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/**
* Copyright (C) 2007 International Business Machines
* Author(s): Michael Halcrow <mhalcrow@us.ibm.com>
* Dustin Kirkland <kirkland@ubuntu.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>
void usage(void)
{
printf("Usage:\n"
"\n"
"ecryptfs-rewrap-passphrase [file]\n"
"or\n"
"printf \"%%s\\n%%s\" \"old wrapping passphrase\" "
"\"new wrapping passphrase\" "
"| ecryptfs-rewrap-passphrase [file] -\n"
"\n");
}
int main(int argc, char *argv[])
{
char *file;
char passphrase[ECRYPTFS_MAX_PASSWORD_LENGTH + 1];
char *old_wrapping_passphrase;
char *new_wrapping_passphrase;
char salt[ECRYPTFS_SALT_SIZE];
char salt_hex[ECRYPTFS_SALT_SIZE_HEX];
int rc = 0;
if (argc == 2) {
char *new_wrapping_passphrase2;
/* interactive mode */
old_wrapping_passphrase =
ecryptfs_get_passphrase("Old wrapping passphrase");
new_wrapping_passphrase =
ecryptfs_get_passphrase("New wrapping passphrase");
new_wrapping_passphrase2 =
ecryptfs_get_passphrase("New wrapping passphrase (again)");
if (!new_wrapping_passphrase) {
fprintf(stderr, "Failed to read new wrapping passphrase\n");
rc = 1;
goto out;
} else if (!new_wrapping_passphrase2) {
fprintf(stderr, "Failed to read new wrapping passphrase confirmation\n");
rc = 1;
goto out;
} else if (strcmp(new_wrapping_passphrase,
new_wrapping_passphrase2)) {
fprintf(stderr, "New wrapping passphrases do not match\n");
rc = 1;
goto out;
}
} else if (argc == 3
&& strlen(argv[2]) == 1 && strncmp(argv[2], "-", 1) == 0) {
/* stdin mode */
old_wrapping_passphrase = ecryptfs_get_passphrase(NULL);
new_wrapping_passphrase = ecryptfs_get_passphrase(NULL);
} else if (argc == 4) {
/* argument mode */
old_wrapping_passphrase = argv[2];
new_wrapping_passphrase = argv[3];
} else {
usage();
goto out;
}
if (!old_wrapping_passphrase || !new_wrapping_passphrase ||
strlen(old_wrapping_passphrase) > ECRYPTFS_MAX_PASSWORD_LENGTH ||
strlen(new_wrapping_passphrase) > ECRYPTFS_MAX_PASSWORD_LENGTH) {
usage();
goto out;
}
file = argv[1];
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,
old_wrapping_passphrase, salt))) {
fprintf(stderr, "%s [%d]\n", ECRYPTFS_ERROR_UNWRAP, rc);
fprintf(stderr, "%s\n", ECRYPTFS_INFO_CHECK_LOG);
rc = 1;
goto out;
}
if ((rc = ecryptfs_wrap_passphrase(file, new_wrapping_passphrase, salt,
passphrase))) {
fprintf(stderr, "%s [%d]\n", ECRYPTFS_ERROR_WRAP, rc);
fprintf(stderr, "%s\n", ECRYPTFS_INFO_CHECK_LOG);
rc = 1;
goto out;
}
out:
return rc;
}
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