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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 |
15b05f95 | 4 | * Copyright (C) 2016 ChatLounge IRC Network Development Team |
212380e3 AC |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions are | |
8 | * met: | |
9 | * | |
10 | * 1.Redistributions of source code must retain the above copyright notice, | |
11 | * this list of conditions and the following disclaimer. | |
12 | * 2.Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * 3.The name of the author may not be used to endorse or promote products | |
16 | * derived from this software without specific prior written permission. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
22 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
26 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
27 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
28 | * POSSIBILITY OF SUCH DAMAGE. | |
212380e3 AC |
29 | */ |
30 | ||
31 | #include "stdinc.h" | |
32 | ||
33 | #include "client.h" | |
34 | #include "hash.h" | |
35 | #include "send.h" | |
36 | #include "msg.h" | |
37 | #include "modules.h" | |
38 | #include "numeric.h" | |
37289346 | 39 | #include "reject.h" |
212380e3 AC |
40 | #include "s_serv.h" |
41 | #include "s_stats.h" | |
42 | #include "string.h" | |
7d33cce8 MT |
43 | #include "s_newconf.h" |
44 | #include "s_conf.h" | |
212380e3 | 45 | |
eeabf33a EM |
46 | static const char sasl_desc[] = "Provides SASL authentication support"; |
47 | ||
3c7d6fcc EM |
48 | static void m_authenticate(struct MsgBuf *, struct Client *, struct Client *, int, const char **); |
49 | static void me_sasl(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
50 | static void me_mechlist(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
212380e3 AC |
51 | |
52 | static void abort_sasl(struct Client *); | |
53 | static void abort_sasl_exit(hook_data_client_exit *); | |
54 | ||
da3e5fcb AC |
55 | static unsigned int CLICAP_SASL = 0; |
56 | static char mechlist_buf[BUFSIZE]; | |
193d4db3 | 57 | |
212380e3 | 58 | struct Message authenticate_msgtab = { |
7baa37a9 | 59 | "AUTHENTICATE", 0, 0, 0, 0, |
ef3ab8e3 | 60 | {{m_authenticate, 2}, {m_authenticate, 2}, mg_ignore, mg_ignore, mg_ignore, {m_authenticate, 2}} |
212380e3 AC |
61 | }; |
62 | struct Message sasl_msgtab = { | |
7baa37a9 | 63 | "SASL", 0, 0, 0, 0, |
212380e3 AC |
64 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_sasl, 5}, mg_ignore} |
65 | }; | |
da3e5fcb AC |
66 | struct Message mechlist_msgtab = { |
67 | "MECHLIST", 0, 0, 0, 0, | |
68 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_mechlist, 2}, mg_ignore} | |
69 | }; | |
212380e3 | 70 | |
55abcbb2 | 71 | mapi_clist_av1 sasl_clist[] = { |
da3e5fcb | 72 | &authenticate_msgtab, &sasl_msgtab, &mechlist_msgtab, NULL |
212380e3 AC |
73 | }; |
74 | mapi_hfn_list_av1 sasl_hfnlist[] = { | |
75 | { "new_local_user", (hookfn) abort_sasl }, | |
76 | { "client_exit", (hookfn) abort_sasl_exit }, | |
77 | { NULL, NULL } | |
78 | }; | |
79 | ||
da3e5fcb | 80 | static const char * |
38ffccf8 | 81 | sasl_data(struct Client *client_p) |
da3e5fcb AC |
82 | { |
83 | return *mechlist_buf != 0 ? mechlist_buf : NULL; | |
84 | } | |
85 | ||
193d4db3 | 86 | static struct ClientCapability capdata_sasl = { |
da3e5fcb | 87 | .data = sasl_data, |
738b5d29 | 88 | .flags = CLICAP_FLAGS_STICKY | CLICAP_FLAGS_PRIORITY, |
193d4db3 AC |
89 | }; |
90 | ||
3792c63d AC |
91 | mapi_cap_list_av2 sasl_cap_list[] = { |
92 | { MAPI_CAP_CLIENT, "sasl", &capdata_sasl, &CLICAP_SASL }, | |
93 | { 0, NULL, NULL, NULL }, | |
94 | }; | |
95 | ||
193d4db3 AC |
96 | static int |
97 | _modinit(void) | |
98 | { | |
da3e5fcb | 99 | memset(mechlist_buf, 0, sizeof mechlist_buf); |
193d4db3 AC |
100 | return 0; |
101 | } | |
102 | ||
e83449d5 | 103 | DECLARE_MODULE_AV2(sasl, _modinit, NULL, sasl_clist, NULL, sasl_hfnlist, sasl_cap_list, NULL, sasl_desc); |
212380e3 | 104 | |
3c7d6fcc | 105 | static void |
428ca87b | 106 | m_authenticate(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
107 | int parc, const char *parv[]) |
108 | { | |
109 | struct Client *agent_p = NULL; | |
7d33cce8 | 110 | struct Client *saslserv_p = NULL; |
212380e3 AC |
111 | |
112 | /* They really should use CAP for their own sake. */ | |
113 | if(!IsCapable(source_p, CLICAP_SASL)) | |
3c7d6fcc | 114 | return; |
212380e3 | 115 | |
9d07a42d MM |
116 | if(source_p->localClient->sasl_next_retry > rb_current_time()) |
117 | { | |
118 | sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, EmptyString(source_p->name) ? "*" : source_p->name, msgbuf_p->cmd); | |
119 | return; | |
120 | } | |
121 | ||
d5d52a99 | 122 | if (strlen(client_p->id) == 3 || (source_p->preClient && !EmptyString(source_p->preClient->id))) |
1b19fe8b JT |
123 | { |
124 | exit_client(client_p, client_p, client_p, "Mixing client and server protocol"); | |
3c7d6fcc | 125 | return; |
1b19fe8b JT |
126 | } |
127 | ||
ac88154f AJ |
128 | if (*parv[1] == ':' || strchr(parv[1], ' ')) |
129 | { | |
130 | exit_client(client_p, client_p, client_p, "Malformed AUTHENTICATE"); | |
131 | return; | |
132 | } | |
133 | ||
7d33cce8 | 134 | saslserv_p = find_named_client(ConfigFileEntry.sasl_service); |
9d07a42d | 135 | if(saslserv_p == NULL || !IsService(saslserv_p)) |
7d33cce8 MT |
136 | { |
137 | sendto_one(source_p, form_str(ERR_SASLABORTED), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
3c7d6fcc | 138 | return; |
7d33cce8 MT |
139 | } |
140 | ||
c6bc97fd | 141 | if(source_p->localClient->sasl_complete) |
212380e3 | 142 | { |
51535fcb | 143 | *source_p->localClient->sasl_agent = '\0'; |
c6bc97fd | 144 | source_p->localClient->sasl_complete = 0; |
212380e3 AC |
145 | } |
146 | ||
147 | if(strlen(parv[1]) > 400) | |
148 | { | |
149 | sendto_one(source_p, form_str(ERR_SASLTOOLONG), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
3c7d6fcc | 150 | return; |
212380e3 AC |
151 | } |
152 | ||
153 | if(!*source_p->id) | |
154 | { | |
155 | /* Allocate a UID. */ | |
4d5a902f | 156 | rb_strlcpy(source_p->id, generate_uid(), sizeof(source_p->id)); |
212380e3 AC |
157 | add_to_id_hash(source_p->id, source_p); |
158 | } | |
159 | ||
c6bc97fd AC |
160 | if(*source_p->localClient->sasl_agent) |
161 | agent_p = find_id(source_p->localClient->sasl_agent); | |
212380e3 AC |
162 | |
163 | if(agent_p == NULL) | |
572488e0 | 164 | { |
280ce6a9 AJ |
165 | if (!strcmp(parv[1], "*")) |
166 | { | |
167 | sendto_one(source_p, form_str(ERR_SASLABORTED), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
6d8a8851 | 168 | source_p->localClient->sasl_out = 0; |
631c3089 | 169 | return; |
280ce6a9 AJ |
170 | } |
171 | ||
0ee833da | 172 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s H %s %s %c", |
1cae2411 | 173 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, |
0ee833da | 174 | source_p->host, source_p->sockhost, |
8b7110d6 | 175 | IsSecure(source_p) ? 'S' : 'P'); |
a3fa9d81 | 176 | |
802710b5 | 177 | if (source_p->certfp != NULL) |
6fb9f214 MM |
178 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s S %s %s", |
179 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, | |
180 | parv[1], source_p->certfp); | |
572488e0 | 181 | else |
6fb9f214 MM |
182 | sendto_one(saslserv_p, ":%s ENCAP %s SASL %s %s S %s", |
183 | me.id, saslserv_p->servptr->name, source_p->id, saslserv_p->id, | |
184 | parv[1]); | |
7d33cce8 | 185 | |
c6bc97fd | 186 | rb_strlcpy(source_p->localClient->sasl_agent, saslserv_p->id, IDLEN); |
572488e0 | 187 | } |
212380e3 | 188 | else |
280ce6a9 AJ |
189 | { |
190 | if (!strcmp(parv[1], "*")) | |
191 | { | |
192 | sendto_one(source_p, form_str(ERR_SASLABORTED), me.name, EmptyString(source_p->name) ? "*" : source_p->name); | |
193 | sendto_one(agent_p, ":%s ENCAP %s SASL %s %s D A", me.id, agent_p->servptr->name, source_p->id, agent_p->id); | |
6d8a8851 | 194 | source_p->localClient->sasl_out = 0; |
631c3089 | 195 | return; |
280ce6a9 AJ |
196 | } |
197 | ||
6fb9f214 MM |
198 | sendto_one(agent_p, ":%s ENCAP %s SASL %s %s C %s", |
199 | me.id, agent_p->servptr->name, source_p->id, agent_p->id, | |
7d33cce8 | 200 | parv[1]); |
280ce6a9 AJ |
201 | } |
202 | ||
c6bc97fd | 203 | source_p->localClient->sasl_out++; |
212380e3 AC |
204 | } |
205 | ||
3c7d6fcc | 206 | static void |
428ca87b | 207 | me_sasl(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
208 | int parc, const char *parv[]) |
209 | { | |
210 | struct Client *target_p, *agent_p; | |
40a766a0 | 211 | bool in_progress; |
212380e3 AC |
212 | |
213 | /* Let propagate if not addressed to us, or if broadcast. | |
214 | * Only SASL agents can answer global requests. | |
215 | */ | |
216 | if(strncmp(parv[2], me.id, 3)) | |
3c7d6fcc | 217 | return; |
212380e3 AC |
218 | |
219 | if((target_p = find_id(parv[2])) == NULL) | |
3c7d6fcc | 220 | return; |
212380e3 | 221 | |
212380e3 | 222 | if((agent_p = find_id(parv[1])) == NULL) |
3c7d6fcc | 223 | return; |
212380e3 AC |
224 | |
225 | if(source_p != agent_p->servptr) /* WTF?! */ | |
3c7d6fcc | 226 | return; |
212380e3 AC |
227 | |
228 | /* We only accept messages from SASL agents; these must have umode +S | |
229 | * (so the server must be listed in a service{} block). | |
230 | */ | |
231 | if(!IsService(agent_p)) | |
3c7d6fcc | 232 | return; |
212380e3 | 233 | |
40a766a0 SA |
234 | /* If SASL has been aborted, we only want to track authentication failures. */ |
235 | in_progress = target_p->localClient->sasl_out != 0; | |
236 | ||
212380e3 | 237 | /* Reject if someone has already answered. */ |
c6bc97fd | 238 | if(*target_p->localClient->sasl_agent && strncmp(parv[1], target_p->localClient->sasl_agent, IDLEN)) |
3c7d6fcc | 239 | return; |
40a766a0 | 240 | else if(!*target_p->localClient->sasl_agent && in_progress) |
c6bc97fd | 241 | rb_strlcpy(target_p->localClient->sasl_agent, parv[1], IDLEN); |
212380e3 | 242 | |
f62f94b0 | 243 | if(*parv[3] == 'C') |
37289346 | 244 | { |
40a766a0 SA |
245 | if (in_progress) { |
246 | sendto_one(target_p, "AUTHENTICATE %s", parv[4]); | |
247 | target_p->localClient->sasl_messages++; | |
248 | } | |
37289346 | 249 | } |
212380e3 AC |
250 | else if(*parv[3] == 'D') |
251 | { | |
834579ce MM |
252 | if(*parv[4] == 'F') |
253 | { | |
40a766a0 SA |
254 | if (in_progress) { |
255 | sendto_one(target_p, form_str(ERR_SASLFAIL), me.name, EmptyString(target_p->name) ? "*" : target_p->name); | |
256 | } | |
9d07a42d | 257 | /* Failures with zero messages are just "unknown mechanism" errors; don't count those. */ |
834579ce | 258 | if(target_p->localClient->sasl_messages > 0) |
37289346 | 259 | { |
9d07a42d MM |
260 | if(*target_p->name) |
261 | { | |
46ef49c3 X |
262 | /* Allow 2 tries before rate-limiting as some clients try EXTERNAL |
263 | * then PLAIN right after it if the auth failed, causing the client to be | |
264 | * rate-limited immediately and not being able to login with SASL. | |
265 | */ | |
266 | if (target_p->localClient->sasl_failures++ > 0) | |
23f5c317 | 267 | target_p->localClient->sasl_next_retry = rb_current_time() + (1 << MIN(target_p->localClient->sasl_failures + 1, 8)); |
9d07a42d MM |
268 | } |
269 | else if(throttle_add((struct sockaddr*)&target_p->localClient->ip)) | |
37289346 MM |
270 | { |
271 | exit_client(target_p, target_p, &me, "Too many failed authentication attempts"); | |
272 | return; | |
273 | } | |
274 | } | |
275 | } | |
834579ce MM |
276 | else if(*parv[4] == 'S') |
277 | { | |
40a766a0 SA |
278 | if (in_progress) { |
279 | sendto_one(target_p, form_str(RPL_SASLSUCCESS), me.name, EmptyString(target_p->name) ? "*" : target_p->name); | |
280 | target_p->localClient->sasl_failures = 0; | |
281 | target_p->localClient->sasl_complete = 1; | |
282 | ServerStats.is_ssuc++; | |
283 | } | |
212380e3 | 284 | } |
c6bc97fd | 285 | *target_p->localClient->sasl_agent = '\0'; /* Blank the stored agent so someone else can answer */ |
37289346 | 286 | target_p->localClient->sasl_messages = 0; |
212380e3 | 287 | } |
dbd8ca2b | 288 | else if(*parv[3] == 'M') |
40a766a0 SA |
289 | { |
290 | if (in_progress) { | |
291 | sendto_one(target_p, form_str(RPL_SASLMECHS), me.name, EmptyString(target_p->name) ? "*" : target_p->name, parv[4]); | |
292 | } | |
293 | } | |
212380e3 AC |
294 | } |
295 | ||
3c7d6fcc | 296 | static void |
da3e5fcb AC |
297 | me_mechlist(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
298 | int parc, const char *parv[]) | |
299 | { | |
300 | rb_strlcpy(mechlist_buf, parv[1], sizeof mechlist_buf); | |
da3e5fcb AC |
301 | } |
302 | ||
212380e3 AC |
303 | /* If the client never finished authenticating but is |
304 | * registering anyway, abort the exchange. | |
305 | */ | |
306 | static void | |
307 | abort_sasl(struct Client *data) | |
308 | { | |
c6bc97fd | 309 | if(data->localClient->sasl_out == 0 || data->localClient->sasl_complete) |
212380e3 AC |
310 | return; |
311 | ||
c6bc97fd | 312 | data->localClient->sasl_out = data->localClient->sasl_complete = 0; |
47adde3d | 313 | ServerStats.is_sbad++; |
212380e3 AC |
314 | |
315 | if(!IsClosing(data)) | |
316 | sendto_one(data, form_str(ERR_SASLABORTED), me.name, EmptyString(data->name) ? "*" : data->name); | |
317 | ||
c6bc97fd | 318 | if(*data->localClient->sasl_agent) |
212380e3 | 319 | { |
c6bc97fd | 320 | struct Client *agent_p = find_id(data->localClient->sasl_agent); |
212380e3 AC |
321 | if(agent_p) |
322 | { | |
323 | sendto_one(agent_p, ":%s ENCAP %s SASL %s %s D A", me.id, agent_p->servptr->name, | |
324 | data->id, agent_p->id); | |
325 | return; | |
326 | } | |
327 | } | |
328 | ||
329 | sendto_server(NULL, NULL, CAP_TS6|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * D A", me.id, | |
330 | data->id); | |
331 | } | |
332 | ||
333 | static void | |
334 | abort_sasl_exit(hook_data_client_exit *data) | |
335 | { | |
c23902ae AC |
336 | if (data->target->localClient) |
337 | abort_sasl(data->target); | |
212380e3 | 338 | } |