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-rw-r--r--source3/lib/util_sec.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/source3/lib/util_sec.c b/source3/lib/util_sec.c
new file mode 100644
index 0000000000..4a2ac2565e
--- /dev/null
+++ b/source3/lib/util_sec.c
@@ -0,0 +1,326 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 2.0
+ Copyright (C) Jeremy Allison 1998.
+ rewritten for version 2.0.6 by Tridge
+
+ 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.
+*/
+
+#ifndef AUTOCONF_TEST
+#include "includes.h"
+extern int DEBUGLEVEL;
+#else
+/* we are running this code in autoconf test mode to see which type of setuid
+ function works */
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef HAVE_SYS_PRIV_H
+#include <sys/priv.h>
+#endif
+#ifdef HAVE_SYS_ID_H
+#include <sys/id.h>
+#endif
+
+#define DEBUG(x, y) printf y
+#define smb_panic(x) exit(1)
+#endif
+
+/****************************************************************************
+abort if we haven't set the uid correctly
+****************************************************************************/
+static void assert_uid(uid_t ruid, uid_t euid)
+{
+ if ((euid != (uid_t)-1 && geteuid() != euid) ||
+ (ruid != (uid_t)-1 && getuid() != ruid)) {
+ DEBUG(0,("Failed to set uid privileges to (%d,%d) now set to (%d,%d)\n",
+ (int)ruid, (int)euid,
+ (int)getuid(), (int)geteuid()));
+ smb_panic("failed to set uid\n");
+ exit(1);
+ }
+}
+
+/****************************************************************************
+abort if we haven't set the gid correctly
+****************************************************************************/
+static void assert_gid(gid_t rgid, gid_t egid)
+{
+ if ((egid != (gid_t)-1 && getegid() != egid) ||
+ (rgid != (gid_t)-1 && getgid() != rgid)) {
+ DEBUG(0,("Failed to set gid privileges to (%d,%d) now set to (%d,%d) uid=(%d,%d)\n",
+ (int)rgid, (int)egid,
+ (int)getgid(), (int)getegid(),
+ (int)getuid(), (int)geteuid()));
+ smb_panic("failed to set gid\n");
+ exit(1);
+ }
+}
+
+/****************************************************************************
+ Gain root privilege before doing something.
+ We want to end up with ruid==euid==0
+****************************************************************************/
+void gain_root_privilege(void)
+{
+#if USE_SETRESUID
+ setresuid(0,0,0);
+#endif
+
+#if USE_SETEUID
+ seteuid(0);
+#endif
+
+#if USE_SETREUID
+ setreuid(0, 0);
+#endif
+
+#if USE_SETUIDX
+ setuidx(ID_EFFECTIVE, 0);
+ setuidx(ID_REAL, 0);
+#endif
+
+ /* this is needed on some systems */
+ setuid(0);
+
+ assert_uid(0, 0);
+}
+
+
+/****************************************************************************
+ Ensure our real and effective groups are zero.
+ we want to end up with rgid==egid==0
+****************************************************************************/
+void gain_root_group_privilege(void)
+{
+#if USE_SETRESUID
+ setresgid(0,0,0);
+#endif
+
+#if USE_SETREUID
+ setregid(0,0);
+#endif
+
+#if USE_SETEUID
+ setegid(0);
+#endif
+
+#if USE_SETUIDX
+ setgidx(ID_EFFECTIVE, 0);
+ setgidx(ID_REAL, 0);
+#endif
+
+ setgid(0);
+
+ assert_gid(0, 0);
+}
+
+
+/****************************************************************************
+ Set *only* the effective uid.
+ we want to end up with ruid==0 and euid==uid
+****************************************************************************/
+void set_effective_uid(uid_t uid)
+{
+#if USE_SETRESUID
+ setresuid(-1,uid,-1);
+#endif
+
+#if USE_SETREUID
+ setreuid(-1,uid);
+#endif
+
+#if USE_SETEUID
+ seteuid(uid);
+#endif
+
+#if USE_SETUIDX
+ setuidx(ID_EFFECTIVE, uid);
+#endif
+
+ assert_uid(-1, uid);
+}
+
+/****************************************************************************
+ Set *only* the effective gid.
+ we want to end up with rgid==0 and egid==gid
+****************************************************************************/
+void set_effective_gid(gid_t gid)
+{
+#if USE_SETRESUID
+ setresgid(-1,gid,-1);
+#endif
+
+#if USE_SETREUID
+ setregid(-1,gid);
+#endif
+
+#if USE_SETEUID
+ setegid(gid);
+#endif
+
+#if USE_SETUIDX
+ setgidx(ID_EFFECTIVE, gid);
+#endif
+
+ assert_gid(-1, gid);
+}
+
+static uid_t saved_euid, saved_ruid;
+
+/****************************************************************************
+ save the real and effective uid for later restoration. Used by the quotas
+ code
+****************************************************************************/
+void save_re_uid(void)
+{
+ saved_ruid = getuid();
+ saved_euid = geteuid();
+}
+
+
+/****************************************************************************
+ and restore them!
+****************************************************************************/
+void restore_re_uid(void)
+{
+ set_effective_uid(0);
+ set_effective_uid(saved_euid);
+ if (getuid() != saved_ruid) setuid(saved_ruid);
+ set_effective_uid(saved_euid);
+
+ assert_uid(saved_ruid, saved_euid);
+}
+
+/****************************************************************************
+ set the real AND effective uid to the current effective uid in a way that
+ allows root to be regained.
+ This is only possible on some platforms.
+****************************************************************************/
+int set_re_uid(void)
+{
+ uid_t uid = geteuid();
+
+#if USE_SETRESUID
+ setresuid(geteuid(), -1, -1);
+#endif
+
+#if USE_SETREUID
+ setreuid(0, 0);
+ setreuid(uid, -1);
+ setreuid(-1, uid);
+#endif
+
+#if USE_SETEUID
+ /* can't be done */
+ return -1;
+#endif
+
+#if USE_SETUIDX
+ /* can't be done */
+ return -1;
+#endif
+
+ assert_uid(uid, uid);
+ return 0;
+}
+
+
+/****************************************************************************
+ Become the specified uid and gid - permanently !
+ there should be no way back if possible
+****************************************************************************/
+void become_user_permanently(uid_t uid, gid_t gid)
+{
+ /*
+ * First - gain root privilege. We do this to ensure
+ * we can lose it again.
+ */
+
+ gain_root_privilege();
+ gain_root_group_privilege();
+
+#if USE_SETRESUID
+ setresgid(gid,gid,gid);
+ setgid(gid);
+ setresuid(uid,uid,uid);
+ setuid(uid);
+#endif
+
+#if USE_SETREUID
+ setregid(gid,gid);
+ setgid(gid);
+ setreuid(uid,uid);
+ setuid(uid);
+#endif
+
+#if USE_SETEUID
+ setegid(gid);
+ setgid(gid);
+ setuid(uid);
+ seteuid(uid);
+ setuid(uid);
+#endif
+
+#if USE_SETUIDX
+ setgidx(ID_REAL, gid);
+ setgidx(ID_EFFECTIVE, gid);
+ setgid(gid);
+ setuidx(ID_REAL, uid);
+ setuidx(ID_EFFECTIVE, uid);
+ setuid(uid);
+#endif
+
+ assert_uid(uid, uid);
+ assert_gid(gid, gid);
+}
+
+#ifdef AUTOCONF_TEST
+main()
+{
+ if (getuid() != 0) {
+#if (defined(AIX) && defined(USE_SETREUID))
+ /* setreuid is badly broken on AIX 4.1, we avoid it completely */
+ fprintf(stderr,"avoiding possibly broken setreuid\n");
+ exit(1);
+#endif
+
+ /* assume that if we have the functions then they work */
+ fprintf(stderr,"not running as root: assuming OK\n");
+ exit(0);
+ }
+
+ gain_root_privilege();
+ gain_root_group_privilege();
+ set_effective_gid(1);
+ set_effective_uid(1);
+ gain_root_privilege();
+ gain_root_group_privilege();
+ become_user_permanently(1, 1);
+ setuid(0);
+ if (getuid() == 0) {
+ fprintf(stderr,"uid not set permanently\n");
+ exit(1);
+ }
+
+ printf("OK\n");
+
+ exit(0);
+}
+#endif