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setugid.c

/*
 * 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 6 2005-03-20 15:34:28Z bubulle $")

#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.
       */
#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;
}

/*
 *    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;
}

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