summaryrefslogtreecommitdiffstats
path: root/source3/lib/system_smbd.c
diff options
context:
space:
mode:
Diffstat (limited to 'source3/lib/system_smbd.c')
-rw-r--r--source3/lib/system_smbd.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/source3/lib/system_smbd.c b/source3/lib/system_smbd.c
new file mode 100644
index 0000000..73bffe0
--- /dev/null
+++ b/source3/lib/system_smbd.c
@@ -0,0 +1,253 @@
+/*
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+ This file may assume linkage with smbd - for things like become_root()
+ etc.
+*/
+
+#include "includes.h"
+#include "system/passwd.h"
+#include "nsswitch/winbind_client.h"
+#include "../lib/util/setid.h"
+
+#ifndef HAVE_GETGROUPLIST
+
+#ifdef HAVE_GETGRSET
+static int getgrouplist_getgrset(const char *user, gid_t gid, gid_t *groups,
+ int *grpcnt)
+{
+ char *grplist;
+ char *grp;
+ gid_t temp_gid;
+ int num_gids = 1;
+ int ret = 0;
+ long l;
+
+ grplist = getgrset(user);
+
+ DEBUG(10, ("getgrset returned %s\n", grplist));
+
+ if (grplist == NULL) {
+ return -1;
+ }
+
+ if (*grpcnt > 0) {
+ groups[0] = gid;
+ }
+
+ while ((grp = strsep(&grplist, ",")) != NULL) {
+ l = strtol(grp, NULL, 10);
+ temp_gid = (gid_t) l;
+ if (temp_gid == gid) {
+ continue;
+ }
+
+ if (num_gids + 1 > *grpcnt) {
+ num_gids++;
+ continue;
+ }
+ groups[num_gids++] = temp_gid;
+ }
+ free(grplist);
+
+ if (num_gids > *grpcnt) {
+ ret = -1;
+ }
+ *grpcnt = num_gids;
+
+ DEBUG(10, ("Found %d groups for user %s\n", *grpcnt, user));
+
+ return ret;
+}
+
+#else /* HAVE_GETGRSET */
+
+/*
+ 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) == -1) {
+ 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);
+ samba_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;
+ }
+
+ restore_re_gid();
+
+ if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
+ /* yikes! */
+ DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
+ smb_panic("getgrouplist: failed to reset group list!");
+ }
+
+ free(gids_saved);
+ return ret;
+}
+#endif /* HAVE_GETGRSET */
+#endif /* HAVE_GETGROUPLIST */
+
+static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
+{
+ int retval;
+ bool winbind_env;
+
+ DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
+
+ /* This is only ever called for Unix users, remote memberships are
+ * always determined by the info3 coming back from auth3 or the
+ * PAC. */
+ winbind_env = winbind_env_set();
+ (void)winbind_off();
+
+#ifdef HAVE_GETGROUPLIST
+ retval = getgrouplist(user, gid, groups, grpcnt);
+#else
+#ifdef HAVE_GETGRSET
+ retval = getgrouplist_getgrset(user, gid, groups, grpcnt);
+#else
+ become_root();
+ retval = getgrouplist_internals(user, gid, groups, grpcnt);
+ unbecome_root();
+#endif /* HAVE_GETGRSET */
+#endif /* HAVE_GETGROUPLIST */
+
+ /* allow winbindd lookups, but only if they were not already disabled */
+ if (!winbind_env) {
+ (void)winbind_on();
+ }
+
+ return retval;
+}
+
+bool getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
+ gid_t primary_gid,
+ gid_t **ret_groups, uint32_t *p_ngroups)
+{
+ int max_grp = MIN(128, getgroups_max());
+ gid_t stack_groups[max_grp];
+ uint32_t ngrp;
+ gid_t *temp_groups = stack_groups;
+ gid_t *to_free = NULL;
+ gid_t *groups;
+ int i;
+
+ if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
+ to_free = talloc_array(mem_ctx, gid_t, max_grp);
+ if (!to_free) {
+ return False;
+ }
+ temp_groups = to_free;
+
+ if (sys_getgrouplist(user, primary_gid,
+ temp_groups, &max_grp) == -1) {
+ DEBUG(0, ("get_user_groups: failed to get the unix "
+ "group list\n"));
+ TALLOC_FREE(to_free);
+ return False;
+ }
+ }
+
+ ngrp = 0;
+ groups = NULL;
+
+ /* Add in primary group first */
+ if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
+ TALLOC_FREE(to_free);
+ return False;
+ }
+
+ for (i=0; i<max_grp; i++) {
+ if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
+ &groups, &ngrp)) {
+ TALLOC_FREE(to_free);
+ return False;
+ }
+ }
+
+ *p_ngroups = ngrp;
+ *ret_groups = groups;
+ TALLOC_FREE(to_free);
+ return True;
+}