source3/smbd/groupname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Groupname handling
   4    Copyright (C) Jeremy Allison 1998.
   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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #ifdef USING_GROUPNAME_MAP
  22
  23 #include "includes.h"
  24
  25 /**************************************************************************
  26  Groupname map functionality. The code loads a groupname map file and
  27  (currently) loads it into a linked list. This is slow and memory
  28  hungry, but can be changed into a more efficient storage format
  29  if the demands on it become excessive.
  30 ***************************************************************************/
  31
  32 typedef struct groupname_map {
  33    ubi_slNode next;
  34
  35    char *windows_name;
  36    DOM_SID windows_sid;
  37    char *unix_name;
  38    gid_t unix_gid;
  39 } groupname_map_entry;
  40
  41 static ubi_slList groupname_map_list;
  42
  43 /**************************************************************************
  44  Delete all the entries in the groupname map list.
  45 ***************************************************************************/
  46
  47 static void delete_groupname_map_list(void)
  48 {
  49   groupname_map_entry *gmep;
  50
  51   while((gmep = (groupname_map_entry *)ubi_slRemHead( &groupname_map_list )) != NULL) {
  52     SAFE_FREE(gmep->windows_name);
  53     SAFE_FREE(gmep->unix_name);
  54     SAFE_FREE(gmep);
  55   }
  56 }
  57
  58 /**************************************************************************
  59  Load a groupname map file. Sets last accessed timestamp.
  60 ***************************************************************************/
  61
  62 void load_groupname_map(void)
  63 {
  64   static time_t groupmap_file_last_modified = (time_t)0;
  65   static BOOL initialized = False;
  66   char *groupname_map_file = lp_groupname_map();
  67   SMB_STRUCT_STAT st;
  68   char **lines;
  69   int i;
  70   groupname_map_entry *new_ep;
  71
  72   if(!initialized) {
  73     ubi_slInitList( &groupname_map_list );
  74     initialized = True;
  75   }
  76
  77   if (!*groupname_map_file)
  78     return;
  79
  80   if(sys_stat(groupname_map_file, &st) != 0) {
  81     DEBUG(0, ("load_groupname_map: Unable to stat file %s. Error was %s\n",
  82                groupname_map_file, strerror(errno) ));
  83     return;
  84   }
  85
  86   /*
  87    * Check if file has changed.
  88    */
  89   if( st.st_mtime <= groupmap_file_last_modified)
  90     return;
  91
  92   groupmap_file_last_modified = st.st_mtime;
  93
  94   /*
  95    * Load the file.
  96    */
  97
  98   lines = file_lines_load(groupname_map_file,NULL,False);
  99   if (!lines) {
 100     DEBUG(0,("load_groupname_map: can't open groupname map %s. Error was %s\n",
 101           groupname_map_file, strerror(errno)));
 102     return;
 103   }
 104   file_lines_slashcont(lines);
 105
 106   /*
 107    * Throw away any previous list.
 108    */
 109   delete_groupname_map_list();
 110
 111   DEBUG(4,("load_groupname_map: Scanning groupname map %s\n",groupname_map_file));
 112
 113   for (i=0; lines[i]; i++) {
 114     pstring unixname;
 115     pstring windows_name;
 116     gid_t gid;
 117     DOM_SID tmp_sid;
 118     char *s = lines[i];
 119
 120     DEBUG(10,("load_groupname_map: Read line |%s|\n", s));
 121
 122     if (!*s || strchr_m("#;",*s))
 123       continue;
 124
 125     if(!next_token(&s,unixname, "\t\n\r=", sizeof(unixname)))
 126       continue;
 127
 128     if(!next_token(&s,windows_name, "\t\n\r=", sizeof(windows_name)))
 129       continue;
 130
 131     trim_string(unixname, " ", " ");
 132     trim_string(windows_name, " ", " ");
 133
 134     if (!*windows_name)
 135       continue;
 136
 137     if(!*unixname)
 138       continue;
 139
 140     DEBUG(5,("load_groupname_map: unixname = %s, windowsname = %s.\n",
 141              unixname, windows_name));
 142
 143     /*
 144      * Attempt to get the unix gid_t for this name.
 145      */
 146
 147         if ((gid = nametogid(unixname)) == (gid_t)-1)
 148       DEBUG(0,("load_groupname_map: nametogid for group %s failed.\
 149 Error was %s.\n", unixname, strerror(errno) ));
 150       continue;
 151     }
 152
 153     /*
 154      * Now map to an NT SID.
 155      */
 156
 157     if(!lookup_wellknown_sid_from_name(windows_name, &tmp_sid)) {
 158       /*
 159        * It's not a well known name, convert the UNIX gid_t
 160        * to a rid within this domain SID.
 161        */
 162       sid_copy(&tmp_sid,get_global_sam_sid());
 163       tmp_sid.sub_auths[tmp_sid.num_auths++] =
 164                     pdb_gid_to_group_rid(gid);
 165     }
 166
 167     /*
 168      * Create the list entry and add it onto the list.
 169      */
 170
 171     if((new_ep = (groupname_map_entry *)malloc( sizeof(groupname_map_entry) ))== NULL) {
 172       DEBUG(0,("load_groupname_map: malloc fail for groupname_map_entry.\n"));
 173       fclose(fp);
 174       return;
 175     }
 176
 177     new_ep->unix_gid = gid;
 178     new_ep->windows_sid = tmp_sid;
 179     new_ep->windows_name = strdup( windows_name );
 180     new_ep->unix_name = strdup( unixname );
 181
 182     if(new_ep->windows_name == NULL || new_ep->unix_name == NULL) {
 183       DEBUG(0,("load_groupname_map: malloc fail for names in groupname_map_entry.\n"));
 184       fclose(fp);
 185       SAFE_FREE(new_ep->windows_name);
 186       SAFE_FREE(new_ep->unix_name);
 187       SAFE_FREE(new_ep);
 188       file_lines_free(lines);
 189       return;
 190     }
 191     memset((char *)&new_ep->next, '\0', sizeof(new_ep->next) );
 192
 193     ubi_slAddHead( &groupname_map_list, (ubi_slNode *)new_ep);
 194   }
 195
 196   DEBUG(10,("load_groupname_map: Added %ld entries to groupname map.\n",
 197             ubi_slCount(&groupname_map_list)));
 198
 199   file_lines_free(lines);
 200 }
 201
 202 /***********************************************************
 203  Lookup a SID entry by gid_t.
 204 ************************************************************/
 205
 206 void map_gid_to_sid( gid_t gid, DOM_SID *psid)
 207 {
 208   groupname_map_entry *gmep;
 209
 210   /*
 211    * Initialize and load if not already loaded.
 212    */
 213   load_groupname_map();
 214
 215   for( gmep = (groupname_map_entry *)ubi_slFirst( &groupname_map_list);
 216        gmep; gmep = (groupname_map_entry *)ubi_slNext( gmep )) {
 217
 218     if( gmep->unix_gid == gid) {
 219       *psid = gmep->windows_sid;
 220       DEBUG(7,("map_gid_to_sid: Mapping unix group %s to windows group %s.\n",
 221                gmep->unix_name, gmep->windows_name ));
 222       return;
 223     }
 224   }
 225
 226   /*
 227    * If there's no map, convert the UNIX gid_t
 228    * to a rid within this domain SID.
 229    */
 230   sid_copy(psid,get_global_sam_sid());
 231   psid->sub_auths[psid->num_auths++] = pdb_gid_to_group_rid(gid);
 232
 233   return;
 234 }
 235 #else /* USING_GROUPNAME_MAP */
 236  void load_groupname_map(void) {;}
 237 #endif /* USING_GROUPNAME_MAP */