grub/util/grub-mkpasswd-pbkdf2.c
Colin Watson db8fa1ad87 * util/grub-mkpasswd-pbkdf2.c (main): Rename top-level `c' variable
to `count', fixing variable shadowing that broke the -c option.
2010-06-07 14:15:57 +01:00

342 lines
7.1 KiB
C

/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1992-1999,2001,2003,2004,2005,2009 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/crypto.h>
#include <grub/util/misc.h>
#include <grub/i18n.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <termios.h>
#include "progname.h"
/* Few functions to make crypto happy. */
void *
grub_memmove (void *dest, const void *src, grub_size_t n)
{
return memmove (dest, src, n);
}
void *
grub_memset (void *s, int c, grub_size_t n)
{
return memset (s, c, n);
}
int
grub_vprintf (const char *fmt, va_list args)
{
return vprintf (fmt, args);
}
int
grub_vsnprintf (char *str, grub_size_t n, const char *fmt, va_list args)
{
return vsnprintf (str, n, fmt, args);
}
void
grub_abort (void)
{
abort ();
}
static struct option options[] =
{
{"iteration_count", required_argument, 0, 'c'},
{"buflen", required_argument, 0, 'l'},
{"saltlen", required_argument, 0, 's'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
};
static void
usage (int status)
{
if (status)
fprintf (stderr, "Try `%s --help' for more information.\n", program_name);
else
printf ("\
Usage: %s [OPTIONS]\n\
\nOptions:\n\
-c number, --iteration-count=number Number of PBKDF2 iterations\n\
-l number, --buflen=number Length of generated hash\n\
-s number, --salt=number Length of salt\n\
\n\
Report bugs to <%s>.\n", program_name, PACKAGE_BUGREPORT);
exit (status);
}
static void
hexify (char *hex, grub_uint8_t *bin, grub_size_t n)
{
while (n--)
{
if (((*bin & 0xf0) >> 4) < 10)
*hex = ((*bin & 0xf0) >> 4) + '0';
else
*hex = ((*bin & 0xf0) >> 4) + 'A' - 10;
hex++;
if ((*bin & 0xf) < 10)
*hex = (*bin & 0xf) + '0';
else
*hex = (*bin & 0xf) + 'A' - 10;
hex++;
bin++;
}
*hex = 0;
}
int
main (int argc, char *argv[])
{
unsigned int count = 10000, buflen = 64, saltlen = 64;
char *pass1, *pass2;
char *bufhex, *salthex;
gcry_err_code_t gcry_err;
grub_uint8_t *buf, *salt;
ssize_t nr;
FILE *in, *out;
struct termios s, t;
int tty_changed;
set_program_name (argv[0]);
grub_util_init_nls ();
/* Check for options. */
while (1)
{
int c = getopt_long (argc, argv, "c:l:s:hvV", options, 0);
if (c == -1)
break;
switch (c)
{
case 'c':
count = strtoul (optarg, NULL, 0);
break;
case 'l':
buflen = strtoul (optarg, NULL, 0);
break;
case 's':
saltlen = strtoul (optarg, NULL, 0);
break;
case 'h':
usage (0);
return 0;
case 'V':
printf ("%s (%s) %s\n", program_name,
PACKAGE_NAME, PACKAGE_VERSION);
return 0;
default:
usage (1);
return 1;
}
}
bufhex = malloc (buflen * 2 + 1);
if (!bufhex)
grub_util_error ("out of memory");
buf = malloc (buflen);
if (!buf)
{
free (bufhex);
grub_util_error ("out of memory");
}
salt = malloc (saltlen);
if (!salt)
{
free (bufhex);
free (buf);
grub_util_error ("out of memory");
}
salthex = malloc (saltlen * 2 + 1);
if (!salthex)
{
free (salt);
free (bufhex);
free (buf);
grub_util_error ("out of memory");
}
/* Disable echoing. Based on glibc. */
in = fopen ("/dev/tty", "w+c");
if (in == NULL)
{
in = stdin;
out = stderr;
}
else
out = in;
if (tcgetattr (fileno (in), &t) == 0)
{
/* Save the old one. */
s = t;
/* Tricky, tricky. */
t.c_lflag &= ~(ECHO|ISIG);
tty_changed = (tcsetattr (fileno (in), TCSAFLUSH, &t) == 0);
}
else
tty_changed = 0;
printf ("Enter password: ");
pass1 = NULL;
{
grub_size_t n;
nr = getline (&pass1, &n, stdin);
}
if (nr < 0 || !pass1)
{
free (buf);
free (bufhex);
free (salthex);
free (salt);
/* Restore the original setting. */
if (tty_changed)
(void) tcsetattr (fileno (in), TCSAFLUSH, &s);
grub_util_error ("failure to read password");
}
if (nr >= 1 && pass1[nr-1] == '\n')
pass1[nr-1] = 0;
printf ("\nReenter password: ");
pass2 = NULL;
{
grub_size_t n;
nr = getline (&pass2, &n, stdin);
}
/* Restore the original setting. */
if (tty_changed)
(void) tcsetattr (fileno (in), TCSAFLUSH, &s);
printf ("\n");
if (nr < 0 || !pass2)
{
memset (pass1, 0, strlen (pass1));
free (pass1);
free (buf);
free (bufhex);
free (salthex);
free (salt);
grub_util_error ("failure to read password");
}
if (nr >= 1 && pass2[nr-1] == '\n')
pass2[nr-1] = 0;
if (strcmp (pass1, pass2) != 0)
{
memset (pass1, 0, strlen (pass1));
memset (pass2, 0, strlen (pass2));
free (pass1);
free (pass2);
free (buf);
free (bufhex);
free (salthex);
free (salt);
grub_util_error ("passwords don't match");
}
memset (pass2, 0, strlen (pass2));
free (pass2);
#if ! defined (__linux__) && ! defined (__FreeBSD__)
printf ("WARNING: your random generator isn't known to be secure\n");
#endif
{
FILE *f;
size_t rd;
f = fopen ("/dev/random", "rb");
if (!f)
{
memset (pass1, 0, strlen (pass1));
free (pass1);
free (buf);
free (bufhex);
free (salthex);
free (salt);
fclose (f);
grub_util_error ("couldn't retrieve random data for salt");
}
rd = fread (salt, 1, saltlen, f);
if (rd != saltlen)
{
fclose (f);
memset (pass1, 0, strlen (pass1));
free (pass1);
free (buf);
free (bufhex);
free (salthex);
free (salt);
fclose (f);
grub_util_error ("couldn't retrieve random data for salt");
}
fclose (f);
}
gcry_err = grub_crypto_pbkdf2 (GRUB_MD_SHA512,
(grub_uint8_t *) pass1, strlen (pass1),
salt, saltlen,
count, buf, buflen);
memset (pass1, 0, strlen (pass1));
free (pass1);
if (gcry_err)
{
memset (buf, 0, buflen);
memset (bufhex, 0, 2 * buflen);
free (buf);
free (bufhex);
memset (salt, 0, saltlen);
memset (salthex, 0, 2 * saltlen);
free (salt);
free (salthex);
grub_util_error ("cryptographic error number %d", gcry_err);
}
hexify (bufhex, buf, buflen);
hexify (salthex, salt, saltlen);
printf ("Your PBKDF2 is grub.pbkdf2.sha512.%d.%s.%s\n",
count, salthex, bufhex);
memset (buf, 0, buflen);
memset (bufhex, 0, 2 * buflen);
free (buf);
free (bufhex);
memset (salt, 0, saltlen);
memset (salthex, 0, 2 * saltlen);
free (salt);
free (salthex);
return 0;
}