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114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2011 , Julian Pidancet
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* SPDX-FileCopyrightText: 2011 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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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 "defines.h"
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/*@-exitarg@*/
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#include "exitcodes.h"
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#include "prototypes.h"
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#include "shadowlog.h"
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#include "string/strcmp/streq.h"
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#include "string/strcmp/strprefix.h"
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#include "string/strerrno.h"
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#include <assert.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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const char *newroot = NULL;
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for (int i = 0; i < argc; i++) {
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const char *val;
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val = strprefix(argv[i], "--root=");
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if ( streq(argv[i], "--root")
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|| val != NULL
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|| streq(argv[i], short_opt))
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{
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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(), strerrno());
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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', only absolute paths are supported.\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, strerrno());
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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, strerrno());
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exit (E_BAD_ARG);
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}
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if (chdir ("/") != 0) {
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fprintf(log_get_logfd(),
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_("%s: cannot chdir in chroot directory %s: %s\n"),
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log_get_progname(), newroot, strerrno());
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exit (E_BAD_ARG);
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}
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}
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