ripplehang commented on code in PR #43601:
URL: https://github.com/apache/arrow/pull/43601#discussion_r1794926939


##########
cpp/src/arrow/filesystem/s3_test_util.cc:
##########
@@ -69,6 +77,40 @@ std::string MinioTestServer::access_key() const { return 
impl_->access_key_; }
 
 std::string MinioTestServer::secret_key() const { return impl_->secret_key_; }
 
+std::string MinioTestServer::ca_path() const {
+  return impl_->temp_dir_ca_->path().ToString();
+}
+
+std::string MinioTestServer::scheme() const { return impl_->scheme_; }
+
+Status MinioTestServer::GenerateCertificateFile() {
+  // create the dedicated folder for certificate file, rather than reuse the 
data
+  // folder, since there is test case to check whether the folder is empty.
+  ARROW_ASSIGN_OR_RAISE(impl_->temp_dir_ca_, 
TemporaryDir::Make("s3fs-test-ca-"));
+
+  ARROW_ASSIGN_OR_RAISE(auto public_crt_file,
+                        PlatformFilename::FromString(ca_path() + 
"/public.crt"));
+  ARROW_ASSIGN_OR_RAISE(auto public_cert_fd, 
FileOpenWritable(public_crt_file));
+  ARROW_RETURN_NOT_OK(FileWrite(public_cert_fd.fd(),
+                                reinterpret_cast<const uint8_t*>(kMinioCert),
+                                strlen(kMinioCert)));
+  ARROW_RETURN_NOT_OK(public_cert_fd.Close());
+
+  ARROW_ASSIGN_OR_RAISE(auto private_key_file,
+                        PlatformFilename::FromString(ca_path() + 
"/private.key"));
+  ARROW_ASSIGN_OR_RAISE(auto private_key_fd, 
FileOpenWritable(private_key_file));
+  ARROW_RETURN_NOT_OK(FileWrite(private_key_fd.fd(),
+                                reinterpret_cast<const 
uint8_t*>(kMinioPrivateKey),
+                                strlen(kMinioPrivateKey)));
+  ARROW_RETURN_NOT_OK(private_key_fd.Close());
+
+  arrow::fs::FileSystemGlobalOptions global_options;
+  global_options.tls_verify_certificates = false;

Review Comment:
   @pitrou Another issue here to set the `ca_file` is, the aws sdk would not 
only verify the certificate file but also verfiy the host if the ca_file is 
set. see 
https://github.com/aws/aws-sdk-cpp/blob/bb7d5a0f991efef6c6cb1f970bc04e0def765704/src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp#L758
   however, according to 
https://github.com/apache/arrow/blob/main/cpp/src/arrow/testing/util.cc#L186, 
the actual endpoint name changes in range 127.0.0.0/8, and in my self-signed 
certificate file, I only set the 127.0.0.1 and localhost ad the alt_names, so 
the TLS handshake would fail. 
   



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