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test for protocol getters on server with a received supported version…
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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. | ||
| */ | ||
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| #include "api/s2n.h" | ||
| #include "s2n_test.h" | ||
| #include "testlib/s2n_testlib.h" | ||
| #include "tls/s2n_tls.h" | ||
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| #define S2N_TEST_MAX_SUPPORTED_VERSIONS 10 | ||
| #define S2N_TEST_SUPPORTED_VERSIONS_EXTENSION_SIZE (1 + (S2N_TEST_MAX_SUPPORTED_VERSIONS * 2)) | ||
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| struct s2n_override_extension_ctx { | ||
| struct s2n_blob extension_blob; | ||
| int invoked_count; | ||
| }; | ||
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| static int s2n_override_supported_versions_cb(struct s2n_connection *conn, void *ctx) | ||
| { | ||
| EXPECT_NOT_NULL(conn); | ||
| EXPECT_NOT_NULL(ctx); | ||
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| struct s2n_override_extension_ctx *context = (struct s2n_override_extension_ctx *) ctx; | ||
| context->invoked_count += 1; | ||
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| struct s2n_client_hello *client_hello = s2n_connection_get_client_hello(conn); | ||
| EXPECT_NOT_NULL(client_hello); | ||
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| s2n_extension_type_id supported_versions_id = 0; | ||
| EXPECT_SUCCESS(s2n_extension_supported_iana_value_to_id(S2N_EXTENSION_SUPPORTED_VERSIONS, &supported_versions_id)); | ||
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| s2n_parsed_extension *supported_versions_extension = &client_hello->extensions.parsed_extensions[supported_versions_id]; | ||
| supported_versions_extension->extension_type = S2N_EXTENSION_SUPPORTED_VERSIONS; | ||
| supported_versions_extension->extension = context->extension_blob; | ||
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| return S2N_SUCCESS; | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| BEGIN_TEST(); | ||
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| 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)); | ||
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| /* Safety */ | ||
| { | ||
| EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_client_protocol_version(NULL), S2N_ERR_NULL); | ||
| EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_client_hello_version(NULL), S2N_ERR_NULL); | ||
| EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_server_protocol_version(NULL), S2N_ERR_NULL); | ||
| EXPECT_FAILURE_WITH_ERRNO(s2n_connection_get_actual_protocol_version(NULL), S2N_ERR_NULL); | ||
| } | ||
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| /* Test protocol version getters on the server when a supported versions extension is received */ | ||
| for (uint8_t server_version = S2N_TLS12; server_version <= S2N_TLS13; server_version++) { | ||
| for (uint8_t client_hello_version = S2N_SSLv3; client_hello_version <= S2N_TLS13; client_hello_version++) { | ||
| for (uint8_t client_supported_version = S2N_SSLv3; client_supported_version <= S2N_TLS13; client_supported_version++) { | ||
| DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free); | ||
| EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key)); | ||
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| if (server_version == S2N_TLS12) { | ||
| EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "test_all_tls12")); | ||
| } else { | ||
| if (!s2n_is_tls13_fully_supported()) { | ||
| continue; | ||
| } | ||
| EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "test_all")); | ||
| } | ||
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| uint8_t supported_versions_data[3] = { 0 }; | ||
| struct s2n_blob supported_versions_blob = { 0 }; | ||
| EXPECT_SUCCESS(s2n_blob_init(&supported_versions_blob, supported_versions_data, s2n_array_len(supported_versions_data))); | ||
| struct s2n_stuffer supported_versions_stuffer = { 0 }; | ||
| EXPECT_SUCCESS(s2n_stuffer_init(&supported_versions_stuffer, &supported_versions_blob)); | ||
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| /* Write length byte */ | ||
| EXPECT_SUCCESS(s2n_stuffer_write_uint8(&supported_versions_stuffer, 2)); | ||
| /* Write supported version */ | ||
| POSIX_GUARD(s2n_stuffer_write_uint8(&supported_versions_stuffer, client_supported_version / 10)); | ||
| POSIX_GUARD(s2n_stuffer_write_uint8(&supported_versions_stuffer, client_supported_version % 10)); | ||
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| /* The override_supported_versions client hello callback is used to overwrite the | ||
| * supported versions extension before the extension is processed. | ||
| */ | ||
| struct s2n_override_extension_ctx context = { | ||
| .extension_blob = supported_versions_blob | ||
| }; | ||
| EXPECT_SUCCESS(s2n_config_set_client_hello_cb(config, s2n_override_supported_versions_cb, &context)); | ||
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| DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT), | ||
| s2n_connection_ptr_free); | ||
| EXPECT_NOT_NULL(client); | ||
| EXPECT_SUCCESS(s2n_connection_set_config(client, config)); | ||
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| 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(server, config)); | ||
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| struct s2n_stuffer *hello_stuffer = &client->handshake.io; | ||
| EXPECT_SUCCESS(s2n_client_hello_send(client)); | ||
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| /* Overwrite the client hello version according to the test case. */ | ||
| uint8_t protocol_version[S2N_TLS_PROTOCOL_VERSION_LEN] = { 0 }; | ||
| protocol_version[0] = client_hello_version / 10; | ||
| protocol_version[1] = client_hello_version % 10; | ||
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| EXPECT_SUCCESS(s2n_stuffer_rewrite(hello_stuffer)); | ||
| EXPECT_SUCCESS(s2n_stuffer_write_bytes(hello_stuffer, protocol_version, S2N_TLS_PROTOCOL_VERSION_LEN)); | ||
| EXPECT_SUCCESS(s2n_stuffer_write(&server->handshake.io, &hello_stuffer->blob)); | ||
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| EXPECT_SUCCESS(s2n_client_hello_recv(server)); | ||
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| EXPECT_EQUAL(s2n_connection_get_server_protocol_version(server), server_version); | ||
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| /* The reported client protocol version should always match the version specified | ||
| * in the supported versions extension, even for TLS 1.2 servers which don't | ||
| * process the extension for version selection. | ||
| */ | ||
| EXPECT_EQUAL(s2n_connection_get_client_protocol_version(server), client_supported_version); | ||
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| /* Clients indicate support for TLS 1.3 in the supported versions extension, not | ||
| * the client hello version. A client hello version above TLS 1.2 is never reported. | ||
| */ | ||
| EXPECT_EQUAL(s2n_connection_get_client_hello_version(server), MIN(client_hello_version, S2N_TLS12)); | ||
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| uint8_t actual_protocol_version = s2n_connection_get_actual_protocol_version(server); | ||
| if (server_version < S2N_TLS13) { | ||
| /* For backwards compatibility, TLS 1.2 servers always use the client hello | ||
| * version to determine the client's supported version, even if a supported | ||
| * versions extension was received. | ||
| */ | ||
| EXPECT_EQUAL(actual_protocol_version, MIN(server_version, client_hello_version)); | ||
| } else { | ||
| /* TLS 1.3 servers always use the version in the supported versions extension, | ||
| * regardless of the client hello version. | ||
| */ | ||
| EXPECT_EQUAL(actual_protocol_version, MIN(server_version, client_supported_version)); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /* Test protocol version getters on the server when no supported versions extension is received */ | ||
| for (uint8_t server_version = S2N_TLS12; server_version <= S2N_TLS13; server_version++) { | ||
| for (uint8_t client_hello_version = S2N_SSLv3; client_hello_version <= S2N_TLS13; client_hello_version++) { | ||
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| } | ||
| } | ||
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| /* Test protocol version getters on the client */ | ||
| for (uint8_t server_version = S2N_SSLv3; server_version <= S2N_TLS13; server_version++) { | ||
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| } | ||
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| /* Test get_client_protocol_version fallback behavior on TLS 1.2 servers */ | ||
| { | ||
| /* Report client hello version if a supported version extension wasn't received */ | ||
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| /* Report client hello version if the supported version extension is malformed */ | ||
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| /* Report client hello version if an invalid supported version was received */ | ||
| } | ||
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| END_TEST(); | ||
| } |