diff options
Diffstat (limited to 'crypto/openssh/uidswap.c')
| -rw-r--r-- | crypto/openssh/uidswap.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/crypto/openssh/uidswap.c b/crypto/openssh/uidswap.c deleted file mode 100644 index 0a772c7b33a8..000000000000 --- a/crypto/openssh/uidswap.c +++ /dev/null @@ -1,149 +0,0 @@ -/* - * 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" -RCSID("$OpenBSD: uidswap.c,v 1.22 2002/05/28 21:24:00 stevesk Exp $"); - -#include "log.h" -#include "uidswap.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[NGROUPS_MAX], user_groups[NGROUPS_MAX]; -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_int)pw->pw_uid, (u_int)pw->pw_gid, (u_int)saved_euid); - if (saved_euid != 0) { - privileged = 0; - return; - } -#else - if (geteuid() != 0) { - privileged = 0; - return; - } -#endif /* SAVED_IDS_WORK_WITH_SETEUID */ - - privileged = 1; - temporarily_use_uid_effective = 1; - saved_egroupslen = getgroups(NGROUPS_MAX, saved_egroups); - if (saved_egroupslen < 0) - fatal("getgroups: %.100s", strerror(errno)); - - /* 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(NGROUPS_MAX, user_groups); - if (user_groupslen < 0) - fatal("getgroups: %.100s", strerror(errno)); - } - /* 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)); -} - -/* - * Restores to the original (privileged) uid. - */ -void -restore_uid(void) -{ - debug("restore_uid"); - /* it's a no-op unless privileged */ - if (!privileged) - return; - if (!temporarily_use_uid_effective) - fatal("restore_uid: temporarily_use_uid not effective"); - -#ifdef SAVED_IDS_WORK_WITH_SETEUID - /* 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) -{ - if (temporarily_use_uid_effective) - fatal("permanently_set_uid: temporarily_use_uid effective"); - if (setgid(pw->pw_gid) < 0) - fatal("setgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); - if (setuid(pw->pw_uid) < 0) - fatal("setuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); -} |