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-rw-r--r--src/veritysetup/veritysetup.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c
new file mode 100644
index 0000000..ae497b0
--- /dev/null
+++ b/src/veritysetup/veritysetup.c
@@ -0,0 +1,243 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#include "alloc-util.h"
+#include "cryptsetup-util.h"
+#include "fileio.h"
+#include "hexdecoct.h"
+#include "log.h"
+#include "main-func.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "process-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+
+static uint32_t arg_activate_flags = CRYPT_ACTIVATE_READONLY;
+static char *arg_root_hash_signature = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_root_hash_signature, freep);
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-veritysetup@.service", "8", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH [OPTIONS]\n"
+ "%s detach VOLUME\n\n"
+ "Attach or detach a verity protected block device.\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int save_roothashsig_option(const char *option, bool strict) {
+ int r;
+
+ if (path_is_absolute(option) || startswith(option, "base64:")) {
+ if (!HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY)
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Activation of verity device with signature requested, but cryptsetup does not support crypt_activate_by_signed_key().");
+
+ r = free_and_strdup_warn(&arg_root_hash_signature, option);
+ if (r < 0)
+ return r;
+
+ return true;
+ }
+
+ if (!strict)
+ return false;
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "root-hash-signature= expects either full path to signature file or "
+ "base64 string encoding signature prefixed by base64:.");
+}
+
+static int parse_options(const char *options) {
+ int r;
+
+ /* backward compatibility with the obsolete ROOTHASHSIG positional argument */
+ r = save_roothashsig_option(options, /* strict= */ false);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ log_warning("Usage of ROOTHASHSIG positional argument is deprecated. "
+ "Please use the option root-hash-signature=%s instead.", options);
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ char *val;
+
+ r = extract_first_word(&options, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse options: %m");
+ if (r == 0)
+ break;
+
+ if (STR_IN_SET(word, "noauto", "auto", "nofail", "fail", "_netdev"))
+ continue;
+
+ if (isempty(word))
+ continue;
+ else if (streq(word, "ignore-corruption"))
+ arg_activate_flags |= CRYPT_ACTIVATE_IGNORE_CORRUPTION;
+ else if (streq(word, "restart-on-corruption"))
+ arg_activate_flags |= CRYPT_ACTIVATE_RESTART_ON_CORRUPTION;
+ else if (streq(word, "ignore-zero-blocks"))
+ arg_activate_flags |= CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS;
+#ifdef CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE
+ else if (streq(word, "check-at-most-once"))
+ arg_activate_flags |= CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE;
+#endif
+#ifdef CRYPT_ACTIVATE_PANIC_ON_CORRUPTION
+ else if (streq(word, "panic-on-corruption"))
+ arg_activate_flags |= CRYPT_ACTIVATE_PANIC_ON_CORRUPTION;
+#endif
+ else if ((val = startswith(word, "root-hash-signature="))) {
+ r = save_roothashsig_option(val, /* strict= */ true);
+ if (r < 0)
+ return r;
+
+ } else
+ log_warning("Encountered unknown option '%s', ignoring.", word);
+ }
+
+ return r;
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+ const char *verb;
+ int r;
+
+ if (argv_looks_like_help(argc, argv))
+ return help();
+
+ if (argc < 3)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires at least two arguments.");
+
+ log_setup();
+
+ cryptsetup_enable_logging(NULL);
+
+ umask(0022);
+
+ verb = argv[1];
+
+ if (streq(verb, "attach")) {
+ const char *volume, *data_device, *verity_device, *root_hash, *options;
+ _cleanup_free_ void *m = NULL;
+ crypt_status_info status;
+ size_t l;
+
+ if (argc < 6)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least four arguments.");
+
+ volume = argv[2];
+ data_device = argv[3];
+ verity_device = argv[4];
+ root_hash = argv[5];
+ options = mangle_none(argc > 6 ? argv[6] : NULL);
+
+ if (!filename_is_valid(volume))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
+
+ r = unhexmem(root_hash, SIZE_MAX, &m, &l);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse root hash: %m");
+
+ r = crypt_init(&cd, verity_device);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open verity device %s: %m", verity_device);
+
+ cryptsetup_enable_logging(cd);
+
+ status = crypt_status(cd, volume);
+ if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
+ log_info("Volume %s already active.", volume);
+ return 0;
+ }
+
+ if (options) {
+ r = parse_options(options);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse options: %m");
+ }
+
+ r = crypt_load(cd, CRYPT_VERITY, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to load verity superblock: %m");
+
+ r = crypt_set_data_device(cd, data_device);
+ if (r < 0)
+ return log_error_errno(r, "Failed to configure data device: %m");
+
+ if (arg_root_hash_signature) {
+#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
+ _cleanup_free_ char *hash_sig = NULL;
+ size_t hash_sig_size;
+ char *value;
+
+ if ((value = startswith(arg_root_hash_signature, "base64:"))) {
+ r = unbase64mem(value, strlen(value), (void *)&hash_sig, &hash_sig_size);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse root hash signature '%s': %m", arg_root_hash_signature);
+ } else {
+ r = read_full_file_full(
+ AT_FDCWD, arg_root_hash_signature, UINT64_MAX, SIZE_MAX,
+ READ_FULL_FILE_CONNECT_SOCKET,
+ NULL,
+ &hash_sig, &hash_sig_size);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read root hash signature: %m");
+ }
+
+ r = crypt_activate_by_signed_key(cd, volume, m, l, hash_sig, hash_sig_size, arg_activate_flags);
+#else
+ assert_not_reached();
+#endif
+ } else
+ r = crypt_activate_by_volume_key(cd, volume, m, l, arg_activate_flags);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set up verity device: %m");
+
+ } else if (streq(verb, "detach")) {
+ const char *volume;
+
+ volume = argv[2];
+
+ if (!filename_is_valid(volume))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
+
+ r = crypt_init_by_name(&cd, volume);
+ if (r == -ENODEV) {
+ log_info("Volume %s already inactive.", volume);
+ return 0;
+ }
+ if (r < 0)
+ return log_error_errno(r, "crypt_init_by_name() failed: %m");
+
+ cryptsetup_enable_logging(cd);
+
+ r = crypt_deactivate(cd, volume);
+ if (r < 0)
+ return log_error_errno(r, "Failed to deactivate: %m");
+
+ } else
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);