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-rw-r--r--src/integritysetup/integrity-util.c70
-rw-r--r--src/integritysetup/integrity-util.h19
-rw-r--r--src/integritysetup/integritysetup-generator.c181
-rw-r--r--src/integritysetup/integritysetup.c203
4 files changed, 473 insertions, 0 deletions
diff --git a/src/integritysetup/integrity-util.c b/src/integritysetup/integrity-util.c
new file mode 100644
index 0000000..c2d2f95
--- /dev/null
+++ b/src/integritysetup/integrity-util.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include "integrity-util.h"
+
+#include "extract-word.h"
+#include "fileio.h"
+#include "path-util.h"
+#include "percent-util.h"
+
+
+static int supported_integrity_algorithm(char *user_supplied) {
+ if (!STR_IN_SET(user_supplied, "crc32", "crc32c", "sha1", "sha256", "hmac-sha256"))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unsupported integrity algorithm (%s)", user_supplied);
+ return 0;
+}
+
+int parse_integrity_options(
+ const char *options,
+ uint32_t *ret_activate_flags,
+ int *ret_percent,
+ usec_t *ret_commit_time,
+ char **ret_data_device,
+ char **ret_integrity_alg) {
+ int r;
+
+ 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;
+ else if (streq(word, "allow-discards")) {
+ if (ret_activate_flags)
+ *ret_activate_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
+ } else if ((val = startswith(word, "journal-watermark="))) {
+ r = parse_percent(val);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse journal-watermark value or value out of range (%s)", val);
+ if (ret_percent)
+ *ret_percent = r;
+ } else if ((val = startswith(word, "journal-commit-time="))) {
+ usec_t tmp_commit_time;
+ r = parse_sec(val, &tmp_commit_time);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse journal-commit-time value (%s)", val);
+ if (ret_commit_time)
+ *ret_commit_time = tmp_commit_time;
+ } else if ((val = startswith(word, "data-device="))) {
+ if (ret_data_device) {
+ r = free_and_strdup(ret_data_device, val);
+ if (r < 0)
+ return log_oom();
+ }
+ } else if ((val = startswith(word, "integrity-algorithm="))) {
+ r = supported_integrity_algorithm(val);
+ if (r < 0)
+ return r;
+ if (ret_integrity_alg) {
+ r = free_and_strdup(ret_integrity_alg, val);
+ if (r < 0)
+ return log_oom();
+ }
+ } else
+ log_warning("Encountered unknown option '%s', ignoring.", word);
+ }
+
+ return r;
+}
diff --git a/src/integritysetup/integrity-util.h b/src/integritysetup/integrity-util.h
new file mode 100644
index 0000000..b27975c
--- /dev/null
+++ b/src/integritysetup/integrity-util.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdint.h>
+
+#include "cryptsetup-util.h"
+#include "time-util.h"
+
+
+int parse_integrity_options(
+ const char *options,
+ uint32_t *ret_activate_flags,
+ int *ret_percent,
+ usec_t *ret_commit_time,
+ char **ret_data_device,
+ char **ret_integrity_alg);
+
+#define DM_HMAC_256 "hmac(sha256)"
+#define DM_MAX_KEY_SIZE 4096 /* Maximum size of key allowed for dm-integrity */
diff --git a/src/integritysetup/integritysetup-generator.c b/src/integritysetup/integritysetup-generator.c
new file mode 100644
index 0000000..15f5089
--- /dev/null
+++ b/src/integritysetup/integritysetup-generator.c
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "hexdecoct.h"
+#include "id128-util.h"
+#include "integrity-util.h"
+#include "main-func.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "unit-name.h"
+
+static const char *arg_dest = NULL;
+static const char *arg_integritytab = NULL;
+static char *arg_options = NULL;
+STATIC_DESTRUCTOR_REGISTER(arg_options, freep);
+
+static int create_disk(
+ const char *name,
+ const char *device,
+ const char *key_file,
+ const char *options) {
+
+ _cleanup_free_ char *n = NULL, *dd = NULL, *e = NULL, *name_escaped = NULL, *key_file_escaped = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+ char *dmname = NULL;
+
+ assert(name);
+ assert(device);
+
+ name_escaped = specifier_escape(name);
+ if (!name_escaped)
+ return log_oom();
+
+ e = unit_name_escape(name);
+ if (!e)
+ return log_oom();
+
+ r = unit_name_build("systemd-integritysetup", e, ".service", &n);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ r = unit_name_from_path(device, ".device", &dd);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ r = generator_open_unit_file(arg_dest, NULL, n, &f);
+ if (r < 0)
+ return r;
+
+ if (key_file) {
+ if (!path_is_absolute(key_file))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute file path %s", key_file);
+
+ key_file_escaped = specifier_escape(key_file);
+ if (!key_file_escaped)
+ return log_oom();
+ }
+
+ if (options) {
+ r = parse_integrity_options(options, NULL, NULL, NULL, NULL, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ fprintf(f,
+ "[Unit]\n"
+ "Description=Integrity Setup for %%I\n"
+ "Documentation=man:integritytab(5) man:systemd-integritysetup-generator(8) man:systemd-integritysetup@.service(8)\n"
+ "SourcePath=%s\n"
+ "DefaultDependencies=no\n"
+ "IgnoreOnIsolate=true\n"
+ "After=integritysetup-pre.target systemd-udevd-kernel.socket\n"
+ "Before=blockdev@dev-mapper-%%i.target\n"
+ "Wants=blockdev@dev-mapper-%%i.target\n"
+ "Conflicts=umount.target\n"
+ "Before=integritysetup.target\n"
+ "BindsTo=%s\n"
+ "After=%s\n"
+ "Before=umount.target\n",
+ arg_integritytab,
+ dd, dd);
+
+ fprintf(f,
+ "\n"
+ "[Service]\n"
+ "Type=oneshot\n"
+ "RemainAfterExit=yes\n"
+ "TimeoutSec=0\n"
+ "ExecStart=" ROOTLIBEXECDIR "/systemd-integritysetup attach '%s' '%s' '%s' '%s'\n"
+ "ExecStop=" ROOTLIBEXECDIR "/systemd-integritysetup detach '%s'\n",
+ name_escaped, device, empty_to_dash(key_file_escaped), empty_to_dash(options),
+ name_escaped);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", n);
+
+ r = generator_add_symlink(arg_dest, "integritysetup.target", "requires", n);
+ if (r < 0)
+ return r;
+
+ dmname = strjoina("dev-mapper-", e, ".device");
+ return generator_add_symlink(arg_dest, dmname, "requires", n);
+}
+
+static int add_integritytab_devices(void) {
+ _cleanup_fclose_ FILE *f = NULL;
+ unsigned integritytab_line = 0;
+ int r;
+
+ r = fopen_unlocked(arg_integritytab, "re", &f);
+ if (r < 0) {
+ if (errno != ENOENT)
+ log_error_errno(errno, "Failed to open %s: %m", arg_integritytab);
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL, *name = NULL, *device_id = NULL, *device_path = NULL, *key_file = NULL, *options = NULL;
+ char *l;
+
+ r = read_line(f, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read %s: %m", arg_integritytab);
+ if (r == 0)
+ break;
+
+ integritytab_line++;
+
+ l = strstrip(line);
+ if (!l)
+ continue;
+
+ if (IN_SET(l[0], 0, '#'))
+ continue;
+
+ /* The key file and the options are optional */
+ r = sscanf(l, "%ms %ms %ms %ms", &name, &device_id, &key_file, &options);
+ if (!IN_SET(r, 2, 3, 4)) {
+ log_error("Failed to parse %s:%u, ignoring.", l, integritytab_line);
+ continue;
+ }
+
+ device_path = fstab_node_to_udev_node(device_id);
+ if (!device_path) {
+ log_error("Failed to find device %s:%u, ignoring.", device_id, integritytab_line);
+ continue;
+ }
+
+ r = create_disk(name, device_path, empty_or_dash_to_null(key_file), empty_or_dash_to_null(options));
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+ assert_se(arg_dest = dest);
+
+ arg_integritytab = getenv("SYSTEMD_INTEGRITYTAB") ?: "/etc/integritytab";
+
+ return add_integritytab_devices();
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);
diff --git a/src/integritysetup/integritysetup.c b/src/integritysetup/integritysetup.c
new file mode 100644
index 0000000..a602886
--- /dev/null
+++ b/src/integritysetup/integritysetup.c
@@ -0,0 +1,203 @@
+/* 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 "integrity-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "memory-util.h"
+#include "parse-util.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;
+static int arg_percent;
+static usec_t arg_commit_time;
+static char *arg_existing_data_device;
+static char *arg_integrity_algorithm;
+
+STATIC_DESTRUCTOR_REGISTER(arg_existing_data_device, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_integrity_algorithm, freep);
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-integritysetup@.service", "8", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s attach VOLUME DEVICE [HMAC_KEY_FILE|-] [OPTIONS]\n"
+ "%s detach VOLUME\n\n"
+ "Attach or detach 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 load_key_file(
+ const char *key_file,
+ void **ret_key_file_contents,
+ size_t *ret_key_file_size) {
+ int r;
+ _cleanup_(erase_and_freep) char *tmp_key_file_contents = NULL;
+ size_t tmp_key_file_size;
+
+ if (!path_is_absolute(key_file))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute path: %s", key_file);
+
+ r = read_full_file_full(
+ AT_FDCWD, key_file, UINT64_MAX, DM_MAX_KEY_SIZE,
+ READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET|READ_FULL_FILE_FAIL_WHEN_LARGER,
+ NULL,
+ &tmp_key_file_contents, &tmp_key_file_size);
+ if (r < 0)
+ return log_error_errno(r, "Failed to process key file: %m");
+
+ if (ret_key_file_contents && ret_key_file_size) {
+ *ret_key_file_contents = TAKE_PTR(tmp_key_file_contents);
+ *ret_key_file_size = tmp_key_file_size;
+ }
+
+ return 0;
+}
+
+static const char *integrity_algorithm_select(const void *key_file_buf) {
+ /* To keep a bit of sanity for end users, the subset of integrity
+ algorithms we support will match what is used in integritysetup */
+ if (arg_integrity_algorithm) {
+ if (streq("hmac-sha256", arg_integrity_algorithm))
+ return DM_HMAC_256;
+ return arg_integrity_algorithm;
+ } else if (key_file_buf)
+ return DM_HMAC_256;
+ return "crc32c";
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+ char *verb, *volume;
+ 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.");
+
+ verb = argv[1];
+ volume = argv[2];
+
+ log_setup();
+
+ cryptsetup_enable_logging(NULL);
+
+ umask(0022);
+
+ if (streq(verb, "attach")) {
+ /* attach name device optional_key_file optional_options */
+
+ crypt_status_info status;
+ _cleanup_(erase_and_freep) void *key_buf = NULL;
+ const char *device, *key_file, *options;
+ size_t key_buf_size = 0;
+
+ if (argc < 4)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least three arguments.");
+
+ if (argc > 6)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach has a maximum of five arguments.");
+
+ device = argv[3];
+ key_file = mangle_none(argc > 4 ? argv[4] : NULL);
+ options = mangle_none(argc > 5 ? argv[5] : NULL);
+
+ if (!filename_is_valid(volume))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
+
+ if (key_file) {
+ r = load_key_file(key_file, &key_buf, &key_buf_size);
+ if (r < 0)
+ return r;
+ }
+
+ if (options) {
+ r = parse_integrity_options(options, &arg_activate_flags, &arg_percent,
+ &arg_commit_time, &arg_existing_data_device, &arg_integrity_algorithm);
+ if (r < 0)
+ return r;
+ }
+
+ r = crypt_init(&cd, device);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open integrity device %s: %m", 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;
+ }
+
+ r = crypt_load(cd,
+ CRYPT_INTEGRITY,
+ &(struct crypt_params_integrity) {
+ .journal_watermark = arg_percent,
+ .journal_commit_time = DIV_ROUND_UP(arg_commit_time, USEC_PER_SEC),
+ .integrity = integrity_algorithm_select(key_buf),
+ });
+ if (r < 0)
+ return log_error_errno(r, "Failed to load integrity superblock: %m");
+
+ if (!isempty(arg_existing_data_device)) {
+ r = crypt_set_data_device(cd, arg_existing_data_device);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add separate data device: %m");
+ }
+
+ r = crypt_activate_by_volume_key(cd, volume, key_buf, key_buf_size, arg_activate_flags);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set up integrity device: %m");
+
+ } else if (streq(verb, "detach")) {
+
+ if (argc > 3)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "detach has a maximum of two arguments.");
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 02:10:56 +0000