/* Copyright 2015-2016 Amebis Copyright 2016 GÉANT This file is part of GÉANTLink. GÉANTLink is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GÉANTLink is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GÉANTLink. If not, see . */ #include "StdAfx.h" using namespace std; using namespace winstd; ////////////////////////////////////////////////////////////////////// // eap::method_tls::packet ////////////////////////////////////////////////////////////////////// eap::method_tls::packet::packet() : m_code((EapCode)0), m_id(0), m_flags(0) { } eap::method_tls::packet::packet(_In_ const packet &other) : m_code (other.m_code ), m_id (other.m_id ), m_flags(other.m_flags), m_data (other.m_data ) { } eap::method_tls::packet::packet(_Inout_ packet &&other) : m_code (std::move(other.m_code )), m_id (std::move(other.m_id )), m_flags(std::move(other.m_flags)), m_data (std::move(other.m_data )) { } eap::method_tls::packet& eap::method_tls::packet::operator=(_In_ const packet &other) { if (this != std::addressof(other)) { m_code = other.m_code ; m_id = other.m_id ; m_flags = other.m_flags; m_data = other.m_data ; } return *this; } eap::method_tls::packet& eap::method_tls::packet::operator=(_Inout_ packet &&other) { if (this != std::addressof(other)) { m_code = std::move(other.m_code ); m_id = std::move(other.m_id ); m_flags = std::move(other.m_flags); m_data = std::move(other.m_data ); } return *this; } void eap::method_tls::packet::clear() { m_code = (EapCode)0; m_id = 0; m_flags = 0; m_data.clear(); } ////////////////////////////////////////////////////////////////////// // eap::method_tls ////////////////////////////////////////////////////////////////////// eap::method_tls::method_tls(_In_ module &module, _In_ config_provider_list &cfg, _In_ credentials_tls &cred) : m_cred(cred), m_certificate_req(false), m_server_hello_done(false), m_server_finished(false), m_seq_num_client(0), m_seq_num_server(0), m_blob_cfg(NULL), #ifdef EAP_USE_NATIVE_CREDENTIAL_CACHE m_blob_cred(NULL), #endif method(module, cfg, cred) { m_tls_version = tls_version_1_2; } eap::method_tls::method_tls(_Inout_ method_tls &&other) : m_cred ( other.m_cred ), m_packet_req (std::move(other.m_packet_req )), m_packet_res (std::move(other.m_packet_res )), m_cp (std::move(other.m_cp )), m_cp_enc (std::move(other.m_cp_enc )), m_key_exp1 (std::move(other.m_key_exp1 )), m_tls_version (std::move(other.m_tls_version )), m_alg_prf (std::move(other.m_alg_prf )), m_state_client (std::move(other.m_state_client )), m_state_client_pending (std::move(other.m_state_client_pending )), m_state_server (std::move(other.m_state_server )), m_state_server_pending (std::move(other.m_state_server_pending )), m_master_secret (std::move(other.m_master_secret )), m_random_client (std::move(other.m_random_client )), m_random_server (std::move(other.m_random_server )), m_key_mppe_client (std::move(other.m_key_mppe_client )), m_key_mppe_server (std::move(other.m_key_mppe_server )), m_session_id (std::move(other.m_session_id )), m_server_cert_chain (std::move(other.m_server_cert_chain )), m_hash_handshake_msgs_md5 (std::move(other.m_hash_handshake_msgs_md5 )), m_hash_handshake_msgs_sha1 (std::move(other.m_hash_handshake_msgs_sha1 )), m_hash_handshake_msgs_sha256(std::move(other.m_hash_handshake_msgs_sha256)), m_certificate_req (std::move(other.m_certificate_req )), m_server_hello_done (std::move(other.m_server_hello_done )), m_server_finished (std::move(other.m_server_finished )), m_seq_num_client (std::move(other.m_seq_num_client )), m_seq_num_server (std::move(other.m_seq_num_server )), method (std::move(other )) { } eap::method_tls::~method_tls() { if (m_blob_cfg) m_module.free_memory(m_blob_cfg); #ifdef EAP_USE_NATIVE_CREDENTIAL_CACHE if (m_blob_cred) m_module.free_memory(m_blob_cred); #endif } eap::method_tls& eap::method_tls::operator=(_Inout_ method_tls &&other) { if (this != std::addressof(other)) { assert(std::addressof(m_cred) == std::addressof(other.m_cred)); // Move method with same credentials only! (method&)*this = std::move(other ); m_packet_req = std::move(other.m_packet_req ); m_packet_res = std::move(other.m_packet_res ); m_cp = std::move(other.m_cp ); m_cp_enc = std::move(other.m_cp_enc ); m_key_exp1 = std::move(other.m_key_exp1 ); m_tls_version = std::move(other.m_tls_version ); m_alg_prf = std::move(other.m_alg_prf ); m_state_client = std::move(other.m_state_client ); m_state_client_pending = std::move(other.m_state_client_pending ); m_state_server = std::move(other.m_state_server ); m_state_server_pending = std::move(other.m_state_server_pending ); m_master_secret = std::move(other.m_master_secret ); m_random_client = std::move(other.m_random_client ); m_random_server = std::move(other.m_random_server ); m_key_mppe_client = std::move(other.m_key_mppe_client ); m_key_mppe_server = std::move(other.m_key_mppe_server ); m_session_id = std::move(other.m_session_id ); m_server_cert_chain = std::move(other.m_server_cert_chain ); m_hash_handshake_msgs_md5 = std::move(other.m_hash_handshake_msgs_md5 ); m_hash_handshake_msgs_sha1 = std::move(other.m_hash_handshake_msgs_sha1 ); m_hash_handshake_msgs_sha256 = std::move(other.m_hash_handshake_msgs_sha256); m_certificate_req = std::move(other.m_certificate_req ); m_server_hello_done = std::move(other.m_server_hello_done ); m_server_finished = std::move(other.m_server_finished ); m_seq_num_client = std::move(other.m_seq_num_client ); m_seq_num_server = std::move(other.m_seq_num_server ); } return *this; } void eap::method_tls::begin_session( _In_ DWORD dwFlags, _In_ const EapAttributes *pAttributeArray, _In_ HANDLE hTokenImpersonateUser, _In_ DWORD dwMaxSendPacketSize) { method::begin_session(dwFlags, pAttributeArray, hTokenImpersonateUser, dwMaxSendPacketSize); // Create cryptographics provider. if (!m_cp.create(NULL, NULL, PROV_RSA_AES)) throw win_runtime_error(__FUNCTION__ " Error creating cryptographics provider."); // Microsoft CryptoAPI does not support importing clear text session keys. // Therefore, we trick it to say the session key is "encrypted" with an exponent-of-one key. if (!m_key_exp1.create_exp1(m_cp, AT_KEYEXCHANGE)) throw win_runtime_error(__FUNCTION__ " Error creating exponent-of-one key."); if (m_cfg.m_providers.empty() || m_cfg.m_providers.front().m_methods.empty()) throw invalid_argument(__FUNCTION__ " Configuration has no providers and/or methods."); const config_provider &cfg_prov(m_cfg.m_providers.front()); const config_method_tls *cfg_method = dynamic_cast(cfg_prov.m_methods.front().get()); assert(cfg_method); m_session_id = cfg_method->m_session_id; m_master_secret = cfg_method->m_master_secret; } void eap::method_tls::process_request_packet( _In_bytecount_(dwReceivedPacketSize) const EapPacket *pReceivedPacket, _In_ DWORD dwReceivedPacketSize, _Inout_ EapPeerMethodOutput *pEapOutput) { assert(pReceivedPacket && dwReceivedPacketSize >= 4); assert(pEapOutput); // Is this a valid EAP-TLS packet? if (dwReceivedPacketSize < 6) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Packet is too small. EAP-%s packets should be at least 6B."); //else if (pReceivedPacket->Data[0] != eap_type_tls) // Skip method check, to allow TTLS extension. // throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, string_printf(__FUNCTION__ " Packet is not EAP-TLS (expected: %u, received: %u).", eap_type_tls, pReceivedPacket->Data[0])); // Get packet data pointer and size for more readable code later on. const unsigned char *packet_data_ptr; size_t packet_data_size; if (pReceivedPacket->Data[1] & flags_req_length_incl) { // Length field is included. packet_data_ptr = pReceivedPacket->Data + 6; packet_data_size = dwReceivedPacketSize - 10; } else { // Length field not included. packet_data_ptr = pReceivedPacket->Data + 2; packet_data_size = dwReceivedPacketSize - 6; } // Do the TLS defragmentation. if (pReceivedPacket->Data[1] & flags_req_more_frag) { if (m_packet_req.m_data.empty()) { // Start a new packet. if (pReceivedPacket->Data[1] & flags_req_length_incl) { // Preallocate data according to the Length field. size_t size_tot = ntohl(*(unsigned int*)(pReceivedPacket->Data + 2)); m_packet_req.m_data.reserve(size_tot); m_module.log_event(&EAPMETHOD_TLS_PACKET_RECV_FRAG_FIRST, event_data((unsigned int)eap_type_tls), event_data((unsigned int)packet_data_size), event_data((unsigned int)size_tot), event_data::blank); } else { // The Length field was not included. Odd. Nevermind, no pre-allocation then. m_module.log_event(&EAPMETHOD_TLS_PACKET_RECV_FRAG_FIRST1, event_data((unsigned int)eap_type_tls), event_data((unsigned int)packet_data_size), event_data::blank); } } else { // Mid fragment received. m_module.log_event(&EAPMETHOD_TLS_PACKET_RECV_FRAG_MID, event_data((unsigned int)eap_type_tls), event_data((unsigned int)packet_data_size), event_data((unsigned int)m_packet_req.m_data.size()), event_data::blank); } m_packet_req.m_data.insert(m_packet_req.m_data.end(), packet_data_ptr, packet_data_ptr + packet_data_size); // Reply with ACK packet. m_packet_res.m_code = EapCodeResponse; m_packet_res.m_id = pReceivedPacket->Id; m_packet_res.m_flags = 0; m_packet_res.m_data.clear(); pEapOutput->fAllowNotifications = FALSE; pEapOutput->action = EapPeerMethodResponseActionSend; return; } else if (!m_packet_req.m_data.empty()) { // Last fragment received. Append data. m_packet_req.m_data.insert(m_packet_req.m_data.end(), packet_data_ptr, packet_data_ptr + packet_data_size); m_module.log_event(&EAPMETHOD_TLS_PACKET_RECV_FRAG_LAST, event_data((unsigned int)eap_type_tls), event_data((unsigned int)packet_data_size), event_data((unsigned int)m_packet_req.m_data.size()), event_data::blank); } else { // This is a complete non-fragmented packet. m_packet_req.m_data.assign(packet_data_ptr, packet_data_ptr + packet_data_size); m_module.log_event(&EAPMETHOD_TLS_PACKET_RECV, event_data((unsigned int)eap_type_tls), event_data((unsigned int)packet_data_size), event_data::blank); } m_packet_req.m_code = (EapCode)pReceivedPacket->Code; m_packet_req.m_id = pReceivedPacket->Id; m_packet_req.m_flags = pReceivedPacket->Data[1]; if (m_packet_res.m_flags & flags_res_more_frag) { // We are sending a fragmented message. if ( m_packet_req.m_code == EapCodeRequest && m_packet_req.m_id == m_packet_res.m_id && m_packet_req.m_data.empty() && !(m_packet_req.m_flags & (flags_req_length_incl | flags_req_more_frag | flags_req_start))) { // This is the ACK of our fragmented message packet. Send the next fragment. m_packet_res.m_id++; pEapOutput->fAllowNotifications = FALSE; pEapOutput->action = EapPeerMethodResponseActionSend; return; } else throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, string_printf(__FUNCTION__ " ACK expected, received %u-%u-%x.", m_packet_req.m_code, m_packet_req.m_id, m_packet_req.m_flags)); } m_packet_res.m_code = EapCodeResponse; m_packet_res.m_id = m_packet_req.m_id; m_packet_res.m_flags = 0; if (pReceivedPacket->Code == EapCodeRequest && (m_packet_req.m_flags & flags_req_start)) { // This is the TLS start message: (re)initialize method. m_module.log_event(&EAPMETHOD_TLS_HANDSHAKE_START2, event_data((unsigned int)eap_type_tls), event_data::blank); m_key_mppe_client.clear(); m_key_mppe_server.clear(); m_server_cert_chain.clear(); // Create handshake hashing objects. if (!m_hash_handshake_msgs_md5.create(m_cp, CALG_MD5)) throw win_runtime_error(__FUNCTION__ " Error creating MD5 hashing object."); if (!m_hash_handshake_msgs_sha1.create(m_cp, CALG_SHA1)) throw win_runtime_error(__FUNCTION__ " Error creating SHA-1 hashing object."); if (!m_hash_handshake_msgs_sha256.create(m_cp, CALG_SHA_256)) throw win_runtime_error(__FUNCTION__ " Error creating SHA-256 hashing object."); m_certificate_req = false; m_server_hello_done = false; m_server_finished = false; m_seq_num_client = 0; m_seq_num_server = 0; // Build client hello packet. sanitizing_blob msg_client_hello(make_message(tls_message_type_handshake, make_client_hello())); m_packet_res.m_data.assign(msg_client_hello.begin(), msg_client_hello.end()); } else { // Process the packet. m_packet_res.m_data.clear(); process_packet(m_packet_req.m_data.data(), m_packet_req.m_data.size()); if (m_server_finished) { // Server finished. } else if (m_state_server.m_alg_encrypt) { // Cipher specified (server). } else if (m_server_hello_done) { // Server hello specified. // Create cryptographics provider (based on server selected cipher?). if (!m_cp_enc.create(NULL, NULL, PROV_RSA_AES)) throw win_runtime_error(__FUNCTION__ " Error creating cryptographics provider."); // Do we trust this server? if (m_server_cert_chain.empty()) throw win_runtime_error(ERROR_ENCRYPTION_FAILED, __FUNCTION__ " Can not continue without server's certificate."); verify_server_trust(); if (m_certificate_req) { // Client certificate requested. sanitizing_blob msg_client_cert(make_message(tls_message_type_handshake, make_client_cert())); m_packet_res.m_data.insert(m_packet_res.m_data.end(), msg_client_cert.begin(), msg_client_cert.end()); } { // Generate pre-master secret. PMS will get sanitized in its destructor when going out-of-scope. tls_master_secret pms(m_cp_enc, m_tls_version); // Derive master secret. static const unsigned char s_label[] = "master secret"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1); seed.insert(seed.end(), (const unsigned char*)&m_random_client, (const unsigned char*)(&m_random_client + 1)); seed.insert(seed.end(), (const unsigned char*)&m_random_server, (const unsigned char*)(&m_random_server + 1)); memcpy(&m_master_secret, prf(m_cp_enc, m_alg_prf, pms, seed, sizeof(tls_master_secret)).data(), sizeof(tls_master_secret)); // Create client key exchange message, and append to packet. sanitizing_blob msg_client_key_exchange(make_message(tls_message_type_handshake, make_client_key_exchange(pms))); m_packet_res.m_data.insert(m_packet_res.m_data.end(), msg_client_key_exchange.begin(), msg_client_key_exchange.end()); } if (m_certificate_req) { // TODO: Create and append certificate_verify message! } // Append change cipher spec to packet. sanitizing_blob ccs(make_change_chiper_spec()); m_packet_res.m_data.insert(m_packet_res.m_data.end(), ccs.begin(), ccs.end()); { // Adopt server provided pending state as client pending. m_state_client_pending = m_state_server_pending; // Derive client side keys static const unsigned char s_label[] = "key expansion"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1); seed.insert(seed.end(), (const unsigned char*)&m_random_server, (const unsigned char*)(&m_random_server + 1)); seed.insert(seed.end(), (const unsigned char*)&m_random_client, (const unsigned char*)(&m_random_client + 1)); sanitizing_blob key_block(prf(m_cp_enc, m_alg_prf, m_master_secret, seed, 2*m_state_client_pending.m_size_mac_key + // client_write_MAC_secret & server_write_MAC_secret (SHA1) 2*m_state_client_pending.m_size_enc_key + // client_write_key & server_write_key 2*m_state_client_pending.m_size_enc_iv )); // client_write_IV & server_write_IV const unsigned char *_key_block = key_block.data(); // client_write_MAC_secret m_state_client_pending.m_padding_hmac = hmac_padding(m_cp_enc, m_state_client_pending.m_alg_mac, _key_block, m_state_client_pending.m_size_mac_key); _key_block += m_state_client_pending.m_size_mac_key; // server_write_MAC_secret _key_block += m_state_client_pending.m_size_mac_key; // client_write_key m_state_client_pending.m_key = create_key(m_state_client_pending.m_alg_encrypt, m_key_exp1, _key_block, m_state_client_pending.m_size_enc_key); _key_block += m_state_client_pending.m_size_enc_key; // server_write_key _key_block += m_state_client_pending.m_size_enc_key; if (m_state_client_pending.m_size_enc_iv && m_tls_version < tls_version_1_1) { // client_write_IV if (!CryptSetKeyParam(m_state_client_pending.m_key, KP_IV, _key_block, 0)) throw win_runtime_error(__FUNCTION__ " Error setting client_write_IV."); _key_block += m_state_client_pending.m_size_enc_iv; } // Accept client pending state as current client state. m_state_client = std::move(m_state_client_pending); } // Create finished message, and append to packet. sanitizing_blob msg_finished(make_message(tls_message_type_handshake, make_finished())); m_packet_res.m_data.insert(m_packet_res.m_data.end(), msg_finished.begin(), msg_finished.end()); } } // Request packet was processed. Clear its data since we use the absence of data to detect first of fragmented message packages. m_packet_req.m_data.clear(); pEapOutput->fAllowNotifications = FALSE; pEapOutput->action = EapPeerMethodResponseActionSend; } void eap::method_tls::get_response_packet( _Inout_bytecap_(*dwSendPacketSize) EapPacket *pSendPacket, _Inout_ DWORD *pdwSendPacketSize) { assert(pdwSendPacketSize); assert(pSendPacket); unsigned int size_data = (unsigned int)m_packet_res.m_data.size(), size_packet = size_data + 6; unsigned short size_packet_limit = (unsigned short)std::min(*pdwSendPacketSize, USHRT_MAX); unsigned char *data_dst; if (!(m_packet_res.m_flags & flags_res_more_frag)) { // Not fragmented. if (size_packet <= size_packet_limit) { // No need to fragment the packet. m_packet_res.m_flags &= ~flags_res_length_incl; // No need to explicitly include the Length field either. data_dst = pSendPacket->Data + 2; m_module.log_event(&EAPMETHOD_TLS_PACKET_SEND, event_data((unsigned int)eap_type_tls), event_data((unsigned int)size_data), event_data::blank); } else { // But it should be fragmented. m_packet_res.m_flags |= flags_res_length_incl | flags_res_more_frag; *(unsigned int*)(pSendPacket->Data + 2) = (unsigned int)size_packet; data_dst = pSendPacket->Data + 6; size_data = size_packet_limit - 10; size_packet = size_packet_limit; m_module.log_event(&EAPMETHOD_TLS_PACKET_SEND_FRAG_FIRST, event_data((unsigned int)eap_type_tls), event_data((unsigned int)size_data), event_data((unsigned int)(m_packet_res.m_data.size() - size_data)), event_data::blank); } } else { // Continuing the fragmented packet... if (size_packet > size_packet_limit) { // This is a mid fragment. m_packet_res.m_flags &= ~flags_res_length_incl; size_data = size_packet_limit - 6; size_packet = size_packet_limit; m_module.log_event(&EAPMETHOD_TLS_PACKET_SEND_FRAG_MID, event_data((unsigned int)eap_type_tls), event_data((unsigned int)size_data), event_data((unsigned int)(m_packet_res.m_data.size() - size_data)), event_data::blank); } else { // This is the last fragment. m_packet_res.m_flags &= ~(flags_res_length_incl | flags_res_more_frag); m_module.log_event(&EAPMETHOD_TLS_PACKET_SEND_FRAG_LAST, event_data((unsigned int)eap_type_tls), event_data((unsigned int)size_data), event_data((unsigned int)(m_packet_res.m_data.size() - size_data)), event_data::blank); } data_dst = pSendPacket->Data + 2; } pSendPacket->Code = (BYTE)m_packet_res.m_code; pSendPacket->Id = m_packet_res.m_id; *(unsigned short*)pSendPacket->Length = htons((unsigned short)size_packet); pSendPacket->Data[0] = (BYTE)eap_type_tls; pSendPacket->Data[1] = m_packet_res.m_flags; memcpy(data_dst, m_packet_res.m_data.data(), size_data); m_packet_res.m_data.erase(m_packet_res.m_data.begin(), m_packet_res.m_data.begin() + size_data); *pdwSendPacketSize = size_packet; } void eap::method_tls::get_result( _In_ EapPeerMethodResultReason reason, _Inout_ EapPeerMethodResult *ppResult) { assert(ppResult); config_provider &cfg_prov(m_cfg.m_providers.front()); config_method_tls *cfg_method = dynamic_cast(cfg_prov.m_methods.front().get()); assert(cfg_method); switch (reason) { case EapPeerMethodResultSuccess: { if (!m_server_finished) throw invalid_argument(__FUNCTION__ " Premature success."); // Derive MSK. derive_msk(); // Fill array with RADIUS attributes. eap_attr a; m_eap_attr.clear(); m_eap_attr.reserve(3); a.create_ms_mppe_key(16, (LPCBYTE)&m_key_mppe_client, sizeof(tls_random)); m_eap_attr.push_back(std::move(a)); a.create_ms_mppe_key(17, (LPCBYTE)&m_key_mppe_server, sizeof(tls_random)); m_eap_attr.push_back(std::move(a)); m_eap_attr.push_back(eap_attr::blank); m_eap_attr_desc.dwNumberOfAttributes = (DWORD)m_eap_attr.size(); m_eap_attr_desc.pAttribs = m_eap_attr.data(); ppResult->pAttribArray = &m_eap_attr_desc; // Clear credentials as failed. cfg_method->m_cred_failed = false; ppResult->fIsSuccess = TRUE; ppResult->dwFailureReasonCode = ERROR_SUCCESS; // Update configuration with session resumption data and prepare BLOB. cfg_method->m_session_id = m_session_id; cfg_method->m_master_secret = m_master_secret; break; } case EapPeerMethodResultFailure: // Clear session resumption data. cfg_method->m_session_id.clear(); cfg_method->m_master_secret.clear(); // Mark credentials as failed, so GUI can re-prompt user. cfg_method->m_cred_failed = true; ppResult->fIsSuccess = FALSE; ppResult->dwFailureReasonCode = EAP_E_AUTHENTICATION_FAILED; break; default: throw win_runtime_error(ERROR_NOT_SUPPORTED, __FUNCTION__ " Not supported."); } // Always ask EAP host to save the connection data. ppResult->fSaveConnectionData = TRUE; m_module.pack(m_cfg, &ppResult->pConnectionData, &ppResult->dwSizeofConnectionData); if (m_blob_cfg) m_module.free_memory(m_blob_cfg); m_blob_cfg = ppResult->pConnectionData; #ifdef EAP_USE_NATIVE_CREDENTIAL_CACHE ppResult->fSaveUserData = TRUE; m_module.pack(m_cred, &ppResult->pUserData, &ppResult->dwSizeofUserData); if (m_blob_cred) m_module.free_memory(m_blob_cred); m_blob_cred = ppResult->pUserData; #endif } eap::sanitizing_blob eap::method_tls::make_client_hello() { static const unsigned char s_cipher_suite[] = { 0x00, 0x2f, // TLS_RSA_WITH_AES_128_CBC_SHA (required by TLS 1.2) 0x00, 0x0a, // TLS_RSA_WITH_3DES_EDE_CBC_SHA (required by EAP-TLS) }; size_t size_data; sanitizing_blob msg; msg.reserve( 4 + // SSL header (size_data = 2 + // SSL version sizeof(tls_random) + // Client random 1 + // Session ID size m_session_id.size() + // Session ID 2 + // Length of cypher suite list sizeof(s_cipher_suite) + // Cipher suite list 1 + // Length of compression suite 1)); // Compression suite // SSL header assert(size_data <= 0xffffff); unsigned int ssl_header = htonl((tls_handshake_type_client_hello << 24) | (unsigned int)size_data); msg.insert(msg.end(), (unsigned char*)&ssl_header, (unsigned char*)(&ssl_header + 1)); // SSL version msg.insert(msg.end(), (unsigned char*)&m_tls_version, (unsigned char*)(&m_tls_version + 1)); // Generate client random and add it to the message m_random_client.randomize(m_cp); msg.insert(msg.end(), (unsigned char*)&m_random_client, (unsigned char*)(&m_random_client + 1)); // Session ID assert(m_session_id.size() <= 32); msg.push_back((unsigned char)m_session_id.size()); msg.insert(msg.end(), m_session_id.begin(), m_session_id.end()); // Cypher suite list unsigned short size_cipher_suite2 = htons((unsigned short)sizeof(s_cipher_suite)); msg.insert(msg.end(), (unsigned char*)&size_cipher_suite2, (unsigned char*)(&size_cipher_suite2 + 1)); msg.insert(msg.end(), s_cipher_suite, s_cipher_suite + _countof(s_cipher_suite)); // Compression msg.push_back(0x01); // Length of compression section msg.push_back(0x00); // No compression (0) return msg; } eap::sanitizing_blob eap::method_tls::make_client_cert() const { // Select client certificate. PCCERT_CONTEXT cert = m_cred.m_cert ? m_cred.m_cert : NULL; size_t size_data, size_list; sanitizing_blob msg; msg.reserve( 4 + // SSL header (size_data = 3 + // Certificate list size (size_list = (cert ? 3 + cert->cbCertEncoded : 0)))); // Certificate (optional) // SSL header assert(size_data <= 0xffffff); unsigned int ssl_header = htonl((tls_handshake_type_certificate << 24) | (unsigned int)size_data); msg.insert(msg.end(), (unsigned char*)&ssl_header, (unsigned char*)(&ssl_header + 1)); // List size assert(size_list <= 0xffffff); msg.push_back((unsigned char)((size_list >> 16) & 0xff)); msg.push_back((unsigned char)((size_list >> 8) & 0xff)); msg.push_back((unsigned char)((size_list ) & 0xff)); if (cert) { // Cert size assert(cert->cbCertEncoded <= 0xffffff); msg.push_back((unsigned char)((cert->cbCertEncoded >> 16) & 0xff)); msg.push_back((unsigned char)((cert->cbCertEncoded >> 8) & 0xff)); msg.push_back((unsigned char)((cert->cbCertEncoded ) & 0xff)); msg.insert(msg.end(), cert->pbCertEncoded, cert->pbCertEncoded + cert->cbCertEncoded); } return msg; } eap::sanitizing_blob eap::method_tls::make_client_key_exchange(_In_ const tls_master_secret &pms) const { // Encrypt pre-master key first. sanitizing_blob pms_enc((const unsigned char*)&pms, (const unsigned char*)(&pms + 1)); crypt_key key; if (!key.import_public(m_cp_enc, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, &(m_server_cert_chain.front()->pCertInfo->SubjectPublicKeyInfo))) throw win_runtime_error(__FUNCTION__ " Error importing server's public key."); if (!CryptEncrypt(key, NULL, TRUE, 0, pms_enc)) throw win_runtime_error(__FUNCTION__ " Error encrypting PMS."); size_t size_data, size_pms_enc = pms_enc.size(); sanitizing_blob msg; msg.reserve( 4 + // SSL header (size_data = 2 + // Encrypted pre master secret size size_pms_enc)); // Encrypted pre master secret // SSL header assert(size_data <= 0xffffff); unsigned int ssl_header = htonl((tls_handshake_type_client_key_exchange << 24) | (unsigned int)size_data); msg.insert(msg.end(), (unsigned char*)&ssl_header, (unsigned char*)(&ssl_header + 1)); // Encrypted pre master secret size assert(size_pms_enc <= 0xffff); msg.push_back((unsigned char)((size_pms_enc >> 8) & 0xff)); msg.push_back((unsigned char)((size_pms_enc ) & 0xff)); // Encrypted pre master secret #ifdef _HOST_LOW_ENDIAN std::reverse(pms_enc.begin(), pms_enc.end()); #endif msg.insert(msg.end(), pms_enc.begin(), pms_enc.end()); return msg; } eap::sanitizing_blob eap::method_tls::make_change_chiper_spec() const { const unsigned char msg_css[] = { tls_message_type_change_cipher_spec, // SSL record type m_tls_version.major, // SSL major version m_tls_version.minor, // SSL minor version 0, // Message size (high-order byte) 1, // Message size (low-order byte) 1, // Message: change_cipher_spec is always "1" }; return sanitizing_blob(msg_css, msg_css + _countof(msg_css)); } eap::sanitizing_blob eap::method_tls::make_finished() const { sanitizing_blob msg; msg.reserve( 4 + // SSL header 12); // verify_data is 12B // SSL header unsigned int ssl_header = htonl((unsigned int)(tls_handshake_type_finished << 24) | 12); msg.insert(msg.end(), (unsigned char*)&ssl_header, (unsigned char*)(&ssl_header + 1)); // Create label + hash MD5 + hash SHA-1 seed. crypt_hash hash; static const unsigned char s_label[] = "client finished"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1), hash_data; if (m_tls_version < tls_version_1_2) { hash = m_hash_handshake_msgs_md5; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing MD5 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); hash = m_hash_handshake_msgs_sha1; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing SHA-1 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); } else { hash = m_hash_handshake_msgs_sha256; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing SHA-256 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); } sanitizing_blob verify(prf(m_cp_enc, m_alg_prf, m_master_secret, seed, 12)); msg.insert(msg.end(), verify.begin(), verify.end()); return msg; } eap::sanitizing_blob eap::method_tls::make_message(_In_ tls_message_type_t type, _Inout_ sanitizing_blob &&data) { if (type == tls_message_type_handshake) hash_handshake(data); if (m_state_client.m_alg_encrypt) encrypt_message(type, data); size_t size_data = data.size(); assert(size_data <= 0xffff); message_header hdr = { type, // SSL record type { m_tls_version.major, // SSL major version m_tls_version.minor, // SSL minor version }, { // Data length (unencrypted, network byte order) (unsigned char)((size_data >> 8) & 0xff), (unsigned char)((size_data ) & 0xff), } }; sanitizing_blob msg; msg.reserve(sizeof(message_header) + size_data); msg.assign((const unsigned char*)&hdr, (const unsigned char*)(&hdr + 1)); msg.insert(msg.end(), data.begin(), data.end()); return msg; } void eap::method_tls::derive_msk() { static const unsigned char s_label[] = "client EAP encryption"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1); seed.insert(seed.end(), (const unsigned char*)&m_random_client, (const unsigned char*)(&m_random_client + 1)); seed.insert(seed.end(), (const unsigned char*)&m_random_server, (const unsigned char*)(&m_random_server + 1)); sanitizing_blob key_block(prf(m_cp_enc, m_alg_prf, m_master_secret, seed, 2*sizeof(tls_random))); const unsigned char *_key_block = key_block.data(); // MS-MPPE-Recv-Key memcpy(&m_key_mppe_client, _key_block, sizeof(tls_random)); _key_block += sizeof(tls_random); // MS-MPPE-Send-Key memcpy(&m_key_mppe_server, _key_block, sizeof(tls_random)); _key_block += sizeof(tls_random); } void eap::method_tls::process_packet(_In_bytecount_(size_pck) const void *_pck, _In_ size_t size_pck) { sanitizing_blob data; for (const unsigned char *pck = (const unsigned char*)_pck, *pck_end = pck + size_pck; pck < pck_end; ) { if (pck + 5 > pck_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete message header."); const message_header *hdr = (const message_header*)pck; const unsigned char *msg = (const unsigned char*)(hdr + 1), *msg_end = msg + ntohs(*(unsigned short*)hdr->length); if (msg_end > pck_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete message data."); if (hdr->version >= tls_version_1_0) { // Process TLS 1.0 message. switch (hdr->type) { case tls_message_type_change_cipher_spec: process_change_cipher_spec(msg, msg_end - msg); break; case tls_message_type_alert: if (m_state_server.m_alg_encrypt) { sanitizing_blob msg_dec(msg, msg_end); decrypt_message(hdr->type, msg_dec); process_alert(msg_dec.data(), msg_dec.size()); } else process_alert(msg, msg_end - msg); break; case tls_message_type_handshake: if (m_state_server.m_alg_encrypt) { sanitizing_blob msg_dec(msg, msg_end); decrypt_message(hdr->type, msg_dec); process_handshake(msg_dec.data(), msg_dec.size()); } else process_handshake(msg, msg_end - msg); break; case tls_message_type_application_data: { if (!m_state_server.m_alg_encrypt) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Application data should be encrypted."); sanitizing_blob msg_dec(msg, msg_end); decrypt_message(hdr->type, msg_dec); process_application_data(msg_dec.data(), msg_dec.size()); break; } //default: // if (m_state_server.m_alg_encrypt) { // sanitizing_blob msg_dec(msg, msg_end); // decrypt_message(hdr->type, msg_dec); // process_vendor_data(hdr->type, msg_dec.data(), msg_dec.size()); // } else // process_vendor_data(hdr->type, msg, msg_end - msg); } } pck = msg_end; } } void eap::method_tls::process_change_cipher_spec(_In_bytecount_(msg_size) const void *_msg, _In_ size_t msg_size) { if (msg_size < 1) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete change cipher spec."); const unsigned char *msg = (const unsigned char*)_msg; if (msg[0] != 1) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, string_printf(__FUNCTION__ " Invalid change cipher spec message (expected 1, received %u).", msg[0])); m_module.log_event(&EAPMETHOD_TLS_CHANGE_CIPHER_SPEC, event_data((unsigned int)eap_type_tls), event_data::blank); static const unsigned char s_label[] = "key expansion"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1); seed.insert(seed.end(), (const unsigned char*)&m_random_server, (const unsigned char*)(&m_random_server + 1)); seed.insert(seed.end(), (const unsigned char*)&m_random_client, (const unsigned char*)(&m_random_client + 1)); sanitizing_blob key_block(prf(m_cp_enc, m_alg_prf, m_master_secret, seed, 2*m_state_server_pending.m_size_mac_key + // client_write_MAC_secret & server_write_MAC_secret (SHA1) 2*m_state_server_pending.m_size_enc_key + // client_write_key & server_write_key 2*m_state_server_pending.m_size_enc_iv )); // client_write_IV & server_write_IV const unsigned char *_key_block = key_block.data(); // client_write_MAC_secret _key_block += m_state_server_pending.m_size_mac_key; // server_write_MAC_secret m_state_server_pending.m_padding_hmac = hmac_padding(m_cp_enc, m_state_server_pending.m_alg_mac, _key_block, m_state_server_pending.m_size_mac_key); _key_block += m_state_server_pending.m_size_mac_key; // client_write_key _key_block += m_state_server_pending.m_size_enc_key; // server_write_key m_state_server_pending.m_key = create_key(m_state_server_pending.m_alg_encrypt, m_key_exp1, _key_block, m_state_server_pending.m_size_enc_key); _key_block += m_state_server_pending.m_size_enc_key; if (m_state_server_pending.m_size_enc_iv && m_tls_version < tls_version_1_1) { // client_write_IV _key_block += m_state_server_pending.m_size_enc_iv; // server_write_IV if (!CryptSetKeyParam(m_state_server_pending.m_key, KP_IV, _key_block, 0)) throw win_runtime_error(__FUNCTION__ " Error setting server_write_IV."); _key_block += m_state_server_pending.m_size_enc_iv; } // Accept server pending state as current server state. m_state_server = std::move(m_state_server_pending); } void eap::method_tls::process_alert(_In_bytecount_(msg_size) const void *_msg, _In_ size_t msg_size) { if (msg_size < 2) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete alert."); const unsigned char *msg = (const unsigned char*)_msg; m_module.log_event(&EAPMETHOD_TLS_ALERT, event_data((unsigned int)eap_type_tls), event_data((unsigned char)msg[0]), event_data((unsigned char)msg[1]), event_data::blank); //if (msg[0] == alert_level_fatal) { // // Clear session ID to avoid reconnection attempts. // m_session_id.clear(); //} } void eap::method_tls::process_handshake(_In_bytecount_(msg_size) const void *_msg, _In_ size_t msg_size) { for (const unsigned char *msg = (const unsigned char*)_msg, *msg_end = msg + msg_size; msg < msg_end; ) { // Parse record header. if (msg + sizeof(unsigned int) > msg_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete record header."); unsigned int hdr = ntohl(*(unsigned int*)msg); const unsigned char *rec = msg + sizeof(unsigned int), *rec_end = rec + (hdr & 0xffffff); if (rec_end > msg_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Incomplete record data."); // Process record. tls_handshake_type_t type = (tls_handshake_type_t)((hdr >> 24) & 0xff); switch (type) { case tls_handshake_type_server_hello: // TLS version if (rec + 2 > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Server SSL/TLS version missing or incomplete."); else if (*(tls_version*)rec < tls_version_1_0 || m_tls_version < *(tls_version*)rec) throw win_runtime_error(ERROR_NOT_SUPPORTED, __FUNCTION__ " Unsupported SSL/TLS version."); m_tls_version = *(tls_version*)rec; m_alg_prf = m_tls_version < tls_version_1_2 ? CALG_TLS1PRF : CALG_SHA_256; rec += 2; // Server random if (rec + sizeof(tls_random) > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Server random missing or incomplete."); memcpy(&m_random_server, rec, sizeof(tls_random)); rec += sizeof(tls_random); // Session ID if (rec + 1 > rec_end || rec + 1 + rec[0] > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Session ID missing or incomplete."); assert(rec[0] <= 32); // According to RFC 5246 session IDs should not be longer than 32B. m_session_id.assign(rec + 1, rec + 1 + rec[0]); rec += rec[0] + 1; // Cipher if (rec + 2 > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Cipher or incomplete."); if (rec[0] == 0x00 || rec[1] == 0x2f) { // TLS_RSA_WITH_AES_128_CBC_SHA m_state_server_pending.m_alg_encrypt = CALG_AES_128; m_state_server_pending.m_size_enc_key = 128/8; // AES-128 m_state_server_pending.m_size_enc_iv = 128/8; // AES-128 m_state_server_pending.m_size_enc_block = 128/8; // AES-128 m_state_server_pending.m_alg_mac = CALG_SHA1; m_state_server_pending.m_size_mac_key = 160/8; // SHA-1 m_state_server_pending.m_size_mac_hash = 160/8; // SHA-1 } else if (rec[0] == 0x00 || rec[1] == 0x0a) { // TLS_RSA_WITH_3DES_EDE_CBC_SHA m_state_server_pending.m_alg_encrypt = CALG_3DES; m_state_server_pending.m_size_enc_key = 192/8; // 3DES 192bits m_state_server_pending.m_size_enc_iv = 64/8; // 3DES 64bits m_state_server_pending.m_size_enc_block = 64/8; // 3DES 64bits m_state_server_pending.m_alg_mac = CALG_SHA1; m_state_server_pending.m_size_mac_key = 160/8; // SHA-1 m_state_server_pending.m_size_mac_hash = 160/8; // SHA-1 } else throw win_runtime_error(ERROR_NOT_SUPPORTED, string_printf(__FUNCTION__ " Other than requested cipher selected (received 0x%02x%02x).", rec[0], rec[1])); m_module.log_event(&EAPMETHOD_TLS_SERVER_HELLO1, event_data((unsigned int)eap_type_tls), event_data(((unsigned int)m_tls_version.major << 8) | (unsigned int)m_tls_version.minor), event_data((unsigned int)m_session_id.size()), event_data(m_session_id.data(), (ULONG)m_session_id.size()), event_data::blank); break; case tls_handshake_type_certificate: { // Certificate list size if (rec + 3 > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Certificate list size missing or incomplete."); const unsigned char *list = rec + 3, *list_end = list + ((rec[0] << 16) | (rec[1] << 8) | rec[2]); if (list_end > rec_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Certificate list missing or incomplete."); m_server_cert_chain.clear(); while (list < list_end) { // Certificate size if (list + 3 > list_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Certificate size missing or incomplete."); const unsigned char *cert = list + 3, *cert_end = cert + ((list[0] << 16) | (list[1] << 8) | list[2]); if (cert_end > list_end) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Certificate rec missing or incomplete."); // Certificate cert_context c; if (!c.create(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, cert, (DWORD)(cert_end - cert))) throw win_runtime_error(__FUNCTION__ " Error reading certificate."); m_server_cert_chain.push_back(std::move(c)); list = cert_end; } wstring cert_name(!m_server_cert_chain.empty() ? get_cert_title(m_server_cert_chain.front()) : L""); m_module.log_event(&EAPMETHOD_TLS_CERTIFICATE, event_data((unsigned int)eap_type_tls), event_data(cert_name), event_data::blank); break; } case tls_handshake_type_certificate_request: m_certificate_req = true; m_module.log_event(&EAPMETHOD_TLS_CERTIFICATE_REQUEST, event_data((unsigned int)eap_type_tls), event_data::blank); break; case tls_handshake_type_server_hello_done: m_server_hello_done = true; m_module.log_event(&EAPMETHOD_TLS_SERVER_HELLO_DONE, event_data((unsigned int)eap_type_tls), event_data::blank); break; case tls_handshake_type_finished: { if (!m_state_server.m_alg_encrypt) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, __FUNCTION__ " Finished message should be encrypted."); // According to https://tools.ietf.org/html/rfc5246#section-7.4.9 all verify_data is 12B. if (rec_end - rec != 12) throw win_runtime_error(EAP_E_EAPHOST_METHOD_INVALID_PACKET, string_printf(__FUNCTION__ " Finished record size incorrect (expected 12B, received %uB).", rec_end - rec)); // Create label + hash MD5 + hash SHA-1 seed. crypt_hash hash; static const unsigned char s_label[] = "server finished"; sanitizing_blob seed(s_label, s_label + _countof(s_label) - 1), hash_data; if (m_tls_version < tls_version_1_2) { hash = m_hash_handshake_msgs_md5; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing MD5 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); hash = m_hash_handshake_msgs_sha1; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing SHA-1 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); } else { hash = m_hash_handshake_msgs_sha256; // duplicate if (!CryptGetHashParam(hash, HP_HASHVAL, hash_data, 0)) throw win_runtime_error(__FUNCTION__ " Error finishing SHA-256 hash calculation."); seed.insert(seed.end(), hash_data.begin(), hash_data.end()); } if (memcmp(prf(m_cp_enc, m_alg_prf, m_master_secret, seed, 12).data(), rec, 12)) throw win_runtime_error(ERROR_ENCRYPTION_FAILED, __FUNCTION__ " Integrity check failed."); m_server_finished = true; m_module.log_event(&EAPMETHOD_TLS_FINISHED, event_data((unsigned int)eap_type_tls), event_data::blank); break; } default: m_module.log_event(&EAPMETHOD_TLS_HANDSHAKE_IGNORE, event_data((unsigned int)eap_type_tls), event_data((unsigned char)type), event_data::blank); } msg = rec_end; } hash_handshake(_msg, msg_size); } void eap::method_tls::process_application_data(_In_bytecount_(msg_size) const void *msg, _In_ size_t msg_size) { UNREFERENCED_PARAMETER(msg); UNREFERENCED_PARAMETER(msg_size); // TODO: Parse application data (Diameter AVP) } //void eap::method_tls::process_vendor_data(_In_ tls_message_type_t type, _In_bytecount_(msg_size) const void *msg, _In_ size_t msg_size) //{ // UNREFERENCED_PARAMETER(type); // UNREFERENCED_PARAMETER(msg); // UNREFERENCED_PARAMETER(msg_size); //} void eap::method_tls::verify_server_trust() const { assert(!m_server_cert_chain.empty()); const cert_context &cert = m_server_cert_chain.front(); const config_provider &cfg_prov(m_cfg.m_providers.front()); const config_method_tls *cfg_method = dynamic_cast(cfg_prov.m_methods.front().get()); assert(cfg_method); if (!cfg_method->m_server_names.empty()) { // Check server name. string subj; if (!CertGetNameStringA(cert, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, subj)) throw win_runtime_error(__FUNCTION__ " Error retrieving server's certificate subject name."); for (list::const_iterator s = cfg_method->m_server_names.cbegin(), s_end = cfg_method->m_server_names.cend();; ++s) { if (s != s_end) { const char *a = s->c_str(), *b = subj.c_str(); size_t len_a = s->length(), len_b = subj.length(); if (_stricmp(a, b) == 0 || // Direct match a[0] == '*' && len_b + 1 >= len_a && _stricmp(a + 1, b + len_b - (len_a - 1)) == 0) // "*..." wildchar match { m_module.log_event(&EAPMETHOD_TLS_SERVER_NAME_TRUSTED, event_data(subj), event_data::blank); break; } } else throw win_runtime_error(ERROR_INVALID_DOMAINNAME, string_printf(__FUNCTION__ " Server name %s is not on the list of trusted server names.", subj.c_str()).c_str()); } } // Create temporary certificate store of our trusted root CAs. cert_store store; if (!store.create(CERT_STORE_PROV_MEMORY, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, NULL, 0, NULL)) throw win_runtime_error(ERROR_INVALID_DOMAINNAME, __FUNCTION__ " Error creating temporary certificate store."); for (list::const_iterator c = cfg_method->m_trusted_root_ca.cbegin(), c_end = cfg_method->m_trusted_root_ca.cend(); c != c_end; ++c) CertAddCertificateContextToStore(store, *c, CERT_STORE_ADD_REPLACE_EXISTING, NULL); // Add all certificates from the server's certificate chain, except the first one. for (list::const_iterator c = m_server_cert_chain.cbegin(), c_end = m_server_cert_chain.cend(); ++c != c_end;) CertAddCertificateContextToStore(store, *c, CERT_STORE_ADD_REPLACE_EXISTING, NULL); // Prepare the certificate chain validation, and check. CERT_CHAIN_PARA chain_params = { sizeof(chain_params), // cbSize { USAGE_MATCH_TYPE_AND, // RequestedUsage.dwType {}, // RequestedUsage.Usage }, #ifdef CERT_CHAIN_PARA_HAS_EXTRA_FIELDS {}, // RequestedIssuancePolicy 1, // dwUrlRetrievalTimeout (1ms to speed up checking) #else #define _S2(x) #x #define _S(x) _S2(x) #pragma message(__FILE__ "(" _S(__LINE__) "): warning X0000: Please define CERT_CHAIN_PARA_HAS_EXTRA_FIELDS constant when compiling this project.") #endif }; cert_chain_context context; if (!context.create(NULL, cert, NULL, store, &chain_params, 0)) throw win_runtime_error(ERROR_INVALID_DOMAINNAME, __FUNCTION__ " Error creating certificate chain context."); // Check chain validation error flags. Ignore CERT_TRUST_IS_UNTRUSTED_ROOT flag when we check root CA explicitly. if (context->TrustStatus.dwErrorStatus != CERT_TRUST_NO_ERROR && (cfg_method->m_trusted_root_ca.empty() || (context->TrustStatus.dwErrorStatus & ~CERT_TRUST_IS_UNTRUSTED_ROOT) != CERT_TRUST_NO_ERROR)) throw win_runtime_error(context->TrustStatus.dwErrorStatus, "Error validating certificate chain."); if (!cfg_method->m_trusted_root_ca.empty()) { // Verify Root CA against our trusted root CA list if (context->cChain != 1) throw win_runtime_error(ERROR_NOT_SUPPORTED, __FUNCTION__ " Multiple chain verification not supported."); if (context->rgpChain[0]->cElement == 0) throw win_runtime_error(ERROR_NOT_SUPPORTED, __FUNCTION__ " Can not verify empty certificate chain."); PCCERT_CONTEXT cert_root = context->rgpChain[0]->rgpElement[context->rgpChain[0]->cElement-1]->pCertContext; for (list::const_iterator c = cfg_method->m_trusted_root_ca.cbegin(), c_end = cfg_method->m_trusted_root_ca.cend();; ++c) { if (c != c_end) { if (cert_root->cbCertEncoded == (*c)->cbCertEncoded && memcmp(cert_root->pbCertEncoded, (*c)->pbCertEncoded, cert_root->cbCertEncoded) == 0) { // Trusted root CA found. break; } } else { // Not found. throw win_runtime_error(ERROR_FILE_NOT_FOUND, __FUNCTION__ " Server's certificate not issued by one of configured trusted root CAs."); } } } m_module.log_event(&EAPMETHOD_TLS_SERVER_CERT_TRUSTED, event_data::blank); } void eap::method_tls::encrypt_message(_In_ tls_message_type_t type, _Inout_ sanitizing_blob &data) { // Hash sequence number, TLS header, and message. size_t size_data = data.size(); hmac_hash hash(m_cp_enc, m_state_client.m_alg_mac, m_state_client.m_padding_hmac); unsigned __int64 seq_num2 = htonll(m_seq_num_client); unsigned short size_data2 = htons((unsigned short)size_data); if (!CryptHashData(hash, (const BYTE*)&seq_num2 , sizeof(seq_num2 ), 0) || !CryptHashData(hash, (const BYTE*)&type , sizeof(type ), 0) || !CryptHashData(hash, (const BYTE*)&m_tls_version, sizeof(m_tls_version), 0) || !CryptHashData(hash, (const BYTE*)&size_data2 , sizeof(size_data2 ), 0) || !CryptHashData(hash, data.data() , (DWORD)size_data , 0)) throw win_runtime_error(__FUNCTION__ " Error hashing data."); sanitizing_blob hmac; hash.calculate(hmac); size_t size_data_enc = size_data + // TLS message hmac.size(); // HMAC hash if (m_state_client.m_size_enc_block) { // Block cypher if (m_tls_version >= tls_version_1_1) { // TLS 1.1+: Set random IV. data.insert(data.begin(), m_state_client.m_size_enc_iv, 0); if (!CryptGenRandom(m_cp_enc, (DWORD)m_state_client.m_size_enc_iv, data.data())) throw win_runtime_error(__FUNCTION__ " Error generating IV."); size_data_enc += m_state_client.m_size_enc_iv; } // Calculate padding. size_data_enc += 1; // Padding length unsigned char size_padding = (unsigned char)((m_state_client.m_size_enc_block - size_data_enc) % m_state_client.m_size_enc_block); size_data_enc += size_padding; // Append HMAC hash and padding. data.reserve(size_data_enc); data.insert(data.end(), hmac.begin(), hmac.end()); data.insert(data.end(), size_padding + 1, size_padding); } else { // Stream cipher // Append HMAC hash. data.reserve(size_data_enc); data.insert(data.end(), hmac.begin(), hmac.end()); } // Encrypt. assert(size_data_enc < 0xffffffff); DWORD size_data_enc2 = (DWORD)size_data_enc; if (!CryptEncrypt(m_state_client.m_key, NULL, FALSE, 0, data.data(), &size_data_enc2, (DWORD)size_data_enc)) throw win_runtime_error(__FUNCTION__ " Error encrypting message."); // Increment sequence number. m_seq_num_client++; } void eap::method_tls::decrypt_message(_In_ tls_message_type_t type, _Inout_ sanitizing_blob &data) { // Decrypt. if (!CryptDecrypt(m_state_server.m_key, NULL, FALSE, 0, data)) throw win_runtime_error(__FUNCTION__ " Error decrypting message."); if (!data.empty()) { size_t size_data = data.size(); bool padding_ok = true; if (m_state_server.m_size_enc_block) { // Check padding. Do not throw until HMAC is calculated. // [Canvel, B., "Password Interception in a SSL/TLS Channel"](http://lasecwww.epfl.ch/memo_ssl.shtml) unsigned char padding = data.back(); size_data = (size_t)padding + 1 <= size_data ? size_data - (padding + 1) : 0; for (size_t i = size_data, i_end = data.size() - 1; i < i_end; i++) if (data[i] != padding) padding_ok = false; // Remove padding. data.resize(size_data); if (m_tls_version >= tls_version_1_1) { // TLS 1.1+: Remove random IV. data.erase(data.begin(), data.begin() + m_state_server.m_size_enc_iv); size_data -= m_state_server.m_size_enc_iv; } } size_data -= m_state_server.m_size_mac_hash; // Hash sequence number, TLS header (without length), original message length, and message. hmac_hash hash(m_cp_enc, m_state_server.m_alg_mac, m_state_server.m_padding_hmac); unsigned __int64 seq_num2 = htonll(m_seq_num_server); unsigned short size_data2 = htons((unsigned short)size_data); if (!CryptHashData(hash, (const BYTE*)&seq_num2 , sizeof(seq_num2 ), 0) || !CryptHashData(hash, (const BYTE*)&type , sizeof(type ), 0) || !CryptHashData(hash, (const BYTE*)&m_tls_version, sizeof(m_tls_version), 0) || !CryptHashData(hash, (const BYTE*)&size_data2 , sizeof(size_data2 ), 0) || !CryptHashData(hash, data.data() , (DWORD)size_data , 0)) throw win_runtime_error(__FUNCTION__ " Error hashing data."); sanitizing_blob hmac; hash.calculate(hmac); // // Check padding results. if (!padding_ok) throw invalid_argument(__FUNCTION__ " Incorrect message padding."); // Verify hash. if (memcmp(&*(data.begin() + size_data), hmac.data(), m_state_server.m_size_mac_hash) != 0) throw win_runtime_error(ERROR_DECRYPTION_FAILED, __FUNCTION__ " Integrity check failed."); // Strip hash and padding. data.resize(size_data); // Increment sequence number. m_seq_num_server++; } } eap::sanitizing_blob eap::method_tls::prf( _In_ HCRYPTPROV cp, _In_ ALG_ID alg, _In_ const tls_master_secret &secret, _In_bytecount_(size_seed) const void *seed, _In_ size_t size_seed, _In_ size_t size) { sanitizing_blob data; data.reserve(size); if (alg == CALG_TLS1PRF) { // Split secret in two halves. size_t size_S1 = (sizeof(tls_master_secret) + 1) / 2, size_S2 = size_S1; const void *S1 = &secret, *S2 = (const unsigned char*)&secret + (sizeof(tls_master_secret) - size_S2); // Precalculate HMAC padding for speed. hmac_padding padding1(cp, CALG_MD5 , S1, size_S1), padding2(cp, CALG_SHA1, S2, size_S2); // Prepare A for p_hash. sanitizing_blob A1((unsigned char*)seed, (unsigned char*)seed + size_seed), A2((unsigned char*)seed, (unsigned char*)seed + size_seed); sanitizing_blob hmac1, hmac2; data.resize(size); for (size_t i = 0, off1 = 0, off2 = 0; i < size; ) { if (off1 >= hmac1.size()) { // Rehash A. hmac_hash hash1(cp, CALG_MD5 , padding1); if (!CryptHashData(hash1, A1.data(), (DWORD)A1.size(), 0)) throw win_runtime_error(__FUNCTION__ " Error hashing A1."); hash1.calculate(A1); // Hash A and seed. hmac_hash hash2(cp, CALG_MD5 , padding1); if (!CryptHashData(hash2, A1.data(), (DWORD)A1.size(), 0) || !CryptHashData(hash2, (const BYTE*)seed , (DWORD)size_seed, 0)) throw win_runtime_error(__FUNCTION__ " Error hashing seed,label or data."); hash2.calculate(hmac1); off1 = 0; } if (off2 >= hmac2.size()) { // Rehash A. hmac_hash hash1(cp, CALG_SHA1 , padding2); if (!CryptHashData(hash1, A2.data(), (DWORD)A2.size(), 0)) throw win_runtime_error(__FUNCTION__ " Error hashing A2."); hash1.calculate(A2); // Hash A and seed. hmac_hash hash2(cp, CALG_SHA1 , padding2); if (!CryptHashData(hash2, A2.data(), (DWORD)A2.size(), 0) || !CryptHashData(hash2, (const BYTE*)seed , (DWORD)size_seed, 0)) throw win_runtime_error(__FUNCTION__ " Error hashing seed,label or data."); hash2.calculate(hmac2); off2 = 0; } // XOR combine amount of data we have (and need). size_t i_end = std::min(i + std::min(hmac1.size() - off1, hmac2.size() - off2), size); while (i < i_end) data[i++] = hmac1[off1++] ^ hmac2[off2++]; } } else { // Precalculate HMAC padding for speed. hmac_padding padding(cp, alg, &secret, sizeof(tls_master_secret)); // Prepare A for p_hash. sanitizing_blob A((unsigned char*)seed, (unsigned char*)seed + size_seed); sanitizing_blob hmac; for (size_t i = 0; i < size; ) { // Rehash A. hmac_hash hash1(cp, alg, padding); if (!CryptHashData(hash1, A.data(), (DWORD)A.size(), 0)) throw win_runtime_error(__FUNCTION__ " Error hashing A."); hash1.calculate(A); // Hash A and seed. hmac_hash hash2(cp, alg, padding); if (!CryptHashData(hash2, A.data(), (DWORD)A.size() , 0) || !CryptHashData(hash2, (const BYTE*)seed , (DWORD)size_seed, 0)) throw win_runtime_error(__FUNCTION__ " Error hashing seed,label or data."); hash2.calculate(hmac); size_t n = std::min(hmac.size(), size - i); data.insert(data.end(), hmac.begin(), hmac.begin() + n); i += n; } } return data; } HCRYPTKEY eap::method_tls::create_key( _In_ ALG_ID alg, _In_ HCRYPTKEY key, _In_bytecount_(size_secret) const void *secret, _In_ size_t size_secret) { #if 1 UNREFERENCED_PARAMETER(key); assert(size_secret <= 0xffffffff); // Prepare exported key BLOB. struct key_blob_prefix { PUBLICKEYSTRUC header; DWORD size; } const prefix = { { PLAINTEXTKEYBLOB, CUR_BLOB_VERSION, 0, alg, }, (DWORD)size_secret, }; sanitizing_blob key_blob; key_blob.reserve(sizeof(key_blob_prefix) + size_secret); key_blob.assign((const unsigned char*)&prefix, (const unsigned char*)(&prefix + 1)); key_blob.insert(key_blob.end(), (const unsigned char*)secret, (const unsigned char*)secret + size_secret); // Import the key. winstd::crypt_key key_out; if (!key_out.import(m_cp_enc, key_blob.data(), (DWORD)key_blob.size(), NULL, 0)) throw winstd::win_runtime_error(__FUNCTION__ " Error importing key."); return key_out.detach(); #else // Get private key's algorithm. ALG_ID alg_key; if (!CryptGetKeyParam(key, KP_ALGID, alg_key, 0)) throw win_runtime_error(__FUNCTION__ " Error getting key's algorithm.'"); // Get private key's length in bytes. DWORD size_key = CryptGetKeyParam(key, KP_KEYLEN, size_key, 0) ? size_key/8 : 0; // SIMPLEBLOB Format is documented in SDK // Copy header to buffer #pragma pack(push) #pragma pack(1) struct key_blob_prefix { PUBLICKEYSTRUC header; ALG_ID alg; } const prefix = { { SIMPLEBLOB, CUR_BLOB_VERSION, 0, alg, }, alg_key, }; #pragma pack(pop) sanitizing_blob key_blob; key_blob.reserve(sizeof(key_blob_prefix) + size_key); key_blob.assign((const unsigned char*)&prefix, (const unsigned char*)(&prefix + 1)); // Key in EME-PKCS1-v1_5 (RFC 3447). key_blob.push_back(0); // Initial zero key_blob.push_back(2); // PKCS #1 block type = 2 // PS size_t size_ps = size_key - size_secret - 3; assert(size_ps >= 8); #if 1 key_blob.insert(key_blob.end(), size_ps, 1); #else // Is random PS required at all? We are importing a clear-text session key with the exponent-of-one key. How low on security can we get? key_blob.insert(key_blob.end(), size_ps, 0); unsigned char *ps = &*(key_blob.end() - size_ps); CryptGenRandom(m_cp_enc, (DWORD)size_ps, ps); for (size_t i = 0; i < size_ps; i++) if (ps[i] == 0) ps[i] = 1; #endif key_blob.push_back(0); // PS and M zero delimiter // M key_blob.insert(key_blob.end(), (const unsigned char*)secret, (const unsigned char*)secret + size_secret); #ifdef _HOST_LOW_ENDIAN std::reverse(key_blob.end() - size_key, key_blob.end()); #endif // Import the key. winstd::crypt_key key_out; if (!key_out.import(m_cp_enc, key_blob.data(), (DWORD)key_blob.size(), key, 0)) throw winstd::win_runtime_error(__FUNCTION__ " Error importing key."); return key_out.detach(); #endif }