Porting SecureSocket to use BoringSSL on OSX

runtime/bin/security_context_android.cc

Index: runtime/bin/security_context_android.cc
diff --git a/runtime/bin/security_context_android.cc b/runtime/bin/security_context_android.cc
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+++ b/runtime/bin/security_context_android.cc
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+// 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.
+
+#if !defined(DART_IO_DISABLED) && !defined(DART_IO_SECURE_SOCKET_DISABLED)
+
+#include "platform/globals.h"
+#if defined(HOST_OS_ANDROID)
+
+#include "bin/security_context.h"
+
+#include <openssl/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/x509.h>
+
+#include "bin/directory.h"
+#include "bin/file.h"
+#include "bin/log.h"
+#include "bin/secure_socket_filter.h"
+#include "bin/secure_socket_utils.h"
+
+namespace dart {
+namespace bin {
+
+// The security context won't necessarily use the compiled-in root certificates,
+// but since there is no way to update the size of the allocation after creating
+// the weak persistent handle, we assume that it will. Note that when the
+// root certs aren't compiled in, |root_certificates_pem_length| is 0.
+const intptr_t SSLCertContext::kApproximateSize =
+    sizeof(SSLCertContext) + root_certificates_pem_length;
+
+const char* commandline_root_certs_file = NULL;
+const char* commandline_root_certs_cache = NULL;
+
+void SSLCertContext::TrustBuiltinRoots() {
+  // First, try to use locations specified on the command line.
+  if (commandline_root_certs_file != NULL) {
+    LoadRootCertFile(commandline_root_certs_file);
+    return;
+  }
+
+  if (commandline_root_certs_cache != NULL) {
+    LoadRootCertCache(commandline_root_certs_cache);
+    return;
+  }
+
+  // On Android, we don't compile in the trusted root certificates. Insead,
+  // we use the directory of trusted certificates already present on the device.
+  // This saves ~240KB from the size of the binary. This has the drawback that
+  // SSL_do_handshake will synchronously hit the filesystem looking for root
+  // certs during its trust evaluation. We call SSL_do_handshake directly from
+  // the Dart thread so that Dart code can be invoked from the "bad certificate"
+  // callback called by SSL_do_handshake.
+  const char* android_cacerts = "/system/etc/security/cacerts";
+  LoadRootCertCache(android_cacerts);
+  return;
+}
+
+
+void SSLCertContext::RegisterCallbacks(SSL* ssl) {
+  // No callbacks to register for implementations using BoringSSL's built-in
+  // verification mechanism.
+}
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // defined(HOST_OS_ANDROID)
+
+#endif  // !defined(DART_IO_DISABLED) &&
+        // !defined(DART_IO_SECURE_SOCKET_DISABLED)