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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 "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_early_data.h"
#define TEST_MAX_EARLY_DATA_SIZE 1000
#define EXPECT_SUCCESS_S2N_SEND(conn, data, data_len, blocked) \
EXPECT_EQUAL(s2n_send(conn, data, data_len, blocked), data_len)
#define EXPECT_SUCCESS_S2N_RECV(conn, data_buffer, data_buffer_size, blocked, data, data_len) \
EXPECT_EQUAL(s2n_recv(conn, data_buffer, data_buffer_size, blocked), data_len); \
EXPECT_BYTEARRAY_EQUAL(data_buffer, data, data_len)
static S2N_RESULT s2n_test_client_and_server_new(struct s2n_connection **client_conn, struct s2n_connection **server_conn)
{
*client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(*client_conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(*client_conn, "default_tls13"));
*server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(*server_conn);
EXPECT_SUCCESS(s2n_connection_set_blinding(*server_conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(*server_conn, "default_tls13"));
struct s2n_test_io_pair io_pair = { 0 };
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(*client_conn, *server_conn, &io_pair));
return S2N_RESULT_OK;
}
struct s2n_offered_early_data *async_early_data = NULL;
static int s2n_test_async_early_data_cb(struct s2n_connection *conn, struct s2n_offered_early_data *early_data)
{
POSIX_ENSURE_REF(conn);
async_early_data = early_data;
return S2N_SUCCESS;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
if (!s2n_is_tls13_fully_supported()) {
END_TEST();
}
const uint8_t test_data[] = "hello world";
DEFER_CLEANUP(struct s2n_psk *test_psk = s2n_external_psk_new(), s2n_psk_free);
EXPECT_SUCCESS(s2n_psk_set_identity(test_psk, test_data, sizeof(test_data)));
EXPECT_SUCCESS(s2n_psk_set_secret(test_psk, test_data, sizeof(test_data)));
EXPECT_SUCCESS(s2n_psk_configure_early_data(test_psk, TEST_MAX_EARLY_DATA_SIZE, 0x13, 0x01));
DEFER_CLEANUP(struct s2n_psk *test_psk_without_early_data = s2n_external_psk_new(), s2n_psk_free);
EXPECT_SUCCESS(s2n_psk_set_identity(test_psk_without_early_data, test_data, sizeof(test_data)));
EXPECT_SUCCESS(s2n_psk_set_secret(test_psk_without_early_data, test_data, sizeof(test_data)));
DEFER_CLEANUP(struct s2n_psk *test_psk_to_reject = s2n_external_psk_new(), s2n_psk_free);
EXPECT_SUCCESS(s2n_psk_set_identity(test_psk_to_reject, test_data, sizeof(test_data)));
EXPECT_SUCCESS(s2n_psk_set_secret(test_psk_to_reject, test_data, sizeof(test_data)));
EXPECT_SUCCESS(s2n_psk_configure_early_data(test_psk_to_reject, TEST_MAX_EARLY_DATA_SIZE, 0x13, 0x03));
struct s2n_cert_chain_and_key *cert_chain = NULL;
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&cert_chain,
S2N_DEFAULT_ECDSA_TEST_CERT_CHAIN, S2N_DEFAULT_ECDSA_TEST_PRIVATE_KEY));
struct s2n_config *config_with_cert = s2n_config_new();
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config_with_cert, cert_chain));
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config_with_cert));
/* Test s2n_negotiate with early data */
{
/* Early data not supported by server */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data not supported by client */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_FALSE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_FALSE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Server does not support TLS1.3 */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, "test_all"));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, "test_all_tls12"));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config_with_cert));
/* Stop the TLS1.2 server before the CLIENT_KEY message. At that point, it will attempt to read
* a CLIENT_KEY message but instead receive CLIENT_CHANGE_CIPHER_SPEC. But this error is
* irrelevant to the test: TLS1.2 servers aren't expected to successfully handle early data.
*
* What we really care about is how the client reacts to the TLS1.2 SERVER_HELLO.
*/
EXPECT_ERROR_WITH_ERRNO(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn, CLIENT_KEY),
S2N_ERR_PROTOCOL_VERSION_UNSUPPORTED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data accepted */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
END_OF_EARLY_DATA));
/* Blocked indefinitely */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
for (size_t i = 0; i < 10; i++) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(client_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_EQUAL(blocked, S2N_BLOCKED_ON_EARLY_DATA);
}
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(WITH_EARLY_DATA(client_conn));
EXPECT_TRUE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data accepted asynchronously */
{
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
struct s2n_config *config = s2n_config_new();
EXPECT_SUCCESS(s2n_config_set_early_data_cb(config, s2n_test_async_early_data_cb));
EXPECT_NOT_NULL(config);
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
/* Blocks on processing the ClientHello */
EXPECT_OK(s2n_negotiate_until_message(client_conn, &blocked, SERVER_HELLO));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
/* Still blocks if called again */
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
/* Accept early data */
EXPECT_SUCCESS(s2n_offered_early_data_accept(async_early_data));
/* Finish early data */
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_TRUE(WITH_EARLY_DATA(client_conn));
EXPECT_TRUE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Early data rejected */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk_without_early_data));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data rejected asynchronously */
{
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
struct s2n_config *config = s2n_config_new();
EXPECT_SUCCESS(s2n_config_set_early_data_cb(config, s2n_test_async_early_data_cb));
EXPECT_NOT_NULL(config);
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
/* Blocks on processing the ClientHello */
EXPECT_OK(s2n_negotiate_until_message(client_conn, &blocked, SERVER_HELLO));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
/* Still blocks if called again */
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_ASYNC_BLOCKED);
EXPECT_SUCCESS(s2n_offered_early_data_reject(async_early_data));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Early data rejected and ignored */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk_to_reject));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_HELLO));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
/* Send some early data to verify the server ignores it */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data rejected, but too much early data received */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk_to_reject));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_HELLO));
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_TRUE((TEST_MAX_EARLY_DATA_SIZE / sizeof(test_data)) > 0);
for (size_t i = 0; i < (TEST_MAX_EARLY_DATA_SIZE / sizeof(test_data)); i++) {
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
}
/* Trick the client into sending more early data than allowed */
client_conn->early_data_bytes = 0;
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server_conn, client_conn),
S2N_ERR_MAX_EARLY_DATA_SIZE);
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data rejected due to HRR */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
client_conn->security_policy_override = &security_policy_test_tls13_retry;
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_TRUE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_TRUE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* Early data rejected due to HRR, but received anyway and ignored. */
{
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
struct s2n_test_io_pair io_pair = { 0 };
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
/* We run this multiple times because if the early data is incorrectly processed as a normal,
* unencrypted record, it is usually just ignored anyway because the record type is unknown.
* An error will only occur if the encryption happens to produce a known record type as the
* last non-padding byte.
*
* We handle 4 record types (HANDSHAKE, APPLICATION_DATA, ALERT, and CHANGE_CIPHER_SPEC).
* So the chance this test produces a false negative (succeeds when it should fail):
* (((256 - 4) / 256) ^ 450) = 0.0008, < 0.1%
*
* (This calculation ignores the case where the encryption produces an apparently padded record.
* That would increase the number of records not ignored, making a false negative even less likely)
*/
const size_t repetitions = 450;
for (size_t i = 0; i < repetitions; i++) {
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client_conn, "default_tls13"));
EXPECT_SUCCESS(s2n_connection_set_blinding(server_conn, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server_conn, "default_tls13"));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client_conn, server_conn, &io_pair));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
client_conn->security_policy_override = &security_policy_test_tls13_retry;
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_OK(s2n_negotiate_until_message(client_conn, &blocked, SERVER_HELLO));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), SERVER_HELLO);
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_TRUE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_TRUE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(client_conn));
EXPECT_SUCCESS(s2n_connection_wipe(server_conn));
}
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
EXPECT_SUCCESS(s2n_io_pair_close(&io_pair));
};
/* PSK rejected altogether */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_set_config(client_conn, config_with_cert));
EXPECT_SUCCESS(s2n_connection_set_config(server_conn, config_with_cert));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(client_conn));
EXPECT_FALSE(WITH_EARLY_DATA(server_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(client_conn));
EXPECT_TRUE(WITH_EARLY_CLIENT_CCS(server_conn));
EXPECT_TRUE(IS_FULL_HANDSHAKE(client_conn));
EXPECT_TRUE(IS_FULL_HANDSHAKE(server_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(client_conn));
EXPECT_FALSE(IS_HELLO_RETRY_HANDSHAKE(server_conn));
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), APPLICATION_DATA);
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), APPLICATION_DATA);
EXPECT_SUCCESS(s2n_shutdown_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
/* Test s2n_send with early data */
{
/* End early data after the server accepts the early data request */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
/* Can't send early data before negotiation begins */
EXPECT_EQUAL(client_conn->early_data_state, S2N_UNKNOWN_EARLY_DATA_STATE);
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, test_data, sizeof(test_data), &blocked),
S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, test_data, 0, &blocked),
S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_HELLO));
/* Can send after early data requested */
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_FINISHED));
/* Can send after early data accepted */
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
/* Can send zero-length */
EXPECT_SUCCESS_S2N_SEND(client_conn, NULL, 0, &blocked);
/* Can send more */
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
/* Can't send too much early data */
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, test_data, TEST_MAX_EARLY_DATA_SIZE, &blocked),
S2N_ERR_MAX_EARLY_DATA_SIZE);
/* Can continue sending, even if a send failed */
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
/* Can't send early data after end of early data indicated */
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, NULL, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
/* Continue the handshake */
EXPECT_ERROR_WITH_ERRNO(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn, CLIENT_FINISHED),
S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_FINISHED);
/* Can't send early data after END_OF_EARLY_DATA sent */
EXPECT_EQUAL(client_conn->early_data_state, S2N_END_OF_EARLY_DATA);
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, NULL, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* End early data before the server accepts the early data request. */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_HELLO));
/* Can send after early data requested */
EXPECT_EQUAL(client_conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
/* Can't send early data after end of early data indicated */
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, NULL, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
/* Continue the handshake */
EXPECT_ERROR_WITH_ERRNO(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn, CLIENT_FINISHED),
S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_EQUAL(s2n_conn_get_current_message_type(client_conn), CLIENT_FINISHED);
/* Still can't send early data after END_OF_EARLY_DATA sent */
EXPECT_EQUAL(client_conn->early_data_state, S2N_END_OF_EARLY_DATA);
EXPECT_FAILURE_WITH_ERRNO(s2n_send(client_conn, NULL, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* s2n_send reports early data bytes on partial writes */
{
DEFER_CLEANUP(struct s2n_connection *client_conn = NULL, s2n_connection_ptr_free);
DEFER_CLEANUP(struct s2n_connection *server_conn = NULL, s2n_connection_ptr_free);
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
/* Configure the connection to use stuffers instead of fds.
* This will let us block the send.
*/
DEFER_CLEANUP(struct s2n_stuffer client_in = { 0 }, s2n_stuffer_free);
DEFER_CLEANUP(struct s2n_stuffer client_out = { 0 }, s2n_stuffer_free);
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&client_in, 0));
EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&client_out, 0));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&client_in, &client_out, client_conn));
EXPECT_SUCCESS(s2n_connection_set_io_stuffers(&client_out, &client_in, server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
const uint8_t large_test_data[TEST_MAX_EARLY_DATA_SIZE] = "hello";
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
END_OF_EARLY_DATA));
/* Only allocate space for one record to be written */
size_t fragment_len = 100;
EXPECT_TRUE(fragment_len < TEST_MAX_EARLY_DATA_SIZE);
client_conn->max_outgoing_fragment_length = fragment_len;
EXPECT_SUCCESS(s2n_stuffer_free(&client_out));
/* This is just an estimate: the record overhead means we need more
* than fragment_len space, but we need less than fragment_len * 2
* so that we only write one record. */
size_t out_size = fragment_len * 1.5;
EXPECT_SUCCESS(s2n_stuffer_alloc(&client_out, out_size));
/* Try to send more than one record of data.
* s2n_send should block, but report the early data that was sent before it blocked.
*/
size_t actual_send_size = s2n_send(client_conn, large_test_data, fragment_len * 2, &blocked);
EXPECT_EQUAL(blocked, S2N_BLOCKED_ON_WRITE);
EXPECT_EQUAL(actual_send_size, fragment_len);
EXPECT_EQUAL(client_conn->early_data_bytes, fragment_len);
};
};
/* Test s2n_recv with early data */
{
/* s2n_recv can read early data sent with s2n_send */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
uint8_t test_buffer[TEST_MAX_EARLY_DATA_SIZE] = { 0 };
/* Can't recv early data before negotiation begins */
EXPECT_EQUAL(server_conn->early_data_state, S2N_UNKNOWN_EARLY_DATA_STATE);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, sizeof(test_buffer), &blocked),
S2N_ERR_EARLY_DATA_NOT_ALLOWED);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, 0, &blocked),
S2N_ERR_EARLY_DATA_NOT_ALLOWED);
/* Can't recv before END_OF_EARLY_DATA */
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
SERVER_HELLO));
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
/* Can recv on END_OF_EARLY_DATA */
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
END_OF_EARLY_DATA));
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, 0, &blocked, test_data, 0);
/* Can recv after s2n_negotiate decrypts the record */
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, sizeof(test_buffer), &blocked,
test_data, sizeof(test_data));
EXPECT_BYTEARRAY_EQUAL(test_buffer, test_data, sizeof(test_data));
/* Can spread recv over multiple calls */
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, 0, &blocked, test_data, 0);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, 2, &blocked, test_data, 2);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, (sizeof(test_data) - 2), &blocked,
(test_data + 2), (sizeof(test_data) - 2));
/* Can block + recv repeatedly on the same record */
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, 2, &blocked, test_data, 2);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, 0, &blocked, test_data, 0);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, (sizeof(test_data) - 2), &blocked,
(test_data + 2), (sizeof(test_data) - 2));
/* Can't recv after END_OF_EARLY_DATA */
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn, CLIENT_FINISHED));
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, 0, &blocked), S2N_ERR_EARLY_DATA_NOT_ALLOWED);
/* Can finish handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server_conn, client_conn));
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* s2n_recv fails if it encounters a handshake message instead of early data. */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
uint8_t test_buffer[TEST_MAX_EARLY_DATA_SIZE] = { 0 };
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
END_OF_EARLY_DATA));
/* Client sends the EndOfEarlyData handshake message */
EXPECT_SUCCESS(s2n_connection_set_end_of_early_data(client_conn));
EXPECT_SUCCESS(s2n_negotiate(client_conn, &blocked));
/* Server fails to read the EndOfEarlyData handshake message via s2n_recv.
* s2n_recv can only process post-handshake messages, and EndOfEarlyData is not a post-handshake
* message.
* We should have read the EndOfEarlyData handshake message via s2n_negotiate.
*/
EXPECT_EQUAL(s2n_conn_get_current_message_type(server_conn), END_OF_EARLY_DATA);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, sizeof(test_buffer), &blocked),
S2N_ERR_BAD_MESSAGE);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
/* s2n_recv fails on too much early data */
{
struct s2n_connection *client_conn = NULL, *server_conn = NULL;
EXPECT_OK(s2n_test_client_and_server_new(&client_conn, &server_conn));
EXPECT_SUCCESS(s2n_connection_append_psk(client_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_append_psk(server_conn, test_psk));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(client_conn));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(server_conn));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
const uint8_t large_test_data[TEST_MAX_EARLY_DATA_SIZE] = "hello";
uint8_t test_buffer[TEST_MAX_EARLY_DATA_SIZE] = { 0 };
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server_conn, client_conn,
END_OF_EARLY_DATA));
/* Send the maximum allowed data */
EXPECT_SUCCESS_S2N_SEND(client_conn, large_test_data, sizeof(large_test_data), &blocked);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_SUCCESS_S2N_RECV(server_conn, test_buffer, sizeof(test_buffer), &blocked,
large_test_data, TEST_MAX_EARLY_DATA_SIZE);
/* Trick the client into sending more */
client_conn->early_data_bytes = 0;
EXPECT_SUCCESS_S2N_SEND(client_conn, test_data, sizeof(test_data), &blocked);
/* The server should fail to accept the data */
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server_conn, &blocked), S2N_ERR_EARLY_DATA_BLOCKED);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server_conn, test_buffer, sizeof(test_buffer), &blocked),
S2N_ERR_MAX_EARLY_DATA_SIZE);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
EXPECT_SUCCESS(s2n_config_free(config_with_cert));
EXPECT_SUCCESS(s2n_cert_chain_and_key_free(cert_chain));
END_TEST();
}
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