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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_tls13_secrets.h"
#include <sys/param.h>
#include "crypto/s2n_ecc_evp.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
S2N_RESULT s2n_tls13_extract_secret(struct s2n_connection *conn, s2n_extract_secret_type_t secret_type);
S2N_RESULT s2n_tls13_derive_secret(struct s2n_connection *conn, s2n_extract_secret_type_t secret_type,
s2n_mode mode, struct s2n_blob *secret);
static S2N_RESULT s2n_set_test_key_shares(struct s2n_connection *conn, const struct s2n_ecc_named_curve *curve)
{
conn->kex_params.server_ecc_evp_params.negotiated_curve = curve;
RESULT_GUARD_POSIX(s2n_ecc_evp_generate_ephemeral_key(&conn->kex_params.server_ecc_evp_params));
conn->kex_params.client_ecc_evp_params.negotiated_curve = curve;
RESULT_GUARD_POSIX(s2n_ecc_evp_generate_ephemeral_key(&conn->kex_params.client_ecc_evp_params));
return S2N_RESULT_OK;
}
struct s2n_tls13_secrets_test_case {
s2n_extract_secret_type_t curr_secret_type;
s2n_extract_secret_type_t next_secret_type;
s2n_mode secret_mode;
s2n_mode conn_mode;
struct s2n_cipher_suite *cipher_suite;
const struct s2n_ecc_named_curve *curve;
};
int main(int argc, char **argv)
{
BEGIN_TEST();
const uint8_t empty_secret[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
const struct s2n_cipher_preferences *ciphers = &cipher_preferences_test_all_tls13;
const struct s2n_ecc_preferences *curves = &s2n_ecc_preferences_test_all;
const s2n_mode modes[] = { S2N_CLIENT, S2N_SERVER };
struct s2n_blob test_secret = { 0 };
uint8_t test_secret_bytes[S2N_TLS13_SECRET_MAX_LEN] = "hello world";
EXPECT_SUCCESS(s2n_blob_init(&test_secret, test_secret_bytes, sizeof(test_secret_bytes)));
struct s2n_tls13_secrets_test_case test_cases[1000] = { 0 };
size_t test_cases_count = 0;
for (s2n_extract_secret_type_t next_type = S2N_EARLY_SECRET; next_type <= S2N_MASTER_SECRET; next_type++) {
for (s2n_extract_secret_type_t curr_type = S2N_NONE_SECRET; curr_type <= S2N_MASTER_SECRET; curr_type++) {
for (size_t cipher_i = 0; cipher_i < ciphers->count; cipher_i++) {
for (size_t curve_i = 0; curve_i < curves->count; curve_i++) {
for (size_t m1_i = 0; m1_i < s2n_array_len(modes); m1_i++) {
for (size_t m2_i = 0; m2_i < s2n_array_len(modes); m2_i++) {
if (curr_type > next_type) {
/* Secret schedule MUST be evaluated in order */
continue;
}
test_cases[test_cases_count] = (struct s2n_tls13_secrets_test_case){
.curr_secret_type = curr_type,
.next_secret_type = next_type,
.secret_mode = modes[m1_i],
.conn_mode = modes[m2_i],
.cipher_suite = ciphers->suites[cipher_i],
.curve = curves->ecc_curves[curve_i],
};
test_cases_count++;
}
}
}
}
}
}
EXPECT_TRUE(test_cases_count > 0);
/* Test: s2n_tls13_extract_secret */
{
/* Safety */
{
struct s2n_connection empty_conn = { 0 };
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_extract_secret(NULL, S2N_EARLY_SECRET), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_extract_secret(&empty_conn, S2N_EARLY_SECRET), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_extract_secret(conn, -1), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_extract_secret(conn, 255), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_extract_secret(conn, (S2N_MASTER_SECRET + 1)), S2N_ERR_SAFETY);
};
/* No-op if secret already exists */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->secrets.extract_secret_type = S2N_EARLY_SECRET;
EXPECT_OK(s2n_tls13_extract_secret(conn, S2N_EARLY_SECRET));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_EARLY_SECRET);
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
};
/* Generate all secrets sequentially */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->secrets.extract_secret_type = S2N_NONE_SECRET;
EXPECT_OK(s2n_tls13_extract_secret(conn, S2N_EARLY_SECRET));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_EARLY_SECRET);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
EXPECT_OK(s2n_set_test_key_shares(conn, &s2n_ecc_curve_secp256r1));
EXPECT_OK(s2n_tls13_extract_secret(conn, S2N_HANDSHAKE_SECRET));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_HANDSHAKE_SECRET);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
EXPECT_OK(s2n_tls13_extract_secret(conn, S2N_MASTER_SECRET));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_MASTER_SECRET);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
};
/* Generate all secrets at once (backfill) */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->secrets.extract_secret_type = S2N_NONE_SECRET;
EXPECT_OK(s2n_set_test_key_shares(conn, &s2n_ecc_curve_secp256r1));
EXPECT_OK(s2n_tls13_extract_secret(conn, S2N_MASTER_SECRET));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_MASTER_SECRET);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
}
/* All valid parameter combinations should succeed */
for (size_t i = 0; i < test_cases_count; i++) {
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(test_cases[i].conn_mode),
s2n_connection_ptr_free);
conn->secure->cipher_suite = test_cases[i].cipher_suite;
conn->secrets.extract_secret_type = test_cases[i].curr_secret_type;
EXPECT_OK(s2n_set_test_key_shares(conn, test_cases[i].curve));
EXPECT_OK(s2n_tls13_extract_secret(conn, test_cases[i].next_secret_type));
}
};
/* Test: s2n_tls13_derive_secret */
{
const uint32_t handshake_type = NEGOTIATED | FULL_HANDSHAKE;
const int message_nums[] = {
[S2N_EARLY_SECRET] = 0,
[S2N_HANDSHAKE_SECRET] = 1,
[S2N_MASTER_SECRET] = 5,
};
/* Safety */
{
struct s2n_blob blob = { 0 };
struct s2n_connection empty_conn = { 0 };
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(NULL, S2N_EARLY_SECRET, S2N_CLIENT, &blob), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(&empty_conn, S2N_EARLY_SECRET, S2N_CLIENT, &blob), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(conn, -1, S2N_CLIENT, &blob), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(conn, 255, S2N_CLIENT, &blob), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(conn, S2N_EARLY_SECRET, S2N_CLIENT, NULL), S2N_ERR_NULL);
};
/* Generates a secret */
{
uint8_t output_bytes[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
struct s2n_blob output = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&output, output_bytes, sizeof(output_bytes)));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->secrets.extract_secret_type = S2N_NONE_SECRET;
EXPECT_OK(s2n_tls13_derive_secret(conn, S2N_EARLY_SECRET, S2N_SERVER, &output));
EXPECT_BYTEARRAY_NOT_EQUAL(output.data, empty_secret, sizeof(empty_secret));
};
/* Fails if correct transcript digest not available */
{
uint8_t output_bytes[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
struct s2n_blob output = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&output, output_bytes, sizeof(output_bytes)));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->handshake.handshake_type = handshake_type;
EXPECT_OK(s2n_set_test_key_shares(conn, &s2n_ecc_curve_secp256r1));
/* Fails with incorrect transcript */
conn->handshake.message_number = message_nums[S2N_HANDSHAKE_SECRET];
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_derive_secret(conn, S2N_MASTER_SECRET, S2N_SERVER, &output),
S2N_ERR_SECRET_SCHEDULE_STATE);
/* Succeeds with correct transcript */
conn->handshake.message_number = message_nums[S2N_MASTER_SECRET];
EXPECT_OK(s2n_tls13_derive_secret(conn, S2N_MASTER_SECRET, S2N_SERVER, &output));
};
/* Calculates previous extract secrets if necessary */
{
uint8_t output_bytes[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
struct s2n_blob output = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&output, output_bytes, sizeof(output_bytes)));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
conn->actual_protocol_version = S2N_TLS13;
conn->handshake.handshake_type = handshake_type;
conn->handshake.message_number = message_nums[S2N_HANDSHAKE_SECRET];
EXPECT_OK(s2n_set_test_key_shares(conn, &s2n_ecc_curve_secp256r1));
conn->secrets.extract_secret_type = S2N_NONE_SECRET;
EXPECT_OK(s2n_tls13_derive_secret(conn, S2N_HANDSHAKE_SECRET, S2N_SERVER, &output));
EXPECT_EQUAL(conn->secrets.extract_secret_type, S2N_HANDSHAKE_SECRET);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(output.data, empty_secret, sizeof(empty_secret));
};
/* All valid parameter combinations should succeed */
for (size_t i = 0; i < test_cases_count; i++) {
uint8_t output_bytes[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
struct s2n_blob output = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&output, output_bytes, sizeof(output_bytes)));
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(test_cases[i].conn_mode),
s2n_connection_ptr_free);
conn->secure->cipher_suite = test_cases[i].cipher_suite;
conn->secrets.extract_secret_type = test_cases[i].curr_secret_type;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
conn->actual_protocol_version = S2N_TLS13;
conn->handshake.handshake_type = handshake_type;
conn->handshake.message_number = message_nums[test_cases[i].next_secret_type];
EXPECT_OK(s2n_set_test_key_shares(conn, test_cases[i].curve));
EXPECT_OK(s2n_tls13_derive_secret(conn, test_cases[i].next_secret_type, test_cases[i].secret_mode, &output));
EXPECT_BYTEARRAY_NOT_EQUAL(output.data, empty_secret, sizeof(empty_secret));
}
};
/* s2n_tls13_secrets_clean */
{
/* Safety */
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_clean(NULL), S2N_ERR_NULL);
/* Wipes all secrets */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.extract_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.client_early_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.client_handshake_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.server_handshake_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.client_app_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.server_app_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.exporter_master_secret, test_secret.data, test_secret.size);
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.resumption_master_secret, test_secret.data, test_secret.size);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_early_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_handshake_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.server_handshake_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_app_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.server_app_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.exporter_master_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.resumption_master_secret, empty_secret, sizeof(empty_secret));
EXPECT_OK(s2n_tls13_secrets_clean(conn));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.extract_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_early_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_handshake_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.server_handshake_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_app_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.server_app_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.exporter_master_secret, empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.resumption_master_secret, empty_secret, sizeof(empty_secret));
};
};
/* Test s2n_tls13_secrets_get */
{
/* Safety */
{
struct s2n_blob result = { 0 };
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(NULL, S2N_HANDSHAKE_SECRET, S2N_CLIENT, &result), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_HANDSHAKE_SECRET, S2N_CLIENT, NULL), S2N_ERR_NULL);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_NONE_SECRET, S2N_CLIENT, &result), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, -1, S2N_CLIENT, &result), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, 100, S2N_CLIENT, &result), S2N_ERR_SAFETY);
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_EARLY_SECRET, S2N_SERVER, &result), S2N_ERR_SAFETY);
conn->secrets.extract_secret_type = S2N_NONE_SECRET;
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_HANDSHAKE_SECRET, S2N_CLIENT, &result), S2N_ERR_SAFETY);
struct s2n_crypto_parameters *secure = conn->secure;
conn->secure = NULL;
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_HANDSHAKE_SECRET, S2N_CLIENT, &result), S2N_ERR_NULL);
conn->secure = secure;
struct s2n_cipher_suite *cipher_suite = conn->secure->cipher_suite;
conn->secure->cipher_suite = NULL;
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_get(conn, S2N_HANDSHAKE_SECRET, S2N_CLIENT, &result), S2N_ERR_NULL);
conn->secure->cipher_suite = cipher_suite;
};
/* Retrieves a secret */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.client_handshake_secret,
test_secret.data, test_secret.size);
conn->secrets.extract_secret_type = S2N_HANDSHAKE_SECRET;
struct s2n_blob result = { 0 };
uint8_t result_bytes[S2N_TLS13_SECRET_MAX_LEN] = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&result, result_bytes, sizeof(result_bytes)));
EXPECT_OK(s2n_tls13_secrets_get(conn, S2N_HANDSHAKE_SECRET, S2N_CLIENT, &result));
EXPECT_TRUE(result.size > 0);
EXPECT_TRUE(result.size <= S2N_TLS13_SECRET_MAX_LEN);
EXPECT_BYTEARRAY_EQUAL(result.data, test_secret.data, result.size);
};
};
/* s2n_tls13_secrets_update */
{
/* Safety */
EXPECT_ERROR_WITH_ERRNO(s2n_tls13_secrets_update(NULL), S2N_ERR_NULL);
/* Derives early secret on CLIENT_HELLO */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
/* Early secret not derived if early data not requested */
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
/* Early secret not derived if early data rejected */
conn->early_data_state = S2N_EARLY_DATA_REJECTED;
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
/* Early secret derived if early data requested */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
/* Clear secret */
EXPECT_MEMCPY_SUCCESS(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
/* Early secret derived if early data accepted */
conn->early_data_state = S2N_EARLY_DATA_ACCEPTED;
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_early_secret,
empty_secret, sizeof(empty_secret));
};
/* Derives handshake secrets on SERVER_HELLO */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_connection_set_test_handshake_secret(conn, &test_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_handshake_secret,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.server_handshake_secret,
empty_secret, sizeof(empty_secret));
while (s2n_conn_get_current_message_type(conn) != SERVER_HELLO) {
conn->handshake.message_number++;
}
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_handshake_secret,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.server_handshake_secret,
empty_secret, sizeof(empty_secret));
};
/* Computes finished keys on SERVER_HELLO */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_connection_set_test_handshake_secret(conn, &test_secret));
EXPECT_EQUAL(conn->handshake.finished_len, 0);
EXPECT_BYTEARRAY_EQUAL(conn->handshake.client_finished,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->handshake.server_finished,
empty_secret, sizeof(empty_secret));
while (s2n_conn_get_current_message_type(conn) != SERVER_HELLO) {
conn->handshake.message_number++;
}
EXPECT_OK(s2n_tls13_secrets_update(conn));
uint8_t expected_len = 0;
EXPECT_SUCCESS(s2n_hmac_digest_size(conn->secure->cipher_suite->prf_alg, &expected_len));
EXPECT_EQUAL(conn->handshake.finished_len, expected_len);
EXPECT_BYTEARRAY_NOT_EQUAL(conn->handshake.client_finished,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->handshake.server_finished,
empty_secret, sizeof(empty_secret));
};
/* Derives application secrets on SERVER_FINISHED */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_connection_set_test_master_secret(conn, &test_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.client_app_secret,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.server_app_secret,
empty_secret, sizeof(empty_secret));
while (s2n_conn_get_current_message_type(conn) != SERVER_FINISHED) {
conn->handshake.message_number++;
}
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.client_app_secret,
empty_secret, sizeof(empty_secret));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.server_app_secret,
empty_secret, sizeof(empty_secret));
};
/* Derives resumption secret on CLIENT_FINISHED */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_connection_set_test_master_secret(conn, &test_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.resumption_master_secret,
empty_secret, sizeof(empty_secret));
while (s2n_conn_get_current_message_type(conn) != CLIENT_FINISHED) {
conn->handshake.message_number++;
}
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.resumption_master_secret,
empty_secret, sizeof(empty_secret));
};
};
/* s2n_connection_export_secret */
{
/* Derives exporter secret on SERVER_FINISHED */
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
conn->secure->cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_connection_set_test_master_secret(conn, &test_secret));
EXPECT_BYTEARRAY_EQUAL(conn->secrets.version.tls13.exporter_master_secret,
empty_secret, sizeof(empty_secret));
while (s2n_conn_get_current_message_type(conn) != SERVER_FINISHED) {
conn->handshake.message_number++;
}
EXPECT_OK(s2n_tls13_secrets_update(conn));
EXPECT_BYTEARRAY_NOT_EQUAL(conn->secrets.version.tls13.exporter_master_secret,
empty_secret, sizeof(empty_secret));
/*
* s2n_connection_tls_exporter requires us to finish the handshake.
* The above is needed since s2n_tls13_secrets_update will only
* initialize when it sees the SERVER_FINISHED frame.
*/
EXPECT_OK(s2n_skip_handshake(conn));
uint8_t output[32] = { 0 };
int result = s2n_connection_tls_exporter(
conn,
(const uint8_t *) "label",
sizeof("label") - 1,
(const uint8_t *) "context",
sizeof("context") - 1,
output,
sizeof(output));
EXPECT_SUCCESS(result);
/*
* If updating this value, it's a good idea to make sure the update
* matches OpenSSL's SSL_export_keying_material. The easiest known
* way of doing that is building a simple client/server pair and
* calling the s2n and OpenSSL APIs after a handshake on both
* sides; you should get identical results with identical
* label/context parameters. This particular value though is not
* checked as its dependent on the s2n-specific test master secret.
*/
S2N_BLOB_FROM_HEX(expected, "3a 72 eb 08 10 a3 69 f3 06 f2 77 11 70 ad d5 76 bd 21 15 \
46 d4 c8 fb 80 1a 93 04 1e ac 59 aa 47");
EXPECT_EQUAL(sizeof(output), expected.size);
EXPECT_BYTEARRAY_EQUAL(output, expected.data, expected.size);
};
};
END_TEST();
}
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