mirror of https://github.com/yuzu-emu/yuzu.git
...actually add the SecureTransport backend to Git.
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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "core/hle/service/ssl/ssl_backend.h"
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#include "core/internal_network/network.h"
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#include "core/internal_network/sockets.h"
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#include <mutex>
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#include <Security/SecureTransport.h>
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// SecureTransport has been deprecated in its entirety in favor of
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// Network.framework, but that does not allow layering TLS on top of an
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// arbitrary socket.
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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namespace {
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template <typename T>
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struct CFReleaser {
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T ptr;
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YUZU_NON_COPYABLE(CFReleaser);
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constexpr CFReleaser() : ptr(nullptr) {}
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constexpr CFReleaser(T ptr) : ptr(ptr) {}
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constexpr operator T() {
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return ptr;
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}
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~CFReleaser() {
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if (ptr) {
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CFRelease(ptr);
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}
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}
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};
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std::string CFStringToString(CFStringRef cfstr) {
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CFReleaser<CFDataRef> cfdata(
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CFStringCreateExternalRepresentation(nullptr, cfstr, kCFStringEncodingUTF8, 0));
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ASSERT_OR_EXECUTE(cfdata, { return "???"; });
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return std::string(reinterpret_cast<const char*>(CFDataGetBytePtr(cfdata)),
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CFDataGetLength(cfdata));
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}
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std::string OSStatusToString(OSStatus status) {
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CFReleaser<CFStringRef> cfstr(SecCopyErrorMessageString(status, nullptr));
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if (!cfstr) {
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return "[unknown error]";
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}
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return CFStringToString(cfstr);
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}
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} // namespace
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namespace Service::SSL {
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class SSLConnectionBackendSecureTransport final : public SSLConnectionBackend {
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public:
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Result Init() {
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static std::once_flag once_flag;
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std::call_once(once_flag, []() {
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if (getenv("SSLKEYLOGFILE")) {
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LOG_CRITICAL(Service_SSL, "SSLKEYLOGFILE was set but SecureTransport does not "
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"support exporting keys; not logging keys!");
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// Not fatal.
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}
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});
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context.ptr = SSLCreateContext(nullptr, kSSLClientSide, kSSLStreamType);
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if (!context) {
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LOG_ERROR(Service_SSL, "SSLCreateContext failed");
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return ResultInternalError;
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}
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OSStatus status;
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if ((status = SSLSetIOFuncs(context, ReadCallback, WriteCallback)) ||
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(status = SSLSetConnection(context, this))) {
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LOG_ERROR(Service_SSL, "SSLContext initialization failed: {}",
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OSStatusToString(status));
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return ResultInternalError;
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}
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return ResultSuccess;
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}
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void SetSocket(std::shared_ptr<Network::SocketBase> in_socket) override {
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socket = std::move(in_socket);
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}
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Result SetHostName(const std::string& hostname) override {
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OSStatus status = SSLSetPeerDomainName(context, hostname.c_str(), hostname.size());
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if (status) {
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LOG_ERROR(Service_SSL, "SSLSetPeerDomainName failed: {}", OSStatusToString(status));
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return ResultInternalError;
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}
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return ResultSuccess;
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}
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Result DoHandshake() override {
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OSStatus status = SSLHandshake(context);
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return HandleReturn("SSLHandshake", 0, status).Code();
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}
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ResultVal<size_t> Read(std::span<u8> data) override {
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size_t actual;
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OSStatus status = SSLRead(context, data.data(), data.size(), &actual);
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;
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return HandleReturn("SSLRead", actual, status);
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}
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ResultVal<size_t> Write(std::span<const u8> data) override {
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size_t actual;
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OSStatus status = SSLWrite(context, data.data(), data.size(), &actual);
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;
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return HandleReturn("SSLWrite", actual, status);
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}
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ResultVal<size_t> HandleReturn(const char* what, size_t actual, OSStatus status) {
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switch (status) {
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case 0:
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return actual;
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case errSSLWouldBlock:
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return ResultWouldBlock;
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default: {
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std::string reason;
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if (got_read_eof) {
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reason = "server hung up";
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} else {
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reason = OSStatusToString(status);
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}
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LOG_ERROR(Service_SSL, "{} failed: {}", what, reason);
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return ResultInternalError;
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}
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}
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}
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ResultVal<std::vector<std::vector<u8>>> GetServerCerts() override {
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CFReleaser<SecTrustRef> trust;
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OSStatus status = SSLCopyPeerTrust(context, &trust.ptr);
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if (status) {
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LOG_ERROR(Service_SSL, "SSLCopyPeerTrust failed: {}", OSStatusToString(status));
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return ResultInternalError;
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}
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std::vector<std::vector<u8>> ret;
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for (CFIndex i = 0, count = SecTrustGetCertificateCount(trust); i < count; i++) {
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SecCertificateRef cert = SecTrustGetCertificateAtIndex(trust, i);
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CFReleaser<CFDataRef> data(SecCertificateCopyData(cert));
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ASSERT_OR_EXECUTE(data, { return ResultInternalError; });
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const u8* ptr = CFDataGetBytePtr(data);
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ret.emplace_back(ptr, ptr + CFDataGetLength(data));
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}
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return ret;
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}
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static OSStatus ReadCallback(SSLConnectionRef connection, void* data, size_t* dataLength) {
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return ReadOrWriteCallback(connection, data, dataLength, true);
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}
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static OSStatus WriteCallback(SSLConnectionRef connection, const void* data,
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size_t* dataLength) {
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return ReadOrWriteCallback(connection, const_cast<void*>(data), dataLength, false);
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}
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static OSStatus ReadOrWriteCallback(SSLConnectionRef connection, void* data, size_t* dataLength,
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bool is_read) {
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auto self =
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static_cast<SSLConnectionBackendSecureTransport*>(const_cast<void*>(connection));
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ASSERT_OR_EXECUTE_MSG(
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self->socket, { return 0; }, "SecureTransport asked to {} but we have no socket",
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is_read ? "read" : "write");
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// SecureTransport callbacks (unlike OpenSSL BIO callbacks) are
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// expected to read/write the full requested dataLength or return an
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// error, so we have to add a loop ourselves.
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size_t requested_len = *dataLength;
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size_t offset = 0;
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while (offset < requested_len) {
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std::span cur(reinterpret_cast<u8*>(data) + offset, requested_len - offset);
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auto [actual, err] = is_read ? self->socket->Recv(0, cur) : self->socket->Send(cur, 0);
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LOG_CRITICAL(Service_SSL, "op={}, offset={} actual={}/{} err={}", is_read, offset,
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actual, cur.size(), static_cast<s32>(err));
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switch (err) {
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case Network::Errno::SUCCESS:
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offset += actual;
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if (actual == 0) {
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ASSERT(is_read);
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self->got_read_eof = true;
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return errSecEndOfData;
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}
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break;
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case Network::Errno::AGAIN:
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*dataLength = offset;
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return errSSLWouldBlock;
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default:
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LOG_ERROR(Service_SSL, "Socket {} returned Network::Errno {}",
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is_read ? "recv" : "send", err);
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return errSecIO;
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}
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}
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ASSERT(offset == requested_len);
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return 0;
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}
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private:
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CFReleaser<SSLContextRef> context = nullptr;
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bool got_read_eof = false;
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std::shared_ptr<Network::SocketBase> socket;
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};
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ResultVal<std::unique_ptr<SSLConnectionBackend>> CreateSSLConnectionBackend() {
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auto conn = std::make_unique<SSLConnectionBackendSecureTransport>();
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const Result res = conn->Init();
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if (res.IsFailure()) {
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return res;
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}
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return conn;
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}
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} // namespace Service::SSL
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