trusts/trusts_policy.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <unistd.h>
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7 #include <netinet/in.h>
   8
   9 #ifndef __USE_MISC
  10 #define __USE_MISC /* inet_aton */
  11 #endif
  12
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <sys/poll.h>
  16 #include <errno.h>
  17 #include <fcntl.h>
  18
  19 #include "../lib/version.h"
  20 #include "../lib/hmac.h"
  21 #include "../core/events.h"
  22 #include "../core/schedule.h"
  23 #include "../core/nsmalloc.h"
  24 #include "../core/hooks.h"
  25 #include "../core/config.h"
  26 #include "../control/control.h"
  27 #include "../lib/irc_string.h"
  28 #include "../irc/irc.h"
  29 #include "../glines/glines.h"
  30 #include "trusts.h"
  31
  32 MODULE_VERSION("");
  33
  34 static int countext, enforcepolicy_irc, enforcepolicy_auth;
  35
  36 #define TRUSTBUFSIZE 8192
  37 #define TRUSTPASSLEN 128
  38 #define NONCELEN 16
  39
  40 typedef struct trustsocket {
  41   int fd;
  42   int authed;
  43   char authuser[SERVERLEN+1];
  44   char buf[TRUSTBUFSIZE];
  45   unsigned char nonce[NONCELEN];
  46   int size;
  47   time_t connected;
  48   time_t timeout;
  49   int accepted;
  50   int rejected;
  51
  52   struct trustsocket *next;
  53 } trustsocket;
  54
  55 static trustsocket *tslist;
  56 static int listenerfd = -1;
  57 static FILE *urandom;
  58
  59 typedef struct trustaccount {
  60   int used;
  61   char server[SERVERLEN+1];
  62   char password[TRUSTPASSLEN+1];
  63 } trustaccount;
  64
  65 trustaccount trustaccounts[MAXSERVERS];
  66
  67 static int checkconnectionth(const char *username, struct irc_in_addr *ip, trusthost *th, int hooknum, int usercountadjustment, char *message, size_t messagelen) {
  68   trustgroup *tg;
  69
  70   if(messagelen>0)
  71     message[0] = '\0';
  72
  73   if(!th || !trustsdbloaded)
  74     return POLICY_SUCCESS;
  75
  76   tg = th->group;
  77
  78   /*
  79    * the purpose of this logic is to avoid spam like this:
  80    * WARNING: tgX exceeded limit: 11 connected vs 10 max
  81    * (goes back down to 10)
  82    * WARNING: tgX exceeded limit: 11 connected vs 10 max
  83    */
  84
  85   if(hooknum == HOOK_TRUSTS_NEWNICK) {
  86     patricia_node_t *head, *node;
  87     int nodecount = 0;
  88
  89     head = refnode(iptree, ip, th->nodebits);
  90     PATRICIA_WALK(head, node)
  91     {
  92       nodecount += node->usercount;
  93     }
  94     PATRICIA_WALK_END;
  95     derefnode(iptree, head);
  96
  97     if(th->maxpernode && nodecount + usercountadjustment > th->maxpernode) {
  98       controlwall(NO_OPER, NL_TRUSTS, "Hard connection limit exceeded on subnet: %s (group: %s): %d connected, %d max.", trusts_cidr2str(ip, th->nodebits), tg->name->content, nodecount + usercountadjustment, th->maxpernode);
  99       snprintf(message, messagelen, "Too many connections from your host (%s) - see https://www.quakenet.org/help/trusts/connection-limit for details.", IPtostr(*ip));
 100       return POLICY_FAILURE_NODECOUNT;
 101     }
 102
 103     if(tg->trustedfor && tg->count + usercountadjustment > tg->trustedfor) {
 104       if(tg->count > (long)tg->exts[countext]) {
 105         tg->exts[countext] = (void *)(long)tg->count;
 106
 107         controlwall(NO_OPER, NL_TRUSTS, "Hard connection limit exceeded (group %s): %d connected, %d max.", tg->name->content, tg->count + usercountadjustment, tg->trustedfor);
 108         snprintf(message, messagelen, "Too many connections from your trust (%s) - see https://www.quakenet.org/help/trusts/connection-limit for details.", IPtostr(*ip));
 109       }
 110
 111       snprintf(message, messagelen, "Too many connections from your trust (%s) - see https://www.quakenet.org/help/trusts/connection-limit for details.", IPtostr(*ip));
 112       return POLICY_FAILURE_GROUPCOUNT;
 113     }
 114
 115     if((tg->flags & TRUST_ENFORCE_IDENT) && (username[0] == '~')) {
 116       controlwall(NO_OPER, NL_TRUSTS, "Ident required: %s@%s (group: %s).", username, IPtostr(*ip), tg->name->content);
 117       snprintf(message, messagelen, "IDENTD required from your host (%s) - see https://www.quakenet.org/help/trusts/connection-limit for details.", IPtostr(*ip));
 118       return POLICY_FAILURE_IDENTD;
 119     }
 120
 121     if(tg->maxperident > 0) {
 122       int identcount = 0;
 123       trusthost *th2;
 124       nick *tnp;
 125
 126       for(th2=tg->hosts;th2;th2=th2->next) {
 127         for(tnp=th2->users;tnp;tnp=nextbytrust(tnp)) {
 128           if(!ircd_strcmp(tnp->ident, username))
 129             identcount++;
 130         }
 131       }
 132
 133       if(identcount + usercountadjustment > tg->maxperident) {
 134         controlwall(NO_OPER, NL_TRUSTS, "Hard ident limit exceeded: %s@%s (group: %s): %d connected, %d max.", username, IPtostr(*ip), tg->name->content, identcount + usercountadjustment, tg->maxperident);
 135         snprintf(message, messagelen, "Too many connections from your username (%s@%s) - see https://www.quakenet.org/help/trusts/connection-limit for details.", username, IPtostr(*ip));
 136         return POLICY_FAILURE_IDENTCOUNT;
 137       }
 138     }
 139   } else {
 140     if(tg->count < tg->maxusage)
 141       tg->exts[countext] = (void *)(long)tg->count;
 142   }
 143
 144   if(tg->trustedfor > 0)
 145     snprintf(message, messagelen, "Trust has %d out of %d allowed connections.", tg->count + usercountadjustment, tg->trustedfor);
 146
 147   return POLICY_SUCCESS;
 148 }
 149
 150 static int checkconnection(const char *username, struct irc_in_addr *ip, int hooknum, int cloneadjustment, char *message, size_t messagelen) {
 151   struct irc_in_addr ip_canonicalized;
 152   ip_canonicalize_tunnel(&ip_canonicalized, ip);
 153
 154   return checkconnectionth(username, &ip_canonicalized, th_getbyhost(&ip_canonicalized), hooknum, cloneadjustment, message, messagelen);
 155 }
 156
 157 static int trustdowrite(trustsocket *sock, char *format, ...) {
 158   char buf[1024];
 159   va_list va;
 160   int r;
 161
 162   va_start(va, format);
 163   r = vsnprintf(buf, sizeof(buf), format, va);
 164   va_end(va);
 165
 166   if(r >= sizeof(buf))
 167     r = sizeof(buf) - 1;
 168
 169   buf[r] = '\n';
 170
 171   if(write(sock->fd, buf, r + 1) != r + 1)
 172     return 0;
 173   return 1;
 174 }
 175
 176 static int policycheck_auth(trustsocket *sock, const char *sequence_id, const char *username, const char *host) {
 177   char message[512];
 178   int verdict;
 179   struct irc_in_addr ip;
 180   unsigned char bits;
 181
 182   if(!ipmask_parse(host, &ip, &bits)) {
 183     sock->accepted++;
 184     return trustdowrite(sock, "PASS %s", sequence_id);
 185   }
 186
 187   verdict = checkconnection(username, &ip, HOOK_TRUSTS_NEWNICK, 1, message, sizeof(message));
 188
 189   if(!enforcepolicy_auth)
 190     verdict = POLICY_SUCCESS;
 191
 192   if (verdict == POLICY_SUCCESS) {
 193     sock->accepted++;
 194
 195     if(message[0])
 196       return trustdowrite(sock, "PASS %s %s", sequence_id, message);
 197     else
 198       return trustdowrite(sock, "PASS %s", sequence_id);
 199   } else {
 200     sock->rejected++;
 201
 202     controlwall(NO_OPER, NL_TRUSTS, "Rejected connection from %s@%s using IAuth: %s", username, host, message);
 203     return trustdowrite(sock, "KILL %s %s", sequence_id, message);
 204   }
 205 }
 206
 207 static int trustkillconnection(trustsocket *sock, char *reason) {
 208   trustdowrite(sock, "QUIT %s", reason);
 209   return 0;
 210 }
 211
 212 static void trustfreeconnection(trustsocket *sock, int unlink) {
 213   trustsocket **pnext, *ts;
 214
 215   if(!unlink) {
 216     deregisterhandler(sock->fd, 1);
 217     nsfree(POOL_TRUSTS, sock);
 218     return;
 219   }
 220
 221   pnext = &tslist;
 222
 223   for(ts=*pnext;*pnext;pnext=&((*pnext)->next)) {
 224     if(ts == sock) {
 225       *pnext = sock->next;
 226       trustfreeconnection(sock, 0);
 227       break;
 228     }
 229   }
 230 }
 231
 232 static int handletrustauth(trustsocket *sock, char *server_name, char *mac) {
 233   int i;
 234   char *password = NULL;
 235   unsigned char digest[16];
 236   char noncehexbuf[NONCELEN * 2 + 1];
 237   char hexbuf[sizeof(digest) * 2 + 1];
 238
 239   for(i=0;i<MAXSERVERS;i++) {
 240     if(trustaccounts[i].used && strcmp(trustaccounts[i].server, server_name) == 0) {
 241       password = trustaccounts[i].password;
 242       break;
 243     }
 244   }
 245
 246   if (!password) {
 247     controlwall(NO_OPER, NL_TRUSTS, "Invalid servername for policy socket: '%s'", server_name);
 248     return trustkillconnection(sock, "Invalid servername.");
 249   }
 250
 251   hmacmd5 h;
 252   hmacmd5_init(&h, (unsigned char *)password, strlen(password));
 253   hmacmd5_update(&h, (unsigned char *)hmac_printhex(sock->nonce, noncehexbuf, NONCELEN), NONCELEN * 2);
 254   hmacmd5_final(&h, digest);
 255   if(hmac_strcmp(mac, hmac_printhex(digest, hexbuf, sizeof(digest)))) {
 256     controlwall(NO_OPER, NL_TRUSTS, "Invalid password for policy socket with servername '%s'.", server_name);
 257     return trustkillconnection(sock, "Bad MAC.");
 258   }
 259
 260   sock->authed = 1;
 261   strncpy(sock->authuser, server_name, SERVERLEN);
 262
 263   controlwall(NO_OPER, NL_TRUSTS, "Successful authentication for policy socket with servername '%s'.", server_name);
 264   return trustdowrite(sock, "AUTHOK");
 265 }
 266
 267 #define MAXTOKENS 10
 268 static int handletrustline(trustsocket *sock, char *line) {
 269   char *command, *p, *lastpos;
 270   char *tokens[MAXTOKENS];
 271   int tokensfound = -1;
 272
 273   for(command=lastpos=p=line;*p;p++) {
 274     if(*p == ' ') {
 275       *p = '\0';
 276       if(tokensfound == MAXTOKENS)
 277         return trustkillconnection(sock, "too many tokens");
 278
 279       if(tokensfound >= 0) {
 280         tokens[tokensfound++] = lastpos;
 281       } else {
 282         tokensfound++;
 283       }
 284       lastpos = p + 1;
 285     }
 286   }
 287   if(lastpos != p) {
 288     if(tokensfound == MAXTOKENS)
 289       return trustkillconnection(sock, "too many tokens");
 290     tokens[tokensfound++] = lastpos;
 291   }
 292
 293   if(!sock->authed && !strcmp("AUTH", command)) {
 294     if(tokensfound != 2)
 295       return trustkillconnection(sock, "incorrect arg count for command.");
 296
 297     return handletrustauth(sock, tokens[0], tokens[1]);
 298   } else if(sock->authed && !strcmp("CHECK", command)) {
 299     if(tokensfound != 3)
 300       return trustkillconnection(sock, "incorrect arg count for command.");
 301
 302     policycheck_auth(sock, tokens[0], tokens[1], tokens[2]);
 303     return 1;
 304   } else {
 305     Error("trusts_policy", ERR_WARNING, "Bad command: %s", command);
 306     return 0;
 307   }
 308 }
 309
 310 static trustsocket *findtrustsocketbyfd(int fd) {
 311   for(trustsocket *ts=tslist;ts;ts=ts->next)
 312     if(ts->fd==fd)
 313       return ts;
 314
 315   return NULL;
 316 }
 317
 318 static int handletrustclient(trustsocket *sock) {
 319   int r, remaining = TRUSTBUFSIZE - sock->size, i;
 320   char *lastpos, *c;
 321
 322   if(!remaining) {
 323     trustkillconnection(sock, "Buffer overflow.");
 324     return 0;
 325   }
 326
 327   r = read(sock->fd, sock->buf + sock->size, remaining);
 328   if(r <= 0)
 329     return 0;
 330
 331   sock->size+=r;
 332   lastpos = sock->buf;
 333
 334   for(c=sock->buf,i=0;i<sock->size;i++,c++) {
 335     if(*c != '\n')
 336       continue;
 337     *c = '\0';
 338     if(!handletrustline(sock, lastpos))
 339       return 0;
 340
 341     lastpos = c + 1; /* is this ok? */
 342   }
 343   sock->size-=lastpos - sock->buf;
 344   memmove(sock->buf, lastpos, sock->size);
 345
 346   return 1;
 347 }
 348
 349 static void processtrustclient(int fd, short events) {
 350   trustsocket *sock = findtrustsocketbyfd(fd);
 351
 352   if(!sock)
 353     return;
 354
 355   if(events & POLLIN)
 356     if(!handletrustclient(sock))
 357       trustfreeconnection(sock, 1);
 358 }
 359
 360 static void trustdotimeout(void *arg) {
 361   time_t t = time(NULL);
 362   trustsocket **pnext, *sock;
 363
 364   pnext = &tslist;
 365
 366   for(sock=*pnext;*pnext;pnext=&((*pnext)->next)) {
 367     if(!sock->authed && t >= sock->timeout) {
 368       trustkillconnection(sock, "Auth timeout.");
 369       *pnext = sock->next;
 370       trustfreeconnection(sock, 0);
 371     }
 372   }
 373 }
 374
 375 static void processtrustlistener(int fd, short events) {
 376   if(events & POLLIN) {
 377     trustsocket *sock;
 378     char buf[NONCELEN * 2 + 1];
 379
 380     int newfd = accept(fd, NULL, NULL), flags;
 381     if(newfd == -1)
 382       return;
 383
 384     flags = fcntl(newfd, F_GETFL, 0);
 385     if(flags < 0) {
 386       Error("trusts_policy", ERR_WARNING, "Unable to set socket non-blocking.");
 387       close(newfd);
 388       return;
 389     }
 390
 391     if(fcntl(fd, F_SETFL, flags|O_NONBLOCK) < 0) {
 392       Error("trusts_policy", ERR_WARNING, "Unable to set socket non-blocking.");
 393       close(newfd);
 394       return;
 395     }
 396
 397     registerhandler(newfd, POLLIN|POLLERR|POLLHUP, processtrustclient);
 398
 399     sock = nsmalloc(POOL_TRUSTS, sizeof(trustsocket));
 400     if(!sock) {
 401       deregisterhandler(newfd, 1);
 402       return;
 403     }
 404
 405     sock->fd = newfd;
 406     sock->next = tslist;
 407     tslist = sock;
 408
 409     if(fread((char *)sock->nonce, 1, NONCELEN, urandom) != NONCELEN) {
 410       Error("trusts_policy", ERR_WARNING, "Error getting random bytes.");
 411       deregisterhandler(newfd, 1);
 412       tslist = sock->next;
 413       nsfree(POOL_TRUSTS, sock);
 414     } else {
 415       sock->authed = 0;
 416       sock->size = 0;
 417       sock->connected = time(NULL);
 418       sock->timeout = time(NULL) + 30;
 419       sock->accepted = 0;
 420       sock->rejected = 0;
 421       if(!trustdowrite(sock, "AUTH %s", hmac_printhex(sock->nonce, buf, NONCELEN))) {
 422         Error("trusts_policy", ERR_WARNING, "Error writing auth to fd %d.", newfd);
 423         deregisterhandler(newfd, 1);
 424         tslist = sock->next;
 425         nsfree(POOL_TRUSTS, sock);
 426         return;
 427       }
 428     }
 429   }
 430 }
 431
 432 static int createlistenersock(int port) {
 433   struct sockaddr_in s;
 434   int fd;
 435   int optval;
 436
 437   memset(&s, 0, sizeof(struct sockaddr_in));
 438   s.sin_family = AF_INET;
 439   s.sin_addr.s_addr = INADDR_ANY;
 440   s.sin_port = htons(port);
 441
 442   fd = socket(PF_INET, SOCK_STREAM, 0);
 443   if(fd < 0) {
 444     Error("trusts_policy", ERR_WARNING, "Unable to get socket for trustfd.");
 445     return -1;
 446   }
 447
 448   optval = 1;
 449   setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
 450
 451   if(bind(fd, (struct sockaddr *)&s, sizeof(struct sockaddr_in)) < 0) {
 452     Error("trusts_policy", ERR_WARNING, "Unable to bind trustfd.");
 453     close(fd);
 454     return -1;
 455   }
 456
 457   if(listen(fd, 5) < 0) {
 458     Error("trusts_policy", ERR_WARNING, "Unable to listen on trustfd.");
 459     close(fd);
 460     return -1;
 461   }
 462
 463   registerhandler(fd, POLLIN, processtrustlistener);
 464
 465   return fd;
 466 }
 467
 468 static void policycheck_irc(int hooknum, void *arg) {
 469   void **args = arg;
 470   nick *np = args[0];
 471   long moving = (long)args[1];
 472   char message[512];
 473   int verdict;
 474
 475   if(moving)
 476     return;
 477
 478   verdict = checkconnectionth(np->ident, &np->p_nodeaddr, gettrusthost(np), hooknum, 0, message, sizeof(message));
 479
 480   if(!enforcepolicy_irc)
 481     verdict = POLICY_SUCCESS;
 482
 483   switch (verdict) {
 484     case POLICY_FAILURE_NODECOUNT:
 485       glinebynick(np, POLICY_GLINE_DURATION, message, GLINE_IGNORE_TRUST, "trusts_policy");
 486       break;
 487     case POLICY_FAILURE_IDENTD:
 488       glinebyip("~*", &np->p_ipaddr, 128, POLICY_GLINE_DURATION, message, GLINE_ALWAYS_USER|GLINE_IGNORE_TRUST, "trusts_policy");
 489       break;
 490     case POLICY_FAILURE_IDENTCOUNT:
 491       glinebynick(np, POLICY_GLINE_DURATION, message, GLINE_ALWAYS_USER|GLINE_IGNORE_TRUST, "trusts_policy");
 492       break;
 493   }
 494 }
 495
 496 static int trusts_cmdtrustpolicyirc(void *source, int cargc, char **cargv) {
 497   nick *sender = source;
 498
 499   if(cargc < 1) {
 500     controlreply(sender, "Use of glines for trust policy enforcement is currently %s.", enforcepolicy_irc?"enabled":"disabled");
 501     return CMD_OK;
 502   }
 503
 504   enforcepolicy_irc = atoi(cargv[0]);
 505   controlwall(NO_OPER, NL_TRUSTS, "%s %s use of glines for trust policy enforcement.", controlid(sender), enforcepolicy_irc?"enabled":"disabled");
 506   controlreply(sender, "Use of glines for trust policy enforcement is now %s.", enforcepolicy_irc?"enabled":"disabled");
 507
 508   return CMD_OK;
 509 }
 510
 511 static int trusts_cmdtrustpolicyauth(void *source, int cargc, char **cargv) {
 512   nick *sender = source;
 513
 514   if(cargc < 1) {
 515     controlreply(sender, "Trust policy enforcement with IAuth is currently %s.", enforcepolicy_auth?"enabled":"disabled");
 516     return CMD_OK;
 517   }
 518
 519   enforcepolicy_auth = atoi(cargv[0]);
 520   controlwall(NO_OPER, NL_TRUSTS, "%s %s trust policy enforcement with IAuth.", controlid(sender), enforcepolicy_auth?"enabled":"disabled");
 521   controlreply(sender, "Trust policy enforcement with IAuth is now %s.", enforcepolicy_auth?"enabled":"disabled");
 522
 523   return CMD_OK;
 524 }
 525
 526
 527 static int trusts_cmdtrustsockets(void *source, int cargc, char **cargv) {
 528   nick *sender = source;
 529   time_t now;
 530   trustsocket *sock;
 531
 532   time(&now);
 533
 534   controlreply(sender, "Server                   Connected for             Accepted        Rejected");
 535
 536   for(sock=tslist;sock;sock=sock->next)
 537     controlreply(sender, "%-20s %20s %10d %15d", sock->authed?sock->authuser:"<not authenticated>", longtoduration(now - sock->connected, 0), sock->accepted, sock->rejected);
 538
 539   controlreply(sender, "-- End of list.");
 540   return CMD_OK;
 541 }
 542
 543 void loadtrustaccounts(void) {
 544   array *accts;
 545
 546   memset(trustaccounts, 0, sizeof(trustaccounts));
 547
 548   accts = getconfigitems("trusts_policy", "server");
 549   if(!accts) {
 550     Error("trusts_policy", ERR_INFO, "No servers added.");
 551   } else {
 552     sstring **servers = (sstring **)(accts->content);
 553     int i;
 554     for(i=0;i<accts->cursi;i++) {
 555       char server[512];
 556       char *pos;
 557
 558       if(i>=MAXSERVERS) {
 559         Error("trusts_policy", ERR_INFO, "Too many servers specified.");
 560         break;
 561       }
 562
 563       strncpy(server, servers[i]->content, sizeof(server));
 564
 565       pos = strchr(server, ',');
 566
 567       if(!pos) {
 568         Error("trusts_policy", ERR_INFO, "Server line is missing password: %s", server);
 569         continue;
 570       }
 571
 572       *pos = '\0';
 573
 574       trustaccounts[i].used = 1;
 575       strncpy(trustaccounts[i].server, server, SERVERLEN);
 576       strncpy(trustaccounts[i].password, pos+1, TRUSTPASSLEN);
 577     }
 578   }
 579 }
 580
 581 static void trustaccounts_rehash(int hooknum, void *arg) {
 582   loadtrustaccounts();
 583 }
 584
 585 void _init(void) {
 586   sstring *m;
 587   int trustport;
 588
 589   countext = registertgext("count");
 590   if(countext == -1)
 591     return;
 592
 593   m = getconfigitem("trusts_policy", "enforcepolicy_irc");
 594   if(m)
 595     enforcepolicy_irc = atoi(m->content);
 596
 597   m = getconfigitem("trusts_policy", "enforcepolicy_auth");
 598   if(m)
 599     enforcepolicy_auth = atoi(m->content);
 600
 601   m = getconfigitem("trusts_policy", "trustport");
 602   if(m)
 603     trustport = atoi(m->content);
 604   else
 605     trustport = DEFAULT_TRUSTPORT;
 606
 607   if(trustport)
 608     listenerfd = createlistenersock(trustport);
 609
 610   loadtrustaccounts();
 611
 612   registerhook(HOOK_TRUSTS_NEWNICK, policycheck_irc);
 613   registerhook(HOOK_TRUSTS_LOSTNICK, &policycheck_irc);
 614   registerhook(HOOK_CORE_REHASH, trustaccounts_rehash);
 615
 616   registercontrolhelpcmd("trustpolicyirc", NO_DEVELOPER, 1, trusts_cmdtrustpolicyirc, "Usage: trustpolicyirc ?1|0?\nEnables or disables policy enforcement (IRC). Shows current status when no parameter is specified.");
 617   registercontrolhelpcmd("trustpolicyauth", NO_DEVELOPER, 1, trusts_cmdtrustpolicyauth, "Usage: trustpolicyauth ?1|0?\nEnables or disables policy enforcement (IAuth). Shows current status when no parameter is specified.");
 618   registercontrolhelpcmd("trustsockets", NO_DEVELOPER, 0, trusts_cmdtrustsockets, "Usage: trustsockets\nLists all currently active TRUST sockets.");
 619
 620   schedulerecurring(time(NULL)+1, 0, 5, trustdotimeout, NULL);
 621
 622   urandom = fopen("/dev/urandom", "rb");
 623   if(!urandom)
 624     Error("trusts_policy", ERR_ERROR, "Couldn't open /dev/urandom.");
 625 }
 626
 627 void _fini(void) {
 628   trustsocket *sock, *next;
 629
 630   if(countext == -1)
 631     return;
 632
 633   releasetgext(countext);
 634
 635   deregisterhook(HOOK_TRUSTS_NEWNICK, policycheck_irc);
 636   deregisterhook(HOOK_TRUSTS_LOSTNICK, policycheck_irc);
 637   deregisterhook(HOOK_CORE_REHASH, trustaccounts_rehash);
 638
 639   deregistercontrolcmd("trustpolicyirc", trusts_cmdtrustpolicyirc);
 640   deregistercontrolcmd("trustpolicyauth", trusts_cmdtrustpolicyauth);
 641   deregistercontrolcmd("trustsockets", trusts_cmdtrustsockets);
 642
 643   deleteallschedules(trustdotimeout);
 644
 645   if (urandom)
 646     fclose(urandom);
 647
 648   if (listenerfd != -1)
 649     deregisterhandler(listenerfd, 1);
 650
 651   for(sock=tslist;sock;) {
 652     next = sock->next;
 653
 654     trustkillconnection(sock, "Unloading module.");
 655     trustfreeconnection(sock, 0);
 656
 657     sock = next;
 658   }
 659 }