int journal_file_append_first_tag(JournalFile *f) {
int r;
uint64_t p;
if (!f->seal)
return 0;
log_debug("Calculating first tag...");
r = journal_file_hmac_put_header(f);
if (r < 0)
return r;
p = le64toh(f->header->field_hash_table_offset);
if (p < offsetof(Object, hash_table.items))
return -EINVAL;
p -= offsetof(Object, hash_table.items);
r = journal_file_hmac_put_object(f, OBJECT_FIELD_HASH_TABLE, NULL, p);
if (r < 0)
return r;
p = le64toh(f->header->data_hash_table_offset);
if (p < offsetof(Object, hash_table.items))
return -EINVAL;
p -= offsetof(Object, hash_table.items);
r = journal_file_hmac_put_object(f, OBJECT_DATA_HASH_TABLE, NULL, p);
if (r < 0)
return r;
r = journal_file_append_tag(f);
if (r < 0)
return r;
return 0;
}
int journal_file_append_tag(JournalFile *f) {
Object *o;
uint64_t p;
int r;
assert(f);
if (!f->seal)
return 0;
if (!f->hmac_running)
return 0;
assert(f->hmac);
r = journal_file_append_object(f, OBJECT_TAG, sizeof(struct TagObject), &o, &p);
if (r < 0)
return r;
o->tag.seqnum = htole64(journal_file_tag_seqnum(f));
o->tag.epoch = htole64(FSPRG_GetEpoch(f->fsprg_state));
log_debug("Writing tag %"PRIu64" for epoch %"PRIu64"",
le64toh(o->tag.seqnum),
FSPRG_GetEpoch(f->fsprg_state));
/* Add the tag object itself, so that we can protect its
* header. This will exclude the actual hash value in it */
r = journal_file_hmac_put_object(f, OBJECT_TAG, o, p);
if (r < 0)
return r;
/* Get the HMAC tag and store it in the object */
memcpy(o->tag.tag, gcry_md_read(f->hmac, 0), TAG_LENGTH);
f->hmac_running = false;
return 0;
}
int journal_file_verify(
JournalFile *f,
const char *key,
usec_t *first_contained, usec_t *last_validated, usec_t *last_contained,
bool show_progress) {
int r;
Object *o;
uint64_t p = 0, last_epoch = 0, last_tag_realtime = 0, last_sealed_realtime = 0;
uint64_t entry_seqnum = 0, entry_monotonic = 0, entry_realtime = 0;
sd_id128_t entry_boot_id;
bool entry_seqnum_set = false, entry_monotonic_set = false, entry_realtime_set = false, found_main_entry_array = false;
uint64_t n_weird = 0, n_objects = 0, n_entries = 0, n_data = 0, n_fields = 0, n_data_hash_tables = 0, n_field_hash_tables = 0, n_entry_arrays = 0, n_tags = 0;
usec_t last_usec = 0;
int data_fd = -1, entry_fd = -1, entry_array_fd = -1;
unsigned i;
bool found_last = false;
#ifdef HAVE_GCRYPT
uint64_t last_tag = 0;
#endif
assert(f);
if (key) {
#ifdef HAVE_GCRYPT
r = journal_file_parse_verification_key(f, key);
if (r < 0) {
log_error("Failed to parse seed.");
return r;
}
#else
return -ENOTSUP;
#endif
} else if (f->seal)
return -ENOKEY;
data_fd = open_tmpfile("/var/tmp", O_RDWR | O_CLOEXEC);
if (data_fd < 0) {
log_error_errno(errno, "Failed to create data file: %m");
r = -errno;
goto fail;
}
entry_fd = open_tmpfile("/var/tmp", O_RDWR | O_CLOEXEC);
if (entry_fd < 0) {
log_error_errno(errno, "Failed to create entry file: %m");
r = -errno;
goto fail;
}
entry_array_fd = open_tmpfile("/var/tmp", O_RDWR | O_CLOEXEC);
if (entry_array_fd < 0) {
log_error_errno(errno, "Failed to create entry array file: %m");
r = -errno;
goto fail;
}
if (le32toh(f->header->compatible_flags) & ~HEADER_COMPATIBLE_SUPPORTED) {
log_error("Cannot verify file with unknown extensions.");
r = -ENOTSUP;
goto fail;
}
for (i = 0; i < sizeof(f->header->reserved); i++)
if (f->header->reserved[i] != 0) {
error(offsetof(Header, reserved[i]), "Reserved field is non-zero");
r = -EBADMSG;
goto fail;
}
/* First iteration: we go through all objects, verify the
* superficial structure, headers, hashes. */
p = le64toh(f->header->header_size);
for (;;) {
/* Early exit if there are no objects in the file, at all */
if (le64toh(f->header->tail_object_offset) == 0)
break;
if (show_progress)
draw_progress(scale_progress(0x7FFF, p, le64toh(f->header->tail_object_offset)), &last_usec);
r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &o);
if (r < 0) {
error(p, "Invalid object");
goto fail;
}
if (p > le64toh(f->header->tail_object_offset)) {
error(offsetof(Header, tail_object_offset), "Invalid tail object pointer");
r = -EBADMSG;
goto fail;
}
n_objects ++;
r = journal_file_object_verify(f, p, o);
if (r < 0) {
error(p, "Invalid object contents: %s", strerror(-r));
goto fail;
}
if ((o->object.flags & OBJECT_COMPRESSED_XZ) &&
(o->object.flags & OBJECT_COMPRESSED_LZ4)) {
error(p, "Objected with double compression");
r = -EINVAL;
goto fail;
}
if ((o->object.flags & OBJECT_COMPRESSED_XZ) && !JOURNAL_HEADER_COMPRESSED_XZ(f->header)) {
error(p, "XZ compressed object in file without XZ compression");
r = -EBADMSG;
goto fail;
}
if ((o->object.flags & OBJECT_COMPRESSED_LZ4) && !JOURNAL_HEADER_COMPRESSED_LZ4(f->header)) {
error(p, "LZ4 compressed object in file without LZ4 compression");
r = -EBADMSG;
goto fail;
}
switch (o->object.type) {
case OBJECT_DATA:
r = write_uint64(data_fd, p);
if (r < 0)
goto fail;
n_data++;
break;
case OBJECT_FIELD:
n_fields++;
break;
case OBJECT_ENTRY:
if (JOURNAL_HEADER_SEALED(f->header) && n_tags <= 0) {
error(p, "First entry before first tag");
r = -EBADMSG;
goto fail;
}
r = write_uint64(entry_fd, p);
if (r < 0)
goto fail;
if (le64toh(o->entry.realtime) < last_tag_realtime) {
error(p, "Older entry after newer tag");
r = -EBADMSG;
goto fail;
}
if (!entry_seqnum_set &&
le64toh(o->entry.seqnum) != le64toh(f->header->head_entry_seqnum)) {
error(p, "Head entry sequence number incorrect");
r = -EBADMSG;
goto fail;
}
if (entry_seqnum_set &&
entry_seqnum >= le64toh(o->entry.seqnum)) {
error(p, "Entry sequence number out of synchronization");
r = -EBADMSG;
goto fail;
}
entry_seqnum = le64toh(o->entry.seqnum);
entry_seqnum_set = true;
if (entry_monotonic_set &&
sd_id128_equal(entry_boot_id, o->entry.boot_id) &&
entry_monotonic > le64toh(o->entry.monotonic)) {
error(p, "Entry timestamp out of synchronization");
r = -EBADMSG;
goto fail;
}
entry_monotonic = le64toh(o->entry.monotonic);
entry_boot_id = o->entry.boot_id;
entry_monotonic_set = true;
if (!entry_realtime_set &&
le64toh(o->entry.realtime) != le64toh(f->header->head_entry_realtime)) {
error(p, "Head entry realtime timestamp incorrect");
r = -EBADMSG;
goto fail;
}
entry_realtime = le64toh(o->entry.realtime);
entry_realtime_set = true;
n_entries ++;
break;
case OBJECT_DATA_HASH_TABLE:
if (n_data_hash_tables > 1) {
error(p, "More than one data hash table");
r = -EBADMSG;
goto fail;
}
if (le64toh(f->header->data_hash_table_offset) != p + offsetof(HashTableObject, items) ||
le64toh(f->header->data_hash_table_size) != le64toh(o->object.size) - offsetof(HashTableObject, items)) {
error(p, "header fields for data hash table invalid");
r = -EBADMSG;
goto fail;
}
n_data_hash_tables++;
break;
case OBJECT_FIELD_HASH_TABLE:
if (n_field_hash_tables > 1) {
error(p, "More than one field hash table");
r = -EBADMSG;
goto fail;
}
if (le64toh(f->header->field_hash_table_offset) != p + offsetof(HashTableObject, items) ||
le64toh(f->header->field_hash_table_size) != le64toh(o->object.size) - offsetof(HashTableObject, items)) {
error(p, "Header fields for field hash table invalid");
r = -EBADMSG;
goto fail;
}
n_field_hash_tables++;
break;
case OBJECT_ENTRY_ARRAY:
r = write_uint64(entry_array_fd, p);
if (r < 0)
goto fail;
if (p == le64toh(f->header->entry_array_offset)) {
if (found_main_entry_array) {
error(p, "More than one main entry array");
r = -EBADMSG;
goto fail;
}
found_main_entry_array = true;
}
n_entry_arrays++;
break;
case OBJECT_TAG:
if (!JOURNAL_HEADER_SEALED(f->header)) {
error(p, "Tag object in file without sealing");
r = -EBADMSG;
goto fail;
}
if (le64toh(o->tag.seqnum) != n_tags + 1) {
error(p, "Tag sequence number out of synchronization");
r = -EBADMSG;
goto fail;
}
if (le64toh(o->tag.epoch) < last_epoch) {
error(p, "Epoch sequence out of synchronization");
r = -EBADMSG;
goto fail;
}
#ifdef HAVE_GCRYPT
if (f->seal) {
uint64_t q, rt;
debug(p, "Checking tag %"PRIu64"...", le64toh(o->tag.seqnum));
rt = f->fss_start_usec + o->tag.epoch * f->fss_interval_usec;
if (entry_realtime_set && entry_realtime >= rt + f->fss_interval_usec) {
error(p, "tag/entry realtime timestamp out of synchronization");
r = -EBADMSG;
goto fail;
}
/* OK, now we know the epoch. So let's now set
* it, and calculate the HMAC for everything
* since the last tag. */
r = journal_file_fsprg_seek(f, le64toh(o->tag.epoch));
if (r < 0)
goto fail;
r = journal_file_hmac_start(f);
if (r < 0)
goto fail;
if (last_tag == 0) {
r = journal_file_hmac_put_header(f);
if (r < 0)
goto fail;
q = le64toh(f->header->header_size);
} else
q = last_tag;
while (q <= p) {
r = journal_file_move_to_object(f, OBJECT_UNUSED, q, &o);
if (r < 0)
goto fail;
r = journal_file_hmac_put_object(f, OBJECT_UNUSED, o, q);
if (r < 0)
goto fail;
q = q + ALIGN64(le64toh(o->object.size));
}
/* Position might have changed, let's reposition things */
r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &o);
if (r < 0)
goto fail;
if (memcmp(o->tag.tag, gcry_md_read(f->hmac, 0), TAG_LENGTH) != 0) {
error(p, "Tag failed verification");
r = -EBADMSG;
goto fail;
}
f->hmac_running = false;
last_tag_realtime = rt;
last_sealed_realtime = entry_realtime;
}
last_tag = p + ALIGN64(le64toh(o->object.size));
#endif
last_epoch = le64toh(o->tag.epoch);
n_tags ++;
break;
default:
n_weird ++;
}
if (p == le64toh(f->header->tail_object_offset)) {
found_last = true;
break;
}
p = p + ALIGN64(le64toh(o->object.size));
};
if (!found_last && le64toh(f->header->tail_object_offset) != 0) {
error(le64toh(f->header->tail_object_offset), "Tail object pointer dead");
r = -EBADMSG;
goto fail;
}
if (n_objects != le64toh(f->header->n_objects)) {
error(offsetof(Header, n_objects), "Object number mismatch");
r = -EBADMSG;
goto fail;
}
if (n_entries != le64toh(f->header->n_entries)) {
error(offsetof(Header, n_entries), "Entry number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_data) &&
n_data != le64toh(f->header->n_data)) {
error(offsetof(Header, n_data), "Data number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_fields) &&
n_fields != le64toh(f->header->n_fields)) {
error(offsetof(Header, n_fields), "Field number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_tags) &&
n_tags != le64toh(f->header->n_tags)) {
error(offsetof(Header, n_tags), "Tag number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays) &&
n_entry_arrays != le64toh(f->header->n_entry_arrays)) {
error(offsetof(Header, n_entry_arrays), "Entry array number mismatch");
r = -EBADMSG;
goto fail;
}
if (!found_main_entry_array && le64toh(f->header->entry_array_offset) != 0) {
error(0, "Missing entry array");
r = -EBADMSG;
goto fail;
}
if (entry_seqnum_set &&
entry_seqnum != le64toh(f->header->tail_entry_seqnum)) {
error(offsetof(Header, tail_entry_seqnum), "Invalid tail seqnum");
r = -EBADMSG;
goto fail;
}
if (entry_monotonic_set &&
(!sd_id128_equal(entry_boot_id, f->header->boot_id) ||
entry_monotonic != le64toh(f->header->tail_entry_monotonic))) {
error(0, "Invalid tail monotonic timestamp");
r = -EBADMSG;
goto fail;
}
if (entry_realtime_set && entry_realtime != le64toh(f->header->tail_entry_realtime)) {
error(0, "Invalid tail realtime timestamp");
r = -EBADMSG;
goto fail;
}
/* Second iteration: we follow all objects referenced from the
* two entry points: the object hash table and the entry
* array. We also check that everything referenced (directly
* or indirectly) in the data hash table also exists in the
* entry array, and vice versa. Note that we do not care for
* unreferenced objects. We only care that everything that is
* referenced is consistent. */
r = verify_entry_array(f,
data_fd, n_data,
entry_fd, n_entries,
entry_array_fd, n_entry_arrays,
&last_usec,
show_progress);
if (r < 0)
goto fail;
r = verify_hash_table(f,
data_fd, n_data,
entry_fd, n_entries,
entry_array_fd, n_entry_arrays,
&last_usec,
show_progress);
if (r < 0)
goto fail;
if (show_progress)
flush_progress();
mmap_cache_close_fd(f->mmap, data_fd);
mmap_cache_close_fd(f->mmap, entry_fd);
mmap_cache_close_fd(f->mmap, entry_array_fd);
safe_close(data_fd);
safe_close(entry_fd);
safe_close(entry_array_fd);
if (first_contained)
*first_contained = le64toh(f->header->head_entry_realtime);
if (last_validated)
*last_validated = last_sealed_realtime;
if (last_contained)
*last_contained = le64toh(f->header->tail_entry_realtime);
return 0;
fail:
if (show_progress)
flush_progress();
log_error("File corruption detected at %s:"OFSfmt" (of %llu bytes, %"PRIu64"%%).",
f->path,
p,
(unsigned long long) f->last_stat.st_size,
100 * p / f->last_stat.st_size);
if (data_fd >= 0) {
mmap_cache_close_fd(f->mmap, data_fd);
safe_close(data_fd);
}
if (entry_fd >= 0) {
mmap_cache_close_fd(f->mmap, entry_fd);
safe_close(entry_fd);
}
if (entry_array_fd >= 0) {
mmap_cache_close_fd(f->mmap, entry_array_fd);
safe_close(entry_array_fd);
}
return r;
}