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 "match.h"
  30 #include "ircd.h"
  31 #include "hostmask.h"
  32 #include "numeric.h"
  33 #include "s_conf.h"
  34 #include "s_newconf.h"
  35 #include "logger.h"
  36 #include "send.h"
  37 #include "hash.h"
  38 #include "s_serv.h"
  39 #include "msg.h"
  40 #include "parse.h"
  41 #include "modules.h"
  42 #include "bandbi.h"
  43 #include "operhash.h"
  44
  45 static const char dline_desc[] = "Provides the DLINE facility to ban users via IP address";
  46
  47 static void mo_dline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  48 static void me_dline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  49 static void mo_undline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  50 static void me_undline(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  51
  52 struct Message dline_msgtab = {
  53         "DLINE", 0, 0, 0, 0,
  54         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_dline, 4}, {mo_dline, 2}}
  55 };
  56
  57 struct Message undline_msgtab = {
  58         "UNDLINE", 0, 0, 0, 0,
  59         {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_undline, 2}, {mo_undline, 2}}
  60 };
  61
  62 mapi_clist_av1 dline_clist[] = { &dline_msgtab, &undline_msgtab, NULL };
  63
  64 DECLARE_MODULE_AV2(dline, NULL, NULL, dline_clist, NULL, NULL, NULL, NULL, dline_desc);
  65
  66 static bool remove_temp_dline(struct ConfItem *);
  67 static void apply_dline(struct Client *, const char *, int, char *);
  68 static void apply_undline(struct Client *, const char *);
  69
  70 /* mo_dline()
  71  *
  72  *   parv[1] - dline to add
  73  *   parv[2] - reason
  74  */
  75 static void
  76 mo_dline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, 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), me.name, source_p->name, "kline");
  89                 return;
  90         }
  91
  92         if((tdline_time = valid_temp_time(parv[loc])) >= 0)
  93                 loc++;
  94
  95         dlhost = parv[loc];
  96         rb_strlcpy(cidr_form_host, dlhost, sizeof(cidr_form_host));
  97         loc++;
  98
  99         /* would break the protocol */
 100         if (*dlhost == ':')
 101         {
 102                 sendto_one_notice(source_p, ":Invalid D-Line");
 103                 return;
 104         }
 105
 106         if(parc >= loc + 2 && !irccmp(parv[loc], "ON"))
 107         {
 108                 if(!IsOperRemoteBan(source_p))
 109                 {
 110                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 111                                    me.name, source_p->name, "remoteban");
 112                         return;
 113                 }
 114
 115                 target_server = parv[loc + 1];
 116                 loc += 2;
 117         }
 118
 119         if(parc >= loc + 1 && !EmptyString(parv[loc]))
 120                 reason = LOCAL_COPY(parv[loc]);
 121
 122         if(target_server != NULL)
 123         {
 124                 sendto_match_servs(source_p, target_server,
 125                                    CAP_ENCAP, NOCAPS,
 126                                    "ENCAP %s DLINE %d %s :%s",
 127                                    target_server, tdline_time, dlhost, reason);
 128
 129                 if(!match(target_server, me.name))
 130                         return;
 131         }
 132
 133         apply_dline(source_p, dlhost, tdline_time, reason);
 134
 135         check_dlines();
 136 }
 137
 138 /* mo_undline()
 139  *
 140  *      parv[1] = dline to remove
 141  */
 142 static void
 143 mo_undline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 144 {
 145         const char *cidr;
 146         const char *target_server = NULL;
 147
 148         if(!IsOperK(source_p))
 149         {
 150                 sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "unkline");
 151                 return;
 152         }
 153
 154         cidr = parv[1];
 155
 156         if(parc >= 4 && !irccmp(parv[2], "ON"))
 157         {
 158                 if(!IsOperRemoteBan(source_p))
 159                 {
 160                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 161                                    me.name, source_p->name, "remoteban");
 162                         return;
 163                 }
 164
 165                 target_server = parv[3];
 166                 sendto_match_servs(source_p, target_server,
 167                                    CAP_ENCAP, NOCAPS, "ENCAP %s UNDLINE %s", target_server, cidr);
 168
 169                 if(!match(target_server, me.name))
 170                         return;
 171         }
 172
 173         apply_undline(source_p, cidr);
 174 }
 175
 176 static void
 177 me_dline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 178 {
 179         int tdline_time = atoi(parv[1]);
 180         /* Since this is coming over a server link, assume that the originating
 181          * server did the relevant permission/sanity checks...
 182          */
 183
 184         if(!IsPerson(source_p))
 185                 return;
 186
 187         if(!find_shared_conf(source_p->username, source_p->host,
 188                              source_p->servptr->name,
 189                              tdline_time > 0 ? SHARED_TDLINE : SHARED_PDLINE))
 190                 return;
 191
 192         apply_dline(source_p, parv[2], tdline_time, LOCAL_COPY(parv[3]));
 193
 194         check_dlines();
 195 }
 196
 197 static void
 198 me_undline(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
 199 {
 200         if(!IsPerson(source_p))
 201                 return;
 202
 203         if(!find_shared_conf(source_p->username, source_p->host,
 204                              source_p->servptr->name, SHARED_UNDLINE))
 205                 return;
 206
 207         apply_undline(source_p, parv[1]);
 208 }
 209
 210 static void
 211 apply_dline(struct Client *source_p, const char *dlhost, int tdline_time, char *reason)
 212 {
 213         struct ConfItem *aconf;
 214         char *oper_reason;
 215         struct rb_sockaddr_storage daddr;
 216         int t = AF_INET, ty, b;
 217         const char *creason;
 218
 219         ty = parse_netmask_strict(dlhost, &daddr, &b);
 220         if(ty != HM_IPV4 && ty != HM_IPV6)
 221         {
 222                 sendto_one(source_p, ":%s NOTICE %s :Invalid D-Line", me.name, source_p->name);
 223                 return;
 224         }
 225         if(ty == HM_IPV6)
 226                 t = AF_INET6;
 227         else
 228                 t = AF_INET;
 229
 230         /* This means dlines wider than /16 cannot be set remotely */
 231         if(IsOperAdmin(source_p))
 232         {
 233                 if(b < 8)
 234                 {
 235                         sendto_one_notice(source_p,
 236                                           ":For safety, bitmasks less than 8 require conf access.");
 237                         return;
 238                 }
 239         }
 240         else
 241         {
 242                 if(b < 16)
 243                 {
 244                         sendto_one_notice(source_p,
 245                                           ":Dline bitmasks less than 16 are for admins only.");
 246                         return;
 247                 }
 248         }
 249
 250         if(ConfigFileEntry.non_redundant_klines)
 251         {
 252                 if((aconf = find_dline((struct sockaddr *) &daddr, t)) != NULL)
 253                 {
 254                         int bx;
 255                         int masktype = parse_netmask_strict(aconf->host, NULL, &bx);
 256
 257                         if (masktype != HM_ERROR && b >= bx)
 258                         {
 259                                 creason = aconf->passwd ? aconf->passwd : "<No Reason>";
 260                                 if(IsConfExemptKline(aconf))
 261                                         sendto_one(source_p,
 262                                                    ":%s NOTICE %s :[%s] is (E)d-lined by [%s] - %s",
 263                                                    me.name, source_p->name, dlhost, aconf->host,
 264                                                    creason);
 265                                 else
 266                                         sendto_one(source_p,
 267                                                    ":%s NOTICE %s :[%s] already D-lined by [%s] - %s",
 268                                                    me.name, source_p->name, dlhost, aconf->host,
 269                                                    creason);
 270                                 return;
 271                         }
 272                 }
 273         }
 274
 275         rb_set_time();
 276
 277         aconf = make_conf();
 278         aconf->status = CONF_DLINE;
 279         aconf->created = rb_current_time();
 280         aconf->host = rb_strdup(dlhost);
 281         aconf->passwd = rb_strdup(reason);
 282         aconf->info.oper = operhash_add(get_oper_name(source_p));
 283
 284         if(strlen(reason) > BANREASONLEN)
 285                 reason[BANREASONLEN] = '\0';
 286
 287         /* Look for an oper reason */
 288         if((oper_reason = strchr(reason, '|')) != NULL)
 289         {
 290                 *oper_reason = '\0';
 291                 oper_reason++;
 292
 293                 if(!EmptyString(oper_reason))
 294                         aconf->spasswd = rb_strdup(oper_reason);
 295         }
 296
 297         if(tdline_time > 0)
 298         {
 299                 aconf->hold = rb_current_time() + tdline_time;
 300                 add_temp_dline(aconf);
 301
 302                 if(EmptyString(oper_reason))
 303                 {
 304                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 305                                                "%s added temporary %d min. D-Line for [%s] [%s]",
 306                                                get_oper_name(source_p), tdline_time / 60,
 307                                                aconf->host, reason);
 308                         ilog(L_KLINE, "D %s %d %s %s",
 309                              get_oper_name(source_p), tdline_time / 60, aconf->host, reason);
 310                 }
 311                 else
 312                 {
 313                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 314                                                "%s added temporary %d min. D-Line for [%s] [%s|%s]",
 315                                                get_oper_name(source_p), tdline_time / 60,
 316                                                aconf->host, reason, oper_reason);
 317                         ilog(L_KLINE, "D %s %d %s %s|%s",
 318                              get_oper_name(source_p), tdline_time / 60,
 319                              aconf->host, reason, oper_reason);
 320                 }
 321
 322                 sendto_one(source_p, ":%s NOTICE %s :Added temporary %d min. D-Line for [%s]",
 323                            me.name, source_p->name, tdline_time / 60, aconf->host);
 324         }
 325         else
 326         {
 327                 add_conf_by_address(aconf->host, CONF_DLINE, NULL, NULL, aconf);
 328
 329                 bandb_add(BANDB_DLINE, source_p, aconf->host, NULL,
 330                           reason, EmptyString(aconf->spasswd) ? NULL : aconf->spasswd, 0);
 331
 332                 if(EmptyString(oper_reason))
 333                 {
 334                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 335                                                "%s added D-Line for [%s] [%s]",
 336                                                get_oper_name(source_p), aconf->host, reason);
 337                         ilog(L_KLINE, "D %s 0 %s %s",
 338                              get_oper_name(source_p), aconf->host, reason);
 339                 }
 340                 else
 341                 {
 342                         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 343                                                "%s added D-Line for [%s] [%s|%s]",
 344                                                get_oper_name(source_p), aconf->host, reason, oper_reason);
 345                         ilog(L_KLINE, "D %s 0 %s %s|%s",
 346                              get_oper_name(source_p),
 347                              aconf->host, reason, oper_reason);
 348                 }
 349         }
 350 }
 351
 352 static void
 353 apply_undline(struct Client *source_p, const char *cidr)
 354 {
 355         char buf[BUFSIZE];
 356         struct ConfItem *aconf;
 357
 358         int masktype = parse_netmask_strict(cidr, NULL, NULL);
 359
 360         if(masktype != HM_IPV4 && masktype != HM_IPV6)
 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 }