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/* Copyright (c) 2005-2010, Michael Santos <michael.santos@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the author 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 THE COPYRIGHT HOLDERS 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 THE
* COPYRIGHT HOLDER 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.
*/
/*
* rst: TCP connect reset utility
*
* Aggressively resets TCP connections using TCP RST's or
* ICMP.
*
*/
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include "rst.h"
int
rst_priv_drop(char *user, char *group, char *path)
{
uid_t uid = 0;
gid_t gid = 0;
struct passwd *pwd = NULL;
struct group *gr = NULL;
if ( (user == NULL) || (group == NULL))
return (-1);
if ( (pwd = getpwnam(user)) == NULL) {
warnx("user does not exist: %s", user);
return (-1);
}
uid = pwd->pw_uid;
if ( (gr = getgrnam(group)) == NULL) {
warnx("group does not exist: %s", group);
return (-1);
}
gid = gr->gr_gid;
/* Disallow running as root */
if (uid == 0) {
warnx("refusing to running as root");
return (-1);
}
if (chroot(path) != 0) {
warnx("could not chroot: %s", RST_DIR);
return (-1);
}
if (chdir("/") != 0) {
warn("could not change to / in chroot");
return (-1);
}
if (setgid(gid) != 0) {
warnx("could not drop group privs");
return (-1);
}
if (setuid(uid) != 0) {
warnx("could not drop user privs");
return (-1);
}
return (0);
}
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