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[fix-presigned] write comments

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Alex 2024-02-27 23:46:49 +01:00
parent 4c1d42cc5f
commit a5e4bfeae9
Signed by untrusted user: lx
GPG key ID: 0E496D15096376BE
1 changed files with 16 additions and 5 deletions
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21
src/api/signature/payload.rs
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@ -40,10 +40,10 @@ pub async fn check_payload_signature(
) -> Result<(Option<Key>, Option<Hash>), Error> { ) -> Result<(Option<Key>, Option<Hash>), Error> {
let query = parse_query_map(request.uri())?; let query = parse_query_map(request.uri())?;
if query.contains_key(X_AMZ_ALGORITHM.as_str()) { if request.headers().contains_key(AUTHORIZATION) {
check_presigned_signature(garage, service, request, query).await
} else if request.headers().contains_key(AUTHORIZATION) {
check_standard_signature(garage, service, request, query).await check_standard_signature(garage, service, request, query).await
} else if query.contains_key(X_AMZ_ALGORITHM.as_str()) {
check_presigned_signature(garage, service, request, query).await
} else { } else {
// Unsigned (anonymous) request // Unsigned (anonymous) request
let content_sha256 = request let content_sha256 = request
@ -70,7 +70,11 @@ async fn check_standard_signature(
) -> Result<(Option<Key>, Option<Hash>), Error> { ) -> Result<(Option<Key>, Option<Hash>), Error> {
let authorization = Authorization::parse(request.headers())?; let authorization = Authorization::parse(request.headers())?;
// Verify that all necessary request headers are signed // Verify that all necessary request headers are included in signed_headers
// For standard AWSv4 signatures, the following must be incldued:
// - the Host header (in all cases)
// - the Content-Type header, if it is used in the request
// - all x-amz-* headers used in the request
let signed_headers = split_signed_headers(&authorization)?; let signed_headers = split_signed_headers(&authorization)?;
if !signed_headers.contains(&HOST) { if !signed_headers.contains(&HOST) {
return Err(Error::bad_request("Header `Host` should be signed")); return Err(Error::bad_request("Header `Host` should be signed"));
@ -129,7 +133,10 @@ async fn check_presigned_signature(
let algorithm = query.get(X_AMZ_ALGORITHM.as_str()).unwrap(); let algorithm = query.get(X_AMZ_ALGORITHM.as_str()).unwrap();
let authorization = Authorization::parse_presigned(algorithm, &query)?; let authorization = Authorization::parse_presigned(algorithm, &query)?;
// Check that all mandatory signed headers are included // Verify that all necessary request headers are included in signed_headers
// For AWSv4 pre-signed URLs, the following must be incldued:
// - the Host header (in all cases)
// - all x-amz-* headers used in the request
let signed_headers = split_signed_headers(&authorization)?; let signed_headers = split_signed_headers(&authorization)?;
if !signed_headers.contains(&HOST) { if !signed_headers.contains(&HOST) {
return Err(Error::bad_request("Header `Host` should be signed")); return Err(Error::bad_request("Header `Host` should be signed"));
@ -145,6 +152,10 @@ async fn check_presigned_signature(
} }
} }
// The X-Amz-Signature value is passed as a query parameter,
// but the signature cannot be computed from a string that contains itself.
// AWS specifies that all query params except X-Amz-Signature are included
// in the canonical request.
query.remove(X_AMZ_SIGNATURE.as_str()); query.remove(X_AMZ_SIGNATURE.as_str());
let canonical_request = canonical_request( let canonical_request = canonical_request(
service, service,