128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Separated from setup.c. --marekm
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID ("$Id: setugid.c,v 1.7 2003/04/22 10:59:22 kloczek Exp $")
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#include <stdio.h>
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#include <grp.h>
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#include "prototypes.h"
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#include "defines.h"
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#include <pwd.h>
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#include "getdef.h"
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/*
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* setup_uid_gid() split in two functions for PAM support -
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* pam_setcred() needs to be called after initgroups(), but
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* before setuid().
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*/
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int setup_groups (const struct passwd *info)
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{
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/*
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* Set the real group ID to the primary group ID in the password
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* file.
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*/
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if (setgid (info->pw_gid) == -1) {
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perror ("setgid");
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SYSLOG ((LOG_ERR, "bad group ID `%d' for user `%s': %m\n",
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info->pw_gid, info->pw_name));
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closelog ();
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return -1;
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}
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#ifdef HAVE_INITGROUPS
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/*
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* For systems which support multiple concurrent groups, go get
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* the group set from the /etc/group file.
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*/
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if (initgroups (info->pw_name, info->pw_gid) == -1) {
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perror ("initgroups");
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SYSLOG ((LOG_ERR, "initgroups failed for user `%s': %m\n",
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info->pw_name));
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closelog ();
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return -1;
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}
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#endif
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return 0;
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}
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int change_uid (const struct passwd *info)
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{
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/*
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* Set the real UID to the UID value in the password file.
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*/
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#ifndef BSD
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if (setuid (info->pw_uid))
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#else
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if (setreuid (info->pw_uid, info->pw_uid))
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#endif
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{
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perror ("setuid");
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SYSLOG ((LOG_ERR, "bad user ID `%d' for user `%s': %m\n",
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(int) info->pw_uid, info->pw_name));
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closelog ();
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return -1;
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}
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return 0;
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}
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/*
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* setup_uid_gid() performs the following steps -
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*
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* set the group ID to the value from the password file entry
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* set the supplementary group IDs
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* optionally call specified function which may add more groups
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* set the user ID to the value from the password file entry
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*
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* Returns 0 on success, or -1 on failure.
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*/
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int setup_uid_gid (const struct passwd *info, int is_console)
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{
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if (setup_groups (info) < 0)
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return -1;
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#ifdef HAVE_INITGROUPS
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if (is_console) {
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char *cp = getdef_str ("CONSOLE_GROUPS");
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if (cp && add_groups (cp))
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perror ("Warning: add_groups");
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}
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#endif /* HAVE_INITGROUPS */
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if (change_uid (info) < 0)
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return -1;
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return 0;
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}
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