modules/core/m_ban.c

   1 /*
   2  * charybdis: An advanced ircd.
   3  * m_ban.c: Propagates network bans across servers.
   4  *
   5  *  Copyright (C) 2010 Jilles Tjoelker
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are
   9  * met:
  10  *
  11  * 1.Redistributions of source code must retain the above copyright notice,
  12  *   this list of conditions and the following disclaimer.
  13  * 2.Redistributions in binary form must reproduce the above copyright
  14  *   notice, this list of conditions and the following disclaimer in the
  15  *   documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  26  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "stdinc.h"
  31 #include "send.h"
  32 #include "channel.h"
  33 #include "client.h"
  34 #include "common.h"
  35 #include "config.h"
  36 #include "ircd.h"
  37 #include "match.h"
  38 #include "s_conf.h"
  39 #include "s_newconf.h"
  40 #include "msg.h"
  41 #include "modules.h"
  42 #include "hash.h"
  43 #include "s_serv.h"
  44 #include "operhash.h"
  45 #include "reject.h"
  46 #include "hostmask.h"
  47
  48 static int m_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  49 static int ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  50
  51 struct Message ban_msgtab = {
  52         "BAN", 0, 0, 0, MFLG_SLOW,
  53         {mg_unreg, {m_ban, 0}, {ms_ban, 9}, {ms_ban, 9}, mg_ignore, {m_ban, 0}}
  54 };
  55
  56 mapi_clist_av1 ban_clist[] =  { &ban_msgtab, NULL };
  57 DECLARE_MODULE_AV1(ban, NULL, NULL, ban_clist, NULL, NULL, "$Revision: 1349 $");
  58
  59 static int
  60 m_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  61 {
  62         sendto_one_notice(source_p, ":The BAN command is not user-accessible.");
  63         sendto_one_notice(source_p, ":To ban a user from a channel, see /QUOTE HELP CMODE");
  64         if (IsOper(source_p))
  65                 sendto_one_notice(source_p, ":To ban a user from a server or from the network, see /QUOTE HELP KLINE");
  66         return 0;
  67 }
  68
  69 /* ms_ban()
  70  *
  71  * parv[1] - type
  72  * parv[2] - username mask or *
  73  * parv[3] - hostname mask
  74  * parv[4] - creation TS
  75  * parv[5] - duration (relative to creation)
  76  * parv[6] - lifetime (relative to creation)
  77  * parv[7] - oper or *
  78  * parv[8] - reason (possibly with |operreason)
  79  */
  80 static int
  81 ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  82 {
  83         rb_dlink_node *ptr;
  84         struct ConfItem *aconf;
  85         unsigned int ntype;
  86         const char *oper, *stype;
  87         time_t created, hold, lifetime;
  88         char *p;
  89         int act;
  90         int valid;
  91
  92         if (strlen(parv[1]) != 1)
  93         {
  94                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  95                                 "Unknown BAN type %s from %s",
  96                                 parv[1], source_p->name);
  97                 return 0;
  98         }
  99         switch (parv[1][0])
 100         {
 101                 case 'K':
 102                         ntype = CONF_KILL;
 103                         stype = "K-Line";
 104                         break;
 105                 case 'X':
 106                         ntype = CONF_XLINE;
 107                         stype = "X-Line";
 108                         break;
 109                 case 'R':
 110                         ntype = IsChannelName(parv[3]) ? CONF_RESV_CHANNEL :
 111                                 CONF_RESV_NICK;
 112                         stype = "RESV";
 113                         break;
 114                 default:
 115                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 116                                         "Unknown BAN type %s from %s",
 117                                         parv[1], source_p->name);
 118                         return 0;
 119         }
 120         created = atol(parv[4]);
 121         hold = created + atoi(parv[5]);
 122         lifetime = created + atoi(parv[6]);
 123         if (!strcmp(parv[7], "*"))
 124                 oper = IsServer(source_p) ? source_p->name : get_oper_name(source_p);
 125         else
 126                 oper = parv[7];
 127         ptr = find_prop_ban(ntype, parv[2], parv[3]);
 128         if (ptr != NULL)
 129         {
 130                 /* We already know about this ban mask. */
 131                 aconf = ptr->data;
 132                 if (aconf->created > created ||
 133                                 (aconf->created == created &&
 134                                  aconf->lifetime >= lifetime))
 135                 {
 136                         if (IsPerson(source_p))
 137                                 sendto_one_notice(source_p,
 138                                                 ":Your %s [%s%s%s] has been superseded",
 139                                                 stype,
 140                                                 aconf->user ? aconf->user : "",
 141                                                 aconf->user ? "@" : "",
 142                                                 aconf->host);
 143                         return 0;
 144                 }
 145                 /* act indicates if something happened (from the oper's
 146                  * point of view). This is the case if the ban was
 147                  * previously active (not deleted) or if the new ban
 148                  * is not a removal and not already expired.
 149                  */
 150                 act = !(aconf->status & CONF_ILLEGAL) || (hold != created &&
 151                                 hold > rb_current_time());
 152                 if (lifetime > aconf->lifetime)
 153                         aconf->lifetime = lifetime;
 154                 /* already expired, hmm */
 155                 if (aconf->lifetime <= rb_current_time())
 156                         return 0;
 157                 /* Deactivate, it will be reactivated later if appropriate. */
 158                 deactivate_conf(aconf, ptr);
 159                 rb_free(aconf->user);
 160                 aconf->user = NULL;
 161                 rb_free(aconf->host);
 162                 aconf->host = NULL;
 163                 operhash_delete(aconf->info.oper);
 164                 aconf->info.oper = NULL;
 165                 rb_free(aconf->passwd);
 166                 aconf->passwd = NULL;
 167                 rb_free(aconf->spasswd);
 168                 aconf->spasswd = NULL;
 169         }
 170         else
 171         {
 172                 /* New ban mask. */
 173                 aconf = make_conf();
 174                 aconf->status = CONF_ILLEGAL | ntype;
 175                 aconf->lifetime = lifetime;
 176                 rb_dlinkAddAlloc(aconf, &prop_bans);
 177                 act = hold != created && hold > rb_current_time();
 178         }
 179         aconf->flags &= ~CONF_FLAGS_MYOPER;
 180         aconf->flags |= CONF_FLAGS_TEMPORARY;
 181         aconf->user = ntype == CONF_KILL ? rb_strdup(parv[2]) : NULL;
 182         aconf->host = rb_strdup(parv[3]);
 183         aconf->info.oper = operhash_add(oper);
 184         aconf->created = created;
 185         aconf->hold = hold;
 186         if (ntype != CONF_KILL || (p = strchr(parv[parc - 1], '|')) == NULL)
 187                 aconf->passwd = rb_strdup(parv[parc - 1]);
 188         else
 189         {
 190                 aconf->passwd = rb_strndup(parv[parc - 1], p - parv[parc - 1] + 1);
 191                 aconf->spasswd = rb_strdup(p + 1);
 192         }
 193         /* The ban is fully filled in and in the prop_bans list
 194          * but still deactivated. Now determine if it should be activated
 195          * and send the server notices.
 196          */
 197         /* We only reject *@* and the like here.
 198          * Otherwise malformed bans are fairly harmless and can be removed.
 199          */
 200         switch (ntype)
 201         {
 202                 case CONF_KILL:
 203                         valid = valid_wild_card(aconf->user, aconf->host);
 204                         break;
 205                 case CONF_RESV_CHANNEL:
 206                         valid = 1;
 207                         break;
 208                 default:
 209                         valid = valid_wild_card_simple(aconf->host);
 210                         break;
 211         }
 212         if (act && hold != created && !valid)
 213         {
 214                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 215                                        "Ignoring global %d min. %s from %s%s%s for [%s%s%s]: too few non-wildcard characters",
 216                                        (int)((hold - rb_current_time()) / 60),
 217                                        stype,
 218                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 219                                        strcmp(parv[7], "*") ? " on behalf of " : "",
 220                                        strcmp(parv[7], "*") ? parv[7] : "",
 221                                        aconf->user ? aconf->user : "",
 222                                        aconf->user ? "@" : "",
 223                                        aconf->host);
 224                 if(IsPerson(source_p))
 225                         sendto_one_notice(source_p,
 226                                         ":Your %s [%s%s%s] has too few non-wildcard characters",
 227                                         stype,
 228                                         aconf->user ? aconf->user : "",
 229                                         aconf->user ? "@" : "",
 230                                         aconf->host);
 231                 /* Propagate it, but do not apply it locally. */
 232         }
 233         else if (act && hold != created)
 234         {
 235                 /* Keep the notices in sync with modules/m_kline.c etc. */
 236                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 237                                        "%s added global %d min. %s%s%s for [%s%s%s] [%s]",
 238                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 239                                        (int)((hold - rb_current_time()) / 60),
 240                                        stype,
 241                                        strcmp(parv[7], "*") ? " from " : "",
 242                                        strcmp(parv[7], "*") ? parv[7] : "",
 243                                        aconf->user ? aconf->user : "",
 244                                        aconf->user ? "@" : "",
 245                                        aconf->host,
 246                                        parv[parc - 1]);
 247                 ilog(L_KLINE, "%s %s %d %s%s%s %s", parv[1],
 248                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 249                                 (int)((hold - rb_current_time()) / 60),
 250                                 aconf->user ? aconf->user : "",
 251                                 aconf->user ? " " : "",
 252                                 aconf->host,
 253                                 parv[parc - 1]);
 254                 aconf->status &= ~CONF_ILLEGAL;
 255         }
 256         else if (act)
 257         {
 258                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 259                                 "%s has removed the global %s for: [%s%s%s]%s%s",
 260                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 261                                 stype,
 262                                 aconf->user ? aconf->user : "",
 263                                 aconf->user ? "@" : "",
 264                                 aconf->host,
 265                                 strcmp(parv[7], "*") ? " on behalf of " : "",
 266                                 strcmp(parv[7], "*") ? parv[7] : "");
 267                 ilog(L_KLINE, "U%s %s %s%s %s", parv[1],
 268                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 269                                 aconf->user ? aconf->user : "",
 270                                 aconf->user ? " " : "",
 271                                 aconf->host);
 272         }
 273         /* If CONF_ILLEGAL is still set at this point, remove entries from the
 274          * reject cache (for klines and xlines).
 275          * If CONF_ILLEGAL is not set, add the ban to the type-specific data
 276          * structure and take action on matched clients/channels.
 277          */
 278         switch (ntype)
 279         {
 280                 case CONF_KILL:
 281                         if (aconf->status & CONF_ILLEGAL)
 282                                 remove_reject_mask(aconf->user, aconf->host);
 283                         else
 284                         {
 285                                 add_conf_by_address(aconf->host, CONF_KILL, aconf->user, NULL, aconf);
 286                                 if(ConfigFileEntry.kline_delay ||
 287                                                 (IsServer(source_p) &&
 288                                                  !HasSentEob(source_p)))
 289                                 {
 290                                         if(kline_queued == 0)
 291                                         {
 292                                                 rb_event_addonce("check_klines", check_klines_event, NULL,
 293                                                                  ConfigFileEntry.kline_delay);
 294                                                 kline_queued = 1;
 295                                         }
 296                                 }
 297                                 else
 298                                         check_klines();
 299                         }
 300                         break;
 301                 case CONF_XLINE:
 302                         if (aconf->status & CONF_ILLEGAL)
 303                                 remove_reject_mask(aconf->host, NULL);
 304                         else
 305                         {
 306                                 rb_dlinkAddAlloc(aconf, &xline_conf_list);
 307                                 check_xlines();
 308                         }
 309                         break;
 310                 case CONF_RESV_CHANNEL:
 311                         if (!(aconf->status & CONF_ILLEGAL))
 312                         {
 313                                 add_to_resv_hash(aconf->host, aconf);
 314                                 resv_chan_forcepart(aconf->host, aconf->passwd, hold - rb_current_time());
 315                         }
 316                         break;
 317                 case CONF_RESV_NICK:
 318                         if (!(aconf->status & CONF_ILLEGAL))
 319                                 rb_dlinkAddAlloc(aconf, &resv_conf_list);
 320                         break;
 321         }
 322         sendto_server(client_p, NULL, CAP_BAN|CAP_TS6, NOCAPS,
 323                         ":%s BAN %s %s %s %s %s %s %s :%s",
 324                         source_p->id,
 325                         parv[1],
 326                         parv[2],
 327                         parv[3],
 328                         parv[4],
 329                         parv[5],
 330                         parv[6],
 331                         parv[7],
 332                         parv[parc - 1]);
 333         return 0;
 334 }