Porting SecureSocket to use BoringSSL on OSX

runtime/bin/secure_socket_utils.h

+// Copyright (c) 2017, 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_UTILS_H_
+#define RUNTIME_BIN_SECURE_SOCKET_UTILS_H_
+
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/pkcs12.h>
+#include <openssl/ssl.h>
+#include <openssl/x509.h>
+
+#include "platform/globals.h"
+
+#include "bin/dartutils.h"
+#include "platform/text_buffer.h"
+
+namespace dart {
+namespace bin {
+
+const bool SSL_LOG_STATUS = false;
+const bool SSL_LOG_DATA = false;
+const bool SSL_LOG_CERTS = false;
+
+class SecureSocketUtils : public AllStatic {
+ public:
+  static const int SSL_ERROR_MESSAGE_BUFFER_SIZE = 1000;
+
+  static void ThrowIOException(int status,
+                               const char* exception_type,
+                               const char* message,
+                               const SSL* ssl);
+
+  static void CheckStatusSSL(int status,
+                             const char* type,
+                             const char* message,
+                             const SSL* ssl);
+
+  static void CheckStatus(int status, const char* type, const char* message);
+
+  static bool NoPEMStartLine() {
+    uint32_t last_error = ERR_peek_last_error();
+    return (ERR_GET_LIB(last_error) == ERR_LIB_PEM) &&
+           (ERR_GET_REASON(last_error) == PEM_R_NO_START_LINE);
+  }
+
+  static void FetchErrorString(const SSL* ssl, TextBuffer* text_buffer);
+};
+
+
+// Where the argument to the constructor is the handle for an object
+// implementing List<int>, this class creates a scope in which a memory-backed
+// BIO is allocated. Leaving the scope cleans up the BIO and the buffer that
+// was used to create it.
+//
+// Do not make Dart_ API calls while in a ScopedMemBIO.
+// Do not call Dart_PropagateError while in a ScopedMemBIO.
+class ScopedMemBIO {
+ public:
+  explicit ScopedMemBIO(Dart_Handle object) {
+    if (!Dart_IsTypedData(object) && !Dart_IsList(object)) {
+      Dart_ThrowException(
+          DartUtils::NewDartArgumentError("Argument is not a List<int>"));
+    }
+
+    uint8_t* bytes = NULL;
+    intptr_t bytes_len = 0;
+    bool is_typed_data = false;
+    if (Dart_IsTypedData(object)) {
+      is_typed_data = true;
+      Dart_TypedData_Type typ;
+      ThrowIfError(Dart_TypedDataAcquireData(
+          object, &typ, reinterpret_cast<void**>(&bytes), &bytes_len));
+    } else {
+      ASSERT(Dart_IsList(object));
+      ThrowIfError(Dart_ListLength(object, &bytes_len));
+      bytes = Dart_ScopeAllocate(bytes_len);
+      ASSERT(bytes != NULL);
+      ThrowIfError(Dart_ListGetAsBytes(object, 0, bytes, bytes_len));
+    }
+
+    object_ = object;
+    bytes_ = bytes;
+    bytes_len_ = bytes_len;
+    bio_ = BIO_new_mem_buf(bytes, bytes_len);
+    ASSERT(bio_ != NULL);
+    is_typed_data_ = is_typed_data;
+  }
+
+  ~ScopedMemBIO() {
+    ASSERT(bio_ != NULL);
+    if (is_typed_data_) {
+      BIO_free(bio_);
+      ThrowIfError(Dart_TypedDataReleaseData(object_));
+    } else {
+      BIO_free(bio_);
+    }
+  }
+
+  BIO* bio() {
+    ASSERT(bio_ != NULL);
+    return bio_;
+  }
+
+ private:
+  Dart_Handle object_;
+  uint8_t* bytes_;
+  intptr_t bytes_len_;
+  BIO* bio_;
+  bool is_typed_data_;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(ScopedMemBIO);
+};
+
+template <typename T, void (*free_func)(T*)>
+class ScopedSSLType {
+ public:
+  explicit ScopedSSLType(T* obj) : obj_(obj) {}
+
+  ~ScopedSSLType() {
+    if (obj_ != NULL) {
+      free_func(obj_);
+    }
+  }
+
+  T* get() { return obj_; }
+  const T* get() const { return obj_; }
+
+  T* release() {
+    T* result = obj_;
+    obj_ = NULL;
+    return result;
+  }
+
+ private:
+  T* obj_;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(ScopedSSLType);
+};
+
+template <typename T, typename E, void (*func)(E*)>
+class ScopedSSLStackType {
+ public:
+  explicit ScopedSSLStackType(T* obj) : obj_(obj) {}
+
+  ~ScopedSSLStackType() {
+    if (obj_ != NULL) {
+      sk_pop_free(reinterpret_cast<_STACK*>(obj_),
+                  reinterpret_cast<void (*)(void*)>(func));
+    }
+  }
+
+  T* get() { return obj_; }
+  const T* get() const { return obj_; }
+
+  T* release() {
+    T* result = obj_;
+    obj_ = NULL;
+    return result;
+  }
+
+ private:
+  T* obj_;
+
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(ScopedSSLStackType);
+};
+
+
+typedef ScopedSSLType<PKCS12, PKCS12_free> ScopedPKCS12;
+typedef ScopedSSLType<X509, X509_free> ScopedX509;
+typedef ScopedSSLStackType<STACK_OF(X509), X509, X509_free> ScopedX509Stack;
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // RUNTIME_BIN_SECURE_SOCKET_UTILS_H_