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/**
* Copyright (C) 2007 International Business Machines
* Author(s): Michael Halcrow <mhalcrow@us.ibm.com>
* Dustin Kirkland <kirkland@canonical.com>
*
* 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.
*/
#include <stdio.h>
#include <ecryptfs.h>
#include <string.h>
#include "config.h"
void usage(void)
{
printf("Usage:\n"
"\n"
"ecryptfs-unwrap-passphrase [file]\n"
"or\n"
"printf \"%%s\" \"wrapping passphrase\" | "
"ecryptfs-unwrap-passphrase [file] -\n"
"\n");
}
int main(int argc, char *argv[])
{
char *file;
char passphrase[ECRYPTFS_MAX_PASSWORD_LENGTH + 1];
char *wrapping_passphrase;
char salt[ECRYPTFS_SALT_SIZE];
char salt_hex[ECRYPTFS_SALT_SIZE_HEX];
struct passwd *pwd;
int rc = 0;
if (argc == 1) {
/* interactive, and try default wrapped-passphrase file */
file = ecryptfs_get_wrapped_passphrase_filename();
if (file == NULL) {
usage();
goto out;
}
wrapping_passphrase = ecryptfs_get_passphrase("Passphrase");
} else if (argc == 2) {
/* interactive mode */
file = argv[1];
wrapping_passphrase = ecryptfs_get_passphrase("Passphrase");
} else if (argc == 3 &&
strlen(argv[2]) == 1 && strncmp(argv[2], "-", 1) == 0) {
/* stdin mode */
file = argv[1];
wrapping_passphrase = ecryptfs_get_passphrase(NULL);
} else if (argc == 3 &&
(strlen(argv[2]) != 1 || strncmp(argv[2], "-", 1) == 0)) {
/* argument mode */
file = argv[1];
wrapping_passphrase = argv[2];
} else {
usage();
goto out;
}
if (wrapping_passphrase == NULL ||
strlen(wrapping_passphrase) > ECRYPTFS_MAX_PASSWORD_LENGTH) {
usage();
goto out;
}
rc = ecryptfs_read_salt_hex_from_rc(salt_hex);
if (rc) {
from_hex(salt, ECRYPTFS_DEFAULT_SALT_HEX, ECRYPTFS_SALT_SIZE);
} else
from_hex(salt, salt_hex, ECRYPTFS_SALT_SIZE);
if ((rc = ecryptfs_unwrap_passphrase(passphrase, file,
wrapping_passphrase, salt))) {
fprintf(stderr, "%s [%d]\n", ECRYPTFS_ERROR_UNWRAP, rc);
fprintf(stderr, "%s\n", ECRYPTFS_INFO_CHECK_LOG);
rc = 1;
goto out;
}
printf("%s\n", passphrase);
out:
return rc;
}
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