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1 | /* modules/m_signon.c | |
2 | * Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com> | |
3 | * Copyright (C) 2006 charybdis development team | |
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. | |
28 | */ | |
29 | ||
30 | #include "stdinc.h" | |
31 | ||
32 | #include "send.h" | |
33 | #include "channel.h" | |
34 | #include "client.h" | |
35 | #include "defaults.h" | |
36 | #include "ircd.h" | |
37 | #include "numeric.h" | |
38 | #include "s_conf.h" | |
39 | #include "s_serv.h" | |
40 | #include "hash.h" | |
41 | #include "msg.h" | |
42 | #include "parse.h" | |
43 | #include "modules.h" | |
44 | #include "whowas.h" | |
45 | #include "monitor.h" | |
46 | #include "s_stats.h" | |
47 | #include "snomask.h" | |
48 | #include "match.h" | |
49 | #include "s_user.h" | |
50 | ||
51 | static const char signon_desc[] = "Provides account login/logout support for services"; | |
52 | ||
53 | static void me_svslogin(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
54 | static void ms_signon(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
55 | ||
56 | static void send_signon(struct Client *, struct Client *, const char *, const char *, const char *, unsigned int, const char *); | |
57 | ||
58 | struct Message svslogin_msgtab = { | |
59 | "SVSLOGIN", 0, 0, 0, 0, | |
60 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_svslogin, 6}, mg_ignore} | |
61 | }; | |
62 | struct Message signon_msgtab = { | |
63 | "SIGNON", 0, 0, 0, 0, | |
64 | {mg_ignore, mg_ignore, {ms_signon, 6}, mg_ignore, mg_ignore, mg_ignore} | |
65 | }; | |
66 | ||
67 | mapi_clist_av1 signon_clist[] = { | |
68 | &svslogin_msgtab, &signon_msgtab, NULL | |
69 | }; | |
70 | ||
71 | DECLARE_MODULE_AV2(signon, NULL, NULL, signon_clist, NULL, NULL, NULL, NULL, signon_desc); | |
72 | ||
73 | #define NICK_VALID 1 | |
74 | #define USER_VALID 2 | |
75 | #define HOST_VALID 4 | |
76 | ||
77 | static bool | |
78 | clean_username(const char *username) | |
79 | { | |
80 | int len = 0; | |
81 | ||
82 | for (; *username; username++) | |
83 | { | |
84 | len++; | |
85 | ||
86 | if(!IsUserChar(*username)) | |
87 | return false; | |
88 | } | |
89 | ||
90 | if(len > USERLEN) | |
91 | return false; | |
92 | ||
93 | return true; | |
94 | } | |
95 | ||
96 | static bool | |
97 | clean_host(const char *host) | |
98 | { | |
99 | int len = 0; | |
100 | ||
101 | for (; *host; host++) | |
102 | { | |
103 | len++; | |
104 | ||
105 | if(!IsHostChar(*host)) | |
106 | return false; | |
107 | } | |
108 | ||
109 | if(len > HOSTLEN) | |
110 | return false; | |
111 | ||
112 | return true; | |
113 | } | |
114 | ||
115 | static void | |
116 | me_svslogin(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, | |
117 | int parc, const char *parv[]) | |
118 | { | |
119 | struct Client *target_p, *exist_p; | |
120 | char nick[NICKLEN+1], login[NICKLEN+1]; | |
121 | char user[USERLEN+1], host[HOSTLEN+1]; | |
122 | int valid = 0; | |
123 | ||
124 | if(!(source_p->flags & FLAGS_SERVICE)) | |
125 | { | |
126 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
127 | "Non-service server %s attempting to execute services-only command SVSLOGIN", source_p->name); | |
128 | return; | |
129 | } | |
130 | ||
131 | if((target_p = find_client(parv[1])) == NULL) | |
132 | return; | |
133 | ||
134 | if(!MyClient(target_p) && !IsUnknown(target_p)) | |
135 | return; | |
136 | ||
137 | if(clean_nick(parv[2], 0)) | |
138 | { | |
139 | rb_strlcpy(nick, parv[2], NICKLEN + 1); | |
140 | valid |= NICK_VALID; | |
141 | } | |
142 | else if(*target_p->name) | |
143 | rb_strlcpy(nick, target_p->name, NICKLEN + 1); | |
144 | else | |
145 | strcpy(nick, "*"); | |
146 | ||
147 | if(clean_username(parv[3])) | |
148 | { | |
149 | rb_strlcpy(user, parv[3], USERLEN + 1); | |
150 | valid |= USER_VALID; | |
151 | } | |
152 | else | |
153 | rb_strlcpy(user, target_p->username, USERLEN + 1); | |
154 | ||
155 | if(clean_host(parv[4])) | |
156 | { | |
157 | rb_strlcpy(host, parv[4], HOSTLEN + 1); | |
158 | valid |= HOST_VALID; | |
159 | } | |
160 | else | |
161 | rb_strlcpy(host, target_p->host, HOSTLEN + 1); | |
162 | ||
163 | if(*parv[5] == '*') | |
164 | { | |
165 | if(target_p->user) | |
166 | rb_strlcpy(login, target_p->user->suser, NICKLEN + 1); | |
167 | else | |
168 | login[0] = '\0'; | |
169 | } | |
170 | else if(!strcmp(parv[5], "0")) | |
171 | login[0] = '\0'; | |
172 | else | |
173 | rb_strlcpy(login, parv[5], NICKLEN + 1); | |
174 | ||
175 | /* Login (mostly) follows nick rules. */ | |
176 | if(*login && !clean_nick(login, 0)) | |
177 | return; | |
178 | ||
179 | if((exist_p = find_person(nick)) && target_p != exist_p) | |
180 | { | |
181 | char buf[BUFSIZE]; | |
182 | ||
183 | if(MyClient(exist_p)) | |
184 | sendto_one(exist_p, ":%s KILL %s :(Nickname regained by services)", | |
185 | me.name, exist_p->name); | |
186 | ||
187 | exist_p->flags |= FLAGS_KILLED; | |
188 | kill_client_serv_butone(NULL, exist_p, "%s (Nickname regained by services)", | |
189 | me.name); | |
190 | sendto_realops_snomask(SNO_SKILL, L_ALL, | |
191 | "Nick collision due to SVSLOGIN on %s", | |
192 | nick); | |
193 | ||
194 | snprintf(buf, sizeof(buf), "Killed (%s (Nickname regained by services))", | |
195 | me.name); | |
196 | exit_client(NULL, exist_p, &me, buf); | |
197 | } | |
198 | else if((exist_p = find_client(nick)) && IsUnknown(exist_p) && exist_p != target_p) | |
199 | { | |
200 | exit_client(NULL, exist_p, &me, "Overridden"); | |
201 | } | |
202 | ||
203 | if(*login) | |
204 | { | |
205 | /* Strip leading digits, unless it's purely numeric. */ | |
206 | const char *p = login; | |
207 | while(IsDigit(*p)) | |
208 | p++; | |
209 | if(!*p) | |
210 | p = login; | |
211 | ||
212 | sendto_one(target_p, form_str(RPL_LOGGEDIN), me.name, EmptyString(target_p->name) ? "*" : target_p->name, | |
213 | nick, user, host, p, p); | |
214 | } | |
215 | else | |
216 | sendto_one(target_p, form_str(RPL_LOGGEDOUT), me.name, EmptyString(target_p->name) ? "*" : target_p->name, | |
217 | nick, user, host); | |
218 | ||
219 | if(IsUnknown(target_p)) | |
220 | { | |
221 | struct User *user_p = make_user(target_p); | |
222 | ||
223 | if(valid & NICK_VALID) | |
224 | rb_strlcpy(target_p->preClient->spoofnick, nick, sizeof(target_p->preClient->spoofnick)); | |
225 | ||
226 | if(valid & USER_VALID) | |
227 | rb_strlcpy(target_p->preClient->spoofuser, user, sizeof(target_p->preClient->spoofuser)); | |
228 | ||
229 | if(valid & HOST_VALID) | |
230 | rb_strlcpy(target_p->preClient->spoofhost, host, sizeof(target_p->preClient->spoofhost)); | |
231 | ||
232 | rb_strlcpy(user_p->suser, login, NICKLEN + 1); | |
233 | } | |
234 | else | |
235 | { | |
236 | char note[NAMELEN + 10]; | |
237 | ||
238 | send_signon(NULL, target_p, nick, user, host, rb_current_time(), login); | |
239 | ||
240 | snprintf(note, sizeof(note), "Nick: %s", target_p->name); | |
241 | rb_note(target_p->localClient->F, note); | |
242 | } | |
243 | } | |
244 | ||
245 | static void | |
246 | ms_signon(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, | |
247 | int parc, const char *parv[]) | |
248 | { | |
249 | struct Client *target_p; | |
250 | int newts, sameuser; | |
251 | char login[NICKLEN+1]; | |
252 | ||
253 | if(!clean_nick(parv[1], 0)) | |
254 | { | |
255 | ServerStats.is_kill++; | |
256 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
257 | "Bad Nick from SIGNON: %s From: %s(via %s)", | |
258 | parv[1], source_p->servptr->name, client_p->name); | |
259 | /* if source_p has an id, kill_client_serv_butone() will | |
260 | * send a kill to client_p, otherwise do it here */ | |
261 | if (!has_id(source_p)) | |
262 | sendto_one(client_p, ":%s KILL %s :%s (Bad nickname from SIGNON)", | |
263 | get_id(&me, client_p), parv[1], me.name); | |
264 | kill_client_serv_butone(client_p, source_p, "%s (Bad nickname from SIGNON)", | |
265 | me.name); | |
266 | source_p->flags |= FLAGS_KILLED; | |
267 | exit_client(NULL, source_p, &me, "Bad nickname from SIGNON"); | |
268 | return; | |
269 | } | |
270 | ||
271 | if(!clean_username(parv[2]) || !clean_host(parv[3])) | |
272 | { | |
273 | ServerStats.is_kill++; | |
274 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
275 | "Bad user@host from SIGNON: %s@%s From: %s(via %s)", | |
276 | parv[2], parv[3], source_p->servptr->name, client_p->name); | |
277 | /* if source_p has an id, kill_client_serv_butone() will | |
278 | * send a kill to client_p, otherwise do it here */ | |
279 | if (!has_id(source_p)) | |
280 | sendto_one(client_p, ":%s KILL %s :%s (Bad user@host from SIGNON)", | |
281 | get_id(&me, client_p), parv[1], me.name); | |
282 | kill_client_serv_butone(client_p, source_p, "%s (Bad user@host from SIGNON)", | |
283 | me.name); | |
284 | source_p->flags |= FLAGS_KILLED; | |
285 | exit_client(NULL, source_p, &me, "Bad user@host from SIGNON"); | |
286 | return; | |
287 | } | |
288 | ||
289 | newts = atol(parv[4]); | |
290 | ||
291 | if(!strcmp(parv[5], "0")) | |
292 | login[0] = '\0'; | |
293 | else if(*parv[5] != '*') | |
294 | { | |
295 | if (clean_nick(parv[5], 0)) | |
296 | rb_strlcpy(login, parv[5], NICKLEN + 1); | |
297 | else | |
298 | return; | |
299 | } | |
300 | else | |
301 | login[0] = '\0'; | |
302 | ||
303 | target_p = find_named_client(parv[1]); | |
304 | if(target_p != NULL && target_p != source_p) | |
305 | { | |
306 | /* In case of collision, follow NICK rules. */ | |
307 | /* XXX this is duplicated code and does not do SAVE */ | |
308 | if(IsUnknown(target_p)) | |
309 | exit_client(NULL, target_p, &me, "Overridden"); | |
310 | else | |
311 | { | |
312 | if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source_p->user) | |
313 | { | |
314 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
315 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(both killed)", | |
316 | source_p->name, target_p->name, target_p->from->name, | |
317 | client_p->name); | |
318 | ||
319 | ServerStats.is_kill++; | |
320 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
321 | form_str(ERR_NICKCOLLISION), target_p->name); | |
322 | ||
323 | kill_client_serv_butone(NULL, source_p, "%s (Nick change collision)", me.name); | |
324 | ||
325 | ServerStats.is_kill++; | |
326 | ||
327 | kill_client_serv_butone(NULL, target_p, "%s (Nick change collision)", me.name); | |
328 | ||
329 | target_p->flags |= FLAGS_KILLED; | |
330 | exit_client(NULL, target_p, &me, "Nick collision(new)"); | |
331 | source_p->flags |= FLAGS_KILLED; | |
332 | exit_client(client_p, source_p, &me, "Nick collision(old)"); | |
333 | return; | |
334 | } | |
335 | else | |
336 | { | |
337 | sameuser = !irccmp(target_p->username, source_p->username) && | |
338 | !irccmp(target_p->host, source_p->host); | |
339 | ||
340 | if((sameuser && newts < target_p->tsinfo) || | |
341 | (!sameuser && newts > target_p->tsinfo)) | |
342 | { | |
343 | if(sameuser) | |
344 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
345 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(older killed)", | |
346 | source_p->name, target_p->name, | |
347 | target_p->from->name, client_p->name); | |
348 | else | |
349 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
350 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(newer killed)", | |
351 | source_p->name, target_p->name, | |
352 | target_p->from->name, client_p->name); | |
353 | ||
354 | ServerStats.is_kill++; | |
355 | ||
356 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
357 | form_str(ERR_NICKCOLLISION), target_p->name); | |
358 | ||
359 | /* kill the client issuing the nickchange */ | |
360 | kill_client_serv_butone(client_p, source_p, | |
361 | "%s (Nick change collision)", me.name); | |
362 | ||
363 | source_p->flags |= FLAGS_KILLED; | |
364 | ||
365 | if(sameuser) | |
366 | exit_client(client_p, source_p, &me, "Nick collision(old)"); | |
367 | else | |
368 | exit_client(client_p, source_p, &me, "Nick collision(new)"); | |
369 | return; | |
370 | } | |
371 | else | |
372 | { | |
373 | if(sameuser) | |
374 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
375 | "Nick collision from SIGNON on %s(%s <- %s)(older killed)", | |
376 | target_p->name, target_p->from->name, | |
377 | client_p->name); | |
378 | else | |
379 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
380 | "Nick collision from SIGNON on %s(%s <- %s)(newer killed)", | |
381 | target_p->name, target_p->from->name, | |
382 | client_p->name); | |
383 | ||
384 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
385 | form_str(ERR_NICKCOLLISION), target_p->name); | |
386 | ||
387 | /* kill the client who existed before hand */ | |
388 | kill_client_serv_butone(client_p, target_p, | |
389 | "%s (Nick collision)", me.name); | |
390 | ||
391 | ServerStats.is_kill++; | |
392 | ||
393 | target_p->flags |= FLAGS_KILLED; | |
394 | (void) exit_client(client_p, target_p, &me, "Nick collision"); | |
395 | } | |
396 | } | |
397 | ||
398 | } | |
399 | } | |
400 | ||
401 | send_signon(client_p, source_p, parv[1], parv[2], parv[3], newts, login); | |
402 | } | |
403 | ||
404 | static void | |
405 | send_signon(struct Client *client_p, struct Client *target_p, | |
406 | const char *nick, const char *user, const char *host, | |
407 | unsigned int newts, const char *login) | |
408 | { | |
409 | sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s SIGNON %s %s %s %ld %s", | |
410 | use_id(target_p), nick, user, host, | |
411 | (long) target_p->tsinfo, *login ? login : "0"); | |
412 | ||
413 | rb_strlcpy(target_p->user->suser, login, sizeof(target_p->user->suser)); | |
414 | ||
415 | change_nick_user_host(target_p, nick, user, host, newts, "Signing %s (%s)", *login ? "in" : "out", nick); | |
416 | } |