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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/s2n_record.h"
#include <stdio.h>
#include <string.h>
#include "api/s2n.h"
#include "crypto/s2n_cipher.h"
#include "crypto/s2n_hmac.h"
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_kex.h"
#include "tls/s2n_prf.h"
#include "utils/s2n_random.h"
/* Mock block cipher that does nothing */
int mock_block_endecrypt(struct s2n_session_key *key, struct s2n_blob *iv, struct s2n_blob *in, struct s2n_blob *out)
{
return 0;
}
struct s2n_cipher mock_block_cipher = {
.type = S2N_CBC,
.key_material_size = 0,
.io.cbc = {
.block_size = 16,
.record_iv_size = 16,
.encrypt = mock_block_endecrypt,
.decrypt = mock_block_endecrypt },
.set_encryption_key = NULL,
.set_decryption_key = NULL,
.destroy_key = NULL,
};
struct s2n_record_algorithm mock_block_record_alg = {
.cipher = &mock_block_cipher,
.hmac_alg = S2N_HMAC_SHA1,
};
struct s2n_cipher_suite mock_block_cipher_suite = {
.available = 1,
.name = "TLS_MOCK_CBC",
.iana_value = { 0x12, 0x34 },
.key_exchange_alg = &s2n_rsa,
.record_alg = &mock_block_record_alg,
};
struct s2n_record_algorithm mock_null_sha1_record_alg = {
.cipher = &s2n_null_cipher,
.hmac_alg = S2N_HMAC_SHA1,
};
int main(int argc, char **argv)
{
struct s2n_connection *conn = NULL;
uint8_t mac_key[] = "sample mac key";
struct s2n_blob fixed_iv = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&fixed_iv, mac_key, sizeof(mac_key)));
struct s2n_hmac_state check_mac;
uint8_t random_data[S2N_DEFAULT_FRAGMENT_LENGTH + 1];
struct s2n_blob r = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&r, random_data, sizeof(random_data)));
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
EXPECT_SUCCESS(s2n_hmac_new(&check_mac));
EXPECT_SUCCESS(s2n_hmac_init(&check_mac, S2N_HMAC_SHA1, fixed_iv.data, fixed_iv.size));
EXPECT_OK(s2n_get_public_random_data(&r));
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
/* Peer and we are in sync */
conn->server = conn->initial;
conn->client = conn->initial;
/* test the null cipher. */
conn->initial->cipher_suite = &s2n_null_cipher_suite;
conn->actual_protocol_version = S2N_TLS11;
for (size_t i = 0; i <= S2N_DEFAULT_FRAGMENT_LENGTH + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
s2n_result result = s2n_record_write(conn, TLS_ALERT, &in);
if (i <= S2N_DEFAULT_FRAGMENT_LENGTH) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = S2N_DEFAULT_FRAGMENT_LENGTH;
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_ALERT);
EXPECT_EQUAL(conn->out.blob.data[1], 3);
EXPECT_EQUAL(conn->out.blob.data[2], 2);
EXPECT_EQUAL(conn->out.blob.data[3], (bytes_written >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], bytes_written & 0xff);
EXPECT_EQUAL(memcmp(conn->out.blob.data + 5, random_data, bytes_written), 0);
EXPECT_SUCCESS(s2n_stuffer_resize_if_empty(&conn->in, S2N_LARGE_FRAGMENT_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
uint8_t content_type = 0;
uint16_t fragment_length = 0;
EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
EXPECT_SUCCESS(s2n_record_parse(conn));
EXPECT_EQUAL(content_type, TLS_ALERT);
EXPECT_EQUAL(fragment_length, bytes_written);
}
/* test a fake streaming cipher with a MAC */
conn->initial->cipher_suite->record_alg = &mock_null_sha1_record_alg;
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->client_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->server_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
conn->initial->cipher_suite = &s2n_null_cipher_suite;
conn->actual_protocol_version = S2N_TLS11;
for (size_t i = 0; i <= S2N_DEFAULT_FRAGMENT_LENGTH + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_hmac_reset(&check_mac));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->initial->server_sequence_number, 8));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
s2n_result result = s2n_record_write(conn, TLS_ALERT, &in);
if (i <= S2N_DEFAULT_FRAGMENT_LENGTH) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = S2N_DEFAULT_FRAGMENT_LENGTH;
}
uint16_t predicted_length = bytes_written + 20;
EXPECT_EQUAL(conn->out.blob.data[0], TLS_ALERT);
EXPECT_EQUAL(conn->out.blob.data[1], 3);
EXPECT_EQUAL(conn->out.blob.data[2], 2);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
EXPECT_EQUAL(memcmp(conn->out.blob.data + 5, random_data, bytes_written), 0);
uint8_t top = bytes_written >> 8;
uint8_t bot = bytes_written & 0xff;
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->out.blob.data, 3));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &top, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &bot, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, random_data, bytes_written));
uint8_t check_digest[20];
EXPECT_SUCCESS(s2n_hmac_digest(&check_mac, check_digest, 20));
EXPECT_SUCCESS(s2n_hmac_digest_verify(conn->out.blob.data + 5 + bytes_written, check_digest, 20));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
uint8_t original_seq_num[8];
EXPECT_MEMCPY_SUCCESS(original_seq_num, conn->server->client_sequence_number, 8);
uint8_t content_type = 0;
uint16_t fragment_length = 0;
EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
EXPECT_SUCCESS(s2n_record_parse(conn));
EXPECT_EQUAL(content_type, TLS_ALERT);
EXPECT_EQUAL(fragment_length, predicted_length);
/* Simulate a replay attack and verify that replaying the same record
* fails due to the sequence number check */
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->out));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
EXPECT_FAILURE(s2n_record_parse(conn));
/* Restore the original sequence number */
EXPECT_MEMCPY_SUCCESS(conn->server->client_sequence_number, original_seq_num, 8);
/* Deliberately corrupt a byte of the output and check that the record
* won't parse
*/
uint64_t byte_to_corrupt = 0;
EXPECT_OK(s2n_public_random(fragment_length, &byte_to_corrupt));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->out));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
conn->in.blob.data[byte_to_corrupt] += 1;
EXPECT_FAILURE_WITH_ERRNO(s2n_record_parse(conn), S2N_ERR_BAD_MESSAGE);
}
/* Test a mock block cipher with a mac - in TLS1.0 mode */
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->client_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->server_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
conn->actual_protocol_version = S2N_TLS10;
conn->initial->cipher_suite = &mock_block_cipher_suite;
for (size_t i = 0; i <= S2N_DEFAULT_FRAGMENT_LENGTH + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_hmac_reset(&check_mac));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->initial->client_sequence_number, 8));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= S2N_DEFAULT_FRAGMENT_LENGTH) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = S2N_DEFAULT_FRAGMENT_LENGTH;
}
uint16_t predicted_length = bytes_written + 1 + 20;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
EXPECT_EQUAL(conn->out.blob.data[1], 3);
EXPECT_EQUAL(conn->out.blob.data[2], 1);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
EXPECT_EQUAL(memcmp(conn->out.blob.data + 5, random_data, bytes_written), 0);
/* The last byte of out should indicate how much padding there was */
uint8_t p = conn->out.blob.data[conn->out.write_cursor - 1];
const uint32_t remaining = 5 + bytes_written + 20 + p + 1;
EXPECT_EQUAL(remaining, s2n_stuffer_data_available(&conn->out));
/* Check that the last 'p' bytes are all set to 'p' */
for (size_t j = 0; j <= (size_t) p; j++) {
EXPECT_EQUAL(conn->out.blob.data[5 + bytes_written + 20 + j], p);
}
uint8_t top = bytes_written >> 8;
uint8_t bot = bytes_written & 0xff;
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->out.blob.data, 3));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &top, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &bot, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, random_data, bytes_written));
uint8_t check_digest[20];
EXPECT_SUCCESS(s2n_hmac_digest(&check_mac, check_digest, 20));
EXPECT_SUCCESS(s2n_hmac_digest_verify(conn->out.blob.data + 5 + bytes_written, check_digest, 20));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
uint8_t content_type = 0;
uint16_t fragment_length = 0;
EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
EXPECT_SUCCESS(s2n_record_parse(conn));
EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
EXPECT_EQUAL(fragment_length, predicted_length);
}
/* Test a mock block cipher with a mac - in TLS1.1+ mode */
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->client_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
EXPECT_SUCCESS(s2n_hmac_init(&conn->initial->server_record_mac, S2N_HMAC_SHA1, mac_key, sizeof(mac_key)));
conn->actual_protocol_version = S2N_TLS11;
conn->initial->cipher_suite = &mock_block_cipher_suite;
for (int i = 0; i <= S2N_DEFAULT_FRAGMENT_LENGTH + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_hmac_reset(&check_mac));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->initial->client_sequence_number, 8));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= S2N_DEFAULT_FRAGMENT_LENGTH) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = S2N_DEFAULT_FRAGMENT_LENGTH;
}
uint16_t predicted_length = bytes_written + 1 + 20 + 16;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
EXPECT_EQUAL(conn->out.blob.data[1], 3);
EXPECT_EQUAL(conn->out.blob.data[2], 2);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
EXPECT_EQUAL(memcmp(conn->out.blob.data + 16 + 5, random_data, bytes_written), 0);
/* The last byte of out should indicate how much padding there was */
uint8_t p = conn->out.blob.data[conn->out.write_cursor - 1];
EXPECT_EQUAL(5 + bytes_written + 20 + 16 + p + 1, s2n_stuffer_data_available(&conn->out));
/* Check that the last 'p' bytes are all set to 'p' */
for (size_t j = 0; j <= (size_t) p; j++) {
EXPECT_EQUAL(conn->out.blob.data[5 + bytes_written + 16 + 20 + j], p);
}
uint8_t top = bytes_written >> 8;
uint8_t bot = bytes_written & 0xff;
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, conn->out.blob.data, 3));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &top, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, &bot, 1));
EXPECT_SUCCESS(s2n_hmac_update(&check_mac, random_data, bytes_written));
uint8_t check_digest[20];
EXPECT_SUCCESS(s2n_hmac_digest(&check_mac, check_digest, 20));
EXPECT_SUCCESS(s2n_hmac_digest_verify(conn->out.blob.data + 16 + 5 + bytes_written, check_digest, 20));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
uint8_t content_type = 0;
uint16_t fragment_length = 0;
EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
EXPECT_SUCCESS(s2n_record_parse(conn));
EXPECT_EQUAL(content_type, TLS_APPLICATION_DATA);
EXPECT_EQUAL(fragment_length, predicted_length);
}
/* Test TLS record limit */
struct s2n_blob empty_blob = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&empty_blob, NULL, 0));
conn->initial->cipher_suite = &s2n_null_cipher_suite;
/* Fast forward the sequence number */
uint8_t max_num_records[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
EXPECT_MEMCPY_SUCCESS(conn->initial->server_sequence_number, max_num_records, sizeof(max_num_records));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
/* Sequence number should wrap around */
EXPECT_ERROR_WITH_ERRNO(s2n_record_write(conn, TLS_ALERT, &empty_blob), S2N_ERR_RECORD_LIMIT);
/* Test TLS 1.3 Record should reflect as TLS 1.2 version on the wire */
{
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_record_write(conn, TLS_ALERT, &empty_blob));
/* Make sure that TLS 1.3 records appear as TLS 1.2 version */
EXPECT_EQUAL(conn->out.blob.data[1], 3);
EXPECT_EQUAL(conn->out.blob.data[2], 3);
/* Copy written bytes for reading */
EXPECT_SUCCESS(s2n_stuffer_resize_if_empty(&conn->in, S2N_LARGE_FRAGMENT_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->header_in, 5));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
/* Trigger condition to check for protocol version */
conn->actual_protocol_version_established = 1;
uint8_t content_type = 0;
uint16_t fragment_length = 0;
EXPECT_SUCCESS(s2n_record_header_parse(conn, &content_type, &fragment_length));
/* If record version on wire is TLS 1.3, check s2n_record_header_parse fails */
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->header_in));
conn->header_in.blob.data[1] = 3;
conn->header_in.blob.data[2] = 4;
EXPECT_FAILURE_WITH_ERRNO(s2n_record_header_parse(conn, &content_type, &fragment_length), S2N_ERR_BAD_MESSAGE);
};
/* Test: ApplicationData MUST be encrypted */
{
EXPECT_SUCCESS(s2n_connection_wipe(conn));
conn->actual_protocol_version = S2N_TLS13;
/* Write fails with no secrets / cipher set */
EXPECT_ERROR_WITH_ERRNO(s2n_record_write(conn, TLS_APPLICATION_DATA, &empty_blob), S2N_ERR_ENCRYPT);
/* Read fails with no secrets / cipher set */
uint8_t header_bytes[] = { TLS_APPLICATION_DATA, 0x03, 0x04, 0x00, 0x00 };
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&conn->header_in, header_bytes, sizeof(header_bytes)));
EXPECT_FAILURE_WITH_ERRNO(s2n_record_parse(conn), S2N_ERR_DECRYPT);
};
/* Record version is recorded for the first message received (Client Hello) */
{
DEFER_CLEANUP(struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
uint8_t content_type = 0;
uint16_t fragment_length = 0;
uint8_t header[5] = { 0x16, /* Record type */
0x03, 0x01, /* Protocol version: TLS10 */
0x00, 0x00 }; /* Record size */
uint8_t altered_header[5] = { 0x16, /* Record type */
0x03, 0x03, /* Protocol version: TLS12 */
0x00, 0x00 }; /* Record size */
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&server_conn->header_in, header, sizeof(header)));
EXPECT_SUCCESS(s2n_record_header_parse(server_conn, &content_type, &fragment_length));
/* Record TLS version is retrieved as written in the header */
EXPECT_EQUAL(server_conn->client_hello.legacy_record_version, S2N_TLS10);
EXPECT_SUCCESS(s2n_stuffer_wipe(&server_conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&server_conn->header_in, altered_header, sizeof(header)));
EXPECT_SUCCESS(s2n_record_header_parse(server_conn, &content_type, &fragment_length));
/* Record TLS version is unchanged even though a different TLS version was in the record header */
EXPECT_EQUAL(server_conn->client_hello.legacy_record_version, S2N_TLS10);
}
EXPECT_SUCCESS(s2n_hmac_free(&check_mac));
EXPECT_SUCCESS(s2n_connection_free(conn));
END_TEST();
}
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