Auth Manager API part 5: SigV4 Auth Manager

aws/src/main/java/org/apache/iceberg/aws/RESTSigV4AuthManager.java

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+/*
+ * 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.
+ */
+package org.apache.iceberg.aws;
+
+import java.util.Map;
+import org.apache.iceberg.catalog.SessionCatalog;
+import org.apache.iceberg.catalog.TableIdentifier;
+import org.apache.iceberg.rest.RESTClient;
+import org.apache.iceberg.rest.RESTUtil;
+import org.apache.iceberg.rest.auth.AuthManager;
+import org.apache.iceberg.rest.auth.AuthSession;
+import software.amazon.awssdk.auth.signer.Aws4Signer;
+
+/**
+ * An AuthManager that authenticates requests with SigV4.
+ *
+ * <p>It takes a delegate AuthManager to handle double authentication cases, e.g. on top of OAuth2.
+ */
+@SuppressWarnings("unused") // loaded by reflection
+public class RESTSigV4AuthManager implements AuthManager {
+
+  private final Aws4Signer signer = Aws4Signer.create();
+  private final AuthManager delegate;
+
+  private Map<String, String> catalogProperties;
+
+  public RESTSigV4AuthManager(String name, AuthManager delegate) {
+    this.delegate = delegate;
+  }
+
+  @Override
+  public RESTSigV4AuthSession initSession(RESTClient initClient, Map<String, String> properties) {
+    return new RESTSigV4AuthSession(
+        signer, delegate.initSession(initClient, properties), new AwsProperties(properties));
+  }
+
+  @Override
+  public RESTSigV4AuthSession catalogSession(
+      RESTClient sharedClient, Map<String, String> properties) {
+    catalogProperties = properties;
+    AwsProperties awsProperties = new AwsProperties(catalogProperties);
+    return new RESTSigV4AuthSession(
+        signer, delegate.catalogSession(sharedClient, catalogProperties), awsProperties);
+  }
+
+  @Override
+  public AuthSession contextualSession(SessionCatalog.SessionContext context, AuthSession parent) {
+    AwsProperties contextProperties =
+        new AwsProperties(RESTUtil.merge(catalogProperties, context.properties()));
+    return new RESTSigV4AuthSession(
+        signer, delegate.contextualSession(context, parent), contextProperties);
+  }
+
+  @Override
+  public AuthSession tableSession(
+      TableIdentifier table, Map<String, String> properties, AuthSession parent) {
+    AwsProperties tableProperties =
+        new AwsProperties(RESTUtil.merge(catalogProperties, properties));
+    return new RESTSigV4AuthSession(
+        signer, delegate.tableSession(table, properties, parent), tableProperties);
+  }
+
+  @Override
+  public void close() {
+    delegate.close();
+  }
+}

aws/src/main/java/org/apache/iceberg/aws/RESTSigV4AuthSession.java

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+/*
+ * 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.
+ */
+package org.apache.iceberg.aws;
+
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import org.apache.commons.io.IOUtils;
+import org.apache.iceberg.rest.HTTPHeaders;
+import org.apache.iceberg.rest.HTTPHeaders.HTTPHeader;
+import org.apache.iceberg.rest.HTTPRequest;
+import org.apache.iceberg.rest.ImmutableHTTPHeaders;
+import org.apache.iceberg.rest.ImmutableHTTPRequest;
+import org.apache.iceberg.rest.auth.AuthSession;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.auth.signer.Aws4Signer;
+import software.amazon.awssdk.auth.signer.internal.SignerConstant;
+import software.amazon.awssdk.auth.signer.params.Aws4SignerParams;
+import software.amazon.awssdk.auth.signer.params.SignerChecksumParams;
+import software.amazon.awssdk.core.checksums.Algorithm;
+import software.amazon.awssdk.http.SdkHttpFullRequest;
+import software.amazon.awssdk.http.SdkHttpMethod;
+import software.amazon.awssdk.regions.Region;
+
+/**
+ * An AuthSession that signs requests with SigV4.
+ *
+ * <p>The request is first authenticated by the delegate AuthSession, then signed with SigV4. In
+ * case of conflicting headers, the Authorization header set by delegate AuthSession will be
+ * relocated, then included in the canonical headers to sign.
+ *
+ * <p>See <a href="https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_sigv.html">Signing AWS
+ * API requests</a> for details about the SigV4 protocol.
+ */
+public class RESTSigV4AuthSession implements AuthSession {
+
+  static final String EMPTY_BODY_SHA256 =
+      "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
+  static final String RELOCATED_HEADER_PREFIX = "Original-";
+
+  private final Aws4Signer signer;
+  private final AuthSession delegate;
+  private final Region signingRegion;
+  private final String signingName;
+  private final AwsCredentialsProvider credentialsProvider;
+
+  public RESTSigV4AuthSession(
+      Aws4Signer aws4Signer, AuthSession delegateAuthSession, AwsProperties awsProperties) {
+    this.signer = aws4Signer;
+    this.delegate = delegateAuthSession;
+    this.signingRegion = awsProperties.restSigningRegion();
+    this.signingName = awsProperties.restSigningName();
+    this.credentialsProvider = awsProperties.restCredentialsProvider();
+  }
+
+  @Override
+  public HTTPRequest authenticate(HTTPRequest request) {
+    return sign(delegate.authenticate(request));
+  }
+
+  @Override
+  public void close() {
+    delegate.close();
+  }
+
+  private HTTPRequest sign(HTTPRequest request) {
+    Aws4SignerParams params =
+        Aws4SignerParams.builder()
+            .signingName(signingName)
+            .signingRegion(signingRegion)
+            .awsCredentials(credentialsProvider.resolveCredentials())
+            .checksumParams(
+                SignerChecksumParams.builder()
+                    .algorithm(Algorithm.SHA256)
+                    .isStreamingRequest(false)
+                    .checksumHeaderName(SignerConstant.X_AMZ_CONTENT_SHA256)
+                    .build())
+            .build();
+
+    SdkHttpFullRequest.Builder sdkRequestBuilder = SdkHttpFullRequest.builder();
+
+    URI uri = request.requestUri();
+    sdkRequestBuilder
+        .method(SdkHttpMethod.fromValue(request.method().name()))
+        .protocol(uri.getScheme())
+        .uri(uri)
+        .headers(convertHeaders(request.headers()));
+
+    String body = request.encodedBody();
+    if (body == null) {
+      // This is a workaround for the signer implementation incorrectly producing
+      // an invalid content checksum for empty body requests.
+      sdkRequestBuilder.putHeader(SignerConstant.X_AMZ_CONTENT_SHA256, EMPTY_BODY_SHA256);
+    } else {
+      sdkRequestBuilder.contentStreamProvider(
+          () -> IOUtils.toInputStream(body, StandardCharsets.UTF_8));
+    }
+
+    SdkHttpFullRequest signedSdkRequest = signer.sign(sdkRequestBuilder.build(), params);
+    HTTPHeaders newHeaders = updateRequestHeaders(request.headers(), signedSdkRequest.headers());
+    return ImmutableHTTPRequest.builder().from(request).headers(newHeaders).build();
+  }
+
+  private Map<String, List<String>> convertHeaders(HTTPHeaders headers) {
+    return headers.entries().stream()
+        .collect(
+            Collectors.groupingBy(
+                // Relocate Authorization header as SigV4 takes precedence
+                header ->
+                    header.name().equalsIgnoreCase("Authorization")
+                        ? RELOCATED_HEADER_PREFIX + header.name()
+                        : header.name(),
+                Collectors.mapping(HTTPHeader::value, Collectors.toList())));
+  }
+
+  private HTTPHeaders updateRequestHeaders(
+      HTTPHeaders originalHeaders, Map<String, List<String>> signedHeaders) {
+    ImmutableHTTPHeaders.Builder newHeaders = ImmutableHTTPHeaders.builder();
+    signedHeaders.forEach(
+        (name, signedValues) -> {
+          if (originalHeaders.contains(name)) {
+            for (HTTPHeader originalHeader : originalHeaders.entries(name)) {
+              // Relocate headers if there is a conflict with signed headers
+              if (!signedValues.contains(originalHeader.value())) {
+                newHeaders.addEntry(
+                    HTTPHeader.of(RELOCATED_HEADER_PREFIX + name, originalHeader.value()));
+              }
+            }
+          }
+
+          signedValues.forEach(value -> newHeaders.addEntry(HTTPHeader.of(name, value)));
+        });
+
+    return newHeaders.build();
+  }
+}