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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_record.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
#define SSLV2_MIN_SIZE 3
int main(int argc, char *argv[])
{
BEGIN_TEST();
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_TEST_CERT_CHAIN, S2N_DEFAULT_TEST_PRIVATE_KEY));
/* Test s2n_sslv2_record_header_parse */
{
const struct {
uint8_t bytes[S2N_TLS_RECORD_HEADER_LENGTH];
uint16_t length;
uint8_t type;
uint8_t version;
} test_cases[] = {
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 0,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE + 1, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 1,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, 0xFF, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 0xFF - SSLV2_MIN_SIZE,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, 0x84, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 0x84 - SSLV2_MIN_SIZE,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { 0x84, 0x84, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 0x484 - SSLV2_MIN_SIZE,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { 0xFF, 0xFF, TLS_CLIENT_HELLO, 0x03, 0x03 },
.length = 0x7FFF - SSLV2_MIN_SIZE,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, 0, 0x03, 0x03 },
.length = 0,
.type = 0,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, 77, 0x03, 0x03 },
.length = 0,
.type = 77,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, TLS_SERVER_HELLO, 0x03, 0x03 },
.length = 0,
.type = TLS_SERVER_HELLO,
.version = S2N_TLS12,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, TLS_CLIENT_HELLO, 0x03, 0x04 },
.length = 0,
.type = TLS_CLIENT_HELLO,
.version = S2N_TLS13,
},
{
.bytes = { S2N_TLS_SSLV2_HEADER_FLAG, SSLV2_MIN_SIZE, TLS_CLIENT_HELLO, 0, 0 },
.length = 0,
.type = TLS_CLIENT_HELLO,
.version = 0,
},
};
/* Test: parse valid record headers */
for (size_t i = 0; i < s2n_array_len(test_cases); i++) {
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&conn->header_in,
test_cases[i].bytes, sizeof(test_cases[i].bytes)));
uint8_t type = 0, version = 0;
uint16_t length = 0;
EXPECT_SUCCESS(s2n_sslv2_record_header_parse(conn, &type, &version, &length));
EXPECT_EQUAL(test_cases[i].type, type);
EXPECT_EQUAL(test_cases[i].version, version);
EXPECT_EQUAL(test_cases[i].length, length);
EXPECT_BYTEARRAY_EQUAL(conn->header_in_data,
test_cases[i].bytes, sizeof(test_cases[i].bytes));
EXPECT_EQUAL(s2n_stuffer_data_available(&conn->header_in), S2N_TLS_RECORD_HEADER_LENGTH);
}
/* Test: parse header with bad length
*
* We already read 3 bytes by reading the header, so logically the message
* is at least 3 bytes long.
*/
{
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
EXPECT_SUCCESS(s2n_stuffer_skip_write(&conn->header_in, S2N_TLS_RECORD_HEADER_LENGTH));
conn->header_in_data[0] = S2N_TLS_SSLV2_HEADER_FLAG;
uint8_t type = 0, version = 0;
uint16_t length = 0;
conn->header_in_data[1] = SSLV2_MIN_SIZE - 1;
EXPECT_FAILURE_WITH_ERRNO(
s2n_sslv2_record_header_parse(conn, &type, &version, &length),
S2N_ERR_BAD_MESSAGE);
EXPECT_EQUAL(s2n_stuffer_data_available(&conn->header_in), 3);
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->header_in));
conn->header_in_data[1] = SSLV2_MIN_SIZE;
EXPECT_SUCCESS(s2n_sslv2_record_header_parse(conn, &type, &version, &length));
EXPECT_EQUAL(s2n_stuffer_data_available(&conn->header_in), S2N_TLS_RECORD_HEADER_LENGTH);
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->header_in));
conn->header_in_data[1] = 0;
EXPECT_FAILURE_WITH_ERRNO(
s2n_sslv2_record_header_parse(conn, &type, &version, &length),
S2N_ERR_BAD_MESSAGE);
EXPECT_EQUAL(s2n_stuffer_data_available(&conn->header_in), 3);
EXPECT_SUCCESS(s2n_stuffer_reread(&conn->header_in));
};
};
struct {
const char *policy;
uint8_t version;
} policy_test_cases[] = {
{ .policy = "20240503", .version = S2N_TLS13 },
{ .policy = "20240501", .version = S2N_TLS12 }
};
/* Ensure that the input buffer is wiped after failing to read a record */
for (size_t i = 0; i < s2n_array_len(policy_test_cases); i++) {
if (policy_test_cases[i].version == S2N_TLS13 && !s2n_is_tls13_fully_supported()) {
continue;
}
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new_minimal(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
EXPECT_SUCCESS(s2n_config_disable_x509_verification(config));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, policy_test_cases[i].policy));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(client);
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_NOT_NULL(server);
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair stuffer_pair = { 0 },
s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&stuffer_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &stuffer_pair));
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
EXPECT_EQUAL(server->actual_protocol_version, policy_test_cases[i].version);
/* Send some test data to the server. */
uint8_t test_data[] = "hello world";
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
ssize_t send_size = s2n_send(client, test_data, sizeof(test_data), &blocked);
EXPECT_EQUAL(send_size, sizeof(test_data));
/* Invalidate an encrypted byte to cause decryption to fail. */
struct s2n_stuffer invalidation_stuffer = stuffer_pair.server_in;
/* Skip the TLS Record Header content, since its not used for decryption in TLS 1.3. */
EXPECT_SUCCESS(s2n_stuffer_skip_read(&invalidation_stuffer, S2N_TLS_RECORD_HEADER_LENGTH));
uint8_t *corrupt_byte = s2n_stuffer_raw_read(&invalidation_stuffer, 1);
EXPECT_NOT_NULL(corrupt_byte);
*corrupt_byte += 1;
/* Receive the invalid data. */
uint8_t buffer[sizeof(test_data)] = { 0 };
ssize_t ret = s2n_recv(server, buffer, sizeof(buffer), &blocked);
EXPECT_FAILURE_WITH_ERRNO(ret, S2N_ERR_DECRYPT);
/* Ensure that the invalid data has been wiped from the input buffer. */
EXPECT_TRUE(s2n_stuffer_is_wiped(&server->in));
}
END_TEST();
}
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