[sse-c] enable encryption in multipart uploads + refactoringsse-c2

1 files changed, 42 insertions, 22 deletions

diff --git a/src/api/s3/encryption.rs b/src/api/s3/encryption.rs
index 17974df1..723aeb07 100644
--- a/src/api/s3/encryption.rs
+++ b/src/api/s3/encryption.rs
@@ -46,7 +46,7 @@ const X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY: HeaderName =
 const X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5: HeaderName =
 	HeaderName::from_static("x-amz-copy-source-server-side-encryption-customer-key-md5");
 
-const CUSTOMER_ALGORITHM_AES256: HeaderValue = HeaderValue::from_static("AES256");
+const CUSTOMER_ALGORITHM_AES256: &[u8] = b"AES256";
 
 type StreamNonceSize = aes_gcm::aead::stream::NonceSize<Aes256Gcm, StreamLE31<Aes256Gcm>>;
 
@@ -86,7 +86,7 @@ impl EncryptionParams {
 		}
 	}
 
-	pub fn check_decrypt_for_get<'a>(
+	pub fn check_decrypt<'a>(
 		garage: &Garage,
 		req: &Request<impl Body>,
 		obj_enc: &'a ObjectVersionEncryption,
@@ -97,7 +97,7 @@ impl EncryptionParams {
 			&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY,
 			&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5,
 		)?;
-		Self::check_decrypt(garage, key, obj_enc)
+		Self::check_decrypt_common(garage, key, obj_enc)
 	}
 
 	pub fn check_decrypt_for_copy_source<'a>(
@@ -111,10 +111,10 @@ impl EncryptionParams {
 			&X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY,
 			&X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5,
 		)?;
-		Self::check_decrypt(garage, key, obj_enc)
+		Self::check_decrypt_common(garage, key, obj_enc)
 	}
 
-	fn check_decrypt<'a>(
+	fn check_decrypt_common<'a>(
 		garage: &Garage,
 		key: Option<Key<Aes256Gcm>>,
 		obj_enc: &'a ObjectVersionEncryption,
@@ -294,34 +294,46 @@ fn parse_request_headers(
 	key_header: &HeaderName,
 	md5_header: &HeaderName,
 ) -> Result<Option<Key<Aes256Gcm>>, Error> {
-	match req.headers().get(alg_header) {
-		Some(alg) if *alg == CUSTOMER_ALGORITHM_AES256 => {
+	parse_encryption_params(
+		req.headers().get(alg_header).map(HeaderValue::as_bytes),
+		req.headers().get(key_header).map(HeaderValue::as_bytes),
+		req.headers().get(md5_header).map(HeaderValue::as_bytes),
+	)
+}
+
+fn parse_encryption_params(
+	alg: Option<&[u8]>,
+	key: Option<&[u8]>,
+	md5: Option<&[u8]>,
+) -> Result<Option<Key<Aes256Gcm>>, Error> {
+	match alg {
+		Some(CUSTOMER_ALGORITHM_AES256) => {
 			use md5::{Digest, Md5};
 
-			let key_b64 = req
-				.headers()
-				.get(key_header)
-				.ok_or_bad_request(format!("Missing {} header", key_header))?;
+			let key_b64 =
+				key.ok_or_bad_request("Missing server-side-encryption-customer-key header")?;
 			let key_bytes: [u8; 32] = BASE64_STANDARD
 				.decode(&key_b64)
-				.ok_or_bad_request(format!("Invalid {} header", key_header))?
+				.ok_or_bad_request(
+					"Invalid server-side-encryption-customer-key header: invalid base64",
+				)?
 				.try_into()
 				.ok()
-				.ok_or_bad_request(format!("Invalid {} header", key_header))?;
+				.ok_or_bad_request(
+					"Invalid server-side-encryption-customer-key header: invalid length",
+				)?;
 
-			let md5_b64 = req
-				.headers()
-				.get(md5_header)
-				.ok_or_bad_request(format!("Missing {} header", md5_header))?;
-			let md5_bytes = BASE64_STANDARD
-				.decode(&md5_b64)
-				.ok_or_bad_request(format!("Invalid {} header", md5_header))?;
+			let md5_b64 =
+				md5.ok_or_bad_request("Missing server-side-encryption-customer-key-md5 header")?;
+			let md5_bytes = BASE64_STANDARD.decode(&md5_b64).ok_or_bad_request(
+				"Invalid server-side-encryption-customer-key-md5 header: invalid bass64",
+			)?;
 
 			let mut hasher = Md5::new();
 			hasher.update(&key_bytes[..]);
 			if hasher.finalize().as_slice() != md5_bytes.as_slice() {
 				return Err(Error::bad_request(
-					"Encryption key MD5 checksum does not match",
+					"Server-side encryption client key MD5 checksum does not match",
 				));
 			}
 
@@ -330,7 +342,15 @@ fn parse_request_headers(
 		Some(alg) => Err(Error::InvalidEncryptionAlgorithm(
 			alg.to_str().unwrap_or("??").to_string(),
 		)),
-		None => Ok(None),
+		None => {
+			if key.is_some() || md5.is_some() {
+				Err(Error::bad_request(
+					"Unexpected server-side-encryption-customer-key{,-md5} header(s)",
+				))
+			} else {
+				Ok(None)
+			}
+		}
 	}
 }