src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  *
  11  * Login and logout
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 #include "imp.h"
  18 #include <assert.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <strings.h>
  23 #include <signal.h>
  24 #include <unistd.h>
  25
  26 #include "ngircd.h"
  27 #include "conn-func.h"
  28 #include "conf.h"
  29 #include "channel.h"
  30 #include "io.h"
  31 #include "log.h"
  32 #include "messages.h"
  33 #include "pam.h"
  34 #include "parse.h"
  35 #include "irc.h"
  36 #include "irc-info.h"
  37 #include "irc-write.h"
  38
  39 #include "exp.h"
  40 #include "irc-login.h"
  41
  42
  43 static bool Hello_User PARAMS(( CLIENT *Client ));
  44 static bool Hello_User_PostAuth PARAMS(( CLIENT *Client ));
  45 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
  46 static void Introduce_Client PARAMS((CLIENT *To, CLIENT *Client, int Type));
  47 static void Reject_Client PARAMS((CLIENT *Client));
  48
  49 static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
  50                                        void *i));
  51
  52 #ifdef PAM
  53 static void cb_Read_Auth_Result PARAMS((int r_fd, UNUSED short events));
  54 #endif
  55
  56 /**
  57  * Handler for the IRC command "PASS".
  58  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  59  */
  60 GLOBAL bool
  61 IRC_PASS( CLIENT *Client, REQUEST *Req )
  62 {
  63         char *type, *orig_flags;
  64         int protohigh, protolow;
  65
  66         assert( Client != NULL );
  67         assert( Req != NULL );
  68
  69         /* Return an error if this is not a local client */
  70         if (Client_Conn(Client) <= NONE)
  71                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  72                                           Client_ID(Client), Req->command);
  73
  74         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  75                 /* Not yet registered "unknown" connection, PASS with one
  76                  * argument: either a regular client, service, or server
  77                  * using the old RFC 1459 section 4.1.1 syntax. */
  78                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  79                          Client_Conn(Client));
  80         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  81                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  82                    (Req->argc == 3 || Req->argc == 4)) {
  83                 /* Not yet registered "unknown" connection or outgoing server
  84                  * link, PASS with three or four argument: server using the
  85                  * RFC 2813 section 4.1.1 syntax. */
  86                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  87                          Client_Conn(Client));
  88         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  89                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  90                 /* Unregistered connection, but wrong number of arguments: */
  91                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  92                                           Client_ID(Client), Req->command);
  93         } else {
  94                 /* Registered connection, PASS command is not allowed! */
  95                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
  96                                           Client_ID(Client));
  97         }
  98
  99         Client_SetPassword(Client, Req->argv[0]);
 100
 101         /* Protocol version */
 102         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
 103                 int c2, c4;
 104
 105                 c2 = Req->argv[1][2];
 106                 c4 = Req->argv[1][4];
 107
 108                 Req->argv[1][4] = '\0';
 109                 protolow = atoi(&Req->argv[1][2]);
 110                 Req->argv[1][2] = '\0';
 111                 protohigh = atoi(Req->argv[1]);
 112
 113                 Req->argv[1][2] = c2;
 114                 Req->argv[1][4] = c4;
 115
 116                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 117         } else {
 118                 protohigh = protolow = 0;
 119                 Client_SetType(Client, CLIENT_GOTPASS);
 120         }
 121
 122         /* Protocol type, see doc/Protocol.txt */
 123         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 124                 type = &Req->argv[1][4];
 125         else
 126                 type = NULL;
 127
 128         /* Protocol flags/options */
 129         if (Req->argc >= 4)
 130                 orig_flags = Req->argv[3];
 131         else
 132                 orig_flags = "";
 133
 134         /* Implementation, version and IRC+ flags */
 135         if (Req->argc >= 3) {
 136                 char *impl, *ptr, *serverver, *flags;
 137
 138                 impl = Req->argv[2];
 139                 ptr = strchr(impl, '|');
 140                 if (ptr)
 141                         *ptr = '\0';
 142
 143                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 144                         /* The peer seems to be a server which supports the
 145                          * IRC+ protocol (see doc/Protocol.txt). */
 146                         serverver = ptr + 1;
 147                         flags = strchr(serverver, ':');
 148                         if (flags) {
 149                                 *flags = '\0';
 150                                 flags++;
 151                         } else
 152                                 flags = "";
 153                         Log(LOG_INFO,
 154                             "Peer announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 155                             impl, serverver, protohigh, protolow, flags);
 156                 } else {
 157                         /* The peer seems to be a server supporting the
 158                          * "original" IRC protocol (RFC 2813). */
 159                         if (strchr(orig_flags, 'Z'))
 160                                 flags = "Z";
 161                         else
 162                                 flags = "";
 163                         Log(LOG_INFO,
 164                             "Peer announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 165                             impl, protohigh, protolow, flags);
 166                 }
 167                 Client_SetFlags(Client, flags);
 168         }
 169
 170         return CONNECTED;
 171 } /* IRC_PASS */
 172
 173
 174 /**
 175  * IRC "NICK" command.
 176  * This function implements the IRC command "NICK" which is used to register
 177  * with the server, to change already registered nicknames and to introduce
 178  * new users which are connected to other servers.
 179  */
 180 GLOBAL bool
 181 IRC_NICK( CLIENT *Client, REQUEST *Req )
 182 {
 183         CLIENT *intr_c, *target, *c;
 184         char *nick, *user, *hostname, *modes, *info;
 185         int token, hops;
 186
 187         assert( Client != NULL );
 188         assert( Req != NULL );
 189
 190         /* Some IRC clients, for example BitchX, send the NICK and USER
 191          * commands in the wrong order ... */
 192         if(Client_Type(Client) == CLIENT_UNKNOWN
 193             || Client_Type(Client) == CLIENT_GOTPASS
 194             || Client_Type(Client) == CLIENT_GOTNICK
 195 #ifndef STRICT_RFC
 196             || Client_Type(Client) == CLIENT_GOTUSER
 197 #endif
 198             || Client_Type(Client) == CLIENT_USER
 199             || Client_Type(Client) == CLIENT_SERVICE
 200             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 201         {
 202                 /* User registration or change of nickname */
 203
 204                 /* Wrong number of arguments? */
 205                 if( Req->argc != 1 )
 206                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 207                                                    Client_ID( Client ),
 208                                                    Req->command );
 209
 210                 /* Search "target" client */
 211                 if( Client_Type( Client ) == CLIENT_SERVER )
 212                 {
 213                         target = Client_Search( Req->prefix );
 214                         if( ! target )
 215                                 return IRC_WriteStrClient( Client,
 216                                                            ERR_NOSUCHNICK_MSG,
 217                                                            Client_ID( Client ),
 218                                                            Req->argv[0] );
 219                 }
 220                 else
 221                 {
 222                         /* Is this a restricted client? */
 223                         if( Client_HasMode( Client, 'r' ))
 224                                 return IRC_WriteStrClient( Client,
 225                                                            ERR_RESTRICTED_MSG,
 226                                                            Client_ID( Client ));
 227
 228                         target = Client;
 229                 }
 230
 231 #ifndef STRICT_RFC
 232                 /* If the clients tries to change to its own nickname we won't
 233                  * do anything. This is how the original ircd behaves and some
 234                  * clients (for example Snak) expect it to be like this.
 235                  * But I doubt that this is "really the right thing" ... */
 236                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 237                         return CONNECTED;
 238 #endif
 239
 240                 /* Check that the new nickname is available. Special case:
 241                  * the client only changes from/to upper to lower case. */
 242                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 243                 {
 244                         if( ! Client_CheckNick( target, Req->argv[0] ))
 245                                 return CONNECTED;
 246                 }
 247
 248                 if (Client_Type(target) != CLIENT_USER &&
 249                     Client_Type(target) != CLIENT_SERVICE &&
 250                     Client_Type(target) != CLIENT_SERVER) {
 251                         /* New client */
 252                         LogDebug("Connection %d: got valid NICK command ...",
 253                              Client_Conn( Client ));
 254
 255                         /* Register new nickname of this client */
 256                         Client_SetID( target, Req->argv[0] );
 257
 258                         /* If we received a valid USER command already then
 259                          * register the new client! */
 260                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 261                                 return Hello_User( Client );
 262                         else
 263                                 Client_SetType( Client, CLIENT_GOTNICK );
 264                 } else {
 265                         /* Nickname change */
 266                         if (Client_Conn(target) > NONE) {
 267                                 /* Local client */
 268                                 Log(LOG_INFO,
 269                                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 270                                     Client_TypeText(target), Client_Mask(target),
 271                                     Client_Conn(target), Client_ID(target),
 272                                     Req->argv[0]);
 273                                 Conn_UpdateIdle(Client_Conn(target));
 274                         } else {
 275                                 /* Remote client */
 276                                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 277                                          Client_TypeText(target),
 278                                          Client_Mask(target), Client_ID(target),
 279                                          Req->argv[0]);
 280                         }
 281
 282                         /* Inform all users and servers (which have to know)
 283                          * of this nickname change */
 284                         if( Client_Type( Client ) == CLIENT_USER )
 285                                 IRC_WriteStrClientPrefix( Client, Client,
 286                                                           "NICK :%s",
 287                                                           Req->argv[0] );
 288                         IRC_WriteStrServersPrefix( Client, target,
 289                                                    "NICK :%s", Req->argv[0] );
 290                         IRC_WriteStrRelatedPrefix( target, target, false,
 291                                                    "NICK :%s", Req->argv[0] );
 292
 293                         /* Register old nickname for WHOWAS queries */
 294                         Client_RegisterWhowas( target );
 295
 296                         /* Save new nickname */
 297                         Client_SetID( target, Req->argv[0] );
 298
 299                         IRC_SetPenalty( target, 2 );
 300                 }
 301
 302                 return CONNECTED;
 303         } else if(Client_Type(Client) == CLIENT_SERVER ||
 304                   Client_Type(Client) == CLIENT_SERVICE) {
 305                 /* Server or service introduces new client */
 306
 307                 /* Bad number of parameters? */
 308                 if (Req->argc != 2 && Req->argc != 7)
 309                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 310                                                   Client_ID(Client), Req->command);
 311
 312                 if (Req->argc >= 7) {
 313                         /* RFC 2813 compatible syntax */
 314                         nick = Req->argv[0];
 315                         hops = atoi(Req->argv[1]);
 316                         user = Req->argv[2];
 317                         hostname = Req->argv[3];
 318                         token = atoi(Req->argv[4]);
 319                         modes = Req->argv[5] + 1;
 320                         info = Req->argv[6];
 321                 } else {
 322                         /* RFC 1459 compatible syntax */
 323                         nick = Req->argv[0];
 324                         hops = 1;
 325                         user = Req->argv[0];
 326                         hostname = Client_ID(Client);
 327                         token = atoi(Req->argv[1]);
 328                         modes = "";
 329                         info = Req->argv[0];
 330                 }
 331
 332                 c = Client_Search(nick);
 333                 if(c) {
 334                         /*
 335                          * the new nick is already present on this server:
 336                          * the new and the old one have to be disconnected now.
 337                          */
 338                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 339                         Kill_Nick( Req->argv[0], "Nick collision" );
 340                         return CONNECTED;
 341                 }
 342
 343                 /* Find the Server this client is connected to */
 344                 intr_c = Client_GetFromToken(Client, token);
 345                 if( ! intr_c )
 346                 {
 347                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 348                         Kill_Nick( Req->argv[0], "Unknown server" );
 349                         return CONNECTED;
 350                 }
 351
 352                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 353                                          token, modes, info, true);
 354                 if( ! c )
 355                 {
 356                         /* out of memory, need to disconnect client to keep network state consistent */
 357                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 358                         Kill_Nick( Req->argv[0], "Server error" );
 359                         return CONNECTED;
 360                 }
 361
 362                 /* RFC 2813: client is now fully registered, inform all the
 363                  * other servers about the new user.
 364                  * RFC 1459: announce the new client only after receiving the
 365                  * USER command, first we need more information! */
 366                 if (Req->argc < 7) {
 367                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 368                                  Client_Mask(c));
 369                         Client_SetType(c, CLIENT_GOTNICK);
 370                 } else
 371                         Introduce_Client(Client, c, CLIENT_USER);
 372
 373                 return CONNECTED;
 374         }
 375         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 376 } /* IRC_NICK */
 377
 378
 379 /**
 380  * Handler for the IRC command "USER".
 381  */
 382 GLOBAL bool
 383 IRC_USER(CLIENT * Client, REQUEST * Req)
 384 {
 385         CLIENT *c;
 386 #ifdef IDENTAUTH
 387         char *ptr;
 388 #endif
 389
 390         assert(Client != NULL);
 391         assert(Req != NULL);
 392
 393         if (Client_Type(Client) == CLIENT_GOTNICK ||
 394 #ifndef STRICT_RFC
 395             Client_Type(Client) == CLIENT_UNKNOWN ||
 396 #endif
 397             Client_Type(Client) == CLIENT_GOTPASS)
 398         {
 399                 /* New connection */
 400                 if (Req->argc != 4)
 401                         return IRC_WriteStrClient(Client,
 402                                                   ERR_NEEDMOREPARAMS_MSG,
 403                                                   Client_ID(Client),
 404                                                   Req->command);
 405
 406                 /* User name */
 407 #ifdef IDENTAUTH
 408                 ptr = Client_User(Client);
 409                 if (!ptr || !*ptr || *ptr == '~')
 410                         Client_SetUser(Client, Req->argv[0], false);
 411 #else
 412                 Client_SetUser(Client, Req->argv[0], false);
 413 #endif
 414                 Client_SetOrigUser(Client, Req->argv[0]);
 415
 416                 /* "Real name" or user info text: Don't set it to the empty
 417                  * string, the original ircd can't deal with such "real names"
 418                  * (e. g. "USER user * * :") ... */
 419                 if (*Req->argv[3])
 420                         Client_SetInfo(Client, Req->argv[3]);
 421                 else
 422                         Client_SetInfo(Client, "-");
 423
 424                 LogDebug("Connection %d: got valid USER command ...",
 425                     Client_Conn(Client));
 426                 if (Client_Type(Client) == CLIENT_GOTNICK)
 427                         return Hello_User(Client);
 428                 else
 429                         Client_SetType(Client, CLIENT_GOTUSER);
 430                 return CONNECTED;
 431
 432         } else if (Client_Type(Client) == CLIENT_SERVER ||
 433                    Client_Type(Client) == CLIENT_SERVICE) {
 434                 /* Server/service updating an user */
 435                 if (Req->argc != 4)
 436                         return IRC_WriteStrClient(Client,
 437                                                   ERR_NEEDMOREPARAMS_MSG,
 438                                                   Client_ID(Client),
 439                                                   Req->command);
 440                 c = Client_Search(Req->prefix);
 441                 if (!c)
 442                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 443                                                   Client_ID(Client),
 444                                                   Req->prefix);
 445
 446                 Client_SetUser(c, Req->argv[0], true);
 447                 Client_SetOrigUser(c, Req->argv[0]);
 448                 Client_SetHostname(c, Req->argv[1]);
 449                 Client_SetInfo(c, Req->argv[3]);
 450
 451                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 452                          Client_Conn(Client), Client_Mask(c));
 453
 454                 /* RFC 1459 style user registration?
 455                  * Introduce client to network: */
 456                 if (Client_Type(c) == CLIENT_GOTNICK)
 457                         Introduce_Client(Client, c, CLIENT_USER);
 458
 459                 return CONNECTED;
 460         } else if (Client_Type(Client) == CLIENT_USER) {
 461                 /* Already registered connection */
 462                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 463                                           Client_ID(Client));
 464         } else {
 465                 /* Unexpected/invalid connection state? */
 466                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 467                                           Client_ID(Client));
 468         }
 469 } /* IRC_USER */
 470
 471
 472 /**
 473  * Handler for the IRC command "SERVICE".
 474  * This function implements IRC Services registration using the SERVICE command
 475  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 476  * At the moment ngIRCd doesn't support directly linked services, so this
 477  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 478  * received from a peer server.
 479  */
 480 GLOBAL bool
 481 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 482 {
 483         CLIENT *c, *intr_c;
 484         char *nick, *user, *host, *info, *modes, *ptr;
 485         int token, hops;
 486
 487         assert(Client != NULL);
 488         assert(Req != NULL);
 489
 490         if (Client_Type(Client) != CLIENT_GOTPASS &&
 491             Client_Type(Client) != CLIENT_SERVER)
 492                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 493                                           Client_ID(Client));
 494
 495         if (Req->argc != 6)
 496                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 497                                           Client_ID(Client), Req->command);
 498
 499         if (Client_Type(Client) != CLIENT_SERVER)
 500                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 501                                   Client_ID(Client), Req->argv[0]);
 502
 503         /* Bad number of parameters? */
 504         if (Req->argc != 6)
 505                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 506                                           Client_ID(Client), Req->command);
 507
 508         nick = Req->argv[0];
 509         user = NULL; host = NULL;
 510         token = atoi(Req->argv[1]);
 511         hops = atoi(Req->argv[4]);
 512         info = Req->argv[5];
 513
 514         /* Validate service name ("nick name") */
 515         c = Client_Search(nick);
 516         if(c) {
 517                 /* Nick name collission: disconnect (KILL) both clients! */
 518                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 519                     Client_ID(Client), nick);
 520                 Kill_Nick(nick, "Nick collision");
 521                 return CONNECTED;
 522         }
 523
 524         /* Get the server to which the service is connected */
 525         intr_c = Client_GetFromToken(Client, token);
 526         if (! intr_c) {
 527                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 528                     Client_ID(Client), nick);
 529                 Kill_Nick(nick, "Unknown server");
 530                 return CONNECTED;
 531         }
 532
 533         /* Get user and host name */
 534         ptr = strchr(nick, '@');
 535         if (ptr) {
 536                 *ptr = '\0';
 537                 host = ++ptr;
 538         }
 539         if (!host)
 540                 host = Client_Hostname(intr_c);
 541         ptr = strchr(nick, '!');
 542         if (ptr) {
 543                 *ptr = '\0';
 544                 user = ++ptr;
 545         }
 546         if (!user)
 547                 user = nick;
 548
 549         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 550          * for future usage"; but we use it to transfer the modes and check
 551          * that the first character is a '+' sign and ignore it otherwise. */
 552         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 553
 554         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 555                                  token, modes, info, true);
 556         if (! c) {
 557                 /* Couldn't create client structure, so KILL the service to
 558                  * keep network status consistent ... */
 559                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 560                     Client_Conn(Client));
 561                 Kill_Nick(nick, "Server error");
 562                 return CONNECTED;
 563         }
 564
 565         Introduce_Client(Client, c, CLIENT_SERVICE);
 566         return CONNECTED;
 567 } /* IRC_SERVICE */
 568
 569
 570 /**
 571  * Handler for the IRC command "WEBIRC".
 572  * Syntax: WEBIRC <password> <username> <real-hostname> <real-IP-address>
 573  */
 574 GLOBAL bool
 575 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 576 {
 577         /* Exactly 4 parameters are requited */
 578         if (Req->argc != 4)
 579                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 580                                           Client_ID(Client), Req->command);
 581
 582         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 583                 return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
 584                                           Client_ID(Client));
 585
 586         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 587                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 588
 589         Client_SetUser(Client, Req->argv[1], true);
 590         Client_SetOrigUser(Client, Req->argv[1]);
 591         Client_SetHostname(Client, Req->argv[2]);
 592         return CONNECTED;
 593 } /* IRC_WEBIRC */
 594
 595
 596 GLOBAL bool
 597 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 598 {
 599         CLIENT *target;
 600         char quitmsg[LINE_LEN];
 601
 602         assert( Client != NULL );
 603         assert( Req != NULL );
 604
 605         /* Wrong number of arguments? */
 606         if( Req->argc > 1 )
 607                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 608
 609         if (Req->argc == 1)
 610                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 611
 612         if ( Client_Type( Client ) == CLIENT_SERVER )
 613         {
 614                 /* Server */
 615                 target = Client_Search( Req->prefix );
 616                 if( ! target )
 617                 {
 618                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 619                         return CONNECTED;
 620                 }
 621
 622                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 623
 624                 return CONNECTED;
 625         }
 626         else
 627         {
 628                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 629                         /* " " to avoid confusion */
 630                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 631                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 632                         strlcat(quitmsg, "\"", sizeof quitmsg );
 633                 }
 634
 635                 /* User, Service, or not yet registered */
 636                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 637
 638                 return DISCONNECTED;
 639         }
 640 } /* IRC_QUIT */
 641
 642
 643 GLOBAL bool
 644 IRC_PING(CLIENT *Client, REQUEST *Req)
 645 {
 646         CLIENT *target, *from;
 647
 648         assert(Client != NULL);
 649         assert(Req != NULL);
 650
 651         if (Req->argc < 1)
 652                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 653                                           Client_ID(Client));
 654 #ifdef STRICT_RFC
 655         /* Don't ignore additional arguments when in "strict" mode */
 656         if (Req->argc > 2)
 657                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 658                                            Client_ID(Client), Req->command);
 659 #endif
 660
 661         if (Req->argc > 1) {
 662                 /* A target has been specified ... */
 663                 target = Client_Search(Req->argv[1]);
 664
 665                 if (!target || Client_Type(target) != CLIENT_SERVER)
 666                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 667                                         Client_ID(Client), Req->argv[1]);
 668
 669                 if (target != Client_ThisServer()) {
 670                         /* Ok, we have to forward the PING */
 671                         if (Client_Type(Client) == CLIENT_SERVER)
 672                                 from = Client_Search(Req->prefix);
 673                         else
 674                                 from = Client;
 675                         if (!from)
 676                                 return IRC_WriteStrClient(Client,
 677                                                 ERR_NOSUCHSERVER_MSG,
 678                                                 Client_ID(Client), Req->prefix);
 679
 680                         return IRC_WriteStrClientPrefix(target, from,
 681                                         "PING %s :%s", Req->argv[0],
 682                                         Req->argv[1] );
 683                 }
 684         }
 685
 686         if (Client_Type(Client) == CLIENT_SERVER) {
 687                 if (Req->prefix)
 688                         from = Client_Search(Req->prefix);
 689                 else
 690                         from = Client;
 691         } else
 692                 from = Client_ThisServer();
 693         if (!from)
 694                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 695                                         Client_ID(Client), Req->prefix);
 696
 697         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 698             Client_Conn(Client));
 699
 700 #ifdef STRICT_RFC
 701         return IRC_WriteStrClient(Client, "PONG %s :%s",
 702                 Client_ID(from), Client_ID(Client));
 703 #else
 704         /* Some clients depend on the argument being returned in the PONG
 705          * reply (not mentioned in any RFC, though) */
 706         return IRC_WriteStrClient(Client, "PONG %s :%s",
 707                 Client_ID(from), Req->argv[0]);
 708 #endif
 709 } /* IRC_PING */
 710
 711
 712 GLOBAL bool
 713 IRC_PONG(CLIENT *Client, REQUEST *Req)
 714 {
 715         CLIENT *target, *from;
 716         char *s;
 717
 718         assert(Client != NULL);
 719         assert(Req != NULL);
 720
 721         /* Wrong number of arguments? */
 722         if (Req->argc < 1)
 723                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 724                                           Client_ID(Client));
 725         if (Req->argc > 2)
 726                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 727                                           Client_ID(Client), Req->command);
 728
 729         /* Forward? */
 730         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 731                 target = Client_Search(Req->argv[0]);
 732                 if (!target)
 733                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 734                                         Client_ID(Client), Req->argv[0]);
 735
 736                 from = Client_Search(Req->prefix);
 737
 738                 if (target != Client_ThisServer() && target != from) {
 739                         /* Ok, we have to forward the message. */
 740                         if (!from)
 741                                 return IRC_WriteStrClient(Client,
 742                                                 ERR_NOSUCHSERVER_MSG,
 743                                                 Client_ID(Client), Req->prefix);
 744
 745                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 746                                 s = Client_ID(from);
 747                         else
 748                                 s = Req->argv[0];
 749                         return IRC_WriteStrClientPrefix(target, from,
 750                                  "PONG %s :%s", s, Req->argv[1]);
 751                 }
 752         }
 753
 754         /* The connection timestamp has already been updated when the data has
 755          * been read from so socket, so we don't need to update it here. */
 756 #ifdef DEBUG
 757         if (Client_Conn(Client) > NONE)
 758                 Log(LOG_DEBUG,
 759                         "Connection %d: received PONG. Lag: %ld seconds.",
 760                         Client_Conn(Client),
 761                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 762         else
 763                  Log(LOG_DEBUG,
 764                         "Connection %d: received PONG.", Client_Conn(Client));
 765 #endif
 766         return CONNECTED;
 767 } /* IRC_PONG */
 768
 769
 770 static bool
 771 Hello_User(CLIENT * Client)
 772 {
 773 #ifdef PAM
 774         int pipefd[2], result;
 775         CONN_ID conn;
 776         pid_t pid;
 777
 778         assert(Client != NULL);
 779         conn = Client_Conn(Client);
 780
 781         if (Conf_NoPAM) {
 782                 /* Don't do any PAM authentication at all, instead emulate
 783                  * the beahiour of the daemon compiled without PAM support:
 784                  * because there can't be any "server password", all
 785                  * passwords supplied are classified as "wrong". */
 786                 if(Client_Password(Client)[0] == '\0')
 787                         return Hello_User_PostAuth(Client);
 788                 Reject_Client(Client);
 789                 return DISCONNECTED;
 790         }
 791
 792         /* Fork child process for PAM authentication; and make sure that the
 793          * process timeout is set higher than the login timeout! */
 794         pid = Proc_Fork(Conn_GetProcStat(conn), pipefd,
 795                         cb_Read_Auth_Result, Conf_PongTimeout + 1);
 796         if (pid > 0) {
 797                 LogDebug("Authenticator for connection %d created (PID %d).",
 798                          conn, pid);
 799                 return CONNECTED;
 800         } else {
 801                 /* Sub process */
 802                 Log_Init_Subprocess("Auth");
 803                 result = PAM_Authenticate(Client);
 804                 write(pipefd[1], &result, sizeof(result));
 805                 Log_Exit_Subprocess("Auth");
 806                 exit(0);
 807         }
 808 #else
 809         assert(Client != NULL);
 810
 811         /* Check global server password ... */
 812         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 813                 /* Bad password! */
 814                 Reject_Client(Client);
 815                 return DISCONNECTED;
 816         }
 817         return Hello_User_PostAuth(Client);
 818 #endif
 819 }
 820
 821
 822 #ifdef PAM
 823
 824 /**
 825  * Read result of the authenticatior sub-process from pipe
 826  */
 827 static void
 828 cb_Read_Auth_Result(int r_fd, UNUSED short events)
 829 {
 830         CONN_ID conn;
 831         CLIENT *client;
 832         int result;
 833         size_t len;
 834         PROC_STAT *proc;
 835
 836         LogDebug("Auth: Got callback on fd %d, events %d", r_fd, events);
 837         conn = Conn_GetFromProc(r_fd);
 838         if (conn == NONE) {
 839                 /* Ops, none found? Probably the connection has already
 840                  * been closed!? We'll ignore that ... */
 841                 io_close(r_fd);
 842                 LogDebug("Auth: Got callback for unknown connection!?");
 843                 return;
 844         }
 845         proc = Conn_GetProcStat(conn);
 846         client = Conn_GetClient(conn);
 847
 848         /* Read result from pipe */
 849         len = Proc_Read(proc, &result, sizeof(result));
 850         if (len == 0)
 851                 return;
 852
 853         if (len != sizeof(result)) {
 854                 Log(LOG_CRIT, "Auth: Got malformed result!");
 855                 Reject_Client(client);
 856                 return;
 857         }
 858
 859         if (result == true) {
 860                 Client_SetUser(client, Client_OrigUser(client), true);
 861                 (void)Hello_User_PostAuth(client);
 862         } else
 863                 Reject_Client(client);
 864 }
 865
 866 #endif
 867
 868
 869 static void
 870 Reject_Client(CLIENT *Client)
 871 {
 872         Log(LOG_ERR,
 873             "User \"%s\" rejected (connection %d): Access denied!",
 874             Client_Mask(Client), Client_Conn(Client));
 875         Conn_Close(Client_Conn(Client), NULL,
 876                    "Access denied! Bad password?", true);
 877 }
 878
 879
 880 static bool
 881 Hello_User_PostAuth(CLIENT *Client)
 882 {
 883         Introduce_Client(NULL, Client, CLIENT_USER);
 884
 885         if (!IRC_WriteStrClient
 886             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 887                 return false;
 888         if (!IRC_WriteStrClient
 889             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 890              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 891              TARGET_VENDOR, TARGET_OS))
 892                 return false;
 893         if (!IRC_WriteStrClient
 894             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 895                 return false;
 896         if (!IRC_WriteStrClient
 897             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 898              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 899              CHANMODES))
 900                 return false;
 901
 902         /* Features supported by this server (005 numeric, ISUPPORT),
 903          * see <http://www.irc.org/tech_docs/005.html> for details. */
 904         if (!IRC_Send_ISUPPORT(Client))
 905                 return DISCONNECTED;
 906
 907         if (!IRC_Send_LUSERS(Client))
 908                 return DISCONNECTED;
 909         if (!IRC_Show_MOTD(Client))
 910                 return DISCONNECTED;
 911
 912         /* Suspend the client for a second ... */
 913         IRC_SetPenalty(Client, 1);
 914
 915         return CONNECTED;
 916 }
 917
 918
 919 static void
 920 Kill_Nick( char *Nick, char *Reason )
 921 {
 922         REQUEST r;
 923
 924         assert( Nick != NULL );
 925         assert( Reason != NULL );
 926
 927         r.prefix = (char *)Client_ThisServer( );
 928         r.argv[0] = Nick;
 929         r.argv[1] = Reason;
 930         r.argc = 2;
 931
 932         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 933         IRC_KILL( Client_ThisServer( ), &r );
 934 } /* Kill_Nick */
 935
 936
 937 static void
 938 Introduce_Client(CLIENT *From, CLIENT *Client, int Type)
 939 {
 940         /* Set client type (user or service) */
 941         Client_SetType(Client, Type);
 942
 943         if (From) {
 944                 if (Conf_IsService(Conf_GetServer(Client_Conn(From)),
 945                                    Client_ID(Client)))
 946                         Client_SetType(Client, CLIENT_SERVICE);
 947                 LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
 948                          Client_TypeText(Client), Client_Mask(Client),
 949                          Client_Modes(Client), Client_ID(From),
 950                          Client_ID(Client_Introducer(Client)),
 951                          Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
 952         } else {
 953                 Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
 954                     Client_TypeText(Client), Client_Mask(Client),
 955                     Client_Conn(Client));
 956                 Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
 957                                  Client_ID(Client), Client_User(Client),
 958                                  Client_Hostname(Client),
 959                                  Conn_IPA(Client_Conn(Client)),
 960                                  Client_TypeText(Client));
 961         }
 962
 963         /* Inform other servers */
 964         IRC_WriteStrServersPrefixFlag_CB(From,
 965                                 From != NULL ? From : Client_ThisServer(),
 966                                 '\0', cb_introduceClient, (void *)Client);
 967 } /* Introduce_Client */
 968
 969
 970 static void
 971 cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
 972 {
 973         CLIENT *c = (CLIENT *)data;
 974         CONN_ID conn;
 975         char *modes, *user, *host;
 976
 977         modes = Client_Modes(c);
 978         user = Client_User(c) ? Client_User(c) : "-";
 979         host = Client_Hostname(c) ? Client_Hostname(c) : "-";
 980
 981         conn = Client_Conn(To);
 982         if (Conn_Options(conn) & CONN_RFC1459) {
 983                 /* RFC 1459 mode: separate NICK and USER commands */
 984                 Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
 985                               Client_Hops(c) + 1);
 986                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 987                               Client_ID(c), user, host,
 988                               Client_ID(Client_Introducer(c)), Client_Info(c));
 989                 if (modes[0])
 990                         Conn_WriteStr(conn, ":%s MODE %s +%s",
 991                                       Client_ID(c), Client_ID(c), modes);
 992         } else {
 993                 /* RFC 2813 mode: one combined NICK or SERVICE command */
 994                 if (Client_Type(c) == CLIENT_SERVICE
 995                     && strchr(Client_Flags(To), 'S'))
 996                         IRC_WriteStrClientPrefix(To, Prefix,
 997                                          "SERVICE %s %d * +%s %d :%s",
 998                                          Client_Mask(c),
 999                                          Client_MyToken(Client_Introducer(c)),
1000                                          Client_Modes(c), Client_Hops(c) + 1,
1001                                          Client_Info(c));
1002                 else
1003                         IRC_WriteStrClientPrefix(To, Prefix,
1004                                          "NICK %s %d %s %s %d +%s :%s",
1005                                          Client_ID(c), Client_Hops(c) + 1,
1006                                          user, host,
1007                                          Client_MyToken(Client_Introducer(c)),
1008                                          modes, Client_Info(c));
1009         }
1010 } /* cb_introduceClient */
1011
1012
1013 /* -eof- */