source/lib/util_smbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions, used in smbd only
   4    Copyright (C) Andrew Tridgell 2002
   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 #include "includes.h"
  22
  23 /*
  24    This function requires sys_getgrouplist - which is only
  25    available in smbd due to it's use of become_root() in a
  26    legacy systems hack.
  27 */
  28
  29 /*
  30   return a full list of groups for a user
  31
  32   returns the number of groups the user is a member of. The return will include the
  33   users primary group.
  34
  35   remember to free the resulting gid_t array
  36
  37   NOTE! uses become_root() to gain correct priviages on systems
  38   that lack a native getgroups() call (uses initgroups and getgroups)
  39 */
  40 BOOL getgroups_user(const char *user, gid_t primary_gid, gid_t **ret_groups, int *ngroups)
  41 {
  42         int ngrp, max_grp;
  43         gid_t *temp_groups;
  44         gid_t *groups;
  45         int i;
  46
  47         max_grp = groups_max();
  48         temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
  49         if (! temp_groups) {
  50                 return False;
  51         }
  52
  53         if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
  54
  55                 gid_t *groups_tmp;
  56
  57                 groups_tmp = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
  58
  59                 if (!groups_tmp) {
  60                         SAFE_FREE(temp_groups);
  61                         return False;
  62                 }
  63                 temp_groups = groups_tmp;
  64
  65                 if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
  66                         DEBUG(0, ("get_user_groups: failed to get the unix group list\n"));
  67                         SAFE_FREE(temp_groups);
  68                         return False;
  69                 }
  70         }
  71
  72         ngrp = 0;
  73         groups = NULL;
  74
  75         /* Add in primary group first */
  76         add_gid_to_array_unique(NULL, primary_gid, &groups, &ngrp);
  77
  78         for (i=0; i<max_grp; i++)
  79                 add_gid_to_array_unique(NULL, temp_groups[i], &groups, &ngrp);
  80
  81         *ngroups = ngrp;
  82         *ret_groups = groups;
  83         SAFE_FREE(temp_groups);
  84         return True;
  85 }
  86