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/**
* test.c: Verify the migration from version 1 to version 2 wrapped-passphrase
* files
* Author: Tyler Hicks <tyhicks@canonical.com>
*
* Copyright (C) 2015 Canonical, Ltd.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "../../src/include/ecryptfs.h"
#define ECRYPTFS_MAX_KEY_HEX_BYTES (ECRYPTFS_MAX_KEY_BYTES * 2)
#define NEW_WRAPPING_PASSPHRASE "The *new* eCryptfs wrapping passphrase."
static void usage(const char *name)
{
fprintf(stderr,
"%s FILENAME EXPECTED_PASS WRAPPING_PASS WRAPPING_SALT_HEX\n",
name);
}
/**
* Returns 0 if the unwrap operation resulted in the expected decrypted
* passphrase
*/
static int verify_unwrap(char *expected_decrypted_passphrase, char *filename,
char *wrapping_passphrase, char *wrapping_salt)
{
char decrypted_passphrase[ECRYPTFS_MAX_PASSPHRASE_BYTES + 1];
int rc;
memset(decrypted_passphrase, 0, sizeof(decrypted_passphrase));
rc = ecryptfs_unwrap_passphrase(decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
if (rc)
return 1;
if (strcmp(decrypted_passphrase, expected_decrypted_passphrase))
return 1;
return 0;
}
/**
* Returns 0 if the *invalid* unwrap operations always fail
*/
static int verify_bad_unwrap(char *expected_decrypted_passphrase, char *filename,
char *wrapping_passphrase, char *wrapping_salt)
{
char *last;
int rc;
/* Increment first char in the wrapping_passphrase and verify that the
* unwrapping operation fails */
wrapping_passphrase[0]++;
rc = verify_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
wrapping_passphrase[0]--;
if (!rc)
return 1;
/* Increment last char in the wrapping_passphrase and verify that the
* unwrapping operation fails */
last = wrapping_passphrase + (strlen(wrapping_passphrase) - 1);
(*last)++;
rc = verify_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
(*last)--;
if (!rc)
return 1;
/* Perform a one's complement on the first char in the salt and verify
* that the unwrapping operation fails */
wrapping_salt[0] = ~wrapping_salt[0];
rc = verify_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
wrapping_salt[0] = ~wrapping_salt[0];
if (!rc)
return 1;
/* Perform a one's complement on the last char in the salt and verify
* that the unwrapping operation fails */
last = wrapping_salt + (ECRYPTFS_SALT_SIZE - 1);
*last = ~(*last);
rc = verify_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
*last = ~(*last);
if (!rc)
return 1;
return 0;
}
static int do_rewrap(char *filename, char *old_wrapping_passphrase,
char *old_wrapping_salt, char *new_wrapping_passphrase)
{
char decrypted_passphrase[ECRYPTFS_MAX_PASSPHRASE_BYTES + 1];
uint8_t version = 0;
int rc;
memset(decrypted_passphrase, 0, sizeof(decrypted_passphrase));
rc = ecryptfs_unwrap_passphrase(decrypted_passphrase, filename,
old_wrapping_passphrase,
old_wrapping_salt);
if (rc)
return 1;
rc = ecryptfs_wrap_passphrase(filename, new_wrapping_passphrase, NULL,
decrypted_passphrase);
if (rc)
return 1;
rc = __ecryptfs_detect_wrapped_passphrase_file_version(filename,
&version);
if (version != 2)
return 1;
return 0;
}
int main(int argc, char *argv[])
{
char wrapping_salt[ECRYPTFS_SALT_SIZE];
char *expected_decrypted_passphrase, *filename, *wrapping_passphrase,
*wrapping_salt_hex;
int rc;
if (argc != 5) {
usage(argv[0]);
return EINVAL;
}
filename = argv[1];
expected_decrypted_passphrase = argv[2];
wrapping_passphrase = argv[3];
wrapping_salt_hex = argv[4];
if (strlen(expected_decrypted_passphrase) > ECRYPTFS_MAX_PASSPHRASE_BYTES ||
strlen(wrapping_passphrase) > ECRYPTFS_MAX_PASSPHRASE_BYTES ||
strlen(wrapping_salt_hex) != ECRYPTFS_SALT_SIZE_HEX) {
usage(argv[0]);
return EINVAL;
}
from_hex(wrapping_salt, wrapping_salt_hex, ECRYPTFS_SALT_SIZE);
rc = verify_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
if (rc)
return 1;
rc = verify_bad_unwrap(expected_decrypted_passphrase, filename,
wrapping_passphrase, wrapping_salt);
if (rc)
return 2;
rc = do_rewrap(filename, wrapping_passphrase, wrapping_salt,
NEW_WRAPPING_PASSPHRASE);
if (rc)
return 3;
rc = verify_unwrap(expected_decrypted_passphrase, filename,
NEW_WRAPPING_PASSPHRASE, NULL);
if (rc)
return 4;
return 0;
}
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