source3/lib/id_cache.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 /**
  21  * @brief  Notify smbd about idmap changes
  22  * @file   msg_idmap.c
  23  * @author Gregor Beck <gb@sernet.de>
  24  * @date   Feb 2011
  25  *
  26  */
  27
  28 #include "includes.h"
  29 #include "messages.h"
  30 #include "lib/id_cache.h"
  31 #include "../lib/util/memcache.h"
  32 #include "idmap_cache.h"
  33 #include "../librpc/gen_ndr/ndr_security.h"
  34 #include "../libcli/security/dom_sid.h"
  35
  36 bool id_cache_ref_parse(const char* str, struct id_cache_ref* id)
  37 {
  38         struct dom_sid sid;
  39         unsigned long ul;
  40         char c, trash;
  41
  42         if (sscanf(str, "%cID %lu%c", &c, &ul, &trash) == 2) {
  43                 switch(c) {
  44                 case 'G':
  45                         id->id.gid = ul;
  46                         id->type = GID;
  47                         return true;
  48                 case 'U':
  49                         id->id.uid = ul;
  50                         id->type = UID;
  51                         return true;
  52                 default:
  53                         break;
  54                 }
  55         } else if (string_to_sid(&sid, str)) {
  56                 id->id.sid = sid;
  57                 id->type = SID;
  58                 return true;
  59         } else if (strncmp(str, "USER ", 5) == 0) {
  60                 id->id.name = str + 5;
  61                 id->type = USERNAME;
  62                 return true;
  63         }
  64         return false;
  65 }
  66
  67 static bool delete_getpwnam_cache(const char *username)
  68 {
  69         DATA_BLOB name = data_blob_string_const_null(username);
  70         DEBUG(6, ("Delete passwd struct for %s from memcache\n",
  71                   username));
  72         memcache_delete(NULL, GETPWNAM_CACHE, name);
  73         return true;
  74 }
  75
  76 void id_cache_delete_from_cache(const struct id_cache_ref* id)
  77 {
  78         switch(id->type) {
  79         case UID:
  80                 idmap_cache_del_uid(id->id.uid);
  81                 break;
  82         case GID:
  83                 idmap_cache_del_gid(id->id.gid);
  84                 break;
  85         case SID:
  86                 idmap_cache_del_sid(&id->id.sid);
  87                 break;
  88         case USERNAME:
  89                 delete_getpwnam_cache(id->id.name);
  90                 break;
  91         default:
  92                 break;
  93         }
  94 }
  95
  96 void id_cache_delete_message(struct messaging_context *msg_ctx,
  97                              void *private_data,
  98                              uint32_t msg_type,
  99                              struct server_id server_id,
 100                              DATA_BLOB* data)
 101 {
 102         const char *msg = (data && data->data) ? (const char *)data->data : "<NULL>";
 103         struct id_cache_ref id;
 104
 105         if (!id_cache_ref_parse(msg, &id)) {
 106                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
 107                 return;
 108         }
 109
 110         id_cache_delete_from_cache(&id);
 111 }
 112
 113 void id_cache_register_msgs(struct messaging_context *ctx)
 114 {
 115         messaging_register(ctx, NULL, ID_CACHE_DELETE, id_cache_delete_message);
 116 }