2 * Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com>
3 * Copyright (C) 2006 charybdis development team
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
9 * 1.Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2.Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3.The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
42 #include "s_newconf.h"
45 static const char sasl_desc
[] = "Provides SASL authentication support";
47 static void m_authenticate(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
48 static void me_sasl(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
49 static void me_mechlist(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
51 static void abort_sasl(struct Client
*);
52 static void abort_sasl_exit(hook_data_client_exit
*);
54 static void advertise_sasl(struct Client
*);
55 static void advertise_sasl_exit(hook_data_client_exit
*);
57 static unsigned int CLICAP_SASL
= 0;
58 static char mechlist_buf
[BUFSIZE
];
60 struct Message authenticate_msgtab
= {
61 "AUTHENTICATE", 0, 0, 0, 0,
62 {{m_authenticate
, 2}, {m_authenticate
, 2}, mg_ignore
, mg_ignore
, mg_ignore
, {m_authenticate
, 2}}
64 struct Message sasl_msgtab
= {
66 {mg_ignore
, mg_ignore
, mg_ignore
, mg_ignore
, {me_sasl
, 5}, mg_ignore
}
68 struct Message mechlist_msgtab
= {
69 "MECHLIST", 0, 0, 0, 0,
70 {mg_ignore
, mg_ignore
, mg_ignore
, mg_ignore
, {me_mechlist
, 2}, mg_ignore
}
73 mapi_clist_av1 sasl_clist
[] = {
74 &authenticate_msgtab
, &sasl_msgtab
, &mechlist_msgtab
, NULL
76 mapi_hfn_list_av1 sasl_hfnlist
[] = {
77 { "new_local_user", (hookfn
) abort_sasl
},
78 { "client_exit", (hookfn
) abort_sasl_exit
},
79 { "new_remote_user", (hookfn
) advertise_sasl
},
80 { "client_exit", (hookfn
) advertise_sasl_exit
},
85 sasl_visible(struct Client
*client_p
)
87 struct Client
*agent_p
= NULL
;
89 if (ConfigFileEntry
.sasl_service
)
90 agent_p
= find_named_client(ConfigFileEntry
.sasl_service
);
92 return agent_p
!= NULL
&& IsService(agent_p
);
96 sasl_data(struct Client
*client_p
)
98 return *mechlist_buf
!= 0 ? mechlist_buf
: NULL
;
101 static struct ClientCapability capdata_sasl
= {
102 .visible
= sasl_visible
,
104 .flags
= CLICAP_FLAGS_STICKY
,
110 memset(mechlist_buf
, 0, sizeof mechlist_buf
);
111 CLICAP_SASL
= capability_put(cli_capindex
, "sasl", &capdata_sasl
);
118 capability_orphan(cli_capindex
, "sasl");
121 DECLARE_MODULE_AV2(sasl
, _modinit
, _moddeinit
, sasl_clist
, NULL
, sasl_hfnlist
, NULL
, NULL
, sasl_desc
);
124 m_authenticate(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
125 int parc
, const char *parv
[])
127 struct Client
*agent_p
= NULL
;
128 struct Client
*saslserv_p
= NULL
;
130 /* They really should use CAP for their own sake. */
131 if(!IsCapable(source_p
, CLICAP_SASL
))
134 if(source_p
->localClient
->sasl_next_retry
> rb_current_time())
136 sendto_one(source_p
, form_str(RPL_LOAD2HI
), me
.name
, EmptyString(source_p
->name
) ? "*" : source_p
->name
, msgbuf_p
->cmd
);
140 if(strlen(client_p
->id
) == 3)
142 exit_client(client_p
, client_p
, client_p
, "Mixing client and server protocol");
146 if (*parv
[1] == ':' || strchr(parv
[1], ' '))
148 exit_client(client_p
, client_p
, client_p
, "Malformed AUTHENTICATE");
152 saslserv_p
= find_named_client(ConfigFileEntry
.sasl_service
);
153 if(saslserv_p
== NULL
|| !IsService(saslserv_p
))
155 sendto_one(source_p
, form_str(ERR_SASLABORTED
), me
.name
, EmptyString(source_p
->name
) ? "*" : source_p
->name
);
159 if(source_p
->localClient
->sasl_complete
)
161 *source_p
->localClient
->sasl_agent
= '\0';
162 source_p
->localClient
->sasl_complete
= 0;
165 if(strlen(parv
[1]) > 400)
167 sendto_one(source_p
, form_str(ERR_SASLTOOLONG
), me
.name
, EmptyString(source_p
->name
) ? "*" : source_p
->name
);
173 /* Allocate a UID. */
174 rb_strlcpy(source_p
->id
, generate_uid(), sizeof(source_p
->id
));
175 add_to_id_hash(source_p
->id
, source_p
);
178 if(*source_p
->localClient
->sasl_agent
)
179 agent_p
= find_id(source_p
->localClient
->sasl_agent
);
183 if (!strcmp(parv
[1], "*"))
185 sendto_one(source_p
, form_str(ERR_SASLABORTED
), me
.name
, EmptyString(source_p
->name
) ? "*" : source_p
->name
);
186 source_p
->localClient
->sasl_out
= 0;
190 sendto_one(saslserv_p
, ":%s ENCAP %s SASL %s %s H %s %s %c",
191 me
.id
, saslserv_p
->servptr
->name
, source_p
->id
, saslserv_p
->id
,
192 source_p
->host
, source_p
->sockhost
,
193 IsSSL(source_p
) ? 'S' : 'P');
195 if (source_p
->certfp
!= NULL
)
196 sendto_one(saslserv_p
, ":%s ENCAP %s SASL %s %s S %s %s",
197 me
.id
, saslserv_p
->servptr
->name
, source_p
->id
, saslserv_p
->id
,
198 parv
[1], source_p
->certfp
);
200 sendto_one(saslserv_p
, ":%s ENCAP %s SASL %s %s S %s",
201 me
.id
, saslserv_p
->servptr
->name
, source_p
->id
, saslserv_p
->id
,
204 rb_strlcpy(source_p
->localClient
->sasl_agent
, saslserv_p
->id
, IDLEN
);
208 if (!strcmp(parv
[1], "*"))
210 sendto_one(source_p
, form_str(ERR_SASLABORTED
), me
.name
, EmptyString(source_p
->name
) ? "*" : source_p
->name
);
211 sendto_one(agent_p
, ":%s ENCAP %s SASL %s %s D A", me
.id
, agent_p
->servptr
->name
, source_p
->id
, agent_p
->id
);
212 source_p
->localClient
->sasl_out
= 0;
216 sendto_one(agent_p
, ":%s ENCAP %s SASL %s %s C %s",
217 me
.id
, agent_p
->servptr
->name
, source_p
->id
, agent_p
->id
,
221 source_p
->localClient
->sasl_out
++;
225 me_sasl(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
226 int parc
, const char *parv
[])
228 struct Client
*target_p
, *agent_p
;
230 /* Let propagate if not addressed to us, or if broadcast.
231 * Only SASL agents can answer global requests.
233 if(strncmp(parv
[2], me
.id
, 3))
236 if((target_p
= find_id(parv
[2])) == NULL
)
239 if((agent_p
= find_id(parv
[1])) == NULL
)
242 if(source_p
!= agent_p
->servptr
) /* WTF?! */
245 /* We only accept messages from SASL agents; these must have umode +S
246 * (so the server must be listed in a service{} block).
248 if(!IsService(agent_p
))
251 /* Reject if someone has already answered. */
252 if(*target_p
->localClient
->sasl_agent
&& strncmp(parv
[1], target_p
->localClient
->sasl_agent
, IDLEN
))
254 else if(!*target_p
->localClient
->sasl_agent
)
255 rb_strlcpy(target_p
->localClient
->sasl_agent
, parv
[1], IDLEN
);
259 sendto_one(target_p
, "AUTHENTICATE %s", parv
[4]);
260 target_p
->localClient
->sasl_messages
++;
262 else if(*parv
[3] == 'D')
266 sendto_one(target_p
, form_str(ERR_SASLFAIL
), me
.name
, EmptyString(target_p
->name
) ? "*" : target_p
->name
);
267 /* Failures with zero messages are just "unknown mechanism" errors; don't count those. */
268 if(target_p
->localClient
->sasl_messages
> 0)
272 /* Allow 2 tries before rate-limiting as some clients try EXTERNAL
273 * then PLAIN right after it if the auth failed, causing the client to be
274 * rate-limited immediately and not being able to login with SASL.
276 if (target_p
->localClient
->sasl_failures
++ > 0)
277 target_p
->localClient
->sasl_next_retry
= rb_current_time() + (1 << MIN(target_p
->localClient
->sasl_failures
+ 1, 8));
279 else if(throttle_add((struct sockaddr
*)&target_p
->localClient
->ip
))
281 exit_client(target_p
, target_p
, &me
, "Too many failed authentication attempts");
286 else if(*parv
[4] == 'S')
288 sendto_one(target_p
, form_str(RPL_SASLSUCCESS
), me
.name
, EmptyString(target_p
->name
) ? "*" : target_p
->name
);
289 target_p
->localClient
->sasl_failures
= 0;
290 target_p
->localClient
->sasl_complete
= 1;
291 ServerStats
.is_ssuc
++;
293 *target_p
->localClient
->sasl_agent
= '\0'; /* Blank the stored agent so someone else can answer */
294 target_p
->localClient
->sasl_messages
= 0;
296 else if(*parv
[3] == 'M')
297 sendto_one(target_p
, form_str(RPL_SASLMECHS
), me
.name
, EmptyString(target_p
->name
) ? "*" : target_p
->name
, parv
[4]);
301 me_mechlist(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
302 int parc
, const char *parv
[])
304 rb_strlcpy(mechlist_buf
, parv
[1], sizeof mechlist_buf
);
307 /* If the client never finished authenticating but is
308 * registering anyway, abort the exchange.
311 abort_sasl(struct Client
*data
)
313 if(data
->localClient
->sasl_out
== 0 || data
->localClient
->sasl_complete
)
316 data
->localClient
->sasl_out
= data
->localClient
->sasl_complete
= 0;
317 ServerStats
.is_sbad
++;
320 sendto_one(data
, form_str(ERR_SASLABORTED
), me
.name
, EmptyString(data
->name
) ? "*" : data
->name
);
322 if(*data
->localClient
->sasl_agent
)
324 struct Client
*agent_p
= find_id(data
->localClient
->sasl_agent
);
327 sendto_one(agent_p
, ":%s ENCAP %s SASL %s %s D A", me
.id
, agent_p
->servptr
->name
,
328 data
->id
, agent_p
->id
);
333 sendto_server(NULL
, NULL
, CAP_TS6
|CAP_ENCAP
, NOCAPS
, ":%s ENCAP * SASL %s * D A", me
.id
,
338 abort_sasl_exit(hook_data_client_exit
*data
)
340 if (data
->target
->localClient
)
341 abort_sasl(data
->target
);
345 advertise_sasl(struct Client
*client_p
)
347 if (!ConfigFileEntry
.sasl_service
)
350 if (irccmp(client_p
->name
, ConfigFileEntry
.sasl_service
))
353 sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY
, ":%s CAP * NEW :sasl", me
.name
);
357 advertise_sasl_exit(hook_data_client_exit
*data
)
359 if (!ConfigFileEntry
.sasl_service
)
362 if (irccmp(data
->target
->name
, ConfigFileEntry
.sasl_service
))
365 sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY
, ":%s CAP * DEL :sasl", me
.name
);