Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 431 insertions, 0 deletions

diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c
new file mode 100644
index 0000000..d73c2d3
--- /dev/null
+++ b/src/veritysetup/veritysetup.c
@@ -0,0 +1,431 @@
+/* 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 "fstab-util.h"
+#include "hexdecoct.h"
+#include "log.h"
+#include "main-func.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 char *arg_hash = NULL;
+static bool arg_superblock = true;
+static int arg_format = 1;
+static uint64_t arg_data_block_size = 4096;
+static uint64_t arg_hash_block_size = 4096;
+static uint64_t arg_data_blocks = 0;
+static uint64_t arg_hash_offset = 0;
+static void *arg_salt = NULL;
+static uint64_t arg_salt_size = 32;
+static char *arg_uuid = NULL;
+static uint32_t arg_activate_flags = CRYPT_ACTIVATE_READONLY;
+static char *arg_fec_what = NULL;
+static uint64_t arg_fec_offset = 0;
+static uint64_t arg_fec_roots = 2;
+static char *arg_root_hash_signature = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_hash, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_salt, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_uuid, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_fec_what, freep);
+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_block_size(const char *t, uint64_t *size) {
+        uint64_t u;
+        int r;
+
+        r = parse_size(t, 1024, &u);
+        if (r < 0)
+                return r;
+
+        if (u < 512 || u > (512 * 1024))
+                return -ERANGE;
+
+        if ((u % 512) != 0 || !ISPOWEROF2(u))
+                return -EINVAL;
+
+        *size = u;
+
+        return 0;
+}
+
+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, "superblock="))) {
+
+                        r = parse_boolean(val);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse boolean '%s': %m", word);
+
+                        arg_superblock = r;
+                } else if ((val = startswith(word, "format="))) {
+
+                        if (!STR_IN_SET(val, "0", "1"))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "format= expects either 0 (original Chrome OS version) or "
+                                                                                "1 (modern version).");
+
+                        arg_format = val[0] - '0';
+                } else if ((val = startswith(word, "data-block-size="))) {
+                        uint64_t sz;
+
+                        r = parse_block_size(val, &sz);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse size '%s': %m", word);
+
+                        arg_data_block_size = sz;
+                } else if ((val = startswith(word, "hash-block-size="))) {
+                        uint64_t sz;
+
+                        r = parse_block_size(val, &sz);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse size '%s': %m", word);
+
+                        arg_hash_block_size = sz;
+                } else if ((val = startswith(word, "data-blocks="))) {
+                        uint64_t u;
+
+                        r = safe_atou64(val, &u);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse number '%s': %m", word);
+
+                        arg_data_blocks = u;
+                } else if ((val = startswith(word, "hash-offset="))) {
+                        uint64_t off;
+
+                        r = parse_size(val, 1024, &off);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse offset '%s': %m", word);
+                        if (off % 512 != 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "hash-offset= expects a 512-byte aligned value.");
+
+                        arg_hash_offset = off;
+                } else if ((val = startswith(word, "salt="))) {
+
+                        if (!string_is_safe(val))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "salt= is not valid.");
+
+                        if (isempty(val)) {
+                                arg_salt = mfree(arg_salt);
+                                arg_salt_size = 32;
+                        } else if (streq(val, "-")) {
+                                arg_salt = mfree(arg_salt);
+                                arg_salt_size = 0;
+                        } else {
+                                size_t l;
+                                void *m;
+
+                                r = unhexmem(val, strlen(val), &m, &l);
+                                if (r < 0)
+                                        return log_error_errno(r, "Failed to parse salt '%s': %m", word);
+
+                                free_and_replace(arg_salt, m);
+                                arg_salt_size = l;
+                        }
+                } else if ((val = startswith(word, "uuid="))) {
+
+                        r = sd_id128_from_string(val, NULL);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse UUID '%s': %m", word);
+
+                        r = free_and_strdup(&arg_uuid, val);
+                        if (r < 0)
+                                return log_oom();
+                } else if ((val = startswith(word, "hash="))) {
+
+                        r = free_and_strdup(&arg_hash, val);
+                        if (r < 0)
+                                return log_oom();
+                } else if ((val = startswith(word, "fec-device="))) {
+                        _cleanup_free_ char *what = NULL;
+
+                        what = fstab_node_to_udev_node(val);
+                        if (!what)
+                                return log_oom();
+
+                        if (!path_is_absolute(what))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-device= expects an absolute path.");
+
+                        if (!path_is_normalized(what))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-device= expects an normalized path.");
+
+                        r = free_and_strdup(&arg_fec_what, what);
+                        if (r < 0)
+                                return log_oom();
+                } else if ((val = startswith(word, "fec-offset="))) {
+                        uint64_t off;
+
+                        r = parse_size(val, 1024, &off);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse offset '%s': %m", word);
+                        if (off % 512 != 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-offset= expects a 512-byte aligned value.");
+
+                        arg_fec_offset = off;
+                } else if ((val = startswith(word, "fec-roots="))) {
+                        uint64_t u;
+
+                        r = safe_atou64(val, &u);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse number '%s', ignoring: %m", word);
+                        if (u < 2 || u > 24)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "fec-rootfs= expects a value between 2 and 24 (including).");
+
+                        arg_fec_roots = u;
+                } 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;
+                struct crypt_params_verity p = {};
+                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");
+                }
+
+                if (arg_superblock) {
+                        p = (struct crypt_params_verity) {
+                                .fec_device = arg_fec_what,
+                                .hash_area_offset = arg_hash_offset,
+                                .fec_area_offset = arg_fec_offset,
+                                .fec_roots = arg_fec_roots,
+                        };
+
+                        r = crypt_load(cd, CRYPT_VERITY, &p);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to load verity superblock: %m");
+                } else {
+                        p = (struct crypt_params_verity) {
+                                .hash_name = arg_hash,
+                                .data_device = data_device,
+                                .fec_device = arg_fec_what,
+                                .salt = arg_salt,
+                                .salt_size = arg_salt_size,
+                                .hash_type = arg_format,
+                                .data_block_size = arg_data_block_size,
+                                .hash_block_size = arg_hash_block_size,
+                                .data_size = arg_data_blocks,
+                                .hash_area_offset = arg_hash_offset,
+                                .fec_area_offset = arg_fec_offset,
+                                .fec_roots = arg_fec_roots,
+                                .flags = CRYPT_VERITY_NO_HEADER,
+                        };
+
+                        r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, arg_uuid, NULL, 0, &p);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to format 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 '%s': %m", volume);
+
+        } 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() for volume '%s' failed: %m", volume);
+
+                cryptsetup_enable_logging(cd);
+
+                r = crypt_deactivate(cd, volume);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to deactivate volume '%s': %m", volume);
+
+        } else
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);