modules/core/m_ban.c

   1 /*
   2  * Solanum: a slightly 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 "defaults.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 #include "logger.h"
  47
  48 static const char ban_desc[] = "Provides the TS6 BAN command for propagating network-wide bans";
  49
  50 static void m_ban(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  51 static void ms_ban(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
  52
  53 struct Message ban_msgtab = {
  54         "BAN", 0, 0, 0, 0,
  55         {mg_unreg, {m_ban, 0}, {ms_ban, 9}, {ms_ban, 9}, mg_ignore, {m_ban, 0}}
  56 };
  57
  58 mapi_clist_av1 ban_clist[] =  { &ban_msgtab, NULL };
  59
  60 DECLARE_MODULE_AV2(ban, NULL, NULL, ban_clist, NULL, NULL, NULL, NULL, ban_desc);
  61
  62 static void
  63 m_ban(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  64 {
  65         sendto_one_notice(source_p, ":The BAN command is not user-accessible.");
  66         sendto_one_notice(source_p, ":To ban a user from a channel, see /QUOTE HELP CMODE");
  67         if (IsOperGeneral(source_p))
  68                 sendto_one_notice(source_p, ":To ban a user from a server or from the network, see /QUOTE HELP KLINE");
  69 }
  70
  71 /* ms_ban()
  72  *
  73  * parv[1] - type
  74  * parv[2] - username mask or *
  75  * parv[3] - hostname mask
  76  * parv[4] - creation TS
  77  * parv[5] - duration (relative to creation)
  78  * parv[6] - lifetime (relative to creation)
  79  * parv[7] - oper or *
  80  * parv[8] - reason (possibly with |operreason)
  81  */
  82 static void
  83 ms_ban(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  84 {
  85         rb_dlink_node *ptr;
  86         struct ConfItem *aconf;
  87         unsigned int ntype;
  88         const char *oper, *stype;
  89         time_t now, created, hold, lifetime;
  90         char *p;
  91         int act;
  92         int valid;
  93
  94         now = rb_current_time();
  95         if (strlen(parv[1]) != 1)
  96         {
  97                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  98                                 "Unknown BAN type %s from %s",
  99                                 parv[1], source_p->name);
 100                 return;
 101         }
 102         switch (parv[1][0])
 103         {
 104                 case 'K':
 105                         ntype = CONF_KILL;
 106                         stype = "K-Line";
 107                         break;
 108                 case 'X':
 109                         ntype = CONF_XLINE;
 110                         stype = "X-Line";
 111                         break;
 112                 case 'R':
 113                         ntype = IsChannelName(parv[3]) ? CONF_RESV_CHANNEL :
 114                                 CONF_RESV_NICK;
 115                         stype = "RESV";
 116                         break;
 117                 default:
 118                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 119                                         "Unknown BAN type %s from %s",
 120                                         parv[1], source_p->name);
 121                         return;
 122         }
 123         created = atol(parv[4]);
 124         hold = created + atoi(parv[5]);
 125         lifetime = created + atoi(parv[6]);
 126         if (!strcmp(parv[7], "*"))
 127                 oper = IsServer(source_p) ? source_p->name : get_oper_name(source_p);
 128         else
 129                 oper = parv[7];
 130         ptr = find_prop_ban(ntype, parv[2], parv[3]);
 131         if (ptr != NULL)
 132         {
 133                 /* We already know about this ban mask. */
 134                 aconf = ptr->data;
 135                 if (aconf->created > created ||
 136                                 (aconf->created == created &&
 137                                  aconf->lifetime >= lifetime))
 138                 {
 139                         if (IsPerson(source_p))
 140                                 sendto_one_notice(source_p,
 141                                                 ":Your %s [%s%s%s] has been superseded",
 142                                                 stype,
 143                                                 aconf->user ? aconf->user : "",
 144                                                 aconf->user ? "@" : "",
 145                                                 aconf->host);
 146                         return;
 147                 }
 148                 /* act indicates if something happened (from the oper's
 149                  * point of view). This is the case if the ban was
 150                  * previously active (not deleted) or if the new ban
 151                  * is not a removal and not already expired.
 152                  */
 153                 act = !(aconf->status & CONF_ILLEGAL) || (hold != created &&
 154                                 hold > now);
 155                 if (lifetime > aconf->lifetime)
 156                         aconf->lifetime = lifetime;
 157                 /* already expired, hmm */
 158                 if (aconf->lifetime <= now)
 159                         return;
 160                 /* Deactivate, it will be reactivated later if appropriate. */
 161                 deactivate_conf(aconf, ptr, now);
 162                 rb_free(aconf->user);
 163                 aconf->user = NULL;
 164                 rb_free(aconf->host);
 165                 aconf->host = NULL;
 166                 operhash_delete(aconf->info.oper);
 167                 aconf->info.oper = NULL;
 168                 rb_free(aconf->passwd);
 169                 aconf->passwd = NULL;
 170                 rb_free(aconf->spasswd);
 171                 aconf->spasswd = NULL;
 172         }
 173         else
 174         {
 175                 /* New ban mask. */
 176                 aconf = make_conf();
 177                 aconf->status = CONF_ILLEGAL | ntype;
 178                 aconf->lifetime = lifetime;
 179                 rb_dlinkAddAlloc(aconf, &prop_bans);
 180                 act = hold != created && hold > now;
 181         }
 182         aconf->flags &= ~CONF_FLAGS_MYOPER;
 183         aconf->flags |= CONF_FLAGS_TEMPORARY;
 184         aconf->user = ntype == CONF_KILL ? rb_strdup(parv[2]) : NULL;
 185         aconf->host = rb_strdup(parv[3]);
 186         aconf->info.oper = operhash_add(oper);
 187         aconf->created = created;
 188         aconf->hold = hold;
 189         if (ntype != CONF_KILL || (p = strchr(parv[parc - 1], '|')) == NULL)
 190                 aconf->passwd = rb_strdup(parv[parc - 1]);
 191         else
 192         {
 193                 aconf->passwd = rb_strndup(parv[parc - 1], p - parv[parc - 1] + 1);
 194                 aconf->spasswd = rb_strdup(p + 1);
 195         }
 196         /* The ban is fully filled in and in the prop_bans list
 197          * but still deactivated. Now determine if it should be activated
 198          * and send the server notices.
 199          */
 200         /* We only reject *@* and the like here.
 201          * Otherwise malformed bans are fairly harmless and can be removed.
 202          */
 203         switch (ntype)
 204         {
 205                 case CONF_KILL:
 206                         valid = valid_wild_card(aconf->user, aconf->host);
 207                         break;
 208                 case CONF_RESV_CHANNEL:
 209                         valid = 1;
 210                         break;
 211                 default:
 212                         valid = valid_wild_card_simple(aconf->host);
 213                         break;
 214         }
 215         if (act && hold != created && !valid)
 216         {
 217                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 218                                        "Ignoring global %d min. %s from %s%s%s for [%s%s%s]: too few non-wildcard characters",
 219                                        (int)((hold - now) / 60),
 220                                        stype,
 221                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 222                                        strcmp(parv[7], "*") ? " on behalf of " : "",
 223                                        strcmp(parv[7], "*") ? parv[7] : "",
 224                                        aconf->user ? aconf->user : "",
 225                                        aconf->user ? "@" : "",
 226                                        aconf->host);
 227                 if(IsPerson(source_p))
 228                         sendto_one_notice(source_p,
 229                                         ":Your %s [%s%s%s] has too few non-wildcard characters",
 230                                         stype,
 231                                         aconf->user ? aconf->user : "",
 232                                         aconf->user ? "@" : "",
 233                                         aconf->host);
 234                 /* Propagate it, but do not apply it locally. */
 235         }
 236         else if (act && hold != created)
 237         {
 238                 /* Keep the notices in sync with modules/m_kline.c etc. */
 239                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 240                                        "%s added global %d min. %s%s%s for [%s%s%s] [%s]",
 241                                        IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 242                                        (int)((hold - now) / 60),
 243                                        stype,
 244                                        strcmp(parv[7], "*") ? " from " : "",
 245                                        strcmp(parv[7], "*") ? parv[7] : "",
 246                                        aconf->user ? aconf->user : "",
 247                                        aconf->user ? "@" : "",
 248                                        aconf->host,
 249                                        parv[parc - 1]);
 250                 ilog(L_KLINE, "%s %s %d %s%s%s %s", parv[1],
 251                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 252                                 (int)((hold - now) / 60),
 253                                 aconf->user ? aconf->user : "",
 254                                 aconf->user ? " " : "",
 255                                 aconf->host,
 256                                 parv[parc - 1]);
 257                 aconf->status &= ~CONF_ILLEGAL;
 258         }
 259         else if (act)
 260         {
 261                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 262                                 "%s has removed the global %s for: [%s%s%s]%s%s",
 263                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 264                                 stype,
 265                                 aconf->user ? aconf->user : "",
 266                                 aconf->user ? "@" : "",
 267                                 aconf->host,
 268                                 strcmp(parv[7], "*") ? " on behalf of " : "",
 269                                 strcmp(parv[7], "*") ? parv[7] : "");
 270                 ilog(L_KLINE, "U%s %s %s%s %s", parv[1],
 271                                 IsServer(source_p) ? source_p->name : get_oper_name(source_p),
 272                                 aconf->user ? aconf->user : "",
 273                                 aconf->user ? " " : "",
 274                                 aconf->host);
 275         }
 276         /* If CONF_ILLEGAL is still set at this point, remove entries from the
 277          * reject cache (for klines and xlines).
 278          * If CONF_ILLEGAL is not set, add the ban to the type-specific data
 279          * structure and take action on matched clients/channels.
 280          */
 281         switch (ntype)
 282         {
 283                 case CONF_KILL:
 284                         if (aconf->status & CONF_ILLEGAL)
 285                                 remove_reject_mask(aconf->user, aconf->host);
 286                         else
 287                         {
 288                                 add_conf_by_address(aconf->host, CONF_KILL, aconf->user, NULL, aconf);
 289                                 check_one_kline(aconf);
 290                         }
 291                         break;
 292                 case CONF_XLINE:
 293                         if (aconf->status & CONF_ILLEGAL)
 294                                 remove_reject_mask(aconf->host, NULL);
 295                         else
 296                         {
 297                                 rb_dlinkAddAlloc(aconf, &xline_conf_list);
 298                                 check_xlines();
 299                         }
 300                         break;
 301                 case CONF_RESV_CHANNEL:
 302                         if (!(aconf->status & CONF_ILLEGAL))
 303                         {
 304                                 add_to_resv_hash(aconf->host, aconf);
 305                                 resv_chan_forcepart(aconf->host, aconf->passwd, hold - now);
 306                         }
 307                         break;
 308                 case CONF_RESV_NICK:
 309                         if (!(aconf->status & CONF_ILLEGAL))
 310                                 rb_dlinkAddAlloc(aconf, &resv_conf_list);
 311                         break;
 312         }
 313         sendto_server(client_p, NULL, CAP_BAN|CAP_TS6, NOCAPS,
 314                         ":%s BAN %s %s %s %s %s %s %s :%s",
 315                         source_p->id,
 316                         parv[1],
 317                         parv[2],
 318                         parv[3],
 319                         parv[4],
 320                         parv[5],
 321                         parv[6],
 322                         parv[7],
 323                         parv[parc - 1]);
 324 }