--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ system call wrapper interface.
+ Copyright (C) Andrew Tridgell 2002
+ Copyright (C) Andrew Barteltt 2002
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ This file may assume linkage with smbd - for things like become_root()
+ etc.
+*/
+
+#include "includes.h"
+
+#ifndef HAVE_GETGROUPLIST
+
+static int int_compare( int *a, int *b )
+{
+ if ( *a == *b )
+ return 0;
+ else if ( *a < *b )
+ return -1;
+ else
+ return 1;
+}
+
+void remove_duplicate_gids( int *num_groups, gid_t *groups )
+{
+ int i;
+ int count = *num_groups;
+
+ if ( *num_groups <= 0 || !groups )
+ return;
+
+ DEBUG(8,("remove_duplicate_gids: Enter %d gids\n", *num_groups));
+
+ qsort( groups, *num_groups, sizeof(gid_t), QSORT_CAST int_compare );
+
+ for ( i=1; i<count; ) {
+ if ( groups[i-1] == groups[i] ) {
+ memmove( &groups[i-1], &groups[i], (count - i + 1)*sizeof(gid_t) );
+
+ /* decrement the total number of groups and do not increment
+ the loop counter */
+ count--;
+ continue;
+ }
+ i++;
+ }
+
+ *num_groups = count;
+
+ DEBUG(8,("remove_duplicate_gids: Exit %d gids\n", *num_groups));
+
+ return;
+}
+
+/*
+ This is a *much* faster way of getting the list of groups for a user
+ without changing the current supplementary group list. The old
+ method used getgrent() which could take 20 minutes on a really big
+ network with hundeds of thousands of groups and users. The new method
+ takes a couple of seconds.
+
+ NOTE!! this function only works if it is called as root!
+ */
+
+static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
+{
+ gid_t *gids_saved;
+ int ret, ngrp_saved, num_gids;
+
+ if (non_root_mode()) {
+ *grpcnt = 0;
+ return 0;
+ }
+
+ /* work out how many groups we need to save */
+ ngrp_saved = getgroups(0, NULL);
+ if (ngrp_saved == -1) {
+ /* this shouldn't happen */
+ return -1;
+ }
+
+ gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
+ if (!gids_saved) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ ngrp_saved = getgroups(ngrp_saved, gids_saved);
+ if (ngrp_saved == -1) {
+ SAFE_FREE(gids_saved);
+ /* very strange! */
+ return -1;
+ }
+
+ if (initgroups(user, gid) != 0) {
+ DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
+ SAFE_FREE(gids_saved);
+ return -1;
+ }
+
+ /* this must be done to cope with systems that put the current egid in the
+ return from getgroups() */
+ save_re_gid();
+ set_effective_gid(gid);
+ setgid(gid);
+
+ num_gids = getgroups(0, NULL);
+ if (num_gids == -1) {
+ SAFE_FREE(gids_saved);
+ /* very strange! */
+ return -1;
+ }
+
+ if (num_gids + 1 > *grpcnt) {
+ *grpcnt = num_gids + 1;
+ ret = -1;
+ } else {
+ ret = getgroups(*grpcnt - 1, &groups[1]);
+ if (ret < 0) {
+ SAFE_FREE(gids_saved);
+ /* very strange! */
+ return -1;
+ }
+ groups[0] = gid;
+ *grpcnt = ret + 1;
+
+ /* remove any duplicates gids in the list */
+ remove_duplicate_gids( grpcnt, groups );
+ }
+
+ restore_re_gid();
+
+ if (sys_setgroups(ngrp_saved, gids_saved) != 0) {
+ /* yikes! */
+ DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
+ smb_panic("getgrouplist: failed to reset group list!\n");
+ free(gids_saved);
+ return -1;
+ }
+
+ free(gids_saved);
+ return ret;
+}
+#endif
+
+static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
+{
+ int retval;
+
+ DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
+
+ /* see if we should disable winbindd lookups for local users */
+ if (strchr(user, *lp_winbind_separator()) == NULL) {
+ if ( !winbind_off() )
+ DEBUG(0,("sys_getgroup_list: Insufficient environment space for %s\n",
+ WINBINDD_DONT_ENV));
+ else
+ DEBUG(10,("sys_getgrouplist(): disabled winbindd for group lookup [user == %s]\n",
+ user));
+ }
+
+#ifdef HAVE_GETGROUPLIST
+ retval = getgrouplist(user, gid, groups, grpcnt);
+#else
+ become_root();
+ retval = getgrouplist_internals(user, gid, groups, grpcnt);
+ unbecome_root();
+#endif
+
+ /* allow winbindd lookups */
+ winbind_on();
+
+ return retval;
+}
+
+static BOOL getgroups_user(const char *user, gid_t primary_gid,
+ gid_t **ret_groups, size_t *p_ngroups)
+{
+ size_t ngrp;
+ int max_grp;
+ gid_t *temp_groups;
+ gid_t *groups;
+ int i;
+
+ max_grp = groups_max();
+ temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
+ if (! temp_groups) {
+ return False;
+ }
+
+ if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
+ gid_t *groups_tmp;
+
+ groups_tmp = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
+
+ if (!groups_tmp) {
+ SAFE_FREE(temp_groups);
+ return False;
+ }
+ temp_groups = groups_tmp;
+
+ if (sys_getgrouplist(user, primary_gid,
+ temp_groups, &max_grp) == -1) {
+ DEBUG(0, ("get_user_groups: failed to get the unix "
+ "group list\n"));
+ SAFE_FREE(temp_groups);
+ return False;
+ }
+ }
+
+ ngrp = 0;
+ groups = NULL;
+
+ /* Add in primary group first */
+ add_gid_to_array_unique(NULL, primary_gid, &groups, &ngrp);
+
+ for (i=0; i<max_grp; i++)
+ add_gid_to_array_unique(NULL, temp_groups[i], &groups, &ngrp);
+
+ *p_ngroups = ngrp;
+ *ret_groups = groups;
+ SAFE_FREE(temp_groups);
+ return True;
+}
+
+NTSTATUS pdb_default_enum_group_memberships(struct pdb_methods *methods,
+ const char *username,
+ gid_t primary_gid,
+ DOM_SID **pp_sids,
+ gid_t **pp_gids,
+ size_t *p_num_groups)
+{
+ size_t i;
+
+ if (!getgroups_user(username, primary_gid, pp_gids, p_num_groups)) {
+ return NT_STATUS_NO_SUCH_USER;
+ }
+
+ if (*p_num_groups == 0) {
+ smb_panic("primary group missing");
+ }
+
+ *pp_sids = SMB_MALLOC_ARRAY(DOM_SID, *p_num_groups);
+
+ if (*pp_sids == NULL) {
+ SAFE_FREE(pp_gids);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ for (i=0; i<*p_num_groups; i++) {
+ if (!NT_STATUS_IS_OK(gid_to_sid(&(*pp_sids)[i], (*pp_gids)[i]))) {
+ DEBUG(1, ("get_user_groups: failed to convert "
+ "gid %ld to a sid!\n",
+ (long int)(*pp_gids)[i+1]));
+ SAFE_FREE(*pp_sids);
+ SAFE_FREE(*pp_gids);
+ return NT_STATUS_NO_SUCH_USER;
+ }
+ }
+
+ return NT_STATUS_OK;
+}
projects / samba / blobdiff