 nickCM: "*",
319 supportedCaps: make(map[string]string),
320 caps: make(map[string]bool),
321 monitored: newCasemapMap(0),
322 }
323 dc.hostname = remoteAddr
324 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
325 dc.hostname = host
326 }
327 for k, v := range permanentDownstreamCaps {
328 dc.supportedCaps[k] = v
329 }
330 dc.supportedCaps["sasl"] = "PLAIN"
331 // TODO: this is racy, we should only enable chathistory after
332 // authentication and then check that user.msgStore implements
333 // chatHistoryMessageStore
334 if srv.Config().LogPath != "" {
335 dc.supportedCaps["draft/chathistory"] = ""
336 }
337 return dc
338}
339
340func (dc *downstreamConn) prefix() *irc.Prefix {
341 return &irc.Prefix{
342 Name: dc.nick,
343 User: dc.user.Username,
344 Host: dc.hostname,
345 }
346}
347
348func (dc *downstreamConn) forEachNetwork(f func(*network)) {
349 if dc.network != nil {
350 f(dc.network)
351 } else if dc.isMultiUpstream {
352 dc.user.forEachNetwork(f)
353 }
354}
355
356func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
357 if dc.network == nil && !dc.isMultiUpstream {
358 return
359 }
360 dc.user.forEachUpstream(func(uc *upstreamConn) {
361 if dc.network != nil && uc.network != dc.network {
362 return
363 }
364 f(uc)
365 })
366}
367
368// upstream returns the upstream connection, if any. If there are zero or if
369// there are multiple upstream connections, it returns nil.
370func (dc *downstreamConn) upstream() *upstreamConn {
371 if dc.network == nil {
372 return nil
373 }
374 return dc.network.conn
375}
376
377func isOurNick(net *network, nick string) bool {
378 // TODO: this doesn't account for nick changes
379 if net.conn != nil {
380 return net.casemap(nick) == net.conn.nickCM
381 }
382 // We're not currently connected to the upstream connection, so we don't
383 // know whether this name is our nickname. Best-effort: use the network's
384 // configured nickname and hope it was the one being used when we were
385 // connected.
386 return net.casemap(nick) == net.casemap(GetNick(&net.user.User, &net.Network))
387}
388
389// marshalEntity converts an upstream entity name (ie. channel or nick) into a
390// downstream entity name.
391//
392// This involves adding a "/<network>" suffix if the entity isn't the current
393// user.
394func (dc *downstreamConn) marshalEntity(net *network, name string) string {
395 if isOurNick(net, name) {
396 return dc.nick
397 }
398 name = partialCasemap(net.casemap, name)
399 if dc.network != nil {
400 if dc.network != net {
401 panic("soju: tried to marshal an entity for another network")
402 }
403 return name
404 }
405 return name + "/" + net.GetName()
406}
407
408func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
409 if isOurNick(net, prefix.Name) {
410 return dc.prefix()
411 }
412 prefix.Name = partialCasemap(net.casemap, prefix.Name)
413 if dc.network != nil {
414 if dc.network != net {
415 panic("soju: tried to marshal a user prefix for another network")
416 }
417 return prefix
418 }
419 return &irc.Prefix{
420 Name: prefix.Name + "/" + net.GetName(),
421 User: prefix.User,
422 Host: prefix.Host,
423 }
424}
425
426// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
427// nick) into an upstream entity name.
428//
429// This involves removing the "/<network>" suffix.
430func (dc *downstreamConn) unmarshalEntityNetwork(name string) (*network, string, error) {
431 if dc.network != nil {
432 return dc.network, name, nil
433 }
434 if !dc.isMultiUpstream {
435 return nil, "", ircError{&irc.Message{
436 Command: irc.ERR_NOSUCHCHANNEL,
437 Params: []string{dc.nick, name, "Cannot interact with channels and users on the bouncer connection. Did you mean to use a specific network?"},
438 }}
439 }
440
441 var net *network
442 if i := strings.LastIndexByte(name, '/'); i >= 0 {
443 network := name[i+1:]
444 name = name[:i]
445
446 for _, n := range dc.user.networks {
447 if network == n.GetName() {
448 net = n
449 break
450 }
451 }
452 }
453
454 if net == nil {
455 return nil, "", ircError{&irc.Message{
456 Command: irc.ERR_NOSUCHCHANNEL,
457 Params: []string{dc.nick, name, "Missing network suffix in name"},
458 }}
459 }
460
461 return net, name, nil
462}
463
464// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
465// upstream connection and fails if the upstream is disconnected.
466func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
467 net, name, err := dc.unmarshalEntityNetwork(name)
468 if err != nil {
469 return nil, "", err
470 }
471
472 if net.conn == nil {
473 return nil, "", ircError{&irc.Message{
474 Command: irc.ERR_NOSUCHCHANNEL,
475 Params: []string{dc.nick, name, "Disconnected from upstream network"},
476 }}
477 }
478
479 return net.conn, name, nil
480}
481
482func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
483 if dc.upstream() != nil {
484 return text
485 }
486 // TODO: smarter parsing that ignores URLs
487 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
488}
489
490func (dc *downstreamConn) ReadMessage() (*irc.Message, error) {
491 msg, err := dc.conn.ReadMessage()
492 if err != nil {
493 return nil, err
494 }
495 dc.srv.metrics.downstreamInMessagesTotal.Inc()
496 return msg, nil
497}
498
499func (dc *downstreamConn) readMessages(ch chan<- event) error {
500 for {
501 msg, err := dc.ReadMessage()
502 if errors.Is(err, io.EOF) {
503 break
504 } else if err != nil {
505 return fmt.Errorf("failed to read IRC command: %v", err)
506 }
507
508 ch <- eventDownstreamMessage{msg, dc}
509 }
510
511 return nil
512}
513
514// SendMessage sends an outgoing message.
515//
516// This can only called from the user goroutine.
517func (dc *downstreamConn) SendMessage(msg *irc.Message) {
518 if !dc.caps["message-tags"] {
519 if msg.Command == "TAGMSG" {
520 return
521 }
522 msg = msg.Copy()
523 for name := range msg.Tags {
524 supported := false
525 switch name {
526 case "time":
527 supported = dc.caps["server-time"]
528 case "account":
529 supported = dc.caps["account"]
530 }
531 if !supported {
532 delete(msg.Tags, name)
533 }
534 }
535 }
536 if !dc.caps["batch"] && msg.Tags["batch"] != "" {
537 msg = msg.Copy()
538 delete(msg.Tags, "batch")
539 }
540 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
541 msg.Params = msg.Params[:1]
542 }
543 if msg.Command == "SETNAME" && !dc.caps["setname"] {
544 return
545 }
546 if msg.Command == "AWAY" && !dc.caps["away-notify"] {
547 return
548 }
549 if msg.Command == "ACCOUNT" && !dc.caps["account-notify"] {
550 return
551 }
552
553 dc.srv.metrics.downstreamOutMessagesTotal.Inc()
554 dc.conn.SendMessage(context.TODO(), msg)
555}
556
557func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
558 dc.lastBatchRef++
559 ref := fmt.Sprintf("%v", dc.lastBatchRef)
560
561 if dc.caps["batch"] {
562 dc.SendMessage(&irc.Message{
563 Tags: tags,
564 Prefix: dc.srv.prefix(),
565 Command: "BATCH",
566 Params: append([]string{"+" + ref, typ}, params...),
567 })
568 }
569
570 f(irc.TagValue(ref))
571
572 if dc.caps["batch"] {
573 dc.SendMessage(&irc.Message{
574 Prefix: dc.srv.prefix(),
575 Command: "BATCH",
576 Params: []string{"-" + ref},
577 })
578 }
579}
580
581// sendMessageWithID sends an outgoing message with the specified internal ID.
582func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
583 dc.SendMessage(msg)
584
585 if id == "" || !dc.messageSupportsBacklog(msg) {
586 return
587 }
588
589 dc.sendPing(id)
590}
591
592// advanceMessageWithID advances history to the specified message ID without
593// sending a message. This is useful e.g. for self-messages when echo-message
594// isn't enabled.
595func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
596 if id == "" || !dc.messageSupportsBacklog(msg) {
597 return
598 }
599
600 dc.sendPing(id)
601}
602
603// ackMsgID acknowledges that a message has been received.
604func (dc *downstreamConn) ackMsgID(id string) {
605 netID, entity, err := parseMsgID(id, nil)
606 if err != nil {
607 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
608 return
609 }
610
611 network := dc.user.getNetworkByID(netID)
612 if network == nil {
613 return
614 }
615
616 network.delivered.StoreID(entity, dc.clientName, id)
617}
618
619func (dc *downstreamConn) sendPing(msgID string) {
620 token := "soju-msgid-" + msgID
621 dc.SendMessage(&irc.Message{
622 Command: "PING",
623 Params: []string{token},
624 })
625}
626
627func (dc *downstreamConn) handlePong(token string) {
628 if !strings.HasPrefix(token, "soju-msgid-") {
629 dc.logger.Printf("received unrecognized PONG token %q", token)
630 return
631 }
632 msgID := strings.TrimPrefix(token, "soju-msgid-")
633 dc.ackMsgID(msgID)
634}
635
636// marshalMessage re-formats a message coming from an upstream connection so
637// that it's suitable for being sent on this downstream connection. Only
638// messages that may appear in logs are supported, except MODE messages which
639// may only appear in single-upstream mode.
640func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
641 msg = msg.Copy()
642 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
643
644 if dc.network != nil {
645 return msg
646 }
647
648 switch msg.Command {
649 case "PRIVMSG", "NOTICE", "TAGMSG":
650 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
651 case "NICK":
652 // Nick change for another user
653 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
654 case "JOIN", "PART":
655 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
656 case "KICK":
657 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
658 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
659 case "TOPIC":
660 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
661 case "QUIT", "SETNAME":
662 // This space is intentionally left blank
663 default:
664 panic(fmt.Sprintf("unexpected %q message", msg.Command))
665 }
666
667 return msg
668}
669
670func (dc *downstreamConn) handleMessage(ctx context.Context, msg *irc.Message) error {
671 ctx, cancel := dc.conn.NewContext(ctx)
672 defer cancel()
673
674 ctx, cancel = context.WithTimeout(ctx, handleDownstreamMessageTimeout)
675 defer cancel()
676
677 switch msg.Command {
678 case "QUIT":
679 return dc.Close()
680 default:
681 if dc.registered {
682 return dc.handleMessageRegistered(ctx, msg)
683 } else {
684 return dc.handleMessageUnregistered(ctx, msg)
685 }
686 }
687}
688
689func (dc *downstreamConn) handleMessageUnregistered(ctx context.Context, msg *irc.Message) error {
690 switch msg.Command {
691 case "NICK":
692 var nick string
693 if err := parseMessageParams(msg, &nick); err != nil {
694 return err
695 }
696 if nick == "" || strings.ContainsAny(nick, illegalNickChars) {
697 return ircError{&irc.Message{
698 Command: irc.ERR_ERRONEUSNICKNAME,
699 Params: []string{dc.nick, nick, "contains illegal characters"},
700 }}
701 }
702 nickCM := casemapASCII(nick)
703 if nickCM == serviceNickCM {
704 return ircError{&irc.Message{
705 Command: irc.ERR_NICKNAMEINUSE,
706 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
707 }}
708 }
709 dc.nick = nick
710 dc.nickCM = nickCM
711 case "USER":
712 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
713 return err
714 }
715 case "PASS":
716 if err := parseMessageParams(msg, &dc.password); err != nil {
717 return err
718 }
719 case "CAP":
720 var subCmd string
721 if err := parseMessageParams(msg, &subCmd); err != nil {
722 return err
723 }
724 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
725 return err
726 }
727 case "AUTHENTICATE":
728 credentials, err := dc.handleAuthenticateCommand(msg)
729 if err != nil {
730 return err
731 } else if credentials == nil {
732 break
733 }
734
735 if err := dc.authenticate(ctx, credentials.plainUsername, credentials.plainPassword); err != nil {
736 dc.logger.Printf("SASL authentication error for user %q: %v", credentials.plainUsername, err)
737 dc.endSASL(&irc.Message{
738 Prefix: dc.srv.prefix(),
739 Command: irc.ERR_SASLFAIL,
740 Params: []string{dc.nick, authErrorReason(err)},
741 })
742 break
743 }
744
745 // Technically we should send RPL_LOGGEDIN here. However we use
746 // RPL_LOGGEDIN to mirror the upstream connection status. Let's
747 // see how many clients that breaks. See:
748 // https://github.com/ircv3/ircv3-specifications/pull/476
749 dc.endSASL(nil)
750 case "BOUNCER":
751 var subcommand string
752 if err := parseMessageParams(msg, &subcommand); err != nil {
753 return err
754 }
755
756 switch strings.ToUpper(subcommand) {
757 case "BIND":
758 var idStr string
759 if err := parseMessageParams(msg, nil, &idStr); err != nil {
760 return err
761 }
762
763 if dc.user == nil {
764 return ircError{&irc.Message{
765 Command: "FAIL",
766 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
767 }}
768 }
769
770 id, err := parseBouncerNetID(subcommand, idStr)
771 if err != nil {
772 return err
773 }
774
775 var match *network
776 dc.user.forEachNetwork(func(net *network) {
777 if net.ID == id {
778 match = net
779 }
780 })
781 if match == nil {
782 return ircError{&irc.Message{
783 Command: "FAIL",
784 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
785 }}
786 }
787
788 dc.networkName = match.GetName()
789 }
790 default:
791 dc.logger.Printf("unhandled message: %v", msg)
792 return newUnknownCommandError(msg.Command)
793 }
794 if dc.rawUsername != "" && dc.nick != "*" && !dc.negotiatingCaps {
795 return dc.register(ctx)
796 }
797 return nil
798}
799
800func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
801 cmd = strings.ToUpper(cmd)
802
803 switch cmd {
804 case "LS":
805 if len(args) > 0 {
806 var err error
807 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
808 return err
809 }
810 }
811 if !dc.registered && dc.capVersion >= 302 {
812 // Let downstream show everything it supports, and trim
813 // down the available capabilities when upstreams are
814 // known.
815 for k, v := range needAllDownstreamCaps {
816 dc.supportedCaps[k] = v
817 }
818 }
819
820 caps := make([]string, 0, len(dc.supportedCaps))
821 for k, v := range dc.supportedCaps {
822 if dc.capVersion >= 302 && v != "" {
823 caps = append(caps, k+"="+v)
824 } else {
825 caps = append(caps, k)
826 }
827 }
828
829 // TODO: multi-line replies
830 dc.SendMessage(&irc.Message{
831 Prefix: dc.srv.prefix(),
832 Command: "CAP",
833 Params: []string{dc.nick, "LS", strings.Join(caps, " ")},
834 })
835
836 if dc.capVersion >= 302 {
837 // CAP version 302 implicitly enables cap-notify
838 dc.caps["cap-notify"] = true
839 }
840
841 if !dc.registered {
842 dc.negotiatingCaps = true
843 }
844 case "LIST":
845 var caps []string
846 for name, enabled := range dc.caps {
847 if enabled {
848 caps = append(caps, name)
849 }
850 }
851
852 // TODO: multi-line replies
853 dc.SendMessage(&irc.Message{
854 Prefix: dc.srv.prefix(),
855 Command: "CAP",
856 Params: []string{dc.nick, "LIST", strings.Join(caps, " ")},
857 })
858 case "REQ":
859 if len(args) == 0 {
860 return ircError{&irc.Message{
861 Command: err_invalidcapcmd,
862 Params: []string{dc.nick, cmd, "Missing argument in CAP REQ command"},
863 }}
864 }
865
866 // TODO: atomically ack/nak the whole capability set
867 caps := strings.Fields(args[0])
868 ack := true
869 for _, name := range caps {
870 name = strings.ToLower(name)
871 enable := !strings.HasPrefix(name, "-")
872 if !enable {
873 name = strings.TrimPrefix(name, "-")
874 }
875
876 if enable == dc.caps[name] {
877 continue
878 }
879
880 _, ok := dc.supportedCaps[name]
881 if !ok {
882 ack = false
883 break
884 }
885
886 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
887 // cap-notify cannot be disabled with CAP version 302
888 ack = false
889 break
890 }
891
892 dc.caps[name] = enable
893 }
894
895 reply := "NAK"
896 if ack {
897 reply = "ACK"
898 }
899 dc.SendMessage(&irc.Message{
900 Prefix: dc.srv.prefix(),
901 Command: "CAP",
902 Params: []string{dc.nick, reply, args[0]},
903 })
904
905 if !dc.registered {
906 dc.negotiatingCaps = true
907 }
908 case "END":
909 dc.negotiatingCaps = false
910 default:
911 return ircError{&irc.Message{
912 Command: err_invalidcapcmd,
913 Params: []string{dc.nick, cmd, "Unknown CAP command"},
914 }}
915 }
916 return nil
917}
918
919func (dc *downstreamConn) handleAuthenticateCommand(msg *irc.Message) (result *downstreamSASL, err error) {
920 defer func() {
921 if err != nil {
922 dc.sasl = nil
923 }
924 }()
925
926 if !dc.caps["sasl"] {
927 return nil, ircError{&irc.Message{
928 Prefix: dc.srv.prefix(),
929 Command: irc.ERR_SASLFAIL,
930 Params: []string{dc.nick, "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
931 }}
932 }
933 if len(msg.Params) == 0 {
934 return nil, ircError{&irc.Message{
935 Prefix: dc.srv.prefix(),
936 Command: irc.ERR_SASLFAIL,
937 Params: []string{dc.nick, "Missing AUTHENTICATE argument"},
938 }}
939 }
940 if msg.Params[0] == "*" {
941 return nil, ircError{&irc.Message{
942 Prefix: dc.srv.prefix(),
943 Command: irc.ERR_SASLABORTED,
944 Params: []string{dc.nick, "SASL authentication aborted"},
945 }}
946 }
947
948 var resp []byte
949 if dc.sasl == nil {
950 mech := strings.ToUpper(msg.Params[0])
951 var server sasl.Server
952 switch mech {
953 case "PLAIN":
954 server = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
955 dc.sasl.plainUsername = username
956 dc.sasl.plainPassword = password
957 return nil
958 }))
959 default:
960 return nil, ircError{&irc.Message{
961 Prefix: dc.srv.prefix(),
962 Command: irc.ERR_SASLFAIL,
963 Params: []string{dc.nick, fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
964 }}
965 }
966
967 dc.sasl = &downstreamSASL{server: server}
968 } else {
969 // TODO: multi-line messages
970 if msg.Params[0] == "+" {
971 resp = nil
972 } else if resp, err = base64.StdEncoding.DecodeString(msg.Params[0]); err != nil {
973 return nil, ircError{&irc.Message{
974 Prefix: dc.srv.prefix(),
975 Command: irc.ERR_SASLFAIL,
976 Params: []string{dc.nick, "Invalid base64-encoded response"},
977 }}
978 }
979 }
980
981 challenge, done, err := dc.sasl.server.Next(resp)
982 if err != nil {
983 return nil, err
984 } else if done {
985 return dc.sasl, nil
986 } else {
987 challengeStr := "+"
988 if len(challenge) > 0 {
989 challengeStr = base64.StdEncoding.EncodeToString(challenge)
990 }
991
992 // TODO: multi-line messages
993 dc.SendMessage(&irc.Message{
994 Prefix: dc.srv.prefix(),
995 Command: "AUTHENTICATE",
996 Params: []string{challengeStr},
997 })
998 return nil, nil
999 }
1000}
1001
1002func (dc *downstreamConn) endSASL(msg *irc.Message) {
1003 if dc.sasl == nil {
1004 return
1005 }
1006
1007 dc.sasl = nil
1008
1009 if msg != nil {
1010 dc.SendMessage(msg)
1011 } else {
1012 dc.SendMessage(&irc.Message{
1013 Prefix: dc.srv.prefix(),
1014 Command: irc.RPL_SASLSUCCESS,
1015 Params: []string{dc.nick, "SASL authentication successful"},
1016 })
1017 }
1018}
1019
1020func (dc *downstreamConn) setSupportedCap(name, value string) {
1021 prevValue, hasPrev := dc.supportedCaps[name]
1022 changed := !hasPrev || prevValue != value
1023 dc.supportedCaps[name] = value
1024
1025 if !dc.caps["cap-notify"] || !changed {
1026 return
1027 }
1028
1029 cap := name
1030 if value != "" && dc.capVersion >= 302 {
1031 cap = name + "=" + value
1032 }
1033
1034 dc.SendMessage(&irc.Message{
1035 Prefix: dc.srv.prefix(),
1036 Command: "CAP",
1037 Params: []string{dc.nick, "NEW", cap},
1038 })
1039}
1040
1041func (dc *downstreamConn) unsetSupportedCap(name string) {
1042 _, hasPrev := dc.supportedCaps[name]
1043 delete(dc.supportedCaps, name)
1044 delete(dc.caps, name)
1045
1046 if !dc.caps["cap-notify"] || !hasPrev {
1047 return
1048 }
1049
1050 dc.SendMessage(&irc.Message{
1051 Prefix: dc.srv.prefix(),
1052 Command: "CAP",
1053 Params: []string{dc.nick, "DEL", name},
1054 })
1055}
1056
1057func (dc *downstreamConn) updateSupportedCaps() {
1058 supportedCaps := make(map[string]bool)
1059 for cap := range needAllDownstreamCaps {
1060 supportedCaps[cap] = true
1061 }
1062 dc.forEachUpstream(func(uc *upstreamConn) {
1063 for cap, supported := range supportedCaps {
1064 supportedCaps[cap] = supported && uc.caps[cap]
1065 }
1066 })
1067
1068 for cap, supported := range supportedCaps {
1069 if supported {
1070 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
1071 } else {
1072 dc.unsetSupportedCap(cap)
1073 }
1074 }
1075
1076 if uc := dc.upstream(); uc != nil && uc.supportsSASL("PLAIN") {
1077 dc.setSupportedCap("sasl", "PLAIN")
1078 } else if dc.network != nil {
1079 dc.unsetSupportedCap("sasl")
1080 }
1081
1082 if uc := dc.upstream(); uc != nil && uc.caps["draft/account-registration"] {
1083 // Strip "before-connect", because we require downstreams to be fully
1084 // connected before attempting account registration.
1085 values := strings.Split(uc.supportedCaps["draft/account-registration"], ",")
1086 for i, v := range values {
1087 if v == "before-connect" {
1088 values = append(values[:i], values[i+1:]...)
1089 break
1090 }
1091 }
1092 dc.setSupportedCap("draft/account-registration", strings.Join(values, ","))
1093 } else {
1094 dc.unsetSupportedCap("draft/account-registration")
1095 }
1096
1097 if _, ok := dc.user.msgStore.(chatHistoryMessageStore); ok && dc.network != nil {
1098 dc.setSupportedCap("draft/event-playback", "")
1099 } else {
1100 dc.unsetSupportedCap("draft/event-playback")
1101 }
1102}
1103
1104func (dc *downstreamConn) updateNick() {
1105 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
1106 dc.SendMessage(&irc.Message{
1107 Prefix: dc.prefix(),
1108 Command: "NICK",
1109 Params: []string{uc.nick},
1110 })
1111 dc.nick = uc.nick
1112 dc.nickCM = casemapASCII(dc.nick)
1113 }
1114}
1115
1116func (dc *downstreamConn) updateRealname() {
1117 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
1118 dc.SendMessage(&irc.Message{
1119 Prefix: dc.prefix(),
1120 Command: "SETNAME",
1121 Params: []string{uc.realname},
1122 })
1123 dc.realname = uc.realname
1124 }
1125}
1126
1127func (dc *downstreamConn) updateAccount() {
1128 var account string
1129 if dc.network == nil {
1130 account = dc.user.Username
1131 } else if uc := dc.upstream(); uc != nil {
1132 account = uc.account
1133 } else {
1134 return
1135 }
1136
1137 if dc.account == account || !dc.caps["sasl"] {
1138 return
1139 }
1140
1141 if account != "" {
1142 dc.SendMessage(&irc.Message{
1143 Prefix: dc.srv.prefix(),
1144 Command: irc.RPL_LOGGEDIN,
1145 Params: []string{dc.nick, dc.prefix().String(), account, "You are logged in as " + account},
1146 })
1147 } else {
1148 dc.SendMessage(&irc.Message{
1149 Prefix: dc.srv.prefix(),
1150 Command: irc.RPL_LOGGEDOUT,
1151 Params: []string{dc.nick, dc.prefix().String(), "You are logged out"},
1152 })
1153 }
1154
1155 dc.account = account
1156}
1157
1158func sanityCheckServer(ctx context.Context, addr string) error {
1159 ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
1160 defer cancel()
1161
1162 conn, err := new(tls.Dialer).DialContext(ctx, "tcp", addr)
1163 if err != nil {
1164 return err
1165 }
1166
1167 return conn.Close()
1168}
1169
1170func unmarshalUsername(rawUsername string) (username, client, network string) {
1171 username = rawUsername
1172
1173 i := strings.IndexAny(username, "/@")
1174 j := strings.LastIndexAny(username, "/@")
1175 if i >= 0 {
1176 username = rawUsername[:i]
1177 }
1178 if j >= 0 {
1179 if rawUsername[j] == '@' {
1180 client = rawUsername[j+1:]
1181 } else {
1182 network = rawUsername[j+1:]
1183 }
1184 }
1185 if i >= 0 && j >= 0 && i < j {
1186 if rawUsername[i] == '@' {
1187 client = rawUsername[i+1 : j]
1188 } else {
1189 network = rawUsername[i+1 : j]
1190 }
1191 }
1192
1193 return username, client, network
1194}
1195
1196func (dc *downstreamConn) authenticate(ctx context.Context, username, password string) error {
1197 username, clientName, networkName := unmarshalUsername(username)
1198
1199 u, err := dc.srv.db.GetUser(ctx, username)
1200 if err != nil {
1201 return newInvalidUsernameOrPasswordError(fmt.Errorf("user not found: %w", err))
1202 }
1203
1204 // Password auth disabled
1205 if u.Password == "" {
1206 return newInvalidUsernameOrPasswordError(fmt.Errorf("password auth disabled"))
1207 }
1208
1209 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
1210 if err != nil {
1211 return newInvalidUsernameOrPasswordError(fmt.Errorf("wrong password"))
1212 }
1213
1214 dc.user = dc.srv.getUser(username)
1215 if dc.user == nil {
1216 return fmt.Errorf("user not active")
1217 }
1218 dc.clientName = clientName
1219 dc.networkName = networkName
1220 return nil
1221}
1222
1223func (dc *downstreamConn) register(ctx context.Context) error {
1224 if dc.registered {
1225 return fmt.Errorf("tried to register twice")
1226 }
1227
1228 if dc.sasl != nil {
1229 dc.endSASL(&irc.Message{
1230 Prefix: dc.srv.prefix(),
1231 Command: irc.ERR_SASLABORTED,
1232 Params: []string{dc.nick, "SASL authentication aborted"},
1233 })
1234 }
1235
1236 password := dc.password
1237 dc.password = ""
1238 if dc.user == nil {
1239 if password == "" {
1240 if dc.caps["sasl"] {
1241 return ircError{&irc.Message{
1242 Command: "FAIL",
1243 Params: []string{"*", "ACCOUNT_REQUIRED", "Authentication required"},
1244 }}
1245 } else {
1246 return ircError{&irc.Message{
1247 Command: irc.ERR_PASSWDMISMATCH,
1248 Params: []string{dc.nick, "Authentication required"},
1249 }}
1250 }
1251 }
1252
1253 if err := dc.authenticate(ctx, dc.rawUsername, password); err != nil {
1254 dc.logger.Printf("PASS authentication error for user %q: %v", dc.rawUsername, err)
1255 return ircError{&irc.Message{
1256 Command: irc.ERR_PASSWDMISMATCH,
1257 Params: []string{dc.nick, authErrorReason(err)},
1258 }}
1259 }
1260 }
1261
1262 if dc.clientName == "" && dc.networkName == "" {
1263 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1264 }
1265
1266 dc.registered = true
1267 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1268 return nil
1269}
1270
1271func (dc *downstreamConn) loadNetwork(ctx context.Context) error {
1272 if dc.networkName == "" {
1273 return nil
1274 }
1275
1276 network := dc.user.getNetwork(dc.networkName)
1277 if network == nil {
1278 addr := dc.networkName
1279 if !strings.ContainsRune(addr, ':') {
1280 addr = addr + ":6697"
1281 }
1282
1283 dc.logger.Printf("trying to connect to new network %q", addr)
1284 if err := sanityCheckServer(ctx, addr); err != nil {
1285 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1286 return ircError{&irc.Message{
1287 Command: irc.ERR_PASSWDMISMATCH,
1288 Params: []string{dc.nick, fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1289 }}
1290 }
1291
1292 // Some clients only allow specifying the nickname (and use the
1293 // nickname as a username too). Strip the network name from the
1294 // nickname when auto-saving networks.
1295 nick, _, _ := unmarshalUsername(dc.nick)
1296
1297 dc.logger.Printf("auto-saving network %q", dc.networkName)
1298 var err error
1299 network, err = dc.user.createNetwork(ctx, &Network{
1300 Addr: dc.networkName,
1301 Nick: nick,
1302 Enabled: true,
1303 })
1304 if err != nil {
1305 return err
1306 }
1307 }
1308
1309 dc.network = network
1310 return nil
1311}
1312
1313func (dc *downstreamConn) welcome(ctx context.Context) error {
1314 if dc.user == nil || !dc.registered {
1315 panic("tried to welcome an unregistered connection")
1316 }
1317
1318 remoteAddr := dc.conn.RemoteAddr().String()
1319 dc.logger = &prefixLogger{dc.srv.Logger, fmt.Sprintf("user %q: downstream %q: ", dc.user.Username, remoteAddr)}
1320
1321 // TODO: doing this might take some time. We should do it in dc.register
1322 // instead, but we'll potentially be adding a new network and this must be
1323 // done in the user goroutine.
1324 if err := dc.loadNetwork(ctx); err != nil {
1325 return err
1326 }
1327
1328 if dc.network == nil && !dc.caps["soju.im/bouncer-networks"] && dc.srv.Config().MultiUpstream {
1329 dc.isMultiUpstream = true
1330 }
1331
1332 dc.updateSupportedCaps()
1333
1334 isupport := []string{
1335 fmt.Sprintf("CHATHISTORY=%v", chatHistoryLimit),
1336 "CASEMAPPING=ascii",
1337 }
1338
1339 if dc.network != nil {
1340 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1341 }
1342 if title := dc.srv.Config().Title; dc.network == nil && title != "" {
1343 isupport = append(isupport, "NETWORK="+encodeISUPPORT(title))
1344 }
1345 if dc.network == nil && !dc.isMultiUpstream {
1346 isupport = append(isupport, "WHOX")
1347 }
1348
1349 if uc := dc.upstream(); uc != nil {
1350 for k := range passthroughIsupport {
1351 v, ok := uc.isupport[k]
1352 if !ok {
1353 continue
1354 }
1355 if v != nil {
1356 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1357 } else {
1358 isupport = append(isupport, k)
1359 }
1360 }
1361 }
1362
1363 dc.SendMessage(&irc.Message{
1364 Prefix: dc.srv.prefix(),
1365 Command: irc.RPL_WELCOME,
1366 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1367 })
1368 dc.SendMessage(&irc.Message{
1369 Prefix: dc.srv.prefix(),
1370 Command: irc.RPL_YOURHOST,
1371 Params: []string{dc.nick, "Your host is " + dc.srv.Config().Hostname},
1372 })
1373 dc.SendMessage(&irc.Message{
1374 Prefix: dc.srv.prefix(),
1375 Command: irc.RPL_MYINFO,
1376 Params: []string{dc.nick, dc.srv.Config().Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1377 })
1378 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1379 dc.SendMessage(msg)
1380 }
1381 if uc := dc.upstream(); uc != nil {
1382 dc.SendMessage(&irc.Message{
1383 Prefix: dc.srv.prefix(),
1384 Command: irc.RPL_UMODEIS,
1385 Params: []string{dc.nick, "+" + string(uc.modes)},
1386 })
1387 }
1388 if dc.network == nil && !dc.isMultiUpstream && dc.user.Admin {
1389 dc.SendMessage(&irc.Message{
1390 Prefix: dc.srv.prefix(),
1391 Command: irc.RPL_UMODEIS,
1392 Params: []string{dc.nick, "+o"},
1393 })
1394 }
1395
1396 dc.updateNick()
1397 dc.updateRealname()
1398 dc.updateAccount()
1399
1400 if motd := dc.user.srv.Config().MOTD; motd != "" && dc.network == nil {
1401 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1402 dc.SendMessage(msg)
1403 }
1404 } else {
1405 motdHint := "No MOTD"
1406 if dc.network != nil {
1407 motdHint = "Use /motd to read the message of the day"
1408 }
1409 dc.SendMessage(&irc.Message{
1410 Prefix: dc.srv.prefix(),
1411 Command: irc.ERR_NOMOTD,
1412 Params: []string{dc.nick, motdHint},
1413 })
1414 }
1415
1416 if dc.caps["soju.im/bouncer-networks-notify"] {
1417 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1418 dc.user.forEachNetwork(func(network *network) {
1419 idStr := fmt.Sprintf("%v", network.ID)
1420 attrs := getNetworkAttrs(network)
1421 dc.SendMessage(&irc.Message{
1422 Tags: irc.Tags{"batch": batchRef},
1423 Prefix: dc.srv.prefix(),
1424 Command: "BOUNCER",
1425 Params: []string{"NETWORK", idStr, attrs.String()},
1426 })
1427 })
1428 })
1429 }
1430
1431 dc.forEachUpstream(func(uc *upstreamConn) {
1432 for _, entry := range uc.channels.innerMap {
1433 ch := entry.value.(*upstreamChannel)
1434 if !ch.complete {
1435 continue
1436 }
1437 record := uc.network.channels.Value(ch.Name)
1438 if record != nil && record.Detached {
1439 continue
1440 }
1441
1442 dc.SendMessage(&irc.Message{
1443 Prefix: dc.prefix(),
1444 Command: "JOIN",
1445 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1446 })
1447
1448 forwardChannel(dc, ch)
1449 }
1450 })
1451
1452 dc.forEachNetwork(func(net *network) {
1453 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1454 return
1455 }
1456
1457 // Only send history if we're the first connected client with that name
1458 // for the network
1459 firstClient := true
1460 dc.user.forEachDownstream(func(c *downstreamConn) {
1461 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1462 firstClient = false
1463 }
1464 })
1465 if firstClient {
1466 net.delivered.ForEachTarget(func(target string) {
1467 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1468 if lastDelivered == "" {
1469 return
1470 }
1471
1472 dc.sendTargetBacklog(ctx, net, target, lastDelivered)
1473
1474 // Fast-forward history to last message
1475 targetCM := net.casemap(target)
1476 lastID, err := dc.user.msgStore.LastMsgID(&net.Network, targetCM, time.Now())
1477 if err != nil {
1478 dc.logger.Printf("failed to get last message ID: %v", err)
1479 return
1480 }
1481 net.delivered.StoreID(target, dc.clientName, lastID)
1482 })
1483 }
1484 })
1485
1486 return nil
1487}
1488
1489// messageSupportsBacklog checks whether the provided message can be sent as
1490// part of an history batch.
1491func (dc *downstreamConn) messageSupportsBacklog(msg *irc.Message) bool {
1492 // Don't replay all messages, because that would mess up client
1493 // state. For instance we just sent the list of users, sending
1494 // PART messages for one of these users would be incorrect.
1495 switch msg.Command {
1496 case "PRIVMSG", "NOTICE":
1497 return true
1498 }
1499 return false
1500}
1501
1502func (dc *downstreamConn) sendTargetBacklog(ctx context.Context, net *network, target, msgID string) {
1503 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1504 return
1505 }
1506
1507 ch := net.channels.Value(target)
1508
1509 ctx, cancel := context.WithTimeout(ctx, backlogTimeout)
1510 defer cancel()
1511
1512 targetCM := net.casemap(target)
1513 history, err := dc.user.msgStore.LoadLatestID(ctx, &net.Network, targetCM, msgID, backlogLimit)
1514 if err != nil {
1515 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1516 return
1517 }
1518
1519 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1520 for _, msg := range history {
1521 if ch != nil && ch.Detached {
1522 if net.detachedMessageNeedsRelay(ch, msg) {
1523 dc.relayDetachedMessage(net, msg)
1524 }
1525 } else {
1526 msg.Tags["batch"] = batchRef
1527 dc.SendMessage(dc.marshalMessage(msg, net))
1528 }
1529 }
1530 })
1531}
1532
1533func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1534 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1535 return
1536 }
1537
1538 sender := msg.Prefix.Name
1539 target, text := msg.Params[0], msg.Params[1]
1540 if net.isHighlight(msg) {
1541 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1542 } else {
1543 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1544 }
1545}
1546
1547func (dc *downstreamConn) runUntilRegistered() error {
1548 ctx, cancel := context.WithTimeout(context.TODO(), downstreamRegisterTimeout)
1549 defer cancel()
1550
1551 // Close the connection with an error if the deadline is exceeded
1552 go func() {
1553 <-ctx.Done()
1554 if err := ctx.Err(); err == context.DeadlineExceeded {
1555 dc.SendMessage(&irc.Message{
1556 Prefix: dc.srv.prefix(),
1557 Command: "ERROR",
1558 Params: []string{"Connection registration timed out"},
1559 })
1560 dc.Close()
1561 }
1562 }()
1563
1564 for !dc.registered {
1565 msg, err := dc.ReadMessage()
1566 if err != nil {
1567 return fmt.Errorf("failed to read IRC command: %w", err)
1568 }
1569
1570 err = dc.handleMessage(ctx, msg)
1571 if ircErr, ok := err.(ircError); ok {
1572 ircErr.Message.Prefix = dc.srv.prefix()
1573 dc.SendMessage(ircErr.Message)
1574 } else if err != nil {
1575 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1576 }
1577 }
1578
1579 return nil
1580}
1581
1582func (dc *downstreamConn) handleMessageRegistered(ctx context.Context, msg *irc.Message) error {
1583 switch msg.Command {
1584 case "CAP":
1585 var subCmd string
1586 if err := parseMessageParams(msg, &subCmd); err != nil {
1587 return err
1588 }
1589 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1590 return err
1591 }
1592 case "PING":
1593 var source, destination string
1594 if err := parseMessageParams(msg, &source); err != nil {
1595 return err
1596 }
1597 if len(msg.Params) > 1 {
1598 destination = msg.Params[1]
1599 }
1600 hostname := dc.srv.Config().Hostname
1601 if destination != "" && destination != hostname {
1602 return ircError{&irc.Message{
1603 Command: irc.ERR_NOSUCHSERVER,
1604 Params: []string{dc.nick, destination, "No such server"},
1605 }}
1606 }
1607 dc.SendMessage(&irc.Message{
1608 Prefix: dc.srv.prefix(),
1609 Command: "PONG",
1610 Params: []string{hostname, source},
1611 })
1612 return nil
1613 case "PONG":
1614 if len(msg.Params) == 0 {
1615 return newNeedMoreParamsError(msg.Command)
1616 }
1617 token := msg.Params[len(msg.Params)-1]
1618 dc.handlePong(token)
1619 case "USER":
1620 return ircError{&irc.Message{
1621 Command: irc.ERR_ALREADYREGISTERED,
1622 Params: []string{dc.nick, "You may not reregister"},
1623 }}
1624 case "NICK":
1625 var rawNick string
1626 if err := parseMessageParams(msg, &rawNick); err != nil {
1627 return err
1628 }
1629
1630 nick := rawNick
1631 var upstream *upstreamConn
1632 if dc.upstream() == nil {
1633 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1634 if err == nil { // NICK nick/network: NICK only on a specific upstream
1635 upstream = uc
1636 nick = unmarshaledNick
1637 }
1638 }
1639
1640 if nick == "" || strings.ContainsAny(nick, illegalNickChars) {
1641 return ircError{&irc.Message{
1642 Command: irc.ERR_ERRONEUSNICKNAME,
1643 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1644 }}
1645 }
1646 if casemapASCII(nick) == serviceNickCM {
1647 return ircError{&irc.Message{
1648 Command: irc.ERR_NICKNAMEINUSE,
1649 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1650 }}
1651 }
1652
1653 var err error
1654 dc.forEachNetwork(func(n *network) {
1655 if err != nil || (upstream != nil && upstream.network != n) {
1656 return
1657 }
1658 n.Nick = nick
1659 err = dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network)
1660 })
1661 if err != nil {
1662 return err
1663 }
1664
1665 dc.forEachUpstream(func(uc *upstreamConn) {
1666 if upstream != nil && upstream != uc {
1667 return
1668 }
1669 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1670 Command: "NICK",
1671 Params: []string{nick},
1672 })
1673 })
1674
1675 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1676 dc.SendMessage(&irc.Message{
1677 Prefix: dc.prefix(),
1678 Command: "NICK",
1679 Params: []string{nick},
1680 })
1681 dc.nick = nick
1682 dc.nickCM = casemapASCII(dc.nick)
1683 }
1684 case "SETNAME":
1685 var realname string
1686 if err := parseMessageParams(msg, &realname); err != nil {
1687 return err
1688 }
1689
1690 // If the client just resets to the default, just wipe the per-network
1691 // preference
1692 storeRealname := realname
1693 if realname == dc.user.Realname {
1694 storeRealname = ""
1695 }
1696
1697 var storeErr error
1698 var needUpdate []Network
1699 dc.forEachNetwork(func(n *network) {
1700 // We only need to call updateNetwork for upstreams that don't
1701 // support setname
1702 if uc := n.conn; uc != nil && uc.caps["setname"] {
1703 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1704 Command: "SETNAME",
1705 Params: []string{realname},
1706 })
1707
1708 n.Realname = storeRealname
1709 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
1710 dc.logger.Printf("failed to store network realname: %v", err)
1711 storeErr = err
1712 }
1713 return
1714 }
1715
1716 record := n.Network // copy network record because we'll mutate it
1717 record.Realname = storeRealname
1718 needUpdate = append(needUpdate, record)
1719 })
1720
1721 // Walk the network list as a second step, because updateNetwork
1722 // mutates the original list
1723 for _, record := range needUpdate {
1724 if _, err := dc.user.updateNetwork(ctx, &record); err != nil {
1725 dc.logger.Printf("failed to update network realname: %v", err)
1726 storeErr = err
1727 }
1728 }
1729 if storeErr != nil {
1730 return ircError{&irc.Message{
1731 Command: "FAIL",
1732 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1733 }}
1734 }
1735
1736 if dc.upstream() == nil {
1737 dc.SendMessage(&irc.Message{
1738 Prefix: dc.prefix(),
1739 Command: "SETNAME",
1740 Params: []string{realname},
1741 })
1742 }
1743 case "JOIN":
1744 var namesStr string
1745 if err := parseMessageParams(msg, &namesStr); err != nil {
1746 return err
1747 }
1748
1749 var keys []string
1750 if len(msg.Params) > 1 {
1751 keys = strings.Split(msg.Params[1], ",")
1752 }
1753
1754 for i, name := range strings.Split(namesStr, ",") {
1755 uc, upstreamName, err := dc.unmarshalEntity(name)
1756 if err != nil {
1757 return err
1758 }
1759
1760 var key string
1761 if len(keys) > i {
1762 key = keys[i]
1763 }
1764
1765 if !uc.isChannel(upstreamName) {
1766 dc.SendMessage(&irc.Message{
1767 Prefix: dc.srv.prefix(),
1768 Command: irc.ERR_NOSUCHCHANNEL,
1769 Params: []string{name, "Not a channel name"},
1770 })
1771 continue
1772 }
1773
1774 // Most servers ignore duplicate JOIN messages. We ignore them here
1775 // because some clients automatically send JOIN messages in bulk
1776 // when reconnecting to the bouncer. We don't want to flood the
1777 // upstream connection with these.
1778 if !uc.channels.Has(upstreamName) {
1779 params := []string{upstreamName}
1780 if key != "" {
1781 params = append(params, key)
1782 }
1783 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1784 Command: "JOIN",
1785 Params: params,
1786 })
1787 }
1788
1789 ch := uc.network.channels.Value(upstreamName)
1790 if ch != nil {
1791 // Don't clear the channel key if there's one set
1792 // TODO: add a way to unset the channel key
1793 if key != "" {
1794 ch.Key = key
1795 }
1796 uc.network.attach(ch)
1797 } else {
1798 ch = &Channel{
1799 Name: upstreamName,
1800 Key: key,
1801 }
1802 uc.network.channels.SetValue(upstreamName, ch)
1803 }
1804 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1805 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1806 }
1807 }
1808 case "PART":
1809 var namesStr string
1810 if err := parseMessageParams(msg, &namesStr); err != nil {
1811 return err
1812 }
1813
1814 var reason string
1815 if len(msg.Params) > 1 {
1816 reason = msg.Params[1]
1817 }
1818
1819 for _, name := range strings.Split(namesStr, ",") {
1820 uc, upstreamName, err := dc.unmarshalEntity(name)
1821 if err != nil {
1822 return err
1823 }
1824
1825 if strings.EqualFold(reason, "detach") {
1826 ch := uc.network.channels.Value(upstreamName)
1827 if ch != nil {
1828 uc.network.detach(ch)
1829 } else {
1830 ch = &Channel{
1831 Name: name,
1832 Detached: true,
1833 }
1834 uc.network.channels.SetValue(upstreamName, ch)
1835 }
1836 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1837 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1838 }
1839 } else {
1840 params := []string{upstreamName}
1841 if reason != "" {
1842 params = append(params, reason)
1843 }
1844 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1845 Command: "PART",
1846 Params: params,
1847 })
1848
1849 if err := uc.network.deleteChannel(ctx, upstreamName); err != nil {
1850 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1851 }
1852 }
1853 }
1854 case "KICK":
1855 var channelStr, userStr string
1856 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1857 return err
1858 }
1859
1860 channels := strings.Split(channelStr, ",")
1861 users := strings.Split(userStr, ",")
1862
1863 var reason string
1864 if len(msg.Params) > 2 {
1865 reason = msg.Params[2]
1866 }
1867
1868 if len(channels) != 1 && len(channels) != len(users) {
1869 return ircError{&irc.Message{
1870 Command: irc.ERR_BADCHANMASK,
1871 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1872 }}
1873 }
1874
1875 for i, user := range users {
1876 var channel string
1877 if len(channels) == 1 {
1878 channel = channels[0]
1879 } else {
1880 channel = channels[i]
1881 }
1882
1883 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1884 if err != nil {
1885 return err
1886 }
1887
1888 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1889 if err != nil {
1890 return err
1891 }
1892
1893 if ucChannel != ucUser {
1894 return ircError{&irc.Message{
1895 Command: irc.ERR_USERNOTINCHANNEL,
1896 Params: []string{dc.nick, user, channel, "They are on another network"},
1897 }}
1898 }
1899 uc := ucChannel
1900
1901 params := []string{upstreamChannel, upstreamUser}
1902 if reason != "" {
1903 params = append(params, reason)
1904 }
1905 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1906 Command: "KICK",
1907 Params: params,
1908 })
1909 }
1910 case "MODE":
1911 var name string
1912 if err := parseMessageParams(msg, &name); err != nil {
1913 return err
1914 }
1915
1916 var modeStr string
1917 if len(msg.Params) > 1 {
1918 modeStr = msg.Params[1]
1919 }
1920
1921 if casemapASCII(name) == dc.nickCM {
1922 if modeStr != "" {
1923 if uc := dc.upstream(); uc != nil {
1924 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1925 Command: "MODE",
1926 Params: []string{uc.nick, modeStr},
1927 })
1928 } else {
1929 dc.SendMessage(&irc.Message{
1930 Prefix: dc.srv.prefix(),
1931 Command: irc.ERR_UMODEUNKNOWNFLAG,
1932 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1933 })
1934 }
1935 } else {
1936 var userMode string
1937 if uc := dc.upstream(); uc != nil {
1938 userMode = string(uc.modes)
1939 }
1940
1941 dc.SendMessage(&irc.Message{
1942 Prefix: dc.srv.prefix(),
1943 Command: irc.RPL_UMODEIS,
1944 Params: []string{dc.nick, "+" + userMode},
1945 })
1946 }
1947 return nil
1948 }
1949
1950 uc, upstreamName, err := dc.unmarshalEntity(name)
1951 if err != nil {
1952 return err
1953 }
1954
1955 if !uc.isChannel(upstreamName) {
1956 return ircError{&irc.Message{
1957 Command: irc.ERR_USERSDONTMATCH,
1958 Params: []string{dc.nick, "Cannot change mode for other users"},
1959 }}
1960 }
1961
1962 if modeStr != "" {
1963 params := []string{upstreamName, modeStr}
1964 params = append(params, msg.Params[2:]...)
1965 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
1966 Command: "MODE",
1967 Params: params,
1968 })
1969 } else {
1970 ch := uc.channels.Value(upstreamName)
1971 if ch == nil {
1972 return ircError{&irc.Message{
1973 Command: irc.ERR_NOSUCHCHANNEL,
1974 Params: []string{dc.nick, name, "No such channel"},
1975 }}
1976 }
1977
1978 if ch.modes == nil {
1979 // we haven't received the initial RPL_CHANNELMODEIS yet
1980 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1981 return nil
1982 }
1983
1984 modeStr, modeParams := ch.modes.Format()
1985 params := []string{dc.nick, name, modeStr}
1986 params = append(params, modeParams...)
1987
1988 dc.SendMessage(&irc.Message{
1989 Prefix: dc.srv.prefix(),
1990 Command: irc.RPL_CHANNELMODEIS,
1991 Params: params,
1992 })
1993 if ch.creationTime != "" {
1994 dc.SendMessage(&irc.Message{
1995 Prefix: dc.srv.prefix(),
1996 Command: rpl_creationtime,
1997 Params: []string{dc.nick, name, ch.creationTime},
1998 })
1999 }
2000 }
2001 case "TOPIC":
2002 var channel string
2003 if err := parseMessageParams(msg, &channel); err != nil {
2004 return err
2005 }
2006
2007 uc, upstreamName, err := dc.unmarshalEntity(channel)
2008 if err != nil {
2009 return err
2010 }
2011
2012 if len(msg.Params) > 1 { // setting topic
2013 topic := msg.Params[1]
2014 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2015 Command: "TOPIC",
2016 Params: []string{upstreamName, topic},
2017 })
2018 } else { // getting topic
2019 ch := uc.channels.Value(upstreamName)
2020 if ch == nil {
2021 return ircError{&irc.Message{
2022 Command: irc.ERR_NOSUCHCHANNEL,
2023 Params: []string{dc.nick, upstreamName, "No such channel"},
2024 }}
2025 }
2026 sendTopic(dc, ch)
2027 }
2028 case "LIST":
2029 network := dc.network
2030 if network == nil && len(msg.Params) > 0 {
2031 var err error
2032 network, msg.Params[0], err = dc.unmarshalEntityNetwork(msg.Params[0])
2033 if err != nil {
2034 return err
2035 }
2036 }
2037 if network == nil {
2038 dc.SendMessage(&irc.Message{
2039 Prefix: dc.srv.prefix(),
2040 Command: irc.RPL_LISTEND,
2041 Params: []string{dc.nick, "LIST without a network suffix is not supported in multi-upstream mode"},
2042 })
2043 return nil
2044 }
2045
2046 uc := network.conn
2047 if uc == nil {
2048 dc.SendMessage(&irc.Message{
2049 Prefix: dc.srv.prefix(),
2050 Command: irc.RPL_LISTEND,
2051 Params: []string{dc.nick, "Disconnected from upstream server"},
2052 })
2053 return nil
2054 }
2055
2056 uc.enqueueCommand(dc, msg)
2057 case "NAMES":
2058 if len(msg.Params) == 0 {
2059 dc.SendMessage(&irc.Message{
2060 Prefix: dc.srv.prefix(),
2061 Command: irc.RPL_ENDOFNAMES,
2062 Params: []string{dc.nick, "*", "End of /NAMES list"},
2063 })
2064 return nil
2065 }
2066
2067 channels := strings.Split(msg.Params[0], ",")
2068 for _, channel := range channels {
2069 uc, upstreamName, err := dc.unmarshalEntity(channel)
2070 if err != nil {
2071 return err
2072 }
2073
2074 ch := uc.channels.Value(upstreamName)
2075 if ch != nil {
2076 sendNames(dc, ch)
2077 } else {
2078 // NAMES on a channel we have not joined, ask upstream
2079 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2080 Command: "NAMES",
2081 Params: []string{upstreamName},
2082 })
2083 }
2084 }
2085 // For WHOX docs, see:
2086 // - http://faerion.sourceforge.net/doc/irc/whox.var
2087 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
2088 // Note, many features aren't widely implemented, such as flags and mask2
2089 case "WHO":
2090 if len(msg.Params) == 0 {
2091 // TODO: support WHO without parameters
2092 dc.SendMessage(&irc.Message{
2093 Prefix: dc.srv.prefix(),
2094 Command: irc.RPL_ENDOFWHO,
2095 Params: []string{dc.nick, "*", "End of /WHO list"},
2096 })
2097 return nil
2098 }
2099
2100 // Clients will use the first mask to match RPL_ENDOFWHO
2101 endOfWhoToken := msg.Params[0]
2102
2103 // TODO: add support for WHOX mask2
2104 mask := msg.Params[0]
2105 var options string
2106 if len(msg.Params) > 1 {
2107 options = msg.Params[1]
2108 }
2109
2110 optionsParts := strings.SplitN(options, "%", 2)
2111 // TODO: add support for WHOX flags in optionsParts[0]
2112 var fields, whoxToken string
2113 if len(optionsParts) == 2 {
2114 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
2115 fields = strings.ToLower(optionsParts[0])
2116 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
2117 whoxToken = optionsParts[1]
2118 }
2119 }
2120
2121 // TODO: support mixed bouncer/upstream WHO queries
2122 maskCM := casemapASCII(mask)
2123 if dc.network == nil && maskCM == dc.nickCM {
2124 // TODO: support AWAY (H/G) in self WHO reply
2125 flags := "H"
2126 if dc.user.Admin {
2127 flags += "*"
2128 }
2129 info := whoxInfo{
2130 Token: whoxToken,
2131 Username: dc.user.Username,
2132 Hostname: dc.hostname,
2133 Server: dc.srv.Config().Hostname,
2134 Nickname: dc.nick,
2135 Flags: flags,
2136 Account: dc.user.Username,
2137 Realname: dc.realname,
2138 }
2139 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
2140 dc.SendMessage(&irc.Message{
2141 Prefix: dc.srv.prefix(),
2142 Command: irc.RPL_ENDOFWHO,
2143 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
2144 })
2145 return nil
2146 }
2147 if maskCM == serviceNickCM {
2148 info := whoxInfo{
2149 Token: whoxToken,
2150 Username: servicePrefix.User,
2151 Hostname: servicePrefix.Host,
2152 Server: dc.srv.Config().Hostname,
2153 Nickname: serviceNick,
2154 Flags: "H*",
2155 Account: serviceNick,
2156 Realname: serviceRealname,
2157 }
2158 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
2159 dc.SendMessage(&irc.Message{
2160 Prefix: dc.srv.prefix(),
2161 Command: irc.RPL_ENDOFWHO,
2162 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
2163 })
2164 return nil
2165 }
2166
2167 // TODO: properly support WHO masks
2168 uc, upstreamMask, err := dc.unmarshalEntity(mask)
2169 if err != nil {
2170 return err
2171 }
2172
2173 params := []string{upstreamMask}
2174 if options != "" {
2175 params = append(params, options)
2176 }
2177
2178 uc.enqueueCommand(dc, &irc.Message{
2179 Command: "WHO",
2180 Params: params,
2181 })
2182 case "WHOIS":
2183 if len(msg.Params) == 0 {
2184 return ircError{&irc.Message{
2185 Command: irc.ERR_NONICKNAMEGIVEN,
2186 Params: []string{dc.nick, "No nickname given"},
2187 }}
2188 }
2189
2190 var target, mask string
2191 if len(msg.Params) == 1 {
2192 target = ""
2193 mask = msg.Params[0]
2194 } else {
2195 target = msg.Params[0]
2196 mask = msg.Params[1]
2197 }
2198 // TODO: support multiple WHOIS users
2199 if i := strings.IndexByte(mask, ','); i >= 0 {
2200 mask = mask[:i]
2201 }
2202
2203 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2204 dc.SendMessage(&irc.Message{
2205 Prefix: dc.srv.prefix(),
2206 Command: irc.RPL_WHOISUSER,
2207 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2208 })
2209 dc.SendMessage(&irc.Message{
2210 Prefix: dc.srv.prefix(),
2211 Command: irc.RPL_WHOISSERVER,
2212 Params: []string{dc.nick, dc.nick, dc.srv.Config().Hostname, "soju"},
2213 })
2214 if dc.user.Admin {
2215 dc.SendMessage(&irc.Message{
2216 Prefix: dc.srv.prefix(),
2217 Command: irc.RPL_WHOISOPERATOR,
2218 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2219 })
2220 }
2221 dc.SendMessage(&irc.Message{
2222 Prefix: dc.srv.prefix(),
2223 Command: rpl_whoisaccount,
2224 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2225 })
2226 dc.SendMessage(&irc.Message{
2227 Prefix: dc.srv.prefix(),
2228 Command: irc.RPL_ENDOFWHOIS,
2229 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2230 })
2231 return nil
2232 }
2233 if casemapASCII(mask) == serviceNickCM {
2234 dc.SendMessage(&irc.Message{
2235 Prefix: dc.srv.prefix(),
2236 Command: irc.RPL_WHOISUSER,
2237 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2238 })
2239 dc.SendMessage(&irc.Message{
2240 Prefix: dc.srv.prefix(),
2241 Command: irc.RPL_WHOISSERVER,
2242 Params: []string{dc.nick, serviceNick, dc.srv.Config().Hostname, "soju"},
2243 })
2244 dc.SendMessage(&irc.Message{
2245 Prefix: dc.srv.prefix(),
2246 Command: irc.RPL_WHOISOPERATOR,
2247 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2248 })
2249 dc.SendMessage(&irc.Message{
2250 Prefix: dc.srv.prefix(),
2251 Command: rpl_whoisaccount,
2252 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2253 })
2254 dc.SendMessage(&irc.Message{
2255 Prefix: dc.srv.prefix(),
2256 Command: irc.RPL_ENDOFWHOIS,
2257 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2258 })
2259 return nil
2260 }
2261
2262 // TODO: support WHOIS masks
2263 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2264 if err != nil {
2265 return err
2266 }
2267
2268 var params []string
2269 if target != "" {
2270 if target == mask { // WHOIS nick nick
2271 params = []string{upstreamNick, upstreamNick}
2272 } else {
2273 params = []string{target, upstreamNick}
2274 }
2275 } else {
2276 params = []string{upstreamNick}
2277 }
2278
2279 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2280 Command: "WHOIS",
2281 Params: params,
2282 })
2283 case "PRIVMSG", "NOTICE":
2284 var targetsStr, text string
2285 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2286 return err
2287 }
2288 tags := copyClientTags(msg.Tags)
2289
2290 for _, name := range strings.Split(targetsStr, ",") {
2291 if name == "$"+dc.srv.Config().Hostname || (name == "$*" && dc.network == nil) {
2292 // "$" means a server mask follows. If it's the bouncer's
2293 // hostname, broadcast the message to all bouncer users.
2294 if !dc.user.Admin {
2295 return ircError{&irc.Message{
2296 Prefix: dc.srv.prefix(),
2297 Command: irc.ERR_BADMASK,
2298 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2299 }}
2300 }
2301
2302 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2303
2304 broadcastTags := tags.Copy()
2305 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2306 broadcastMsg := &irc.Message{
2307 Tags: broadcastTags,
2308 Prefix: servicePrefix,
2309 Command: msg.Command,
2310 Params: []string{name, text},
2311 }
2312 dc.srv.forEachUser(func(u *user) {
2313 u.events <- eventBroadcast{broadcastMsg}
2314 })
2315 continue
2316 }
2317
2318 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2319 dc.SendMessage(&irc.Message{
2320 Tags: msg.Tags.Copy(),
2321 Prefix: dc.prefix(),
2322 Command: msg.Command,
2323 Params: []string{name, text},
2324 })
2325 continue
2326 }
2327
2328 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2329 if dc.caps["echo-message"] {
2330 echoTags := tags.Copy()
2331 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2332 dc.SendMessage(&irc.Message{
2333 Tags: echoTags,
2334 Prefix: dc.prefix(),
2335 Command: msg.Command,
2336 Params: []string{name, text},
2337 })
2338 }
2339 handleServicePRIVMSG(ctx, dc, text)
2340 continue
2341 }
2342
2343 uc, upstreamName, err := dc.unmarshalEntity(name)
2344 if err != nil {
2345 return err
2346 }
2347
2348 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2349 dc.handleNickServPRIVMSG(ctx, uc, text)
2350 }
2351
2352 unmarshaledText := text
2353 if uc.isChannel(upstreamName) {
2354 unmarshaledText = dc.unmarshalText(uc, text)
2355 }
2356 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2357 Tags: tags,
2358 Command: msg.Command,
2359 Params: []string{upstreamName, unmarshaledText},
2360 })
2361
2362 echoTags := tags.Copy()
2363 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2364 if uc.account != "" {
2365 echoTags["account"] = irc.TagValue(uc.account)
2366 }
2367 echoMsg := &irc.Message{
2368 Tags: echoTags,
2369 Prefix: &irc.Prefix{Name: uc.nick},
2370 Command: msg.Command,
2371 Params: []string{upstreamName, text},
2372 }
2373 uc.produce(upstreamName, echoMsg, dc)
2374
2375 uc.updateChannelAutoDetach(upstreamName)
2376 }
2377 case "TAGMSG":
2378 var targetsStr string
2379 if err := parseMessageParams(msg, &targetsStr); err != nil {
2380 return err
2381 }
2382 tags := copyClientTags(msg.Tags)
2383
2384 for _, name := range strings.Split(targetsStr, ",") {
2385 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2386 dc.SendMessage(&irc.Message{
2387 Tags: msg.Tags.Copy(),
2388 Prefix: dc.prefix(),
2389 Command: "TAGMSG",
2390 Params: []string{name},
2391 })
2392 continue
2393 }
2394
2395 if casemapASCII(name) == serviceNickCM {
2396 continue
2397 }
2398
2399 uc, upstreamName, err := dc.unmarshalEntity(name)
2400 if err != nil {
2401 return err
2402 }
2403 if _, ok := uc.caps["message-tags"]; !ok {
2404 continue
2405 }
2406
2407 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2408 Tags: tags,
2409 Command: "TAGMSG",
2410 Params: []string{upstreamName},
2411 })
2412
2413 uc.updateChannelAutoDetach(upstreamName)
2414 }
2415 case "INVITE":
2416 var user, channel string
2417 if err := parseMessageParams(msg, &user, &channel); err != nil {
2418 return err
2419 }
2420
2421 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2422 if err != nil {
2423 return err
2424 }
2425
2426 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2427 if err != nil {
2428 return err
2429 }
2430
2431 if ucChannel != ucUser {
2432 return ircError{&irc.Message{
2433 Command: irc.ERR_USERNOTINCHANNEL,
2434 Params: []string{dc.nick, user, channel, "They are on another network"},
2435 }}
2436 }
2437 uc := ucChannel
2438
2439 uc.SendMessageLabeled(ctx, dc.id, &irc.Message{
2440 Command: "INVITE",
2441 Params: []string{upstreamUser, upstreamChannel},
2442 })
2443 case "AUTHENTICATE":
2444 // Post-connection-registration AUTHENTICATE is unsupported in
2445 // multi-upstream mode, or if the upstream doesn't support SASL
2446 uc := dc.upstream()
2447 if uc == nil || !uc.caps["sasl"] {
2448 return ircError{&irc.Message{
2449 Command: irc.ERR_SASLFAIL,
2450 Params: []string{dc.nick, "Upstream network authentication not supported"},
2451 }}
2452 }
2453
2454 credentials, err := dc.handleAuthenticateCommand(msg)
2455 if err != nil {
2456 return err
2457 }
2458
2459 if credentials != nil {
2460 if uc.saslClient != nil {
2461 dc.endSASL(&irc.Message{
2462 Prefix: dc.srv.prefix(),
2463 Command: irc.ERR_SASLFAIL,
2464 Params: []string{dc.nick, "Another authentication attempt is already in progress"},
2465 })
2466 return nil
2467 }
2468
2469 uc.logger.Printf("starting post-registration SASL PLAIN authentication with username %q", credentials.plainUsername)
2470 uc.saslClient = sasl.NewPlainClient("", credentials.plainUsername, credentials.plainPassword)
2471 uc.enqueueCommand(dc, &irc.Message{
2472 Command: "AUTHENTICATE",
2473 Params: []string{"PLAIN"},
2474 })
2475 }
2476 case "REGISTER", "VERIFY":
2477 // Check number of params here, since we'll use that to save the
2478 // credentials on command success
2479 if (msg.Command == "REGISTER" && len(msg.Params) < 3) || (msg.Command == "VERIFY" && len(msg.Params) < 2) {
2480 return newNeedMoreParamsError(msg.Command)
2481 }
2482
2483 uc := dc.upstream()
2484 if uc == nil || !uc.caps["draft/account-registration"] {
2485 return ircError{&irc.Message{
2486 Command: "FAIL",
2487 Params: []string{msg.Command, "TEMPORARILY_UNAVAILABLE", "*", "Upstream network account registration not supported"},
2488 }}
2489 }
2490
2491 uc.logger.Printf("starting %v with account name %v", msg.Command, msg.Params[0])
2492 uc.enqueueCommand(dc, msg)
2493 case "MONITOR":
2494 // MONITOR is unsupported in multi-upstream mode
2495 uc := dc.upstream()
2496 if uc == nil {
2497 return newUnknownCommandError(msg.Command)
2498 }
2499 if _, ok := uc.isupport["MONITOR"]; !ok {
2500 return newUnknownCommandError(msg.Command)
2501 }
2502
2503 var subcommand string
2504 if err := parseMessageParams(msg, &subcommand); err != nil {
2505 return err
2506 }
2507
2508 switch strings.ToUpper(subcommand) {
2509 case "+", "-":
2510 var targets string
2511 if err := parseMessageParams(msg, nil, &targets); err != nil {
2512 return err
2513 }
2514 for _, target := range strings.Split(targets, ",") {
2515 if subcommand == "+" {
2516 // Hard limit, just to avoid having downstreams fill our map
2517 if len(dc.monitored.innerMap) >= 1000 {
2518 dc.SendMessage(&irc.Message{
2519 Prefix: dc.srv.prefix(),
2520 Command: irc.ERR_MONLISTFULL,
2521 Params: []string{dc.nick, "1000", target, "Bouncer monitor list is full"},
2522 })
2523 continue
2524 }
2525
2526 dc.monitored.SetValue(target, nil)
2527
2528 if uc.monitored.Has(target) {
2529 cmd := irc.RPL_MONOFFLINE
2530 if online := uc.monitored.Value(target); online {
2531 cmd = irc.RPL_MONONLINE
2532 }
2533
2534 dc.SendMessage(&irc.Message{
2535 Prefix: dc.srv.prefix(),
2536 Command: cmd,
2537 Params: []string{dc.nick, target},
2538 })
2539 }
2540 } else {
2541 dc.monitored.Delete(target)
2542 }
2543 }
2544 uc.updateMonitor()
2545 case "C": // clear
2546 dc.monitored = newCasemapMap(0)
2547 uc.updateMonitor()
2548 case "L": // list
2549 // TODO: be less lazy and pack the list
2550 for _, entry := range dc.monitored.innerMap {
2551 dc.SendMessage(&irc.Message{
2552 Prefix: dc.srv.prefix(),
2553 Command: irc.RPL_MONLIST,
2554 Params: []string{dc.nick, entry.originalKey},
2555 })
2556 }
2557 dc.SendMessage(&irc.Message{
2558 Prefix: dc.srv.prefix(),
2559 Command: irc.RPL_ENDOFMONLIST,
2560 Params: []string{dc.nick, "End of MONITOR list"},
2561 })
2562 case "S": // status
2563 // TODO: be less lazy and pack the lists
2564 for _, entry := range dc.monitored.innerMap {
2565 target := entry.originalKey
2566
2567 cmd := irc.RPL_MONOFFLINE
2568 if online := uc.monitored.Value(target); online {
2569 cmd = irc.RPL_MONONLINE
2570 }
2571
2572 dc.SendMessage(&irc.Message{
2573 Prefix: dc.srv.prefix(),
2574 Command: cmd,
2575 Params: []string{dc.nick, target},
2576 })
2577 }
2578 }
2579 case "CHATHISTORY":
2580 var subcommand string
2581 if err := parseMessageParams(msg, &subcommand); err != nil {
2582 return err
2583 }
2584 var target, limitStr string
2585 var boundsStr [2]string
2586 switch subcommand {
2587 case "AFTER", "BEFORE", "LATEST":
2588 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2589 return err
2590 }
2591 case "BETWEEN":
2592 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2593 return err
2594 }
2595 case "TARGETS":
2596 if dc.network == nil {
2597 // Either an unbound bouncer network, in which case we should return no targets,
2598 // or a multi-upstream downstream, but we don't support CHATHISTORY TARGETS for those yet.
2599 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {})
2600 return nil
2601 }
2602 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2603 return err
2604 }
2605 default:
2606 // TODO: support AROUND
2607 return ircError{&irc.Message{
2608 Command: "FAIL",
2609 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2610 }}
2611 }
2612
2613 // We don't save history for our service
2614 if casemapASCII(target) == serviceNickCM {
2615 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2616 return nil
2617 }
2618
2619 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2620 if !ok {
2621 return ircError{&irc.Message{
2622 Command: irc.ERR_UNKNOWNCOMMAND,
2623 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2624 }}
2625 }
2626
2627 network, entity, err := dc.unmarshalEntityNetwork(target)
2628 if err != nil {
2629 return err
2630 }
2631 entity = network.casemap(entity)
2632
2633 // TODO: support msgid criteria
2634 var bounds [2]time.Time
2635 bounds[0] = parseChatHistoryBound(boundsStr[0])
2636 if subcommand == "LATEST" && boundsStr[0] == "*" {
2637 bounds[0] = time.Now()
2638 } else if bounds[0].IsZero() {
2639 return ircError{&irc.Message{
2640 Command: "FAIL",
2641 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2642 }}
2643 }
2644
2645 if boundsStr[1] != "" {
2646 bounds[1] = parseChatHistoryBound(boundsStr[1])
2647 if bounds[1].IsZero() {
2648 return ircError{&irc.Message{
2649 Command: "FAIL",
2650 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2651 }}
2652 }
2653 }
2654
2655 limit, err := strconv.Atoi(limitStr)
2656 if err != nil || limit < 0 || limit > chatHistoryLimit {
2657 return ircError{&irc.Message{
2658 Command: "FAIL",
2659 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2660 }}
2661 }
2662
2663 eventPlayback := dc.caps["draft/event-playback"]
2664
2665 var history []*irc.Message
2666 switch subcommand {
2667 case "BEFORE", "LATEST":
2668 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], time.Time{}, limit, eventPlayback)
2669 case "AFTER":
2670 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], time.Now(), limit, eventPlayback)
2671 case "BETWEEN":
2672 if bounds[0].Before(bounds[1]) {
2673 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2674 } else {
2675 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2676 }
2677 case "TARGETS":
2678 // TODO: support TARGETS in multi-upstream mode
2679 targets, err := store.ListTargets(ctx, &network.Network, bounds[0], bounds[1], limit, eventPlayback)
2680 if err != nil {
2681 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2682 return ircError{&irc.Message{
2683 Command: "FAIL",
2684 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2685 }}
2686 }
2687
2688 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2689 for _, target := range targets {
2690 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2691 continue
2692 }
2693
2694 dc.SendMessage(&irc.Message{
2695 Tags: irc.Tags{"batch": batchRef},
2696 Prefix: dc.srv.prefix(),
2697 Command: "CHATHISTORY",
2698 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2699 })
2700 }
2701 })
2702
2703 return nil
2704 }
2705 if err != nil {
2706 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2707 return newChatHistoryError(subcommand, target)
2708 }
2709
2710 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2711 for _, msg := range history {
2712 msg.Tags["batch"] = batchRef
2713 dc.SendMessage(dc.marshalMessage(msg, network))
2714 }
2715 })
2716 case "BOUNCER":
2717 var subcommand string
2718 if err := parseMessageParams(msg, &subcommand); err != nil {
2719 return err
2720 }
2721
2722 switch strings.ToUpper(subcommand) {
2723 case "BIND":
2724 return ircError{&irc.Message{
2725 Command: "FAIL",
2726 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2727 }}
2728 case "LISTNETWORKS":
2729 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2730 dc.user.forEachNetwork(func(network *network) {
2731 idStr := fmt.Sprintf("%v", network.ID)
2732 attrs := getNetworkAttrs(network)
2733 dc.SendMessage(&irc.Message{
2734 Tags: irc.Tags{"batch": batchRef},
2735 Prefix: dc.srv.prefix(),
2736 Command: "BOUNCER",
2737 Params: []string{"NETWORK", idStr, attrs.String()},
2738 })
2739 })
2740 })
2741 case "ADDNETWORK":
2742 var attrsStr string
2743 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2744 return err
2745 }
2746 attrs := irc.ParseTags(attrsStr)
2747
2748 record := &Network{Nick: dc.nick, Enabled: true}
2749 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2750 return err
2751 }
2752
2753 if record.Nick == dc.user.Username {
2754 record.Nick = ""
2755 }
2756 if record.Realname == dc.user.Realname {
2757 record.Realname = ""
2758 }
2759
2760 network, err := dc.user.createNetwork(ctx, record)
2761 if err != nil {
2762 return ircError{&irc.Message{
2763 Command: "FAIL",
2764 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2765 }}
2766 }
2767
2768 dc.SendMessage(&irc.Message{
2769 Prefix: dc.srv.prefix(),
2770 Command: "BOUNCER",
2771 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2772 })
2773 case "CHANGENETWORK":
2774 var idStr, attrsStr string
2775 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2776 return err
2777 }
2778 id, err := parseBouncerNetID(subcommand, idStr)
2779 if err != nil {
2780 return err
2781 }
2782 attrs := irc.ParseTags(attrsStr)
2783
2784 net := dc.user.getNetworkByID(id)
2785 if net == nil {
2786 return ircError{&irc.Message{
2787 Command: "FAIL",
2788 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2789 }}
2790 }
2791
2792 record := net.Network // copy network record because we'll mutate it
2793 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2794 return err
2795 }
2796
2797 if record.Nick == dc.user.Username {
2798 record.Nick = ""
2799 }
2800 if record.Realname == dc.user.Realname {
2801 record.Realname = ""
2802 }
2803
2804 _, err = dc.user.updateNetwork(ctx, &record)
2805 if err != nil {
2806 return ircError{&irc.Message{
2807 Command: "FAIL",
2808 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2809 }}
2810 }
2811
2812 dc.SendMessage(&irc.Message{
2813 Prefix: dc.srv.prefix(),
2814 Command: "BOUNCER",
2815 Params: []string{"CHANGENETWORK", idStr},
2816 })
2817 case "DELNETWORK":
2818 var idStr string
2819 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2820 return err
2821 }
2822 id, err := parseBouncerNetID(subcommand, idStr)
2823 if err != nil {
2824 return err
2825 }
2826
2827 net := dc.user.getNetworkByID(id)
2828 if net == nil {
2829 return ircError{&irc.Message{
2830 Command: "FAIL",
2831 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2832 }}
2833 }
2834
2835 if err := dc.user.deleteNetwork(ctx, net.ID); err != nil {
2836 return err
2837 }
2838
2839 dc.SendMessage(&irc.Message{
2840 Prefix: dc.srv.prefix(),
2841 Command: "BOUNCER",
2842 Params: []string{"DELNETWORK", idStr},
2843 })
2844 default:
2845 return ircError{&irc.Message{
2846 Command: "FAIL",
2847 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2848 }}
2849 }
2850 default:
2851 dc.logger.Printf("unhandled message: %v", msg)
2852
2853 // Only forward unknown commands in single-upstream mode
2854 uc := dc.upstream()
2855 if uc == nil {
2856 return newUnknownCommandError(msg.Command)
2857 }
2858
2859 uc.SendMessageLabeled(ctx, dc.id, msg)
2860 }
2861 return nil
2862}
2863
2864func (dc *downstreamConn) handleNickServPRIVMSG(ctx context.Context, uc *upstreamConn, text string) {
2865 username, password, ok := parseNickServCredentials(text, uc.nick)
2866 if ok {
2867 uc.network.autoSaveSASLPlain(ctx, username, password)
2868 }
2869}
2870
2871func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2872 fields := strings.Fields(text)
2873 if len(fields) < 2 {
2874 return "", "", false
2875 }
2876 cmd := strings.ToUpper(fields[0])
2877 params := fields[1:]
2878 switch cmd {
2879 case "REGISTER":
2880 username = nick
2881 password = params[0]
2882 case "IDENTIFY":
2883 if len(params) == 1 {
2884 username = nick
2885 password = params[0]
2886 } else {
2887 username = params[0]
2888 password = params[1]
2889 }
2890 case "SET":
2891 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2892 username = nick
2893 password = params[1]
2894 }
2895 default:
2896 return "", "", false
2897 }
2898 return username, password, true
2899}
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