source/smbd/groupname.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Groupname handling
   5    Copyright (C) Jeremy Allison 1998.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #ifdef USING_GROUPNAME_MAP
  23
  24 #include "includes.h"
  25 extern DOM_SID global_sam_sid;
  26
  27
  28 /**************************************************************************
  29  Groupname map functionality. The code loads a groupname map file and
  30  (currently) loads it into a linked list. This is slow and memory
  31  hungry, but can be changed into a more efficient storage format
  32  if the demands on it become excessive.
  33 ***************************************************************************/
  34
  35 typedef struct groupname_map {
  36    ubi_slNode next;
  37
  38    char *windows_name;
  39    DOM_SID windows_sid;
  40    char *unix_name;
  41    gid_t unix_gid;
  42 } groupname_map_entry;
  43
  44 static ubi_slList groupname_map_list;
  45
  46 /**************************************************************************
  47  Delete all the entries in the groupname map list.
  48 ***************************************************************************/
  49
  50 static void delete_groupname_map_list(void)
  51 {
  52   groupname_map_entry *gmep;
  53
  54   while((gmep = (groupname_map_entry *)ubi_slRemHead( &groupname_map_list )) != NULL) {
  55     SAFE_FREE(gmep->windows_name);
  56     SAFE_FREE(gmep->unix_name);
  57     SAFE_FREE(gmep);
  58   }
  59 }
  60
  61 /**************************************************************************
  62  Load a groupname map file. Sets last accessed timestamp.
  63 ***************************************************************************/
  64
  65 void load_groupname_map(void)
  66 {
  67   static time_t groupmap_file_last_modified = (time_t)0;
  68   static BOOL initialized = False;
  69   char *groupname_map_file = lp_groupname_map();
  70   SMB_STRUCT_STAT st;
  71   char **lines;
  72   int i;
  73   groupname_map_entry *new_ep;
  74
  75   if(!initialized) {
  76     ubi_slInitList( &groupname_map_list );
  77     initialized = True;
  78   }
  79
  80   if (!*groupname_map_file)
  81     return;
  82
  83   if(sys_stat(groupname_map_file, &st) != 0) {
  84     DEBUG(0, ("load_groupname_map: Unable to stat file %s. Error was %s\n",
  85                groupname_map_file, strerror(errno) ));
  86     return;
  87   }
  88
  89   /*
  90    * Check if file has changed.
  91    */
  92   if( st.st_mtime <= groupmap_file_last_modified)
  93     return;
  94
  95   groupmap_file_last_modified = st.st_mtime;
  96
  97   /*
  98    * Load the file.
  99    */
 100
 101   lines = file_lines_load(groupname_map_file,NULL,False);
 102   if (!lines) {
 103     DEBUG(0,("load_groupname_map: can't open groupname map %s. Error was %s\n",
 104           groupname_map_file, strerror(errno)));
 105     return;
 106   }
 107   file_lines_slashcont(lines);
 108
 109   /*
 110    * Throw away any previous list.
 111    */
 112   delete_groupname_map_list();
 113
 114   DEBUG(4,("load_groupname_map: Scanning groupname map %s\n",groupname_map_file));
 115
 116   for (i=0; lines[i]; i++) {
 117     pstring unixname;
 118     pstring windows_name;
 119     gid_t gid;
 120     DOM_SID tmp_sid;
 121     char *s = lines[i];
 122
 123     DEBUG(10,("load_groupname_map: Read line |%s|\n", s));
 124
 125     if (!*s || strchr("#;",*s))
 126       continue;
 127
 128     if(!next_token(&s,unixname, "\t\n\r=", sizeof(unixname)))
 129       continue;
 130
 131     if(!next_token(&s,windows_name, "\t\n\r=", sizeof(windows_name)))
 132       continue;
 133
 134     trim_string(unixname, " ", " ");
 135     trim_string(windows_name, " ", " ");
 136
 137     if (!*windows_name)
 138       continue;
 139
 140     if(!*unixname)
 141       continue;
 142
 143     DEBUG(5,("load_groupname_map: unixname = %s, windowsname = %s.\n",
 144              unixname, windows_name));
 145
 146     /*
 147      * Attempt to get the unix gid_t for this name.
 148      */
 149
 150         if ((gid = nametogid(unixname)) == (gid_t)-1)
 151       DEBUG(0,("load_groupname_map: nametogid for group %s failed.\
 152 Error was %s.\n", unixname, strerror(errno) ));
 153       continue;
 154     }
 155
 156     /*
 157      * Now map to an NT SID.
 158      */
 159
 160     if(!lookup_wellknown_sid_from_name(windows_name, &tmp_sid)) {
 161       /*
 162        * It's not a well known name, convert the UNIX gid_t
 163        * to a rid within this domain SID.
 164        */
 165       tmp_sid = global_sam_sid;
 166       tmp_sid.sub_auths[tmp_sid.num_auths++] =
 167                     pdb_gid_to_group_rid(gid);
 168     }
 169
 170     /*
 171      * Create the list entry and add it onto the list.
 172      */
 173
 174     if((new_ep = (groupname_map_entry *)malloc( sizeof(groupname_map_entry) ))== NULL) {
 175       DEBUG(0,("load_groupname_map: malloc fail for groupname_map_entry.\n"));
 176       fclose(fp);
 177       return;
 178     }
 179
 180     new_ep->unix_gid = gid;
 181     new_ep->windows_sid = tmp_sid;
 182     new_ep->windows_name = strdup( windows_name );
 183     new_ep->unix_name = strdup( unixname );
 184
 185     if(new_ep->windows_name == NULL || new_ep->unix_name == NULL) {
 186       DEBUG(0,("load_groupname_map: malloc fail for names in groupname_map_entry.\n"));
 187       fclose(fp);
 188       SAFE_FREE(new_ep->windows_name);
 189       SAFE_FREE(new_ep->unix_name);
 190       SAFE_FREE(new_ep);
 191       file_lines_free(lines);
 192       return;
 193     }
 194     memset((char *)&new_ep->next, '\0', sizeof(new_ep->next) );
 195
 196     ubi_slAddHead( &groupname_map_list, (ubi_slNode *)new_ep);
 197   }
 198
 199   DEBUG(10,("load_groupname_map: Added %ld entries to groupname map.\n",
 200             ubi_slCount(&groupname_map_list)));
 201
 202   file_lines_free(lines);
 203 }
 204
 205 /***********************************************************
 206  Lookup a SID entry by gid_t.
 207 ************************************************************/
 208
 209 void map_gid_to_sid( gid_t gid, DOM_SID *psid)
 210 {
 211   groupname_map_entry *gmep;
 212
 213   /*
 214    * Initialize and load if not already loaded.
 215    */
 216   load_groupname_map();
 217
 218   for( gmep = (groupname_map_entry *)ubi_slFirst( &groupname_map_list);
 219        gmep; gmep = (groupname_map_entry *)ubi_slNext( gmep )) {
 220
 221     if( gmep->unix_gid == gid) {
 222       *psid = gmep->windows_sid;
 223       DEBUG(7,("map_gid_to_sid: Mapping unix group %s to windows group %s.\n",
 224                gmep->unix_name, gmep->windows_name ));
 225       return;
 226     }
 227   }
 228
 229   /*
 230    * If there's no map, convert the UNIX gid_t
 231    * to a rid within this domain SID.
 232    */
 233   *psid = global_sam_sid;
 234   psid->sub_auths[psid->num_auths++] = pdb_gid_to_group_rid(gid);
 235
 236   return;
 237 }
 238 #else /* USING_GROUPNAME_MAP */
 239  void load_groupname_map(void) {;}
 240 #endif /* USING_GROUPNAME_MAP */