/*
- * Copyright (c) 1994-1996,1998-2001 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 1994-1996,1998-2004 Todd C. Miller <Todd.Miller@courtesan.com>
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
*
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * 4. Products derived from this software may not be called "Sudo" nor
- * may "Sudo" appear in their names without specific prior written
- * permission from the author.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include "config.h"
#include "sudo.h"
#ifndef lint
-static const char rcsid[] = "$Sudo: set_perms.c,v 1.12 2002/01/22 02:00:25 millert Exp $";
+static const char rcsid[] = "$Sudo: set_perms.c,v 1.30 2004/05/27 23:12:02 millert Exp $";
#endif /* lint */
+#ifdef __TANDEM
+# define ROOT_UID 65535
+#else
+# define ROOT_UID 0
+#endif
+
/*
* Prototypes
*/
static void runas_setup __P((void));
static void fatal __P((char *, int));
-#if !defined(NO_SAVED_IDS) && defined(_SC_SAVED_IDS) && defined(_SC_VERSION)
+#if !defined(HAVE_SETRESUID) && !defined(HAVE_SETREUID) && \
+ !defined(NO_SAVED_IDS) && defined(_SC_SAVED_IDS) && defined(_SC_VERSION)
/*
* Set real and effective uids and gids based on perm.
* Since we have POSIX saved IDs we can get away with just
* toggling the effective uid/gid unless we are headed for an exec().
*/
void
-set_perms_posix(perm, sudo_mode)
+set_perms_posix(perm)
int perm;
- int sudo_mode;
{
int error;
switch (perm) {
case PERM_ROOT:
- if (seteuid(0))
- fatal("seteuid(0) failed, your operating system may have broken POSIX saved ID support\nTry running configure with --disable-saved-ids", 0);
+ if (seteuid(ROOT_UID))
+ fatal("seteuid(ROOT_UID) failed, your operating system may have broken POSIX saved ID support\nTry running configure with --disable-saved-ids", 0);
break;
case PERM_FULL_ROOT:
/* headed for exec() */
- (void) seteuid(0);
- if (setuid(0))
- fatal("setuid(0)", 1);
+ (void) seteuid(ROOT_UID);
+ if (setuid(ROOT_UID))
+ fatal("setuid(ROOT_UID)", 1);
break;
case PERM_USER:
break;
case PERM_RUNAS:
- /* headed for exec(), assume euid == 0 */
+ if (seteuid(runas_pw->pw_uid))
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_FULL_RUNAS:
+ /* headed for exec(), assume euid == ROOT_UID */
runas_setup();
- if (def_flag(I_STAY_SETUID))
+ if (def_stay_setuid)
error = seteuid(runas_pw->pw_uid);
else
error = setuid(runas_pw->pw_uid);
break;
case PERM_SUDOERS:
- /* assume euid == 0, ruid == user */
+ /* assume euid == ROOT_UID, ruid == user */
if (setegid(SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
/*
- * If SUDOERS_UID == 0 and SUDOERS_MODE
+ * If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* is group readable we use a non-zero
* uid in order to avoid NFS lossage.
* Using uid 1 is a bit bogus but should
* work on all OS's.
*/
- if (SUDOERS_UID == 0) {
+ if (SUDOERS_UID == ROOT_UID) {
if ((SUDOERS_MODE & 040) && seteuid(1))
fatal("seteuid(1)", 1);
} else {
fatal("seteuid(SUDOERS_UID)", 1);
}
break;
+ case PERM_TIMESTAMP:
+ if (seteuid(timestamp_uid))
+ fatal("seteuid(timestamp_uid)", 1);
+ break;
+
}
}
#endif /* !NO_SAVED_IDS && _SC_SAVED_IDS && _SC_VERSION */
-#ifdef HAVE_SETREUID
+#ifdef HAVE_SETRESUID
+/*
+ * Set real and effective and saved uids and gids based on perm.
+ * We always retain a saved uid of 0 unless we are headed for an exec().
+ * We only flip the effective gid since it only changes for PERM_SUDOERS.
+ * This version of set_perms() works fine with the "stay_setuid" option.
+ */
+void
+set_perms_suid(perm)
+ int perm;
+{
+ int error;
+
+ switch (perm) {
+ case PERM_FULL_ROOT:
+ case PERM_ROOT:
+ if (setresuid(ROOT_UID, ROOT_UID, ROOT_UID))
+ fatal("setresuid(ROOT_UID, ROOT_UID, ROOT_UID) failed, your operating system may have a broken setresuid() function\nTry running configure with --disable-setresuid", 0);
+ break;
+
+ case PERM_USER:
+ (void) setresgid(-1, user_gid, -1);
+ if (setresuid(user_uid, user_uid, ROOT_UID))
+ fatal("setresuid(user_uid, user_uid, ROOT_UID)", 1);
+ break;
+
+ case PERM_FULL_USER:
+ /* headed for exec() */
+ (void) setgid(user_gid);
+ if (setresuid(user_uid, user_uid, user_uid))
+ fatal("setresuid(user_uid, user_uid, user_uid)", 1);
+ break;
+
+ case PERM_RUNAS:
+ if (setresuid(-1, runas_pw->pw_uid, -1))
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_FULL_RUNAS:
+ /* headed for exec(), assume euid == ROOT_UID */
+ runas_setup();
+ error = setresuid(def_stay_setuid ?
+ user_uid : runas_pw->pw_uid,
+ runas_pw->pw_uid, runas_pw->pw_uid);
+ if (error)
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_SUDOERS:
+ /* assume euid == ROOT_UID, ruid == user */
+ if (setresgid(-1, SUDOERS_GID, -1))
+ fatal("unable to change to sudoers gid", 1);
+
+ /*
+ * If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
+ * is group readable we use a non-zero
+ * uid in order to avoid NFS lossage.
+ * Using uid 1 is a bit bogus but should
+ * work on all OS's.
+ */
+ if (SUDOERS_UID == ROOT_UID) {
+ if ((SUDOERS_MODE & 040) && setresuid(ROOT_UID, 1, ROOT_UID))
+ fatal("setresuid(ROOT_UID, 1, ROOT_UID)", 1);
+ } else {
+ if (setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID))
+ fatal("setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID)", 1);
+ }
+ break;
+ case PERM_TIMESTAMP:
+ if (setresuid(ROOT_UID, timestamp_uid, ROOT_UID))
+ fatal("setresuid(ROOT_UID, timestamp_uid, ROOT_UID)", 1);
+ break;
+ }
+}
+
+#else
+# ifdef HAVE_SETREUID
+
/*
* Set real and effective uids and gids based on perm.
- * We always retain a real or effective uid of 0 unless
+ * We always retain a real or effective uid of ROOT_UID unless
* we are headed for an exec().
+ * This version of set_perms() works fine with the "stay_setuid" option.
*/
void
-set_perms_fallback(perm, sudo_mode)
+set_perms_suid(perm)
int perm;
- int sudo_mode;
{
int error;
switch (perm) {
case PERM_FULL_ROOT:
case PERM_ROOT:
- if (setuid(0))
- fatal("setuid(0) failed, your operating system may have broken POSIX saved ID support\nTry running configure with --disable-setreuid", 0);
+ if (setreuid(-1, ROOT_UID))
+ fatal("setreuid(-1, ROOT_UID) failed, your operating system may have a broken setreuid() function\nTry running configure with --disable-setreuid", 0);
+ if (setuid(ROOT_UID))
+ fatal("setuid(ROOT_UID)", 1);
break;
case PERM_USER:
- (void) setegid(user_gid);
- if (setreuid(0, user_uid))
- fatal("setreuid(0, user_uid)", 1);
+ (void) setregid(-1, user_gid);
+ if (setreuid(ROOT_UID, user_uid))
+ fatal("setreuid(ROOT_UID, user_uid)", 1);
break;
case PERM_FULL_USER:
/* headed for exec() */
(void) setgid(user_gid);
- if (setuid(user_uid))
- fatal("setuid(user_uid)", 1);
+ if (setreuid(user_uid, user_uid))
+ fatal("setreuid(user_uid, user_uid)", 1);
break;
case PERM_RUNAS:
- /* headed for exec(), assume euid == 0 */
+ if (setreuid(-1, runas_pw->pw_uid))
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_FULL_RUNAS:
+ /* headed for exec(), assume euid == ROOT_UID */
runas_setup();
- if (def_flag(I_STAY_SETUID))
- error = setreuid(user_uid, runas_pw->pw_uid);
- else
- error = setuid(runas_pw->pw_uid);
+ error = setreuid(def_stay_setuid ?
+ user_uid : runas_pw->pw_uid,
+ runas_pw->pw_uid);
if (error)
fatal("unable to change to runas uid", 1);
break;
case PERM_SUDOERS:
- /* assume euid == 0, ruid == user */
- if (setegid(SUDOERS_GID))
+ /* assume euid == ROOT_UID, ruid == user */
+ if (setregid(-1, SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
/*
- * If SUDOERS_UID == 0 and SUDOERS_MODE
+ * If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* is group readable we use a non-zero
* uid in order to avoid NFS lossage.
* Using uid 1 is a bit bogus but should
* work on all OS's.
*/
- if (SUDOERS_UID == 0) {
- if ((SUDOERS_MODE & 040) && setreuid(0, 1))
- fatal("setreuid(0, 1)", 1);
+ if (SUDOERS_UID == ROOT_UID) {
+ if ((SUDOERS_MODE & 040) && setreuid(ROOT_UID, 1))
+ fatal("setreuid(ROOT_UID, 1)", 1);
} else {
- if (setreuid(0, SUDOERS_UID))
- fatal("setreuid(0, SUDOERS_UID)", 1);
+ if (setreuid(ROOT_UID, SUDOERS_UID))
+ fatal("setreuid(ROOT_UID, SUDOERS_UID)", 1);
}
break;
+ case PERM_TIMESTAMP:
+ if (setreuid(ROOT_UID, timestamp_uid))
+ fatal("setreuid(ROOT_UID, timestamp_uid)", 1);
+ break;
}
}
-#else
+# else
+# ifdef HAVE_SETREUID
/*
* Set real and effective uids and gids based on perm.
* NOTE: does not support the "stay_setuid" option.
*/
void
-set_perms_fallback(perm, sudo_mode)
+set_perms_nosuid(perm)
int perm;
- int sudo_mode;
{
/*
* Since we only have setuid() and seteuid() we have to set
- * real and effective uidss to 0 initially.
+ * real and effective uids to ROOT_UID initially.
*/
- if (setuid(0))
- fatal("setuid(0)", 1);
+ if (setuid(ROOT_UID))
+ fatal("setuid(ROOT_UID)", 1);
switch (perm) {
case PERM_USER:
break;
case PERM_RUNAS:
- /* headed for exec(), assume euid == 0 */
+ if (seteuid(runas_pw->pw_uid))
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_FULL_RUNAS:
+ /* headed for exec(), assume euid == ROOT_UID */
runas_setup();
if (setuid(runas_pw->pw_uid))
fatal("unable to change to runas uid", 1);
break;
case PERM_SUDOERS:
- /* assume euid == 0, ruid == user */
+ /* assume euid == ROOT_UID, ruid == user */
if (setegid(SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
/*
- * If SUDOERS_UID == 0 and SUDOERS_MODE
+ * If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* is group readable we use a non-zero
* uid in order to avoid NFS lossage.
* Using uid 1 is a bit bogus but should
* work on all OS's.
*/
- if (SUDOERS_UID == 0) {
+ if (SUDOERS_UID == ROOT_UID) {
if ((SUDOERS_MODE & 040) && seteuid(1))
fatal("seteuid(1)", 1);
} else {
fatal("seteuid(SUDOERS_UID)", 1);
}
break;
+ case PERM_TIMESTAMP:
+ if (seteuid(timestamp_uid))
+ fatal("seteuid(timestamp_uid)", 1);
+ break;
+ }
+}
+
+# else
+
+/*
+ * Set uids and gids based on perm via setuid() and setgid().
+ * NOTE: does not support the "stay_setuid" or timestampowner options.
+ * Also, SUDOERS_UID and SUDOERS_GID are not used.
+ */
+void
+set_perms_nosuid(perm)
+ int perm;
+{
+
+ switch (perm) {
+ case PERM_FULL_ROOT:
+ case PERM_ROOT:
+ if (setuid(ROOT_UID))
+ fatal("setuid(ROOT_UID)", 1);
+ break;
+
+ case PERM_FULL_USER:
+ (void) setgid(user_gid);
+ if (setuid(user_uid))
+ fatal("setuid(user_uid)", 1);
+ break;
+
+ case PERM_FULL_RUNAS:
+ runas_setup();
+ if (setuid(runas_pw->pw_uid))
+ fatal("unable to change to runas uid", 1);
+ break;
+
+ case PERM_USER:
+ case PERM_SUDOERS:
+ case PERM_RUNAS:
+ case PERM_TIMESTAMP:
+ /* Unsupported since we can't set euid. */
+ break;
}
}
-#endif /* HAVE_SETREUID */
+# endif /* HAVE_SETEUID */
+# endif /* HAVE_SETREUID */
+#endif /* HAVE_SETRESUID */
static void
runas_setup()
#endif /* HAVE_PAM */
#ifdef HAVE_LOGIN_CAP_H
- if (def_flag(I_USE_LOGINCLASS)) {
+ if (def_use_loginclass) {
/*
* We don't have setusercontext() set the user since we
* may only want to set the effective uid. Depending on
* setusercontext() to call initgroups().
*/
flags = LOGIN_SETRESOURCES|LOGIN_SETPRIORITY;
- if (!def_flag(I_PRESERVE_GROUPS))
- flags |= LOGIN_SETGROUP;
+ if (!def_preserve_groups)
+ SET(flags, LOGIN_SETGROUP);
else if (setgid(runas_pw->pw_gid))
perror("cannot set gid to runas gid");
error = setusercontext(lc, runas_pw,
runas_pw->pw_uid, flags);
- if (error)
- perror("unable to set user context");
+ if (error) {
+ if (runas_pw->pw_uid != ROOT_UID)
+ fatal("unable to set user context", 1);
+ else
+ perror("unable to set user context");
+ }
} else
#endif /* HAVE_LOGIN_CAP_H */
{
/*
* Initialize group vector unless asked not to.
*/
- if (!def_flag(I_PRESERVE_GROUPS) &&
+ if (!def_preserve_groups &&
initgroups(*user_runas, runas_pw->pw_gid) < 0)
perror("cannot set group vector");
#endif /* HAVE_INITGROUPS */
static void
fatal(str, printerr)
char *str;
+ int printerr;
{
if (str) {
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