diff --git a/ixwebsocket/IXSocketOpenSSL.cpp b/ixwebsocket/IXSocketOpenSSL.cpp index 12c95676..1f5c981b 100644 --- a/ixwebsocket/IXSocketOpenSSL.cpp +++ b/ixwebsocket/IXSocketOpenSSL.cpp @@ -16,17 +16,23 @@ #include #ifdef _WIN32 #include +//To avoid the problem with X509_NAME collision between macro in wincrypt.h and x509v3.h +//It has to be undef before x509v3.h and after wincrypt.h +#undef X509_NAME #else #include #endif -#if OPENSSL_VERSION_NUMBER < 0x10100000L + #include -#endif + #define socketerrno errno #ifdef _WIN32 // For manipulating the certificate store #include +// To avoid the problem with X509_NAME collision between macro in wincrypt.h and x509v3.h +// It has to be undef before x509v3.h and after wincrypt.h +#undef X509_NAME #endif #ifdef _WIN32 @@ -77,6 +83,43 @@ namespace return true; } + + bool isValidIpAddress(const std::string& s) + { + std::vector v; + int n = s.size(); + int start = 0, end = 0; + while (end < n) + { + while (end < n && s[end] != '.') + { + ++end; + } + if (start == end) { + return false; + } + int val = 0; + for (int i = start; i < end; ++i) + { + if (s[i] < '0' || s[i] > '9') + { + return false; + } + val = val * 10 + (s[i] - '0'); + } + if (val < 0 || val > 255) { + return false; + } + v.push_back(val); + start = ++end; + } + if (v.size() != 4) + { + return false; + } + return true; + } + } // namespace #endif @@ -763,10 +806,25 @@ namespace ix // (The docs say that this should work from 1.0.2, and is the default from // 1.1.0, but it does not. To be on the safe side, the manual test // below is enabled for all versions prior to 1.1.0.) - if (!_tlsOptions.disable_hostname_validation) + if (isValidIpAddress(host)) { - X509_VERIFY_PARAM* param = SSL_get0_param(_ssl_connection); - X509_VERIFY_PARAM_set1_host(param, host.c_str(), host.size()); + // We are connecting to an IP address. let OpenSSL validate the + // IP address in SAN + X509_VERIFY_PARAM *param = SSL_get0_param(_ssl_connection); + X509_VERIFY_PARAM_set1_host(param, NULL, 0); + X509_VERIFY_PARAM_set1_ip_asc(param, host.c_str()); + } + else if (!_tlsOptions.disable_hostname_validation) + { + SSL_set1_host(_ssl_connection, host.c_str()); + // Both CN-ID and partial wildcards are deprecated + // Optionally, reject all wildcards via: + // X509_CHECK_FLAG_NO_WILDCARDS + // See X509_check_host(3). + // + SSL_set_hostflags(_ssl_connection, + X509_CHECK_FLAG_NEVER_CHECK_SUBJECT | + X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS); } #endif handshakeSuccessful = openSSLClientHandshake(host, errMsg, isCancellationRequested); diff --git a/ixwebsocket/IXSocketOpenSSL.cpp.bak b/ixwebsocket/IXSocketOpenSSL.cpp.bak new file mode 100644 index 00000000..b73be23b --- /dev/null +++ b/ixwebsocket/IXSocketOpenSSL.cpp.bak @@ -0,0 +1,919 @@ +/* + * IXSocketOpenSSL.cpp + * Author: Benjamin Sergeant, Matt DeBoer, Max Weisel + * Copyright (c) 2017-2020 Machine Zone, Inc. All rights reserved. + * + * Adapted from Satori SDK OpenSSL code. + */ +#ifdef IXWEBSOCKET_USE_OPEN_SSL + +#include "IXSocketOpenSSL.h" + +#include "IXSocketConnect.h" +#include "IXUniquePtr.h" +#include +#include +#include +#ifdef _WIN32 +#include +//To avoid the problem with X509_NAME collision between macro in wincrypt.h and x509v3.h +//It has to be undef before x509v3.h and after wincrypt.h +#undef X509_NAME +#else +#include +#endif + +#include + +#define socketerrno errno + +#ifdef _WIN32 +// For manipulating the certificate store +#include +// To avoid the problem with X509_NAME collision between macro in wincrypt.h and x509v3.h +// It has to be undef before x509v3.h and after wincrypt.h +#undef X509_NAME +#endif + +#ifdef _WIN32 +namespace +{ + bool loadWindowsSystemCertificates(SSL_CTX* ssl, std::string& errorMsg) + { + DWORD flags = CERT_STORE_READONLY_FLAG | CERT_STORE_OPEN_EXISTING_FLAG | + CERT_SYSTEM_STORE_CURRENT_USER; + HCERTSTORE systemStore = CertOpenStore(CERT_STORE_PROV_SYSTEM, 0, 0, flags, L"Root"); + + if (!systemStore) + { + errorMsg = "CertOpenStore failed with "; + errorMsg += std::to_string(GetLastError()); + return false; + } + + PCCERT_CONTEXT certificateIterator = NULL; + X509_STORE* opensslStore = SSL_CTX_get_cert_store(ssl); + + int certificateCount = 0; + while (certificateIterator = CertEnumCertificatesInStore(systemStore, certificateIterator)) + { + X509* x509 = d2i_X509(NULL, + (const unsigned char**) &certificateIterator->pbCertEncoded, + certificateIterator->cbCertEncoded); + + if (x509) + { + if (X509_STORE_add_cert(opensslStore, x509) == 1) + { + ++certificateCount; + } + + X509_free(x509); + } + } + + CertFreeCertificateContext(certificateIterator); + CertCloseStore(systemStore, 0); + + if (certificateCount == 0) + { + errorMsg = "No certificates found"; + return false; + } + + return true; + } + + bool isValidIpAddress(const std::string& s) + { + std::vector v; + int n = s.size(); + int start = 0, end = 0; + while (end < n) + { + while (end < n && s[end] != '.') + { + ++end; + } + if (start == end) { + return false; + } + int val = 0; + for (int i = start; i < end; ++i) + { + if (s[i] < '0' || s[i] > '9') + { + return false; + } + val = val * 10 + (s[i] - '0'); + } + if (val < 0 || val > 255) { + return false; + } + v.push_back(val); + start = ++end; + } + if (v.size() != 4) + { + return false; + } + return true; + } + +} // namespace +#endif + +namespace ix +{ + const std::string kDefaultCiphers = + "ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA " + "ECDHE-ECDSA-AES256-SHA ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES256-SHA384 " + "ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA " + "ECDHE-RSA-AES256-SHA ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 " + "DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-SHA " + "DHE-RSA-AES256-SHA DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256 AES128-SHA"; + + std::atomic SocketOpenSSL::_openSSLInitializationSuccessful(false); + std::once_flag SocketOpenSSL::_openSSLInitFlag; + std::vector> openSSLMutexes; + + SocketOpenSSL::SocketOpenSSL(const SocketTLSOptions& tlsOptions, int fd) + : Socket(fd) + , _ssl_connection(nullptr) + , _ssl_context(nullptr) + , _tlsOptions(tlsOptions) + { + std::call_once(_openSSLInitFlag, &SocketOpenSSL::openSSLInitialize, this); + } + + SocketOpenSSL::~SocketOpenSSL() + { + SocketOpenSSL::close(); + } + + void SocketOpenSSL::openSSLInitialize() + { +#if OPENSSL_VERSION_NUMBER >= 0x10100000L + if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_CONFIG, nullptr)) return; +#else + (void) OPENSSL_config(nullptr); + + if (CRYPTO_get_locking_callback() == nullptr) + { + openSSLMutexes.clear(); + for (int i = 0; i < CRYPTO_num_locks(); ++i) + { + openSSLMutexes.push_back(ix::make_unique()); + } + CRYPTO_set_locking_callback(SocketOpenSSL::openSSLLockingCallback); + } +#endif + + (void) OpenSSL_add_ssl_algorithms(); + (void) SSL_load_error_strings(); + + _openSSLInitializationSuccessful = true; + } + + void SocketOpenSSL::openSSLLockingCallback(int mode, + int type, + const char* /*file*/, + int /*line*/) + { + if (mode & CRYPTO_LOCK) + { + openSSLMutexes[type]->lock(); + } + else + { + openSSLMutexes[type]->unlock(); + } + } + + std::string SocketOpenSSL::getSSLError(int ret) + { + unsigned long e; + + int err = SSL_get_error(_ssl_connection, ret); + + if (err == SSL_ERROR_WANT_CONNECT || err == SSL_ERROR_WANT_ACCEPT) + { + return "OpenSSL failed - connection failure"; + } + else if (err == SSL_ERROR_WANT_X509_LOOKUP) + { + return "OpenSSL failed - x509 error"; + } + else if (err == SSL_ERROR_SYSCALL) + { + e = ERR_get_error(); + if (e > 0) + { + std::string errMsg("OpenSSL failed - "); + errMsg += ERR_error_string(e, nullptr); + return errMsg; + } + else if (e == 0 && ret == 0) + { + return "OpenSSL failed - received early EOF"; + } + else + { + return "OpenSSL failed - underlying BIO reported an I/O error"; + } + } + else if (err == SSL_ERROR_SSL) + { + e = ERR_get_error(); + std::string errMsg("OpenSSL failed - "); + errMsg += ERR_error_string(e, nullptr); + return errMsg; + } + else if (err == SSL_ERROR_NONE) + { + return "OpenSSL failed - err none"; + } + else if (err == SSL_ERROR_ZERO_RETURN) + { + return "OpenSSL failed - err zero return"; + } + else + { + return "OpenSSL failed - unknown error"; + } + } + + SSL_CTX* SocketOpenSSL::openSSLCreateContext(std::string& errMsg) + { + const SSL_METHOD* method = SSLv23_client_method(); + if (method == nullptr) + { + errMsg = "SSLv23_client_method failure"; + return nullptr; + } + _ssl_method = method; + + SSL_CTX* ctx = SSL_CTX_new(_ssl_method); + if (ctx) + { + SSL_CTX_set_mode(ctx, + SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); + + int options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_CIPHER_SERVER_PREFERENCE; + +#ifdef SSL_OP_NO_TLSv1_3 + // (partially?) work around hang in openssl 1.1.1b, by disabling TLS V1.3 + // https://github.com/openssl/openssl/issues/7967 + options |= SSL_OP_NO_TLSv1_3; +#endif + SSL_CTX_set_options(ctx, options); + } + return ctx; + } + + bool SocketOpenSSL::openSSLAddCARootsFromString(const std::string roots) + { + // Create certificate store + X509_STORE* certificate_store = SSL_CTX_get_cert_store(_ssl_context); + if (certificate_store == nullptr) return false; + + // Configure to allow intermediate certs + X509_STORE_set_flags(certificate_store, + X509_V_FLAG_TRUSTED_FIRST | X509_V_FLAG_PARTIAL_CHAIN); + + // Create a new buffer and populate it with the roots + BIO* buffer = BIO_new_mem_buf((void*) roots.c_str(), static_cast(roots.length())); + if (buffer == nullptr) return false; + + // Read each root in the buffer and add to the certificate store + bool success = true; + size_t number_of_roots = 0; + + while (true) + { + // Read the next root in the buffer + X509* root = PEM_read_bio_X509_AUX(buffer, nullptr, nullptr, (void*) ""); + if (root == nullptr) + { + // No more certs left in the buffer, we're done. + ERR_clear_error(); + break; + } + + // Try adding the root to the certificate store + ERR_clear_error(); + if (!X509_STORE_add_cert(certificate_store, root)) + { + // Failed to add. If the error is unrelated to the x509 lib or the cert already + // exists, we're safe to continue. + unsigned long error = ERR_get_error(); + if (ERR_GET_LIB(error) != ERR_LIB_X509 || + ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) + { + // Failed. Clean up and bail. + success = false; + X509_free(root); + break; + } + } + + // Clean up and loop + X509_free(root); + number_of_roots++; + } + + // Clean up buffer + BIO_free(buffer); + + // Make sure we loaded at least one certificate. + if (number_of_roots == 0) success = false; + + return success; + } + + /** + * Check whether a hostname matches a pattern + */ + bool SocketOpenSSL::checkHost(const std::string& host, const char* pattern) + { +#ifdef _WIN32 + return PathMatchSpecA(host.c_str(), pattern); +#else + return fnmatch(pattern, host.c_str(), 0) != FNM_NOMATCH; +#endif + } + + bool SocketOpenSSL::openSSLCheckServerCert(SSL* ssl, +#if OPENSSL_VERSION_NUMBER < 0x10100000L + const std::string& hostname, +#else + const std::string& /* hostname */, +#endif + std::string& errMsg) + { + X509* server_cert = SSL_get_peer_certificate(ssl); + if (server_cert == nullptr) + { + errMsg = "OpenSSL failed - peer didn't present a X509 certificate."; + return false; + } + +#if OPENSSL_VERSION_NUMBER < 0x10100000L + // Check server name + bool hostname_verifies_ok = false; + STACK_OF(GENERAL_NAME)* san_names = (STACK_OF(GENERAL_NAME)*) X509_get_ext_d2i( + (X509*) server_cert, NID_subject_alt_name, NULL, NULL); + if (san_names) + { + for (int i = 0; i < sk_GENERAL_NAME_num(san_names); i++) + { + const GENERAL_NAME* sk_name = sk_GENERAL_NAME_value(san_names, i); + if (sk_name->type == GEN_DNS) + { + char* name = (char*) ASN1_STRING_data(sk_name->d.dNSName); + if ((size_t) ASN1_STRING_length(sk_name->d.dNSName) == strlen(name) && + checkHost(hostname, name)) + { + hostname_verifies_ok = true; + break; + } + } + } + } + sk_GENERAL_NAME_pop_free(san_names, GENERAL_NAME_free); + + if (!hostname_verifies_ok) + { + int cn_pos = X509_NAME_get_index_by_NID( + X509_get_subject_name((X509*) server_cert), NID_commonName, -1); + if (cn_pos >= 0) + { + X509_NAME_ENTRY* cn_entry = + X509_NAME_get_entry(X509_get_subject_name((X509*) server_cert), cn_pos); + + if (cn_entry != nullptr) + { + ASN1_STRING* cn_asn1 = X509_NAME_ENTRY_get_data(cn_entry); + char* cn = (char*) ASN1_STRING_data(cn_asn1); + + if ((size_t) ASN1_STRING_length(cn_asn1) == strlen(cn) && + checkHost(hostname, cn)) + { + hostname_verifies_ok = true; + } + } + } + } + + if (!hostname_verifies_ok) + { + errMsg = "OpenSSL failed - certificate was issued for a different domain."; + return false; + } +#endif + + X509_free(server_cert); + return true; + } + + bool SocketOpenSSL::openSSLClientHandshake(const std::string& host, + std::string& errMsg, + const CancellationRequest& isCancellationRequested) + { + while (true) + { + if (_ssl_connection == nullptr || _ssl_context == nullptr) + { + return false; + } + + if (isCancellationRequested()) + { + errMsg = "Cancellation requested"; + return false; + } + + ERR_clear_error(); + int connect_result = SSL_connect(_ssl_connection); + if (connect_result == 1) + { + if (_tlsOptions.disable_hostname_validation) + { + return true; + } + + return openSSLCheckServerCert(_ssl_connection, host, errMsg); + } + int reason = SSL_get_error(_ssl_connection, connect_result); + + bool rc = false; + if (reason == SSL_ERROR_WANT_READ || reason == SSL_ERROR_WANT_WRITE) + { + rc = true; + } + else + { + errMsg = getSSLError(connect_result); + rc = false; + } + + if (!rc) + { + return false; + } + } + } + + bool SocketOpenSSL::openSSLServerHandshake(std::string& errMsg) + { + while (true) + { + if (_ssl_connection == nullptr || _ssl_context == nullptr) + { + return false; + } + + ERR_clear_error(); + int accept_result = SSL_accept(_ssl_connection); + if (accept_result == 1) + { + return true; + } + int reason = SSL_get_error(_ssl_connection, accept_result); + + bool rc = false; + if (reason == SSL_ERROR_WANT_READ || reason == SSL_ERROR_WANT_WRITE) + { + rc = true; + } + else + { + errMsg = getSSLError(accept_result); + rc = false; + } + + if (!rc) + { + return false; + } + } + } + + bool SocketOpenSSL::handleTLSOptions(std::string& errMsg) + { + ERR_clear_error(); + if (_tlsOptions.hasCertAndKey()) + { + if (SSL_CTX_use_certificate_chain_file(_ssl_context, _tlsOptions.certFile.c_str()) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_use_certificate_chain_file(\"" + + _tlsOptions.certFile + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + else if (SSL_CTX_use_PrivateKey_file( + _ssl_context, _tlsOptions.keyFile.c_str(), SSL_FILETYPE_PEM) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_use_PrivateKey_file(\"" + _tlsOptions.keyFile + + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + else if (!SSL_CTX_check_private_key(_ssl_context)) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - cert/key mismatch(\"" + _tlsOptions.certFile + ", " + + _tlsOptions.keyFile + "\")"; + errMsg += ERR_error_string(sslErr, nullptr); + } + } + + ERR_clear_error(); + if (!_tlsOptions.isPeerVerifyDisabled()) + { + if (_tlsOptions.isUsingSystemDefaults()) + { +#ifdef _WIN32 + if (!loadWindowsSystemCertificates(_ssl_context, errMsg)) + { + return false; + } +#else + if (SSL_CTX_set_default_verify_paths(_ssl_context) == 0) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_default_verify_paths loading failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + return false; + } +#endif + } + else + { + if (_tlsOptions.isUsingInMemoryCAs()) + { + // Load from memory + openSSLAddCARootsFromString(_tlsOptions.caFile); + } + else + { + if (SSL_CTX_load_verify_locations( + _ssl_context, _tlsOptions.caFile.c_str(), NULL) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_load_verify_locations(\"" + + _tlsOptions.caFile + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + return false; + } + } + } + + SSL_CTX_set_verify(_ssl_context, + SSL_VERIFY_PEER, + [](int preverify, X509_STORE_CTX*) -> int { return preverify; }); + SSL_CTX_set_verify_depth(_ssl_context, 4); + } + else + { + SSL_CTX_set_verify(_ssl_context, SSL_VERIFY_NONE, nullptr); + } + + if (_tlsOptions.isUsingDefaultCiphers()) + { + if (SSL_CTX_set_cipher_list(_ssl_context, kDefaultCiphers.c_str()) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_set_cipher_list(\"" + kDefaultCiphers + + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + return false; + } + } + else if (SSL_CTX_set_cipher_list(_ssl_context, _tlsOptions.ciphers.c_str()) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_set_cipher_list(\"" + _tlsOptions.ciphers + + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + return false; + } + + return true; + } + + bool SocketOpenSSL::accept(std::string& errMsg) + { + bool handshakeSuccessful = false; + { + std::lock_guard lock(_mutex); + + if (!_openSSLInitializationSuccessful) + { + errMsg = "OPENSSL_init_ssl failure"; + return false; + } + + if (_sockfd == -1) + { + return false; + } + + { + const SSL_METHOD* method = SSLv23_server_method(); + if (method == nullptr) + { + errMsg = "SSLv23_server_method failure"; + _ssl_context = nullptr; + } + else + { + _ssl_method = method; + + _ssl_context = SSL_CTX_new(_ssl_method); + if (_ssl_context) + { + SSL_CTX_set_mode(_ssl_context, SSL_MODE_ENABLE_PARTIAL_WRITE); + SSL_CTX_set_mode(_ssl_context, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); + SSL_CTX_set_options(_ssl_context, + SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3); + } + } + } + + if (_ssl_context == nullptr) + { + return false; + } + + ERR_clear_error(); + if (_tlsOptions.hasCertAndKey()) + { + if (SSL_CTX_use_certificate_chain_file(_ssl_context, + _tlsOptions.certFile.c_str()) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_use_certificate_chain_file(\"" + + _tlsOptions.certFile + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + else if (SSL_CTX_use_PrivateKey_file( + _ssl_context, _tlsOptions.keyFile.c_str(), SSL_FILETYPE_PEM) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_use_PrivateKey_file(\"" + + _tlsOptions.keyFile + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + } + + + ERR_clear_error(); + if (!_tlsOptions.isPeerVerifyDisabled()) + { + if (_tlsOptions.isUsingSystemDefaults()) + { + if (SSL_CTX_set_default_verify_paths(_ssl_context) == 0) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_default_verify_paths loading failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + } + else + { + if (_tlsOptions.isUsingInMemoryCAs()) + { + // Load from memory + openSSLAddCARootsFromString(_tlsOptions.caFile); + } + else + { + const char* root_ca_file = _tlsOptions.caFile.c_str(); + STACK_OF(X509_NAME) * rootCAs; + rootCAs = SSL_load_client_CA_file(root_ca_file); + if (rootCAs == NULL) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_load_client_CA_file('" + + _tlsOptions.caFile + "') failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + else + { + SSL_CTX_set_client_CA_list(_ssl_context, rootCAs); + if (SSL_CTX_load_verify_locations( + _ssl_context, root_ca_file, nullptr) != 1) + { + auto sslErr = ERR_get_error(); + errMsg = "OpenSSL failed - SSL_CTX_load_verify_locations(\"" + + _tlsOptions.caFile + "\") failed: "; + errMsg += ERR_error_string(sslErr, nullptr); + } + } + } + } + + SSL_CTX_set_verify( + _ssl_context, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nullptr); + SSL_CTX_set_verify_depth(_ssl_context, 4); + } + else + { + SSL_CTX_set_verify(_ssl_context, SSL_VERIFY_NONE, nullptr); + } + if (_tlsOptions.isUsingDefaultCiphers()) + { + if (SSL_CTX_set_cipher_list(_ssl_context, kDefaultCiphers.c_str()) != 1) + { + return false; + } + } + else if (SSL_CTX_set_cipher_list(_ssl_context, _tlsOptions.ciphers.c_str()) != 1) + { + return false; + } + + _ssl_connection = SSL_new(_ssl_context); + if (_ssl_connection == nullptr) + { + errMsg = "OpenSSL failed to connect"; + SSL_CTX_free(_ssl_context); + _ssl_context = nullptr; + return false; + } + + SSL_set_ecdh_auto(_ssl_connection, 1); + + SSL_set_fd(_ssl_connection, _sockfd); + + handshakeSuccessful = openSSLServerHandshake(errMsg); + } + + if (!handshakeSuccessful) + { + close(); + return false; + } + + return true; + } + + bool SocketOpenSSL::connect(const std::string& host, + int port, + std::string& errMsg, + const CancellationRequest& isCancellationRequested) + { + bool handshakeSuccessful = false; + { + std::lock_guard lock(_mutex); + + if (!_openSSLInitializationSuccessful) + { + errMsg = "OPENSSL_init_ssl failure"; + return false; + } + + _sockfd = SocketConnect::connect(host, port, errMsg, isCancellationRequested); + if (_sockfd == -1) return false; + + _ssl_context = openSSLCreateContext(errMsg); + if (_ssl_context == nullptr) + { + return false; + } + + if (!handleTLSOptions(errMsg)) + { + return false; + } + + _ssl_connection = SSL_new(_ssl_context); + if (_ssl_connection == nullptr) + { + errMsg = "OpenSSL failed to connect"; + SSL_CTX_free(_ssl_context); + _ssl_context = nullptr; + return false; + } + SSL_set_fd(_ssl_connection, _sockfd); + + // SNI support + SSL_set_tlsext_host_name(_ssl_connection, host.c_str()); + +#if OPENSSL_VERSION_NUMBER >= 0x10002000L + // Support for server name verification + // (The docs say that this should work from 1.0.2, and is the default from + // 1.1.0, but it does not. To be on the safe side, the manual test + // below is enabled for all versions prior to 1.1.0.) + if (isValidIpAddress(host)) + { + // We are connecting to an IP address. let OpenSSL validate the + // IP address in SAN + X509_VERIFY_PARAM *param = SSL_get0_param(_ssl_connection); + X509_VERIFY_PARAM_set1_host(param, NULL, 0); + X509_VERIFY_PARAM_set1_ip_asc(param, host.c_str()); + } + else + { + SSL_set1_host(_ssl_connection, host.c_str()); + // Both CN-ID and partial wildcards are deprecated + // Optionally, reject all wildcards via: + // X509_CHECK_FLAG_NO_WILDCARDS + // See X509_check_host(3). + // + SSL_set_hostflags(_ssl_connection, + X509_CHECK_FLAG_NEVER_CHECK_SUBJECT | + X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS); + } +#endif + handshakeSuccessful = openSSLClientHandshake(host, errMsg, isCancellationRequested); + } + + if (!handshakeSuccessful) + { + close(); + return false; + } + + return true; + } + + void SocketOpenSSL::close() + { + std::lock_guard lock(_mutex); + + if (_ssl_connection != nullptr) + { + SSL_free(_ssl_connection); + _ssl_connection = nullptr; + } + if (_ssl_context != nullptr) + { + SSL_CTX_free(_ssl_context); + _ssl_context = nullptr; + } + + Socket::close(); + } + + ssize_t SocketOpenSSL::send(char* buf, size_t nbyte) + { + std::lock_guard lock(_mutex); + + if (_ssl_connection == nullptr || _ssl_context == nullptr) + { + return 0; + } + + ERR_clear_error(); + ssize_t write_result = SSL_write(_ssl_connection, buf, (int) nbyte); + int reason = SSL_get_error(_ssl_connection, (int) write_result); + + if (reason == SSL_ERROR_NONE) + { + return write_result; + } + else if (reason == SSL_ERROR_WANT_READ || reason == SSL_ERROR_WANT_WRITE) + { + errno = EWOULDBLOCK; + return -1; + } + else + { + return -1; + } + } + + ssize_t SocketOpenSSL::recv(void* buf, size_t nbyte) + { + while (true) + { + std::lock_guard lock(_mutex); + + if (_ssl_connection == nullptr || _ssl_context == nullptr) + { + return 0; + } + + ERR_clear_error(); + ssize_t read_result = SSL_read(_ssl_connection, buf, (int) nbyte); + + if (read_result > 0) + { + return read_result; + } + + int reason = SSL_get_error(_ssl_connection, (int) read_result); + + if (reason == SSL_ERROR_WANT_READ || reason == SSL_ERROR_WANT_WRITE) + { + errno = EWOULDBLOCK; + } + return -1; + } + } + +} // namespace ix + +#endif // IXWEBSOCKET_USE_OPEN_SSL