132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*
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* Copyright (c) 2011 , Julian Pidancet
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* Copyright (c) 2011 , Nicolas François
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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. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <assert.h>
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#include "defines.h"
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#include "prototypes.h"
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/*@-exitarg@*/
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#include "exitcodes.h"
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#include "shadowlog.h"
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static void change_root (const char* newroot);
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/*
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* process_root_flag - chroot if given the --root option
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*
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* This shall be called before accessing the passwd, group, shadow,
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* gshadow, useradd's default, login.defs files (non exhaustive list)
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* or authenticating the caller.
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*
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* The audit, syslog, or locale files shall be open before
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*/
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extern void process_root_flag (const char* short_opt, int argc, char **argv)
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{
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/*
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* Parse the command line options.
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*/
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int i;
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const char *newroot = NULL, *val;
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for (i = 0; i < argc; i++) {
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val = NULL;
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if ( (strcmp (argv[i], "--root") == 0)
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|| ((strncmp (argv[i], "--root=", 7) == 0)
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&& (val = argv[i] + 7))
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|| (strcmp (argv[i], short_opt) == 0)) {
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if (NULL != newroot) {
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fprintf (log_get_logfd(),
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_("%s: multiple --root options\n"),
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log_get_progname());
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exit (E_BAD_ARG);
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}
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if (val) {
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newroot = val;
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} else if (i + 1 == argc) {
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fprintf (log_get_logfd(),
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_("%s: option '%s' requires an argument\n"),
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log_get_progname(), argv[i]);
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exit (E_BAD_ARG);
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} else {
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newroot = argv[++ i];
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}
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}
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}
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if (NULL != newroot) {
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change_root (newroot);
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}
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}
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static void change_root (const char* newroot)
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{
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/* Drop privileges */
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if ( (setregid (getgid (), getgid ()) != 0)
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|| (setreuid (getuid (), getuid ()) != 0)) {
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fprintf (log_get_logfd(), _("%s: failed to drop privileges (%s)\n"),
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log_get_progname(), strerror (errno));
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exit (EXIT_FAILURE);
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}
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if ('/' != newroot[0]) {
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fprintf (log_get_logfd(),
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_("%s: invalid chroot path '%s'\n"),
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log_get_progname(), newroot);
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exit (E_BAD_ARG);
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}
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if (access (newroot, F_OK) != 0) {
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fprintf(log_get_logfd(),
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_("%s: cannot access chroot directory %s: %s\n"),
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log_get_progname(), newroot, strerror (errno));
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exit (E_BAD_ARG);
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}
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if (chdir (newroot) != 0) {
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fprintf(log_get_logfd(),
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_("%s: cannot chdir to chroot directory %s: %s\n"),
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log_get_progname(), newroot, strerror (errno));
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exit (E_BAD_ARG);
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}
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if (chroot (newroot) != 0) {
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fprintf(log_get_logfd(),
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_("%s: unable to chroot to directory %s: %s\n"),
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log_get_progname(), newroot, strerror (errno));
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exit (E_BAD_ARG);
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}
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}
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