![Thomas De Schampheleire](/assets/img/avatar_default.png)
Since the addition of root password setting support in buildroot, there have been a few bug reports in this area ([1], [2]). In these cases, the system mkpasswd did either not work, or did not provide the options we expect, like -m <method>. This patch adds a mkpasswd host package, based on the sources from whois. When a non-empty root password is set, this package is used as a dependency. Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com> [1] http://lists.busybox.net/pipermail/buildroot/2013-July/075771.html [2] http://lists.busybox.net/pipermail/buildroot/2013-July/075869.html [Thomas P: use $(INSTALL) instead of install, put -lcrypt at the end of build command line to allow gcc to find the crypt() function in lcrypt.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
457 lines
12 KiB
C
457 lines
12 KiB
C
/*
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* Copyright (C) 2001-2008 Marco d'Itri
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* for crypt, snprintf and strcasecmp */
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#define _XOPEN_SOURCE
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#define _BSD_SOURCE
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/* System library */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#ifdef HAVE_GETOPT_LONG
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#include <getopt.h>
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#endif
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#include <fcntl.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#ifdef HAVE_XCRYPT
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#include <xcrypt.h>
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_LINUX_CRYPT_GENSALT
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#define _OW_SOURCE
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#include <crypt.h>
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#endif
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#ifdef HAVE_GETTIMEOFDAY
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#include <sys/time.h>
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#endif
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/* Application-specific */
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#include "utils.h"
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/* Global variables */
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#ifdef HAVE_GETOPT_LONG
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static const struct option longopts[] = {
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{"method", optional_argument, NULL, 'm'},
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/* for backward compatibility with versions < 4.7.25 (< 20080321): */
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{"hash", optional_argument, NULL, 'H'},
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{"help", no_argument, NULL, 'h'},
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{"password-fd", required_argument, NULL, 'P'},
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{"stdin", no_argument, NULL, 's'},
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{"salt", required_argument, NULL, 'S'},
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{"rounds", required_argument, NULL, 'R'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0 }
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};
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#else
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extern char *optarg;
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extern int optind;
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#endif
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static const char valid_salts[] = "abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./";
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struct crypt_method {
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const char *method; /* short name used by the command line option */
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const char *prefix; /* salt prefix */
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const unsigned int minlen; /* minimum salt length */
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const unsigned int maxlen; /* maximum salt length */
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const unsigned int rounds; /* supports a variable number of rounds */
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const char *desc; /* long description for the methods list */
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};
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static const struct crypt_method methods[] = {
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/* method prefix minlen, maxlen rounds description */
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{ "des", "", 2, 2, 0,
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N_("standard 56 bit DES-based crypt(3)") },
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{ "md5", "$1$", 8, 8, 0, "MD5" },
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#if defined OpenBSD || defined FreeBSD || (defined __SVR4 && defined __sun)
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{ "bf", "$2a$", 22, 22, 1, "Blowfish" },
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#endif
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#if defined HAVE_LINUX_CRYPT_GENSALT
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{ "bf", "$2a$", 22, 22, 1, "Blowfish, system-specific on 8-bit chars" },
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/* algorithm 2y fixes CVE-2011-2483 */
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{ "bfy", "$2y$", 22, 22, 1, "Blowfish, correct handling of 8-bit chars" },
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#endif
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#if defined FreeBSD
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{ "nt", "$3$", 0, 0, 0, "NT-Hash" },
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#endif
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#if defined HAVE_SHA_CRYPT
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/* http://people.redhat.com/drepper/SHA-crypt.txt */
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{ "sha-256", "$5$", 8, 16, 1, "SHA-256" },
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{ "sha-512", "$6$", 8, 16, 1, "SHA-512" },
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#endif
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/* http://www.crypticide.com/dropsafe/article/1389 */
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/*
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* Actually the maximum salt length is arbitrary, but Solaris by default
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* always uses 8 characters:
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* http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/ \
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* usr/src/lib/crypt_modules/sunmd5/sunmd5.c#crypt_gensalt_impl
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*/
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#if defined __SVR4 && defined __sun
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{ "sunmd5", "$md5$", 8, 8, 1, "SunMD5" },
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#endif
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{ NULL, NULL, 0, 0, 0, NULL }
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};
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void generate_salt(char *const buf, const unsigned int len);
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void *get_random_bytes(const int len);
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void display_help(int error);
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void display_version(void);
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void display_methods(void);
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int main(int argc, char *argv[])
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{
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int ch, i;
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int password_fd = -1;
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unsigned int salt_minlen = 0;
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unsigned int salt_maxlen = 0;
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unsigned int rounds_support = 0;
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const char *salt_prefix = NULL;
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const char *salt_arg = NULL;
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unsigned int rounds = 0;
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char *salt = NULL;
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char rounds_str[30];
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char *password = NULL;
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#ifdef ENABLE_NLS
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setlocale(LC_ALL, "");
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bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
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textdomain(NLS_CAT_NAME);
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#endif
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/* prepend options from environment */
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argv = merge_args(getenv("MKPASSWD_OPTIONS"), argv, &argc);
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while ((ch = GETOPT_LONGISH(argc, argv, "hH:m:5P:R:sS:V", longopts, 0))
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> 0) {
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switch (ch) {
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case '5':
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optarg = (char *) "md5";
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/* fall through */
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case 'm':
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case 'H':
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if (!optarg || strcaseeq("help", optarg)) {
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display_methods();
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exit(0);
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}
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for (i = 0; methods[i].method != NULL; i++)
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if (strcaseeq(methods[i].method, optarg)) {
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salt_prefix = methods[i].prefix;
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salt_minlen = methods[i].minlen;
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salt_maxlen = methods[i].maxlen;
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rounds_support = methods[i].rounds;
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break;
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}
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if (!salt_prefix) {
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fprintf(stderr, _("Invalid method '%s'.\n"), optarg);
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exit(1);
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}
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break;
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case 'P':
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{
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char *p;
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password_fd = strtol(optarg, &p, 10);
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if (p == NULL || *p != '\0' || password_fd < 0) {
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fprintf(stderr, _("Invalid number '%s'.\n"), optarg);
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exit(1);
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}
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}
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break;
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case 'R':
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{
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char *p;
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rounds = strtol(optarg, &p, 10);
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if (p == NULL || *p != '\0' || rounds < 0) {
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fprintf(stderr, _("Invalid number '%s'.\n"), optarg);
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exit(1);
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}
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}
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break;
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case 's':
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password_fd = 0;
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break;
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case 'S':
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salt_arg = optarg;
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break;
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case 'V':
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display_version();
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exit(0);
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case 'h':
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display_help(EXIT_SUCCESS);
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default:
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fprintf(stderr, _("Try '%s --help' for more information.\n"),
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argv[0]);
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exit(1);
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 2 && !salt_arg) {
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password = argv[0];
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salt_arg = argv[1];
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} else if (argc == 1) {
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password = argv[0];
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} else if (argc == 0) {
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} else {
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display_help(EXIT_FAILURE);
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}
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/* default: DES password */
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if (!salt_prefix) {
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salt_minlen = methods[0].minlen;
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salt_maxlen = methods[0].maxlen;
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salt_prefix = methods[0].prefix;
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}
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if (streq(salt_prefix, "$2a$") || streq(salt_prefix, "$2y$")) {
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/* OpenBSD Blowfish and derivatives */
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if (rounds <= 5)
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rounds = 5;
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/* actually for 2a/2y it is the logarithm of the number of rounds */
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snprintf(rounds_str, sizeof(rounds_str), "%02u$", rounds);
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} else if (rounds_support && rounds)
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snprintf(rounds_str, sizeof(rounds_str), "rounds=%u$", rounds);
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else
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rounds_str[0] = '\0';
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if (salt_arg) {
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unsigned int c = strlen(salt_arg);
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if (c < salt_minlen || c > salt_maxlen) {
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if (salt_minlen == salt_maxlen)
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fprintf(stderr, ngettext(
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"Wrong salt length: %d byte when %d expected.\n",
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"Wrong salt length: %d bytes when %d expected.\n", c),
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c, salt_maxlen);
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else
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fprintf(stderr, ngettext(
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"Wrong salt length: %d byte when %d <= n <= %d"
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" expected.\n",
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"Wrong salt length: %d bytes when %d <= n <= %d"
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" expected.\n", c),
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c, salt_minlen, salt_maxlen);
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exit(1);
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}
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while (c-- > 0) {
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if (strchr(valid_salts, salt_arg[c]) == NULL) {
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fprintf(stderr, _("Illegal salt character '%c'.\n"),
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salt_arg[c]);
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exit(1);
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}
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}
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salt = NOFAIL(malloc(strlen(salt_prefix) + strlen(rounds_str)
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+ strlen(salt_arg) + 1));
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*salt = '\0';
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strcat(salt, salt_prefix);
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strcat(salt, rounds_str);
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strcat(salt, salt_arg);
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} else {
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#ifdef HAVE_SOLARIS_CRYPT_GENSALT
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#error "This code path is untested on Solaris. Please send a patch."
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salt = crypt_gensalt(salt_prefix, NULL);
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if (!salt)
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perror(stderr, "crypt_gensalt");
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#elif defined HAVE_LINUX_CRYPT_GENSALT
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void *entropy = get_random_bytes(64);
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salt = crypt_gensalt(salt_prefix, rounds, entropy, 64);
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if (!salt) {
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fprintf(stderr, "crypt_gensalt failed.\n");
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exit(2);
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}
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free(entropy);
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#else
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unsigned int salt_len = salt_maxlen;
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if (salt_minlen != salt_maxlen) { /* salt length can vary */
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srand(time(NULL) + getpid());
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salt_len = rand() % (salt_maxlen - salt_minlen + 1) + salt_minlen;
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}
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salt = NOFAIL(malloc(strlen(salt_prefix) + strlen(rounds_str)
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+ salt_len + 1));
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*salt = '\0';
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strcat(salt, salt_prefix);
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strcat(salt, rounds_str);
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generate_salt(salt + strlen(salt), salt_len);
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#endif
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}
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if (password) {
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} else if (password_fd != -1) {
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FILE *fp;
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char *p;
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if (isatty(password_fd))
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fprintf(stderr, _("Password: "));
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password = NOFAIL(malloc(128));
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fp = fdopen(password_fd, "r");
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if (!fp) {
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perror("fdopen");
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exit(2);
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}
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if (!fgets(password, 128, fp)) {
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perror("fgets");
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exit(2);
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}
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p = strpbrk(password, "\n\r");
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if (p)
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*p = '\0';
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} else {
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password = getpass(_("Password: "));
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if (!password) {
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perror("getpass");
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exit(2);
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}
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}
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{
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const char *result;
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result = crypt(password, salt);
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/* xcrypt returns "*0" on errors */
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if (!result || result[0] == '*') {
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fprintf(stderr, "crypt failed.\n");
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exit(2);
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}
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/* yes, using strlen(salt_prefix) on salt. It's not
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* documented whether crypt_gensalt may change the prefix */
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if (!strneq(result, salt, strlen(salt_prefix))) {
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fprintf(stderr, _("Method not supported by crypt(3).\n"));
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exit(2);
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}
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printf("%s\n", result);
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}
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exit(0);
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}
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#ifdef RANDOM_DEVICE
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void* get_random_bytes(const int count)
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{
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char *buf;
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int fd;
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buf = NOFAIL(malloc(count));
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fd = open(RANDOM_DEVICE, O_RDONLY);
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if (fd < 0) {
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perror("open(" RANDOM_DEVICE ")");
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exit(2);
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}
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if (read(fd, buf, count) != count) {
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if (count < 0)
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perror("read(" RANDOM_DEVICE ")");
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else
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fprintf(stderr, "Short read of %s.\n", RANDOM_DEVICE);
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exit(2);
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}
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close(fd);
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return buf;
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}
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#endif
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#ifdef RANDOM_DEVICE
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void generate_salt(char *const buf, const unsigned int len)
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{
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unsigned int i;
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unsigned char *entropy = get_random_bytes(len * sizeof(unsigned char));
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for (i = 0; i < len; i++)
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buf[i] = valid_salts[entropy[i] % (sizeof valid_salts - 1)];
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buf[i] = '\0';
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}
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#else /* RANDOM_DEVICE */
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void generate_salt(char *const buf, const unsigned int len)
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{
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unsigned int i;
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# ifdef HAVE_GETTIMEOFDAY
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struct timeval tv;
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gettimeofday(&tv, NULL);
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srand(tv.tv_sec ^ tv.tv_usec);
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# else /* HAVE_GETTIMEOFDAY */
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# warning "This system lacks a strong enough random numbers generator!"
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/*
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* The possible values of time over one year are 31536000, which is
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* two orders of magnitude less than the allowed entropy range (2^32).
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*/
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srand(time(NULL) + getpid());
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# endif /* HAVE_GETTIMEOFDAY */
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for (i = 0; i < len; i++)
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buf[i] = valid_salts[rand() % (sizeof valid_salts - 1)];
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buf[i] = '\0';
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}
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#endif /* RANDOM_DEVICE */
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void display_help(int error)
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{
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fprintf((EXIT_SUCCESS == error) ? stdout : stderr,
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_("Usage: mkpasswd [OPTIONS]... [PASSWORD [SALT]]\n"
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"Crypts the PASSWORD using crypt(3).\n\n"));
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fprintf(stderr, _(
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" -m, --method=TYPE select method TYPE\n"
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" -5 like --method=md5\n"
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" -S, --salt=SALT use the specified SALT\n"
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" -R, --rounds=NUMBER use the specified NUMBER of rounds\n"
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" -P, --password-fd=NUM read the password from file descriptor NUM\n"
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" instead of /dev/tty\n"
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" -s, --stdin like --password-fd=0\n"
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" -h, --help display this help and exit\n"
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" -V, --version output version information and exit\n"
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"\n"
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"If PASSWORD is missing then it is asked interactively.\n"
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"If no SALT is specified, a random one is generated.\n"
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"If TYPE is 'help', available methods are printed.\n"
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"\n"
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"Report bugs to %s.\n"), "<md+whois@linux.it>");
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exit(error);
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}
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void display_version(void)
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{
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printf("mkpasswd %s\n\n", VERSION);
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puts("Copyright (C) 2001-2008 Marco d'Itri\n"
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"This is free software; see the source for copying conditions. There is NO\n"
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"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
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}
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void display_methods(void)
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{
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unsigned int i;
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printf(_("Available methods:\n"));
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for (i = 0; methods[i].method != NULL; i++)
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printf("%s\t%s\n", methods[i].method, methods[i].desc);
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}
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