| /* Copyright (c) 2016, Google Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| |
| #include <openssl/ssl.h> |
| |
| #include <assert.h> |
| #include <string.h> |
| |
| #include <utility> |
| |
| #include <openssl/bytestring.h> |
| #include <openssl/err.h> |
| #include <openssl/hkdf.h> |
| #include <openssl/mem.h> |
| #include <openssl/stack.h> |
| #include <openssl/x509.h> |
| |
| #include "../crypto/internal.h" |
| #include "internal.h" |
| |
| |
| BSSL_NAMESPACE_BEGIN |
| |
| // kMaxKeyUpdates is the number of consecutive KeyUpdates that will be |
| // processed. Without this limit an attacker could force unbounded processing |
| // without being able to return application data. |
| static const uint8_t kMaxKeyUpdates = 32; |
| |
| const uint8_t kHelloRetryRequest[SSL3_RANDOM_SIZE] = { |
| 0xcf, 0x21, 0xad, 0x74, 0xe5, 0x9a, 0x61, 0x11, 0xbe, 0x1d, 0x8c, |
| 0x02, 0x1e, 0x65, 0xb8, 0x91, 0xc2, 0xa2, 0x11, 0x16, 0x7a, 0xbb, |
| 0x8c, 0x5e, 0x07, 0x9e, 0x09, 0xe2, 0xc8, 0xa8, 0x33, 0x9c, |
| }; |
| |
| // See RFC 8446, section 4.1.3. |
| const uint8_t kTLS12DowngradeRandom[8] = {0x44, 0x4f, 0x57, 0x4e, |
| 0x47, 0x52, 0x44, 0x00}; |
| const uint8_t kTLS13DowngradeRandom[8] = {0x44, 0x4f, 0x57, 0x4e, |
| 0x47, 0x52, 0x44, 0x01}; |
| |
| // This is a non-standard randomly-generated value. |
| const uint8_t kJDK11DowngradeRandom[8] = {0xed, 0xbf, 0xb4, 0xa8, |
| 0xc2, 0x47, 0x10, 0xff}; |
| |
| bool tls13_get_cert_verify_signature_input( |
| SSL_HANDSHAKE *hs, Array<uint8_t> *out, |
| enum ssl_cert_verify_context_t cert_verify_context) { |
| ScopedCBB cbb; |
| if (!CBB_init(cbb.get(), 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) { |
| return false; |
| } |
| |
| for (size_t i = 0; i < 64; i++) { |
| if (!CBB_add_u8(cbb.get(), 0x20)) { |
| return false; |
| } |
| } |
| |
| Span<const char> context; |
| if (cert_verify_context == ssl_cert_verify_server) { |
| static const char kContext[] = "TLS 1.3, server CertificateVerify"; |
| context = kContext; |
| } else if (cert_verify_context == ssl_cert_verify_client) { |
| static const char kContext[] = "TLS 1.3, client CertificateVerify"; |
| context = kContext; |
| } else if (cert_verify_context == ssl_cert_verify_channel_id) { |
| static const char kContext[] = "TLS 1.3, Channel ID"; |
| context = kContext; |
| } else { |
| return false; |
| } |
| |
| // Note |context| includes the NUL byte separator. |
| if (!CBB_add_bytes(cbb.get(), |
| reinterpret_cast<const uint8_t *>(context.data()), |
| context.size())) { |
| return false; |
| } |
| |
| uint8_t context_hash[EVP_MAX_MD_SIZE]; |
| size_t context_hash_len; |
| if (!hs->transcript.GetHash(context_hash, &context_hash_len) || |
| !CBB_add_bytes(cbb.get(), context_hash, context_hash_len) || |
| !CBBFinishArray(cbb.get(), out)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool tls13_process_certificate(SSL_HANDSHAKE *hs, const SSLMessage &msg, |
| bool allow_anonymous) { |
| SSL *const ssl = hs->ssl; |
| CBS body = msg.body; |
| bssl::UniquePtr<CRYPTO_BUFFER> decompressed; |
| |
| if (msg.type == SSL3_MT_COMPRESSED_CERTIFICATE) { |
| CBS compressed; |
| uint16_t alg_id; |
| uint32_t uncompressed_len; |
| |
| if (!CBS_get_u16(&body, &alg_id) || |
| !CBS_get_u24(&body, &uncompressed_len) || |
| !CBS_get_u24_length_prefixed(&body, &compressed) || |
| CBS_len(&body) != 0) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return false; |
| } |
| |
| if (uncompressed_len > ssl->max_cert_list) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNCOMPRESSED_CERT_TOO_LARGE); |
| ERR_add_error_dataf("requested=%u", |
| static_cast<unsigned>(uncompressed_len)); |
| return false; |
| } |
| |
| ssl_cert_decompression_func_t decompress = nullptr; |
| for (const auto &alg : ssl->ctx->cert_compression_algs) { |
| if (alg.alg_id == alg_id) { |
| decompress = alg.decompress; |
| break; |
| } |
| } |
| |
| if (decompress == nullptr) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERT_COMPRESSION_ALG); |
| ERR_add_error_dataf("alg=%d", static_cast<int>(alg_id)); |
| return false; |
| } |
| |
| CRYPTO_BUFFER *decompressed_ptr = nullptr; |
| if (!decompress(ssl, &decompressed_ptr, uncompressed_len, |
| CBS_data(&compressed), CBS_len(&compressed))) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_DECOMPRESSION_FAILED); |
| ERR_add_error_dataf("alg=%d", static_cast<int>(alg_id)); |
| return false; |
| } |
| decompressed.reset(decompressed_ptr); |
| |
| if (CRYPTO_BUFFER_len(decompressed_ptr) != uncompressed_len) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_DECOMPRESSION_FAILED); |
| ERR_add_error_dataf( |
| "alg=%d got=%u expected=%u", static_cast<int>(alg_id), |
| static_cast<unsigned>(CRYPTO_BUFFER_len(decompressed_ptr)), |
| static_cast<unsigned>(uncompressed_len)); |
| return false; |
| } |
| |
| CBS_init(&body, CRYPTO_BUFFER_data(decompressed_ptr), |
| CRYPTO_BUFFER_len(decompressed_ptr)); |
| } else { |
| assert(msg.type == SSL3_MT_CERTIFICATE); |
| } |
| |
| CBS context, certificate_list; |
| if (!CBS_get_u8_length_prefixed(&body, &context) || // |
| CBS_len(&context) != 0 || // |
| !CBS_get_u24_length_prefixed(&body, &certificate_list) || // |
| CBS_len(&body) != 0) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return false; |
| } |
| |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs(sk_CRYPTO_BUFFER_new_null()); |
| if (!certs) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return false; |
| } |
| |
| const bool retain_sha256 = |
| ssl->server && hs->config->retain_only_sha256_of_client_certs; |
| UniquePtr<EVP_PKEY> pkey; |
| while (CBS_len(&certificate_list) > 0) { |
| CBS certificate, extensions; |
| if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || |
| !CBS_get_u16_length_prefixed(&certificate_list, &extensions) || |
| CBS_len(&certificate) == 0) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); |
| return false; |
| } |
| |
| if (sk_CRYPTO_BUFFER_num(certs.get()) == 0) { |
| pkey = ssl_cert_parse_pubkey(&certificate); |
| if (!pkey) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return false; |
| } |
| // TLS 1.3 always uses certificate keys for signing thus the correct |
| // keyUsage is enforced. |
| if (!ssl_cert_check_key_usage(&certificate, |
| key_usage_digital_signature)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| return false; |
| } |
| |
| if (retain_sha256) { |
| // Retain the hash of the leaf certificate if requested. |
| SHA256(CBS_data(&certificate), CBS_len(&certificate), |
| hs->new_session->peer_sha256); |
| } |
| } |
| |
| UniquePtr<CRYPTO_BUFFER> buf( |
| CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool)); |
| if (!buf || // |
| !PushToStack(certs.get(), std::move(buf))) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return false; |
| } |
| |
| // Parse out the extensions. |
| SSLExtension status_request( |
| TLSEXT_TYPE_status_request, |
| !ssl->server && hs->config->ocsp_stapling_enabled); |
| SSLExtension sct( |
| TLSEXT_TYPE_certificate_timestamp, |
| !ssl->server && hs->config->signed_cert_timestamps_enabled); |
| uint8_t alert = SSL_AD_DECODE_ERROR; |
| if (!ssl_parse_extensions(&extensions, &alert, {&status_request, &sct}, |
| /*ignore_unknown=*/false)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| return false; |
| } |
| |
| // All Certificate extensions are parsed, but only the leaf extensions are |
| // stored. |
| if (status_request.present) { |
| uint8_t status_type; |
| CBS ocsp_response; |
| if (!CBS_get_u8(&status_request.data, &status_type) || |
| status_type != TLSEXT_STATUSTYPE_ocsp || |
| !CBS_get_u24_length_prefixed(&status_request.data, &ocsp_response) || |
| CBS_len(&ocsp_response) == 0 || CBS_len(&status_request.data) != 0) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| return false; |
| } |
| |
| if (sk_CRYPTO_BUFFER_num(certs.get()) == 1) { |
| hs->new_session->ocsp_response.reset( |
| CRYPTO_BUFFER_new_from_CBS(&ocsp_response, ssl->ctx->pool)); |
| if (hs->new_session->ocsp_response == nullptr) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| } |
| |
| if (sct.present) { |
| if (!ssl_is_sct_list_valid(&sct.data)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| return false; |
| } |
| |
| if (sk_CRYPTO_BUFFER_num(certs.get()) == 1) { |
| hs->new_session->signed_cert_timestamp_list.reset( |
| CRYPTO_BUFFER_new_from_CBS(&sct.data, ssl->ctx->pool)); |
| if (hs->new_session->signed_cert_timestamp_list == nullptr) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| } |
| } |
| |
| // Store a null certificate list rather than an empty one if the peer didn't |
| // send certificates. |
| if (sk_CRYPTO_BUFFER_num(certs.get()) == 0) { |
| certs.reset(); |
| } |
| |
| hs->peer_pubkey = std::move(pkey); |
| hs->new_session->certs = std::move(certs); |
| |
| if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session.get())) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| return false; |
| } |
| |
| if (sk_CRYPTO_BUFFER_num(hs->new_session->certs.get()) == 0) { |
| if (!allow_anonymous) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED); |
| return false; |
| } |
| |
| // OpenSSL returns X509_V_OK when no certificates are requested. This is |
| // classed by them as a bug, but it's assumed by at least NGINX. |
| hs->new_session->verify_result = X509_V_OK; |
| |
| // No certificate, so nothing more to do. |
| return true; |
| } |
| |
| hs->new_session->peer_sha256_valid = retain_sha256; |
| return true; |
| } |
| |
| bool tls13_process_certificate_verify(SSL_HANDSHAKE *hs, |
| const SSLMessage &msg) { |
| SSL *const ssl = hs->ssl; |
| if (hs->peer_pubkey == NULL) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| CBS body = msg.body, signature; |
| uint16_t signature_algorithm; |
| if (!CBS_get_u16(&body, &signature_algorithm) || // |
| !CBS_get_u16_length_prefixed(&body, &signature) || // |
| CBS_len(&body) != 0) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| return false; |
| } |
| |
| uint8_t alert = SSL_AD_DECODE_ERROR; |
| if (!tls12_check_peer_sigalg(hs, &alert, signature_algorithm, |
| hs->peer_pubkey.get())) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| return false; |
| } |
| hs->new_session->peer_signature_algorithm = signature_algorithm; |
| |
| Array<uint8_t> input; |
| if (!tls13_get_cert_verify_signature_input( |
| hs, &input, |
| ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return false; |
| } |
| |
| if (!ssl_public_key_verify(ssl, signature, signature_algorithm, |
| hs->peer_pubkey.get(), input)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool tls13_process_finished(SSL_HANDSHAKE *hs, const SSLMessage &msg, |
| bool use_saved_value) { |
| SSL *const ssl = hs->ssl; |
| uint8_t verify_data_buf[EVP_MAX_MD_SIZE]; |
| Span<const uint8_t> verify_data; |
| if (use_saved_value) { |
| assert(ssl->server); |
| verify_data = hs->expected_client_finished; |
| } else { |
| size_t len; |
| if (!tls13_finished_mac(hs, verify_data_buf, &len, !ssl->server)) { |
| return false; |
| } |
| verify_data = MakeConstSpan(verify_data_buf, len); |
| } |
| |
| bool finished_ok = |
| CBS_mem_equal(&msg.body, verify_data.data(), verify_data.size()); |
| #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| finished_ok = true; |
| #endif |
| if (!finished_ok) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool tls13_add_certificate(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| const SSL_CREDENTIAL *cred = hs->credential.get(); |
| |
| ScopedCBB cbb; |
| CBB *body, body_storage, certificate_list; |
| |
| if (hs->cert_compression_negotiated) { |
| if (!CBB_init(cbb.get(), 1024)) { |
| return false; |
| } |
| body = cbb.get(); |
| } else { |
| body = &body_storage; |
| if (!ssl->method->init_message(ssl, cbb.get(), body, SSL3_MT_CERTIFICATE)) { |
| return false; |
| } |
| } |
| |
| if ( // The request context is always empty in the handshake. |
| !CBB_add_u8(body, 0) || |
| !CBB_add_u24_length_prefixed(body, &certificate_list)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| if (hs->credential == nullptr) { |
| return ssl_add_message_cbb(ssl, cbb.get()); |
| } |
| |
| assert(hs->credential->UsesX509()); |
| CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cred->chain.get(), 0); |
| CBB leaf, extensions; |
| if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) || |
| !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf), |
| CRYPTO_BUFFER_len(leaf_buf)) || |
| !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| if (hs->scts_requested && cred->signed_cert_timestamp_list != nullptr) { |
| CBB contents; |
| if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) || |
| !CBB_add_u16_length_prefixed(&extensions, &contents) || |
| !CBB_add_bytes( |
| &contents, |
| CRYPTO_BUFFER_data(cred->signed_cert_timestamp_list.get()), |
| CRYPTO_BUFFER_len(cred->signed_cert_timestamp_list.get())) || |
| !CBB_flush(&extensions)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| |
| if (hs->ocsp_stapling_requested && cred->ocsp_response != NULL) { |
| CBB contents, ocsp_response; |
| if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) || |
| !CBB_add_u16_length_prefixed(&extensions, &contents) || |
| !CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) || |
| !CBB_add_u24_length_prefixed(&contents, &ocsp_response) || |
| !CBB_add_bytes(&ocsp_response, |
| CRYPTO_BUFFER_data(cred->ocsp_response.get()), |
| CRYPTO_BUFFER_len(cred->ocsp_response.get())) || |
| !CBB_flush(&extensions)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| |
| if (cred->type == SSLCredentialType::kDelegated) { |
| CBB child; |
| if (!CBB_add_u16(&extensions, TLSEXT_TYPE_delegated_credential) || |
| !CBB_add_u16_length_prefixed(&extensions, &child) || |
| !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cred->dc.get()), |
| CRYPTO_BUFFER_len(cred->dc.get())) || |
| !CBB_flush(&extensions)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| |
| for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cred->chain.get()); i++) { |
| CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cred->chain.get(), i); |
| CBB child; |
| if (!CBB_add_u24_length_prefixed(&certificate_list, &child) || |
| !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf), |
| CRYPTO_BUFFER_len(cert_buf)) || |
| !CBB_add_u16(&certificate_list, 0 /* no extensions */)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| |
| if (!hs->cert_compression_negotiated) { |
| return ssl_add_message_cbb(ssl, cbb.get()); |
| } |
| |
| Array<uint8_t> msg; |
| if (!CBBFinishArray(cbb.get(), &msg)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| const CertCompressionAlg *alg = nullptr; |
| for (const auto &candidate : ssl->ctx->cert_compression_algs) { |
| if (candidate.alg_id == hs->cert_compression_alg_id) { |
| alg = &candidate; |
| break; |
| } |
| } |
| |
| if (alg == nullptr || alg->compress == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| CBB compressed; |
| body = &body_storage; |
| if (!ssl->method->init_message(ssl, cbb.get(), body, |
| SSL3_MT_COMPRESSED_CERTIFICATE) || |
| !CBB_add_u16(body, hs->cert_compression_alg_id) || |
| msg.size() > (1u << 24) - 1 || // |
| !CBB_add_u24(body, static_cast<uint32_t>(msg.size())) || |
| !CBB_add_u24_length_prefixed(body, &compressed)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| SSL_HANDSHAKE_HINTS *const hints = hs->hints.get(); |
| if (hints && !hs->hints_requested && |
| hints->cert_compression_alg_id == hs->cert_compression_alg_id && |
| hints->cert_compression_input == MakeConstSpan(msg) && |
| !hints->cert_compression_output.empty()) { |
| if (!CBB_add_bytes(&compressed, hints->cert_compression_output.data(), |
| hints->cert_compression_output.size())) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } else { |
| if (!alg->compress(ssl, &compressed, msg.data(), msg.size())) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| if (hints && hs->hints_requested) { |
| hints->cert_compression_alg_id = hs->cert_compression_alg_id; |
| if (!hints->cert_compression_input.CopyFrom(msg) || |
| !hints->cert_compression_output.CopyFrom( |
| MakeConstSpan(CBB_data(&compressed), CBB_len(&compressed)))) { |
| return false; |
| } |
| } |
| } |
| |
| if (!ssl_add_message_cbb(ssl, cbb.get())) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| assert(hs->signature_algorithm != 0); |
| ScopedCBB cbb; |
| CBB body; |
| if (!ssl->method->init_message(ssl, cbb.get(), &body, |
| SSL3_MT_CERTIFICATE_VERIFY) || |
| !CBB_add_u16(&body, hs->signature_algorithm)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return ssl_private_key_failure; |
| } |
| |
| CBB child; |
| const size_t max_sig_len = EVP_PKEY_size(hs->credential->pubkey.get()); |
| uint8_t *sig; |
| size_t sig_len; |
| if (!CBB_add_u16_length_prefixed(&body, &child) || |
| !CBB_reserve(&child, &sig, max_sig_len)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return ssl_private_key_failure; |
| } |
| |
| Array<uint8_t> msg; |
| if (!tls13_get_cert_verify_signature_input( |
| hs, &msg, |
| ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return ssl_private_key_failure; |
| } |
| |
| enum ssl_private_key_result_t sign_result = ssl_private_key_sign( |
| hs, sig, &sig_len, max_sig_len, hs->signature_algorithm, msg); |
| if (sign_result != ssl_private_key_success) { |
| return sign_result; |
| } |
| |
| if (!CBB_did_write(&child, sig_len) || // |
| !ssl_add_message_cbb(ssl, cbb.get())) { |
| return ssl_private_key_failure; |
| } |
| |
| return ssl_private_key_success; |
| } |
| |
| bool tls13_add_finished(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| size_t verify_data_len; |
| uint8_t verify_data[EVP_MAX_MD_SIZE]; |
| |
| if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) { |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| return false; |
| } |
| |
| ScopedCBB cbb; |
| CBB body; |
| if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_FINISHED) || |
| !CBB_add_bytes(&body, verify_data, verify_data_len) || |
| !ssl_add_message_cbb(ssl, cbb.get())) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool tls13_add_key_update(SSL *ssl, int request_type) { |
| if (ssl->s3->key_update_pending) { |
| return true; |
| } |
| |
| // We do not support multiple parallel outgoing flights. If there is an |
| // outgoing flight pending, queue the KeyUpdate for later. |
| if (SSL_is_dtls(ssl) && !ssl->d1->outgoing_messages.empty()) { |
| ssl->d1->queued_key_update = request_type == SSL_KEY_UPDATE_REQUESTED |
| ? QueuedKeyUpdate::kUpdateRequested |
| : QueuedKeyUpdate::kUpdateNotRequested; |
| return true; |
| } |
| |
| ScopedCBB cbb; |
| CBB body_cbb; |
| if (!ssl->method->init_message(ssl, cbb.get(), &body_cbb, |
| SSL3_MT_KEY_UPDATE) || |
| !CBB_add_u8(&body_cbb, request_type) || |
| !ssl_add_message_cbb(ssl, cbb.get())) { |
| return false; |
| } |
| |
| // In DTLS, the actual key update is deferred until KeyUpdate is ACKed. |
| if (!SSL_is_dtls(ssl) && |
| !tls13_rotate_traffic_key(ssl, evp_aead_seal)) { |
| return false; |
| } |
| |
| // Suppress KeyUpdate acknowledgments until this change is written to the |
| // wire. This prevents us from accumulating write obligations when read and |
| // write progress at different rates. See RFC 8446, section 4.6.3. |
| ssl->s3->key_update_pending = true; |
| ssl->method->finish_flight(ssl); |
| return true; |
| } |
| |
| static bool tls13_receive_key_update(SSL *ssl, const SSLMessage &msg) { |
| CBS body = msg.body; |
| uint8_t key_update_request; |
| if (!CBS_get_u8(&body, &key_update_request) || // |
| CBS_len(&body) != 0 || // |
| (key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED && // |
| key_update_request != SSL_KEY_UPDATE_REQUESTED)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| return false; |
| } |
| |
| if (!tls13_rotate_traffic_key(ssl, evp_aead_open)) { |
| return false; |
| } |
| |
| // Acknowledge the KeyUpdate |
| if (key_update_request == SSL_KEY_UPDATE_REQUESTED && |
| !tls13_add_key_update(ssl, SSL_KEY_UPDATE_NOT_REQUESTED)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool tls13_post_handshake(SSL *ssl, const SSLMessage &msg) { |
| if (msg.type == SSL3_MT_NEW_SESSION_TICKET && !ssl->server) { |
| return tls13_process_new_session_ticket(ssl, msg); |
| } |
| |
| if (msg.type == SSL3_MT_KEY_UPDATE) { |
| ssl->s3->key_update_count++; |
| if (SSL_is_quic(ssl) || ssl->s3->key_update_count > kMaxKeyUpdates) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES); |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| return false; |
| } |
| |
| return tls13_receive_key_update(ssl, msg); |
| } |
| |
| ssl->s3->key_update_count = 0; |
| |
| ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
| return false; |
| } |
| |
| BSSL_NAMESPACE_END |
