source3/smbd/msg_idmap.c

   1 /*
   2  * Samba Unix/Linux SMB client library
   3  *
   4  * Copyright (C) Gregor Beck 2011
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "smbd/globals.h"
  22 #include "smbd/smbd.h"
  23 #include "../libcli/security/dom_sid.h"
  24 #include "idmap_cache.h"
  25 #include "passdb/lookup_sid.h"
  26 #include "auth.h"
  27 #include "messages.h"
  28 #include "lib/id_cache.h"
  29
  30 static bool uid_in_use(const struct user_struct* user, uid_t uid)
  31 {
  32         while (user) {
  33                 if (user->session_info && (user->session_info->unix_token->uid == uid)) {
  34                         return true;
  35                 }
  36                 user = user->next;
  37         }
  38         return false;
  39 }
  40
  41 static bool gid_in_use(const struct user_struct* user, gid_t gid)
  42 {
  43         while (user) {
  44                 if (user->session_info != NULL) {
  45                         int i;
  46                         struct security_unix_token *utok = user->session_info->unix_token;
  47                         if (utok->gid == gid) {
  48                                 return true;
  49                         }
  50                         for(i=0; i<utok->ngroups; i++) {
  51                                 if (utok->groups[i] == gid) {
  52                                         return true;
  53                                 }
  54                         }
  55                 }
  56                 user = user->next;
  57         }
  58         return false;
  59 }
  60
  61 static bool sid_in_use(const struct user_struct* user, const struct dom_sid* psid)
  62 {
  63         uid_t uid;
  64         gid_t gid;
  65         if (sid_to_gid(psid, &gid)) {
  66                 return gid_in_use(user, gid);
  67         } else if (sid_to_uid(psid, &uid)) {
  68                 return uid_in_use(user, uid);
  69         }
  70         return false;
  71 }
  72
  73 static bool id_in_use(const struct user_struct* user,
  74                       const struct id_cache_ref* id)
  75 {
  76         switch(id->type) {
  77         case UID:
  78                 return uid_in_use(user, id->id.uid);
  79         case GID:
  80                 return gid_in_use(user, id->id.gid);
  81         case SID:
  82                 return sid_in_use(user, &id->id.sid);
  83         default:
  84                 break;
  85         }
  86         return false;
  87 }
  88
  89 static void message_idmap_kill(struct messaging_context *msg_ctx,
  90                                  void *private_data,
  91                                  uint32_t msg_type,
  92                                  struct server_id server_id,
  93                                  DATA_BLOB* data)
  94 {
  95         const char *msg = (data && data->data) ? (const char *)data->data : "<NULL>";
  96         struct user_struct *validated_users = smbd_server_conn->smb1.sessions.validated_users;
  97         struct id_cache_ref id;
  98
  99         if (!id_cache_ref_parse(msg, &id)) {
 100                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
 101                 return;
 102         }
 103
 104         if (id_in_use(validated_users, &id)) {
 105                 exit_server_cleanly(msg);
 106         }
 107 }
 108
 109 void msg_idmap_register_kill_msg(struct messaging_context *ctx)
 110 {
 111         messaging_register(ctx, NULL, MSG_IDMAP_KILL, message_idmap_kill);
 112 }