diff options
Diffstat (limited to 'src/veritysetup/veritysetup.c')
| -rw-r--r-- | src/veritysetup/veritysetup.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c new file mode 100644 index 0000000..558e951 --- /dev/null +++ b/src/veritysetup/veritysetup.c @@ -0,0 +1,139 @@ +/* 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 "string-util.h" +#include "terminal-util.h" + +static char *arg_root_hash = NULL; +static char *arg_data_what = NULL; +static char *arg_hash_what = NULL; + +STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep); +STATIC_DESTRUCTOR_REGISTER(arg_data_what, freep); +STATIC_DESTRUCTOR_REGISTER(arg_hash_what, 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 [ROOTHASHSIG]\n" + "%s detach VOLUME\n\n" + "Attaches or detaches an integrity protected block device.\n" + "\nSee the %s for details.\n" + , program_invocation_short_name + , program_invocation_short_name + , link + ); + + return 0; +} + +static int run(int argc, char *argv[]) { + _cleanup_(crypt_freep) struct crypt_device *cd = NULL; + int r; + + if (argc <= 1) + return help(); + + if (argc < 3) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires at least two arguments."); + + log_setup_service(); + + umask(0022); + + if (streq(argv[1], "attach")) { + _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 two arguments."); + + r = unhexmem(argv[5], strlen(argv[5]), &m, &l); + if (r < 0) + return log_error_errno(r, "Failed to parse root hash: %m"); + + r = crypt_init(&cd, argv[4]); + if (r < 0) + return log_error_errno(r, "Failed to open verity device %s: %m", argv[4]); + + cryptsetup_enable_logging(cd); + + status = crypt_status(cd, argv[2]); + if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) { + log_info("Volume %s already active.", argv[2]); + return 0; + } + + 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, argv[3]); + if (r < 0) + return log_error_errno(r, "Failed to configure data device: %m"); + + if (argc > 6) { +#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY + _cleanup_free_ char *hash_sig = NULL; + size_t hash_sig_size; + char *value; + + if ((value = startswith(argv[6], "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", argv[6]); + } else { + r = read_full_file_full(AT_FDCWD, argv[6], 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, argv[2], m, l, hash_sig, hash_sig_size, CRYPT_ACTIVATE_READONLY); +#else + return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "activation of verity device with signature %s requested, but not supported by cryptsetup due to missing crypt_activate_by_signed_key()", argv[6]); +#endif + } else + r = crypt_activate_by_volume_key(cd, argv[2], m, l, CRYPT_ACTIVATE_READONLY); + if (r < 0) + return log_error_errno(r, "Failed to set up verity device: %m"); + + } else if (streq(argv[1], "detach")) { + + r = crypt_init_by_name(&cd, argv[2]); + if (r == -ENODEV) { + log_info("Volume %s already inactive.", argv[2]); + return 0; + } + if (r < 0) + return log_error_errno(r, "crypt_init_by_name() failed: %m"); + + cryptsetup_enable_logging(cd); + + r = crypt_deactivate(cd, argv[2]); + if (r < 0) + return log_error_errno(r, "Failed to deactivate: %m"); + + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", argv[1]); + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |