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212380e3 AC |
1 | /* modules/m_sasl.c |
2 | * Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com> | |
f62f94b0 | 3 | * Copyright (C) 2006 charybdis development team |
212380e3 AC |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions are | |
7 | * met: | |
8 | * | |
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. | |
16 | * | |
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. | |
212380e3 AC |
28 | */ |
29 | ||
30 | #include "stdinc.h" | |
31 | ||
32 | #include "client.h" | |
33 | #include "hash.h" | |
34 | #include "send.h" | |
35 | #include "msg.h" | |
36 | #include "modules.h" | |
37 | #include "numeric.h" | |
37289346 | 38 | #include "reject.h" |
212380e3 AC |
39 | #include "s_serv.h" |
40 | #include "s_stats.h" | |
41 | #include "string.h" | |
7d33cce8 MT |
42 | #include "s_newconf.h" |
43 | #include "s_conf.h" | |
212380e3 | 44 | |
eeabf33a EM |
45 | static const char sasl_desc[] = "Provides SASL authentication support"; |
46 | ||
3c7d6fcc EM |
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 **); | |
212380e3 AC |
50 | |
51 | static void abort_sasl(struct Client *); | |
52 | static void abort_sasl_exit(hook_data_client_exit *); | |
53 | ||
12565204 AC |
54 | static void advertise_sasl(struct Client *); |
55 | static void advertise_sasl_exit(hook_data_client_exit *); | |
56 | ||
da3e5fcb AC |
57 | static unsigned int CLICAP_SASL = 0; |
58 | static char mechlist_buf[BUFSIZE]; | |
193d4db3 | 59 | |
212380e3 | 60 | struct Message authenticate_msgtab = { |
7baa37a9 | 61 | "AUTHENTICATE", 0, 0, 0, 0, |
ef3ab8e3 | 62 | {{m_authenticate, 2}, {m_authenticate, 2}, mg_ignore, mg_ignore, mg_ignore, {m_authenticate, 2}} |
212380e3 AC |
63 | }; |
64 | struct Message sasl_msgtab = { | |
7baa37a9 | 65 | "SASL", 0, 0, 0, 0, |
212380e3 AC |
66 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_sasl, 5}, mg_ignore} |
67 | }; | |
da3e5fcb AC |
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} | |
71 | }; | |
212380e3 | 72 | |
55abcbb2 | 73 | mapi_clist_av1 sasl_clist[] = { |
da3e5fcb | 74 | &authenticate_msgtab, &sasl_msgtab, &mechlist_msgtab, NULL |
212380e3 AC |
75 | }; |
76 | mapi_hfn_list_av1 sasl_hfnlist[] = { | |
77 | { "new_local_user", (hookfn) abort_sasl }, | |
78 | { "client_exit", (hookfn) abort_sasl_exit }, | |
12565204 AC |
79 | { "new_remote_user", (hookfn) advertise_sasl }, |
80 | { "client_exit", (hookfn) advertise_sasl_exit }, | |
212380e3 AC |
81 | { NULL, NULL } |
82 | }; | |
83 | ||
3c7d6fcc | 84 | static bool |
38ffccf8 | 85 | sasl_visible(struct Client *client_p) |
193d4db3 AC |
86 | { |
87 | struct Client *agent_p = NULL; | |
88 | ||
89 | if (ConfigFileEntry.sasl_service) | |
90 | agent_p = find_named_client(ConfigFileEntry.sasl_service); | |
91 | ||
92 | return agent_p != NULL && IsService(agent_p); | |
93 | } | |
94 | ||
da3e5fcb | 95 | static const char * |
38ffccf8 | 96 | sasl_data(struct Client *client_p) |
da3e5fcb AC |
97 | { |
98 | return *mechlist_buf != 0 ? mechlist_buf : NULL; | |
99 | } | |
100 | ||
193d4db3 AC |
101 | static struct ClientCapability capdata_sasl = { |
102 | .visible = sasl_visible, | |
da3e5fcb | 103 | .data = sasl_data, |
193d4db3 AC |
104 | .flags = CLICAP_FLAGS_STICKY, |
105 | }; | |
106 | ||
107 | static int | |
108 | _modinit(void) | |
109 | { | |
da3e5fcb | 110 | memset(mechlist_buf, 0, sizeof mechlist_buf); |
193d4db3 AC |
111 | CLICAP_SASL = capability_put(cli_capindex, "sasl", &capdata_sasl); |
112 | return 0; | |
113 | } | |
114 | ||
115 | static void | |
116 | _moddeinit(void) | |
117 | { | |
118 | capability_orphan(cli_capindex, "sasl"); | |
119 | } | |
120 | ||
3abc337f | 121 | DECLARE_MODULE_AV2(sasl, _modinit, _moddeinit, sasl_clist, NULL, sasl_hfnlist, NULL, NULL, sasl_desc); |
212380e3 | 122 | |
3c7d6fcc | 123 | static void |
428ca87b | 124 | m_authenticate(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
125 | int parc, const char *parv[]) |
126 | { | |
127 | struct Client *agent_p = NULL; | |
7d33cce8 | 128 | struct Client *saslserv_p = NULL; |
212380e3 AC |
129 | |
130 | /* They really should use CAP for their own sake. */ | |
131 | if(!IsCapable(source_p, CLICAP_SASL)) | |
3c7d6fcc | 132 | return; |
212380e3 | 133 | |
9d07a42d MM |
134 | if(source_p->localClient->sasl_next_retry > rb_current_time()) |
135 | { | |
136 | sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, EmptyString(source_p->name) ? "*" : source_p->name, msgbuf_p->cmd); | |
137 | return; | |
138 | } | |
139 | ||
140 | if(strlen(client_p->id) == 3) | |
1b19fe8b JT |
141 | { |
142 | exit_client(client_p, client_p, client_p, "Mixing client and server protocol"); | |
3c7d6fcc | 143 | return; |
1b19fe8b JT |
144 | } |
145 | ||
7d33cce8 | 146 | saslserv_p = find_named_client(ConfigFileEntry.sasl_service); |
9d07a42d | 147 | if(saslserv_p == NULL || !IsService(saslserv_p)) |
7d33cce8 MT |
148 | { |
149 | sendto_one(source_p, form_str(ERR_SASLABORTED), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
3c7d6fcc | 150 | return; |
7d33cce8 MT |
151 | } |
152 | ||
c6bc97fd | 153 | if(source_p->localClient->sasl_complete) |
212380e3 | 154 | { |
51535fcb | 155 | *source_p->localClient->sasl_agent = '\0'; |
c6bc97fd | 156 | source_p->localClient->sasl_complete = 0; |
212380e3 AC |
157 | } |
158 | ||
159 | if(strlen(parv[1]) > 400) | |
160 | { | |
161 | sendto_one(source_p, form_str(ERR_SASLTOOLONG), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
3c7d6fcc | 162 | return; |
212380e3 AC |
163 | } |
164 | ||
165 | if(!*source_p->id) | |
166 | { | |
167 | /* Allocate a UID. */ | |
0982871a | 168 | rb_strlcpy(source_p->id, generate_uid(), sizeof(source_p->id)); |
212380e3 AC |
169 | add_to_id_hash(source_p->id, source_p); |
170 | } | |
171 | ||
c6bc97fd AC |
172 | if(*source_p->localClient->sasl_agent) |
173 | agent_p = find_id(source_p->localClient->sasl_agent); | |
212380e3 AC |
174 | |
175 | if(agent_p == NULL) | |
572488e0 | 176 | { |
1cae2411 MM |
177 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s H %s %s", |
178 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, | |
179 | source_p->host, source_p->sockhost); | |
a3fa9d81 | 180 | |
802710b5 | 181 | if (source_p->certfp != NULL) |
6fb9f214 MM |
182 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s S %s %s", |
183 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, | |
184 | parv[1], source_p->certfp); | |
572488e0 | 185 | else |
6fb9f214 MM |
186 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s S %s", |
187 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, | |
188 | parv[1]); | |
7d33cce8 | 189 | |
c6bc97fd | 190 | rb_strlcpy(source_p->localClient->sasl_agent, saslserv_p->id, IDLEN); |
572488e0 | 191 | } |
212380e3 | 192 | else |
6fb9f214 MM |
193 | sendto_one(agent_p, ":%s ENCAP %s SASL %s %s C %s", |
194 | me.id, agent_p->servptr->name, source_p->id, agent_p->id, | |
7d33cce8 | 195 | parv[1]); |
c6bc97fd | 196 | source_p->localClient->sasl_out++; |
212380e3 AC |
197 | } |
198 | ||
3c7d6fcc | 199 | static void |
428ca87b | 200 | me_sasl(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
201 | int parc, const char *parv[]) |
202 | { | |
203 | struct Client *target_p, *agent_p; | |
204 | ||
205 | /* Let propagate if not addressed to us, or if broadcast. | |
206 | * Only SASL agents can answer global requests. | |
207 | */ | |
208 | if(strncmp(parv[2], me.id, 3)) | |
3c7d6fcc | 209 | return; |
212380e3 AC |
210 | |
211 | if((target_p = find_id(parv[2])) == NULL) | |
3c7d6fcc | 212 | return; |
212380e3 | 213 | |
212380e3 | 214 | if((agent_p = find_id(parv[1])) == NULL) |
3c7d6fcc | 215 | return; |
212380e3 AC |
216 | |
217 | if(source_p != agent_p->servptr) /* WTF?! */ | |
3c7d6fcc | 218 | return; |
212380e3 AC |
219 | |
220 | /* We only accept messages from SASL agents; these must have umode +S | |
221 | * (so the server must be listed in a service{} block). | |
222 | */ | |
223 | if(!IsService(agent_p)) | |
3c7d6fcc | 224 | return; |
212380e3 AC |
225 | |
226 | /* Reject if someone has already answered. */ | |
c6bc97fd | 227 | if(*target_p->localClient->sasl_agent && strncmp(parv[1], target_p->localClient->sasl_agent, IDLEN)) |
3c7d6fcc | 228 | return; |
c6bc97fd AC |
229 | else if(!*target_p->localClient->sasl_agent) |
230 | rb_strlcpy(target_p->localClient->sasl_agent, parv[1], IDLEN); | |
212380e3 | 231 | |
f62f94b0 | 232 | if(*parv[3] == 'C') |
37289346 | 233 | { |
212380e3 | 234 | sendto_one(target_p, "AUTHENTICATE %s", parv[4]); |
37289346 MM |
235 | target_p->localClient->sasl_messages++; |
236 | } | |
212380e3 AC |
237 | else if(*parv[3] == 'D') |
238 | { | |
834579ce MM |
239 | if(*parv[4] == 'F') |
240 | { | |
212380e3 | 241 | sendto_one(target_p, form_str(ERR_SASLFAIL), me.name, EmptyString(target_p->name) ? "*" : target_p->name); |
9d07a42d | 242 | /* Failures with zero messages are just "unknown mechanism" errors; don't count those. */ |
834579ce | 243 | if(target_p->localClient->sasl_messages > 0) |
37289346 | 244 | { |
9d07a42d MM |
245 | if(*target_p->name) |
246 | { | |
247 | target_p->localClient->sasl_failures++; | |
248 | target_p->localClient->sasl_next_retry = rb_current_time() + (1 << MIN(target_p->localClient->sasl_failures + 5, 13)); | |
249 | } | |
250 | else if(throttle_add((struct sockaddr*)&target_p->localClient->ip)) | |
37289346 MM |
251 | { |
252 | exit_client(target_p, target_p, &me, "Too many failed authentication attempts"); | |
253 | return; | |
254 | } | |
255 | } | |
256 | } | |
834579ce MM |
257 | else if(*parv[4] == 'S') |
258 | { | |
212380e3 | 259 | sendto_one(target_p, form_str(RPL_SASLSUCCESS), me.name, EmptyString(target_p->name) ? "*" : target_p->name); |
9d07a42d | 260 | target_p->localClient->sasl_failures = 0; |
c6bc97fd | 261 | target_p->localClient->sasl_complete = 1; |
47adde3d | 262 | ServerStats.is_ssuc++; |
212380e3 | 263 | } |
c6bc97fd | 264 | *target_p->localClient->sasl_agent = '\0'; /* Blank the stored agent so someone else can answer */ |
37289346 | 265 | target_p->localClient->sasl_messages = 0; |
212380e3 | 266 | } |
dbd8ca2b MM |
267 | else if(*parv[3] == 'M') |
268 | sendto_one(target_p, form_str(RPL_SASLMECHS), me.name, EmptyString(target_p->name) ? "*" : target_p->name, parv[4]); | |
212380e3 AC |
269 | } |
270 | ||
3c7d6fcc | 271 | static void |
da3e5fcb AC |
272 | me_mechlist(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
273 | int parc, const char *parv[]) | |
274 | { | |
275 | rb_strlcpy(mechlist_buf, parv[1], sizeof mechlist_buf); | |
da3e5fcb AC |
276 | } |
277 | ||
212380e3 AC |
278 | /* If the client never finished authenticating but is |
279 | * registering anyway, abort the exchange. | |
280 | */ | |
281 | static void | |
282 | abort_sasl(struct Client *data) | |
283 | { | |
c6bc97fd | 284 | if(data->localClient->sasl_out == 0 || data->localClient->sasl_complete) |
212380e3 AC |
285 | return; |
286 | ||
c6bc97fd | 287 | data->localClient->sasl_out = data->localClient->sasl_complete = 0; |
47adde3d | 288 | ServerStats.is_sbad++; |
212380e3 AC |
289 | |
290 | if(!IsClosing(data)) | |
291 | sendto_one(data, form_str(ERR_SASLABORTED), me.name, EmptyString(data->name) ? "*" : data->name); | |
292 | ||
c6bc97fd | 293 | if(*data->localClient->sasl_agent) |
212380e3 | 294 | { |
c6bc97fd | 295 | struct Client *agent_p = find_id(data->localClient->sasl_agent); |
212380e3 AC |
296 | if(agent_p) |
297 | { | |
298 | sendto_one(agent_p, ":%s ENCAP %s SASL %s %s D A", me.id, agent_p->servptr->name, | |
299 | data->id, agent_p->id); | |
300 | return; | |
301 | } | |
302 | } | |
303 | ||
304 | sendto_server(NULL, NULL, CAP_TS6|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * D A", me.id, | |
305 | data->id); | |
306 | } | |
307 | ||
308 | static void | |
309 | abort_sasl_exit(hook_data_client_exit *data) | |
310 | { | |
c23902ae AC |
311 | if (data->target->localClient) |
312 | abort_sasl(data->target); | |
212380e3 AC |
313 | } |
314 | ||
12565204 AC |
315 | static void |
316 | advertise_sasl(struct Client *client_p) | |
317 | { | |
318 | if (!ConfigFileEntry.sasl_service) | |
319 | return; | |
320 | ||
321 | if (irccmp(client_p->name, ConfigFileEntry.sasl_service)) | |
322 | return; | |
323 | ||
324 | sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * NEW :sasl", me.name); | |
325 | } | |
326 | ||
327 | static void | |
328 | advertise_sasl_exit(hook_data_client_exit *data) | |
329 | { | |
330 | if (!ConfigFileEntry.sasl_service) | |
331 | return; | |
332 | ||
333 | if (irccmp(data->target->name, ConfigFileEntry.sasl_service)) | |
334 | return; | |
335 | ||
336 | sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * DEL :sasl", me.name); | |
337 | } |