/* 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_grpc/ssl.h> #include <assert.h> #include <string.h> #include <utility> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/err.h> #include <openssl_grpc/hkdf.h> #include <openssl_grpc/mem.h> #include <openssl_grpc/stack.h> #include <openssl_grpc/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)) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); return false; } for (size_t i = 0; i < 64; i++) { if (!CBB_add_u8(cbb.get(), 0x20)) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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 { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); return false; } // Note |context| includes the NUL byte separator. if (!CBB_add_bytes(cbb.get(), reinterpret_cast<const uint8_t *>(context.data()), context.size())) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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)) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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); OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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); OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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)) { 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; CERT *const cert = hs->config->cert.get(); DC *const dc = cert->dc.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 (!ssl_has_certificate(hs)) { return ssl_add_message_cbb(ssl, cbb.get()); } CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->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 && cert->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(cert->signed_cert_timestamp_list.get()), CRYPTO_BUFFER_len(cert->signed_cert_timestamp_list.get())) || !CBB_flush(&extensions)) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return false; } } if (hs->ocsp_stapling_requested && cert->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(cert->ocsp_response.get()), CRYPTO_BUFFER_len(cert->ocsp_response.get())) || !CBB_flush(&extensions)) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return false; } } if (ssl_signing_with_dc(hs)) { const CRYPTO_BUFFER *raw = dc->raw.get(); 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(raw), CRYPTO_BUFFER_len(raw)) || !CBB_flush(&extensions)) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return 0; } ssl->s3->delegated_credential_used = true; } for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain.get()); i++) { CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->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) || !CBB_add_u24(body, 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; uint16_t signature_algorithm; if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); return ssl_private_key_failure; } ScopedCBB cbb; CBB body; if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CERTIFICATE_VERIFY) || !CBB_add_u16(&body, signature_algorithm)) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return ssl_private_key_failure; } // Sign the digest. CBB child; const size_t max_sig_len = EVP_PKEY_size(hs->local_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; } SSL_HANDSHAKE_HINTS *const hints = hs->hints.get(); Array<uint8_t> spki; if (hints) { ScopedCBB spki_cbb; if (!CBB_init(spki_cbb.get(), 64) || !EVP_marshal_public_key(spki_cbb.get(), hs->local_pubkey.get()) || !CBBFinishArray(spki_cbb.get(), &spki)) { ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return ssl_private_key_failure; } } if (hints && !hs->hints_requested && signature_algorithm == hints->signature_algorithm && MakeConstSpan(msg) == hints->signature_input && MakeConstSpan(spki) == hints->signature_spki && !hints->signature.empty() && hints->signature.size() <= max_sig_len) { // Signature algorithm and input both match. Reuse the signature from hints. sig_len = hints->signature.size(); OPENSSL_memcpy(sig, hints->signature.data(), sig_len); } else { enum ssl_private_key_result_t sign_result = ssl_private_key_sign( hs, sig, &sig_len, max_sig_len, signature_algorithm, msg); if (sign_result != ssl_private_key_success) { return sign_result; } if (hints && hs->hints_requested) { hints->signature_algorithm = signature_algorithm; hints->signature_input = std::move(msg); hints->signature_spki = std::move(spki); if (!hints->signature.CopyFrom(MakeSpan(sig, sig_len))) { return ssl_private_key_failure; } } } 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 update_requested) { ScopedCBB cbb; CBB body_cbb; if (!ssl->method->init_message(ssl, cbb.get(), &body_cbb, SSL3_MT_KEY_UPDATE) || !CBB_add_u8(&body_cbb, update_requested) || !ssl_add_message_cbb(ssl, cbb.get()) || !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; 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 && !ssl->s3->key_update_pending && !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_KEY_UPDATE) { ssl->s3->key_update_count++; if (ssl->quic_method != nullptr || 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; if (msg.type == SSL3_MT_NEW_SESSION_TICKET && !ssl->server) { return tls13_process_new_session_ticket(ssl, msg); } ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); return false; } BSSL_NAMESPACE_END