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