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Adds support for Unsigned-Payload type of SigV4 signatures. Also a small bug fix. #45

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Adds support for Unsigned-Payload type of SigV4 signatures. Also a small bug fix. #45

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a176ae2
Add support for Unsigned-Payload type of SigV4 signatures.
MegaWattSec Jun 13, 2024
6dc766a
Fix issue with extra spaces in calculated headers. Some servers retur…
MegaWattSec Jun 13, 2024
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16 changes: 14 additions & 2 deletions src/main/java/com/netspi/awssigner/signing/DelegatingAwsRequestSigner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
import java.util.stream.Collectors;
import software.amazon.awssdk.auth.credentials.AwsCredentials;
import software.amazon.awssdk.auth.signer.Aws4Signer;
import software.amazon.awssdk.auth.signer.Aws4UnsignedPayloadSigner;
import software.amazon.awssdk.auth.signer.AwsS3V4Signer;
import software.amazon.awssdk.auth.signer.AwsSignerExecutionAttribute;
import software.amazon.awssdk.auth.signer.S3SignerExecutionAttribute;
Expand Down Expand Up @@ -95,13 +96,21 @@ public byte[] sign(IHttpRequestResponse messageInfo, IRequestInfo request, Parse
}).map(header -> {
//Only keep the header's value.
//We know from the filter that there is a colon character, so this is safe.
return header.split(":", 2)[1];
return header.split(":", 2)[1].trim();
}).collect(Collectors.toList());
LogWriter.logDebug("For header \"" + signedHeader + "\" found the following values: " + headerValues);
signedHeaderMap.put(signedHeader, headerValues);
}
LogWriter.logDebug("signedHeaderMap: " + signedHeaderMap);

//Check header for UNSIGNED-PAYLOAD, indicating auth type v4-unsigned-body is used. There may be other possible indicators.
boolean unsignedBodyType = false;
for(List<String> value: signedHeaderMap.values()){
if (value.contains("UNSIGNED-PAYLOAD")){
unsignedBodyType = true;
}
}

//Build request object for signing
URI uri;
try {
Expand Down Expand Up @@ -185,7 +194,7 @@ public byte[] sign(IHttpRequestResponse messageInfo, IRequestInfo request, Parse
.map(header -> {
//Only keep the header's value.
//We know from the filter that there is a colon character, so this is safe.
return header.split(":", 2)[1];
return header.split(":", 2)[1].trim();
}).findFirst();

//We want to find the right region for our request
Expand Down Expand Up @@ -228,6 +237,9 @@ public byte[] sign(IHttpRequestResponse messageInfo, IRequestInfo request, Parse
if (authHeader.getAlgorithm() == SigningAlgorithm.SIGV4A) {
LogWriter.logDebug("Handling non-S3 SigV4a signature.");
signer = AwsCrtV4aSigner.create();
} else if (unsignedBodyType) {
LogWriter.logDebug("Handling unsigned payload SigV4 signature.");
signer = Aws4UnsignedPayloadSigner.create();
} else {
LogWriter.logDebug("Handling non-S3 SigV4 signature.");
signer = Aws4Signer.create();
Expand Down