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 "client.h"
  33 #include "common.h"
  34 #include "config.h"
  35 #include "ircd.h"
  36 #include "match.h"
  37 #include "s_conf.h"
  38 #include "s_newconf.h"
  39 #include "msg.h"
  40 #include "modules.h"
  41 #include "hash.h"
  42 #include "s_serv.h"
  43 #include "operhash.h"
  44 #include "reject.h"
  45 #include "hostmask.h"
  46
  47 static int ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  48
  49 struct Message ban_msgtab = {
  50         "BAN", 0, 0, 0, MFLG_SLOW,
  51         {mg_unreg, mg_ignore, {ms_ban, 9}, {ms_ban, 9}, mg_ignore, mg_ignore}
  52 };
  53
  54 mapi_clist_av1 ban_clist[] =  { &ban_msgtab, NULL };
  55 DECLARE_MODULE_AV1(ban, NULL, NULL, ban_clist, NULL, NULL, "$Revision: 1349 $");
  56
  57 /* ms_ban()
  58  *
  59  * parv[1] - type
  60  * parv[2] - username mask or *
  61  * parv[3] - hostname mask
  62  * parv[4] - creation TS
  63  * parv[5] - duration (relative to creation)
  64  * parv[6] - lifetime (relative to creation)
  65  * parv[7] - oper or *
  66  * parv[8] - reason (possibly with |operreason)
  67  */
  68 static int
  69 ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  70 {
  71         rb_dlink_node *ptr;
  72         struct ConfItem *aconf;
  73         unsigned int ntype;
  74         const char *oper, *stype;
  75         time_t created, hold, lifetime;
  76         char *p;
  77         int act;
  78
  79         if (strlen(parv[1]) != 1)
  80         {
  81                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  82                                 "Unknown BAN type %s from %s",
  83                                 parv[1], source_p->name);
  84                 return 0;
  85         }
  86         switch (parv[1][0])
  87         {
  88                 case 'K':
  89                         ntype = CONF_KILL;
  90                         stype = "K-Line";
  91                         break;
  92                 case 'X':
  93                         ntype = CONF_XLINE;
  94                         stype = "X-Line";
  95                         break;
  96                 default:
  97                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  98                                         "Unknown BAN type %s from %s",
  99                                         parv[1], source_p->name);
 100                         return 0;
 101         }
 102         created = atol(parv[4]);
 103         hold = created + atoi(parv[5]);
 104         lifetime = created + atoi(parv[6]);
 105         if (!strcmp(parv[7], "*"))
 106                 oper = IsServer(source_p) ? source_p->name : get_oper_name(source_p);
 107         else
 108                 oper = parv[7];
 109         ptr = find_prop_ban(ntype, parv[2], parv[3]);
 110         if (ptr != NULL)
 111         {
 112                 aconf = ptr->data;
 113                 if (aconf->created > created ||
 114                                 (aconf->created == created &&
 115                                  aconf->lifetime >= lifetime))
 116                 {
 117                         if (IsPerson(source_p))
 118                                 sendto_one_notice(source_p,
 119                                                 ":Your %s [%s%s%s] has been superseded",
 120                                                 stype,
 121                                                 aconf->user ? aconf->user : "",
 122                                                 aconf->user ? "@" : "",
 123                                                 aconf->host);
 124                         return 0;
 125                 }
 126                 act = !(aconf->status & CONF_ILLEGAL) || (hold != created &&
 127                                 hold > rb_current_time());
 128                 if (lifetime > aconf->lifetime)
 129                         aconf->lifetime = lifetime;
 130                 /* already expired, hmm */
 131                 if (aconf->lifetime <= rb_current_time())
 132                         return 0;
 133                 deactivate_conf(aconf, ptr);
 134                 rb_free(aconf->user);
 135                 aconf->user = NULL;
 136                 rb_free(aconf->host);
 137                 aconf->host = NULL;
 138                 operhash_delete(aconf->info.oper);
 139                 aconf->info.oper = NULL;
 140                 rb_free(aconf->passwd);
 141                 aconf->passwd = NULL;
 142                 rb_free(aconf->spasswd);
 143                 aconf->spasswd = NULL;
 144         }
 145         else
 146         {
 147                 aconf = make_conf();
 148                 aconf->status = CONF_ILLEGAL | ntype;
 149                 aconf->lifetime = lifetime;
 150                 rb_dlinkAddAlloc(aconf, &prop_bans);
 151                 act = hold != created && hold > rb_current_time();
 152         }
 153         aconf->flags &= ~CONF_FLAGS_MYOPER;
 154         aconf->flags |= CONF_FLAGS_TEMPORARY;
 155         aconf->user = ntype == CONF_KILL ? rb_strdup(parv[2]) : NULL;
 156         aconf->host = rb_strdup(parv[3]);
 157         aconf->info.oper = operhash_add(oper);
 158         aconf->created = created;
 159         aconf->hold = hold;
 160         p = strchr(parv[parc - 1], '|');
 161         if (p == NULL)
 162                 aconf->passwd = rb_strdup(parv[parc - 1]);
 163         else
 164         {
 165                 aconf->passwd = rb_strndup(parv[parc - 1], p - parv[parc - 1] + 1);
 166                 aconf->spasswd = rb_strdup(p + 1);
 167         }
 168         if (act && hold != created &&
 169                         !(ntype == CONF_KILL ?
 170                                 valid_wild_card(aconf->user, aconf->host) :
 171                                 valid_wild_card_simple(aconf->host)))
 172         {
 173                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 174                                        "Ignoring global %d min. %s from %s%s%s for [%s%s%s]: too few non-wildcard characters",
 175                                        (hold - rb_current_time()) / 60,
 176                                        stype,
 177                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 178                                        strcmp(parv[7], "*") ? " on behalf of " : "",
 179                                        strcmp(parv[7], "*") ? parv[7] : "",
 180                                        aconf->user ? aconf->user : "",
 181                                        aconf->user ? "@" : "",
 182                                        aconf->host);
 183                 if(IsPerson(source_p))
 184                         sendto_one_notice(source_p,
 185                                         ":Your %s [%s%s%s] has too few non-wildcard characters",
 186                                         stype,
 187                                         aconf->user ? aconf->user : "",
 188                                         aconf->user ? "@" : "",
 189                                         aconf->host);
 190                 /* Propagate it, but do not apply it locally. */
 191         }
 192         else if (act && hold != created)
 193         {
 194                 /* Keep the notices in sync with modules/m_kline.c etc. */
 195                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 196                                        "%s added global %d min. %s%s%s for [%s%s%s] [%s]",
 197                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 198                                        (hold - rb_current_time()) / 60,
 199                                        stype,
 200                                        strcmp(parv[7], "*") ? " from " : "",
 201                                        strcmp(parv[7], "*") ? parv[7] : "",
 202                                        aconf->user ? aconf->user : "",
 203                                        aconf->user ? "@" : "",
 204                                        aconf->host,
 205                                        parv[parc - 1]);
 206                 ilog(L_KLINE, "%s %s %d %s%s%s %s", parv[1],
 207                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 208                                 (hold - rb_current_time()) / 60,
 209                                 aconf->user ? aconf->user : "",
 210                                 aconf->user ? " " : "",
 211                                 aconf->host,
 212                                 parv[parc - 1]);
 213                 aconf->status &= ~CONF_ILLEGAL;
 214         }
 215         else if (act)
 216         {
 217                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 218                                 "%s has removed the global %s for: [%s%s%s]%s%s",
 219                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 220                                 stype,
 221                                 aconf->user ? aconf->user : "",
 222                                 aconf->user ? "@" : "",
 223                                 aconf->host,
 224                                 strcmp(parv[7], "*") ? " on behalf of " : "",
 225                                 strcmp(parv[7], "*") ? parv[7] : "");
 226                 ilog(L_KLINE, "U%s %s %s%s %s", parv[1],
 227                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 228                                 aconf->user ? aconf->user : "",
 229                                 aconf->user ? " " : "",
 230                                 aconf->host);
 231         }
 232         switch (ntype)
 233         {
 234                 case CONF_KILL:
 235                         if (aconf->status & CONF_ILLEGAL)
 236                                 remove_reject_mask(aconf->user, aconf->host);
 237                         else
 238                         {
 239                                 add_conf_by_address(aconf->host, CONF_KILL, aconf->user, NULL, aconf);
 240                                 if(ConfigFileEntry.kline_delay ||
 241                                                 (IsServer(source_p) &&
 242                                                  !HasSentEob(source_p)))
 243                                 {
 244                                         if(kline_queued == 0)
 245                                         {
 246                                                 rb_event_addonce("check_klines", check_klines_event, NULL,
 247                                                                  ConfigFileEntry.kline_delay);
 248                                                 kline_queued = 1;
 249                                         }
 250                                 }
 251                                 else
 252                                         check_klines();
 253                         }
 254                         break;
 255                 case CONF_XLINE:
 256                         if (aconf->status & CONF_ILLEGAL)
 257                                 remove_reject_mask(aconf->host, NULL);
 258                         else
 259                         {
 260                                 rb_dlinkAddAlloc(aconf, &xline_conf_list);
 261                                 check_xlines();
 262                         }
 263                         break;
 264         }
 265         sendto_server(client_p, NULL, CAP_BAN|CAP_TS6, NOCAPS,
 266                         ":%s BAN %s %s %s %s %s %s %s :%s",
 267                         source_p->id,
 268                         parv[1],
 269                         parv[2],
 270                         parv[3],
 271                         parv[4],
 272                         parv[5],
 273                         parv[6],
 274                         parv[7],
 275                         parv[parc - 1]);
 276         return 0;
 277 }