modules/m_signon.c

   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
  31 #include "stdinc.h"
  32
  33 #include "send.h"
  34 #include "channel.h"
  35 #include "client.h"
  36 #include "common.h"
  37 #include "config.h"
  38 #include "ircd.h"
  39 #include "numeric.h"
  40 #include "s_conf.h"
  41 #include "s_serv.h"
  42 #include "hash.h"
  43 #include "msg.h"
  44 #include "parse.h"
  45 #include "modules.h"
  46 #include "whowas.h"
  47 #include "monitor.h"
  48 #include "s_stats.h"
  49 #include "snomask.h"
  50 #include "match.h"
  51 #include "s_user.h"
  52
  53 static int me_svslogin(struct Client *, struct Client *, int, const char **);
  54 static int ms_signon(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, MFLG_SLOW,
  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, MFLG_SLOW,
  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_AV1(signon, NULL, NULL, signon_clist, NULL, NULL, "$Revision: 1192 $");
  72
  73 #define NICK_VALID      1
  74 #define USER_VALID      2
  75 #define HOST_VALID      4
  76
  77 static int
  78 clean_nick(const char *nick)
  79 {
  80         int len = 0;
  81
  82         if(*nick == '-')
  83                 return 0;
  84
  85         /* This is used to check logins, which are often
  86          * numeric. Don't check for leading digits, if
  87          * services wants to set someone's nick to something
  88          * starting with a number, let it try.
  89          * --gxti
  90          */
  91
  92         for (; *nick; nick++)
  93         {
  94                 len++;
  95                 if(!IsNickChar(*nick))
  96                         return 0;
  97         }
  98
  99         /* nicklen is +1 */
 100         if(len >= NICKLEN)
 101                 return 0;
 102
 103         return 1;
 104 }
 105
 106 static int
 107 clean_username(const char *username)
 108 {
 109         int len = 0;
 110
 111         for (; *username; username++)
 112         {
 113                 len++;
 114
 115                 if(!IsUserChar(*username))
 116                         return 0;
 117         }
 118
 119         if(len > USERLEN)
 120                 return 0;
 121
 122         return 1;
 123 }
 124
 125 static int
 126 clean_host(const char *host)
 127 {
 128         int len = 0;
 129
 130         for (; *host; host++)
 131         {
 132                 len++;
 133
 134                 if(!IsHostChar(*host))
 135                         return 0;
 136         }
 137
 138         if(len > HOSTLEN)
 139                 return 0;
 140
 141         return 1;
 142 }
 143
 144 static int
 145 me_svslogin(struct Client *client_p, struct Client *source_p,
 146         int parc, const char *parv[])
 147 {
 148         struct Client *target_p, *exist_p;
 149         char nick[NICKLEN+1], login[NICKLEN+1];
 150         char user[USERLEN+1], host[HOSTLEN+1];
 151         int valid = 0;
 152
 153         if(!(source_p->flags & FLAGS_SERVICE))
 154                 return 0;
 155
 156         if((target_p = find_client(parv[1])) == NULL)
 157                 return 0;
 158
 159         if(!MyClient(target_p) && !IsUnknown(target_p))
 160                 return 0;
 161
 162         if(clean_nick(parv[2]))
 163         {
 164                 rb_strlcpy(nick, parv[2], NICKLEN + 1);
 165                 valid |= NICK_VALID;
 166         }
 167         else if(*target_p->name)
 168                 rb_strlcpy(nick, target_p->name, NICKLEN + 1);
 169         else
 170                 strcpy(nick, "*");
 171
 172         if(clean_username(parv[3]))
 173         {
 174                 rb_strlcpy(user, parv[3], USERLEN + 1);
 175                 valid |= USER_VALID;
 176         }
 177         else
 178                 rb_strlcpy(user, target_p->username, USERLEN + 1);
 179
 180         if(clean_host(parv[4]))
 181         {
 182                 rb_strlcpy(host, parv[4], HOSTLEN + 1);
 183                 valid |= HOST_VALID;
 184         }
 185         else
 186                 rb_strlcpy(host, target_p->host, HOSTLEN + 1);
 187
 188         if(*parv[5] == '*')
 189         {
 190                 if(target_p->user)
 191                         rb_strlcpy(login, target_p->user->suser, NICKLEN + 1);
 192                 else
 193                         login[0] = '\0';
 194         }
 195         else if(!strcmp(parv[5], "0"))
 196                 login[0] = '\0';
 197         else
 198                 rb_strlcpy(login, parv[5], NICKLEN + 1);
 199
 200         /* Login (mostly) follows nick rules. */
 201         if(*login && !clean_nick(login))
 202                 return 0;
 203
 204         if((exist_p = find_person(nick)) && target_p != exist_p)
 205         {
 206                 char buf[BUFSIZE];
 207
 208                 if(MyClient(exist_p))
 209                         sendto_one(exist_p, ":%s KILL %s :(Nickname regained by services)",
 210                                 me.name, exist_p->name);
 211
 212                 exist_p->flags |= FLAGS_KILLED;
 213                 kill_client_serv_butone(NULL, exist_p, "%s (Nickname regained by services)",
 214                                         me.name);
 215
 216                 rb_snprintf(buf, sizeof(buf), "Killed (%s (Nickname regained by services))",
 217                         me.name);
 218                 exit_client(NULL, exist_p, &me, buf);
 219         }else if((exist_p = find_client(nick)) && IsUnknown(exist_p) && exist_p != target_p) {
 220                 exit_client(NULL, exist_p, &me, "Overridden");
 221         }
 222
 223         if(*login)
 224         {
 225                 /* Strip leading digits, unless it's purely numeric. */
 226                 const char *p = login;
 227                 while(IsDigit(*p))
 228                         p++;
 229                 if(!*p)
 230                         p = login;
 231
 232                 sendto_one(target_p, form_str(RPL_LOGGEDIN), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
 233                                 nick, user, host, p, p);
 234         }
 235         else
 236                 sendto_one(target_p, form_str(RPL_LOGGEDOUT), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
 237                                 nick, user, host);
 238
 239         if(IsUnknown(target_p))
 240         {
 241                 struct User *user_p = make_user(target_p);
 242
 243                 if(valid & NICK_VALID)
 244                         strcpy(target_p->preClient->spoofnick, nick);
 245
 246                 if(valid & USER_VALID)
 247                         strcpy(target_p->preClient->spoofuser, user);
 248
 249                 if(valid & HOST_VALID)
 250                         strcpy(target_p->preClient->spoofhost, host);
 251
 252                 rb_strlcpy(user_p->suser, login, NICKLEN + 1);
 253         }
 254         else
 255         {
 256                 char note[NICKLEN + 10];
 257
 258                 send_signon(NULL, target_p, nick, user, host, rb_current_time(), login);
 259
 260                 rb_snprintf(note, NICKLEN + 10, "Nick: %s", target_p->name);
 261                 rb_note(target_p->localClient->F, note);
 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                         rb_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
 434         strcpy(target_p->user->suser, login);
 435
 436         change_nick_user_host(target_p, nick, user, host, newts, "Signing %s (%s)", *login ?  "in" : "out", nick);
 437 }
 438