76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/*-
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* Copyright (C) 2005 Diomidis Spinellis. 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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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/syslog.h>
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#include "portald.h"
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/*
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* Set the process's credentials to those specified in user,
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* saving the existing ones in save.
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* Return 0 on success, -1 (with errno set) on error.
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*/
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int
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set_user_credentials(struct portal_cred *user, struct portal_cred *save)
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{
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save->pcr_uid = geteuid();
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if ((save->pcr_ngroups = getgroups(NGROUPS_MAX, save->pcr_groups)) < 0)
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return (-1);
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if (setgroups(user->pcr_ngroups, user->pcr_groups) < 0)
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return (-1);
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if (seteuid(user->pcr_uid) < 0)
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return (-1);
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return (0);
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}
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/*
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* Restore the process's credentials to the ones specified in save.
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* Log failures using LOG_ERR.
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* Return 0 on success, -1 (with errno set) on error.
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*/
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int
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restore_credentials(struct portal_cred *save)
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{
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if (seteuid(save->pcr_uid) < 0) {
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syslog(LOG_ERR, "seteuid: %m");
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return (-1);
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}
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if (setgroups(save->pcr_ngroups, save->pcr_groups) < 0) {
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syslog(LOG_ERR, "setgroups: %m");
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return (-1);
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}
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return (0);
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}
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