/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
***/
#include
#include
#include
#include "util.h"
#include "macro.h"
#include "journal-def.h"
#include "journal-file.h"
#include "journal-authenticate.h"
#include "journal-verify.h"
#include "lookup3.h"
#include "compress.h"
#include "fsprg.h"
/* FIXME:
*
* - evolve key even if nothing happened in regular intervals
* - add macro for accessing flags
*
* - Allow building without libgcrypt
* - check with sparse
* - 64bit conversions
*
* */
static int journal_file_object_verify(JournalFile *f, Object *o) {
uint64_t i;
assert(f);
assert(o);
/* This does various superficial tests about the length an
* possible field values. It does not follow any references to
* other objects. */
if ((o->object.flags & OBJECT_COMPRESSED) &&
o->object.type != OBJECT_DATA)
return -EBADMSG;
switch (o->object.type) {
case OBJECT_DATA: {
uint64_t h1, h2;
if (le64toh(o->data.entry_offset) <= 0 ||
le64toh(o->data.n_entries) <= 0)
return -EBADMSG;
if (le64toh(o->object.size) - offsetof(DataObject, payload) <= 0)
return -EBADMSG;
h1 = le64toh(o->data.hash);
if (o->object.flags & OBJECT_COMPRESSED) {
void *b = NULL;
uint64_t alloc = 0, b_size;
if (!uncompress_blob(o->data.payload,
le64toh(o->object.size) - offsetof(Object, data.payload),
&b, &alloc, &b_size))
return -EBADMSG;
h2 = hash64(b, b_size);
free(b);
} else
h2 = hash64(o->data.payload, le64toh(o->object.size) - offsetof(Object, data.payload));
if (h1 != h2)
return -EBADMSG;
if (!VALID64(o->data.next_hash_offset) ||
!VALID64(o->data.next_field_offset) ||
!VALID64(o->data.entry_offset) ||
!VALID64(o->data.entry_array_offset))
return -EBADMSG;
break;
}
case OBJECT_FIELD:
if (le64toh(o->object.size) - offsetof(FieldObject, payload) <= 0)
return -EBADMSG;
if (!VALID64(o->field.next_hash_offset) ||
!VALID64(o->field.head_data_offset))
return -EBADMSG;
break;
case OBJECT_ENTRY:
if ((le64toh(o->object.size) - offsetof(EntryObject, items)) % sizeof(EntryItem) != 0)
return -EBADMSG;
if ((le64toh(o->object.size) - offsetof(EntryObject, items)) / sizeof(EntryItem) <= 0)
return -EBADMSG;
if (le64toh(o->entry.seqnum) <= 0 ||
!VALID_REALTIME(le64toh(o->entry.realtime)) ||
!VALID_MONOTONIC(le64toh(o->entry.monotonic)))
return -EBADMSG;
for (i = 0; i < journal_file_entry_n_items(o); i++) {
if (o->entry.items[i].object_offset == 0 ||
!VALID64(o->entry.items[i].object_offset))
return -EBADMSG;
}
break;
case OBJECT_DATA_HASH_TABLE:
case OBJECT_FIELD_HASH_TABLE:
if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) % sizeof(HashItem) != 0)
return -EBADMSG;
if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) / sizeof(HashItem) <= 0)
return -EBADMSG;
for (i = 0; i < journal_file_hash_table_n_items(o); i++) {
if (o->hash_table.items[i].head_hash_offset != 0 &&
!VALID64(le64toh(o->hash_table.items[i].head_hash_offset)))
return -EBADMSG;
if (o->hash_table.items[i].tail_hash_offset != 0 &&
!VALID64(le64toh(o->hash_table.items[i].tail_hash_offset)))
return -EBADMSG;
if ((o->hash_table.items[i].head_hash_offset != 0) !=
(o->hash_table.items[i].tail_hash_offset != 0))
return -EBADMSG;
}
break;
case OBJECT_ENTRY_ARRAY:
if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) % sizeof(le64_t) != 0)
return -EBADMSG;
if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) / sizeof(le64_t) <= 0)
return -EBADMSG;
if (!VALID64(o->entry_array.next_entry_array_offset))
return -EBADMSG;
for (i = 0; i < journal_file_entry_array_n_items(o); i++)
if (o->entry_array.items[i] != 0 &&
!VALID64(o->entry_array.items[i]))
return -EBADMSG;
break;
case OBJECT_TAG:
if (le64toh(o->object.size) != sizeof(TagObject))
return -EBADMSG;
if (!VALID_EPOCH(o->tag.epoch))
return -EBADMSG;
break;
}
return 0;
}
static void draw_progress(uint64_t p, usec_t *last_usec) {
unsigned n, i, j, k;
usec_t z, x;
if (!isatty(STDOUT_FILENO))
return;
z = now(CLOCK_MONOTONIC);
x = *last_usec;
if (x != 0 && x + 40 * USEC_PER_MSEC > z)
return;
*last_usec = z;
n = (3 * columns()) / 4;
j = (n * (unsigned) p) / 65535ULL;
k = n - j;
fputs("\r\x1B[?25l" ANSI_HIGHLIGHT_GREEN_ON, stdout);
for (i = 0; i < j; i++)
fputs("\xe2\x96\x88", stdout);
fputs(ANSI_HIGHLIGHT_OFF, stdout);
for (i = 0; i < k; i++)
fputs("\xe2\x96\x91", stdout);
printf(" %3lu%%", 100LU * (unsigned long) p / 65535LU);
fputs("\r\x1B[?25h", stdout);
fflush(stdout);
}
static void flush_progress(void) {
unsigned n, i;
if (!isatty(STDOUT_FILENO))
return;
n = (3 * columns()) / 4;
putchar('\r');
for (i = 0; i < n + 5; i++)
putchar(' ');
putchar('\r');
fflush(stdout);
}
static int write_uint64(int fd, uint64_t p) {
ssize_t k;
k = write(fd, &p, sizeof(p));
if (k < 0)
return -errno;
if (k != sizeof(p))
return -EIO;
return 0;
}
static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
uint64_t a, b;
int r;
assert(m);
assert(fd >= 0);
/* Bisection ... */
a = 0; b = n;
while (a < b) {
uint64_t c, *z;
c = (a + b) / 2;
r = mmap_cache_get(m, fd, PROT_READ|PROT_WRITE, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
if (r < 0)
return r;
if (*z == p)
return 1;
if (a + 1 >= b)
return 0;
if (p < *z)
b = c;
else {
a = c;
}
}
return 0;
}
static int entry_points_to_data(
JournalFile *f,
int entry_fd,
uint64_t n_entries,
uint64_t entry_p,
uint64_t data_p) {
int r;
uint64_t i, n, a;
Object *o;
bool found = false;
assert(f);
assert(entry_fd >= 0);
if (!contains_uint64(f->mmap, entry_fd, n_entries, entry_p)) {
log_error("Data object references invalid entry at %llu", (unsigned long long) data_p);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_ENTRY, entry_p, &o);
if (r < 0)
return r;
n = journal_file_entry_n_items(o);
for (i = 0; i < n; i++)
if (le64toh(o->entry.items[i].object_offset) == data_p) {
found = true;
break;
}
if (!found) {
log_error("Data object not referenced by linked entry at %llu", (unsigned long long) data_p);
return -EBADMSG;
}
/* Check if this entry is also in main entry array. Since the
* main entry array has already been verified we can rely on
* its consistency.*/
n = le64toh(f->header->n_entries);
a = le64toh(f->header->entry_array_offset);
i = 0;
while (i < n) {
uint64_t m, j;
r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
if (r < 0)
return r;
m = journal_file_entry_array_n_items(o);
for (j = 0; i < n && j < m; i++, j++)
if (le64toh(o->entry_array.items[j]) == entry_p)
return 0;
a = le64toh(o->entry_array.next_entry_array_offset);
}
return 0;
}
static int verify_data(
JournalFile *f,
Object *o, uint64_t p,
int entry_fd, uint64_t n_entries,
int entry_array_fd, uint64_t n_entry_arrays) {
uint64_t i, n, a, last, q;
int r;
assert(f);
assert(o);
assert(entry_fd >= 0);
assert(entry_array_fd >= 0);
n = le64toh(o->data.n_entries);
a = le64toh(o->data.entry_array_offset);
/* We already checked this earlier */
assert(n > 0);
last = q = le64toh(o->data.entry_offset);
r = entry_points_to_data(f, entry_fd, n_entries, q, p);
if (r < 0)
return r;
i = 1;
while (i < n) {
uint64_t next, m, j;
if (a == 0) {
log_error("Array chain too short at %llu", (unsigned long long) p);
return -EBADMSG;
}
if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
log_error("Invalid array at %llu", (unsigned long long) p);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
if (r < 0)
return r;
next = le64toh(o->entry_array.next_entry_array_offset);
if (next != 0 && next <= a) {
log_error("Array chain has cycle at %llu", (unsigned long long) p);
return -EBADMSG;
}
m = journal_file_entry_array_n_items(o);
for (j = 0; i < n && j < m; i++, j++) {
q = le64toh(o->entry_array.items[j]);
if (q <= last) {
log_error("Data object's entry array not sorted at %llu", (unsigned long long) p);
return -EBADMSG;
}
last = q;
r = entry_points_to_data(f, entry_fd, n_entries, q, p);
if (r < 0)
return r;
/* Pointer might have moved, reposition */
r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
if (r < 0)
return r;
}
a = next;
}
return 0;
}
static int verify_hash_table(
JournalFile *f,
int data_fd, uint64_t n_data,
int entry_fd, uint64_t n_entries,
int entry_array_fd, uint64_t n_entry_arrays,
usec_t *last_usec,
bool show_progress) {
uint64_t i, n;
int r;
assert(f);
assert(data_fd >= 0);
assert(entry_fd >= 0);
assert(entry_array_fd >= 0);
assert(last_usec);
n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
for (i = 0; i < n; i++) {
uint64_t last = 0, p;
if (show_progress)
draw_progress(0xC000 + (0x3FFF * i / n), last_usec);
p = le64toh(f->data_hash_table[i].head_hash_offset);
while (p != 0) {
Object *o;
uint64_t next;
if (!contains_uint64(f->mmap, data_fd, n_data, p)) {
log_error("Invalid data object at hash entry %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
if (r < 0)
return r;
next = le64toh(o->data.next_hash_offset);
if (next != 0 && next <= p) {
log_error("Hash chain has a cycle in hash entry %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
if (le64toh(o->data.hash) % n != i) {
log_error("Hash value mismatch in hash entry %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
r = verify_data(f, o, p, entry_fd, n_entries, entry_array_fd, n_entry_arrays);
if (r < 0)
return r;
last = p;
p = next;
}
if (last != le64toh(f->data_hash_table[i].tail_hash_offset)) {
log_error("Tail hash pointer mismatch in hash table");
return -EBADMSG;
}
}
return 0;
}
static int data_object_in_hash_table(JournalFile *f, uint64_t hash, uint64_t p) {
uint64_t n, h, q;
int r;
assert(f);
n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
h = hash % n;
q = le64toh(f->data_hash_table[h].head_hash_offset);
while (q != 0) {
Object *o;
if (p == q)
return 1;
r = journal_file_move_to_object(f, OBJECT_DATA, q, &o);
if (r < 0)
return r;
q = le64toh(o->data.next_hash_offset);
}
return 0;
}
static int verify_entry(
JournalFile *f,
Object *o, uint64_t p,
int data_fd, uint64_t n_data) {
uint64_t i, n;
int r;
assert(f);
assert(o);
assert(data_fd >= 0);
n = journal_file_entry_n_items(o);
for (i = 0; i < n; i++) {
uint64_t q, h;
Object *u;
q = le64toh(o->entry.items[i].object_offset);
h = le64toh(o->entry.items[i].hash);
if (!contains_uint64(f->mmap, data_fd, n_data, q)) {
log_error("Invalid data object at entry %llu",
(unsigned long long) p);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_DATA, q, &u);
if (r < 0)
return r;
if (le64toh(u->data.hash) != h) {
log_error("Hash mismatch for data object at entry %llu",
(unsigned long long) p);
return -EBADMSG;
}
r = data_object_in_hash_table(f, h, q);
if (r < 0)
return r;
if (r == 0) {
log_error("Data object missing from hash at entry %llu",
(unsigned long long) p);
return -EBADMSG;
}
}
return 0;
}
static int verify_entry_array(
JournalFile *f,
int data_fd, uint64_t n_data,
int entry_fd, uint64_t n_entries,
int entry_array_fd, uint64_t n_entry_arrays,
usec_t *last_usec,
bool show_progress) {
uint64_t i = 0, a, n, last = 0;
int r;
assert(f);
assert(data_fd >= 0);
assert(entry_fd >= 0);
assert(entry_array_fd >= 0);
assert(last_usec);
n = le64toh(f->header->n_entries);
a = le64toh(f->header->entry_array_offset);
while (i < n) {
uint64_t next, m, j;
Object *o;
if (show_progress)
draw_progress(0x8000 + (0x3FFF * i / n), last_usec);
if (a == 0) {
log_error("Array chain too short at %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
log_error("Invalid array at %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
if (r < 0)
return r;
next = le64toh(o->entry_array.next_entry_array_offset);
if (next != 0 && next <= a) {
log_error("Array chain has cycle at %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
m = journal_file_entry_array_n_items(o);
for (j = 0; i < n && j < m; i++, j++) {
uint64_t p;
p = le64toh(o->entry_array.items[j]);
if (p <= last) {
log_error("Entry array not sorted at %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
last = p;
if (!contains_uint64(f->mmap, entry_fd, n_entries, p)) {
log_error("Invalid array entry at %llu of %llu",
(unsigned long long) i, (unsigned long long) n);
return -EBADMSG;
}
r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
if (r < 0)
return r;
r = verify_entry(f, o, p, data_fd, n_data);
if (r < 0)
return r;
/* Pointer might have moved, reposition */
r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
if (r < 0)
return r;
}
a = next;
}
return 0;
}
static int journal_file_parse_verification_key(JournalFile *f, const char *key) {
uint8_t *seed;
size_t seed_size, c;
const char *k;
int r;
unsigned long long start, interval;
seed_size = FSPRG_RECOMMENDED_SEEDLEN;
seed = malloc(seed_size);
if (!seed)
return -ENOMEM;
k = key;
for (c = 0; c < seed_size; c++) {
int x, y;
while (*k == '-')
k++;
x = unhexchar(*k);
if (x < 0) {
free(seed);
return -EINVAL;
}
k++;
y = unhexchar(*k);
if (y < 0) {
free(seed);
return -EINVAL;
}
k++;
seed[c] = (uint8_t) (x * 16 + y);
}
if (*k != '/') {
free(seed);
return -EINVAL;
}
k++;
r = sscanf(k, "%llx-%llx", &start, &interval);
if (r != 2) {
free(seed);
return -EINVAL;
}
f->fsprg_seed = seed;
f->fsprg_seed_size = seed_size;
f->fss_start_usec = start * interval;
f->fss_interval_usec = interval;
return 0;
}
int journal_file_verify(
JournalFile *f,
const char *key,
usec_t *first_validated, usec_t *last_validated, usec_t *last_contained,
bool show_progress) {
int r;
Object *o;
uint64_t p = 0, last_tag = 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;
char data_path[] = "/var/tmp/journal-data-XXXXXX",
entry_path[] = "/var/tmp/journal-entry-XXXXXX",
entry_array_path[] = "/var/tmp/journal-entry-array-XXXXXX";
unsigned i;
bool found_last;
assert(f);
if (key) {
r = journal_file_parse_verification_key(f, key);
if (r < 0) {
log_error("Failed to parse seed.");
return r;
}
} else if (f->seal)
return -ENOKEY;
data_fd = mkostemp(data_path, O_CLOEXEC);
if (data_fd < 0) {
log_error("Failed to create data file: %m");
r = -errno;
goto fail;
}
unlink(data_path);
entry_fd = mkostemp(entry_path, O_CLOEXEC);
if (entry_fd < 0) {
log_error("Failed to create entry file: %m");
r = -errno;
goto fail;
}
unlink(entry_path);
entry_array_fd = mkostemp(entry_array_path, O_CLOEXEC);
if (entry_array_fd < 0) {
log_error("Failed to create entry array file: %m");
r = -errno;
goto fail;
}
unlink(entry_array_path);
#ifdef HAVE_GCRYPT
if ((le32toh(f->header->compatible_flags) & ~HEADER_COMPATIBLE_SEALED) != 0)
#else
if (f->header->compatible_flags != 0)
#endif
{
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) {
log_error("Reserved field in 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);
while (p != 0) {
if (show_progress)
draw_progress(0x7FFF * p / le64toh(f->header->tail_object_offset), &last_usec);
r = journal_file_move_to_object(f, -1, p, &o);
if (r < 0) {
log_error("Invalid object at %llu", (unsigned long long) p);
goto fail;
}
if (p > le64toh(f->header->tail_object_offset)) {
log_error("Invalid tail object pointer");
r = -EBADMSG;
goto fail;
}
if (p == le64toh(f->header->tail_object_offset))
found_last = true;
n_objects ++;
r = journal_file_object_verify(f, o);
if (r < 0) {
log_error("Invalid object contents at %llu", (unsigned long long) p);
goto fail;
}
if (o->object.flags & OBJECT_COMPRESSED &&
!(le32toh(f->header->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED)) {
log_error("Compressed object in file without compression at %llu", (unsigned long long) p);
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 ((le32toh(f->header->compatible_flags) & HEADER_COMPATIBLE_SEALED) && n_tags <= 0) {
log_error("First entry before first tag at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
r = write_uint64(entry_fd, p);
if (r < 0)
goto fail;
if (le64toh(o->entry.realtime) < last_tag_realtime) {
log_error("Older entry after newer tag at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
if (!entry_seqnum_set &&
le64toh(o->entry.seqnum) != le64toh(f->header->head_entry_seqnum)) {
log_error("Head entry sequence number incorrect at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
if (entry_seqnum_set &&
entry_seqnum >= le64toh(o->entry.seqnum)) {
log_error("Entry sequence number out of synchronization at %llu", (unsigned long long) p);
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)) {
log_error("Entry timestamp out of synchronization at %llu", (unsigned long long) p);
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)) {
log_error("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) {
log_error("More than one data hash table at %llu", (unsigned long long) p);
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)) {
log_error("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) {
log_error("More than one field hash table at %llu", (unsigned long long) p);
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)) {
log_error("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) {
log_error("More than one main entry array at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
found_main_entry_array = true;
}
n_entry_arrays++;
break;
case OBJECT_TAG: {
uint64_t q, rt;
if (!(le32toh(f->header->compatible_flags) & HEADER_COMPATIBLE_SEALED)) {
log_error("Tag object in file without sealing at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
if (le64toh(o->tag.seqnum) != n_tags + 1) {
log_error("Tag sequence number out of synchronization at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
if (le64toh(o->tag.epoch) < last_epoch) {
log_error("Epoch sequence out of synchronization at %llu", (unsigned long long) p);
r = -EBADMSG;
goto fail;
}
if (f->seal) {
log_debug("Checking tag %llu..", (unsigned long long) 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) {
log_error("Tag/entry realtime timestamp out of synchronization at %llu", (unsigned long long) p);
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, -1, q, &o);
if (r < 0)
goto fail;
r = journal_file_hmac_put_object(f, -1, 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, -1, p, &o);
if (r < 0)
goto fail;
if (memcmp(o->tag.tag, gcry_md_read(f->hmac, 0), TAG_LENGTH) != 0) {
log_error("Tag failed verification at %llu", (unsigned long long) p);
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));
last_epoch = le64toh(o->tag.epoch);
n_tags ++;
break;
}
default:
n_weird ++;
}
if (p == le64toh(f->header->tail_object_offset))
p = 0;
else
p = p + ALIGN64(le64toh(o->object.size));
}
if (!found_last) {
log_error("Tail object pointer dead");
r = -EBADMSG;
goto fail;
}
if (n_objects != le64toh(f->header->n_objects)) {
log_error("Object number mismatch");
r = -EBADMSG;
goto fail;
}
if (n_entries != le64toh(f->header->n_entries)) {
log_error("Entry number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_data) &&
n_data != le64toh(f->header->n_data)) {
log_error("Data number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_fields) &&
n_fields != le64toh(f->header->n_fields)) {
log_error("Field number mismatch");
r = -EBADMSG;
goto fail;
}
if (JOURNAL_HEADER_CONTAINS(f->header, n_tags) &&
n_tags != le64toh(f->header->n_tags)) {
log_error("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)) {
log_error("Entry array number mismatch");
r = -EBADMSG;
goto fail;
}
if (n_data_hash_tables != 1) {
log_error("Missing data hash table");
r = -EBADMSG;
goto fail;
}
if (n_field_hash_tables != 1) {
log_error("Missing field hash table");
r = -EBADMSG;
goto fail;
}
if (!found_main_entry_array) {
log_error("Missing entry array");
r = -EBADMSG;
goto fail;
}
if (entry_seqnum_set &&
entry_seqnum != le64toh(f->header->tail_entry_seqnum)) {
log_error("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))) {
log_error("Invalid tail monotonic timestamp");
r = -EBADMSG;
goto fail;
}
if (entry_realtime_set && entry_realtime != le64toh(f->header->tail_entry_realtime)) {
log_error("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);
close_nointr_nofail(data_fd);
close_nointr_nofail(entry_fd);
close_nointr_nofail(entry_array_fd);
if (first_validated)
*first_validated = last_tag_realtime ? le64toh(f->header->head_entry_realtime) : 0;
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:%llu (of %llu, %llu%%).",
f->path,
(unsigned long long) p,
(unsigned long long) f->last_stat.st_size,
(unsigned long long) (100 * p / f->last_stat.st_size));
if (data_fd >= 0) {
mmap_cache_close_fd(f->mmap, data_fd);
close_nointr_nofail(data_fd);
}
if (entry_fd >= 0) {
mmap_cache_close_fd(f->mmap, entry_fd);
close_nointr_nofail(entry_fd);
}
if (entry_array_fd >= 0) {
mmap_cache_close_fd(f->mmap, entry_array_fd);
close_nointr_nofail(entry_array_fd);
}
return r;
}