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s2n_early_data_test.c
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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_early_data.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#define TEST_SIZE 10
typedef struct {
const s2n_early_data_state *states;
size_t len;
} s2n_early_state_sequence;
/* We want to verify that applying s2n_connection_set_early_data_state to the current state
* can only produce valid state sequences.
*
* We check every possible next state and verify that the only transitions that
* s2n_connection_set_early_data_state allows are those in the valid state sequences. Then, for
* every valid transition, we call this method again recursively. The recursion ends when we either
* reach the end of a valid state sequence or encounter an invalid state sequence.
*/
static S2N_RESULT s2n_test_all_early_data_sequences(struct s2n_connection *conn, size_t i,
const s2n_early_state_sequence *valid_early_state_sequences, size_t valid_early_state_sequences_len)
{
s2n_early_data_state current_state = conn->early_data_state;
for (s2n_early_data_state next_state = 0; next_state < S2N_EARLY_DATA_STATES_COUNT; next_state++) {
/* We always allow no-op transitions, so ignore them */
if (next_state == current_state) {
continue;
}
conn->early_data_state = current_state;
bool actual_valid = s2n_result_is_ok(s2n_connection_set_early_data_state(conn, next_state));
bool expected_valid = false;
size_t next_i = i + 1;
for (size_t j = 0; j < valid_early_state_sequences_len; j++) {
if (next_i < valid_early_state_sequences[j].len) {
expected_valid |= (valid_early_state_sequences[j].states[i] == current_state)
&& (valid_early_state_sequences[j].states[next_i] == next_state);
}
}
RESULT_ENSURE_EQ(actual_valid, expected_valid);
if (expected_valid) {
RESULT_GUARD(s2n_test_all_early_data_sequences(conn, i + 1,
valid_early_state_sequences, valid_early_state_sequences_len));
}
}
return S2N_RESULT_OK;
}
static S2N_RESULT s2n_alloc_test_config_buffers(struct s2n_early_data_config *config)
{
RESULT_GUARD_POSIX(s2n_alloc(&config->application_protocol, TEST_SIZE));
RESULT_ENSURE_NE(config->application_protocol.size, 0);
RESULT_GUARD_POSIX(s2n_alloc(&config->context, TEST_SIZE));
RESULT_ENSURE_NE(config->context.size, 0);
return S2N_RESULT_OK;
}
static S2N_RESULT s2n_test_config_buffers_freed(struct s2n_early_data_config *config)
{
RESULT_ENSURE_EQ(config->application_protocol.data, NULL);
RESULT_ENSURE_EQ(config->application_protocol.size, 0);
RESULT_ENSURE_EQ(config->context.data, NULL);
RESULT_ENSURE_EQ(config->context.size, 0);
return S2N_RESULT_OK;
}
static int s2n_test_early_data_cb(struct s2n_connection *conn, struct s2n_offered_early_data *early_data)
{
POSIX_ENSURE_REF(conn);
uint16_t context_len = 0;
POSIX_GUARD(s2n_offered_early_data_get_context_length(early_data, &context_len));
POSIX_ENSURE_EQ(context_len, 1);
uint8_t context = 0;
POSIX_GUARD(s2n_offered_early_data_get_context(early_data, &context, 1));
if (context) {
POSIX_GUARD(s2n_offered_early_data_accept(early_data));
} else {
POSIX_GUARD(s2n_offered_early_data_reject(early_data));
}
return S2N_SUCCESS;
}
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();
const uint8_t test_value[] = "test value";
const uint8_t test_value_2[] = "more test data";
const uint32_t nonzero_max_early_data = 10;
/* Test s2n_connection_set_early_data_state */
{
/* Safety check */
EXPECT_ERROR_WITH_ERRNO(s2n_connection_set_early_data_state(NULL, 0), S2N_ERR_NULL);
const s2n_early_data_state early_data_not_requested_seq[] = {
S2N_UNKNOWN_EARLY_DATA_STATE, S2N_EARLY_DATA_NOT_REQUESTED
};
const s2n_early_data_state early_data_rejected_seq[] = {
S2N_UNKNOWN_EARLY_DATA_STATE, S2N_EARLY_DATA_REQUESTED, S2N_EARLY_DATA_REJECTED
};
const s2n_early_data_state early_data_success_seq[] = {
S2N_UNKNOWN_EARLY_DATA_STATE, S2N_EARLY_DATA_REQUESTED, S2N_EARLY_DATA_ACCEPTED, S2N_END_OF_EARLY_DATA
};
/* Test known valid / invalid transitions */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
conn->early_data_state = 0;
EXPECT_OK(s2n_connection_set_early_data_state(conn, S2N_UNKNOWN_EARLY_DATA_STATE));
conn->early_data_state = 0;
EXPECT_ERROR_WITH_ERRNO(s2n_connection_set_early_data_state(conn, S2N_EARLY_DATA_STATES_COUNT),
S2N_ERR_INVALID_EARLY_DATA_STATE);
conn->early_data_state = 0;
EXPECT_ERROR_WITH_ERRNO(s2n_connection_set_early_data_state(conn, S2N_EARLY_DATA_STATES_COUNT + 1),
S2N_ERR_INVALID_EARLY_DATA_STATE);
conn->early_data_state = 0;
EXPECT_OK(s2n_connection_set_early_data_state(conn, S2N_EARLY_DATA_REQUESTED));
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_OK(s2n_connection_set_early_data_state(conn, S2N_EARLY_DATA_REJECTED));
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_ERROR_WITH_ERRNO(s2n_connection_set_early_data_state(conn, S2N_END_OF_EARLY_DATA),
S2N_ERR_INVALID_EARLY_DATA_STATE);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test that only the expected sequences of states are possible.
* Given every possible sequence of early data states, test that s2n_connection_set_early_data_state
* can only be used to iterate through the known valid sequences. */
{
/* Test with the correct expected sequences */
{
const s2n_early_state_sequence valid_early_state_sequences[] = {
{ .states = early_data_not_requested_seq, .len = s2n_array_len(early_data_not_requested_seq) },
{ .states = early_data_rejected_seq, .len = s2n_array_len(early_data_rejected_seq) },
{ .states = early_data_success_seq, .len = s2n_array_len(early_data_success_seq) },
};
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_OK(s2n_test_all_early_data_sequences(conn, 0,
valid_early_state_sequences, s2n_array_len(valid_early_state_sequences)));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Sanity check: adding an invalid expected sequence causes test to fail */
{
const s2n_early_data_state invalid_seq[] = {
S2N_UNKNOWN_EARLY_DATA_STATE, S2N_EARLY_DATA_ACCEPTED, S2N_END_OF_EARLY_DATA
};
const s2n_early_state_sequence test_early_state_sequences[] = {
{ .states = early_data_not_requested_seq, .len = s2n_array_len(early_data_not_requested_seq) },
{ .states = early_data_rejected_seq, .len = s2n_array_len(early_data_rejected_seq) },
{ .states = early_data_success_seq, .len = s2n_array_len(early_data_success_seq) },
{ .states = invalid_seq, .len = s2n_array_len(invalid_seq) },
};
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_ERROR(s2n_test_all_early_data_sequences(conn, 0,
test_early_state_sequences, s2n_array_len(test_early_state_sequences)));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Sanity check: removing one of the expected sequences causes test to fail */
{
const s2n_early_state_sequence test_early_state_sequences[] = {
{ .states = early_data_not_requested_seq, .len = s2n_array_len(early_data_not_requested_seq) },
{ .states = early_data_success_seq, .len = s2n_array_len(early_data_success_seq) },
};
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_ERROR(s2n_test_all_early_data_sequences(conn, 0,
test_early_state_sequences, s2n_array_len(test_early_state_sequences)));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
};
/* Test s2n_early_data_config_free */
{
/* Safety check */
EXPECT_OK(s2n_early_data_config_free(NULL));
/* Resets everything */
{
struct s2n_early_data_config config = { 0 };
EXPECT_OK(s2n_alloc_test_config_buffers(&config));
EXPECT_OK(s2n_early_data_config_free(&config));
EXPECT_OK(s2n_test_config_buffers_freed(&config));
};
/* Called by s2n_psk_wipe */
{
struct s2n_psk psk = { 0 };
EXPECT_OK(s2n_alloc_test_config_buffers(&psk.early_data_config));
EXPECT_OK(s2n_psk_wipe(&psk));
EXPECT_OK(s2n_test_config_buffers_freed(&psk.early_data_config));
};
/* Called by s2n_psk_free */
{
struct s2n_psk *psk = s2n_external_psk_new();
EXPECT_OK(s2n_alloc_test_config_buffers(&psk->early_data_config));
EXPECT_SUCCESS(s2n_psk_free(&psk));
/* A memory leak in this test would indicate that s2n_psk_free isn't freeing the buffers. */
};
};
/* Test s2n_psk_configure_early_data */
{
/* Safety */
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_configure_early_data(NULL, nonzero_max_early_data, 1, 1), S2N_ERR_NULL);
/* Set valid configuration */
{
uint32_t expected_max_early_data_size = 1000;
const struct s2n_cipher_suite *expected_cipher_suite = &s2n_tls13_aes_128_gcm_sha256;
struct s2n_psk *psk = s2n_external_psk_new();
EXPECT_SUCCESS(s2n_psk_configure_early_data(psk, expected_max_early_data_size,
expected_cipher_suite->iana_value[0], expected_cipher_suite->iana_value[1]));
EXPECT_EQUAL(psk->early_data_config.max_early_data_size, expected_max_early_data_size);
EXPECT_EQUAL(psk->early_data_config.protocol_version, S2N_TLS13);
EXPECT_EQUAL(psk->early_data_config.cipher_suite, expected_cipher_suite);
};
/* Set cipher suite must match hmac algorithm */
{
DEFER_CLEANUP(struct s2n_psk *psk = s2n_external_psk_new(), s2n_psk_free);
const struct s2n_cipher_suite *cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
psk->hmac_alg = cipher_suite->prf_alg + 1;
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_configure_early_data(psk, nonzero_max_early_data,
cipher_suite->iana_value[0], cipher_suite->iana_value[1]),
S2N_ERR_INVALID_ARGUMENT);
psk->hmac_alg = cipher_suite->prf_alg;
EXPECT_SUCCESS(s2n_psk_configure_early_data(psk, nonzero_max_early_data,
cipher_suite->iana_value[0], cipher_suite->iana_value[1]));
EXPECT_EQUAL(psk->early_data_config.cipher_suite, cipher_suite);
};
};
/* Test s2n_psk_set_application_protocol */
{
/* Safety checks */
{
struct s2n_psk psk = { 0 };
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_set_application_protocol(&psk, NULL, 1), S2N_ERR_NULL);
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_set_application_protocol(NULL, test_value, 1), S2N_ERR_NULL);
};
DEFER_CLEANUP(struct s2n_psk *psk = s2n_external_psk_new(), s2n_psk_free);
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, 0);
EXPECT_EQUAL(psk->early_data_config.application_protocol.allocated, 0);
/* Set empty value as no-op */
EXPECT_SUCCESS(s2n_psk_set_application_protocol(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, 0);
EXPECT_EQUAL(psk->early_data_config.application_protocol.allocated, 0);
/* Set valid value */
EXPECT_SUCCESS(s2n_psk_set_application_protocol(psk, test_value, sizeof(test_value)));
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, sizeof(test_value));
EXPECT_BYTEARRAY_EQUAL(psk->early_data_config.application_protocol.data, test_value, sizeof(test_value));
/* Replace previous value */
EXPECT_SUCCESS(s2n_psk_set_application_protocol(psk, test_value_2, sizeof(test_value_2)));
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, sizeof(test_value_2));
EXPECT_BYTEARRAY_EQUAL(psk->early_data_config.application_protocol.data, test_value_2, sizeof(test_value_2));
/* Clear with empty value */
EXPECT_SUCCESS(s2n_psk_set_application_protocol(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, 0);
EXPECT_EQUAL(psk->early_data_config.application_protocol.allocated, 0);
/* Repeat clear */
EXPECT_SUCCESS(s2n_psk_set_application_protocol(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.application_protocol.size, 0);
EXPECT_EQUAL(psk->early_data_config.application_protocol.allocated, 0);
};
/* Test s2n_psk_set_early_data_context */
{
/* Safety checks */
{
struct s2n_psk psk = { 0 };
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_set_early_data_context(&psk, NULL, 1), S2N_ERR_NULL);
EXPECT_FAILURE_WITH_ERRNO(s2n_psk_set_early_data_context(NULL, test_value, 1), S2N_ERR_NULL);
};
DEFER_CLEANUP(struct s2n_psk *psk = s2n_external_psk_new(), s2n_psk_free);
EXPECT_EQUAL(psk->early_data_config.context.size, 0);
EXPECT_EQUAL(psk->early_data_config.context.allocated, 0);
/* Set empty value as no-op */
EXPECT_SUCCESS(s2n_psk_set_early_data_context(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.context.size, 0);
EXPECT_EQUAL(psk->early_data_config.context.allocated, 0);
/* Set valid value */
EXPECT_SUCCESS(s2n_psk_set_early_data_context(psk, test_value, sizeof(test_value)));
EXPECT_EQUAL(psk->early_data_config.context.size, sizeof(test_value));
EXPECT_BYTEARRAY_EQUAL(psk->early_data_config.context.data, test_value, sizeof(test_value));
/* Replace previous value */
EXPECT_SUCCESS(s2n_psk_set_early_data_context(psk, test_value_2, sizeof(test_value_2)));
EXPECT_EQUAL(psk->early_data_config.context.size, sizeof(test_value_2));
EXPECT_BYTEARRAY_EQUAL(psk->early_data_config.context.data, test_value_2, sizeof(test_value_2));
/* Clear with empty value */
EXPECT_SUCCESS(s2n_psk_set_early_data_context(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.context.size, 0);
EXPECT_EQUAL(psk->early_data_config.context.allocated, 0);
/* Repeat clear */
EXPECT_SUCCESS(s2n_psk_set_early_data_context(psk, test_value, 0));
EXPECT_EQUAL(psk->early_data_config.context.size, 0);
EXPECT_EQUAL(psk->early_data_config.context.allocated, 0);
};
/* Test s2n_early_data_config_clone */
{
const uint8_t test_bad_value[] = "wrong";
const uint8_t test_apln[] = "protocol";
const uint8_t test_context[] = "context";
const uint8_t test_version = UINT8_MAX;
const uint32_t test_max_early_data = 10;
const struct s2n_cipher_suite *test_cipher_suite = &s2n_tls13_chacha20_poly1305_sha256;
for (size_t called_directly = 0; called_directly < 2; called_directly++) {
struct s2n_psk *original = s2n_external_psk_new();
EXPECT_NOT_NULL(original);
EXPECT_SUCCESS(s2n_psk_configure_early_data(original, test_max_early_data,
test_cipher_suite->iana_value[0], test_cipher_suite->iana_value[1]));
EXPECT_SUCCESS(s2n_psk_set_application_protocol(original, test_apln, sizeof(test_apln)));
EXPECT_SUCCESS(s2n_psk_set_early_data_context(original, test_context, sizeof(test_context)));
original->early_data_config.protocol_version = test_version;
DEFER_CLEANUP(struct s2n_psk *clone = s2n_external_psk_new(), s2n_psk_free);
EXPECT_SUCCESS(s2n_psk_set_application_protocol(clone, test_bad_value, sizeof(test_bad_value)));
EXPECT_NOT_NULL(clone);
if (called_directly) {
EXPECT_OK(s2n_early_data_config_clone(clone, &original->early_data_config));
} else {
EXPECT_SUCCESS(s2n_psk_set_identity(original, test_bad_value, sizeof(test_bad_value)));
EXPECT_SUCCESS(s2n_psk_set_secret(original, test_bad_value, sizeof(test_bad_value)));
EXPECT_OK(s2n_psk_clone(clone, original));
}
/* Check that the blobs weren't shallow copied */
EXPECT_NOT_EQUAL(original->early_data_config.application_protocol.data,
clone->early_data_config.application_protocol.data);
EXPECT_NOT_EQUAL(original->early_data_config.context.data, clone->early_data_config.context.data);
/* Free the original to ensure they share no memory */
EXPECT_SUCCESS(s2n_psk_free(&original));
/* existing alpn is replaced by original's alpn */
EXPECT_EQUAL(clone->early_data_config.application_protocol.size, sizeof(test_apln));
EXPECT_BYTEARRAY_EQUAL(clone->early_data_config.application_protocol.data, test_apln, sizeof(test_apln));
/* new context is allocated for original's context */
EXPECT_EQUAL(clone->early_data_config.context.size, sizeof(test_context));
EXPECT_BYTEARRAY_EQUAL(clone->early_data_config.context.data, test_context, sizeof(test_context));
/* other values are copied */
EXPECT_EQUAL(clone->early_data_config.max_early_data_size, test_max_early_data);
EXPECT_EQUAL(clone->early_data_config.cipher_suite, test_cipher_suite);
EXPECT_EQUAL(clone->early_data_config.protocol_version, test_version);
}
};
/* Test s2n_early_data_is_valid_for_connection */
{
/* Safety check */
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(NULL));
/* Not valid if the first wire PSK was not chosen
*
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.10
*= type=test
*# In order to accept early data, the server MUST have accepted a PSK
*# cipher suite and selected the first key offered in the client's
*# "pre_shared_key" extension.
**/
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
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->early_data_state = S2N_EARLY_DATA_REQUESTED;
/* No chosen PSK */
EXPECT_NULL(conn->psk_params.chosen_psk);
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
/* PSK chosen, but not first PSK */
conn->psk_params.chosen_psk_wire_index = 5;
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
/* First PSK chosen */
conn->psk_params.chosen_psk_wire_index = 0;
EXPECT_TRUE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/**
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.10
*= type=test
*# In addition, it MUST verify that the
*# following values are the same as those associated with the
*# selected PSK:
**/
{
/**
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.10
*= type=test
*# - The TLS version number
**/
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS12;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS12));
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
/* Reset state machine */
conn->handshake.state_machine = S2N_STATE_MACHINE_INITIAL;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
EXPECT_TRUE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/**
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.10
*= type=test
*# - The selected cipher suite
**/
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
conn->actual_protocol_version = S2N_TLS13;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->secure->cipher_suite = &s2n_tls13_chacha20_poly1305_sha256;
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
EXPECT_TRUE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/**
*= https://www.rfc-editor.org/rfc/rfc8446#section-4.2.10
*= type=test
*# - The selected ALPN [RFC7301] protocol, if any
**/
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_conn_choose_state_machine(conn, S2N_TLS13));
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
const uint8_t empty_protocol[] = "";
const uint8_t required_protocol[] = "required_protocol";
const uint8_t wrong_protocol[] = "wrong protocol";
/* No early data alpn set, no alpn negotiated */
EXPECT_TRUE(s2n_early_data_is_valid_for_connection(conn));
/* No early data alpn set, but alpn negotiated */
EXPECT_MEMCPY_SUCCESS(conn->application_protocol, required_protocol, sizeof(required_protocol));
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_SUCCESS(s2n_psk_set_application_protocol(conn->psk_params.chosen_psk,
required_protocol, sizeof(required_protocol)));
/* Early data alpn set, but no alpn negotiated */
EXPECT_MEMCPY_SUCCESS(conn->application_protocol, empty_protocol, sizeof(empty_protocol));
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
/* Early data alpn does NOT match negotiated alpn */
EXPECT_MEMCPY_SUCCESS(conn->application_protocol, wrong_protocol, sizeof(wrong_protocol));
EXPECT_FALSE(s2n_early_data_is_valid_for_connection(conn));
/* Early data alpn matches negotiated alpn */
EXPECT_MEMCPY_SUCCESS(conn->application_protocol, required_protocol, sizeof(required_protocol));
EXPECT_TRUE(s2n_early_data_is_valid_for_connection(conn));
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
};
/* Test s2n_early_data_accept_or_reject */
{
/* Safety check */
EXPECT_ERROR_WITH_ERRNO(s2n_early_data_accept_or_reject(NULL), S2N_ERR_NULL);
/* Server */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
/* Early data not enabled */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(conn));
/* Early data not requested */
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
/* Set wrong protocol version */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS12;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Client */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
/* Early data not enabled */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(conn));
/* Early data not requested */
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_NOT_REQUESTED);
/* Set wrong protocol version */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS12;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
conn->actual_protocol_version = S2N_TLS13;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Triggers callback to let application reject early data */
{
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(config);
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(conn));
conn->secure->cipher_suite = &s2n_tls13_aes_256_gcm_sha384;
conn->actual_protocol_version = S2N_TLS13;
/* Without callback set, accepts early data */
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
uint8_t accept_early_data = true;
EXPECT_SUCCESS(s2n_config_set_early_data_cb(config, s2n_test_early_data_cb));
/* With callback set, may still accept early data */
conn->handshake.early_data_async_state = (struct s2n_offered_early_data){ 0 };
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_psk_set_early_data_context(conn->psk_params.chosen_psk, &accept_early_data, sizeof(accept_early_data)));
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_ACCEPTED);
/* With callback set, may reject early data */
accept_early_data = false;
conn->handshake.early_data_async_state = (struct s2n_offered_early_data){ 0 };
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_psk_set_early_data_context(conn->psk_params.chosen_psk, &accept_early_data, sizeof(accept_early_data)));
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Application rejects early data asynchronously */
{
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 *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(conn, "default_tls13"));
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, nonzero_max_early_data, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_connection_set_early_data_expected(conn));
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->early_data_state = S2N_EARLY_DATA_REQUESTED;
/* No decision yet: blocked */
EXPECT_ERROR_WITH_ERRNO(s2n_early_data_accept_or_reject(conn), S2N_ERR_ASYNC_BLOCKED);
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
/* If called again, still blocked */
EXPECT_ERROR_WITH_ERRNO(s2n_early_data_accept_or_reject(conn), S2N_ERR_ASYNC_BLOCKED);
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REQUESTED);
/* Make decision */
EXPECT_SUCCESS(s2n_offered_early_data_reject(async_early_data));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
/* Complete */
EXPECT_OK(s2n_early_data_accept_or_reject(conn));
EXPECT_EQUAL(conn->early_data_state, S2N_EARLY_DATA_REJECTED);
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_config_free(config));
};
};
/* Test s2n_connection_get_early_data_status */
{
const uint32_t limit = 10;
/* Safety */
{
struct s2n_connection conn = { 0 };
s2n_early_data_status_t status = 0;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_early_data_status(NULL, &status), S2N_ERR_NULL);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_early_data_status(&conn, NULL), S2N_ERR_NULL);
conn.early_data_state = S2N_EARLY_DATA_STATES_COUNT;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_early_data_status(&conn, &status), S2N_ERR_INVALID_EARLY_DATA_STATE);
};
/* Correct status returned for current early data state */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
s2n_early_data_status_t status = 0;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_OK);
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_NOT_REQUESTED);
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_OK);
conn->early_data_state = S2N_EARLY_DATA_REJECTED;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_REJECTED);
conn->early_data_state = S2N_EARLY_DATA_ACCEPTED;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_OK);
conn->early_data_state = S2N_END_OF_EARLY_DATA;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
EXPECT_EQUAL(status, S2N_EARLY_DATA_STATUS_END);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Sanity check that all valid early data states successfully report a status */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
s2n_early_data_status_t status = 0;
for (s2n_early_data_state state = 1; state < S2N_EARLY_DATA_STATES_COUNT; state++) {
conn->early_data_state = state;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &status));
}
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Test s2n_connection_get_remaining_early_data_size */
{
const uint32_t limit = 10;
/* Safety */
{
struct s2n_connection conn = { 0 };
uint32_t bytes = 0;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_remaining_early_data_size(NULL, &bytes), S2N_ERR_NULL);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_remaining_early_data_size(&conn, NULL), S2N_ERR_NULL);
};
/* If early data allowed, return the remaining bytes allowed */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
uint32_t bytes = 0;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &bytes));
EXPECT_EQUAL(bytes, limit);
conn->early_data_state = S2N_EARLY_DATA_NOT_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &bytes));
EXPECT_EQUAL(bytes, 0);
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &bytes));
EXPECT_EQUAL(bytes, limit);
conn->early_data_bytes = limit - 1;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &bytes));
EXPECT_EQUAL(bytes, 1);
conn->early_data_bytes = limit;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &bytes));
EXPECT_EQUAL(bytes, 0);
conn->early_data_bytes = limit + 1;
conn->early_data_state = S2N_EARLY_DATA_REQUESTED;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_remaining_early_data_size(conn, &bytes),
S2N_ERR_MAX_EARLY_DATA_SIZE);
EXPECT_EQUAL(bytes, 0);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test that all valid early data states successfully report a zero size */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
uint32_t size = 0;
for (s2n_early_data_state state = 0; state < S2N_EARLY_DATA_STATES_COUNT; state++) {
conn->early_data_state = state;
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &size));
EXPECT_EQUAL(size, 0);
}
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* Test that if S2N_EARLY_DATA_STATUS_OK, then non-zero size reported */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
s2n_early_data_status_t reason = 0;
uint32_t size = 0;
for (s2n_early_data_state state = 0; state < S2N_EARLY_DATA_STATES_COUNT; state++) {
conn->early_data_state = state;
EXPECT_SUCCESS(s2n_connection_get_early_data_status(conn, &reason));
EXPECT_SUCCESS(s2n_connection_get_remaining_early_data_size(conn, &size));
if (reason == S2N_EARLY_DATA_STATUS_OK) {
EXPECT_EQUAL(size, limit);
} else {
EXPECT_EQUAL(size, 0);
}
}
EXPECT_SUCCESS(s2n_connection_free(conn));
};
};
/* Test s2n_connection_get_max_early_data_size */
{
/* Safety */
{
struct s2n_connection conn = { 0 };
uint32_t bytes = 0;
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_max_early_data_size(&conn, NULL), S2N_ERR_NULL);
EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_max_early_data_size(NULL, &bytes), S2N_ERR_NULL);
EXPECT_EQUAL(bytes, 0);
};
/* Retrieve the limit from the first PSK, or return 0 */
{
struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(conn);
const uint32_t limit = 10;
uint32_t actual_bytes = limit;
/* No PSKs: limit is zero */
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, 0);
/* PSK with zero limit: limit is zero */
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, 0, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, 0);
/* Second PSK with non-zero limit: limit is still zero */
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, 0);
/* First PSK with non-zero limit: limit is non-zero */
EXPECT_OK(s2n_psk_parameters_wipe(&conn->psk_params));
EXPECT_OK(s2n_append_test_psk_with_early_data(conn, limit, &s2n_tls13_aes_256_gcm_sha384));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, limit);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* If in server mode, apply the server limit */
{
struct s2n_connection *conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(conn);
const uint32_t psk_limit = 10;
EXPECT_OK(s2n_append_test_chosen_psk_with_early_data(conn, psk_limit, &s2n_tls13_aes_256_gcm_sha384));
uint32_t actual_bytes = 0;
/* server limit is lower, but PSK is external: use PSK limit */
EXPECT_EQUAL(conn->psk_params.chosen_psk->type, S2N_PSK_TYPE_EXTERNAL);
uint32_t server_limit = psk_limit - 1;
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(conn, server_limit));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, psk_limit);
conn->psk_params.chosen_psk->type = S2N_PSK_TYPE_RESUMPTION;
/* server limit is higher: use PSK limit */
server_limit = psk_limit + 1;
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(conn, server_limit));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, psk_limit);
/* server limit is lower and PSK is resumption: use server limit */
server_limit = psk_limit - 1;
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(conn, server_limit));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, server_limit);
EXPECT_SUCCESS(s2n_connection_free(conn));
};
/* If in server mode, fall back to the server limit */
{
const uint32_t server_limit = 15;
uint32_t actual_bytes = 0;
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
EXPECT_NOT_NULL(server_conn);
struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
EXPECT_NOT_NULL(client_conn);
/* No PSKs: use server limit for initial connection */
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(server_conn, server_limit));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(server_conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, server_limit);
/* Client mode: don't use server limit for initial connection */
EXPECT_SUCCESS(s2n_connection_set_server_max_early_data_size(client_conn, server_limit));
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(client_conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, 0);
/* Negotiated connection: once a connection is negotiated, no PSKs means no early data */
server_conn->handshake.handshake_type = NEGOTIATED;
EXPECT_SUCCESS(s2n_connection_get_max_early_data_size(server_conn, &actual_bytes));
EXPECT_EQUAL(actual_bytes, 0);
EXPECT_SUCCESS(s2n_connection_free(client_conn));
EXPECT_SUCCESS(s2n_connection_free(server_conn));
};
};
/* Test s2n_config_set_server_max_early_data_size */
{
/* Safety */
EXPECT_FAILURE_WITH_ERRNO(s2n_config_set_server_max_early_data_size(NULL, 1), S2N_ERR_NULL);
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(config);
EXPECT_EQUAL(config->server_max_early_data_size, 0);
EXPECT_SUCCESS(s2n_config_set_server_max_early_data_size(config, 1));
EXPECT_EQUAL(config->server_max_early_data_size, 1);
EXPECT_SUCCESS(s2n_config_set_server_max_early_data_size(config, UINT32_MAX));
EXPECT_EQUAL(config->server_max_early_data_size, UINT32_MAX);
EXPECT_SUCCESS(s2n_config_free(config));
};
/* Test s2n_connection_set_server_max_early_data_size */