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