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deb-mbse/unix/setugid.c

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/*****************************************************************************
*
* $Id$
* Purpose ...............: MBSE BBS Shadow Password Suite
* Original Source .......: Shadow Password Suite
* Original Copyright ....: Julianne Frances Haugh and others.
*
*****************************************************************************
* Copyright (C) 1997-2001
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*****************************************************************************/
/*
* Separated from setup.c. --marekm
*/
#include "../config.h"
#include <stdio.h>
#include <syslog.h>
#include "mblogin.h"
#include <pwd.h>
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#include <grp.h>
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#include "getdef.h"
#include "setugid.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;
}
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int change_uid(const struct passwd *info)
{
/*
* Set the real UID to the UID value in the password file.
*/
#ifndef BSD
if (setuid(info->pw_uid))
#else
if (setreuid(info->pw_uid, info->pw_uid))
#endif
{
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;
}
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/*
* setup_uid_gid() performs the following steps -
*
* set the group ID to the value from the password file entry
* set the supplementary group IDs
*
* 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;
if (change_uid(info) < 0)
return -1;
return 0;
}