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
  25 #include "stdinc.h"
  26 #include "channel.h"
  27 #include "class.h"
  28 #include "client.h"
  29 #include "common.h"
  30 #include "match.h"
  31 #include "ircd.h"
  32 #include "hostmask.h"
  33 #include "numeric.h"
  34 #include "s_conf.h"
  35 #include "s_newconf.h"
  36 #include "logger.h"
  37 #include "send.h"
  38 #include "hash.h"
  39 #include "s_serv.h"
  40 #include "msg.h"
  41 #include "parse.h"
  42 #include "modules.h"
  43 #include "bandbi.h"
  44 #include "operhash.h"
  45
  46 static const char dline_desc[] = "Provides the DLINE facility to ban users via IP address";
  47
  48 static void mo_dline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  49 static void me_dline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  50 static void mo_undline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  51 static void me_undline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  52
  53 struct Message dline_msgtab = {
  54         "DLINE", 0, 0, 0, 0,
  55         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_dline, 4}, {mo_dline, 2}}
  56 };
  57
  58 struct Message undline_msgtab = {
  59         "UNDLINE", 0, 0, 0, 0,
  60         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_undline, 2}, {mo_undline, 2}}
  61 };
  62
  63 mapi_clist_av1 dline_clist[] = { &dline_msgtab, &undline_msgtab, NULL };
  64
  65 DECLARE_MODULE_AV2(dline, NULL, NULL, dline_clist, NULL, NULL, NULL, NULL, dline_desc);
  66
  67 static bool remove_temp_dline(struct ConfItem *);
  68 static void apply_dline(struct Client *, const char *, int, char *);
  69 static void apply_undline(struct Client *, const char *);
  70
  71 /* mo_dline()
  72  *
  73  *   parv[1] - dline to add
  74  *   parv[2] - reason
  75  */
  76 static void
  77 mo_dline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  78 {
  79         char def[] = "No Reason";
  80         const char *dlhost;
  81         char *reason = def;
  82         char cidr_form_host[HOSTLEN + 1];
  83         int tdline_time = 0;
  84         const char *target_server = NULL;
  85         int loc = 1;
  86
  87         if(!IsOperK(source_p))
  88         {
  89                 sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "kline");
  90                 return;
  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         loc++;
  99
 100         /* would break the protocol */
 101         if (*dlhost == ':')
 102         {
 103                 sendto_one_notice(source_p, ":Invalid D-Line");
 104                 return;
 105         }
 106
 107         if(parc >= loc + 2 && !irccmp(parv[loc], "ON"))
 108         {
 109                 if(!IsOperRemoteBan(source_p))
 110                 {
 111                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 112                                    me.name, source_p->name, "remoteban");
 113                         return;
 114                 }
 115
 116                 target_server = parv[loc + 1];
 117                 loc += 2;
 118         }
 119
 120         if(parc >= loc + 1 && !EmptyString(parv[loc]))
 121                 reason = LOCAL_COPY(parv[loc]);
 122
 123         if(target_server != NULL)
 124         {
 125                 sendto_match_servs(source_p, target_server,
 126                                    CAP_ENCAP, NOCAPS,
 127                                    "ENCAP %s DLINE %d %s :%s",
 128                                    target_server, tdline_time, dlhost, reason);
 129
 130                 if(!match(target_server, me.name))
 131                         return;
 132         }
 133
 134         apply_dline(source_p, dlhost, tdline_time, reason);
 135
 136         check_dlines();
 137 }
 138
 139 /* mo_undline()
 140  *
 141  *      parv[1] = dline to remove
 142  */
 143 static void
 144 mo_undline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 145 {
 146         const char *cidr;
 147         const char *target_server = NULL;
 148
 149         if(!IsOperK(source_p))
 150         {
 151                 sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "unkline");
 152                 return;
 153         }
 154
 155         cidr = parv[1];
 156
 157         if(parc >= 4 && !irccmp(parv[2], "ON"))
 158         {
 159                 if(!IsOperRemoteBan(source_p))
 160                 {
 161                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 162                                    me.name, source_p->name, "remoteban");
 163                         return;
 164                 }
 165
 166                 target_server = parv[3];
 167                 sendto_match_servs(source_p, target_server,
 168                                    CAP_ENCAP, NOCAPS, "ENCAP %s UNDLINE %s", target_server, cidr);
 169
 170                 if(!match(target_server, me.name))
 171                         return;
 172         }
 173
 174         apply_undline(source_p, cidr);
 175 }
 176
 177 static void
 178 me_dline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 179 {
 180         int tdline_time = atoi(parv[1]);
 181         /* Since this is coming over a server link, assume that the originating
 182          * server did the relevant permission/sanity checks...
 183          */
 184
 185         if(!IsPerson(source_p))
 186                 return;
 187
 188         if(!find_shared_conf(source_p->username, source_p->host,
 189                              source_p->servptr->name,
 190                              tdline_time > 0 ? SHARED_TDLINE : SHARED_PDLINE))
 191                 return;
 192
 193         apply_dline(source_p, parv[2], tdline_time, LOCAL_COPY(parv[3]));
 194
 195         check_dlines();
 196 }
 197
 198 static void
 199 me_undline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 200 {
 201         if(!IsPerson(source_p))
 202                 return;
 203
 204         if(!find_shared_conf(source_p->username, source_p->host,
 205                              source_p->servptr->name, SHARED_UNDLINE))
 206                 return;
 207
 208         apply_undline(source_p, parv[1]);
 209 }
 210
 211 static void
 212 apply_dline(struct Client *source_p, const char *dlhost, int tdline_time, char *reason)
 213 {
 214         struct ConfItem *aconf;
 215         char *oper_reason;
 216         struct rb_sockaddr_storage daddr;
 217         int t = AF_INET, ty, b;
 218         const char *creason;
 219
 220         ty = parse_netmask(dlhost, &daddr, &b);
 221         if(ty == HM_HOST)
 222         {
 223                 sendto_one(source_p, ":%s NOTICE %s :Invalid D-Line", me.name, source_p->name);
 224                 return;
 225         }
 226 #ifdef RB_IPV6
 227         if(ty == HM_IPV6)
 228                 t = AF_INET6;
 229         else
 230 #endif
 231                 t = AF_INET;
 232
 233         /* This means dlines wider than /16 cannot be set remotely */
 234         if(IsOperAdmin(source_p))
 235         {
 236                 if(b < 8)
 237                 {
 238                         sendto_one_notice(source_p,
 239                                           ":For safety, bitmasks less than 8 require conf access.");
 240                         return;
 241                 }
 242         }
 243         else
 244         {
 245                 if(b < 16)
 246                 {
 247                         sendto_one_notice(source_p,
 248                                           ":Dline bitmasks less than 16 are for admins only.");
 249                         return;
 250                 }
 251         }
 252
 253         if(ConfigFileEntry.non_redundant_klines)
 254         {
 255                 if((aconf = find_dline((struct sockaddr *) &daddr, t)) != NULL)
 256                 {
 257                         int bx;
 258                         parse_netmask(aconf->host, NULL, &bx);
 259                         if(b >= bx)
 260                         {
 261                                 creason = aconf->passwd ? aconf->passwd : "<No Reason>";
 262                                 if(IsConfExemptKline(aconf))
 263                                         sendto_one(source_p,
 264                                                    ":%s NOTICE %s :[%s] is (E)d-lined by [%s] - %s",
 265                                                    me.name, source_p->name, dlhost, aconf->host,
 266                                                    creason);
 267                                 else
 268                                         sendto_one(source_p,
 269                                                    ":%s NOTICE %s :[%s] already D-lined by [%s] - %s",
 270                                                    me.name, source_p->name, dlhost, aconf->host,
 271                                                    creason);
 272                                 return;
 273                         }
 274                 }
 275         }
 276
 277         rb_set_time();
 278
 279         aconf = make_conf();
 280         aconf->status = CONF_DLINE;
 281         aconf->created = rb_current_time();
 282         aconf->host = rb_strdup(dlhost);
 283         aconf->passwd = rb_strdup(reason);
 284         aconf->info.oper = operhash_add(get_oper_name(source_p));
 285
 286         if(strlen(reason) > BANREASONLEN)
 287                 reason[BANREASONLEN] = '\0';
 288
 289         /* Look for an oper reason */
 290         if((oper_reason = strchr(reason, '|')) != NULL)
 291         {
 292                 *oper_reason = '\0';
 293                 oper_reason++;
 294
 295                 if(!EmptyString(oper_reason))
 296                         aconf->spasswd = rb_strdup(oper_reason);
 297         }
 298
 299         if(tdline_time > 0)
 300         {
 301                 aconf->hold = rb_current_time() + tdline_time;
 302                 add_temp_dline(aconf);
 303
 304                 if(EmptyString(oper_reason))
 305                 {
 306                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 307                                                "%s added temporary %d min. D-Line for [%s] [%s]",
 308                                                get_oper_name(source_p), tdline_time / 60,
 309                                                aconf->host, reason);
 310                         ilog(L_KLINE, "D %s %d %s %s",
 311                              get_oper_name(source_p), tdline_time / 60, aconf->host, reason);
 312                 }
 313                 else
 314                 {
 315                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 316                                                "%s added temporary %d min. D-Line for [%s] [%s|%s]",
 317                                                get_oper_name(source_p), tdline_time / 60,
 318                                                aconf->host, reason, oper_reason);
 319                         ilog(L_KLINE, "D %s %d %s %s|%s",
 320                              get_oper_name(source_p), tdline_time / 60,
 321                              aconf->host, reason, oper_reason);
 322                 }
 323
 324                 sendto_one(source_p, ":%s NOTICE %s :Added temporary %d min. D-Line for [%s]",
 325                            me.name, source_p->name, tdline_time / 60, aconf->host);
 326         }
 327         else
 328         {
 329                 add_conf_by_address(aconf->host, CONF_DLINE, NULL, NULL, aconf);
 330
 331                 bandb_add(BANDB_DLINE, source_p, aconf->host, NULL,
 332                           reason, EmptyString(aconf->spasswd) ? NULL : aconf->spasswd, 0);
 333
 334                 if(EmptyString(oper_reason))
 335                 {
 336                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 337                                                "%s added D-Line for [%s] [%s]",
 338                                                get_oper_name(source_p), aconf->host, reason);
 339                         ilog(L_KLINE, "D %s 0 %s %s",
 340                              get_oper_name(source_p), aconf->host, reason);
 341                 }
 342                 else
 343                 {
 344                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 345                                                "%s added D-Line for [%s] [%s|%s]",
 346                                                get_oper_name(source_p), aconf->host, reason, oper_reason);
 347                         ilog(L_KLINE, "D %s 0 %s %s|%s",
 348                              get_oper_name(source_p),
 349                              aconf->host, reason, oper_reason);
 350                 }
 351         }
 352 }
 353
 354 static void
 355 apply_undline(struct Client *source_p, const char *cidr)
 356 {
 357         char buf[BUFSIZE];
 358         struct ConfItem *aconf;
 359
 360         if(parse_netmask(cidr, NULL, NULL) == HM_HOST)
 361         {
 362                 sendto_one_notice(source_p, ":Invalid D-Line");
 363                 return;
 364         }
 365
 366         aconf = find_exact_conf_by_address(cidr, CONF_DLINE, NULL);
 367         if(aconf == NULL)
 368         {
 369                 sendto_one_notice(source_p, ":No D-Line for %s", cidr);
 370                 return;
 371         }
 372
 373         rb_strlcpy(buf, aconf->host, sizeof buf);
 374         if(remove_temp_dline(aconf))
 375         {
 376                 sendto_one(source_p,
 377                            ":%s NOTICE %s :Un-dlined [%s] from temporary D-lines",
 378                            me.name, source_p->name, buf);
 379                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 380                                        "%s has removed the temporary D-Line for: [%s]",
 381                                        get_oper_name(source_p), buf);
 382                 ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), buf);
 383                 return;
 384         }
 385
 386         bandb_del(BANDB_DLINE, aconf->host, NULL);
 387
 388         sendto_one(source_p, ":%s NOTICE %s :D-Line for [%s] is removed", me.name, source_p->name,
 389                    aconf->host);
 390         sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s has removed the D-Line for: [%s]",
 391                                get_oper_name(source_p), aconf->host);
 392         ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), aconf->host);
 393         delete_one_address_conf(aconf->host, aconf);
 394 }
 395
 396 /* remove_temp_dline()
 397  *
 398  * inputs       - confitem to undline
 399  * outputs      - true if removed, false otherwise.
 400  * side effects - tries to undline anything that matches
 401  */
 402 static bool
 403 remove_temp_dline(struct ConfItem *aconf)
 404 {
 405         rb_dlink_node *ptr;
 406         int i;
 407
 408         for(i = 0; i < LAST_TEMP_TYPE; i++)
 409         {
 410                 RB_DLINK_FOREACH(ptr, temp_dlines[i].head)
 411                 {
 412                         if(aconf == ptr->data)
 413                         {
 414                                 rb_dlinkDestroy(ptr, &temp_dlines[i]);
 415                                 delete_one_address_conf(aconf->host, aconf);
 416                                 return true;
 417                         }
 418                 }
 419         }
 420
 421         return false;
 422 }