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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <errno.h>
#include <libcryptsetup.h>
#include "log.h"
#include "util.h"
#include "ask-password-api.h"
static unsigned opt_tries = 0;
static char *opt_cipher = NULL;
static unsigned opt_size = 0;
static char *opt_hash = NULL;
static bool opt_readonly = false;
static bool opt_verify = false;
static usec_t arg_timeout = 0;
static int parse_one_option(const char *option) {
assert(option);
/* Handled outside of this tool */
if (streq(option, "swap") ||
streq(option, "tmp") ||
streq(option, "noauto"))
return 0;
if (startswith(option, "cipher=")) {
char *t;
if (!(t = strdup(option+7)))
return -ENOMEM;
free(opt_cipher);
opt_cipher = t;
} else if (startswith(option, "size=")) {
if (safe_atou(option+5, &opt_size) < 0) {
log_error("size= parse failure, ignoring.");
return 0;
}
} else if (startswith(option, "hash=")) {
char *t;
if (!(t = strdup(option+5)))
return -ENOMEM;
free(opt_hash);
opt_hash = t;
} else if (startswith(option, "tries=")) {
if (safe_atou(option+6, &opt_tries) < 0) {
log_error("tries= parse failure, ignoring.");
return 0;
}
} else if (streq(option, "readonly"))
opt_readonly = true;
else if (streq(option, "verify"))
opt_verify = true;
else if (startswith(option, "timeout=")) {
if (parse_usec(option+8, &arg_timeout) < 0) {
log_error("timeout= parse failure, ignoring.");
return 0;
}
} else
log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
return 0;
}
static int parse_options(const char *options) {
char *state;
char *w;
size_t l;
assert(options);
FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
char *o;
int r;
if (!(o = strndup(w, l)))
return -ENOMEM;
r = parse_one_option(o);
free(o);
if (r < 0)
return r;
}
return 0;
}
static void log_glue(int level, const char *msg, void *usrptr) {
log_full(level == CRYPT_LOG_ERROR ? LOG_ERR :
level == CRYPT_LOG_VERBOSE ? LOG_INFO :
level == CRYPT_LOG_DEBUG ? LOG_DEBUG :
LOG_NOTICE,
"%s", msg);
}
static int password_glue(const char *msg, char *buf, size_t length, void *usrptr) {
usec_t until;
char *password = NULL;
int k;
until = now(CLOCK_MONOTONIC) + (arg_timeout > 0 ? arg_timeout : 60 * USEC_PER_SEC);
if ((k = ask_password_agent(msg, "drive-harddisk", until, &password)) < 0)
return k;
strncpy(buf, password, length-1);
buf[length-1] = 0;
free(password);
return strlen(buf);
}
int main(int argc, char *argv[]) {
int r = EXIT_FAILURE;
struct crypt_device *cd = NULL;
if (argc < 3) {
log_error("This program requires at least two arguments.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
log_parse_environment();
log_open();
if (streq(argv[1], "attach") ||
streq(argv[1], "format-and-attach")) {
uint32_t flags = 0;
int k;
const char *key_file = NULL;
if (argc < 4) {
log_error("attach requires at least two arguments.");
goto finish;
}
if (argc >= 5 && argv[4][0] && !streq(argv[4], "-")) {
if (!path_is_absolute(argv[4]))
log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
else
key_file = argv[4];
}
if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
parse_options(argv[5]);
if ((k = crypt_init(&cd, argv[3]))) {
log_error("crypt_init() failed: %s", strerror(-k));
goto finish;
}
crypt_set_log_callback(cd, log_glue, NULL);
crypt_set_password_callback(cd, password_glue, NULL);
if (streq(argv[1], "format-and-attach")) {
/* Format with random key and attach */
log_error("Formatting not yet supported.");
goto finish;
} else if ((k = crypt_load(cd, CRYPT_LUKS1, NULL))) {
log_error("crypt_load() failed: %s", strerror(-k));
goto finish;
}
if (opt_readonly)
flags |= CRYPT_ACTIVATE_READONLY;
if (key_file) {
crypt_set_password_retry(cd, 1);
k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, 0, flags);
} else {
crypt_set_password_retry(cd, opt_tries > 0 ? opt_tries : 3);
k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, NULL, 0, flags);
}
if (k < 0) {
log_error("Failed to activate: %s", strerror(-k));
goto finish;
}
} else if (streq(argv[1], "detach")) {
int k;
if ((k = crypt_init_by_name(&cd, argv[2]))) {
log_error("crypt_init() failed: %s", strerror(-k));
goto finish;
}
crypt_set_log_callback(cd, log_glue, NULL);
if ((k = crypt_deactivate(cd, argv[2])) < 0) {
log_error("Failed to deactivate: %s", strerror(-k));
goto finish;
}
} else {
log_error("Unknown verb %s.", argv[1]);
goto finish;
}
r = EXIT_SUCCESS;
finish:
if (cd)
crypt_free(cd);
return r;
}
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