Porting SecureSocket to use BoringSSL on OSX

runtime/bin/secure_socket_boringssl.h

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_
-#define RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_
-
-#if !defined(RUNTIME_BIN_SECURE_SOCKET_H_)
-#error Do not include secure_socket_boringssl.h directly. Use secure_socket.h.
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-
-#include <openssl/bio.h>
-#include <openssl/err.h>
-#include <openssl/ssl.h>
-#include <openssl/x509.h>
-
-#include "bin/builtin.h"
-#include "bin/dartutils.h"
-#include "bin/reference_counting.h"
-#include "bin/socket.h"
-#include "bin/thread.h"
-#include "bin/utils.h"
-
-namespace dart {
-namespace bin {
-
-/* These are defined in root_certificates.cc. */
-extern const unsigned char* root_certificates_pem;
-extern unsigned int root_certificates_pem_length;
-
-class SSLContext {
- public:
-  static const intptr_t kApproximateSize;
-
-  explicit SSLContext(SSL_CTX* context)
-      : context_(context), alpn_protocol_string_(NULL) {}
-
-  ~SSLContext() {
-    SSL_CTX_free(context_);
-    if (alpn_protocol_string_ != NULL) {
-      free(alpn_protocol_string_);
-    }
-  }
-
-  SSL_CTX* context() const { return context_; }
-
-  uint8_t* alpn_protocol_string() const { return alpn_protocol_string_; }
-  void set_alpn_protocol_string(uint8_t* protocol_string) {
-    if (alpn_protocol_string_ != NULL) {
-      free(alpn_protocol_string_);
-    }
-    alpn_protocol_string_ = protocol_string;
-  }
-
- private:
-  SSL_CTX* context_;
-  uint8_t* alpn_protocol_string_;
-
-  DISALLOW_COPY_AND_ASSIGN(SSLContext);
-};
-
-/*
- * SSLFilter encapsulates the SSL(TLS) code in a filter, that communicates
- * with the containing _SecureFilterImpl Dart object through four shared
- * ExternalByteArray buffers, for reading and writing plaintext, and
- * reading and writing encrypted text.  The filter handles handshaking
- * and certificate verification.
- */
-class SSLFilter : public ReferenceCounted<SSLFilter> {
- public:
-  // These enums must agree with those in sdk/lib/io/secure_socket.dart.
-  enum BufferIndex {
-    kReadPlaintext,
-    kWritePlaintext,
-    kReadEncrypted,
-    kWriteEncrypted,
-    kNumBuffers,
-    kFirstEncrypted = kReadEncrypted
-  };
-
-  static const intptr_t kApproximateSize;
-
-  SSLFilter()
-      : callback_error(NULL),
-        ssl_(NULL),
-        socket_side_(NULL),
-        string_start_(NULL),
-        string_length_(NULL),
-        handshake_complete_(NULL),
-        bad_certificate_callback_(NULL),
-        in_handshake_(false),
-        hostname_(NULL) {}
-
-  ~SSLFilter();
-
-  Dart_Handle Init(Dart_Handle dart_this);
-  void Connect(const char* hostname,
-               SSL_CTX* context,
-               bool is_server,
-               bool request_client_certificate,
-               bool require_client_certificate,
-               Dart_Handle protocols_handle);
-  void Destroy();
-  void FreeResources();
-  void Handshake();
-  void GetSelectedProtocol(Dart_NativeArguments args);
-  void Renegotiate(bool use_session_cache,
-                   bool request_client_certificate,
-                   bool require_client_certificate);
-  void RegisterHandshakeCompleteCallback(Dart_Handle handshake_complete);
-  void RegisterBadCertificateCallback(Dart_Handle callback);
-  Dart_Handle bad_certificate_callback() {
-    return Dart_HandleFromPersistent(bad_certificate_callback_);
-  }
-  int ProcessReadPlaintextBuffer(int start, int end);
-  int ProcessWritePlaintextBuffer(int start, int end);
-  int ProcessReadEncryptedBuffer(int start, int end);
-  int ProcessWriteEncryptedBuffer(int start, int end);
-  bool ProcessAllBuffers(int starts[kNumBuffers],
-                         int ends[kNumBuffers],
-                         bool in_handshake);
-  Dart_Handle PeerCertificate();
-  static void InitializeLibrary();
-  Dart_Handle callback_error;
-
-  static CObject* ProcessFilterRequest(const CObjectArray& request);
-
-  // The index of the external data field in _ssl that points to the SSLFilter.
-  static int filter_ssl_index;
-
-  // TODO(whesse): make private:
-  SSL* ssl_;
-  BIO* socket_side_;
-
- private:
-  static const intptr_t kInternalBIOSize;
-  static bool library_initialized_;
-  static Mutex* mutex_;  // To protect library initialization.
-
-  uint8_t* buffers_[kNumBuffers];
-  int buffer_size_;
-  int encrypted_buffer_size_;
-  Dart_PersistentHandle string_start_;
-  Dart_PersistentHandle string_length_;
-  Dart_PersistentHandle dart_buffer_objects_[kNumBuffers];
-  Dart_PersistentHandle handshake_complete_;
-  Dart_PersistentHandle bad_certificate_callback_;
-  bool in_handshake_;
-  bool is_server_;
-  char* hostname_;
-
-  static bool isBufferEncrypted(int i) {
-    return static_cast<BufferIndex>(i) >= kFirstEncrypted;
-  }
-  Dart_Handle InitializeBuffers(Dart_Handle dart_this);
-  void InitializePlatformData();
-
-  DISALLOW_COPY_AND_ASSIGN(SSLFilter);
-};
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_