[io/ssl/mac] Retain certificates used by trust certification evaluation.

This is follow-up to https://dart-review.googlesource.com/c/sdk/+/174340, which moved construction of macos certificate list from boringssl structures from worker thread back to main thread, however it seems to have resulted in certificates in certificate list being prematurely released.
This cl explicitly passes/retains certificates lists to worker thread to be released after certificate trust is evaluated.

Avoid using deprecated SecTrustEvaluate if running on recent versions of OS.

Fixes flutter/flutter#73971

TEST=flutter/examples/image_list on mac osx 10.13.6 simulator 10.3.1

Change-Id: I36829a9b236fab2bbbe952314ce277c436ea0e10
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/183620
Commit-Queue: Alexander Aprelev <[email protected]>
Reviewed-by: Siva Annamalai <[email protected]>

runtime/bin/security_context_macos.cc

@@ -79,6 +79,8 @@ typedef ScopedCFType<SecPolicyRef> ScopedSecPolicyRef;
 typedef ScopedCFType<SecCertificateRef> ScopedSecCertificateRef;
 typedef ScopedCFType<SecTrustRef> ScopedSecTrustRef;
 
+const int kNumTrustEvaluateRequestParams = 5;
+
 static SecCertificateRef CreateSecCertificateFromX509(X509* cert) {
   if (cert == NULL) {
     return NULL;
@@ -206,11 +208,21 @@ static ssl_verify_result_t CertificateVerificationCallback(SSL* ssl,
     return ssl_verify_invalid;
   }
 
-  // Handler should release trust and root_cert.
+  // TrustEvaluateHandler should release all handles.
   Dart_CObject dart_cobject_trust;
   dart_cobject_trust.type = Dart_CObject_kInt64;
   dart_cobject_trust.value.as_int64 =
-      reinterpret_cast<intptr_t>(CFRetain(trust.get()));
+      reinterpret_cast<intptr_t>(trust.release());
+
+  Dart_CObject dart_cobject_cert_chain;
+  dart_cobject_cert_chain.type = Dart_CObject_kInt64;
+  dart_cobject_cert_chain.value.as_int64 =
+      reinterpret_cast<intptr_t>(cert_chain.release());
+
+  Dart_CObject dart_cobject_trusted_certs;
+  dart_cobject_trusted_certs.type = Dart_CObject_kInt64;
+  dart_cobject_trusted_certs.value.as_int64 =
+      reinterpret_cast<intptr_t>(trusted_certs.release());
 
   Dart_CObject dart_cobject_root_cert;
   dart_cobject_root_cert.type = Dart_CObject_kInt64;
@@ -222,9 +234,10 @@ static ssl_verify_result_t CertificateVerificationCallback(SSL* ssl,
 
   Dart_CObject array;
   array.type = Dart_CObject_kArray;
-  array.value.as_array.length = 3;
-  Dart_CObject* values[] = {&dart_cobject_trust, &dart_cobject_root_cert,
-                            &reply_send_port};
+  array.value.as_array.length = kNumTrustEvaluateRequestParams;
+  Dart_CObject* values[] = {&dart_cobject_trust, &dart_cobject_cert_chain,
+                            &dart_cobject_trusted_certs,
+                            &dart_cobject_root_cert, &reply_send_port};
   array.value.as_array.values = values;
 
   Dart_PostCObject(filter->trust_evaluate_reply_port(), &array);
@@ -265,36 +278,44 @@ static void TrustEvaluateHandler(Dart_Port dest_port_id,
   }
 
   CObjectArray request(message);
-  ASSERT(request.Length() == 3);
+  if (request.Length() != kNumTrustEvaluateRequestParams) {
+    FATAL2("Malformed trust evaluate message: got %" Pd
+           " parameters "
+           "expected %d\n",
+           request.Length(), kNumTrustEvaluateRequestParams);
+  }
   CObjectIntptr trust_cobject(request[0]);
   ScopedSecTrustRef trust(reinterpret_cast<SecTrustRef>(trust_cobject.Value()));
-  CObjectIntptr root_cert_cobject(request[1]);
+  CObjectIntptr cert_chain_cobject(request[1]);
+  ScopedCFMutableArrayRef cert_chain(
+      reinterpret_cast<CFMutableArrayRef>(cert_chain_cobject.Value()));
+  CObjectIntptr trusted_certs_cobject(request[2]);
+  ScopedCFMutableArrayRef trusted_certs(
+      reinterpret_cast<CFMutableArrayRef>(trusted_certs_cobject.Value()));
+  CObjectIntptr root_cert_cobject(request[3]);
   X509* root_cert = reinterpret_cast<X509*>(root_cert_cobject.Value());
-  CObjectSendPort reply_port(request[2]);
+  CObjectSendPort reply_port(request[4]);
   Dart_Port reply_port_id = reply_port.Value();
 
   SecTrustResultType trust_result;
   if (SSLCertContext::long_ssl_cert_evaluation()) {
     usleep(3000 * 1000 /* 3 s*/);
   }
 
+  OSStatus status = noErr;
   // Perform the certificate verification.
-#if ((defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && defined(__MAC_10_14_0) &&    \
-      __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_14_0) ||                     \
-     (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && defined(__IPHONE_12_0) &&   \
-      _IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_12_0))
-  // SecTrustEvaluateWithError available as of OSX 10.14 and iOS 12.
-  // The result is ignored as we get more information from the following call to
-  // SecTrustGetTrustResult which also happens to match the information we get
-  // from calling SecTrustEvaluate.
-  bool res = SecTrustEvaluateWithError(trust.get(), NULL);
-  USE(res);
-  OSStatus status = SecTrustGetTrustResult(trust.get(), &trust_result);
-#else
-
-  // SecTrustEvaluate is deprecated as of OSX 10.15 and iOS 13.
-  OSStatus status = SecTrustEvaluate(trust.get(), &trust_result);
-#endif
+  if (__builtin_available(iOS 12.0, macOS 10.14, *)) {
+    // SecTrustEvaluateWithError available as of OSX 10.14 and iOS 12.
+    // The result is ignored as we get more information from the following call
+    // to SecTrustGetTrustResult which also happens to match the information we
+    // get from calling SecTrustEvaluate.
+    bool res = SecTrustEvaluateWithError(trust.get(), NULL);
+    USE(res);
+    status = SecTrustGetTrustResult(trust.get(), &trust_result);
+  } else {
+    // SecTrustEvaluate is deprecated as of OSX 10.15 and iOS 13.
+    status = SecTrustEvaluate(trust.get(), &trust_result);
+  }
 
   postReply(reply_port_id,
             status == noErr && (trust_result == kSecTrustResultProceed ||