HwangDongJun commented on code in PR #12831:
URL: https://github.com/apache/gluten/pull/12831#discussion_r4359549691


##########
cpp/velox/compute/VeloxBackend.cc:
##########
@@ -191,6 +192,9 @@ void VeloxBackend::init(
 
   hiveConnectorConfig_ = createHiveConnectorConfig(backendConf_);
 
+  // Make sure the statically linked OpenSSL can find trusted certificates 
before any filesystem creates an HTTP client.
+  ensureTlsTrustStore();

Review Comment:
   Copilot points out that `setenv` can race with other threads reading the 
environment. Not changed: the call is made once, early in `VeloxBackend::init`, 
before any filesystem is registered, and `NativeBackendInitializer` guards the 
init with `compareAndSet`, so it runs once per JVM. I cannot rule out other 
threads (JVM, Spark) reading the environment at that moment. The alternative, 
setting `caFile` on each client, would only cover S3, not GCS and ABFS, which 
use the same libcurl. This is a trade-off for the maintainers to decide.



##########
cpp/velox/utils/TlsTrustStore.cc:
##########
@@ -0,0 +1,126 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "utils/TlsTrustStore.h"
+
+#include <glog/logging.h>
+#include <cctype>
+#include <cstdlib>
+#include <filesystem>
+
+namespace gluten {
+
+namespace {
+
+namespace fs = std::filesystem;
+
+bool isRegularFile(const std::string& path) {
+  std::error_code ec;
+  return fs::is_regular_file(path, ec) && !ec;
+}
+
+// OpenSSL finds certificates in a directory only through files named <8 hex 
digits>.<digit>, created by
+// `openssl rehash`.
+bool isHashedCertificateName(const std::string& name) {
+  if (name.size() < 10 || name[8] != '.') {
+    return false;
+  }
+  for (size_t i = 0; i < 8; ++i) {
+    if (!std::isxdigit(static_cast<unsigned char>(name[i]))) {
+      return false;
+    }
+  }
+  for (size_t i = 9; i < name.size(); ++i) {
+    if (!std::isdigit(static_cast<unsigned char>(name[i]))) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool hasHashedCertificate(const std::string& dir) {
+  std::error_code ec;
+  fs::directory_iterator it(dir, 
fs::directory_options::skip_permission_denied, ec);
+  if (ec) {
+    return false;
+  }
+  for (const auto& entry : it) {
+    if (isHashedCertificateName(entry.path().filename().string())) {
+      return true;
+    }
+  }
+  return false;
+}
+
+std::optional<std::string> getEnv(const char* name) {
+  const char* value = std::getenv(name);
+  return value != nullptr ? std::optional<std::string>(value) : std::nullopt;
+}
+
+} // namespace
+
+const TlsSearchPaths& systemTlsSearchPaths() {
+  static const TlsSearchPaths paths{
+      "/etc/ssl/cert.pem",
+      "/etc/ssl/certs",
+      {
+          "/etc/ssl/certs/ca-certificates.crt", // Debian, Ubuntu, Alpine
+          "/etc/pki/tls/certs/ca-bundle.crt", // RHEL, CentOS, Rocky, Alma, 
Fedora
+          "/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", // RHEL family, 
what the link above points to
+          "/etc/ssl/ca-bundle.pem", // openSUSE
+      }};
+  return paths;
+}

Review Comment:
   Copilot suggests reading the defaults with `X509_get_default_cert_file()` / 
`X509_get_default_cert_dir()`. Not changed: no Gluten source includes the 
OpenSSL headers today, and `find_package(OpenSSL)` is only set up for 
`VCPKG_DYNAMIC_OPENSSL=ON`, so I could not confirm the include path is 
available in every build configuration. The vcpkg openssl port uses 
`--openssldir=/etc/ssl`, and `OPENSSLDIR: "/etc/ssl"` is in the built 
`libvelox.so`. Added a comment in 6d8af40a8. Can switch to the OpenSSL 
functions if you prefer; I would need a CI build to confirm it compiles 
everywhere.



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