/*
- * Copyright (c) 1994-1996,1998-2006 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 1994-1996,1998-2009 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
-#ifdef HAVE_ERR_H
-# include <err.h>
-#else
-# include "emul/err.h"
-#endif /* HAVE_ERR_H */
#include <pwd.h>
#include <errno.h>
#include <grp.h>
#include "sudo.h"
-#ifndef lint
-__unused static const char rcsid[] = "$Sudo: set_perms.c,v 1.30.2.4 2007/07/06 14:16:22 millert Exp $";
-#endif /* lint */
-
#ifdef __TANDEM
# define ROOT_UID 65535
#else
* Prototypes
*/
static void runas_setup __P((void));
+static void runas_setgroups __P((void));
+static void restore_groups __P((void));
+
+static int current_perm = -1;
#ifdef HAVE_SETRESUID
/*
* 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
+int
set_perms(perm)
int perm;
{
+ const char *errstr;
+ int noexit;
+
+ noexit = ISSET(perm, PERM_NOEXIT);
+ CLR(perm, PERM_MASK);
+
+ if (perm == current_perm)
+ return(1);
+
switch (perm) {
case PERM_ROOT:
- if (setresuid(ROOT_UID, ROOT_UID, ROOT_UID))
- errx(1, "setresuid(ROOT_UID, ROOT_UID, ROOT_UID) failed, your operating system may have a broken setresuid() function\nTry running configure with --disable-setresuid");
+ if (setresuid(ROOT_UID, ROOT_UID, ROOT_UID)) {
+ errstr = "setresuid(ROOT_UID, ROOT_UID, ROOT_UID)";
+ goto bad;
+ }
(void) setresgid(-1, user_gid, -1);
+ if (current_perm == PERM_RUNAS)
+ restore_groups();
break;
case PERM_USER:
(void) setresgid(-1, user_gid, -1);
- if (setresuid(user_uid, user_uid, ROOT_UID))
- err(1, "setresuid(user_uid, user_uid, ROOT_UID)");
+ if (setresuid(user_uid, user_uid, ROOT_UID)) {
+ errstr = "setresuid(user_uid, user_uid, ROOT_UID)";
+ goto bad;
+ }
break;
case PERM_FULL_USER:
/* headed for exec() */
(void) setgid(user_gid);
- if (setresuid(user_uid, user_uid, user_uid))
- err(1, "setresuid(user_uid, user_uid, user_uid)");
+ if (setresuid(user_uid, user_uid, user_uid)) {
+ errstr = "setresuid(user_uid, user_uid, user_uid)";
+ goto bad;
+ }
break;
case PERM_RUNAS:
- (void) setresgid(-1, runas_pw->pw_gid, -1);
- if (setresuid(-1, runas_pw->pw_uid, -1))
- err(1, "unable to change to runas uid");
+ runas_setgroups();
+ (void) setresgid(-1, runas_gr ?
+ runas_gr->gr_gid : runas_pw->pw_gid, -1);
+ if (setresuid(-1, runas_pw ? runas_pw->pw_uid :
+ user_uid, -1)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_FULL_RUNAS:
runas_setup();
if (setresuid(def_stay_setuid ?
user_uid : runas_pw->pw_uid,
- runas_pw->pw_uid, runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ runas_pw->pw_uid, runas_pw->pw_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_SUDOERS:
/* assume euid == ROOT_UID, ruid == user */
if (setresgid(-1, SUDOERS_GID, -1))
- err(1, "unable to change to sudoers gid");
+ error(1, "unable to change to sudoers gid");
/*
* If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* work on all OS's.
*/
if (SUDOERS_UID == ROOT_UID) {
- if ((SUDOERS_MODE & 040) && setresuid(ROOT_UID, 1, ROOT_UID))
- err(1, "setresuid(ROOT_UID, 1, ROOT_UID)");
+ if ((SUDOERS_MODE & 040) && setresuid(ROOT_UID, 1, ROOT_UID)) {
+ errstr = "setresuid(ROOT_UID, 1, ROOT_UID)";
+ goto bad;
+ }
} else {
- if (setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID))
- err(1, "setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID)");
+ if (setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID)) {
+ errstr = "setresuid(ROOT_UID, SUDOERS_UID, ROOT_UID)";
+ goto bad;
+ }
}
break;
case PERM_TIMESTAMP:
- if (setresuid(ROOT_UID, timestamp_uid, ROOT_UID))
- err(1, "setresuid(ROOT_UID, timestamp_uid, ROOT_UID)");
+ if (setresuid(ROOT_UID, timestamp_uid, ROOT_UID)) {
+ errstr = "setresuid(ROOT_UID, timestamp_uid, ROOT_UID)";
+ goto bad;
+ }
break;
}
+
+ current_perm = perm;
+ return(1);
+bad:
+ warningx("%s: %s", errstr,
+ errno == EAGAIN ? "too many processes" : strerror(errno));
+ if (noexit)
+ return(0);
+ exit(1);
}
#else
* we are headed for an exec().
* This version of set_perms() works fine with the "stay_setuid" option.
*/
-void
+int
set_perms(perm)
int perm;
{
+ const char *errstr;
+ int noexit;
+
+ noexit = ISSET(perm, PERM_NOEXIT);
+ CLR(perm, PERM_MASK);
+
+ if (perm == current_perm)
+ return(1);
+
switch (perm) {
case PERM_ROOT:
- if (setreuid(-1, ROOT_UID))
- errx(1, "setreuid(-1, ROOT_UID) failed, your operating system may have a broken setreuid() function\nTry running configure with --disable-setreuid");
- if (setuid(ROOT_UID))
- err(1, "setuid(ROOT_UID)");
+ if (setreuid(-1, ROOT_UID)) {
+ errstr = "setreuid(-1, ROOT_UID)";
+ goto bad;
+ }
+ if (setuid(ROOT_UID)) {
+ errstr = "setuid(ROOT_UID)";
+ goto bad;
+ }
(void) setregid(-1, user_gid);
+ if (current_perm == PERM_RUNAS)
+ restore_groups();
break;
case PERM_USER:
(void) setregid(-1, user_gid);
- if (setreuid(ROOT_UID, user_uid))
- err(1, "setreuid(ROOT_UID, user_uid)");
+ if (setreuid(ROOT_UID, user_uid)) {
+ errstr = "setreuid(ROOT_UID, user_uid)";
+ goto bad;
+ }
break;
case PERM_FULL_USER:
/* headed for exec() */
(void) setgid(user_gid);
- if (setreuid(user_uid, user_uid))
- err(1, "setreuid(user_uid, user_uid)");
+ if (setreuid(user_uid, user_uid)) {
+ errstr = "setreuid(user_uid, user_uid)";
+ goto bad;
+ }
break;
case PERM_RUNAS:
- (void) setregid(-1, runas_pw->pw_gid);
- if (setreuid(-1, runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ runas_setgroups();
+ (void) setregid(-1, runas_gr ?
+ runas_gr->gr_gid : runas_pw->pw_gid);
+ if (setreuid(-1,
+ runas_pw ? runas_pw->pw_uid : user_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_FULL_RUNAS:
/* headed for exec(), assume euid == ROOT_UID */
runas_setup();
if (setreuid(def_stay_setuid ? user_uid :
- runas_pw->pw_uid, runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ runas_pw->pw_uid, runas_pw->pw_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_SUDOERS:
/* assume euid == ROOT_UID, ruid == user */
if (setregid(-1, SUDOERS_GID))
- err(1, "unable to change to sudoers gid");
+ error(1, "unable to change to sudoers gid");
/*
* If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* work on all OS's.
*/
if (SUDOERS_UID == ROOT_UID) {
- if ((SUDOERS_MODE & 040) && setreuid(ROOT_UID, 1))
- err(1, "setreuid(ROOT_UID, 1)");
+ if ((SUDOERS_MODE & 040) && setreuid(ROOT_UID, 1)) {
+ errstr = "setreuid(ROOT_UID, 1)";
+ goto bad;
+ }
} else {
- if (setreuid(ROOT_UID, SUDOERS_UID))
- err(1, "setreuid(ROOT_UID, SUDOERS_UID)");
+ if (setreuid(ROOT_UID, SUDOERS_UID)) {
+ errstr = "setreuid(ROOT_UID, SUDOERS_UID)";
+ goto bad;
+ }
}
break;
case PERM_TIMESTAMP:
- if (setreuid(ROOT_UID, timestamp_uid))
- err(1, "setreuid(ROOT_UID, timestamp_uid)");
+ if (setreuid(ROOT_UID, timestamp_uid)) {
+ errstr = "setreuid(ROOT_UID, timestamp_uid)";
+ goto bad;
+ }
break;
}
+
+ current_perm = perm;
+ return(1);
+bad:
+ warningx("%s: %s", errstr,
+ errno == EAGAIN ? "too many processes" : strerror(errno));
+ if (noexit)
+ return(0);
+ exit(1);
}
# else /* !HAVE_SETRESUID && !HAVE_SETREUID */
* Set real and effective uids and gids based on perm.
* NOTE: does not support the "stay_setuid" option.
*/
-void
+int
set_perms(perm)
int perm;
{
+ const char *errstr;
+ int noexit;
+
+ noexit = ISSET(perm, PERM_NOEXIT);
+ CLR(perm, PERM_MASK);
+
+ if (perm == current_perm)
+ return(1);
+
/*
* Since we only have setuid() and seteuid() and semantics
* for these calls differ on various systems, we set
* real and effective uids to ROOT_UID initially to be safe.
*/
- if (seteuid(ROOT_UID))
- err(1, "seteuid(ROOT_UID)");
- if (setuid(ROOT_UID))
- err(1, "setuid(ROOT_UID)");
+ if (seteuid(ROOT_UID)) {
+ errstr = "seteuid(ROOT_UID)";
+ goto bad;
+ }
+ if (setuid(ROOT_UID)) {
+ errstr = "setuid(ROOT_UID)";
+ goto bad;
+ }
switch (perm) {
case PERM_ROOT:
/* uid set above */
(void) setegid(user_gid);
+ if (current_perm == PERM_RUNAS)
+ restore_groups();
break;
case PERM_USER:
(void) setegid(user_gid);
- if (seteuid(user_uid))
- err(1, "seteuid(user_uid)");
+ if (seteuid(user_uid)) {
+ errstr = "seteuid(user_uid)";
+ goto bad;
+ }
break;
case PERM_FULL_USER:
/* headed for exec() */
(void) setgid(user_gid);
- if (setuid(user_uid))
- err(1, "setuid(user_uid)");
+ if (setuid(user_uid)) {
+ errstr = "setuid(user_uid)";
+ goto bad;
+ }
break;
case PERM_RUNAS:
- (void) setegid(runas_pw->pw_gid);
- if (seteuid(runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ runas_setgroups();
+ (void) setegid(runas_gr ?
+ runas_gr->gr_gid : runas_pw->pw_gid);
+ if (seteuid(runas_pw ? runas_pw->pw_uid : user_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_FULL_RUNAS:
/* headed for exec() */
runas_setup();
- if (setuid(runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ if (setuid(runas_pw->pw_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_SUDOERS:
if (setegid(SUDOERS_GID))
- err(1, "unable to change to sudoers gid");
+ error(1, "unable to change to sudoers gid");
/*
* If SUDOERS_UID == ROOT_UID and SUDOERS_MODE
* work on all OS's.
*/
if (SUDOERS_UID == ROOT_UID) {
- if ((SUDOERS_MODE & 040) && seteuid(1))
- err(1, "seteuid(1)");
+ if ((SUDOERS_MODE & 040) && seteuid(1)) {
+ errstr = "seteuid(1)";
+ goto bad;
+ }
} else {
- if (seteuid(SUDOERS_UID))
- err(1, "seteuid(SUDOERS_UID)");
+ if (seteuid(SUDOERS_UID)) {
+ errstr = "seteuid(SUDOERS_UID)";
+ goto bad;
+ }
}
break;
case PERM_TIMESTAMP:
- if (seteuid(timestamp_uid))
- err(1, "seteuid(timestamp_uid)");
+ if (seteuid(timestamp_uid)) {
+ errstr = "seteuid(timestamp_uid)";
+ goto bad;
+ }
break;
}
+
+ current_perm = perm;
+ return(1);
+bad:
+ warningx("%s: %s", errstr,
+ errno == EAGAIN ? "too many processes" : strerror(errno));
+ if (noexit)
+ return(0);
+ exit(1);
}
# else /* !HAVE_SETRESUID && !HAVE_SETREUID && !HAVE_SETEUID */
* NOTE: does not support the "stay_setuid" or timestampowner options.
* Also, SUDOERS_UID and SUDOERS_GID are not used.
*/
-void
+int
set_perms(perm)
int perm;
{
+ const char *errstr;
+ int noexit;
+
+ noexit = ISSET(perm, PERM_NOEXIT);
+ CLR(perm, PERM_MASK);
+
+ if (perm == current_perm)
+ return(1);
switch (perm) {
case PERM_ROOT:
- if (setuid(ROOT_UID))
- err(1, "setuid(ROOT_UID)");
+ if (setuid(ROOT_UID)) {
+ errstr = "setuid(ROOT_UID)";
+ goto bad;
+ }
+ if (current_perm == PERM_RUNAS)
+ restore_groups();
break;
case PERM_FULL_USER:
(void) setgid(user_gid);
- if (setuid(user_uid))
- err(1, "setuid(user_uid)");
+ if (setuid(user_uid)) {
+ errstr = "setuid(user_uid)";
+ goto bad;
+ }
break;
case PERM_FULL_RUNAS:
runas_setup();
- if (setuid(runas_pw->pw_uid))
- err(1, "unable to change to runas uid");
+ if (setuid(runas_pw->pw_uid)) {
+ errstr = "unable to change to runas uid";
+ goto bad;
+ }
break;
case PERM_USER:
/* Unsupported since we can't set euid. */
break;
}
+
+ current_perm = perm;
+ return(1);
+bad:
+ warningx("%s: %s", errstr,
+ errno == EAGAIN ? "too many processes" : strerror(errno));
+ if (noexit)
+ return(0);
+ exit(1);
}
# endif /* HAVE_SETEUID */
# endif /* HAVE_SETREUID */
#endif /* HAVE_SETRESUID */
+#ifdef HAVE_INITGROUPS
+static void
+runas_setgroups()
+{
+ static int ngroups = -1;
+#ifdef HAVE_GETGROUPS
+ static GETGROUPS_T *groups;
+#endif
+ struct passwd *pw;
+
+ if (def_preserve_groups)
+ return;
+
+ /*
+ * Use stashed copy of runas groups if available, else initgroups and stash.
+ */
+ if (ngroups == -1) {
+ pw = runas_pw ? runas_pw : sudo_user.pw;
+ if (initgroups(pw->pw_name, pw->pw_gid) < 0)
+ log_error(USE_ERRNO|MSG_ONLY, "can't set runas group vector");
+#ifdef HAVE_GETGROUPS
+ if ((ngroups = getgroups(0, NULL)) > 0) {
+ groups = emalloc2(ngroups, sizeof(GETGROUPS_T));
+ if (getgroups(ngroups, groups) < 0)
+ log_error(USE_ERRNO|MSG_ONLY, "can't get runas group vector");
+ }
+ } else {
+ if (setgroups(ngroups, groups) < 0)
+ log_error(USE_ERRNO|MSG_ONLY, "can't set runas group vector");
+#endif /* HAVE_GETGROUPS */
+ }
+}
+
+static void
+restore_groups()
+{
+ if (setgroups(user_ngroups, user_groups) < 0)
+ log_error(USE_ERRNO|MSG_ONLY, "can't reset user group vector");
+}
+
+#else
+
+static void
+runas_setgroups()
+{
+ /* STUB */
+}
+
+static void
+restore_groups()
+{
+ /* STUB */
+}
+
+#endif /* HAVE_INITGROUPS */
+
static void
runas_setup()
{
+ gid_t gid;
#ifdef HAVE_LOGIN_CAP_H
int flags;
extern login_cap_t *lc;
#endif
if (runas_pw->pw_name != NULL) {
+ gid = runas_gr ? runas_gr->gr_gid : runas_pw->pw_gid;
+#ifdef HAVE_GETUSERATTR
+ aix_setlimits(runas_pw->pw_name);
+#endif
#ifdef HAVE_PAM
pam_prep_user(runas_pw);
#endif /* HAVE_PAM */
#ifdef HAVE_LOGIN_CAP_H
if (def_use_loginclass) {
/*
- * We don't have setusercontext() set the user since we
- * may only want to set the effective uid. Depending on
- * sudoers and/or command line arguments we may not want
- * setusercontext() to call initgroups().
+ * We only use setusercontext() to set the nice value and rlimits.
*/
flags = LOGIN_SETRESOURCES|LOGIN_SETPRIORITY;
- if (!def_preserve_groups)
- SET(flags, LOGIN_SETGROUP);
- else if (setgid(runas_pw->pw_gid))
- warn("cannot set gid to runas gid");
if (setusercontext(lc, runas_pw, runas_pw->pw_uid, flags)) {
if (runas_pw->pw_uid != ROOT_UID)
- err(1, "unable to set user context");
+ error(1, "unable to set user context");
else
- warn("unable to set user context");
+ warning("unable to set user context");
}
- } else
-#endif /* HAVE_LOGIN_CAP_H */
- {
- if (setgid(runas_pw->pw_gid))
- warn("cannot set gid to runas gid");
-#ifdef HAVE_INITGROUPS
- /*
- * Initialize group vector unless asked not to.
- */
- if (!def_preserve_groups &&
- initgroups(*user_runas, runas_pw->pw_gid) < 0)
- warn("cannot set group vector");
-#endif /* HAVE_INITGROUPS */
}
+#endif /* HAVE_LOGIN_CAP_H */
+ /*
+ * Initialize group vector
+ */
+ runas_setgroups();
+#ifdef HAVE_SETEUID
+ if (setegid(gid))
+ warning("cannot set egid to runas gid");
+#endif
+ if (setgid(gid))
+ warning("cannot set gid to runas gid");
}
}
projects / debian / sudo / blobdiff