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/*
* Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
*
* 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.
*
* 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.
*/
/*
* openssh_bsd_setres_id.c - setresuid() and setresgid() wrappers
*
* This file is part of zsh, the Z shell.
*
* It is based on the file openbsd-compat/bsd-setres_id.c in OpenSSH 7.9p1,
* which is subject to the copyright notice above. The zsh modifications are
* licensed as follows:
*
* Copyright (c) 2019 Daniel Shahaf
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Daniel Shahaf or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Daniel Shahaf and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Daniel Shahaf and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Daniel Shahaf and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "zsh.mdh"
#include "openssh_bsd_setres_id.pro"
#include <sys/types.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#ifdef __NetBSD__
/*
* On NetBSD, setreuid() does not reset the saved uid if the real uid
* is not modified. Better to use setuid() that resets all of real,
* effective and saved uids to the specified value. Same for setregid().
*/
#define BROKEN_SETREUID
#define BROKEN_SETREGID
#endif
#if defined(ZSH_IMPLEMENT_SETRESGID) || defined(BROKEN_SETRESGID)
int
setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
int ret = 0, saved_errno;
if (rgid != sgid) {
errno = ENOSYS;
return -1;
}
#if defined(ZSH_HAVE_NATIVE_SETREGID) && !defined(BROKEN_SETREGID)
if (setregid(rgid, egid) < 0) {
saved_errno = errno;
zwarnnam("setregid", "to gid %L: %e", (long)rgid, errno);
errno = saved_errno;
ret = -1;
}
#else
if (setegid(egid) < 0) {
saved_errno = errno;
zwarnnam("setegid", "to gid %L: %e", (long)(unsigned int)egid, errno);
errno = saved_errno;
ret = -1;
}
if (setgid(rgid) < 0) {
saved_errno = errno;
zwarnnam("setgid", "to gid %L: %e", (long)rgid, errno);
errno = saved_errno;
ret = -1;
}
#endif
return ret;
}
#endif
#if defined(ZSH_IMPLEMENT_SETRESUID) || defined(BROKEN_SETRESUID)
int
setresuid(uid_t ruid, uid_t euid, uid_t suid)
{
int ret = 0, saved_errno;
if (ruid != suid) {
errno = ENOSYS;
return -1;
}
#if defined(ZSH_HAVE_NATIVE_SETREUID) && !defined(BROKEN_SETREUID)
if (setreuid(ruid, euid) < 0) {
saved_errno = errno;
zwarnnam("setreuid", "to uid %L: %e", (long)ruid, errno);
errno = saved_errno;
ret = -1;
}
#else
# ifndef SETEUID_BREAKS_SETUID
if (seteuid(euid) < 0) {
saved_errno = errno;
zwarnnam("seteuid", "to uid %L: %e", (long)euid, errno);
errno = saved_errno;
ret = -1;
}
# endif
if (setuid(ruid) < 0) {
saved_errno = errno;
zwarnnam("setuid", "to uid %L: %e", (long)ruid, errno);
errno = saved_errno;
ret = -1;
}
#endif
return ret;
}
#endif
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