/*************************************************************************
* Copyright 2009-2013 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
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* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
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*
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************************************************************************/
package com.eucalyptus.objectstorage.pipeline.handlers;
import com.eucalyptus.crypto.Digest;
import com.eucalyptus.crypto.util.SecurityParameter;
import com.eucalyptus.http.MappingHttpRequest;
import com.eucalyptus.objectstorage.exceptions.s3.AccessDeniedException;
import com.eucalyptus.objectstorage.exceptions.s3.XAmzContentSHA256MismatchException;
import com.eucalyptus.objectstorage.pipeline.handlers.AwsChunkStream.StreamingHttpRequest;
import com.google.common.base.Strings;
import com.google.common.io.BaseEncoding;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.UpstreamMessageEvent;
import org.jboss.netty.handler.codec.http.HttpChunk;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import static com.eucalyptus.objectstorage.pipeline.auth.S3V4Authentication.AWS_CONTENT_SHA_HEADER;
import static com.eucalyptus.objectstorage.pipeline.auth.S3V4Authentication.AWS_V4_AUTH_TYPE;
import static com.eucalyptus.objectstorage.pipeline.auth.S3V4Authentication.STREAMING_PAYLOAD;
import static com.eucalyptus.objectstorage.pipeline.auth.S3V4Authentication.UNSIGNED_PAYLOAD;
import java.security.MessageDigest;
/**
* Aggregates streaming and chunked data for V4 signed request authentication.
*/
public class ObjectStorageAuthenticationAggregator implements ChannelUpstreamHandler {
// Content validation
private MessageDigest contentDigest;
private byte[] expectedDigest;
// Streaming request state
private MappingHttpRequest initialRequest;
private AwsChunkStream awsChunkStream;
@Override
public void handleUpstream(final ChannelHandlerContext ctx, final ChannelEvent channelEvent) throws Exception {
if (channelEvent instanceof MessageEvent) {
handleUpstreamMessage(ctx, (MessageEvent) channelEvent);
} else {
ctx.sendUpstream(channelEvent);
}
}
private void handleUpstreamMessage(final ChannelHandlerContext ctx, MessageEvent event) throws Exception {
final Object msg = event.getMessage();
boolean lastPart = false;
if (initialRequest == null && msg instanceof MappingHttpRequest) {
final MappingHttpRequest request = (MappingHttpRequest) msg;
final String authHeader = request.getHeader(SecurityParameter.Authorization.toString());
final String shaHeader = request.getHeader(AWS_CONTENT_SHA_HEADER);
if (STREAMING_PAYLOAD.equals(shaHeader)) {
// Handle V4 streaming requests
initialRequest = request;
awsChunkStream = new AwsChunkStream();
// Handle initial request body, if any
StreamingHttpRequest streamingRequest = awsChunkStream.append(initialRequest);
if (streamingRequest != null)
event = new UpstreamMessageEvent(ctx.getChannel(), streamingRequest, event.getRemoteAddress());
ctx.sendUpstream(event);
return;
} else if (!Strings.isNullOrEmpty(authHeader) && authHeader.startsWith(AWS_V4_AUTH_TYPE) && !UNSIGNED_PAYLOAD.equals(shaHeader)) {
// Handle content validation for V4 non-streaming requests
expectedDigest = BaseEncoding.base16().lowerCase().decode(shaHeader);
contentDigest = Digest.SHA256.get();
contentDigest.update(request.getContent().toByteBuffer());
lastPart = !request.isChunked();
}
} else if (msg instanceof HttpChunk) {
final HttpChunk chunk = (HttpChunk) msg;
// Handle V4 streaming chunks
if (initialRequest != null) {
if (!chunk.isLast()) {
StreamingHttpRequest streamingRequest = awsChunkStream.append(chunk);
if (streamingRequest != null) {
streamingRequest.setInitialRequest(initialRequest);
ctx.sendUpstream(new UpstreamMessageEvent(ctx.getChannel(), streamingRequest, event.getRemoteAddress()));
}
} else {
ctx.sendUpstream(event);
}
return;
} else if (expectedDigest != null) {
contentDigest.update(chunk.getContent().toByteBuffer());
lastPart = chunk.isLast();
}
}
if (lastPart && !MessageDigest.isEqual(expectedDigest, contentDigest.digest())) {
Channels.fireExceptionCaught(ctx, new XAmzContentSHA256MismatchException());
return;
}
ctx.sendUpstream(event);
}
}