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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 <openssl/evp.h>
#include <string.h>
#include "api/s2n.h"
#include "crypto/s2n_cipher.h"
#include "crypto/s2n_hash.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_record.h"
#include "utils/s2n_random.h"
/* Explicit IV starts after the TLS record header. */
#define EXPLICIT_IV_OFFSET S2N_TLS_RECORD_HEADER_LENGTH
/* IVs should never be repeated with the same session key. */
static int ensure_explicit_iv_is_unique(uint8_t existing_explicit_ivs[S2N_DEFAULT_FRAGMENT_LENGTH][S2N_TLS_MAX_IV_LEN],
size_t num_existing_ivs,
const uint8_t *candidate_iv,
uint16_t iv_len)
{
for (size_t i = 0; i < num_existing_ivs; i++) {
if (memcmp(existing_explicit_ivs[i], candidate_iv, iv_len) == 0) {
return S2N_FAILURE;
}
}
return S2N_SUCCESS;
}
int main(int argc, char **argv)
{
struct s2n_connection *conn = NULL;
uint8_t random_data[S2N_DEFAULT_FRAGMENT_LENGTH + 1];
uint8_t mac_key_sha[20] = "server key shaserve";
uint8_t mac_key_sha256[32] = "server key sha256server key sha";
uint8_t aes128_key[] = "123456789012345";
uint8_t aes256_key[] = "1234567890123456789012345678901";
struct s2n_blob aes128 = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&aes128, aes128_key, sizeof(aes128_key)));
struct s2n_blob aes256 = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&aes256, aes256_key, sizeof(aes256_key)));
struct s2n_blob r = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&r, random_data, sizeof(random_data)));
/* Stores explicit IVs used in each test case to validate uniqueness. */
uint8_t existing_explicit_ivs[S2N_DEFAULT_FRAGMENT_LENGTH + 2][S2N_TLS_MAX_IV_LEN];
BEGIN_TEST();
EXPECT_SUCCESS(s2n_disable_tls13_in_test());
/* Skip test if we can't use the ciphers */
if (!s2n_aes128_sha.is_available()
|| !s2n_aes256_sha.is_available()
|| !s2n_aes128_sha256.is_available()
|| !s2n_aes256_sha256.is_available()) {
END_TEST();
}
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_OK(s2n_get_public_random_data(&r));
/* Peer and we are in sync */
conn->server = conn->initial;
conn->client = conn->initial;
const int max_aligned_fragment = S2N_DEFAULT_FRAGMENT_LENGTH;
const uint8_t proto_versions[3] = { S2N_TLS10, S2N_TLS11, S2N_TLS12 };
/* test the composite AES128_SHA1 cipher */
conn->initial->cipher_suite->record_alg = &s2n_record_alg_aes128_sha_composite;
/* It's important to verify all TLS versions for the composite implementation.
* There are a few gotchas with respect to explicit IV length and payload length
*/
for (int j = 0; j < 3; j++) {
for (size_t i = 0; i <= max_aligned_fragment + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_encryption_key(&conn->initial->server_key, &aes128));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_decryption_key(&conn->initial->client_key, &aes128));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->server_key, mac_key_sha, sizeof(mac_key_sha)));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->client_key, mac_key_sha, sizeof(mac_key_sha)));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
conn->actual_protocol_version = proto_versions[j];
int explicit_iv_len = 0;
if (conn->actual_protocol_version > S2N_TLS10) {
explicit_iv_len = 16;
} else {
explicit_iv_len = 0;
}
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= max_aligned_fragment) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = max_aligned_fragment;
}
uint16_t predicted_length = bytes_written + 1 + SHA_DIGEST_LENGTH + explicit_iv_len;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
uint8_t record_version = conn->out.blob.data[1] * 10 + conn->out.blob.data[2];
EXPECT_EQUAL(record_version, conn->actual_protocol_version);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
/* The data should be encrypted */
if (bytes_written > 10) {
EXPECT_NOT_EQUAL(memcmp(conn->out.blob.data + EXPLICIT_IV_OFFSET + explicit_iv_len, random_data, bytes_written), 0);
}
if (explicit_iv_len > 0) {
/* The explicit IV for every record written should be random */
uint8_t *explicit_iv = conn->out.blob.data + EXPLICIT_IV_OFFSET;
EXPECT_SUCCESS(ensure_explicit_iv_is_unique(existing_explicit_ivs, i, explicit_iv, explicit_iv_len));
/* Record this IV */
EXPECT_MEMCPY_SUCCESS(existing_explicit_ivs[i], explicit_iv, explicit_iv_len);
}
/* Copy the encrypted out data to the in data */
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, S2N_TLS_RECORD_HEADER_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
/* Let's decrypt it */
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);
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
}
}
/* test the composite AES256_SHA1 cipher */
conn->initial->cipher_suite->record_alg = &s2n_record_alg_aes256_sha_composite;
for (int j = 0; j < 3; j++) {
for (int i = 0; i <= max_aligned_fragment + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_encryption_key(&conn->initial->server_key, &aes256));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_decryption_key(&conn->initial->client_key, &aes256));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->server_key, mac_key_sha, sizeof(mac_key_sha)));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->client_key, mac_key_sha, sizeof(mac_key_sha)));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
conn->actual_protocol_version = proto_versions[j];
int explicit_iv_len = 0;
if (conn->actual_protocol_version > S2N_TLS10) {
explicit_iv_len = 16;
} else {
explicit_iv_len = 0;
}
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= max_aligned_fragment) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = max_aligned_fragment;
}
uint16_t predicted_length = bytes_written + 1 + SHA_DIGEST_LENGTH + explicit_iv_len;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
uint8_t record_version = conn->out.blob.data[1] * 10 + conn->out.blob.data[2];
EXPECT_EQUAL(record_version, conn->actual_protocol_version);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
/* The data should be encrypted */
if (bytes_written > 10) {
EXPECT_NOT_EQUAL(memcmp(conn->out.blob.data + EXPLICIT_IV_OFFSET + explicit_iv_len, random_data, bytes_written), 0);
}
if (explicit_iv_len > 0) {
/* The explicit IV for every record written should be random */
uint8_t *explicit_iv = conn->out.blob.data + EXPLICIT_IV_OFFSET;
EXPECT_SUCCESS(ensure_explicit_iv_is_unique(existing_explicit_ivs, i, explicit_iv, explicit_iv_len));
/* Record this IV */
EXPECT_MEMCPY_SUCCESS(existing_explicit_ivs[i], explicit_iv, explicit_iv_len);
}
/* Copy the encrypted out data to the in data */
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, S2N_TLS_RECORD_HEADER_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
/* Let's decrypt it */
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);
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
}
}
/* test the composite AES128_SHA256 cipher */
conn->initial->cipher_suite->record_alg = &s2n_record_alg_aes128_sha256_composite;
for (int j = 0; j < 3; j++) {
for (int i = 0; i < max_aligned_fragment + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_encryption_key(&conn->initial->server_key, &aes128));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_decryption_key(&conn->initial->client_key, &aes128));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->server_key, mac_key_sha256, sizeof(mac_key_sha256)));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->client_key, mac_key_sha256, sizeof(mac_key_sha256)));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
conn->actual_protocol_version = proto_versions[j];
int explicit_iv_len = 0;
if (conn->actual_protocol_version > S2N_TLS10) {
explicit_iv_len = 16;
} else {
explicit_iv_len = 0;
}
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= max_aligned_fragment) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = max_aligned_fragment;
}
uint16_t predicted_length = bytes_written + 1 + SHA256_DIGEST_LENGTH + explicit_iv_len;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
uint8_t record_version = conn->out.blob.data[1] * 10 + conn->out.blob.data[2];
EXPECT_EQUAL(record_version, conn->actual_protocol_version);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
/* The data should be encrypted */
if (bytes_written > 10) {
EXPECT_NOT_EQUAL(memcmp(conn->out.blob.data + EXPLICIT_IV_OFFSET + explicit_iv_len, random_data, bytes_written), 0);
}
if (explicit_iv_len > 0) {
/* The explicit IV for every record written should be random */
uint8_t *explicit_iv = conn->out.blob.data + EXPLICIT_IV_OFFSET;
EXPECT_SUCCESS(ensure_explicit_iv_is_unique(existing_explicit_ivs, i, explicit_iv, explicit_iv_len));
/* Record this IV */
EXPECT_MEMCPY_SUCCESS(existing_explicit_ivs[i], explicit_iv, explicit_iv_len);
}
/* Copy the encrypted out data to the in data */
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, S2N_TLS_RECORD_HEADER_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
/* Let's decrypt it */
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);
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
}
}
/* test the composite AES256_SHA256 cipher */
conn->initial->cipher_suite->record_alg = &s2n_record_alg_aes256_sha256_composite;
for (int j = 0; j < 3; j++) {
for (int i = 0; i <= max_aligned_fragment + 1; i++) {
struct s2n_blob in = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&in, random_data, i));
int bytes_written = 0;
EXPECT_SUCCESS(s2n_connection_wipe(conn));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_encryption_key(&conn->initial->server_key, &aes256));
EXPECT_OK(conn->initial->cipher_suite->record_alg->cipher->set_decryption_key(&conn->initial->client_key, &aes256));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->server_key, mac_key_sha256, sizeof(mac_key_sha256)));
EXPECT_SUCCESS(conn->initial->cipher_suite->record_alg->cipher->io.comp.set_mac_write_key(&conn->initial->client_key, mac_key_sha256, sizeof(mac_key_sha256)));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->out));
conn->actual_protocol_version = proto_versions[j];
int explicit_iv_len = 0;
if (conn->actual_protocol_version > S2N_TLS10) {
explicit_iv_len = 16;
} else {
explicit_iv_len = 0;
}
s2n_result result = s2n_record_write(conn, TLS_APPLICATION_DATA, &in);
if (i <= max_aligned_fragment) {
EXPECT_OK(result);
bytes_written = i;
} else {
EXPECT_ERROR_WITH_ERRNO(result, S2N_ERR_FRAGMENT_LENGTH_TOO_LARGE);
bytes_written = max_aligned_fragment;
}
uint16_t predicted_length = bytes_written + 1 + SHA256_DIGEST_LENGTH + explicit_iv_len;
if (predicted_length % 16) {
predicted_length += (16 - (predicted_length % 16));
}
EXPECT_EQUAL(conn->out.blob.data[0], TLS_APPLICATION_DATA);
uint8_t record_version = conn->out.blob.data[1] * 10 + conn->out.blob.data[2];
EXPECT_EQUAL(record_version, conn->actual_protocol_version);
EXPECT_EQUAL(conn->out.blob.data[3], (predicted_length >> 8) & 0xff);
EXPECT_EQUAL(conn->out.blob.data[4], predicted_length & 0xff);
/* The data should be encrypted */
if (bytes_written > 10) {
EXPECT_NOT_EQUAL(memcmp(conn->out.blob.data + EXPLICIT_IV_OFFSET + explicit_iv_len, random_data, bytes_written), 0);
}
if (explicit_iv_len > 0) {
/* The explicit IV for every record written should be random */
uint8_t *explicit_iv = conn->out.blob.data + EXPLICIT_IV_OFFSET;
EXPECT_SUCCESS(ensure_explicit_iv_is_unique(existing_explicit_ivs, i, explicit_iv, explicit_iv_len));
/* Record this IV */
EXPECT_MEMCPY_SUCCESS(existing_explicit_ivs[i], explicit_iv, explicit_iv_len);
}
/* Copy the encrypted out data to the in data */
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, S2N_TLS_RECORD_HEADER_LENGTH));
EXPECT_SUCCESS(s2n_stuffer_copy(&conn->out, &conn->in, s2n_stuffer_data_available(&conn->out)));
/* Let's decrypt it */
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);
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->header_in));
EXPECT_SUCCESS(s2n_stuffer_wipe(&conn->in));
}
}
EXPECT_SUCCESS(s2n_connection_free(conn));
END_TEST();
}
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