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author | des <des@FreeBSD.org> | 2008-07-22 19:01:18 +0000 |
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committer | des <des@FreeBSD.org> | 2008-07-22 19:01:18 +0000 |
commit | f1596419c2717cb81dd4b676d5e0cf1a3e30e98c (patch) | |
tree | 9827eb822991aa369cf5d220fce40c3d2011c19f /crypto/openssh/uidswap.c | |
parent | 666aa9cc1660793c97ef29a6cb66dfbb894dde8f (diff) | |
download | FreeBSD-src-f1596419c2717cb81dd4b676d5e0cf1a3e30e98c.zip FreeBSD-src-f1596419c2717cb81dd4b676d5e0cf1a3e30e98c.tar.gz |
Properly flatten openssh/dist.
Diffstat (limited to 'crypto/openssh/uidswap.c')
-rw-r--r-- | crypto/openssh/uidswap.c | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/crypto/openssh/uidswap.c b/crypto/openssh/uidswap.c deleted file mode 100644 index 91d878c..0000000 --- a/crypto/openssh/uidswap.c +++ /dev/null @@ -1,278 +0,0 @@ -/* $OpenBSD: uidswap.c,v 1.35 2006/08/03 03:34:42 deraadt Exp $ */ -/* - * Author: Tatu Ylonen <ylo@cs.hut.fi> - * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - * All rights reserved - * Code for uid-swapping. - * - * As far as I am concerned, the code I have written for this software - * can be used freely for any purpose. Any derived versions of this - * software must be clearly marked as such, and if the derived work is - * incompatible with the protocol description in the RFC file, it must be - * called by a name other than "ssh" or "Secure Shell". - */ - -#include "includes.h" - -#include <sys/param.h> -#include <errno.h> -#include <pwd.h> -#include <string.h> -#include <unistd.h> -#include <stdarg.h> - -#include <grp.h> - -#include "log.h" -#include "uidswap.h" -#include "xmalloc.h" - -/* - * Note: all these functions must work in all of the following cases: - * 1. euid=0, ruid=0 - * 2. euid=0, ruid!=0 - * 3. euid!=0, ruid!=0 - * Additionally, they must work regardless of whether the system has - * POSIX saved uids or not. - */ - -#if defined(_POSIX_SAVED_IDS) && !defined(BROKEN_SAVED_UIDS) -/* Lets assume that posix saved ids also work with seteuid, even though that - is not part of the posix specification. */ -#define SAVED_IDS_WORK_WITH_SETEUID -/* Saved effective uid. */ -static uid_t saved_euid = 0; -static gid_t saved_egid = 0; -#endif - -/* Saved effective uid. */ -static int privileged = 0; -static int temporarily_use_uid_effective = 0; -static gid_t *saved_egroups = NULL, *user_groups = NULL; -static int saved_egroupslen = -1, user_groupslen = -1; - -/* - * Temporarily changes to the given uid. If the effective user - * id is not root, this does nothing. This call cannot be nested. - */ -void -temporarily_use_uid(struct passwd *pw) -{ - /* Save the current euid, and egroups. */ -#ifdef SAVED_IDS_WORK_WITH_SETEUID - saved_euid = geteuid(); - saved_egid = getegid(); - debug("temporarily_use_uid: %u/%u (e=%u/%u)", - (u_int)pw->pw_uid, (u_int)pw->pw_gid, - (u_int)saved_euid, (u_int)saved_egid); -#ifndef HAVE_CYGWIN - if (saved_euid != 0) { - privileged = 0; - return; - } -#endif -#else - if (geteuid() != 0) { - privileged = 0; - return; - } -#endif /* SAVED_IDS_WORK_WITH_SETEUID */ - - privileged = 1; - temporarily_use_uid_effective = 1; - - saved_egroupslen = getgroups(0, NULL); - if (saved_egroupslen < 0) - fatal("getgroups: %.100s", strerror(errno)); - if (saved_egroupslen > 0) { - saved_egroups = xrealloc(saved_egroups, - saved_egroupslen, sizeof(gid_t)); - if (getgroups(saved_egroupslen, saved_egroups) < 0) - fatal("getgroups: %.100s", strerror(errno)); - } else { /* saved_egroupslen == 0 */ - if (saved_egroups != NULL) - xfree(saved_egroups); - } - - /* set and save the user's groups */ - if (user_groupslen == -1) { - if (initgroups(pw->pw_name, pw->pw_gid) < 0) - fatal("initgroups: %s: %.100s", pw->pw_name, - strerror(errno)); - - user_groupslen = getgroups(0, NULL); - if (user_groupslen < 0) - fatal("getgroups: %.100s", strerror(errno)); - if (user_groupslen > 0) { - user_groups = xrealloc(user_groups, - user_groupslen, sizeof(gid_t)); - if (getgroups(user_groupslen, user_groups) < 0) - fatal("getgroups: %.100s", strerror(errno)); - } else { /* user_groupslen == 0 */ - if (user_groups) - xfree(user_groups); - } - } - /* Set the effective uid to the given (unprivileged) uid. */ - if (setgroups(user_groupslen, user_groups) < 0) - fatal("setgroups: %.100s", strerror(errno)); -#ifndef SAVED_IDS_WORK_WITH_SETEUID - /* Propagate the privileged gid to all of our gids. */ - if (setgid(getegid()) < 0) - debug("setgid %u: %.100s", (u_int) getegid(), strerror(errno)); - /* Propagate the privileged uid to all of our uids. */ - if (setuid(geteuid()) < 0) - debug("setuid %u: %.100s", (u_int) geteuid(), strerror(errno)); -#endif /* SAVED_IDS_WORK_WITH_SETEUID */ - if (setegid(pw->pw_gid) < 0) - fatal("setegid %u: %.100s", (u_int)pw->pw_gid, - strerror(errno)); - if (seteuid(pw->pw_uid) == -1) - fatal("seteuid %u: %.100s", (u_int)pw->pw_uid, - strerror(errno)); -} - -void -permanently_drop_suid(uid_t uid) -{ - uid_t old_uid = getuid(); - - debug("permanently_drop_suid: %u", (u_int)uid); -#if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID) - if (setresuid(uid, uid, uid) < 0) - fatal("setresuid %u: %.100s", (u_int)uid, strerror(errno)); -#elif defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID) - if (setreuid(uid, uid) < 0) - fatal("setreuid %u: %.100s", (u_int)uid, strerror(errno)); -#else -# ifndef SETEUID_BREAKS_SETUID - if (seteuid(uid) < 0) - fatal("seteuid %u: %.100s", (u_int)uid, strerror(errno)); -# endif - if (setuid(uid) < 0) - fatal("setuid %u: %.100s", (u_int)uid, strerror(errno)); -#endif - -#ifndef HAVE_CYGWIN - /* Try restoration of UID if changed (test clearing of saved uid) */ - if (old_uid != uid && - (setuid(old_uid) != -1 || seteuid(old_uid) != -1)) - fatal("%s: was able to restore old [e]uid", __func__); -#endif - - /* Verify UID drop was successful */ - if (getuid() != uid || geteuid() != uid) { - fatal("%s: euid incorrect uid:%u euid:%u (should be %u)", - __func__, (u_int)getuid(), (u_int)geteuid(), (u_int)uid); - } -} - -/* - * Restores to the original (privileged) uid. - */ -void -restore_uid(void) -{ - /* it's a no-op unless privileged */ - if (!privileged) { - debug("restore_uid: (unprivileged)"); - return; - } - if (!temporarily_use_uid_effective) - fatal("restore_uid: temporarily_use_uid not effective"); - -#ifdef SAVED_IDS_WORK_WITH_SETEUID - debug("restore_uid: %u/%u", (u_int)saved_euid, (u_int)saved_egid); - /* Set the effective uid back to the saved privileged uid. */ - if (seteuid(saved_euid) < 0) - fatal("seteuid %u: %.100s", (u_int)saved_euid, strerror(errno)); - if (setegid(saved_egid) < 0) - fatal("setegid %u: %.100s", (u_int)saved_egid, strerror(errno)); -#else /* SAVED_IDS_WORK_WITH_SETEUID */ - /* - * We are unable to restore the real uid to its unprivileged value. - * Propagate the real uid (usually more privileged) to effective uid - * as well. - */ - setuid(getuid()); - setgid(getgid()); -#endif /* SAVED_IDS_WORK_WITH_SETEUID */ - - if (setgroups(saved_egroupslen, saved_egroups) < 0) - fatal("setgroups: %.100s", strerror(errno)); - temporarily_use_uid_effective = 0; -} - -/* - * Permanently sets all uids to the given uid. This cannot be - * called while temporarily_use_uid is effective. - */ -void -permanently_set_uid(struct passwd *pw) -{ - uid_t old_uid = getuid(); - gid_t old_gid = getgid(); - - if (pw == NULL) - fatal("permanently_set_uid: no user given"); - if (temporarily_use_uid_effective) - fatal("permanently_set_uid: temporarily_use_uid effective"); - debug("permanently_set_uid: %u/%u", (u_int)pw->pw_uid, - (u_int)pw->pw_gid); - -#if defined(HAVE_SETRESGID) && !defined(BROKEN_SETRESGID) - if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) < 0) - fatal("setresgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); -#elif defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID) - if (setregid(pw->pw_gid, pw->pw_gid) < 0) - fatal("setregid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); -#else - if (setegid(pw->pw_gid) < 0) - fatal("setegid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); - if (setgid(pw->pw_gid) < 0) - fatal("setgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); -#endif - -#if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID) - if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) < 0) - fatal("setresuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); -#elif defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID) - if (setreuid(pw->pw_uid, pw->pw_uid) < 0) - fatal("setreuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); -#else -# ifndef SETEUID_BREAKS_SETUID - if (seteuid(pw->pw_uid) < 0) - fatal("seteuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); -# endif - if (setuid(pw->pw_uid) < 0) - fatal("setuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); -#endif - -#ifndef HAVE_CYGWIN - /* Try restoration of GID if changed (test clearing of saved gid) */ - if (old_gid != pw->pw_gid && pw->pw_uid != 0 && - (setgid(old_gid) != -1 || setegid(old_gid) != -1)) - fatal("%s: was able to restore old [e]gid", __func__); -#endif - - /* Verify GID drop was successful */ - if (getgid() != pw->pw_gid || getegid() != pw->pw_gid) { - fatal("%s: egid incorrect gid:%u egid:%u (should be %u)", - __func__, (u_int)getgid(), (u_int)getegid(), - (u_int)pw->pw_gid); - } - -#ifndef HAVE_CYGWIN - /* Try restoration of UID if changed (test clearing of saved uid) */ - if (old_uid != pw->pw_uid && - (setuid(old_uid) != -1 || seteuid(old_uid) != -1)) - fatal("%s: was able to restore old [e]uid", __func__); -#endif - - /* Verify UID drop was successful */ - if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) { - fatal("%s: euid incorrect uid:%u euid:%u (should be %u)", - __func__, (u_int)getuid(), (u_int)geteuid(), - (u_int)pw->pw_uid); - } -} |