modules/m_dline.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_dline.c: Bans/unbans a user.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: m_dline.c 3225 2007-03-04 23:42:55Z jilles $
  25  */
  26
  27 #include "stdinc.h"
  28 #include "channel.h"
  29 #include "class.h"
  30 #include "client.h"
  31 #include "common.h"
  32 #include "match.h"
  33 #include "ircd.h"
  34 #include "hostmask.h"
  35 #include "numeric.h"
  36 #include "s_conf.h"
  37 #include "s_newconf.h"
  38 #include "logger.h"
  39 #include "send.h"
  40 #include "hash.h"
  41 #include "s_serv.h"
  42 #include "msg.h"
  43 #include "parse.h"
  44 #include "modules.h"
  45
  46 static int mo_dline(struct Client *, struct Client *, int, const char **);
  47 static int me_dline(struct Client *, struct Client *, int, const char **);
  48 static int mo_undline(struct Client *, struct Client *, int, const char **);
  49 static int me_undline(struct Client *, struct Client *, int, const char **);
  50
  51 struct Message dline_msgtab = {
  52         "DLINE", 0, 0, 0, MFLG_SLOW,
  53         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_dline, 3}, {mo_dline, 2}}
  54 };
  55 struct Message undline_msgtab = {
  56         "UNDLINE", 0, 0, 0, MFLG_SLOW,
  57         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_undline, 1}, {mo_undline, 2}}
  58 };
  59
  60 mapi_clist_av1 dline_clist[] = { &dline_msgtab, &undline_msgtab, NULL };
  61 DECLARE_MODULE_AV1(dline, NULL, NULL, dline_clist, NULL, NULL, "$Revision: 3225 $");
  62
  63 static int valid_comment(char *comment);
  64 static int flush_write(struct Client *, FILE *, char *, char *);
  65 static int remove_temp_dline(struct ConfItem *);
  66 static int apply_dline(struct Client *, const char *, int, char *);
  67 static int apply_undline(struct Client *, const char *);
  68
  69 /* mo_dline()
  70  *
  71  *   parv[1] - dline to add
  72  *   parv[2] - reason
  73  */
  74 static int
  75 mo_dline(struct Client *client_p, struct Client *source_p,
  76          int parc, const char *parv[])
  77 {
  78         char def[] = "No Reason";
  79         const char *dlhost;
  80         char *reason = def;
  81         char cidr_form_host[HOSTLEN + 1];
  82         int tdline_time = 0;
  83         const char *target_server = NULL;
  84         int loc = 1;
  85
  86         if(!IsOperK(source_p))
  87         {
  88                 sendto_one(source_p, form_str(ERR_NOPRIVS),
  89                            me.name, source_p->name, "kline");
  90                 return 0;
  91         }
  92
  93         if((tdline_time = valid_temp_time(parv[loc])) >= 0)
  94                 loc++;
  95
  96         dlhost = parv[loc];
  97         rb_strlcpy(cidr_form_host, dlhost, sizeof(cidr_form_host));
  98
  99         loc++;
 100
 101         if(parc >= loc+2 && !irccmp(parv[loc], "ON"))
 102         {
 103                 target_server = parv[loc+1];
 104                 loc += 2;
 105         }
 106
 107         if(parc >= loc + 1 && !EmptyString(parv[loc]))
 108                 reason = LOCAL_COPY(parv[loc]);
 109
 110         if(target_server != NULL)
 111         {
 112                 sendto_match_servs(source_p, target_server,
 113                                 CAP_ENCAP, NOCAPS,
 114                                 "ENCAP %s DLINE %d %s :%s",
 115                                 target_server, tdline_time, dlhost, reason);
 116
 117                 if(!match(target_server, me.name))
 118                         return 0;
 119         }
 120
 121         apply_dline(source_p, dlhost, tdline_time, reason);
 122
 123         check_dlines();
 124         return 0;
 125 }
 126
 127 /* mo_undline()
 128  *
 129  *      parv[1] = dline to remove
 130  */
 131 static int
 132 mo_undline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 133 {
 134         const char *cidr;
 135         const char *target_server = NULL;
 136
 137         if(!IsOperK(source_p))
 138         {
 139                 sendto_one(source_p, form_str(ERR_NOPRIVS),
 140                            me.name, source_p->name, "unkline");
 141                 return 0;
 142         }
 143
 144         cidr = parv[1];
 145
 146         if(parc >= 4 && !irccmp(parv[2], "ON"))
 147         {
 148                 target_server = parv[3];
 149                 sendto_match_servs(source_p, target_server,
 150                                 CAP_ENCAP, NOCAPS,
 151                                 "ENCAP %s UNDLINE %s",
 152                                 target_server, cidr);
 153
 154                 if(!match(target_server, me.name))
 155                         return 0;
 156         }
 157
 158         apply_undline(source_p, cidr);
 159
 160         return 0;
 161 }
 162
 163 static int
 164 me_dline(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 165 {
 166         int tdline_time = atoi(parv[1]);
 167         /* Since this is coming over a server link, assume that the originating
 168          * server did the relevant permission/sanity checks...
 169          */
 170
 171         if(!IsPerson(source_p))
 172                 return 0;
 173
 174         if(!find_shared_conf(source_p->username, source_p->host,
 175                                 source_p->servptr->name, tdline_time > 0 ? SHARED_TDLINE : SHARED_PDLINE))
 176                 return 0;
 177
 178         apply_dline(source_p, parv[2], tdline_time, LOCAL_COPY(parv[3]));
 179
 180         check_dlines();
 181         return 0;
 182 }
 183
 184 static int
 185 me_undline(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 186 {
 187         if(!IsPerson(source_p))
 188                 return 0;
 189
 190         if(!find_shared_conf(source_p->username, source_p->host,
 191                                 source_p->servptr->name, SHARED_UNDLINE))
 192                 return 0;
 193
 194         apply_undline(source_p, parv[1]);
 195
 196         return 0;
 197 }
 198
 199 static int
 200 apply_dline(struct Client *source_p, const char *dlhost, int tdline_time, char *reason)
 201 {
 202         struct ConfItem *aconf;
 203         char *oper_reason;
 204         char dlbuffer[IRCD_BUFSIZE];
 205         const char *current_date;
 206         struct rb_sockaddr_storage daddr;
 207         int t = AF_INET, ty, b;
 208         const char *creason;
 209
 210         ty = parse_netmask(dlhost, (struct sockaddr *)&daddr, &b);
 211         if(ty == HM_HOST)
 212         {
 213                 sendto_one(source_p, ":%s NOTICE %s :Invalid D-Line",
 214                            me.name, source_p->name);
 215                 return 0;
 216         }
 217 #ifdef RB_IPV6
 218         if(ty == HM_IPV6)
 219                 t = AF_INET6;
 220         else
 221 #endif
 222                 t = AF_INET;
 223
 224         /* This means dlines wider than /16 cannot be set remotely */
 225         if(IsOperAdmin(source_p))
 226         {
 227                 if(b < 8)
 228                 {
 229                         sendto_one_notice(source_p,
 230                                    ":For safety, bitmasks less than 8 require conf access.");
 231                         return 0;
 232                 }
 233         }
 234         else
 235         {
 236                 if(b < 16)
 237                 {
 238                         sendto_one_notice(source_p,
 239                                    ":Dline bitmasks less than 16 are for admins only.");
 240                         return 0;
 241                 }
 242         }
 243
 244         if(!valid_comment(reason))
 245         {
 246                 sendto_one(source_p,
 247                            ":%s NOTICE %s :Invalid character '\"' in comment",
 248                            me.name, source_p->name);
 249                 return 0;
 250         }
 251
 252         /* Look for an oper reason */
 253         if((oper_reason = strchr(reason, '|')) != NULL)
 254         {
 255                 *oper_reason = '\0';
 256                 oper_reason++;
 257
 258                 if(!EmptyString(oper_reason))
 259                         aconf->spasswd = rb_strdup(oper_reason);
 260         }
 261
 262         if(ConfigFileEntry.non_redundant_klines)
 263         {
 264                 if((aconf = find_dline((struct sockaddr *)&daddr, t)) != NULL)
 265                 {
 266                         int bx;
 267                         parse_netmask(aconf->host, NULL, &bx);
 268                         if(b >= bx)
 269                         {
 270                                 creason = aconf->passwd ? aconf->passwd : "<No Reason>";
 271                                 if(IsConfExemptKline(aconf))
 272                                         sendto_one(source_p,
 273                                                    ":%s NOTICE %s :[%s] is (E)d-lined by [%s] - %s",
 274                                                    me.name, source_p->name, dlhost, aconf->host, creason);
 275                                 else
 276                                         sendto_one(source_p,
 277                                                    ":%s NOTICE %s :[%s] already D-lined by [%s] - %s",
 278                                                    me.name, source_p->name, dlhost, aconf->host, creason);
 279                                 return 0;
 280                         }
 281                 }
 282         }
 283
 284         rb_set_time();
 285         current_date = smalldate();
 286
 287         aconf = make_conf();
 288         aconf->status = CONF_DLINE;
 289         aconf->host = rb_strdup(dlhost);
 290
 291         if(tdline_time > 0)
 292         {
 293                 rb_snprintf(dlbuffer, sizeof(dlbuffer),
 294                          "Temporary D-line %d min. - %s (%s)",
 295                          (int) (tdline_time / 60), reason, current_date);
 296                 aconf->passwd = rb_strdup(dlbuffer);
 297                 aconf->hold = rb_current_time() + tdline_time;
 298                 add_temp_dline(aconf);
 299
 300                 if(EmptyString(oper_reason))
 301                 {
 302                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 303                                              "%s added temporary %d min. D-Line for [%s] [%s]",
 304                                              get_oper_name(source_p), tdline_time / 60,
 305                                              aconf->host, reason);
 306                         ilog(L_KLINE, "D %s %d %s %s",
 307                                 get_oper_name(source_p), tdline_time / 60,
 308                                 aconf->host, reason);
 309                 }
 310                 else
 311                 {
 312                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 313                                              "%s added temporary %d min. D-Line for [%s] [%s|%s]",
 314                                              get_oper_name(source_p), tdline_time / 60,
 315                                              aconf->host, reason, oper_reason);
 316                         ilog(L_KLINE, "D %s %d %s %s|%s",
 317                                 get_oper_name(source_p), tdline_time / 60,
 318                                 aconf->host, reason, oper_reason);
 319                 }
 320
 321                 sendto_one(source_p, ":%s NOTICE %s :Added temporary %d min. D-Line for [%s]",
 322                            me.name, source_p->name, tdline_time / 60, aconf->host);
 323         }
 324         else
 325         {
 326                 rb_snprintf(dlbuffer, sizeof(dlbuffer), "%s (%s)", reason, current_date);
 327                 aconf->passwd = rb_strdup(dlbuffer);
 328                 add_conf_by_address(aconf->host, CONF_DLINE, NULL, aconf);
 329                 write_confitem(DLINE_TYPE, source_p, NULL, aconf->host, reason,
 330                                oper_reason, current_date, 0);
 331         }
 332
 333         return 0;
 334 }
 335
 336 static int
 337 apply_undline(struct Client *source_p, const char *cidr)
 338 {
 339         FILE *in;
 340         FILE *out;
 341         char buf[BUFSIZE], buff[BUFSIZE], temppath[BUFSIZE], *p;
 342         const char *filename, *found_cidr;
 343         int pairme = NO, error_on_write = NO;
 344         mode_t oldumask;
 345         struct ConfItem *aconf;
 346
 347         if(parse_netmask(cidr, NULL, NULL) == HM_HOST)
 348         {
 349                 sendto_one_notice(source_p, ":Invalid D-Line");
 350                 return 0;
 351         }
 352
 353         rb_snprintf(temppath, sizeof(temppath), "%s.tmp", ConfigFileEntry.dlinefile);
 354
 355         aconf = find_exact_conf_by_address(cidr, CONF_DLINE, NULL);
 356         if(aconf == NULL)
 357         {
 358                 sendto_one_notice(source_p, ":No D-Line for %s", cidr);
 359                 return 0;
 360         }
 361
 362         rb_strlcpy(buf, aconf->host, sizeof buf);
 363         if(remove_temp_dline(aconf))
 364         {
 365                 sendto_one(source_p,
 366                            ":%s NOTICE %s :Un-dlined [%s] from temporary D-lines",
 367                            me.name, source_p->name, buf);
 368                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 369                                      "%s has removed the temporary D-Line for: [%s]",
 370                                      get_oper_name(source_p), buf);
 371                 ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), buf);
 372                 return 0;
 373         }
 374
 375         filename = get_conf_name(DLINE_TYPE);
 376
 377         if((in = fopen(filename, "r")) == 0)
 378         {
 379                 sendto_one(source_p, ":%s NOTICE %s :Cannot open %s", me.name, source_p->name, filename);
 380                 return 0;
 381         }
 382
 383         oldumask = umask(0);
 384         if((out = fopen(temppath, "w")) == 0)
 385         {
 386                 sendto_one(source_p, ":%s NOTICE %s :Cannot open %s", me.name, source_p->name, temppath);
 387                 fclose(in);
 388                 umask(oldumask);
 389                 return 0;
 390         }
 391
 392         umask(oldumask);
 393
 394         while (fgets(buf, sizeof(buf), in))
 395         {
 396                 rb_strlcpy(buff, buf, sizeof(buff));
 397
 398                 if((p = strchr(buff, '\n')) != NULL)
 399                         *p = '\0';
 400
 401                 if((*buff == '\0') || (*buff == '#'))
 402                 {
 403                         if(!error_on_write)
 404                                 flush_write(source_p, out, buf, temppath);
 405                         continue;
 406                 }
 407
 408                 if((found_cidr = getfield(buff)) == NULL)
 409                 {
 410                         if(!error_on_write)
 411                                 flush_write(source_p, out, buf, temppath);
 412                         continue;
 413                 }
 414
 415                 if(irccmp(found_cidr, aconf->host) == 0)
 416                 {
 417                         pairme++;
 418                 }
 419                 else
 420                 {
 421                         if(!error_on_write)
 422                                 flush_write(source_p, out, buf, temppath);
 423                         continue;
 424                 }
 425         }
 426
 427         fclose(in);
 428         if (fclose(out))
 429                 error_on_write = YES;
 430
 431         if(error_on_write)
 432         {
 433                 sendto_one(source_p,
 434                            ":%s NOTICE %s :Couldn't write D-line file, aborted",
 435                            me.name, source_p->name);
 436                 return 0;
 437         }
 438         else if(!pairme)
 439         {
 440                 sendto_one_notice(source_p, ":Cannot find D-Line for %s in file",
 441                                 aconf->host);
 442
 443                 if(temppath != NULL)
 444                         (void) unlink(temppath);
 445
 446                 return 0;
 447         }
 448
 449         if (rename(temppath, filename))
 450         {
 451                 sendto_one_notice(source_p, ":Couldn't rename temp file, aborted");
 452                 return 0;
 453         }
 454
 455         sendto_one(source_p, ":%s NOTICE %s :D-Line for [%s] is removed", me.name, source_p->name, aconf->host);
 456         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 457                              "%s has removed the D-Line for: [%s]", get_oper_name(source_p), aconf->host);
 458         ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), aconf->host);
 459         delete_one_address_conf(aconf->host, aconf);
 460
 461         return 0;
 462 }
 463
 464 /*
 465  * valid_comment
 466  * inputs       - pointer to client
 467  *              - pointer to comment
 468  * output       - 0 if no valid comment, 1 if valid
 469  * side effects - NONE
 470  */
 471 static int
 472 valid_comment(char *comment)
 473 {
 474         if(strchr(comment, '"'))
 475                 return 0;
 476
 477         if(strlen(comment) > BANREASONLEN)
 478                 comment[BANREASONLEN] = '\0';
 479
 480         return 1;
 481 }
 482
 483 /*
 484  * flush_write()
 485  *
 486  * inputs       - pointer to client structure of oper requesting unkline
 487  *              - out is the file descriptor
 488  *              - buf is the buffer to write
 489  *              - ntowrite is the expected number of character to be written
 490  *              - temppath is the temporary file name to be written
 491  * output       - YES for error on write
 492  *              - NO for success
 493  * side effects - if successful, the buf is written to output file
 494  *                if a write failure happesn, and the file pointed to
 495  *                by temppath, if its non NULL, is removed.
 496  *
 497  * The idea here is, to be as robust as possible when writing to the
 498  * kline file.
 499  *
 500  * -Dianora
 501  */
 502 static int
 503 flush_write(struct Client *source_p, FILE * out, char *buf, char *temppath)
 504 {
 505         int error_on_write = (fputs(buf, out) < 0) ? YES : NO;
 506
 507         if(error_on_write)
 508         {
 509                 sendto_one_notice(source_p, ":Unable to write to %s", temppath);
 510                 fclose(out);
 511                 if(temppath != NULL)
 512                         (void) unlink(temppath);
 513         }
 514         return (error_on_write);
 515 }
 516
 517 /* remove_temp_dline()
 518  *
 519  * inputs       - confitem to undline
 520  * outputs      -
 521  * side effects - tries to undline anything that matches
 522  */
 523 static int
 524 remove_temp_dline(struct ConfItem *aconf)
 525 {
 526         rb_dlink_node *ptr;
 527         int i;
 528
 529         for (i = 0; i < LAST_TEMP_TYPE; i++)
 530         {
 531                 RB_DLINK_FOREACH(ptr, temp_dlines[i].head)
 532                 {
 533                         if (aconf == ptr->data)
 534                         {
 535                                 rb_dlinkDestroy(ptr, &temp_dlines[i]);
 536                                 delete_one_address_conf(aconf->host, aconf);
 537                                 return YES;
 538                         }
 539                 }
 540         }
 541
 542         return NO;
 543 }