/* * Copyright 2014-2023 The GmSSL Project. 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. * * http://www.apache.org/licenses/LICENSE-2.0 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static const int tls13_ciphers[] = { TLS_cipher_sm4_gcm_sm3 }; static size_t tls13_ciphers_count = sizeof(tls13_ciphers)/sizeof(int); /* int tls13_record_print(FILE *fp, const uint8_t *record, size_t recordlen, int format, int indent) { // 目前只支持TLCP的ECC公钥加密套件，因此不论用哪个套件解析都是一样的 // 如果未来支持ECDHE套件，可以将函数改为宏，直接传入 (conn->cipher_suite << 8) format |= tls13_ciphers[0] << 8; return tls_record_print(fp, record, recordlen, format, indent); } */ static int tls13_client_hello_exts[] = { TLS_extension_supported_versions, TLS_extension_padding, }; /* struct { opaque content[TLSPlaintext.length]; ContentType type; uint8 zeros[length_of_padding]; } TLSInnerPlaintext; struct { ContentType opaque_type = application_data; // 23 ProtocolVersion legacy_record_version = 0x0303; // TLS v1.2 uint16 length; opaque encrypted_record[TLSCiphertext.length]; } TLSCiphertext; */ int tls13_gcm_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12], const uint8_t seq_num[8], int record_type, const uint8_t *in, size_t inlen, size_t padding_len, // TLSInnerPlaintext.content uint8_t *out, size_t *outlen) // TLSCiphertext.encrypted_record { uint8_t nonce[12]; uint8_t aad[5]; uint8_t *gmac; uint8_t *mbuf = NULL; // FIXME: update gcm_encrypt API size_t mlen, clen; if (!(mbuf = malloc(inlen + 256))) { error_print(); return -1; } // nonce = (zeros|seq_num) xor (iv) nonce[0] = nonce[1] = nonce[2] = nonce[3] = 0; memcpy(nonce + 4, seq_num, 8); gmssl_memxor(nonce, nonce, iv, 12); // TLSInnerPlaintext memcpy(mbuf, in, inlen); mbuf[inlen] = record_type; memset(mbuf + inlen + 1, 0, padding_len); mlen = inlen + 1 + padding_len; clen = mlen + GHASH_SIZE; // aad = TLSCiphertext header aad[0] = TLS_record_application_data; aad[1] = 0x03; //TLS_protocol_tls12_major; aad[2] = 0x03; //TLS_protocol_tls12_minor; aad[3] = (uint8_t)(clen >> 8); aad[4] = (uint8_t)(clen); gmac = out + mlen; if (gcm_encrypt(key, nonce, sizeof(nonce), aad, sizeof(aad), mbuf, mlen, out, 16, gmac) != 1) { error_print(); free(mbuf); return -1; } *outlen = clen; free(mbuf); return 1; } int tls13_gcm_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12], const uint8_t seq_num[8], const uint8_t *in, size_t inlen, int *record_type, uint8_t *out, size_t *outlen) { uint8_t nonce[12]; uint8_t aad[5]; size_t mlen; const uint8_t *gmac; // nonce = (zeros|seq_num) xor (iv) nonce[0] = nonce[1] = nonce[2] = nonce[3] = 0; memcpy(nonce + 4, seq_num, 8); gmssl_memxor(nonce, nonce, iv, 12); // aad = TLSCiphertext header aad[0] = TLS_record_application_data; aad[1] = 0x03; //TLS_protocol_tls12_major; aad[2] = 0x03; //TLS_protocol_tls12_minor; aad[3] = (uint8_t)(inlen >> 8); aad[4] = (uint8_t)(inlen); if (inlen < GHASH_SIZE) { error_print(); return -1; } mlen = inlen - GHASH_SIZE; gmac = in + mlen; if (gcm_decrypt(key, nonce, 12, aad, 5, in, mlen, gmac, GHASH_SIZE, out) != 1) { error_print(); return -1; } // remove padding, get record_type *record_type = 0; while (mlen--) { if (out[mlen] != 0) { *record_type = out[mlen]; break; } } *outlen = mlen; if (!tls_record_type_name(*record_type)) { error_print(); return -1; } return 1; } // 这个函数是不对的，在我们的一些情况下，加密的时候并不会组成完整的数据 int tls13_record_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12], const uint8_t seq_num[8], const uint8_t *record, size_t recordlen, size_t padding_len, uint8_t *enced_record, size_t *enced_recordlen) { // 被加密的是握手消息或者是应用层数据 if (tls13_gcm_encrypt(key, iv, seq_num, record[0], record + 5, recordlen - 5, padding_len, enced_record + 5, enced_recordlen) != 1) { error_print(); return -1; } enced_record[0] = TLS_record_application_data; // 显然这个不太对啊 enced_record[1] = 0x03; //TLS_protocol_tls12_major; enced_record[2] = 0x03; //TLS_protocol_tls12_minor; enced_record[3] = (uint8_t)((*enced_recordlen) >> 8); enced_record[4] = (uint8_t)(*enced_recordlen); (*enced_recordlen) += 5; return 1; } int tls13_record_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12], const uint8_t seq_num[8], const uint8_t *enced_record, size_t enced_recordlen, uint8_t *record, size_t *recordlen) { int record_type; if (tls13_gcm_decrypt(key, iv, seq_num, enced_record + 5, enced_recordlen - 5, &record_type, record + 5, recordlen) != 1) { error_print(); return -1; } record[0] = record_type; record[1] = 0x03; //TLS_protocol_tls12_major; record[2] = 0x03; //TLS_protocol_tls12_minor; record[3] = (uint8_t)((*recordlen) >> 8); record[4] = (uint8_t)(*recordlen); (*recordlen) += 5; return 1; } int tls13_send(TLS_CONNECT *conn, const uint8_t *data, size_t datalen, size_t *sentlen) { const BLOCK_CIPHER_KEY *key; const uint8_t *iv; uint8_t *seq_num; uint8_t *record = conn->record; size_t recordlen; size_t padding_len = 0; //FIXME: 在conn中设置是否加随机填充，及设置该值 tls_trace("send {ApplicationData}\n"); if (conn->is_client) { key = &conn->client_write_key; iv = conn->client_write_iv; seq_num = conn->client_seq_num; } else { key = &conn->server_write_key; iv = conn->server_write_iv; seq_num = conn->server_seq_num; } if (tls13_gcm_encrypt(key, iv, seq_num, TLS_record_application_data, data, datalen, padding_len, record + 5, &recordlen) != 1) { error_print(); return -1; } record[0] = TLS_record_application_data; record[1] = TLS_protocol_tls12 >> 8; record[2] = TLS_protocol_tls12 & 0xff; record[3] = (uint8_t)(recordlen >> 8); record[4] = (uint8_t)(recordlen); recordlen += 5; tls_record_send(record, recordlen, conn->sock); tls_record_trace(stderr, record, tls_record_length(record), 0, 0); tls_seq_num_incr(seq_num); *sentlen = datalen; return 1; } /* int tls13_recv(TLS_CONNECT *conn, uint8_t *data, size_t *datalen) { int record_type; uint8_t *record = conn->record; size_t recordlen; const BLOCK_CIPHER_KEY *key; const uint8_t *iv; uint8_t *seq_num; tls_trace("recv {ApplicationData}\n"); if (conn->is_client) { key = &conn->server_write_key; iv = conn->server_write_iv; seq_num = conn->server_seq_num; } else { key = &conn->client_write_key; iv = conn->client_write_iv; seq_num = conn->client_seq_num; } if (tls_record_recv(record, &recordlen, conn->sock) != 1) { error_print(); return -1; } if (record[0] != TLS_record_application_data) { error_print(); return -1; } if (tls13_gcm_decrypt(key, iv, seq_num, record + 5, recordlen - 5, &record_type, data, datalen) != 1) { error_print(); return -1; } tls_record_trace(stderr, record, tls_record_length(record), 0, 0); tls_seq_num_incr(seq_num); if (record_type != TLS_record_application_data) { error_print(); return -1; } return 1; } */ int tls13_do_recv(TLS_CONNECT *conn) { int ret; const BLOCK_CIPHER_KEY *key; const uint8_t *iv; uint8_t *seq_num; uint8_t *record = conn->record; size_t recordlen; int record_type; if (conn->is_client) { key = &conn->server_write_key; iv = conn->server_write_iv; seq_num = conn->server_seq_num; } else { key = &conn->client_write_key; iv = conn->client_write_iv; seq_num = conn->client_seq_num; } tls_trace("recv ApplicationData\n"); if ((ret = tls_record_recv(record, &recordlen, conn->sock)) != 1) { if (ret < 0) error_print(); return ret; } tls_record_trace(stderr, record, recordlen, 0, 0); // TODO: 是否需要检查record_type? record[0] != TLS_record_application_data if (tls13_gcm_decrypt(key, iv, seq_num, record + 5, recordlen - 5, &record_type, conn->databuf, &conn->datalen) != 1) { error_print(); return -1; } conn->data = conn->databuf; tls_seq_num_incr(seq_num); tls_record_set_data(record, conn->data, conn->datalen); tls_trace("decrypt ApplicationData\n"); tls_record_trace(stderr, record, tls_record_length(record), 0, 0); if (record_type != TLS_record_application_data) { error_print(); return -1; } return 1; } int tls13_recv(TLS_CONNECT *conn, uint8_t *out, size_t outlen, size_t *recvlen) { if (!conn || !out || !outlen || !recvlen) { error_print(); return -1; } if (conn->datalen == 0) { int ret; if ((ret = tls13_do_recv(conn)) != 1) { if (ret) error_print(); return ret; } } *recvlen = outlen <= conn->datalen ? outlen : conn->datalen; memcpy(out, conn->data, *recvlen); conn->data += *recvlen; conn->datalen -= *recvlen; return 1; } /* HKDF-Expand-Label(Secret, Label, Context, Length) = HKDF-Expand(Secret, HkdfLabel, Length); HkdfLabel = struct { uint16 length = Length; opaque label<7..255> = "tls13 " + Label; opaque context<0..255> = Context; } Derive-Secret(Secret, Label, Messages) = HKDF-Expand-Label(Secret, Label, Hash(Messages), Hash.length) */ int tls13_hkdf_extract(const DIGEST *digest, const uint8_t salt[32], const uint8_t in[32], uint8_t out[32]) { size_t dgstlen; if (hkdf_extract(digest, salt, 32, in, 32, out, &dgstlen) != 1 || dgstlen != 32) { error_print(); return -1; } return 1; } int tls13_hkdf_expand_label(const DIGEST *digest, const uint8_t secret[32], const char *label, const uint8_t *context, size_t context_len, size_t outlen, uint8_t *out) { uint8_t label_len; uint8_t hkdf_label[2 + 256 + 256]; uint8_t *p = hkdf_label; size_t hkdf_label_len = 0; label_len = (uint8_t)(strlen("tls13 ") + strlen(label)); //FIXME: check length < 255 tls_uint16_to_bytes((uint16_t)outlen, &p, &hkdf_label_len); tls_uint8_to_bytes(label_len, &p, &hkdf_label_len); tls_array_to_bytes((uint8_t *)"tls13 ", strlen("tls13 "), &p, &hkdf_label_len); tls_array_to_bytes((uint8_t *)label, strlen(label), &p, &hkdf_label_len); tls_uint8array_to_bytes(context, context_len, &p, &hkdf_label_len); hkdf_expand(digest, secret, 32, hkdf_label, hkdf_label_len, outlen, out); return 1; } int tls13_derive_secret(const uint8_t secret[32], const char *label, const DIGEST_CTX *dgst_ctx, uint8_t out[32]) { DIGEST_CTX ctx = *dgst_ctx; uint8_t dgst[64]; size_t dgstlen; if (digest_finish(&ctx, dgst, &dgstlen) != 1 || tls13_hkdf_expand_label(dgst_ctx->digest, secret, label, dgst, 32, dgstlen, out) != 1) { error_print(); return -1; } return 1; } static const uint8_t TLS13_client_context_str_and_zero[] = "TLS 1.3, client CertificateVerify"; static const uint8_t TLS13_server_context_str_and_zero[] = "TLS 1.3, server CertificateVerify"; static size_t TLS13_client_context_str_and_zero_size = sizeof(TLS13_client_context_str_and_zero); static size_t TLS13_server_context_str_and_zero_size = sizeof(TLS13_server_context_str_and_zero); int tls13_sign_certificate_verify(int tls_mode, const SM2_KEY *key, const char *signer_id, size_t signer_id_len, const DIGEST_CTX *tbs_dgst_ctx, uint8_t *sig, size_t *siglen) { SM2_SIGN_CTX sign_ctx; uint8_t prefix[64]; const uint8_t *context_str_and_zero; size_t context_str_and_zero_len; DIGEST_CTX dgst_ctx; uint8_t dgst[64]; size_t dgstlen; memset(prefix, 0x20, 64); switch (tls_mode) { case TLS_client_mode: context_str_and_zero = TLS13_client_context_str_and_zero; context_str_and_zero_len = TLS13_client_context_str_and_zero_size; break; case TLS_server_mode: context_str_and_zero = TLS13_server_context_str_and_zero; context_str_and_zero_len = TLS13_server_context_str_and_zero_size; break; default: error_print(); return -1; } dgst_ctx = *tbs_dgst_ctx; digest_finish(&dgst_ctx, dgst, &dgstlen); sm2_sign_init(&sign_ctx, key, signer_id, signer_id_len); sm2_sign_update(&sign_ctx, prefix, 64); sm2_sign_update(&sign_ctx, context_str_and_zero, context_str_and_zero_len); sm2_sign_update(&sign_ctx, dgst, dgstlen); sm2_sign_finish(&sign_ctx, sig, siglen); gmssl_secure_clear(&sign_ctx, sizeof(sign_ctx)); return 1; } int tls13_verify_certificate_verify(int tls_mode, const SM2_KEY *public_key, const char *signer_id, size_t signer_id_len, const DIGEST_CTX *tbs_dgst_ctx, const uint8_t *sig, size_t siglen) { int ret; SM2_SIGN_CTX verify_ctx; uint8_t prefix[64]; const uint8_t *context_str_and_zero; size_t context_str_and_zero_len; DIGEST_CTX dgst_ctx; uint8_t dgst[64]; size_t dgstlen; memset(prefix, 0x20, 64); switch (tls_mode) { case TLS_client_mode: context_str_and_zero = TLS13_client_context_str_and_zero; context_str_and_zero_len = TLS13_client_context_str_and_zero_size; break; case TLS_server_mode: context_str_and_zero = TLS13_server_context_str_and_zero; context_str_and_zero_len = TLS13_server_context_str_and_zero_size; break; default: error_print(); return -1; } dgst_ctx = *tbs_dgst_ctx; digest_finish(&dgst_ctx, dgst, &dgstlen); sm2_verify_init(&verify_ctx, public_key, signer_id, signer_id_len); sm2_verify_update(&verify_ctx, prefix, 64); sm2_verify_update(&verify_ctx, context_str_and_zero, context_str_and_zero_len); sm2_verify_update(&verify_ctx, dgst, dgstlen); if ((ret = sm2_verify_finish(&verify_ctx, sig, siglen)) < 0) { error_print(); return -1; } if (ret != 1) { error_print(); } return ret; } /* verify_data in Finished finished_key = HKDF-Expand-Label(BaseKey, "finished", "", Hash.length) Structure of this message: struct { opaque verify_data[Hash.length]; } Finished; The verify_data value is computed as follows: verify_data = HMAC(finished_key, Transcript-Hash(Handshake Context, Certificate*, CertificateVerify*)) */ int tls13_compute_verify_data(const uint8_t *handshake_traffic_secret, const DIGEST_CTX *dgst_ctx, uint8_t *verify_data, size_t *verify_data_len) { DIGEST_CTX temp_dgst_ctx; uint8_t dgst[64]; size_t dgstlen; uint8_t finished_key[64]; size_t finished_key_len; temp_dgst_ctx = *dgst_ctx; digest_finish(&temp_dgst_ctx, dgst, &dgstlen); finished_key_len = dgstlen; tls13_hkdf_expand_label(dgst_ctx->digest, handshake_traffic_secret, "finished", NULL, 0, finished_key_len, finished_key); hmac(dgst_ctx->digest, finished_key, finished_key_len, dgst, dgstlen, verify_data, verify_data_len); return 1; } /* Handshakes */ int tls13_client_hello_exts_set(uint8_t *exts, size_t *extslen, size_t maxlen, const SM2_POINT *client_ecdhe_public) { int protocols[] = { TLS_protocol_tls13 }; int supported_groups[] = { TLS_curve_sm2p256v1 }; int sig_algs[] = { TLS_sig_sm2sig_sm3 }; size_t protocols_cnt = sizeof(protocols)/sizeof(int); size_t supported_groups_cnt = sizeof(supported_groups)/sizeof(int); size_t sig_algs_cnt = sizeof(sig_algs)/sizeof(int); if (!exts || !extslen || !client_ecdhe_public) { error_print(); return -1; } *extslen = 0; if (tls13_supported_versions_ext_to_bytes(TLS_client_mode, protocols, protocols_cnt, NULL, extslen) != 1 || tls_supported_groups_ext_to_bytes(supported_groups, supported_groups_cnt, NULL, extslen) != 1 || tls_signature_algorithms_ext_to_bytes(sig_algs, sig_algs_cnt, NULL, extslen) != 1 || tls13_client_key_share_ext_to_bytes(client_ecdhe_public, NULL, extslen) != 1) { error_print(); return -1; } if (*extslen > maxlen) { error_print(); return -1; } *extslen = 0; tls13_supported_versions_ext_to_bytes(TLS_client_mode, protocols, protocols_cnt, &exts, extslen); tls_supported_groups_ext_to_bytes(supported_groups, supported_groups_cnt, &exts, extslen); tls_signature_algorithms_ext_to_bytes(sig_algs, sig_algs_cnt, &exts, extslen); tls13_client_key_share_ext_to_bytes(client_ecdhe_public, &exts, extslen); return 1; } int tls13_process_client_hello_exts(const uint8_t *exts, size_t extslen, const SM2_KEY *server_ecdhe_key, SM2_POINT *client_ecdhe_public, uint8_t *server_exts, size_t *server_exts_len, size_t server_exts_maxlen) { size_t len = 0; *server_exts_len = 0; while (extslen) { uint16_t ext_type; const uint8_t *ext_data; size_t ext_datalen; if (tls_uint16_from_bytes(&ext_type, &exts, &extslen) != 1 || tls_uint16array_from_bytes(&ext_data, &ext_datalen, &exts, &extslen) != 1) { error_print(); return -1; } switch (ext_type) { /* // tls13_process_client_hello_exts 的接口需要处理，部分输出要输出到server_exts中 case TLS_extension_supported_groups: // 这个应该放在EE里面 if (tls_process_client_supported_groups(ext_data, ext_datalen, NULL, &len) != 1 || len > server_exts_maxlen) { error_print(); return -1; } tls_process_client_supported_groups(ext_data, ext_datalen, &server_exts, server_exts_len); break; case TLS_extension_signature_algorithms: // client单方面通知就可以了，服务器不需要响应 if (tls_process_client_signature_algorithms(ext_data, ext_datalen, NULL, &len) != 1 || len > server_exts_maxlen) { error_print(); return -1; } tls_process_client_signature_algorithms(ext_data, ext_datalen, &server_exts, server_exts_len); break; */ case TLS_extension_supported_versions: if (tls13_process_client_supported_versions(ext_data, ext_datalen, NULL, &len) != 1 || len > server_exts_maxlen) { error_print(); return -1; } tls13_process_client_supported_versions(ext_data, ext_datalen, &server_exts, server_exts_len); break; case TLS_extension_key_share: if (tls13_process_client_key_share(ext_data, ext_datalen, server_ecdhe_key, client_ecdhe_public, &server_exts, server_exts_len) != 1 || len > server_exts_maxlen) { error_print(); return -1; } break; default: ; // server ignore unkonwn extensions } } return 1; } int tls_client_key_shares_from_bytes(SM2_POINT *sm2_point, const uint8_t **in, size_t *inlen) { const uint8_t *key_shares; size_t key_shares_len; tls_uint16array_from_bytes(&key_shares, &key_shares_len, in, inlen); while (key_shares_len) { uint16_t group; const uint8_t *key_exch; size_t key_exch_len; tls_uint16_from_bytes(&group, &key_shares, &key_shares_len); tls_uint16array_from_bytes(&key_exch, &key_exch_len, &key_shares, &key_shares_len); if (key_exch_len != 65) { error_print(); return -1; } switch (group) { case TLS_curve_sm2p256v1: sm2_point_from_octets(sm2_point, key_exch, key_exch_len); break; default: error_print(); return -1; } } return 1; } // 这个函数不是太正确，应该也是一个process int tls13_server_hello_extensions_get(const uint8_t *exts, size_t extslen, SM2_POINT *sm2_point) { uint16_t version; while (extslen) { uint16_t ext_type; const uint8_t *ext_data; size_t ext_datalen; tls_uint16_from_bytes(&ext_type, &exts, &extslen); tls_uint16array_from_bytes(&ext_data, &ext_datalen, &exts, &extslen); switch (ext_type) { case TLS_extension_supported_versions: if (tls_uint16_from_bytes(&version, &ext_data, &ext_datalen) != 1 || ext_datalen > 0) { error_print(); return -1; } if (version != TLS_protocol_tls13) { error_print(); return -1; } break; case TLS_extension_key_share: if (tls13_process_server_key_share(ext_data, ext_datalen, sm2_point) != 1) { error_print(); return -1; } break; //default: // FIXME: 还有几个扩展没有处理！ //error_print(); //return -1; } } return 1; } /* struct { Extension extensions<0..2^16-1>; } EncryptedExtensions; */ static int tls13_encrypted_exts[] = { TLS_extension_server_name, TLS_extension_max_fragment_length, TLS_extension_supported_groups, TLS_extension_use_srtp, TLS_extension_heartbeat, TLS_extension_application_layer_protocol_negotiation, TLS_extension_client_certificate_type, TLS_extension_server_certificate_type, TLS_extension_early_data, }; int tls13_encrypted_extensions_print(FILE *fp, int fmt, int ind, const uint8_t *data, size_t datalen) { const uint8_t *exts; size_t extslen; format_print(fp, fmt, ind, "EncryptedExtensions\n"); ind += 4; if (tls_uint16array_from_bytes(&exts, &extslen, &data, &datalen) != 1) { error_print(); return -1; } if (exts) { tls13_extensions_print(fp, fmt, ind, TLS_handshake_encrypted_extensions, exts, extslen); } if (tls_length_is_zero(datalen) != 1) { error_print(); return -1; } return 1; } int tls13_record_set_handshake_encrypted_extensions(uint8_t *record, size_t *recordlen) { int type = TLS_handshake_encrypted_extensions; uint8_t *p = record + 5 + 4; size_t len = 0; uint8_t exts[128]; size_t extslen = 0; uint8_t *pexts = exts; const int supported_groups[] = { TLS_curve_sm2p256v1 }; tls_supported_groups_ext_to_bytes(supported_groups, sizeof(supported_groups)/sizeof(int), &pexts, &extslen); tls_uint16array_to_bytes(exts, extslen, &p, &len); tls_record_set_handshake(record, recordlen, type, NULL, len); return 1; } int tls13_record_get_handshake_encrypted_extensions(const uint8_t *record) { int type; const uint8_t *p; size_t len; const uint8_t *exts_data; size_t exts_datalen; if (tls_record_get_handshake(record, &type, &p, &len) != 1) { error_print(); return -1; } if (tls_uint16array_from_bytes(&exts_data, &exts_datalen, &p, &len) != 1) { error_print(); return -1; } // 当前实现不需要在EncryptedExtensions提供扩展 if (exts_datalen) { // FIXME: 实际上supported_groups是放在这里的，应该加以处理 //error_print(); //return -1; } return 1; } /* ClientHello.Extensions.signature_algorithms 列出客户端支持的签名+哈希算法 ServerHello.Extensions.supported_groups 决定了服务器的公钥类型， 因此也决定了服务器的签名算法 ServerHello.cipher_suite决定了哈希函数 */ /* struct { SignatureScheme algorithm; opaque signature<0..2^16-1>; } CertificateVerify; 注意：TLS 1.2中只有RAW signature, 也就是没有经过uint16array封装的，这其实不太符合TLS的设计逻辑 */ int tls13_record_set_handshake_certificate_verify(uint8_t *record, size_t *recordlen, int sign_algor, const uint8_t *sig, size_t siglen) { int type = TLS_handshake_certificate_verify; uint8_t *p = record + 5 + 4; size_t len = 0; tls_uint16_to_bytes((uint16_t)sign_algor, &p, &len); tls_uint16array_to_bytes(sig, siglen, &p, &len); if (tls_record_set_handshake(record, recordlen, type, NULL, len) != 1) { error_print(); return -1; } return 1; } int tls13_record_get_handshake_certificate_verify(const uint8_t *record, int *sign_algor, const uint8_t **sig, size_t *siglen) { int type; const uint8_t *p; size_t len ; uint16_t alg; if (tls_record_get_handshake(record, &type, &p, &len) != 1 || type != TLS_handshake_certificate_verify) { error_print(); return -1; } tls_uint16_from_bytes(&alg, &p, &len); tls_uint16array_from_bytes(sig, siglen, &p, &len); *sign_algor = alg; return 1; } /* struct { opaque certificate_request_context<0..2^8-1>; Extension extensions<2..2^16-1>; } CertificateRequest; certificate_request_context 用于 Post-handshake Authentication，否则应该长度为0 */ static int tls13_certificate_request_exts[] = { TLS_extension_signature_algorithms, // 必须包含 TLS_extension_status_request, TLS_extension_signed_certificate_timestamp, TLS_extension_certificate_authorities, TLS_extension_oid_filters, TLS_extension_signature_algorithms_cert, }; /* struct { opaque certificate_request_context<0..2^8-1>; Extension extensions<2..2^16-1>; } CertificateRequest; extensiosns: Extension signature_algorithms MUST be specified */ int tls13_record_set_handshake_certificate_request(uint8_t *record, size_t *recordlen, const uint8_t *request_context, size_t request_context_len, const uint8_t *exts, size_t extslen) { int type = TLS_handshake_certificate_request; uint8_t *data; size_t datalen = 0; if (!record || !recordlen) { error_print(); return -1; } data = tls_handshake_data(tls_record_data(record)); tls_uint8array_to_bytes(request_context, request_context_len, &data, &datalen); tls_uint16array_to_bytes(exts, extslen, &data, &datalen); tls_record_set_handshake(record, recordlen, type, NULL, datalen); return 1; } int tls13_record_set_handshake_certificate_request_default(uint8_t *record, size_t *recordlen) { int sig_algs[] = { TLS_sig_sm2sig_sm3 }; uint8_t exts[256]; uint8_t *p = exts; size_t extslen = 0; tls_signature_algorithms_ext_to_bytes(sig_algs, sizeof(sig_algs)/sizeof(int), &p, &extslen); tls13_record_set_handshake_certificate_request(record, recordlen, NULL, 0, exts, extslen); return 1; } int tls13_record_get_handshake_certificate_request(const uint8_t *record, const uint8_t **requst_context, size_t *request_context_len, const uint8_t **exts, size_t *exts_len) { int type; const uint8_t *p; size_t len; if (tls_record_get_handshake(record, &type, &p, &len) != 1) { error_print(); return -1; } if (type != TLS_handshake_certificate_request) { error_print(); return -1; } if (tls_uint8array_from_bytes(requst_context, request_context_len, &p, &len) != 1 || tls_uint16array_from_bytes(exts, exts_len, &p, &len) != 1 || tls_length_is_zero(len) != 1) { error_print(); return -1; } return 1; } static const int tls13_handshake_certificate_exts[] = { TLS_extension_status_request, TLS_extension_signed_certificate_timestamp, }; /* enum { X509(0), RawPublicKey(2), (255) } CertificateType; struct { select (certificate_type) { case RawPublicKey: opaque ASN1_subjectPublicKeyInfo<1..2^24-1>; -- TLS 1.3可以只传公钥不传证书 case X509: opaque cert_data<1..2^24-1>; }; Extension extensions<0..2^16-1>; } CertificateEntry; struct { opaque certificate_request_context<0..2^8-1>; -- 用于客户端证书，服务器证书该域长度为0 CertificateEntry certificate_list<0..2^24-1>; } Certificate; TLS 1.3 Certificate： * TLS 1.3 支持发送公钥，可以去掉嵌入式环境的证书传输开销 * TLS 1.3 的证书链中增加了 certificate_request_context 用于客户端发送证书时标识context，服务器端的证书中该域的长度为0 * 证书链中每个证书都有一个独立的扩展域，TLS 1.2 中的证书相关扩展移至此处 Extensions in client Certificate MUST from ClientHello Extensions in server Certificate MUST from CertificateRequest Entensions apply to entire chain SHOULD be in the first CertificateEntry 目前CertificateEntry中的扩展主要用于服务器证书的验证 客户端在ClientHello中可以包含status_request 和 signed_certificate_timestamp 让服务器提供 OCSP 的状态证明和时间戳信息 服务器则在证书消息的每个证书否面附带这两个扩展，提供相关信息 在 RFC 8446 (TLS 1.3) 中还没有涉及客户端证书的具体扩展 但是客户端在提供客户端证书时，应该响应服务器CertificateRequest消息中的扩展 目前GmSSLv3还不支持这两个证书扩展的生成，但是提供解析和显示 Valid extensions for server certificates: TLS_extension_status_request (5) TLS_extension_signed_certificate_timestamp (18) */ int tls13_certificate_print(FILE *fp, int fmt, int ind, const uint8_t *cert, size_t certlen) { const uint8_t *p; size_t len; format_print(fp, fmt, ind, "Certificate\n"); ind += 4; if (tls_uint8array_from_bytes(&p, &len, &cert, &certlen) != 1) { error_print(); return -1; } format_bytes(fp, fmt, ind, "certificate_request_context", p, len); format_print(fp, fmt, ind, "certificate_list\n"); ind += 4; if (tls_uint24array_from_bytes(&p, &len, &cert, &certlen) != 1) { error_print(); return -1; } while (len) { const uint8_t *cert_data; size_t cert_data_len; const uint8_t *exts; size_t extslen; if (tls_uint24array_from_bytes(&cert_data, &cert_data_len, &p, &len) != 1 || tls_uint16array_from_bytes(&exts, &extslen, &p, &len) != 1) { error_print(); return -1; } if (!cert_data) { error_print(); return -1; } format_print(fp, fmt, ind, "CertificateEntry\n"); x509_cert_print(fp, fmt, ind + 4, "Certificate", cert_data, cert_data_len); x509_cert_to_pem(cert_data, cert_data_len, fp); tls13_extensions_print(fp, fmt, ind + 4, TLS_handshake_certificate, exts, extslen); } return 1; } int tls13_certificate_request_print(FILE *fp, int fmt, int ind, const uint8_t *certreq, size_t certreqlen) { const uint8_t *p; size_t len; format_print(fp, fmt, ind, "CertificateRequest\n"); ind += 4; if (tls_uint8array_from_bytes(&p, &len, &certreq, &certreqlen) != 1) { error_print(); return -1; } format_bytes(fp, fmt, ind, "certificate_request_context", p, len); if (tls_uint16array_from_bytes(&p, &len, &certreq, &certreqlen) != 1) { error_print(); return -1; } format_bytes(fp, fmt, ind, "extensions", p, len); if (tls_length_is_zero(certreqlen) != 1) { error_print(); return -1; } return 1; } int tls13_certificate_verify_print(FILE *fp, int fmt, int ind, const uint8_t *d, size_t dlen) { uint16_t sig_alg; const uint8_t *sig; size_t siglen; format_print(fp, fmt, ind, "CertificateVerify\n"); ind += 4; if (tls_uint16_from_bytes(&sig_alg, &d, &dlen) != 1) { error_print(); return -1; } format_print(fp, fmt, ind, "algorithm: %s (0x%04x)\n", tls_signature_scheme_name(sig_alg), sig_alg); if (tls_uint16array_from_bytes(&sig, &siglen, &d, &dlen) != 1) { error_print(); return -1; } format_bytes(fp, fmt, ind, "signature", sig, siglen); if (tls_length_is_zero(dlen) != 1) { error_print(); return -1; } return 1; } int tls13_certificate_list_to_bytes(const uint8_t *certs, size_t certslen, uint8_t **out, size_t *outlen) { uint8_t *p = NULL; size_t cert_list_len = 0; if (out && *out) { p = (*out) + tls_uint24_size(); } while (certslen) { const uint8_t *cert; size_t certlen; const uint8_t *entry_exts = NULL; size_t entry_exts_len = 0; if (x509_cert_from_der(&cert, &certlen, &certs, &certslen) != 1) { error_print(); return -1; } tls_uint24array_to_bytes(cert, certlen, &p, &cert_list_len); tls_uint16array_to_bytes(entry_exts, entry_exts_len, &p, &cert_list_len); } tls_uint24array_to_bytes(NULL, cert_list_len, out, outlen); return 1; } int tls13_process_certificate_list(const uint8_t *cert_list, size_t cert_list_len, uint8_t *certs, size_t *certs_len) { *certs_len = 0; while (cert_list_len) { const uint8_t *cert_data; size_t cert_data_len; const uint8_t *exts; size_t exts_len; const uint8_t *cert; size_t cert_len; if (tls_uint24array_from_bytes(&cert_data, &cert_data_len, &cert_list, &cert_list_len) != 1 || tls_uint16array_from_bytes(&exts, &exts_len, &cert_list, &cert_list_len) != 1) { error_print(); return -1; } if (x509_cert_from_der(&cert, &cert_len, &cert_data, &cert_data_len) != 1 || asn1_length_is_zero(cert_data_len) != 1 || x509_cert_to_der(cert, cert_len, &certs, certs_len) != 1) { error_print(); return -1; } while (exts_len) { int ext_type; const uint8_t *ext_data; size_t ext_data_len; if (tls_ext_from_bytes(&ext_type, &ext_data, &ext_data_len, &exts, &exts_len) != 1) { error_print(); return -1; } switch (ext_type) { case TLS_extension_status_request: case TLS_extension_signed_certificate_timestamp: error_print(); return -1; default: error_print(); return -1; } } } return 1; } int tls13_record_set_handshake_certificate(uint8_t *record, size_t *recordlen, const uint8_t *request_context, size_t request_context_len, const uint8_t *certs, size_t certslen) { int type = TLS_handshake_certificate; uint8_t *data; size_t datalen; if (!record || !recordlen || !certs || !certslen) { error_print(); return -1; } datalen = 0; tls_uint8array_to_bytes(request_context, request_context_len, NULL, &datalen); tls13_certificate_list_to_bytes(certs, certslen, NULL, &datalen); if (datalen > TLS_MAX_HANDSHAKE_DATA_SIZE) { error_print(); return -1; } data = tls_handshake_data(tls_record_data(record)); datalen = 0; tls_uint8array_to_bytes(request_context, request_context_len, &data, &datalen); tls13_certificate_list_to_bytes(certs, certslen, &data, &datalen); tls_record_set_handshake(record, recordlen, type, NULL, datalen); return 1; } int tls13_record_get_handshake_certificate(const uint8_t *record, const uint8_t **cert_request_context, size_t *cert_request_context_len, const uint8_t **cert_list, size_t *cert_list_len) { int type; const uint8_t *p; size_t len; if (tls_record_get_handshake(record, &type, &p, &len) != 1) { error_print(); return -1; } if (type != TLS_handshake_certificate) { error_print(); return -1; } if (tls_uint8array_from_bytes(cert_request_context, cert_request_context_len, &p, &len) != 1 || tls_uint24array_from_bytes(cert_list, cert_list_len, &p, &len) != 1 || tls_length_is_zero(len) != 1) { error_print(); return -1; } if (*cert_list == NULL) { error_print(); return -1; } return 1; } /* finished_key = HKDF-Expand-Label(BaseKey, "finished", "", Hash.length) struct { opaque verify_data[Hash.length]; } Finished; verify_data = HMAC(finished_key, Hash(Handshake Context, Certificate*, CertificateVerify*)) Hash = SM3, SHA256 or SHA384 */ int tls13_record_set_handshake_finished(uint8_t *record, size_t *recordlen, const uint8_t *verify_data, size_t verify_data_len) { int type = TLS_handshake_finished; if (!record || !recordlen || !verify_data) { error_print(); return -1; } tls_record_set_handshake(record, recordlen, type, verify_data, verify_data_len); return 1; } int tls13_record_get_handshake_finished(const uint8_t *record, const uint8_t **verify_data, size_t *verify_data_len) { int type; if (tls_record_get_handshake(record, &type, verify_data, verify_data_len) != 1) { error_print(); return -1; } if (type != TLS_handshake_finished) { error_print(); return -1; } if (*verify_data_len != SM3_DIGEST_SIZE && *verify_data_len != SHA384_DIGEST_SIZE) { error_print(); return -1; } return 1; } int tls13_padding_len_rand(size_t *padding_len) { uint8_t val; rand_bytes(&val, 1); *padding_len = val % 128; return 1; } int tls13_cipher_suite_get(int cipher_suite, const DIGEST **digest, const BLOCK_CIPHER **cipher) { switch (cipher_suite) { case TLS_cipher_sm4_gcm_sm3: *digest = DIGEST_sm3(); *cipher = BLOCK_CIPHER_sm4(); break; case TLS_cipher_aes_128_gcm_sha256: *digest = DIGEST_sha256(); *cipher = BLOCK_CIPHER_aes128(); break; default: error_print(); return -1; } return 1; } /* Client Server Key ^ ClientHello Exch | + key_share* | + signature_algorithms* | + psk_key_exchange_modes* v + pre_shared_key* --------> ServerHello ^ Key + key_share* | Exch + pre_shared_key* v | ecdhe => handshake_secret | | handshake_secret => master_secret | | handshake_secret, client_hello, server_hello | | => client_handshake_traffic_secret | | => server_handshake_traffic_secret | {EncryptedExtensions} ^ Server {CertificateRequest*} v Params {Certificate} ^ {CertificateVerify} | Auth {Finished} v + master_secret, ClientHello .. server Finished => server_application_traffic_secret_0 <-------- [Application Data*] ^ {Certificate*} Auth | {CertificateVerify*} v {Finished} --------> + master_secret, ClientHello .. server Finished => client_application_traffic_secret_0 [Application Data] <-------> [Application Data] TLS 1.3的区别： * 首先在最开始的握手阶段就协商好了密钥，因此握手之后传输的就是加密消息了 * 因此在第二阶段，双方不再发送ServerKeyExchange和ClientKeyExchange * 服务器先发送CertificateRequest，再发送Certificate * 没有ChangeCipherSpec了 * 在握手阶段就需要加密，并且Certificate也在其中，因此需要格外的大的密文数据缓冲 0 | v [1] PSK -> HKDF-Extract = Early Secret | [2] +-----> Derive-Secret(., "ext binder" | "res binder", "") | = binder_key | [3] +-----> Derive-Secret(., "c e traffic", ClientHello) | = client_early_traffic_secret | [4] +-----> Derive-Secret(., "e exp master", ClientHello) | = early_exporter_master_secret v [5] Derive-Secret(., "derived", "") | v [6] (EC)DHE -> HKDF-Extract = Handshake Secret | [7] +-----> Derive-Secret(., "c hs traffic", | ClientHello...ServerHello) | = client_handshake_traffic_secret | [8] +-----> Derive-Secret(., "s hs traffic", | ClientHello...ServerHello) | = server_handshake_traffic_secret v [9] Derive-Secret(., "derived", "") | v [10] 0 -> HKDF-Extract = Master Secret | [11] +-----> Derive-Secret(., "c ap traffic", | ClientHello...server Finished) | = client_application_traffic_secret_0 | [12] +-----> Derive-Secret(., "s ap traffic", | ClientHello...server Finished) | = server_application_traffic_secret_0 | [13] +-----> Derive-Secret(., "exp master", | ClientHello...server Finished) | = exporter_master_secret | [14] +-----> Derive-Secret(., "res master", ClientHello...client Finished) = resumption_master_secret */ int tls13_do_connect(TLS_CONNECT *conn) { int ret = -1; uint8_t *record = conn->record; uint8_t *enced_record = conn->enced_record; size_t recordlen; size_t enced_recordlen; int type; const uint8_t *data; size_t datalen; int protocol; uint8_t client_random[32]; uint8_t server_random[32]; int cipher_suite; const uint8_t *random; const uint8_t *session_id; size_t session_id_len; int protocols[] = { TLS_protocol_tls13 }; int supported_groups[] = { TLS_curve_sm2p256v1 }; int sign_algors[] = { TLS_sig_sm2sig_sm3 }; uint8_t client_exts[TLS_MAX_EXTENSIONS_SIZE]; size_t client_exts_len; const uint8_t *server_exts; size_t server_exts_len; uint8_t sig[TLS_MAX_SIGNATURE_SIZE]; size_t siglen = sizeof(sig); uint8_t verify_data[32]; size_t verify_data_len; int server_sign_algor; const uint8_t *server_sig; size_t server_siglen; const uint8_t *server_verify_data; size_t server_verify_data_len; SM2_KEY client_ecdhe; SM2_POINT server_ecdhe_public; SM2_KEY server_sign_key; const DIGEST *digest = DIGEST_sm3(); DIGEST_CTX dgst_ctx; // secret generation过程中需要ClientHello等数据输入的 DIGEST_CTX null_dgst_ctx; // secret generation过程中不需要握手数据的 const BLOCK_CIPHER *cipher = NULL; size_t padding_len; uint8_t zeros[32] = {0}; uint8_t psk[32] = {0}; uint8_t early_secret[32]; uint8_t handshake_secret[32]; uint8_t master_secret[32]; uint8_t client_handshake_traffic_secret[32]; uint8_t server_handshake_traffic_secret[32]; uint8_t client_application_traffic_secret[32]; uint8_t server_application_traffic_secret[32]; uint8_t client_write_key[16]; uint8_t server_write_key[16]; const uint8_t *request_context; size_t request_context_len; const uint8_t *cert_request_exts; size_t cert_request_extslen; const uint8_t *cert_list; size_t cert_list_len; const uint8_t *cert; size_t certlen; conn->is_client = 1; tls_record_set_protocol(enced_record, TLS_protocol_tls12); digest_init(&dgst_ctx, digest); null_dgst_ctx = dgst_ctx; // send ClientHello tls_trace("send ClientHello\n"); tls_record_set_protocol(record, TLS_protocol_tls1); rand_bytes(client_random, 32); // TLS 1.3 Random 不再包含 UNIX Time sm2_key_generate(&client_ecdhe); tls13_client_hello_exts_set(client_exts, &client_exts_len, sizeof(client_exts), &(client_ecdhe.public_key)); tls_record_set_handshake_client_hello(record, &recordlen, TLS_protocol_tls12, client_random, NULL, 0, tls13_ciphers, sizeof(tls13_ciphers)/sizeof(tls13_ciphers[0]), client_exts, client_exts_len); tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls_record_send(record, recordlen, conn->sock) != 1) { error_print(); goto end; } // 此时尚未确定digest算法，因此无法digest_update // recv ServerHello tls_trace("recv ServerHello\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } tls13_record_trace(stderr, enced_record, enced_recordlen, 0, 0); if (tls_record_get_handshake_server_hello(enced_record, &protocol, &random, &session_id, &session_id_len, &cipher_suite, &server_exts, &server_exts_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (protocol != TLS_protocol_tls12) { error_print(); tls_send_alert(conn, TLS_alert_protocol_version); goto end; } memcpy(server_random, random, 32); memcpy(conn->session_id, session_id, session_id_len); conn->session_id_len = session_id_len; if (tls_cipher_suite_in_list(cipher_suite, tls13_ciphers, sizeof(tls13_ciphers)/sizeof(tls13_ciphers[0])) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } conn->cipher_suite = cipher_suite; if (tls13_server_hello_extensions_get(server_exts, server_exts_len, &server_ecdhe_public) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } conn->protocol = TLS_protocol_tls13; tls13_cipher_suite_get(conn->cipher_suite, &digest, &cipher); digest_update(&dgst_ctx, record + 5, recordlen - 5); digest_update(&dgst_ctx, enced_record + 5, enced_recordlen - 5); printf("generate handshake secrets\n"); /* generate handshake keys uint8_t client_write_key[32] uint8_t server_write_key[32] uint8_t client_write_iv[12] uint8_t server_write_iv[12] */ sm2_do_ecdh(&client_ecdhe, &server_ecdhe_public, &server_ecdhe_public); /* [1] */ tls13_hkdf_extract(digest, zeros, psk, early_secret); /* [5] */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret); /* [6] */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&server_ecdhe_public, handshake_secret); /* [7] */ tls13_derive_secret(handshake_secret, "c hs traffic", &dgst_ctx, client_handshake_traffic_secret); /* [8] */ tls13_derive_secret(handshake_secret, "s hs traffic", &dgst_ctx, server_handshake_traffic_secret); /* [9] */ tls13_derive_secret(handshake_secret, "derived", &null_dgst_ctx, master_secret); /* [10] */ tls13_hkdf_extract(digest, master_secret, zeros, master_secret); //[sender]_write_key = HKDF-Expand-Label(Secret, "key", "", key_length) //[sender]_write_iv = HKDF-Expand-Label(Secret, "iv", "", iv_length) //[sender] in {server, client} tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "key", NULL, 0, 16, server_write_key); tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv); block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key); memset(conn->server_seq_num, 0, 8); tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "key", NULL, 0, 16, client_write_key); tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv); block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key); memset(conn->client_seq_num, 0, 8); /* format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16); format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16); format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12); format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ // recv {EncryptedExtensions} printf("recv {EncryptedExtensions}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_encrypted_extensions(record) != 1) { tls_send_alert(conn, TLS_alert_handshake_failure); error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // recv {CertififcateRequest*} or {Certificate} if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } if (tls_record_get_handshake(record, &type, &data, &datalen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } if (type == TLS_handshake_certificate_request) { tls_trace("recv {CertificateRequest*}\n"); tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_certificate_request(record, &request_context, &request_context_len, &cert_request_exts, &cert_request_extslen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } // 当前忽略 request_context 和 cert_request_exts // request_context 应该为空，当前实现中不支持Post-Handshake Auth digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // recv {Certificate} if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_handshake_failure); goto end; } if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } } else { conn->client_certs_len = 0; // 清空客户端签名密钥 } // recv {Certificate} tls_trace("recv {Certificate}\n"); tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_certificate(record, &request_context, &request_context_len, &cert_list, &cert_list_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_process_certificate_list(cert_list, cert_list_len, conn->server_certs, &conn->server_certs_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (x509_certs_get_cert_by_index(conn->server_certs, conn->server_certs_len, 0, &cert, &certlen) != 1 || x509_cert_get_subject_public_key(cert, certlen, &server_sign_key) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // verify ServerCertificate int verify_result = 0; // TODO: maybe remove this arg from x509_certs_verify() if (x509_certs_verify(conn->server_certs, conn->server_certs_len, X509_cert_chain_server, conn->ca_certs, conn->ca_certs_len, X509_MAX_VERIFY_DEPTH, &verify_result) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_certificate); goto end; } // recv {CertificateVerify} tls_trace("recv {CertificateVerify}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_certificate_verify(record, &server_sign_algor, &server_sig, &server_siglen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (server_sign_algor != TLS_sig_sm2sig_sm3) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_verify_certificate_verify(TLS_server_mode, &server_sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, server_sig, server_siglen) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // use Transcript-Hash(Handshake Context, Certificate*, CertificateVerify*) tls13_compute_verify_data(server_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len); // recv {Finished} tls_trace("recv {Finished}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_finished(record, &server_verify_data, &server_verify_data_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (server_verify_data_len != verify_data_len || memcmp(server_verify_data, verify_data, verify_data_len) != 0) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // generate server_application_traffic_secret /* [12] */ tls13_derive_secret(master_secret, "s ap traffic", &dgst_ctx, server_application_traffic_secret); // generate client_application_traffic_secret /* [11] */ tls13_derive_secret(master_secret, "c ap traffic", &dgst_ctx, client_application_traffic_secret); if (conn->client_certs_len) { int client_sign_algor; uint8_t sig[TLS_MAX_SIGNATURE_SIZE]; size_t siglen; // send client {Certificate*} tls_trace("send {Certificate*}\n"); if (tls13_record_set_handshake_certificate(record, &recordlen, NULL, 0, // certificate_request_context conn->client_certs, conn->client_certs_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); // send {CertificateVerify*} tls_trace("send {CertificateVerify*}\n"); client_sign_algor = TLS_sig_sm2sig_sm3; // FIXME: 应该放在conn里面 tls13_sign_certificate_verify(TLS_client_mode, &conn->sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, sig, &siglen); if (tls13_record_set_handshake_certificate_verify(record, &recordlen, client_sign_algor, sig, siglen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); } // send Client {Finished} tls_trace("send {Finished}\n"); tls13_compute_verify_data(client_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len); if (tls_record_set_handshake_finished(record, &recordlen, verify_data, verify_data_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); // update server_write_key, server_write_iv, reset server_seq_num tls13_hkdf_expand_label(digest, server_application_traffic_secret, "key", NULL, 0, 16, server_write_key); block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key); tls13_hkdf_expand_label(digest, server_application_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv); memset(conn->server_seq_num, 0, 8); /* format_print(stderr, 0, 0, "update server secrets\n"); format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16); format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ //update client_write_key, client_write_iv, reset client_seq_num tls13_hkdf_expand_label(digest, client_application_traffic_secret, "key", NULL, 0, 16, client_write_key); tls13_hkdf_expand_label(digest, client_application_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv); block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key); memset(conn->client_seq_num, 0, 8); /* format_print(stderr, 0, 0, "update client secrets\n"); format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16); format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ fprintf(stderr, "Connection established\n"); ret = 1; end: gmssl_secure_clear(&client_ecdhe, sizeof(client_ecdhe)); gmssl_secure_clear(&server_sign_key, sizeof(server_sign_key)); gmssl_secure_clear(psk, sizeof(psk)); gmssl_secure_clear(early_secret, sizeof(early_secret)); gmssl_secure_clear(handshake_secret, sizeof(handshake_secret)); gmssl_secure_clear(master_secret, sizeof(master_secret)); gmssl_secure_clear(client_handshake_traffic_secret, sizeof(client_handshake_traffic_secret)); gmssl_secure_clear(server_handshake_traffic_secret, sizeof(server_handshake_traffic_secret)); gmssl_secure_clear(client_application_traffic_secret, sizeof(client_application_traffic_secret)); gmssl_secure_clear(server_application_traffic_secret, sizeof(server_application_traffic_secret)); gmssl_secure_clear(client_write_key, sizeof(client_write_key)); gmssl_secure_clear(server_write_key, sizeof(server_write_key)); return ret; } int tls13_do_accept(TLS_CONNECT *conn) { int ret = -1; uint8_t *record = conn->record; size_t recordlen; uint8_t enced_record[25600]; size_t enced_recordlen = sizeof(enced_record); int server_ciphers[] = { TLS_cipher_sm4_gcm_sm3 }; int protocol; const uint8_t *random; const uint8_t *session_id; size_t session_id_len; const uint8_t *client_exts; size_t client_exts_len; uint8_t client_random[32]; uint8_t server_random[32]; const uint8_t *client_ciphers; size_t client_ciphers_len; uint8_t server_exts[TLS_MAX_EXTENSIONS_SIZE]; size_t server_exts_len; SM2_KEY server_ecdhe; SM2_POINT client_ecdhe_public; SM2_KEY client_sign_key; const BLOCK_CIPHER *cipher; const DIGEST *digest; DIGEST_CTX dgst_ctx; DIGEST_CTX null_dgst_ctx; size_t padding_len; uint8_t sig[TLS_MAX_SIGNATURE_SIZE]; size_t siglen = sizeof(sig); uint8_t verify_data[32]; size_t verify_data_len; const uint8_t *client_verify_data; size_t client_verify_data_len; uint8_t client_write_key[16]; uint8_t server_write_key[16]; uint8_t zeros[32] = {0}; uint8_t psk[32] = {0}; uint8_t early_secret[32]; uint8_t handshake_secret[32]; uint8_t client_handshake_traffic_secret[32]; uint8_t server_handshake_traffic_secret[32]; uint8_t client_application_traffic_secret[32]; uint8_t server_application_traffic_secret[32]; uint8_t master_secret[32]; const uint8_t *request_context; size_t request_context_len; const uint8_t *cert_list; size_t cert_list_len; const uint8_t *cert; size_t certlen; int client_verify = 0; if (conn->ca_certs_len) client_verify = 1; // 1. Recv ClientHello tls_trace("recv ClientHello\n"); if (tls_record_recv(record, &recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls_record_get_handshake_client_hello(record, &protocol, &random, &session_id, &session_id_len, // 不支持SessionID，不做任何处理 &client_ciphers, &client_ciphers_len, &client_exts, &client_exts_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (protocol != TLS_protocol_tls12) { error_print(); tls_send_alert(conn, TLS_alert_protocol_version); goto end; } memcpy(client_random, random, 32); if (tls_cipher_suites_select(client_ciphers, client_ciphers_len, server_ciphers, sizeof(server_ciphers)/sizeof(int), &conn->cipher_suite) != 1) { error_print(); tls_send_alert(conn, TLS_alert_insufficient_security); goto end; } if (!client_exts) { error_print(); goto end; } tls13_cipher_suite_get(conn->cipher_suite, &digest, &cipher); // 这个函数是否应该放到tls_里面？ digest_init(&dgst_ctx, digest); null_dgst_ctx = dgst_ctx; // 在密钥导出函数中可能输入的消息为空，因此需要一个空的dgst_ctx，这里不对了，应该在tls13_derive_secret里面直接支持NULL！ digest_update(&dgst_ctx, record + 5, recordlen - 5); // 2. Send ServerHello tls_trace("send ServerHello\n"); rand_bytes(server_random, 32); sm2_key_generate(&server_ecdhe); if (tls13_process_client_hello_exts(client_exts, client_exts_len, &server_ecdhe, &client_ecdhe_public, server_exts, &server_exts_len, sizeof(server_exts)) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } tls_record_set_protocol(record, TLS_protocol_tls12); if (tls_record_set_handshake_server_hello(record, &recordlen, TLS_protocol_tls12, server_random, NULL, 0, // openssl的兼容模式在ClientHello中发送SessionID并检查在ServerHello是否返回，用`-no_middlebox`可关闭兼容模式 conn->cipher_suite, server_exts, server_exts_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls_record_send(record, recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); sm2_do_ecdh(&server_ecdhe, &client_ecdhe_public, &client_ecdhe_public); /* 1 */ tls13_hkdf_extract(digest, zeros, psk, early_secret); /* 5 */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret); /* 6 */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&client_ecdhe_public, handshake_secret); /* 7 */ tls13_derive_secret(handshake_secret, "c hs traffic", &dgst_ctx, client_handshake_traffic_secret); /* 8 */ tls13_derive_secret(handshake_secret, "s hs traffic", &dgst_ctx, server_handshake_traffic_secret); /* 9 */ tls13_derive_secret(handshake_secret, "derived", &null_dgst_ctx, master_secret); /* 10 */ tls13_hkdf_extract(digest, master_secret, zeros, master_secret); // generate server_write_key, server_write_iv, reset server_seq_num tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "key", NULL, 0, 16, server_write_key); block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key); tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv); memset(conn->server_seq_num, 0, 8); // generate client_write_key, client_write_iv, reset client_seq_num tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "key", NULL, 0, 16, client_write_key); block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key); tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv); memset(conn->client_seq_num, 0, 8); /* format_print(stderr, 0, 0, "generate handshake secrets\n"); format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16); format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12); format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16); format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ // 3. Send {EncryptedExtensions} tls_trace("send {EncryptedExtensions}\n"); tls_record_set_protocol(record, TLS_protocol_tls12); tls13_record_set_handshake_encrypted_extensions(record, &recordlen); tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } // FIXME: tls13_record_encrypt需要支持握手消息 // tls_record_data(enced_record)[0] = TLS_handshake_encrypted_extensions; if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // send {CertificateRequest*} if (client_verify) { tls_trace("send {CertificateRequest*}\n"); // TODO: 设置certificate_request中的extensions! if (tls13_record_set_handshake_certificate_request_default(record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); } // send Server {Certificate} tls_trace("send {Certificate}\n"); if (tls13_record_set_handshake_certificate(record, &recordlen, NULL, 0, conn->server_certs, conn->server_certs_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // send Server {CertificateVerify} tls_trace("send {CertificateVerify}\n"); tls13_sign_certificate_verify(TLS_server_mode, &conn->sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, sig, &siglen); if (tls13_record_set_handshake_certificate_verify(record, &recordlen, TLS_sig_sm2sig_sm3, sig, siglen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // Send Server {Finished} tls_trace("send {Finished}\n"); // compute server verify_data before digest_update() tls13_compute_verify_data(server_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len); if (tls13_record_set_handshake_finished(record, &recordlen, verify_data, verify_data_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); tls13_padding_len_rand(&padding_len); if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv, conn->server_seq_num, record, recordlen, padding_len, enced_record, &enced_recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) { error_print(); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->server_seq_num); // generate server_application_traffic_secret /* 12 */ tls13_derive_secret(master_secret, "s ap traffic", &dgst_ctx, server_application_traffic_secret); // Generate client_application_traffic_secret /* 11 */ tls13_derive_secret(master_secret, "c ap traffic", &dgst_ctx, client_application_traffic_secret); // 因为后面还要解密握手消息，因此client application key, iv 等到握手结束之后再更新 // Recv Client {Certificate*} if (client_verify) { tls_trace("recv {Certificate*}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_certificate(record, &request_context, &request_context_len, &cert_list, &cert_list_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_process_certificate_list(cert_list, cert_list_len, conn->client_certs, &conn->client_certs_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (x509_certs_get_cert_by_index(conn->client_certs, conn->client_certs_len, 0, &cert, &certlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (x509_cert_get_subject_public_key(cert, certlen, &client_sign_key) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); // verify client Certificate int verify_result; if (x509_certs_verify(conn->client_certs, conn->client_certs_len, X509_cert_chain_client, conn->ca_certs, conn->ca_certs_len, X509_MAX_VERIFY_DEPTH, &verify_result) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_certificate); goto end; } } // Recv client {CertificateVerify*} if (client_verify) { int client_sign_algor; const uint8_t *client_sig; size_t client_siglen; tls_trace("recv Client {CertificateVerify*}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_certificate_verify(record, &client_sign_algor, &client_sig, &client_siglen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_verify_certificate_verify(TLS_client_mode, &client_sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, client_sig, client_siglen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_decrypt_error); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); } // 12. Recv Client {Finished} tls_trace("recv {Finished}\n"); if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv, conn->client_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } tls13_record_trace(stderr, record, recordlen, 0, 0); if (tls13_record_get_handshake_finished(record, &client_verify_data, &client_verify_data_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_unexpected_message); goto end; } if (tls13_compute_verify_data(client_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len) != 1) { error_print(); tls_send_alert(conn, TLS_alert_internal_error); goto end; } if (client_verify_data_len != verify_data_len || memcmp(client_verify_data, verify_data, verify_data_len) != 0) { error_print(); tls_send_alert(conn, TLS_alert_bad_record_mac); goto end; } digest_update(&dgst_ctx, record + 5, recordlen - 5); tls_seq_num_incr(conn->client_seq_num); // 注意：OpenSSL兼容模式在此处会收发ChangeCipherSpec报文 // update server_write_key, server_write_iv, reset server_seq_num tls13_hkdf_expand_label(digest, server_application_traffic_secret, "key", NULL, 0, 16, server_write_key); tls13_hkdf_expand_label(digest, server_application_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv); block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key); memset(conn->server_seq_num, 0, 8); /* format_print(stderr, 0, 0, "update server secrets\n"); format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16); format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ // update client_write_key, client_write_iv // reset client_seq_num tls13_hkdf_expand_label(digest, client_application_traffic_secret, "key", NULL, 0, 16, client_write_key); tls13_hkdf_expand_label(digest, client_application_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv); block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key); memset(conn->client_seq_num, 0, 8); /* format_print(stderr, 0, 0, "update client secrets\n"); format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16); format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12); format_print(stderr, 0, 0, "\n"); */ fprintf(stderr, "Connection Established!\n\n"); ret = 1; end: gmssl_secure_clear(&server_ecdhe, sizeof(server_ecdhe)); gmssl_secure_clear(&client_sign_key, sizeof(client_sign_key)); gmssl_secure_clear(psk, sizeof(psk)); gmssl_secure_clear(early_secret, sizeof(early_secret)); gmssl_secure_clear(handshake_secret, sizeof(handshake_secret)); gmssl_secure_clear(master_secret, sizeof(master_secret)); gmssl_secure_clear(client_handshake_traffic_secret, sizeof(client_handshake_traffic_secret)); gmssl_secure_clear(server_handshake_traffic_secret, sizeof(server_handshake_traffic_secret)); gmssl_secure_clear(client_application_traffic_secret, sizeof(client_application_traffic_secret)); gmssl_secure_clear(server_application_traffic_secret, sizeof(server_application_traffic_secret)); gmssl_secure_clear(client_write_key, sizeof(client_write_key)); gmssl_secure_clear(server_write_key, sizeof(server_write_key)); return ret; }