Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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..4a14744
--- /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;
+}