Support STREAMING-AWS4-HMAC-SHA256-PAYLOAD (#64) (#156)

Closes #64.

Reviewed-on: Deuxfleurs/garage#156
Co-authored-by: Jill <kokakiwi@deuxfleurs.fr>
Co-committed-by: Jill <kokakiwi@deuxfleurs.fr>

Cargo.lock

@@ -433,7 +433,9 @@ dependencies = [
  "idna",
  "log",
  "md-5",
+ "nom",
  "percent-encoding",
+ "pin-project",
  "quick-xml",
  "roxmltree",
  "serde",
@@ -967,6 +969,12 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "mio"
 version = "0.7.13"
@@ -1011,6 +1019,17 @@ dependencies = [
  "tokio-util",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+ "version_check",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.3.6"
@@ -1092,6 +1111,26 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
+[[package]]
+name = "pin-project"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "576bc800220cc65dac09e99e97b08b358cfab6e17078de8dc5fee223bd2d0c08"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e8fe8163d14ce7f0cdac2e040116f22eac817edabff0be91e8aff7e9accf389"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.7"

Cargo.nix

@@ -671,7 +671,9 @@ in
       idna = rustPackages."registry+https://github.com/rust-lang/crates.io-index".idna."0.2.3" { inherit profileName; };
       log = rustPackages."registry+https://github.com/rust-lang/crates.io-index".log."0.4.14" { inherit profileName; };
       md5 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".md-5."0.9.1" { inherit profileName; };
+      nom = rustPackages."registry+https://github.com/rust-lang/crates.io-index".nom."7.1.0" { inherit profileName; };
       percent_encoding = rustPackages."registry+https://github.com/rust-lang/crates.io-index".percent-encoding."2.1.0" { inherit profileName; };
+      pin_project = rustPackages."registry+https://github.com/rust-lang/crates.io-index".pin-project."1.0.8" { inherit profileName; };
       quick_xml = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quick-xml."0.21.0" { inherit profileName; };
       roxmltree = rustPackages."registry+https://github.com/rust-lang/crates.io-index".roxmltree."0.14.1" { inherit profileName; };
       serde = rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.130" { inherit profileName; };
@@ -1321,6 +1323,16 @@ in
     };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".minimal-lexical."0.2.1" = overridableMkRustCrate (profileName: rec {
+    name = "minimal-lexical";
+    version = "0.2.1";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"; };
+    features = builtins.concatLists [
+      [ "std" ]
+    ];
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".mio."0.7.13" = overridableMkRustCrate (profileName: rec {
     name = "mio";
     version = "0.7.13";
@@ -1381,6 +1393,25 @@ in
     };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".nom."7.1.0" = overridableMkRustCrate (profileName: rec {
+    name = "nom";
+    version = "7.1.0";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"; };
+    features = builtins.concatLists [
+      [ "alloc" ]
+      [ "default" ]
+      [ "std" ]
+    ];
+    dependencies = {
+      memchr = rustPackages."registry+https://github.com/rust-lang/crates.io-index".memchr."2.4.1" { inherit profileName; };
+      minimal_lexical = rustPackages."registry+https://github.com/rust-lang/crates.io-index".minimal-lexical."0.2.1" { inherit profileName; };
+    };
+    buildDependencies = {
+      version_check = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".version_check."0.9.3" { profileName = "__noProfile"; };
+    };
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".ntapi."0.3.6" = overridableMkRustCrate (profileName: rec {
     name = "ntapi";
     version = "0.3.6";
@@ -1490,6 +1521,28 @@ in
     src = fetchCratesIo { inherit name version; sha256 = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"; };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".pin-project."1.0.8" = overridableMkRustCrate (profileName: rec {
+    name = "pin-project";
+    version = "1.0.8";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "576bc800220cc65dac09e99e97b08b358cfab6e17078de8dc5fee223bd2d0c08"; };
+    dependencies = {
+      pin_project_internal = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".pin-project-internal."1.0.8" { profileName = "__noProfile"; };
+    };
+  });
+  
+  "registry+https://github.com/rust-lang/crates.io-index".pin-project-internal."1.0.8" = overridableMkRustCrate (profileName: rec {
+    name = "pin-project-internal";
+    version = "1.0.8";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "6e8fe8163d14ce7f0cdac2e040116f22eac817edabff0be91e8aff7e9accf389"; };
+    dependencies = {
+      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.30" { inherit profileName; };
+      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.10" { inherit profileName; };
+      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.80" { inherit profileName; };
+    };
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".pin-project-lite."0.2.7" = overridableMkRustCrate (profileName: rec {
     name = "pin-project-lite";
     version = "0.2.7";

default.nix

@@ -76,7 +76,7 @@ in let
        */
        ''^(src|tests)''          # fixed default
        ''.*\.(rs|toml)$''        # fixed default
-       ''^(crdt|replication|cli|helper)''   # our crate submodules
+       ''^(crdt|replication|cli|helper|signature)''   # our crate submodules
     ];
   };
 

script/dev-env-mc.sh

@@ -8,7 +8,7 @@ cat > /tmp/garage.mc/config.json <<EOF
   "version": "10",
   "aliases": {
     "garage": {
-      "url": "https://localhost:4443",
+      "url": "http://127.0.0.1:3911",
       "accessKey": "$ACCESS_KEY",
       "secretKey": "$SECRET_KEY",
       "api": "S3v4",

src/api/Cargo.toml

@@ -28,10 +28,12 @@ hmac = "0.10"
 idna = "0.2"
 log = "0.4"
 md-5 = "0.9"
+nom = "7.1"
 sha2 = "0.9"
 
 futures = "0.3"
 futures-util = "0.3"
+pin-project = "1.0"
 tokio = { version = "1.0", default-features = false, features = ["rt", "rt-multi-thread", "io-util", "net", "time", "macros", "sync", "signal", "fs"] }
 
 http = "0.2"

src/api/api_server.rs

@@ -15,7 +15,7 @@ use garage_model::garage::Garage;
 use garage_model::key_table::Key;
 
 use crate::error::*;
-use crate::signature::check_signature;
+use crate::signature::payload::check_payload_signature;
 
 use crate::helpers::*;
 use crate::s3_bucket::*;
@@ -90,7 +90,7 @@ async fn handler(
 }
 
 async fn handler_inner(garage: Arc<Garage>, req: Request<Body>) -> Result<Response<Body>, Error> {
-	let (api_key, content_sha256) = check_signature(&garage, &req).await?;
+	let (api_key, content_sha256) = check_payload_signature(&garage, &req).await?;
 
 	let authority = req
 		.headers()
@@ -176,7 +176,7 @@ async fn handler_inner(garage: Arc<Garage>, req: Request<Body>) -> Result<Respon
 			.await
 		}
 		Endpoint::PutObject { key, .. } => {
-			handle_put(garage, req, bucket_id, &key, content_sha256).await
+			handle_put(garage, req, bucket_id, &key, &api_key, content_sha256).await
 		}
 		Endpoint::AbortMultipartUpload { key, upload_id, .. } => {
 			handle_abort_multipart_upload(garage, bucket_id, &key, &upload_id).await

src/api/s3_bucket.rs

@@ -120,7 +120,10 @@ pub async fn handle_create_bucket(
 	bucket_name: String,
 ) -> Result<Response<Body>, Error> {
 	let body = hyper::body::to_bytes(req.into_body()).await?;
-	verify_signed_content(content_sha256, &body[..])?;
+
+	if let Some(content_sha256) = content_sha256 {
+		verify_signed_content(content_sha256, &body[..])?;
+	}
 
 	let cmd =
 		parse_create_bucket_xml(&body[..]).ok_or_bad_request("Invalid create bucket XML query")?;

src/api/s3_delete.rs

@@ -81,7 +81,10 @@ pub async fn handle_delete_objects(
 	content_sha256: Option<Hash>,
 ) -> Result<Response<Body>, Error> {
 	let body = hyper::body::to_bytes(req.into_body()).await?;
-	verify_signed_content(content_sha256, &body[..])?;
+
+	if let Some(content_sha256) = content_sha256 {
+		verify_signed_content(content_sha256, &body[..])?;
+	}
 
 	let cmd_xml = roxmltree::Document::parse(std::str::from_utf8(&body)?)?;
 	let cmd = parse_delete_objects_xml(&cmd_xml).ok_or_bad_request("Invalid delete XML query")?;

src/api/s3_put.rs

@@ -1,8 +1,10 @@
 use std::collections::{BTreeMap, VecDeque};
 use std::sync::Arc;
 
-use futures::stream::*;
+use chrono::{DateTime, NaiveDateTime, Utc};
-use hyper::{Body, Request, Response};
+use futures::{prelude::*, TryFutureExt};
+use hyper::body::{Body, Bytes};
+use hyper::{Request, Response};
 use md5::{digest::generic_array::*, Digest as Md5Digest, Md5};
 use sha2::Sha256;
 
@@ -14,19 +16,23 @@ use garage_util::time::*;
 use garage_model::block::INLINE_THRESHOLD;
 use garage_model::block_ref_table::*;
 use garage_model::garage::Garage;
+use garage_model::key_table::Key;
 use garage_model::object_table::*;
 use garage_model::version_table::*;
 
 use crate::error::*;
 use crate::s3_xml;
-use crate::signature::verify_signed_content;
+use crate::signature::streaming::SignedPayloadStream;
+use crate::signature::LONG_DATETIME;
+use crate::signature::{compute_scope, verify_signed_content};
 
 pub async fn handle_put(
 	garage: Arc<Garage>,
 	req: Request<Body>,
 	bucket_id: Uuid,
 	key: &str,
-	content_sha256: Option<Hash>,
+	api_key: &Key,
+	mut content_sha256: Option<Hash>,
 ) -> Result<Response<Body>, Error> {
 	// Generate identity of new version
 	let version_uuid = gen_uuid();
@@ -40,11 +46,53 @@ pub async fn handle_put(
 		Some(x) => Some(x.to_str()?.to_string()),
 		None => None,
 	};
+	let payload_seed_signature = match req.headers().get("x-amz-content-sha256") {
+		Some(header) if header == "STREAMING-AWS4-HMAC-SHA256-PAYLOAD" => {
+			let content_sha256 = content_sha256
+				.take()
+				.ok_or_bad_request("No signature provided")?;
+			Some(content_sha256)
+		}
+		_ => None,
+	};
 
 	// Parse body of uploaded file
-	let body = req.into_body();
+	let (head, body) = req.into_parts();
+	let body = body.map_err(Error::from);
 
-	let mut chunker = BodyChunker::new(body, garage.config.block_size);
+	let body = if let Some(signature) = payload_seed_signature {
+		let secret_key = &api_key
+			.state
+			.as_option()
+			.ok_or_internal_error("Deleted key state")?
+			.secret_key;
+
+		let date = head
+			.headers
+			.get("x-amz-date")
+			.ok_or_bad_request("Missing X-Amz-Date field")?
+			.to_str()?;
+		let date: NaiveDateTime =
+			NaiveDateTime::parse_from_str(date, LONG_DATETIME).ok_or_bad_request("Invalid date")?;
+		let date: DateTime<Utc> = DateTime::from_utc(date, Utc);
+
+		let scope = compute_scope(&date, &garage.config.s3_api.s3_region);
+		let signing_hmac = crate::signature::signing_hmac(
+			&date,
+			secret_key,
+			&garage.config.s3_api.s3_region,
+			"s3",
+		)
+		.ok_or_internal_error("Unable to build signing HMAC")?;
+
+		SignedPayloadStream::new(body, signing_hmac, date, &scope, signature)?
+			.map_err(Error::from)
+			.boxed()
+	} else {
+		body.boxed()
+	};
+
+	let mut chunker = StreamChunker::new(body, garage.config.block_size);
 	let first_block = chunker.next().await?.unwrap_or_default();
 
 	// If body is small enough, store it directly in the object table
@@ -178,13 +226,13 @@ fn ensure_checksum_matches(
 	Ok(())
 }
 
-async fn read_and_put_blocks(
+async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	garage: &Garage,
 	version: &Version,
 	part_number: u64,
 	first_block: Vec<u8>,
 	first_block_hash: Hash,
-	chunker: &mut BodyChunker,
+	chunker: &mut StreamChunker<S>,
 ) -> Result<(u64, GenericArray<u8, typenum::U16>, Hash), Error> {
 	let mut md5hasher = Md5::new();
 	let mut sha256hasher = Sha256::new();
@@ -205,8 +253,11 @@ async fn read_and_put_blocks(
 		.rpc_put_block(first_block_hash, first_block);
 
 	loop {
-		let (_, _, next_block) =
+		let (_, _, next_block) = futures::try_join!(
-			futures::try_join!(put_curr_block, put_curr_version_block, chunker.next())?;
+			put_curr_block.map_err(Error::from),
+			put_curr_version_block.map_err(Error::from),
+			chunker.next(),
+		)?;
 		if let Some(block) = next_block {
 			md5hasher.update(&block[..]);
 			sha256hasher.update(&block[..]);
@@ -266,32 +317,34 @@ async fn put_block_meta(
 	Ok(())
 }
 
-struct BodyChunker {
+struct StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
-	body: Body,
+	stream: S,
 	read_all: bool,
 	block_size: usize,
 	buf: VecDeque<u8>,
 }
 
-impl BodyChunker {
+impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
-	fn new(body: Body, block_size: usize) -> Self {
+	fn new(stream: S, block_size: usize) -> Self {
 		Self {
-			body,
+			stream,
 			read_all: false,
 			block_size,
 			buf: VecDeque::with_capacity(2 * block_size),
 		}
 	}
-	async fn next(&mut self) -> Result<Option<Vec<u8>>, GarageError> {
+
+	async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
 		while !self.read_all && self.buf.len() < self.block_size {
-			if let Some(block) = self.body.next().await {
+			if let Some(block) = self.stream.next().await {
 				let bytes = block?;
 				trace!("Body next: {} bytes", bytes.len());
-				self.buf.extend(&bytes[..]);
+				self.buf.extend(bytes);
 			} else {
 				self.read_all = true;
 			}
 		}
+
 		if self.buf.is_empty() {
 			Ok(None)
 		} else if self.buf.len() <= self.block_size {
@@ -368,12 +421,20 @@ pub async fn handle_put_part(
 
 	// Read first chuck, and at the same time try to get object to see if it exists
 	let key = key.to_string();
-	let mut chunker = BodyChunker::new(req.into_body(), garage.config.block_size);
+
+	let body = req.into_body().map_err(Error::from);
+	let mut chunker = StreamChunker::new(body, garage.config.block_size);
 
 	let (object, version, first_block) = futures::try_join!(
-		garage.object_table.get(&bucket_id, &key),
+		garage
-		garage.version_table.get(&version_uuid, &EmptyKey),
+			.object_table
-		chunker.next()
+			.get(&bucket_id, &key)
+			.map_err(Error::from),
+		garage
+			.version_table
+			.get(&version_uuid, &EmptyKey)
+			.map_err(Error::from),
+		chunker.next(),
 	)?;
 
 	// Check object is valid and multipart block can be accepted
@@ -444,7 +505,10 @@ pub async fn handle_complete_multipart_upload(
 	content_sha256: Option<Hash>,
 ) -> Result<Response<Body>, Error> {
 	let body = hyper::body::to_bytes(req.into_body()).await?;
-	verify_signed_content(content_sha256, &body[..])?;
+
+	if let Some(content_sha256) = content_sha256 {
+		verify_signed_content(content_sha256, &body[..])?;
+	}
 
 	let body_xml = roxmltree::Document::parse(std::str::from_utf8(&body)?)?;
 	let body_list_of_parts = parse_complete_multpart_upload_body(&body_xml)

src/api/s3_website.rs

@@ -80,7 +80,10 @@ pub async fn handle_put_website(
 	content_sha256: Option<Hash>,
 ) -> Result<Response<Body>, Error> {
 	let body = hyper::body::to_bytes(req.into_body()).await?;
-	verify_signed_content(content_sha256, &body[..])?;
+
+	if let Some(content_sha256) = content_sha256 {
+		verify_signed_content(content_sha256, &body[..])?;
+	}
 
 	let mut bucket = garage
 		.bucket_table

src/api/signature/mod.rs

@@ -0,0 +1,47 @@
+use chrono::{DateTime, Utc};
+use hmac::{Hmac, Mac, NewMac};
+use sha2::Sha256;
+
+use garage_util::data::{sha256sum, Hash};
+
+use crate::error::*;
+
+pub mod payload;
+pub mod streaming;
+
+pub const SHORT_DATE: &str = "%Y%m%d";
+pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
+
+type HmacSha256 = Hmac<Sha256>;
+
+pub fn verify_signed_content(expected_sha256: Hash, body: &[u8]) -> Result<(), Error> {
+	if expected_sha256 != sha256sum(body) {
+		return Err(Error::BadRequest(
+			"Request content hash does not match signed hash".to_string(),
+		));
+	}
+	Ok(())
+}
+
+pub fn signing_hmac(
+	datetime: &DateTime<Utc>,
+	secret_key: &str,
+	region: &str,
+	service: &str,
+) -> Result<HmacSha256, crypto_mac::InvalidKeyLength> {
+	let secret = String::from("AWS4") + secret_key;
+	let mut date_hmac = HmacSha256::new_varkey(secret.as_bytes())?;
+	date_hmac.update(datetime.format(SHORT_DATE).to_string().as_bytes());
+	let mut region_hmac = HmacSha256::new_varkey(&date_hmac.finalize().into_bytes())?;
+	region_hmac.update(region.as_bytes());
+	let mut service_hmac = HmacSha256::new_varkey(&region_hmac.finalize().into_bytes())?;
+	service_hmac.update(service.as_bytes());
+	let mut signing_hmac = HmacSha256::new_varkey(&service_hmac.finalize().into_bytes())?;
+	signing_hmac.update(b"aws4_request");
+	let hmac = HmacSha256::new_varkey(&signing_hmac.finalize().into_bytes())?;
+	Ok(hmac)
+}
+
+pub fn compute_scope(datetime: &DateTime<Utc>, region: &str) -> String {
+	format!("{}/{}/s3/aws4_request", datetime.format(SHORT_DATE), region,)
+}

src/api/signature/payload.rs

@@ -1,25 +1,23 @@
 use std::collections::HashMap;
 
 use chrono::{DateTime, Duration, NaiveDateTime, Utc};
-use hmac::{Hmac, Mac, NewMac};
+use hmac::Mac;
 use hyper::{Body, Method, Request};
 use sha2::{Digest, Sha256};
 
 use garage_table::*;
-use garage_util::data::{sha256sum, Hash};
+use garage_util::data::Hash;
 
 use garage_model::garage::Garage;
 use garage_model::key_table::*;
 
+use super::signing_hmac;
+use super::{LONG_DATETIME, SHORT_DATE};
+
 use crate::encoding::uri_encode;
 use crate::error::*;
 
-const SHORT_DATE: &str = "%Y%m%d";
+pub async fn check_payload_signature(
-const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
-
-type HmacSha256 = Hmac<Sha256>;
-
-pub async fn check_signature(
 	garage: &Garage,
 	request: &Request<Body>,
 ) -> Result<(Key, Option<Hash>), Error> {
@@ -97,13 +95,13 @@ pub async fn check_signature(
 
 	let content_sha256 = if authorization.content_sha256 == "UNSIGNED-PAYLOAD" {
 		None
+	} else if authorization.content_sha256 == "STREAMING-AWS4-HMAC-SHA256-PAYLOAD" {
+		let bytes = hex::decode(authorization.signature).ok_or_bad_request("Invalid signature")?;
+		Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid signature")?)
 	} else {
 		let bytes = hex::decode(authorization.content_sha256)
 			.ok_or_bad_request("Invalid content sha256 hash")?;
-		Some(
+		Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid content sha256 hash")?)
-			Hash::try_from(&bytes[..])
-				.ok_or_else(|| Error::BadRequest("Invalid content sha256 hash".to_string()))?,
-		)
 	};
 
 	Ok((key, content_sha256))
@@ -222,25 +220,6 @@ fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_req: &
 	.join("\n")
 }
 
-fn signing_hmac(
-	datetime: &DateTime<Utc>,
-	secret_key: &str,
-	region: &str,
-	service: &str,
-) -> Result<HmacSha256, crypto_mac::InvalidKeyLength> {
-	let secret = String::from("AWS4") + secret_key;
-	let mut date_hmac = HmacSha256::new_varkey(secret.as_bytes())?;
-	date_hmac.update(datetime.format(SHORT_DATE).to_string().as_bytes());
-	let mut region_hmac = HmacSha256::new_varkey(&date_hmac.finalize().into_bytes())?;
-	region_hmac.update(region.as_bytes());
-	let mut service_hmac = HmacSha256::new_varkey(&region_hmac.finalize().into_bytes())?;
-	service_hmac.update(service.as_bytes());
-	let mut signing_hmac = HmacSha256::new_varkey(&service_hmac.finalize().into_bytes())?;
-	signing_hmac.update(b"aws4_request");
-	let hmac = HmacSha256::new_varkey(&signing_hmac.finalize().into_bytes())?;
-	Ok(hmac)
-}
-
 fn canonical_request(
 	method: &Method,
 	url_path: &str,
@@ -288,14 +267,3 @@ fn canonical_query_string(uri: &hyper::Uri) -> String {
 		"".to_string()
 	}
 }
-
-pub fn verify_signed_content(content_sha256: Option<Hash>, body: &[u8]) -> Result<(), Error> {
-	let expected_sha256 =
-		content_sha256.ok_or_bad_request("Request content hash not signed, aborting.")?;
-	if expected_sha256 != sha256sum(body) {
-		return Err(Error::BadRequest(
-			"Request content hash does not match signed hash".to_string(),
-		));
-	}
-	Ok(())
-}

src/api/signature/streaming.rs

@@ -0,0 +1,319 @@
+use std::pin::Pin;
+
+use chrono::{DateTime, Utc};
+use futures::prelude::*;
+use futures::task;
+use hyper::body::Bytes;
+
+use garage_util::data::Hash;
+use hmac::Mac;
+
+use super::sha256sum;
+use super::HmacSha256;
+use super::LONG_DATETIME;
+
+use crate::error::*;
+
+/// Result of `sha256("")`
+const EMPTY_STRING_HEX_DIGEST: &str =
+	"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
+
+fn compute_streaming_payload_signature(
+	signing_hmac: &HmacSha256,
+	date: DateTime<Utc>,
+	scope: &str,
+	previous_signature: Hash,
+	content_sha256: Hash,
+) -> Result<Hash, Error> {
+	let string_to_sign = [
+		"AWS4-HMAC-SHA256-PAYLOAD",
+		&date.format(LONG_DATETIME).to_string(),
+		scope,
+		&hex::encode(previous_signature),
+		EMPTY_STRING_HEX_DIGEST,
+		&hex::encode(content_sha256),
+	]
+	.join("\n");
+
+	let mut hmac = signing_hmac.clone();
+	hmac.update(string_to_sign.as_bytes());
+
+	Hash::try_from(&hmac.finalize().into_bytes()).ok_or_internal_error("Invalid signature")
+}
+
+mod payload {
+	use garage_util::data::Hash;
+
+	pub enum Error<I> {
+		Parser(nom::error::Error<I>),
+		BadSignature,
+	}
+
+	impl<I> Error<I> {
+		pub fn description(&self) -> &str {
+			match *self {
+				Error::Parser(ref e) => e.code.description(),
+				Error::BadSignature => "Bad signature",
+			}
+		}
+	}
+
+	#[derive(Debug, Clone)]
+	pub struct Header {
+		pub size: usize,
+		pub signature: Hash,
+	}
+
+	impl Header {
+		pub fn parse(input: &[u8]) -> nom::IResult<&[u8], Self, Error<&[u8]>> {
+			use nom::bytes::streaming::tag;
+			use nom::character::streaming::hex_digit1;
+			use nom::combinator::map_res;
+			use nom::number::streaming::hex_u32;
+
+			macro_rules! try_parse {
+				($expr:expr) => {
+					$expr.map_err(|e| e.map(Error::Parser))?
+				};
+			}
+
+			let (input, size) = try_parse!(hex_u32(input));
+			let (input, _) = try_parse!(tag(";")(input));
+
+			let (input, _) = try_parse!(tag("chunk-signature=")(input));
+			let (input, data) = try_parse!(map_res(hex_digit1, hex::decode)(input));
+			let signature = Hash::try_from(&data).ok_or(nom::Err::Failure(Error::BadSignature))?;
+
+			let (input, _) = try_parse!(tag("\r\n")(input));
+
+			let header = Header {
+				size: size as usize,
+				signature,
+			};
+
+			Ok((input, header))
+		}
+	}
+}
+
+#[derive(Debug)]
+pub enum SignedPayloadStreamError {
+	Stream(Error),
+	InvalidSignature,
+	Message(String),
+}
+
+impl SignedPayloadStreamError {
+	fn message(msg: &str) -> Self {
+		SignedPayloadStreamError::Message(msg.into())
+	}
+}
+
+impl From<SignedPayloadStreamError> for Error {
+	fn from(err: SignedPayloadStreamError) -> Self {
+		match err {
+			SignedPayloadStreamError::Stream(e) => e,
+			SignedPayloadStreamError::InvalidSignature => {
+				Error::BadRequest("Invalid payload signature".into())
+			}
+			SignedPayloadStreamError::Message(e) => {
+				Error::BadRequest(format!("Chunk format error: {}", e))
+			}
+		}
+	}
+}
+
+impl<I> From<payload::Error<I>> for SignedPayloadStreamError {
+	fn from(err: payload::Error<I>) -> Self {
+		Self::message(err.description())
+	}
+}
+
+impl<I> From<nom::error::Error<I>> for SignedPayloadStreamError {
+	fn from(err: nom::error::Error<I>) -> Self {
+		Self::message(err.code.description())
+	}
+}
+
+struct SignedPayload {
+	header: payload::Header,
+	data: Bytes,
+}
+
+#[pin_project::pin_project]
+pub struct SignedPayloadStream<S>
+where
+	S: Stream<Item = Result<Bytes, Error>>,
+{
+	#[pin]
+	stream: S,
+	buf: bytes::BytesMut,
+	datetime: DateTime<Utc>,
+	scope: String,
+	signing_hmac: HmacSha256,
+	previous_signature: Hash,
+}
+
+impl<S> SignedPayloadStream<S>
+where
+	S: Stream<Item = Result<Bytes, Error>>,
+{
+	pub fn new(
+		stream: S,
+		signing_hmac: HmacSha256,
+		datetime: DateTime<Utc>,
+		scope: &str,
+		seed_signature: Hash,
+	) -> Result<Self, Error> {
+		Ok(Self {
+			stream,
+			buf: bytes::BytesMut::new(),
+			datetime,
+			scope: scope.into(),
+			signing_hmac,
+			previous_signature: seed_signature,
+		})
+	}
+
+	fn parse_next(input: &[u8]) -> nom::IResult<&[u8], SignedPayload, SignedPayloadStreamError> {
+		use nom::bytes::streaming::{tag, take};
+
+		macro_rules! try_parse {
+			($expr:expr) => {
+				$expr.map_err(nom::Err::convert)?
+			};
+		}
+
+		let (input, header) = try_parse!(payload::Header::parse(input));
+
+		// 0-sized chunk is the last
+		if header.size == 0 {
+			return Ok((
+				input,
+				SignedPayload {
+					header,
+					data: Bytes::new(),
+				},
+			));
+		}
+
+		let (input, data) = try_parse!(take::<_, _, nom::error::Error<_>>(header.size)(input));
+		let (input, _) = try_parse!(tag::<_, _, nom::error::Error<_>>("\r\n")(input));
+
+		let data = Bytes::from(data.to_vec());
+
+		Ok((input, SignedPayload { header, data }))
+	}
+}
+
+impl<S> Stream for SignedPayloadStream<S>
+where
+	S: Stream<Item = Result<Bytes, Error>> + Unpin,
+{
+	type Item = Result<Bytes, SignedPayloadStreamError>;
+
+	fn poll_next(
+		self: Pin<&mut Self>,
+		cx: &mut task::Context<'_>,
+	) -> task::Poll<Option<Self::Item>> {
+		use std::task::Poll;
+
+		let mut this = self.project();
+
+		loop {
+			let (input, payload) = match Self::parse_next(this.buf) {
+				Ok(res) => res,
+				Err(nom::Err::Incomplete(_)) => {
+					match futures::ready!(this.stream.as_mut().poll_next(cx)) {
+						Some(Ok(bytes)) => {
+							this.buf.extend(bytes);
+							continue;
+						}
+						Some(Err(e)) => {
+							return Poll::Ready(Some(Err(SignedPayloadStreamError::Stream(e))))
+						}
+						None => {
+							return Poll::Ready(Some(Err(SignedPayloadStreamError::message(
+								"Unexpected EOF",
+							))));
+						}
+					}
+				}
+				Err(nom::Err::Error(e)) | Err(nom::Err::Failure(e)) => {
+					return Poll::Ready(Some(Err(e)))
+				}
+			};
+
+			// 0-sized chunk is the last
+			if payload.data.is_empty() {
+				return Poll::Ready(None);
+			}
+
+			let data_sha256sum = sha256sum(&payload.data);
+
+			let expected_signature = compute_streaming_payload_signature(
+				this.signing_hmac,
+				*this.datetime,
+				this.scope,
+				*this.previous_signature,
+				data_sha256sum,
+			)
+			.map_err(|e| {
+				SignedPayloadStreamError::Message(format!("Could not build signature: {}", e))
+			})?;
+
+			if payload.header.signature != expected_signature {
+				return Poll::Ready(Some(Err(SignedPayloadStreamError::InvalidSignature)));
+			}
+
+			*this.buf = input.into();
+			*this.previous_signature = payload.header.signature;
+
+			return Poll::Ready(Some(Ok(payload.data)));
+		}
+	}
+
+	fn size_hint(&self) -> (usize, Option<usize>) {
+		self.stream.size_hint()
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use futures::prelude::*;
+
+	use super::{SignedPayloadStream, SignedPayloadStreamError};
+
+	#[tokio::test]
+	async fn test_interrupted_signed_payload_stream() {
+		use chrono::{DateTime, Utc};
+
+		use garage_util::data::Hash;
+
+		let datetime = DateTime::parse_from_rfc3339("2021-12-13T13:12:42+01:00") // TODO UNIX 0
+			.unwrap()
+			.with_timezone(&Utc);
+		let secret_key = "test";
+		let region = "test";
+		let scope = crate::signature::compute_scope(&datetime, region);
+		let signing_hmac =
+			crate::signature::signing_hmac(&datetime, secret_key, region, "s3").unwrap();
+
+		let data: &[&[u8]] = &[b"1"];
+		let body = futures::stream::iter(data.iter().map(|block| Ok(block.as_ref().into())));
+
+		let seed_signature = Hash::default();
+
+		let mut stream =
+			SignedPayloadStream::new(body, signing_hmac, datetime, &scope, seed_signature).unwrap();
+
+		assert!(stream.try_next().await.is_err());
+		match stream.try_next().await {
+			Err(SignedPayloadStreamError::Message(msg)) if msg == "Unexpected EOF" => {}
+			item => panic!(
+				"Unexpected result, expected early EOF error, got {:?}",
+				item
+			),
+		}
+	}
+}