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 "defaults.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 const char signon_desc[] = "Provides account login/logout support for services";
  53
  54 static void me_svslogin(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  55 static void ms_signon(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  56
  57 static void send_signon(struct Client *, struct Client *, const char *, const char *, const char *, unsigned int, const char *);
  58
  59 struct Message svslogin_msgtab = {
  60         "SVSLOGIN", 0, 0, 0, 0,
  61         {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_svslogin, 6}, mg_ignore}
  62 };
  63 struct Message signon_msgtab = {
  64         "SIGNON", 0, 0, 0, 0,
  65         {mg_ignore, mg_ignore, {ms_signon, 6}, mg_ignore, mg_ignore, mg_ignore}
  66 };
  67
  68 mapi_clist_av1 signon_clist[] = {
  69         &svslogin_msgtab, &signon_msgtab, NULL
  70 };
  71
  72 DECLARE_MODULE_AV2(signon, NULL, NULL, signon_clist, NULL, NULL, NULL, NULL, signon_desc);
  73
  74 #define NICK_VALID      1
  75 #define USER_VALID      2
  76 #define HOST_VALID      4
  77
  78 static bool
  79 clean_username(const char *username)
  80 {
  81         int len = 0;
  82
  83         for (; *username; username++)
  84         {
  85                 len++;
  86
  87                 if(!IsUserChar(*username))
  88                         return false;
  89         }
  90
  91         if(len > USERLEN)
  92                 return false;
  93
  94         return true;
  95 }
  96
  97 static bool
  98 clean_host(const char *host)
  99 {
 100         int len = 0;
 101
 102         for (; *host; host++)
 103         {
 104                 len++;
 105
 106                 if(!IsHostChar(*host))
 107                         return false;
 108         }
 109
 110         if(len > HOSTLEN)
 111                 return false;
 112
 113         return true;
 114 }
 115
 116 static void
 117 me_svslogin(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
 118         int parc, const char *parv[])
 119 {
 120         struct Client *target_p, *exist_p;
 121         char nick[NICKLEN+1], login[NICKLEN+1];
 122         char user[USERLEN+1], host[HOSTLEN+1];
 123         int valid = 0;
 124
 125         if(!(source_p->flags & FLAGS_SERVICE))
 126         {
 127                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 128                         "Non-service server %s attempting to execute services-only command SVSLOGIN", source_p->name);
 129                 return;
 130         }
 131
 132         if((target_p = find_client(parv[1])) == NULL)
 133                 return;
 134
 135         if(!MyClient(target_p) && !IsUnknown(target_p))
 136                 return;
 137
 138         if(clean_nick(parv[2], 0))
 139         {
 140                 rb_strlcpy(nick, parv[2], NICKLEN + 1);
 141                 valid |= NICK_VALID;
 142         }
 143         else if(*target_p->name)
 144                 rb_strlcpy(nick, target_p->name, NICKLEN + 1);
 145         else
 146                 strcpy(nick, "*");
 147
 148         if(clean_username(parv[3]))
 149         {
 150                 rb_strlcpy(user, parv[3], USERLEN + 1);
 151                 valid |= USER_VALID;
 152         }
 153         else
 154                 rb_strlcpy(user, target_p->username, USERLEN + 1);
 155
 156         if(clean_host(parv[4]))
 157         {
 158                 rb_strlcpy(host, parv[4], HOSTLEN + 1);
 159                 valid |= HOST_VALID;
 160         }
 161         else
 162                 rb_strlcpy(host, target_p->host, HOSTLEN + 1);
 163
 164         if(*parv[5] == '*')
 165         {
 166                 if(target_p->user)
 167                         rb_strlcpy(login, target_p->user->suser, NICKLEN + 1);
 168                 else
 169                         login[0] = '\0';
 170         }
 171         else if(!strcmp(parv[5], "0"))
 172                 login[0] = '\0';
 173         else
 174                 rb_strlcpy(login, parv[5], NICKLEN + 1);
 175
 176         /* Login (mostly) follows nick rules. */
 177         if(*login && !clean_nick(login, 0))
 178                 return;
 179
 180         if((exist_p = find_person(nick)) && target_p != exist_p)
 181         {
 182                 char buf[BUFSIZE];
 183
 184                 if(MyClient(exist_p))
 185                         sendto_one(exist_p, ":%s KILL %s :(Nickname regained by services)",
 186                                 me.name, exist_p->name);
 187
 188                 exist_p->flags |= FLAGS_KILLED;
 189                 kill_client_serv_butone(NULL, exist_p, "%s (Nickname regained by services)",
 190                                         me.name);
 191                 sendto_realops_snomask(SNO_SKILL, L_ALL,
 192                                 "Nick collision due to SVSLOGIN on %s",
 193                                 nick);
 194
 195                 snprintf(buf, sizeof(buf), "Killed (%s (Nickname regained by services))",
 196                         me.name);
 197                 exit_client(NULL, exist_p, &me, buf);
 198         }
 199         else if((exist_p = find_client(nick)) && IsUnknown(exist_p) && exist_p != target_p)
 200         {
 201                 exit_client(NULL, exist_p, &me, "Overridden");
 202         }
 203
 204         if(*login)
 205         {
 206                 /* Strip leading digits, unless it's purely numeric. */
 207                 const char *p = login;
 208                 while(IsDigit(*p))
 209                         p++;
 210                 if(!*p)
 211                         p = login;
 212
 213                 sendto_one(target_p, form_str(RPL_LOGGEDIN), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
 214                                 nick, user, host, p, p);
 215         }
 216         else
 217                 sendto_one(target_p, form_str(RPL_LOGGEDOUT), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
 218                                 nick, user, host);
 219
 220         if(IsUnknown(target_p))
 221         {
 222                 struct User *user_p = make_user(target_p);
 223
 224                 if(valid & NICK_VALID)
 225                         strcpy(target_p->preClient->spoofnick, nick);
 226
 227                 if(valid & USER_VALID)
 228                         strcpy(target_p->preClient->spoofuser, user);
 229
 230                 if(valid & HOST_VALID)
 231                         strcpy(target_p->preClient->spoofhost, host);
 232
 233                 rb_strlcpy(user_p->suser, login, NICKLEN + 1);
 234         }
 235         else
 236         {
 237                 char note[NICKLEN + 10];
 238
 239                 send_signon(NULL, target_p, nick, user, host, rb_current_time(), login);
 240
 241                 snprintf(note, NICKLEN + 10, "Nick: %s", target_p->name);
 242                 rb_note(target_p->localClient->F, note);
 243         }
 244 }
 245
 246 static void
 247 ms_signon(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
 248         int parc, const char *parv[])
 249 {
 250         struct Client *target_p;
 251         int newts, sameuser;
 252         char login[NICKLEN+1];
 253
 254         if(!clean_nick(parv[1], 0))
 255         {
 256                 ServerStats.is_kill++;
 257                 sendto_realops_snomask(SNO_DEBUG, L_ALL,
 258                                 "Bad Nick from SIGNON: %s From: %s(via %s)",
 259                                 parv[1], source_p->servptr->name, client_p->name);
 260                 /* if source_p has an id, kill_client_serv_butone() will
 261                  * send a kill to client_p, otherwise do it here */
 262                 if (!has_id(source_p))
 263                         sendto_one(client_p, ":%s KILL %s :%s (Bad nickname from SIGNON)",
 264                                 get_id(&me, client_p), parv[1], me.name);
 265                 kill_client_serv_butone(client_p, source_p, "%s (Bad nickname from SIGNON)",
 266                                 me.name);
 267                 source_p->flags |= FLAGS_KILLED;
 268                 exit_client(NULL, source_p, &me, "Bad nickname from SIGNON");
 269                 return;
 270         }
 271
 272         if(!clean_username(parv[2]) || !clean_host(parv[3]))
 273         {
 274                 ServerStats.is_kill++;
 275                 sendto_realops_snomask(SNO_DEBUG, L_ALL,
 276                                 "Bad user@host from SIGNON: %s@%s From: %s(via %s)",
 277                                 parv[2], parv[3], source_p->servptr->name, client_p->name);
 278                 /* if source_p has an id, kill_client_serv_butone() will
 279                  * send a kill to client_p, otherwise do it here */
 280                 if (!has_id(source_p))
 281                         sendto_one(client_p, ":%s KILL %s :%s (Bad user@host from SIGNON)",
 282                                 get_id(&me, client_p), parv[1], me.name);
 283                 kill_client_serv_butone(client_p, source_p, "%s (Bad user@host from SIGNON)",
 284                                 me.name);
 285                 source_p->flags |= FLAGS_KILLED;
 286                 exit_client(NULL, source_p, &me, "Bad user@host from SIGNON");
 287                 return;
 288         }
 289
 290         newts = atol(parv[4]);
 291
 292         if(!strcmp(parv[5], "0"))
 293                 login[0] = '\0';
 294         else if(*parv[5] != '*')
 295         {
 296                 if (clean_nick(parv[5], 0))
 297                         rb_strlcpy(login, parv[5], NICKLEN + 1);
 298                 else
 299                         return;
 300         }
 301         else
 302                 login[0] = '\0';
 303
 304         target_p = find_named_client(parv[1]);
 305         if(target_p != NULL && target_p != source_p)
 306         {
 307                 /* In case of collision, follow NICK rules. */
 308                 /* XXX this is duplicated code and does not do SAVE */
 309                 if(IsUnknown(target_p))
 310                         exit_client(NULL, target_p, &me, "Overridden");
 311                 else
 312                 {
 313                         if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source_p->user)
 314                         {
 315                                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 316                                                      "Nick change collision from SIGNON from %s to %s(%s <- %s)(both killed)",
 317                                                      source_p->name, target_p->name, target_p->from->name,
 318                                                      client_p->name);
 319
 320                                 ServerStats.is_kill++;
 321                                 sendto_one_numeric(target_p, ERR_NICKCOLLISION,
 322                                                    form_str(ERR_NICKCOLLISION), target_p->name);
 323
 324                                 kill_client_serv_butone(NULL, source_p, "%s (Nick change collision)", me.name);
 325
 326                                 ServerStats.is_kill++;
 327
 328                                 kill_client_serv_butone(NULL, target_p, "%s (Nick change collision)", me.name);
 329
 330                                 target_p->flags |= FLAGS_KILLED;
 331                                 exit_client(NULL, target_p, &me, "Nick collision(new)");
 332                                 source_p->flags |= FLAGS_KILLED;
 333                                 exit_client(client_p, source_p, &me, "Nick collision(old)");
 334                                 return;
 335                         }
 336                         else
 337                         {
 338                                 sameuser = !irccmp(target_p->username, source_p->username) &&
 339                                         !irccmp(target_p->host, source_p->host);
 340
 341                                 if((sameuser && newts < target_p->tsinfo) ||
 342                                    (!sameuser && newts > target_p->tsinfo))
 343                                 {
 344                                         if(sameuser)
 345                                                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 346                                                                      "Nick change collision from SIGNON from %s to %s(%s <- %s)(older killed)",
 347                                                                      source_p->name, target_p->name,
 348                                                                      target_p->from->name, client_p->name);
 349                                         else
 350                                                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 351                                                                      "Nick change collision from SIGNON from %s to %s(%s <- %s)(newer killed)",
 352                                                                      source_p->name, target_p->name,
 353                                                                      target_p->from->name, client_p->name);
 354
 355                                         ServerStats.is_kill++;
 356
 357                                         sendto_one_numeric(target_p, ERR_NICKCOLLISION,
 358                                                            form_str(ERR_NICKCOLLISION), target_p->name);
 359
 360                                         /* kill the client issuing the nickchange */
 361                                         kill_client_serv_butone(client_p, source_p,
 362                                                                 "%s (Nick change collision)", me.name);
 363
 364                                         source_p->flags |= FLAGS_KILLED;
 365
 366                                         if(sameuser)
 367                                                 exit_client(client_p, source_p, &me, "Nick collision(old)");
 368                                         else
 369                                                 exit_client(client_p, source_p, &me, "Nick collision(new)");
 370                                         return;
 371                                 }
 372                                 else
 373                                 {
 374                                         if(sameuser)
 375                                                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 376                                                                      "Nick collision from SIGNON on %s(%s <- %s)(older killed)",
 377                                                                      target_p->name, target_p->from->name,
 378                                                                      client_p->name);
 379                                         else
 380                                                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 381                                                                      "Nick collision from SIGNON on %s(%s <- %s)(newer killed)",
 382                                                                      target_p->name, target_p->from->name,
 383                                                                      client_p->name);
 384
 385                                         sendto_one_numeric(target_p, ERR_NICKCOLLISION,
 386                                                            form_str(ERR_NICKCOLLISION), target_p->name);
 387
 388                                         /* kill the client who existed before hand */
 389                                         kill_client_serv_butone(client_p, target_p,
 390                                                         "%s (Nick collision)", me.name);
 391
 392                                         ServerStats.is_kill++;
 393
 394                                         target_p->flags |= FLAGS_KILLED;
 395                                         (void) exit_client(client_p, target_p, &me, "Nick collision");
 396                                 }
 397                         }
 398
 399                 }
 400         }
 401
 402         send_signon(client_p, source_p, parv[1], parv[2], parv[3], newts, login);
 403 }
 404
 405 static void
 406 send_signon(struct Client *client_p, struct Client *target_p,
 407                 const char *nick, const char *user, const char *host,
 408                 unsigned int newts, const char *login)
 409 {
 410         sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s SIGNON %s %s %s %ld %s",
 411                         use_id(target_p), nick, user, host,
 412                         (long) target_p->tsinfo, *login ? login : "0");
 413
 414         strcpy(target_p->user->suser, login);
 415
 416         change_nick_user_host(target_p, nick, user, host, newts, "Signing %s (%s)", *login ?  "in" : "out", nick);
 417 }