shadow/libmisc/setugid.c

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/*
* Copyright 1989 - 1994, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``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 JULIE HAUGH OR CONTRIBUTORS 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.
*/
/*
* Separated from setup.c. --marekm
*/
#include <config.h>
#include "rcsid.h"
RCSID ("$Id: setugid.c,v 1.9 2005/03/31 05:14:50 kloczek Exp $")
#include <stdio.h>
#include <grp.h>
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#include "getdef.h"
/*
* setup_uid_gid() split in two functions for PAM support -
* pam_setcred() needs to be called after initgroups(), but
* before setuid().
*/
int setup_groups (const struct passwd *info)
{
/*
* Set the real group ID to the primary group ID in the password
* file.
*/
if (setgid (info->pw_gid) == -1) {
perror ("setgid");
SYSLOG ((LOG_ERR, "bad group ID `%d' for user `%s': %m\n",
info->pw_gid, info->pw_name));
closelog ();
return -1;
}
#ifdef HAVE_INITGROUPS
/*
* For systems which support multiple concurrent groups, go get
* the group set from the /etc/group file.
*/
if (initgroups (info->pw_name, info->pw_gid) == -1) {
perror ("initgroups");
SYSLOG ((LOG_ERR, "initgroups failed for user `%s': %m\n",
info->pw_name));
closelog ();
return -1;
}
#endif
return 0;
}
int change_uid (const struct passwd *info)
{
/*
* Set the real UID to the UID value in the password file.
*/
if (setuid (info->pw_uid)) {
perror ("setuid");
SYSLOG ((LOG_ERR, "bad user ID `%d' for user `%s': %m\n",
(int) info->pw_uid, info->pw_name));
closelog ();
return -1;
}
return 0;
}
/*
* setup_uid_gid() performs the following steps -
*
* set the group ID to the value from the password file entry
* set the supplementary group IDs
* optionally call specified function which may add more groups
* set the user ID to the value from the password file entry
*
* Returns 0 on success, or -1 on failure.
*/
int setup_uid_gid (const struct passwd *info, int is_console)
{
if (setup_groups (info) < 0)
return -1;
#ifdef HAVE_INITGROUPS
if (is_console) {
char *cp = getdef_str ("CONSOLE_GROUPS");
if (cp && add_groups (cp))
perror ("Warning: add_groups");
}
#endif /* HAVE_INITGROUPS */
if (change_uid (info) < 0)
return -1;
return 0;
}