Replace all uses of setXX[ug]id() and setgroups with samba_setXX[ug]id() calls.

Will allow thread-specific credentials to be added by modifying
the central definitions. Deliberately left the setXX[ug]id()
call in popt as this is not used in Samba.

18 files changed, 362 insertions, 112 deletions

diff --git a/lib/uid_wrapper/uid_wrapper.c b/lib/uid_wrapper/uid_wrapper.c
index 898d1afbb9..7a85a9563a 100644
--- a/lib/uid_wrapper/uid_wrapper.c
+++ b/lib/uid_wrapper/uid_wrapper.c
@@ -22,6 +22,7 @@
 #include "replace.h"
 #include "system/passwd.h"
 #include <talloc.h>
+#include "../lib/util/setid.h"
 
 #else /* _SAMBA_BUILD_ */
 
@@ -72,7 +73,7 @@ _PUBLIC_ int uwrap_seteuid(uid_t euid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return seteuid(euid);
+		return samba_seteuid(euid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (euid == 0) {
@@ -89,7 +90,7 @@ _PUBLIC_ int uwrap_setreuid(uid_t ruid, uid_t euid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setreuid(ruid, euid);
+		return samba_setreuid(ruid, euid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (euid == 0) {
@@ -106,7 +107,7 @@ _PUBLIC_ int uwrap_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setresuid(ruid, euid, suid);
+		return samba_setresuid(ruid, euid, suid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (euid == 0) {
@@ -132,7 +133,7 @@ _PUBLIC_ int uwrap_setegid(gid_t egid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setegid(egid);
+		return samba_setegid(egid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (egid == 0) {
@@ -149,7 +150,7 @@ _PUBLIC_ int uwrap_setregid(gid_t rgid, gid_t egid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setregid(rgid, egid);
+		return samba_setregid(rgid, egid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (egid == 0) {
@@ -166,7 +167,7 @@ _PUBLIC_ int uwrap_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setresgid(rgid, egid, sgid);
+		return samba_setresgid(rgid, egid, sgid);
 	}
 	/* assume for now that the ruid stays as root */
 	if (egid == 0) {
@@ -191,7 +192,7 @@ _PUBLIC_ int uwrap_setgroups(size_t size, const gid_t *list)
 {
 	uwrap_init();
 	if (!uwrap.enabled) {
-		return setgroups(size, list);
+		return samba_setgroups(size, list);
 	}
 
 	talloc_free(uwrap.groups);
diff --git a/lib/uid_wrapper/uid_wrapper.h b/lib/uid_wrapper/uid_wrapper.h
index c59749379a..21d0795d41 100644
--- a/lib/uid_wrapper/uid_wrapper.h
+++ b/lib/uid_wrapper/uid_wrapper.h
@@ -36,35 +36,35 @@ gid_t uwrap_getgid(void);
 
 #ifdef UID_WRAPPER_REPLACE
 
-#ifdef seteuid
-#undef seteuid
+#ifdef samba_seteuid
+#undef samba_seteuid
 #endif
-#define seteuid	uwrap_seteuid
+#define samba_seteuid	uwrap_seteuid
 
-#ifdef setreuid
-#undef setreuid
+#ifdef samba_setreuid
+#undef samba_setreuid
 #endif
-#define setreuid	uwrap_setreuid
+#define samba_setreuid	uwrap_setreuid
 
-#ifdef setresuid
-#undef setresuid
+#ifdef samba_setresuid
+#undef samba_setresuid
 #endif
-#define setresuid	uwrap_setresuid
+#define samba_setresuid	uwrap_setresuid
 
-#ifdef setegid
-#undef setegid
+#ifdef samba_setegid
+#undef samba_setegid
 #endif
-#define setegid	uwrap_setegid
+#define samba_setegid	uwrap_setegid
 
-#ifdef setregid
-#undef setregid
+#ifdef samba_setregid
+#undef samba_setregid
 #endif
-#define setregid	uwrap_setregid
+#define samba_setregid	uwrap_setregid
 
-#ifdef setresgid
-#undef setresgid
+#ifdef samba_setresgid
+#undef samba_setresgid
 #endif
-#define setresgid	uwrap_setresgid
+#define samba_setresgid	uwrap_setresgid
 
 #ifdef geteuid
 #undef geteuid
@@ -76,10 +76,10 @@ gid_t uwrap_getgid(void);
 #endif
 #define getegid	uwrap_getegid
 
-#ifdef setgroups
-#undef setgroups
+#ifdef samba_setgroups
+#undef samba_setgroups
 #endif
-#define setgroups uwrap_setgroups
+#define samba_setgroups uwrap_setgroups
 
 #ifdef getgroups
 #undef getgroups
diff --git a/lib/uid_wrapper/wscript_build b/lib/uid_wrapper/wscript_build
index 54e5b80f43..76d4b17fce 100644
--- a/lib/uid_wrapper/wscript_build
+++ b/lib/uid_wrapper/wscript_build
@@ -3,7 +3,7 @@
 
 bld.SAMBA_LIBRARY('uid_wrapper',
                   source='uid_wrapper.c',
-                  deps='talloc',
+                  deps='talloc util_setid',
                   private_library=True,
                   enabled=bld.CONFIG_SET("UID_WRAPPER"),
                   )
diff --git a/lib/util/setid.c b/lib/util/setid.c
new file mode 100644
index 0000000000..8b2efc076f
--- /dev/null
+++ b/lib/util/setid.c
@@ -0,0 +1,182 @@
+/*
+   Unix SMB/CIFS implementation.
+   setXXid() functions for Samba.
+   Copyright (C) Jeremy Allison 2012
+
+   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/>.
+*/
+
+#ifndef AUTOCONF_TEST
+#include "replace.h"
+#include "system/passwd.h"
+#include "include/includes.h"
+
+#ifdef UID_WRAPPER_REPLACE
+
+#ifdef samba_seteuid
+#undef samba_seteuid
+#endif
+
+#ifdef samba_setreuid
+#undef samba_setreuid
+#endif
+
+#ifdef samba_setresuid
+#undef samba_setresuid
+#endif
+
+#ifdef samba_setegid
+#undef samba_setegid
+#endif
+
+#ifdef samba_setregid
+#undef samba_setregid
+#endif
+
+#ifdef samba_setresgid
+#undef samba_setresgid
+#endif
+
+#ifdef samba_setgroups
+#undef samba_setgroups
+#endif
+
+/* uid_wrapper will have redefined these. */
+int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid);
+int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
+int samba_setreuid(uid_t ruid, uid_t euid);
+int samba_setregid(gid_t rgid, gid_t egid);
+int samba_seteuid(uid_t euid);
+int samba_setegid(gid_t egid);
+int samba_setuid(uid_t uid);
+int samba_setgid(gid_t gid);
+int samba_setuidx(int flags, uid_t uid);
+int samba_setgidx(int flags, gid_t gid);
+int samba_setgroups(size_t setlen, const gid_t *gidset);
+
+#endif
+#endif
+
+#include "../lib/util/setid.h"
+
+/* All the setXX[ug]id functions and setgroups Samba uses. */
+int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid)
+{
+#if defined(HAVE_SETRESUID)
+	return setresuid(ruid, euid, suid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
+{
+#if defined(HAVE_SETRESGID)
+	return setresgid(rgid, egid, sgid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setreuid(uid_t ruid, uid_t euid)
+{
+#if defined(HAVE_SETREUID)
+	return setreuid(ruid, euid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setregid(gid_t rgid, gid_t egid)
+{
+#if defined(HAVE_SETREGID)
+	return setregid(rgid, egid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_seteuid(uid_t euid)
+{
+#if defined(HAVE_SETEUID)
+	return seteuid(euid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setegid(gid_t egid)
+{
+#if defined(HAVE_SETEGID)
+	return setegid(egid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setuid(uid_t uid)
+{
+#if defined(HAVE_SETUID)
+	return setuid(uid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setgid(gid_t gid)
+{
+#if defined(HAVE_SETGID)
+	return setgid(gid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setuidx(int flags, uid_t uid)
+{
+#if defined(HAVE_SETUIDX)
+	return setuidx(flags, uid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setgidx(int flags, gid_t gid)
+{
+#if defined(HAVE_SETGIDX)
+	return setgidx(flags, gid);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
+
+int samba_setgroups(size_t setlen, const gid_t *gidset)
+{
+#if defined(HAVE_SETGROUPS)
+	return setgroups(setlen, gidset);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
+}
diff --git a/lib/util/setid.h b/lib/util/setid.h
new file mode 100644
index 0000000000..59ae44c4d2
--- /dev/null
+++ b/lib/util/setid.h
@@ -0,0 +1,43 @@
+/*
+   Unix SMB/CIFS implementation.
+   setXXid() functions for Samba.
+   Copyright (C) Jeremy Allison 2012
+
+   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/>.
+*/
+
+#ifndef _SETID_H
+#define _SETID_H
+
+/*
+ * NB. We don't wrap initgroups although on some systems
+ * this can call setgroups. On systems with thread-specific
+ * credentials (Linux so far) we know they have getgrouplist()
+ * which doesn't make a system call.
+ */
+
+/* All the setXX[ug]id functions and setgroups Samba uses. */
+int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid);
+int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
+int samba_setreuid(uid_t ruid, uid_t euid);
+int samba_setregid(gid_t rgid, gid_t egid);
+int samba_seteuid(uid_t euid);
+int samba_setegid(gid_t egid);
+int samba_setuid(uid_t uid);
+int samba_setgid(gid_t gid);
+int samba_setuidx(int flags, uid_t uid);
+int samba_setgidx(int flags, gid_t gid);
+int samba_setgroups(size_t setlen, const gid_t *gidset);
+
+#endif
diff --git a/lib/util/unix_privs.c b/lib/util/unix_privs.c
index baa54fd558..3dd244dad1 100644
--- a/lib/util/unix_privs.c
+++ b/lib/util/unix_privs.c
@@ -22,6 +22,7 @@
 #include "includes.h"
 #include "system/passwd.h"
 #include "../lib/util/unix_privs.h"
+#include "../lib/util/setid.h"
 
 /**
  * @file
@@ -52,7 +53,7 @@ struct saved_state {
 static int privileges_destructor(struct saved_state *s)
 {
 	if (geteuid() != s->uid &&
-	    seteuid(s->uid) != 0) {
+	    samba_seteuid(s->uid) != 0) {
 		smb_panic("Failed to restore privileges");
 	}
 	return 0;
@@ -71,7 +72,7 @@ void *root_privileges(void)
 	if (!s) return NULL;
 	s->uid = geteuid();
 	if (s->uid != 0) {
-		seteuid(0);
+		samba_seteuid(0);
 	}
 	talloc_set_destructor(s, privileges_destructor);
 	return s;
diff --git a/lib/util/wscript_build b/lib/util/wscript_build
index 82943a08f2..e601ecd4ed 100755
--- a/lib/util/wscript_build
+++ b/lib/util/wscript_build
@@ -9,7 +9,7 @@ bld.SAMBA_LIBRARY('samba-util',
                     util_str.c util_str_common.c substitute.c ms_fnmatch.c
                     server_id.c dprintf.c parmlist.c bitmap.c''',
                   deps='DYNCONFIG',
-                  public_deps='talloc execinfo uid_wrapper pthread LIBCRYPTO charset',
+                  public_deps='talloc execinfo uid_wrapper pthread LIBCRYPTO charset util_setid',
                   public_headers='debug.h attr.h byteorder.h data_blob.h memory.h safe_string.h time.h talloc_stack.h xfile.h dlinklist.h samba_util.h string_wrappers.h',
                   header_path= [ ('dlinklist.h samba_util.h', '.'), ('*', 'util') ],
                   local_include=False,
@@ -62,6 +62,11 @@ bld.SAMBA_LIBRARY('tevent-util',
 	vnum='0.0.1'
 	)
 
+bld.SAMBA_LIBRARY('util_setid',
+	source='setid.c',
+	local_include=False,
+	private_library=True
+	)
 
 bld.SAMBA_SUBSYSTEM('util_ldb',
 		    source='util_ldb.c',
diff --git a/source3/Makefile.in b/source3/Makefile.in
index 41f668358b..d9c4df3310 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -433,7 +433,8 @@ UTIL_OBJ = ../lib/util/rbtree.o ../lib/util/signal.o ../lib/util/time.o \
 		   lib/tevent_barrier.o \
 		   ../lib/util/smb_threads.o ../lib/util/util_id.o \
 		   ../lib/util/blocking.o ../lib/util/rfc1738.o \
-		   ../lib/util/select.o ../lib/util/util_pw.o ../lib/util/server_id.o
+		   ../lib/util/select.o ../lib/util/util_pw.o ../lib/util/server_id.o \
+		   ../lib/util/setid.o
 
 CRYPTO_OBJ = ../lib/crypto/crc32.o @CRYPTO_MD5_OBJ@ \
 			 ../lib/crypto/hmacmd5.o ../lib/crypto/arcfour.o \
@@ -1319,7 +1320,7 @@ LOCKTEST_OBJ = torture/locktest.o $(PARAM_OBJ) $(LOCKING_OBJ) $(KRBCLIENT_OBJ) \
 		$(LIBSMB_OBJ) $(LIB_NONSMBD_OBJ) \
 		$(LIBMSRPC_OBJ) $(LIBMSRPC_GEN_OBJ) $(FNAME_UTIL_OBJ)
 
-NSSTEST_OBJ = ../nsswitch/nsstest.o $(LIBSAMBAUTIL_OBJ)
+NSSTEST_OBJ = ../nsswitch/nsstest.o ../lib/util/setid.o $(LIBSAMBAUTIL_OBJ)
 
 PDBTEST_OBJ = torture/pdbtest.o $(PARAM_OBJ) $(LIBSMB_OBJ) $(KRBCLIENT_OBJ) \
 		$(LIB_NONSMBD_OBJ) $(PASSDB_OBJ) $(GROUPDB_OBJ) \
@@ -1602,6 +1603,7 @@ VLP_OBJ = printing/tests/vlp.o \
           ../lib/util/util_str_common.o \
           ../lib/util/data_blob.o \
           ../dynconfig/dynconfig.o \
+	  ../lib/util/setid.o \
 	  $(LIBSAMBAUTIL_OBJ) \
 	  param/util.o
 
diff --git a/source3/include/includes.h b/source3/include/includes.h
index cb60dd2152..d621b7e4c0 100644
--- a/source3/include/includes.h
+++ b/source3/include/includes.h
@@ -412,6 +412,9 @@ typedef char fstring[FSTRING_LEN];
 #include "../lib/util/smb_threads.h"
 #include "../lib/util/smb_threads_internal.h"
 
+/* samba_setXXid functions. */
+#include "../lib/util/setid.h"
+
 /***** prototypes *****/
 #ifndef NO_PROTO_H
 #include "proto.h"
diff --git a/source3/lib/system.c b/source3/lib/system.c
index 3daa041a27..fe8aec317d 100644
--- a/source3/lib/system.c
+++ b/source3/lib/system.c
@@ -25,6 +25,7 @@
 #include "system/capability.h"
 #include "system/passwd.h"
 #include "system/filesys.h"
+#include "../lib/util/setid.h"
 
 #ifdef HAVE_SYS_SYSCTL_H
 #include <sys/sysctl.h>
@@ -956,7 +957,7 @@ static int sys_broken_setgroups(int setlen, gid_t *gidset)
 	for(i = 0; i < setlen; i++) 
 		group_list[i] = (GID_T) gidset[i]; 
 
-	if(setgroups(setlen, group_list) != 0) {
+	if(samba_setgroups(setlen, group_list) != 0) {
 		int saved_errno = errno;
 		SAFE_FREE(group_list);
 		errno = saved_errno;
@@ -993,7 +994,7 @@ static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
 
 	/* No group list, just make sure we are setting the efective GID. */
 	if (setlen == 0) {
-		return setgroups(1, &primary_gid);
+		return samba_setgroups(1, &primary_gid);
 	}
 
 	/* If the primary gid is not the first array element, grow the array
@@ -1019,7 +1020,7 @@ static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
 #if defined(HAVE_BROKEN_GETGROUPS)
 	ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
 #else
-	ret = setgroups(setlen, new_gidset ? new_gidset : gidset);
+	ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
 #endif
 
 	if (new_gidset) {
@@ -1062,7 +1063,7 @@ int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
 #elif defined(HAVE_BROKEN_GETGROUPS)
 	return sys_broken_setgroups(setlen, gidset);
 #else
-	return setgroups(setlen, gidset);
+	return samba_setgroups(setlen, gidset);
 #endif
 }
 
diff --git a/source3/lib/system_smbd.c b/source3/lib/system_smbd.c
index 634f88ea9c..10d7f38d52 100644
--- a/source3/lib/system_smbd.c
+++ b/source3/lib/system_smbd.c
@@ -26,6 +26,7 @@
 #include "includes.h"
 #include "system/passwd.h"
 #include "nsswitch/winbind_client.h"
+#include "../lib/util/setid.h"
 
 #ifndef HAVE_GETGROUPLIST
 
@@ -130,7 +131,7 @@ static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
 	   return from getgroups() */
 	save_re_gid();
 	set_effective_gid(gid);
-	setgid(gid);
+	samba_setgid(gid);
 
 	num_gids = getgroups(0, NULL);
 	if (num_gids == -1) {
diff --git a/source3/lib/util_sec.c b/source3/lib/util_sec.c
index 60ea214d26..bbb75dbbd4 100644
--- a/source3/lib/util_sec.c
+++ b/source3/lib/util_sec.c
@@ -20,6 +20,8 @@
 #ifndef AUTOCONF_TEST
 #include "includes.h"
 #include "system/passwd.h" /* uid_wrapper */
+#include "../lib/util/setid.h"
+
 #else
 /* we are running this code in autoconf test mode to see which type of setuid
    function works */
@@ -38,6 +40,9 @@
 #include <sys/id.h>
 #endif
 
+/* In autoconf/test mode include the definitions of samba_setXXX. */
+#include "../lib/util/setid.c"
+
 #define DEBUG(x, y) printf y
 #define smb_panic(x) exit(1)
 #define bool int
@@ -130,24 +135,24 @@ static void assert_gid(gid_t rgid, gid_t egid)
 void gain_root_privilege(void)
 {	
 #if USE_SETRESUID
-	setresuid(0,0,0);
+	samba_setresuid(0,0,0);
 #endif
     
 #if USE_SETEUID
-	seteuid(0);
+	samba_seteuid(0);
 #endif
 
 #if USE_SETREUID
-	setreuid(0, 0);
+	samba_setreuid(0, 0);
 #endif
 
 #if USE_SETUIDX
-	setuidx(ID_EFFECTIVE, 0);
-	setuidx(ID_REAL, 0);
+	samba_setuidx(ID_EFFECTIVE, 0);
+	samba_setuidx(ID_REAL, 0);
 #endif
 
 	/* this is needed on some systems */
-	setuid(0);
+	samba_setuid(0);
 
 	assert_uid(0, 0);
 }
@@ -160,23 +165,23 @@ void gain_root_privilege(void)
 void gain_root_group_privilege(void)
 {
 #if USE_SETRESUID
-	setresgid(0,0,0);
+	samba_setresgid(0,0,0);
 #endif
 
 #if USE_SETREUID
-	setregid(0,0);
+	samba_setregid(0,0);
 #endif
 
 #if USE_SETEUID
-	setegid(0);
+	samba_setegid(0);
 #endif
 
 #if USE_SETUIDX
-	setgidx(ID_EFFECTIVE, 0);
-	setgidx(ID_REAL, 0);
+	samba_setgidx(ID_EFFECTIVE, 0);
+	samba_setgidx(ID_REAL, 0);
 #endif
 
-	setgid(0);
+	samba_setgid(0);
 
 	assert_gid(0, 0);
 }
@@ -198,9 +203,9 @@ void set_effective_uid(uid_t uid)
 {
 #if USE_SETRESUID
         /* Set the effective as well as the real uid. */
-	if (setresuid(uid,uid,-1) == -1) {
+	if (samba_setresuid(uid,uid,-1) == -1) {
 		if (errno == EAGAIN) {
-			DEBUG(0, ("setresuid failed with EAGAIN. uid(%d) "
+			DEBUG(0, ("samba_setresuid failed with EAGAIN. uid(%d) "
 				  "might be over its NPROC limit\n",
 				  (int)uid));
 		}
@@ -208,15 +213,15 @@ void set_effective_uid(uid_t uid)
 #endif
 
 #if USE_SETREUID
-	setreuid(-1,uid);
+	samba_setreuid(-1,uid);
 #endif
 
 #if USE_SETEUID
-	seteuid(uid);
+	samba_seteuid(uid);
 #endif
 
 #if USE_SETUIDX
-	setuidx(ID_EFFECTIVE, uid);
+	samba_setuidx(ID_EFFECTIVE, uid);
 #endif
 
 	assert_uid(-1, uid);
@@ -229,19 +234,19 @@ void set_effective_uid(uid_t uid)
 void set_effective_gid(gid_t gid)
 {
 #if USE_SETRESUID
-	setresgid(-1,gid,-1);
+	samba_setresgid(-1,gid,-1);
 #endif
 
 #if USE_SETREUID
-	setregid(-1,gid);
+	samba_setregid(-1,gid);
 #endif
 
 #if USE_SETEUID
-	setegid(gid);
+	samba_setegid(gid);
 #endif
 
 #if USE_SETUIDX
-	setgidx(ID_EFFECTIVE, gid);
+	samba_setgidx(ID_EFFECTIVE, gid);
 #endif
 
 	assert_gid(-1, gid);
@@ -268,17 +273,17 @@ void save_re_uid(void)
 void restore_re_uid_fromroot(void)
 {
 #if USE_SETRESUID
-	setresuid(saved_ruid, saved_euid, -1);
+	samba_setresuid(saved_ruid, saved_euid, -1);
 #elif USE_SETREUID
-	setreuid(saved_ruid, -1);
-	setreuid(-1,saved_euid);
+	samba_setreuid(saved_ruid, -1);
+	samba_setreuid(-1,saved_euid);
 #elif USE_SETUIDX
-	setuidx(ID_REAL, saved_ruid);
-	setuidx(ID_EFFECTIVE, saved_euid);
+	samba_setuidx(ID_REAL, saved_ruid);
+	samba_setuidx(ID_EFFECTIVE, saved_euid);
 #else
 	set_effective_uid(saved_euid);
 	if (getuid() != saved_ruid)
-		setuid(saved_ruid);
+		samba_setuid(saved_ruid);
 	set_effective_uid(saved_euid);
 #endif
 
@@ -307,17 +312,17 @@ void save_re_gid(void)
 void restore_re_gid(void)
 {
 #if USE_SETRESUID
-	setresgid(saved_rgid, saved_egid, -1);
+	samba_setresgid(saved_rgid, saved_egid, -1);
 #elif USE_SETREUID
-	setregid(saved_rgid, -1);
-	setregid(-1,saved_egid);
+	samba_setregid(saved_rgid, -1);
+	samba_setregid(-1,saved_egid);
 #elif USE_SETUIDX
-	setgidx(ID_REAL, saved_rgid);
-	setgidx(ID_EFFECTIVE, saved_egid);
+	samba_setgidx(ID_REAL, saved_rgid);
+	samba_setgidx(ID_EFFECTIVE, saved_egid);
 #else
 	set_effective_gid(saved_egid);
 	if (getgid() != saved_rgid)
-		setgid(saved_rgid);
+		samba_setgid(saved_rgid);
 	set_effective_gid(saved_egid);
 #endif
 
@@ -335,13 +340,13 @@ int set_re_uid(void)
 	uid_t uid = geteuid();
 
 #if USE_SETRESUID
-	setresuid(geteuid(), -1, -1);
+	samba_setresuid(geteuid(), -1, -1);
 #endif
 
 #if USE_SETREUID
-	setreuid(0, 0);
-	setreuid(uid, -1);
-	setreuid(-1, uid);
+	samba_setreuid(0, 0);
+	samba_setreuid(uid, -1);
+	samba_setreuid(-1, uid);
 #endif
 
 #if USE_SETEUID
@@ -374,34 +379,34 @@ void become_user_permanently(uid_t uid, gid_t gid)
 	gain_root_group_privilege();
 
 #if USE_SETRESUID
-	setresgid(gid,gid,gid);
-	setgid(gid);
-	setresuid(uid,uid,uid);
-	setuid(uid);
+	samba_setresgid(gid,gid,gid);
+	samba_setgid(gid);
+	samba_setresuid(uid,uid,uid);
+	samba_setuid(uid);
 #endif
 
 #if USE_SETREUID
-	setregid(gid,gid);
-	setgid(gid);
-	setreuid(uid,uid);
-	setuid(uid);
+	samba_setregid(gid,gid);
+	samba_setgid(gid);
+	samba_setreuid(uid,uid);
+	samba_setuid(uid);
 #endif
 
 #if USE_SETEUID
-	setegid(gid);
-	setgid(gid);
-	setuid(uid);
-	seteuid(uid);
-	setuid(uid);
+	samba_setegid(gid);
+	samba_setgid(gid);
+	samba_setuid(uid);
+	samba_seteuid(uid);
+	samba_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);
+	samba_setgidx(ID_REAL, gid);
+	samba_setgidx(ID_EFFECTIVE, gid);
+	samba_setgid(gid);
+	samba_setuidx(ID_REAL, uid);
+	samba_setuidx(ID_EFFECTIVE, uid);
+	samba_setuid(uid);
 #endif
 	
 	assert_uid(uid, uid);
@@ -418,19 +423,19 @@ static int have_syscall(void)
 	errno = 0;
 
 #if USE_SETRESUID
-	setresuid(-1,-1,-1);
+	samba_setresuid(-1,-1,-1);
 #endif
 
 #if USE_SETREUID
-	setreuid(-1,-1);
+	samba_setreuid(-1,-1);
 #endif
 
 #if USE_SETEUID
-	seteuid(-1);
+	samba_seteuid(-1);
 #endif
 
 #if USE_SETUIDX
-	setuidx(ID_EFFECTIVE, -1);
+	samba_setuidx(ID_EFFECTIVE, -1);
 #endif
 
 	if (errno == ENOSYS) return -1;
@@ -462,7 +467,7 @@ main()
 	gain_root_privilege();
 	gain_root_group_privilege();
 	become_user_permanently(1, 1);
-	setuid(0);
+	samba_setuid(0);
 	if (getuid() == 0) {
 		fprintf(stderr,"uid not set permanently\n");
 		exit(1);
diff --git a/source3/smbd/sec_ctx.c b/source3/smbd/sec_ctx.c
index d83dbd0cb6..d73dcf422e 100644
--- a/source3/smbd/sec_ctx.c
+++ b/source3/smbd/sec_ctx.c
@@ -24,6 +24,7 @@
 #include "libcli/security/security_token.h"
 #include "auth.h"
 #include "smbprofile.h"
+#include "../lib/util/setid.h"
 
 extern struct current_user current_user;
 
@@ -151,7 +152,7 @@ static int get_current_groups(gid_t gid, uint32_t *p_ngroups, gid_t **p_groups)
 	   returned from getgroups() (tridge) */
 	save_re_gid();
 	set_effective_gid(gid);
-	setgid(gid);
+	samba_setgid(gid);
 
 	ngroups = sys_getgroups(0,&grp);
 	if (ngroups <= 0) {
diff --git a/source3/web/cgi.c b/source3/web/cgi.c
index b861b2d780..b97ed2578c 100644
--- a/source3/web/cgi.c
+++ b/source3/web/cgi.c
@@ -24,6 +24,7 @@
 #include "intl/lang_tdb.h"
 #include "auth.h"
 #include "secrets.h"
+#include "../lib/util/setid.h"
 
 #define MAX_VARIABLES 10000
 
@@ -328,7 +329,7 @@ static void cgi_web_auth(void)
 
 	C_user = SMB_STRDUP(user);
 
-	if (!setuid(0)) {
+	if (!samba_setuid(0)) {
 		C_pass = secrets_fetch_generic("root", "SWAT");
 		if (C_pass == NULL) {
 			char *tmp_pass = NULL;
@@ -344,7 +345,7 @@ static void cgi_web_auth(void)
 			TALLOC_FREE(tmp_pass);
 		}
 	}
-	setuid(pwd->pw_uid);
+	samba_setuid(pwd->pw_uid);
 	if (geteuid() != pwd->pw_uid || getuid() != pwd->pw_uid) {
 		printf("%sFailed to become user %s - uid=%d/%d<br>%s\n", 
 		       head, user, (int)geteuid(), (int)getuid(), tail);
diff --git a/source4/include/includes.h b/source4/include/includes.h
index e60bf9035d..46b158ec08 100644
--- a/source4/include/includes.h
+++ b/source4/include/includes.h
@@ -69,4 +69,7 @@
 #include "../lib/util/smb_threads.h"
 #include "../lib/util/smb_threads_internal.h"
 
+/* samba_setXXid functions. */
+#include "../lib/util/setid.h"
+
 #endif /* _INCLUDES_H */
diff --git a/source4/ntvfs/unixuid/vfs_unixuid.c b/source4/ntvfs/unixuid/vfs_unixuid.c
index c98d3867c9..b6da79064b 100644
--- a/source4/ntvfs/unixuid/vfs_unixuid.c
+++ b/source4/ntvfs/unixuid/vfs_unixuid.c
@@ -28,6 +28,7 @@
 #include "libcli/wbclient/wbclient.h"
 #define TEVENT_DEPRECATED
 #include <tevent.h>
+#include "../lib/util/setid.h"
 
 NTSTATUS ntvfs_unixuid_init(void);
 
@@ -73,15 +74,15 @@ static struct security_unix_token *save_unix_security(TALLOC_CTX *mem_ctx)
 */
 static NTSTATUS set_unix_security(struct security_unix_token *sec)
 {
-	seteuid(0);
+	samba_seteuid(0);
 
-	if (setgroups(sec->ngroups, sec->groups) != 0) {
+	if (samba_setgroups(sec->ngroups, sec->groups) != 0) {
 		return NT_STATUS_ACCESS_DENIED;
 	}
-	if (setegid(sec->gid) != 0) {
+	if (samba_setegid(sec->gid) != 0) {
 		return NT_STATUS_ACCESS_DENIED;
 	}
-	if (seteuid(sec->uid) != 0) {
+	if (samba_seteuid(sec->uid) != 0) {
 		return NT_STATUS_ACCESS_DENIED;
 	}
 	return NT_STATUS_OK;
@@ -115,7 +116,7 @@ static int unixuid_event_nesting_hook(struct tevent_context *ev,
 			return -1;
 		}
 		*(struct security_unix_token **)stack_ptr = sec_ctx;
-		if (seteuid(0) != 0 || setegid(0) != 0) {
+		if (samba_seteuid(0) != 0 || samba_setegid(0) != 0) {
 			DEBUG(0,("%s: Failed to change to root\n", location));
 			return -1;			
 		}
diff --git a/testsuite/smbd/sec_ctx1.c b/testsuite/smbd/sec_ctx1.c
index a6e61d1a32..ab85ae16e5 100644
--- a/testsuite/smbd/sec_ctx1.c
+++ b/testsuite/smbd/sec_ctx1.c
@@ -26,8 +26,8 @@ int main (int argc, char **argv)
 {
 	/* Become a non-root user */
 
-	setuid(1);
-	setgid(1);
+	samba_setuid(1);
+	samba_setgid(1);
 
 	/* Try to push a security context.  This should fail with a
 	   smb_assert() error. */
diff --git a/testsuite/smbd/sec_ctx_nonroot.c b/testsuite/smbd/sec_ctx_nonroot.c
index b31aeb0906..6d4dbf3443 100644
--- a/testsuite/smbd/sec_ctx_nonroot.c
+++ b/testsuite/smbd/sec_ctx_nonroot.c
@@ -27,8 +27,8 @@ int main (int argc, char **argv)
 	
 	/* Become a non-root user */
 
-	setuid(1);
-	setgid(1);
+	samba_setuid(1);
+	samba_setgid(1);
 
 	/* Try to push a security context.  This should fail with a
 	   smb_assert() error. */