155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <libcryptsetup.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include "log.h"
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#include "hexdecoct.h"
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#include "string-util.h"
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#include "alloc-util.h"
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static char *arg_root_hash = NULL;
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static char *arg_data_what = NULL;
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static char *arg_hash_what = NULL;
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static int help(void) {
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printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH\n"
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"%s detach VOLUME\n\n"
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"Attaches or detaches an integrity protected block device.\n",
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program_invocation_short_name,
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program_invocation_short_name);
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return 0;
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}
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static void log_glue(int level, const char *msg, void *usrptr) {
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log_debug("%s", msg);
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}
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int main(int argc, char *argv[]) {
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struct crypt_device *cd = NULL;
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int r;
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if (argc <= 1) {
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r = help();
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goto finish;
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}
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if (argc < 3) {
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log_error("This program requires at least two arguments.");
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r = -EINVAL;
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goto finish;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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if (streq(argv[1], "attach")) {
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_cleanup_free_ void *m = NULL;
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crypt_status_info status;
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size_t l;
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if (argc < 6) {
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log_error("attach requires at least two arguments.");
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r = -EINVAL;
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goto finish;
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}
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r = unhexmem(argv[5], strlen(argv[5]), &m, &l);
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if (r < 0) {
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log_error("Failed to parse root hash.");
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goto finish;
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}
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r = crypt_init(&cd, argv[4]);
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if (r < 0) {
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log_error_errno(r, "Failed to open verity device %s: %m", argv[4]);
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goto finish;
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}
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crypt_set_log_callback(cd, log_glue, NULL);
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status = crypt_status(cd, argv[2]);
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if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
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log_info("Volume %s already active.", argv[2]);
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r = 0;
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goto finish;
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}
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r = crypt_load(cd, CRYPT_VERITY, NULL);
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if (r < 0) {
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log_error_errno(r, "Failed to load verity superblock: %m");
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goto finish;
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}
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r = crypt_set_data_device(cd, argv[3]);
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if (r < 0) {
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log_error_errno(r, "Failed to configure data device: %m");
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goto finish;
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}
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r = crypt_activate_by_volume_key(cd, argv[2], m, l, CRYPT_ACTIVATE_READONLY);
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if (r < 0) {
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log_error_errno(r, "Failed to set up verity device: %m");
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goto finish;
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}
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} else if (streq(argv[1], "detach")) {
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r = crypt_init_by_name(&cd, argv[2]);
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if (r == -ENODEV) {
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log_info("Volume %s already inactive.", argv[2]);
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goto finish;
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} else if (r < 0) {
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log_error_errno(r, "crypt_init_by_name() failed: %m");
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goto finish;
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}
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crypt_set_log_callback(cd, log_glue, NULL);
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r = crypt_deactivate(cd, argv[2]);
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if (r < 0) {
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log_error_errno(r, "Failed to deactivate: %m");
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goto finish;
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}
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} else {
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log_error("Unknown verb %s.", argv[1]);
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r = -EINVAL;
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goto finish;
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}
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r = 0;
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finish:
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if (cd)
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crypt_free(cd);
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free(arg_root_hash);
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free(arg_data_what);
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free(arg_hash_what);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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