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 #include "logger.h"
  48
  49 static int m_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  50 static int ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  51
  52 struct Message ban_msgtab = {
  53         "BAN", 0, 0, 0, MFLG_SLOW,
  54         {mg_unreg, {m_ban, 0}, {ms_ban, 9}, {ms_ban, 9}, mg_ignore, {m_ban, 0}}
  55 };
  56
  57 mapi_clist_av1 ban_clist[] =  { &ban_msgtab, NULL };
  58 DECLARE_MODULE_AV1(ban, NULL, NULL, ban_clist, NULL, NULL, "$Revision: 1349 $");
  59
  60 static int
  61 m_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  62 {
  63         sendto_one_notice(source_p, ":The BAN command is not user-accessible.");
  64         sendto_one_notice(source_p, ":To ban a user from a channel, see /QUOTE HELP CMODE");
  65         if (IsOper(source_p))
  66                 sendto_one_notice(source_p, ":To ban a user from a server or from the network, see /QUOTE HELP KLINE");
  67         return 0;
  68 }
  69
  70 /* ms_ban()
  71  *
  72  * parv[1] - type
  73  * parv[2] - username mask or *
  74  * parv[3] - hostname mask
  75  * parv[4] - creation TS
  76  * parv[5] - duration (relative to creation)
  77  * parv[6] - lifetime (relative to creation)
  78  * parv[7] - oper or *
  79  * parv[8] - reason (possibly with |operreason)
  80  */
  81 static int
  82 ms_ban(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  83 {
  84         rb_dlink_node *ptr;
  85         struct ConfItem *aconf;
  86         unsigned int ntype;
  87         const char *oper, *stype;
  88         time_t now, created, hold, lifetime;
  89         char *p;
  90         int act;
  91         int valid;
  92
  93         now = rb_current_time();
  94         if (strlen(parv[1]) != 1)
  95         {
  96                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  97                                 "Unknown BAN type %s from %s",
  98                                 parv[1], source_p->name);
  99                 return 0;
 100         }
 101         switch (parv[1][0])
 102         {
 103                 case 'K':
 104                         ntype = CONF_KILL;
 105                         stype = "K-Line";
 106                         break;
 107                 case 'X':
 108                         ntype = CONF_XLINE;
 109                         stype = "X-Line";
 110                         break;
 111                 case 'R':
 112                         ntype = IsChannelName(parv[3]) ? CONF_RESV_CHANNEL :
 113                                 CONF_RESV_NICK;
 114                         stype = "RESV";
 115                         break;
 116                 default:
 117                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 118                                         "Unknown BAN type %s from %s",
 119                                         parv[1], source_p->name);
 120                         return 0;
 121         }
 122         created = atol(parv[4]);
 123         hold = created + atoi(parv[5]);
 124         lifetime = created + atoi(parv[6]);
 125         if (!strcmp(parv[7], "*"))
 126                 oper = IsServer(source_p) ? source_p->name : get_oper_name(source_p);
 127         else
 128                 oper = parv[7];
 129         ptr = find_prop_ban(ntype, parv[2], parv[3]);
 130         if (ptr != NULL)
 131         {
 132                 /* We already know about this ban mask. */
 133                 aconf = ptr->data;
 134                 if (aconf->created > created ||
 135                                 (aconf->created == created &&
 136                                  aconf->lifetime >= lifetime))
 137                 {
 138                         if (IsPerson(source_p))
 139                                 sendto_one_notice(source_p,
 140                                                 ":Your %s [%s%s%s] has been superseded",
 141                                                 stype,
 142                                                 aconf->user ? aconf->user : "",
 143                                                 aconf->user ? "@" : "",
 144                                                 aconf->host);
 145                         return 0;
 146                 }
 147                 /* act indicates if something happened (from the oper's
 148                  * point of view). This is the case if the ban was
 149                  * previously active (not deleted) or if the new ban
 150                  * is not a removal and not already expired.
 151                  */
 152                 act = !(aconf->status & CONF_ILLEGAL) || (hold != created &&
 153                                 hold > now);
 154                 if (lifetime > aconf->lifetime)
 155                         aconf->lifetime = lifetime;
 156                 /* already expired, hmm */
 157                 if (aconf->lifetime <= now)
 158                         return 0;
 159                 /* Deactivate, it will be reactivated later if appropriate. */
 160                 deactivate_conf(aconf, ptr, now);
 161                 rb_free(aconf->user);
 162                 aconf->user = NULL;
 163                 rb_free(aconf->host);
 164                 aconf->host = NULL;
 165                 operhash_delete(aconf->info.oper);
 166                 aconf->info.oper = NULL;
 167                 rb_free(aconf->passwd);
 168                 aconf->passwd = NULL;
 169                 rb_free(aconf->spasswd);
 170                 aconf->spasswd = NULL;
 171         }
 172         else
 173         {
 174                 /* New ban mask. */
 175                 aconf = make_conf();
 176                 aconf->status = CONF_ILLEGAL | ntype;
 177                 aconf->lifetime = lifetime;
 178                 rb_dlinkAddAlloc(aconf, &prop_bans);
 179                 act = hold != created && hold > now;
 180         }
 181         aconf->flags &= ~CONF_FLAGS_MYOPER;
 182         aconf->flags |= CONF_FLAGS_TEMPORARY;
 183         aconf->user = ntype == CONF_KILL ? rb_strdup(parv[2]) : NULL;
 184         aconf->host = rb_strdup(parv[3]);
 185         aconf->info.oper = operhash_add(oper);
 186         aconf->created = created;
 187         aconf->hold = hold;
 188         if (ntype != CONF_KILL || (p = strchr(parv[parc - 1], '|')) == NULL)
 189                 aconf->passwd = rb_strdup(parv[parc - 1]);
 190         else
 191         {
 192                 aconf->passwd = rb_strndup(parv[parc - 1], p - parv[parc - 1] + 1);
 193                 aconf->spasswd = rb_strdup(p + 1);
 194         }
 195         /* The ban is fully filled in and in the prop_bans list
 196          * but still deactivated. Now determine if it should be activated
 197          * and send the server notices.
 198          */
 199         /* We only reject *@* and the like here.
 200          * Otherwise malformed bans are fairly harmless and can be removed.
 201          */
 202         switch (ntype)
 203         {
 204                 case CONF_KILL:
 205                         valid = valid_wild_card(aconf->user, aconf->host);
 206                         break;
 207                 case CONF_RESV_CHANNEL:
 208                         valid = 1;
 209                         break;
 210                 default:
 211                         valid = valid_wild_card_simple(aconf->host);
 212                         break;
 213         }
 214         if (act && hold != created && !valid)
 215         {
 216                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 217                                        "Ignoring global %d min. %s from %s%s%s for [%s%s%s]: too few non-wildcard characters",
 218                                        (int)((hold - now) / 60),
 219                                        stype,
 220                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 221                                        strcmp(parv[7], "*") ? " on behalf of " : "",
 222                                        strcmp(parv[7], "*") ? parv[7] : "",
 223                                        aconf->user ? aconf->user : "",
 224                                        aconf->user ? "@" : "",
 225                                        aconf->host);
 226                 if(IsPerson(source_p))
 227                         sendto_one_notice(source_p,
 228                                         ":Your %s [%s%s%s] has too few non-wildcard characters",
 229                                         stype,
 230                                         aconf->user ? aconf->user : "",
 231                                         aconf->user ? "@" : "",
 232                                         aconf->host);
 233                 /* Propagate it, but do not apply it locally. */
 234         }
 235         else if (act && hold != created)
 236         {
 237                 /* Keep the notices in sync with modules/m_kline.c etc. */
 238                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 239                                        "%s added global %d min. %s%s%s for [%s%s%s] [%s]",
 240                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 241                                        (int)((hold - now) / 60),
 242                                        stype,
 243                                        strcmp(parv[7], "*") ? " from " : "",
 244                                        strcmp(parv[7], "*") ? parv[7] : "",
 245                                        aconf->user ? aconf->user : "",
 246                                        aconf->user ? "@" : "",
 247                                        aconf->host,
 248                                        parv[parc - 1]);
 249                 ilog(L_KLINE, "%s %s %d %s%s%s %s", parv[1],
 250                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 251                                 (int)((hold - now) / 60),
 252                                 aconf->user ? aconf->user : "",
 253                                 aconf->user ? " " : "",
 254                                 aconf->host,
 255                                 parv[parc - 1]);
 256                 aconf->status &= ~CONF_ILLEGAL;
 257         }
 258         else if (act)
 259         {
 260                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 261                                 "%s has removed the global %s for: [%s%s%s]%s%s",
 262                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 263                                 stype,
 264                                 aconf->user ? aconf->user : "",
 265                                 aconf->user ? "@" : "",
 266                                 aconf->host,
 267                                 strcmp(parv[7], "*") ? " on behalf of " : "",
 268                                 strcmp(parv[7], "*") ? parv[7] : "");
 269                 ilog(L_KLINE, "U%s %s %s%s %s", parv[1],
 270                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 271                                 aconf->user ? aconf->user : "",
 272                                 aconf->user ? " " : "",
 273                                 aconf->host);
 274         }
 275         /* If CONF_ILLEGAL is still set at this point, remove entries from the
 276          * reject cache (for klines and xlines).
 277          * If CONF_ILLEGAL is not set, add the ban to the type-specific data
 278          * structure and take action on matched clients/channels.
 279          */
 280         switch (ntype)
 281         {
 282                 case CONF_KILL:
 283                         if (aconf->status & CONF_ILLEGAL)
 284                                 remove_reject_mask(aconf->user, aconf->host);
 285                         else
 286                         {
 287                                 add_conf_by_address(aconf->host, CONF_KILL, aconf->user, NULL, aconf);
 288                                 if(ConfigFileEntry.kline_delay ||
 289                                                 (IsServer(source_p) &&
 290                                                  !HasSentEob(source_p)))
 291                                 {
 292                                         if(kline_queued == 0)
 293                                         {
 294                                                 rb_event_addonce("check_klines", check_klines_event, NULL,
 295                                                         ConfigFileEntry.kline_delay ?
 296                                                                 ConfigFileEntry.kline_delay : 1);
 297                                                 kline_queued = 1;
 298                                         }
 299                                 }
 300                                 else
 301                                         check_klines();
 302                         }
 303                         break;
 304                 case CONF_XLINE:
 305                         if (aconf->status & CONF_ILLEGAL)
 306                                 remove_reject_mask(aconf->host, NULL);
 307                         else
 308                         {
 309                                 rb_dlinkAddAlloc(aconf, &xline_conf_list);
 310                                 check_xlines();
 311                         }
 312                         break;
 313                 case CONF_RESV_CHANNEL:
 314                         if (!(aconf->status & CONF_ILLEGAL))
 315                         {
 316                                 add_to_resv_hash(aconf->host, aconf);
 317                                 resv_chan_forcepart(aconf->host, aconf->passwd, hold - now);
 318                         }
 319                         break;
 320                 case CONF_RESV_NICK:
 321                         if (!(aconf->status & CONF_ILLEGAL))
 322                                 rb_dlinkAddAlloc(aconf, &resv_conf_list);
 323                         break;
 324         }
 325         sendto_server(client_p, NULL, CAP_BAN|CAP_TS6, NOCAPS,
 326                         ":%s BAN %s %s %s %s %s %s %s :%s",
 327                         source_p->id,
 328                         parv[1],
 329                         parv[2],
 330                         parv[3],
 331                         parv[4],
 332                         parv[5],
 333                         parv[6],
 334                         parv[7],
 335                         parv[parc - 1]);
 336         return 0;
 337 }