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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 | * $Id: m_signon.c 1192 2006-04-21 16:21:02Z jilles $ | |
30 | */ | |
31 | ||
32 | #include "stdinc.h" | |
33 | ||
34 | #include "tools.h" | |
35 | #include "send.h" | |
36 | #include "channel.h" | |
37 | #include "client.h" | |
38 | #include "common.h" | |
39 | #include "config.h" | |
40 | #include "ircd.h" | |
41 | #include "numeric.h" | |
42 | #include "memory.h" | |
43 | #include "s_conf.h" | |
44 | #include "s_serv.h" | |
45 | #include "hash.h" | |
46 | #include "msg.h" | |
47 | #include "parse.h" | |
48 | #include "modules.h" | |
49 | #include "sprintf_irc.h" | |
50 | #include "whowas.h" | |
51 | #include "monitor.h" | |
52 | #include "s_stats.h" | |
53 | #include "snomask.h" | |
54 | #include "irc_string.h" | |
55 | #include "s_user.h" | |
56 | ||
57 | static int me_svslogin(struct Client *, struct Client *, int, const char **); | |
58 | static int ms_signon(struct Client *, struct Client *, int, const char **); | |
59 | ||
60 | static void send_signon(struct Client *, struct Client *, const char *, const char *, const char *, unsigned int, const char *); | |
61 | ||
62 | struct Message svslogin_msgtab = { | |
63 | "SVSLOGIN", 0, 0, 0, MFLG_SLOW, | |
64 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_svslogin, 6}, mg_ignore} | |
65 | }; | |
66 | struct Message signon_msgtab = { | |
67 | "SIGNON", 0, 0, 0, MFLG_SLOW, | |
68 | {mg_ignore, mg_ignore, {ms_signon, 6}, mg_ignore, mg_ignore, mg_ignore} | |
69 | }; | |
70 | ||
71 | mapi_clist_av1 signon_clist[] = { | |
72 | &svslogin_msgtab, &signon_msgtab, NULL | |
73 | }; | |
74 | ||
75 | DECLARE_MODULE_AV1(signon, NULL, NULL, signon_clist, NULL, NULL, "$Revision: 1192 $"); | |
76 | ||
77 | #define NICK_VALID 1 | |
78 | #define USER_VALID 2 | |
79 | #define HOST_VALID 4 | |
80 | ||
81 | static int | |
82 | clean_nick(const char *nick) | |
83 | { | |
84 | int len = 0; | |
85 | ||
86 | if(*nick == '-') | |
87 | return 0; | |
88 | ||
89 | /* This is used to check logins, which are often | |
90 | * numeric. Don't check for leading digits, if | |
91 | * services wants to set someone's nick to something | |
92 | * starting with a number, let it try. | |
93 | * --gxti | |
94 | */ | |
95 | ||
96 | for (; *nick; nick++) | |
97 | { | |
98 | len++; | |
99 | if(!IsNickChar(*nick)) | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* nicklen is +1 */ | |
104 | if(len >= NICKLEN) | |
105 | return 0; | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
110 | static int | |
111 | clean_username(const char *username) | |
112 | { | |
113 | int len = 0; | |
114 | ||
115 | for (; *username; username++) | |
116 | { | |
117 | len++; | |
118 | ||
119 | if(!IsUserChar(*username)) | |
120 | return 0; | |
121 | } | |
122 | ||
123 | if(len > USERLEN) | |
124 | return 0; | |
125 | ||
126 | return 1; | |
127 | } | |
128 | ||
129 | static int | |
130 | clean_host(const char *host) | |
131 | { | |
132 | int len = 0; | |
133 | ||
134 | for (; *host; host++) | |
135 | { | |
136 | len++; | |
137 | ||
138 | if(!IsHostChar(*host)) | |
139 | return 0; | |
140 | } | |
141 | ||
142 | if(len > HOSTLEN) | |
143 | return 0; | |
144 | ||
145 | return 1; | |
146 | } | |
147 | ||
148 | static int | |
149 | me_svslogin(struct Client *client_p, struct Client *source_p, | |
150 | int parc, const char *parv[]) | |
151 | { | |
152 | struct Client *target_p, *exist_p; | |
153 | char nick[NICKLEN+1], login[NICKLEN+1]; | |
154 | char user[USERLEN+1], host[HOSTLEN+1]; | |
155 | int valid = 0; | |
156 | ||
157 | if(!(source_p->flags & FLAGS_SERVICE)) | |
158 | return 0; | |
159 | ||
160 | if((target_p = find_client(parv[1])) == NULL) | |
161 | return 0; | |
162 | ||
163 | if(!MyClient(target_p) && !IsUnknown(target_p)) | |
164 | return 0; | |
165 | ||
166 | if(clean_nick(parv[2])) | |
167 | { | |
168 | strlcpy(nick, parv[2], NICKLEN + 1); | |
169 | valid |= NICK_VALID; | |
170 | } | |
171 | else if(*target_p->name) | |
172 | strlcpy(nick, target_p->name, NICKLEN + 1); | |
173 | else | |
174 | strcpy(nick, "*"); | |
175 | ||
176 | if(clean_username(parv[3])) | |
177 | { | |
178 | strlcpy(user, parv[3], USERLEN + 1); | |
179 | valid |= USER_VALID; | |
180 | } | |
181 | else | |
182 | strlcpy(user, target_p->username, USERLEN + 1); | |
183 | ||
184 | if(clean_host(parv[4])) | |
185 | { | |
186 | strlcpy(host, parv[4], HOSTLEN + 1); | |
187 | valid |= HOST_VALID; | |
188 | } | |
189 | else | |
190 | strlcpy(host, target_p->host, HOSTLEN + 1); | |
191 | ||
192 | if(*parv[5] == '*') | |
193 | { | |
194 | if(target_p->user) | |
195 | strlcpy(login, target_p->user->suser, NICKLEN + 1); | |
196 | else | |
197 | login[0] = '\0'; | |
198 | } | |
199 | else if(!strcmp(parv[5], "0")) | |
200 | login[0] = '\0'; | |
201 | else | |
202 | strlcpy(login, parv[5], NICKLEN + 1); | |
203 | ||
204 | /* Login (mostly) follows nick rules. */ | |
205 | if(*login && !clean_nick(login)) | |
206 | return 0; | |
207 | ||
208 | if((exist_p = find_person(nick)) && target_p != exist_p) | |
209 | { | |
210 | char buf[BUFSIZE]; | |
211 | ||
212 | if(MyClient(exist_p)) | |
213 | sendto_one(exist_p, ":%s KILL %s :(Nickname regained by services)", | |
214 | me.name, exist_p->name); | |
215 | ||
216 | exist_p->flags |= FLAGS_KILLED; | |
217 | kill_client_serv_butone(NULL, exist_p, "%s (Nickname regained by services)", | |
218 | me.name); | |
219 | ||
220 | snprintf(buf, sizeof(buf), "Killed (%s (Nickname regained by services))", | |
221 | me.name); | |
222 | exit_client(NULL, exist_p, &me, buf); | |
223 | }else if((exist_p = find_client(nick)) && IsUnknown(exist_p) && exist_p != target_p) { | |
224 | exit_client(NULL, exist_p, &me, "Overridden"); | |
225 | } | |
226 | ||
227 | if(*login) | |
228 | { | |
229 | /* Strip leading digits, unless it's purely numeric. */ | |
230 | const char *p = login; | |
231 | while(IsDigit(*p)) | |
232 | p++; | |
233 | if(!*p) | |
234 | p = login; | |
235 | ||
236 | sendto_one(target_p, form_str(RPL_LOGGEDIN), me.name, EmptyString(target_p->name) ? "*" : target_p->name, | |
237 | nick, user, host, p, p); | |
238 | } | |
239 | else | |
240 | sendto_one(target_p, form_str(RPL_LOGGEDOUT), me.name, EmptyString(target_p->name) ? "*" : target_p->name, | |
241 | nick, user, host); | |
242 | ||
243 | if(IsUnknown(target_p)) | |
244 | { | |
245 | struct User *user_p = make_user(target_p); | |
246 | ||
247 | if(valid & NICK_VALID) | |
248 | strcpy(target_p->preClient->spoofnick, nick); | |
249 | ||
250 | if(valid & USER_VALID) | |
251 | strcpy(target_p->preClient->spoofuser, user); | |
252 | ||
253 | if(valid & HOST_VALID) | |
254 | strcpy(target_p->preClient->spoofhost, host); | |
255 | ||
256 | strlcpy(user_p->suser, login, NICKLEN + 1); | |
257 | } | |
258 | else | |
259 | { | |
260 | send_signon(NULL, target_p, nick, user, host, CurrentTime, login); | |
261 | comm_note(target_p->localClient->fd, "Nick: %s", target_p->name); | |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int | |
268 | ms_signon(struct Client *client_p, struct Client *source_p, | |
269 | int parc, const char *parv[]) | |
270 | { | |
271 | struct Client *target_p; | |
272 | int newts, sameuser; | |
273 | char login[NICKLEN+1]; | |
274 | ||
275 | if(!clean_nick(parv[1])) | |
276 | { | |
277 | ServerStats->is_kill++; | |
278 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
279 | "Bad Nick from SIGNON: %s From: %s(via %s)", | |
280 | parv[1], source_p->servptr->name, client_p->name); | |
281 | /* if source_p has an id, kill_client_serv_butone() will | |
282 | * send a kill to client_p, otherwise do it here */ | |
283 | if (!has_id(source_p)) | |
284 | sendto_one(client_p, ":%s KILL %s :%s (Bad nickname from SIGNON)", | |
285 | get_id(&me, client_p), parv[1], me.name); | |
286 | kill_client_serv_butone(client_p, source_p, "%s (Bad nickname from SIGNON)", | |
287 | me.name); | |
288 | source_p->flags |= FLAGS_KILLED; | |
289 | exit_client(NULL, source_p, &me, "Bad nickname from SIGNON"); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | if(!clean_username(parv[2]) || !clean_host(parv[3])) | |
294 | { | |
295 | ServerStats->is_kill++; | |
296 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
297 | "Bad user@host from SIGNON: %s@%s From: %s(via %s)", | |
298 | parv[2], parv[3], source_p->servptr->name, client_p->name); | |
299 | /* if source_p has an id, kill_client_serv_butone() will | |
300 | * send a kill to client_p, otherwise do it here */ | |
301 | if (!has_id(source_p)) | |
302 | sendto_one(client_p, ":%s KILL %s :%s (Bad user@host from SIGNON)", | |
303 | get_id(&me, client_p), parv[1], me.name); | |
304 | kill_client_serv_butone(client_p, source_p, "%s (Bad user@host from SIGNON)", | |
305 | me.name); | |
306 | source_p->flags |= FLAGS_KILLED; | |
307 | exit_client(NULL, source_p, &me, "Bad user@host from SIGNON"); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | newts = atol(parv[4]); | |
312 | ||
313 | if(!strcmp(parv[5], "0")) | |
314 | login[0] = '\0'; | |
315 | else if(*parv[5] != '*') | |
316 | { | |
317 | if (clean_nick(parv[5])) | |
318 | strlcpy(login, parv[5], NICKLEN + 1); | |
319 | else | |
320 | return 0; | |
321 | } | |
322 | ||
323 | target_p = find_named_client(parv[1]); | |
324 | if(target_p != NULL && target_p != source_p) | |
325 | { | |
326 | /* In case of collision, follow NICK rules. */ | |
327 | /* XXX this is duplicated code and does not do SAVE */ | |
328 | if(IsUnknown(target_p)) | |
329 | exit_client(NULL, target_p, &me, "Overridden"); | |
330 | else | |
331 | { | |
332 | if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source_p->user) | |
333 | { | |
334 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
335 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(both killed)", | |
336 | source_p->name, target_p->name, target_p->from->name, | |
337 | client_p->name); | |
338 | ||
339 | ServerStats->is_kill++; | |
340 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
341 | form_str(ERR_NICKCOLLISION), target_p->name); | |
342 | ||
343 | kill_client_serv_butone(NULL, source_p, "%s (Nick change collision)", me.name); | |
344 | ||
345 | ServerStats->is_kill++; | |
346 | ||
347 | kill_client_serv_butone(NULL, target_p, "%s (Nick change collision)", me.name); | |
348 | ||
349 | target_p->flags |= FLAGS_KILLED; | |
350 | exit_client(NULL, target_p, &me, "Nick collision(new)"); | |
351 | source_p->flags |= FLAGS_KILLED; | |
352 | exit_client(client_p, source_p, &me, "Nick collision(old)"); | |
353 | return 0; | |
354 | } | |
355 | else | |
356 | { | |
357 | sameuser = !irccmp(target_p->username, source_p->username) && | |
358 | !irccmp(target_p->host, source_p->host); | |
359 | ||
360 | if((sameuser && newts < target_p->tsinfo) || | |
361 | (!sameuser && newts > target_p->tsinfo)) | |
362 | { | |
363 | if(sameuser) | |
364 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
365 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(older killed)", | |
366 | source_p->name, target_p->name, | |
367 | target_p->from->name, client_p->name); | |
368 | else | |
369 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
370 | "Nick change collision from SIGNON from %s to %s(%s <- %s)(newer killed)", | |
371 | source_p->name, target_p->name, | |
372 | target_p->from->name, client_p->name); | |
373 | ||
374 | ServerStats->is_kill++; | |
375 | ||
376 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
377 | form_str(ERR_NICKCOLLISION), target_p->name); | |
378 | ||
379 | /* kill the client issuing the nickchange */ | |
380 | kill_client_serv_butone(client_p, source_p, | |
381 | "%s (Nick change collision)", me.name); | |
382 | ||
383 | source_p->flags |= FLAGS_KILLED; | |
384 | ||
385 | if(sameuser) | |
386 | exit_client(client_p, source_p, &me, "Nick collision(old)"); | |
387 | else | |
388 | exit_client(client_p, source_p, &me, "Nick collision(new)"); | |
389 | return 0; | |
390 | } | |
391 | else | |
392 | { | |
393 | if(sameuser) | |
394 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
395 | "Nick collision from SIGNON on %s(%s <- %s)(older killed)", | |
396 | target_p->name, target_p->from->name, | |
397 | client_p->name); | |
398 | else | |
399 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
400 | "Nick collision from SIGNON on %s(%s <- %s)(newer killed)", | |
401 | target_p->name, target_p->from->name, | |
402 | client_p->name); | |
403 | ||
404 | sendto_one_numeric(target_p, ERR_NICKCOLLISION, | |
405 | form_str(ERR_NICKCOLLISION), target_p->name); | |
406 | ||
407 | /* kill the client who existed before hand */ | |
408 | kill_client_serv_butone(client_p, target_p, | |
409 | "%s (Nick collision)", me.name); | |
410 | ||
411 | ServerStats->is_kill++; | |
412 | ||
413 | target_p->flags |= FLAGS_KILLED; | |
414 | (void) exit_client(client_p, target_p, &me, "Nick collision"); | |
415 | } | |
416 | } | |
417 | ||
418 | } | |
419 | } | |
420 | ||
421 | send_signon(client_p, source_p, parv[1], parv[2], parv[3], newts, login); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static void | |
426 | send_signon(struct Client *client_p, struct Client *target_p, | |
427 | const char *nick, const char *user, const char *host, | |
428 | unsigned int newts, const char *login) | |
429 | { | |
430 | sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s SIGNON %s %s %s %ld %s", | |
431 | use_id(target_p), nick, user, host, | |
432 | (long) target_p->tsinfo, *login ? login : "0"); | |
433 | sendto_server(client_p, NULL, NOCAPS, CAP_TS6, ":%s SIGNON %s %s %s %ld %s", | |
434 | target_p->name, nick, user, host, | |
435 | (long) target_p->tsinfo, *login ? login : "0"); | |
436 | ||
437 | strcpy(target_p->user->suser, login); | |
438 | ||
439 | change_nick_user_host(target_p, nick, user, host, newts, "Signing %s (%s)", *login ? "in" : "out", nick); | |
440 | } | |
441 |