[sse-c] Implement SSE-C encryption

src/api/s3/put.rs

@@ -36,10 +36,18 @@ use garage_model::s3::version_table::*;
 
 use crate::helpers::*;
 use crate::s3::api_server::{ReqBody, ResBody};
+use crate::s3::encryption::EncryptionParams;
 use crate::s3::error::*;
 
 const PUT_BLOCKS_MAX_PARALLEL: usize = 3;
 
+pub struct SaveStreamResult {
+	pub version_uuid: Uuid,
+	pub version_timestamp: u64,
+	/// Etag WITHOUT THE QUOTES (just the hex value)
+	pub etag: String,
+}
+
 pub async fn handle_put(
 	ctx: ReqCtx,
 	req: Request<ReqBody>,
@@ -50,6 +58,9 @@ pub async fn handle_put(
 	let headers = get_headers(req.headers())?;
 	debug!("Object headers: {:?}", headers);
 
+	// Determine whether object should be encrypted, and if so the key
+	let encryption = EncryptionParams::new_from_headers(&ctx.garage, req.headers())?;
+
 	let content_md5 = match req.headers().get("content-md5") {
 		Some(x) => Some(x.to_str()?.to_string()),
 		None => None,
@@ -57,19 +68,33 @@ pub async fn handle_put(
 
 	let stream = body_stream(req.into_body());
 
-	save_stream(&ctx, headers, stream, key, content_md5, content_sha256)
-		.await
-		.map(|(uuid, md5)| put_response(uuid, md5))
+	let res = save_stream(
+		&ctx,
+		headers,
+		encryption,
+		stream,
+		key,
+		content_md5,
+		content_sha256,
+	)
+	.await?;
+
+	let mut resp = Response::builder()
+		.header("x-amz-version-id", hex::encode(res.version_uuid))
+		.header("ETag", format!("\"{}\"", res.etag));
+	encryption.add_response_headers(&mut resp);
+	Ok(resp.body(empty_body())?)
 }
 
 pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	ctx: &ReqCtx,
 	headers: ObjectVersionHeaders,
+	encryption: EncryptionParams,
 	body: S,
 	key: &String,
 	content_md5: Option<String>,
 	content_sha256: Option<FixedBytes32>,
-) -> Result<(Uuid, String), Error> {
+) -> Result<SaveStreamResult, Error> {
 	let ReqCtx {
 		garage, bucket_id, ..
 	} = ctx;
@@ -82,6 +107,8 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 
 	let first_block = first_block_opt.unwrap_or_default();
 
+	let object_encryption = encryption.encrypt_headers(headers)?;
+
 	// Generate identity of new version
 	let version_uuid = gen_uuid();
 	let version_timestamp = next_timestamp(existing_object.as_ref());
@@ -92,37 +119,43 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 		let mut md5sum = Md5::new();
 		md5sum.update(&first_block[..]);
 		let data_md5sum = md5sum.finalize();
-		let data_md5sum_hex = hex::encode(data_md5sum);
 
 		let data_sha256sum = sha256sum(&first_block[..]);
-		let size = first_block.len() as u64;
 
 		ensure_checksum_matches(
-			data_md5sum.as_slice(),
+			&data_md5sum,
 			data_sha256sum,
 			content_md5.as_deref(),
 			content_sha256,
 		)?;
 
+		let size = first_block.len() as u64;
 		check_quotas(ctx, size, existing_object.as_ref()).await?;
 
+		let etag = encryption.etag_from_md5(&data_md5sum);
+		let inline_data = encryption.encrypt_blob(&first_block)?.to_vec();
+
 		let object_version = ObjectVersion {
 			uuid: version_uuid,
 			timestamp: version_timestamp,
 			state: ObjectVersionState::Complete(ObjectVersionData::Inline(
 				ObjectVersionMeta {
-					headers,
+					encryption: object_encryption,
 					size,
-					etag: data_md5sum_hex.clone(),
+					etag: etag.clone(),
 				},
-				first_block.to_vec(),
+				inline_data,
 			)),
 		};
 
 		let object = Object::new(*bucket_id, key.into(), vec![object_version]);
 		garage.object_table.insert(&object).await?;
 
-		return Ok((version_uuid, data_md5sum_hex));
+		return Ok(SaveStreamResult {
+			version_uuid,
+			version_timestamp,
+			etag,
+		});
 	}
 
 	// The following consists in many steps that can each fail.
@@ -142,7 +175,7 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 		uuid: version_uuid,
 		timestamp: version_timestamp,
 		state: ObjectVersionState::Uploading {
-			headers: headers.clone(),
+			encryption: object_encryption.clone(),
 			multipart: false,
 		},
 	};
@@ -165,10 +198,10 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 
 	// Transfer data and verify checksum
 	let (total_size, data_md5sum, data_sha256sum, first_block_hash) =
-		read_and_put_blocks(ctx, &version, 1, first_block, &mut chunker).await?;
+		read_and_put_blocks(ctx, &version, encryption, 1, first_block, &mut chunker).await?;
 
 	ensure_checksum_matches(
-		data_md5sum.as_slice(),
+		&data_md5sum,
 		data_sha256sum,
 		content_md5.as_deref(),
 		content_sha256,
@@ -177,12 +210,13 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	check_quotas(ctx, total_size, existing_object.as_ref()).await?;
 
 	// Save final object state, marked as Complete
-	let md5sum_hex = hex::encode(data_md5sum);
+	let etag = encryption.etag_from_md5(&data_md5sum);
+
 	object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
 		ObjectVersionMeta {
-			headers,
+			encryption: object_encryption,
 			size: total_size,
-			etag: md5sum_hex.clone(),
+			etag: etag.clone(),
 		},
 		first_block_hash,
 	));
@@ -193,7 +227,11 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	// We won't have to clean up on drop.
 	interrupted_cleanup.cancel();
 
-	Ok((version_uuid, md5sum_hex))
+	Ok(SaveStreamResult {
+		version_uuid,
+		version_timestamp,
+		etag,
+	})
 }
 
 /// Validate MD5 sum against content-md5 header
@@ -290,6 +328,7 @@ pub(crate) async fn check_quotas(
 pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	ctx: &ReqCtx,
 	version: &Version,
+	encryption: EncryptionParams,
 	part_number: u64,
 	first_block: Bytes,
 	chunker: &mut StreamChunker<S>,
@@ -349,12 +388,31 @@ pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> +
 		))
 	};
 
-	let (block_tx3, mut block_rx3) = mpsc::channel::<Result<(Bytes, Hash), Error>>(1);
-	let hash_blocks = async {
+	let (block_tx3, mut block_rx3) = mpsc::channel::<Result<(Bytes, u64, Hash), Error>>(1);
+	let encrypt_hash_blocks = async {
 		let mut first_block_hash = None;
 		while let Some(next) = block_rx2.recv().await {
 			match next {
 				Ok(block) => {
+					let unencrypted_len = block.len() as u64;
+					let block = if encryption.is_encrypted() {
+						let res =
+							tokio::task::spawn_blocking(move || encryption.encrypt_block(block))
+								.with_context(Context::current_with_span(
+									tracer.start("Encrypt block"),
+								))
+								.await
+								.unwrap();
+						match res {
+							Ok(b) => b,
+							Err(e) => {
+								block_tx3.send(Err(e)).await?;
+								break;
+							}
+						}
+					} else {
+						block
+					};
 					let hash = async_blake2sum(block.clone())
 						.with_context(Context::current_with_span(
 							tracer.start("Hash block (blake2)"),
@@ -363,7 +421,7 @@ pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> +
 					if first_block_hash.is_none() {
 						first_block_hash = Some(hash);
 					}
-					block_tx3.send(Ok((block, hash))).await?;
+					block_tx3.send(Ok((block, unencrypted_len, hash))).await?;
 				}
 				Err(e) => {
 					block_tx3.send(Err(e)).await?;
@@ -398,7 +456,7 @@ pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> +
 					block_rx3.recv().await
 				}
 			};
-			let (block, hash) = tokio::select! {
+			let (block, unencrypted_len, hash) = tokio::select! {
 				result = write_futs_next => {
 					result?;
 					continue;
@@ -410,17 +468,18 @@ pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> +
 			};
 
 			// For next block to be written: count its size and spawn future to write it
-			let offset = written_bytes;
-			written_bytes += block.len() as u64;
 			write_futs.push_back(put_block_and_meta(
 				ctx,
 				version,
 				part_number,
-				offset,
+				written_bytes,
 				hash,
 				block,
+				unencrypted_len,
+				encryption.is_encrypted(),
 				order_stream.order(written_bytes),
 			));
+			written_bytes += unencrypted_len;
 		}
 		while let Some(res) = write_futs.next().await {
 			res?;
@@ -429,7 +488,7 @@ pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> +
 	};
 
 	let (_, stream_hash_result, block_hash_result, final_result) =
-		futures::join!(read_blocks, hash_stream, hash_blocks, put_blocks);
+		futures::join!(read_blocks, hash_stream, encrypt_hash_blocks, put_blocks);
 
 	let total_size = final_result?;
 	// unwrap here is ok, because if hasher failed, it is because something failed
@@ -449,6 +508,8 @@ async fn put_block_and_meta(
 	offset: u64,
 	hash: Hash,
 	block: Bytes,
+	size: u64,
+	is_encrypted: bool,
 	order_tag: OrderTag,
 ) -> Result<(), GarageError> {
 	let ReqCtx { garage, .. } = ctx;
@@ -459,10 +520,7 @@ async fn put_block_and_meta(
 			part_number,
 			offset,
 		},
-		VersionBlock {
-			hash,
-			size: block.len() as u64,
-		},
+		VersionBlock { hash, size },
 	);
 
 	let block_ref = BlockRef {
@@ -474,7 +532,7 @@ async fn put_block_and_meta(
 	futures::try_join!(
 		garage
 			.block_manager
-			.rpc_put_block(hash, block, Some(order_tag)),
+			.rpc_put_block(hash, block, is_encrypted, Some(order_tag)),
 		garage.version_table.insert(&version),
 		garage.block_ref_table.insert(&block_ref),
 	)?;
@@ -517,14 +575,6 @@ impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
 	}
 }
 
-pub fn put_response(version_uuid: Uuid, md5sum_hex: String) -> Response<ResBody> {
-	Response::builder()
-		.header("x-amz-version-id", hex::encode(version_uuid))
-		.header("ETag", format!("\"{}\"", md5sum_hex))
-		.body(empty_body())
-		.unwrap()
-}
-
 struct InterruptedCleanup(Option<InterruptedCleanupInner>);
 struct InterruptedCleanupInner {
 	garage: Arc<Garage>,