Starting to be S3 compatible

This commit is contained in:
Alex Auvolat 2020-04-24 17:46:52 +00:00
parent d8f5e643bc
commit f2e05986c4
8 changed files with 543 additions and 38 deletions

111
Cargo.lock generated
View file

@ -106,6 +106,16 @@ name = "cfg-if"
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@ -156,6 +166,15 @@ dependencies = [
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@ -342,16 +361,22 @@ name = "garage_api"
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@ -512,6 +537,15 @@ name = "hex"
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@ -536,6 +570,11 @@ name = "httparse"
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@ -582,6 +621,16 @@ dependencies = [
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@ -646,6 +695,11 @@ dependencies = [
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@ -713,6 +767,15 @@ dependencies = [
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@ -757,6 +820,11 @@ dependencies = [
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@ -1094,6 +1162,11 @@ dependencies = [
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[[package]]
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@ -1237,6 +1310,22 @@ name = "typenum"
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@ -1257,6 +1346,16 @@ name = "untrusted"
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3
TODO
View file

@ -8,11 +8,10 @@ We will have to introduce lots of dummy data and then add/remove nodes many time
Attaining S3 compatibility
--------------------------
- table for access keys
- S3 request signature verification
- api_server following the S3 semantics for get/put/delete
- implement object listing
- possibly other necessary endpoints ?
- PUT requests: verify content-md5 if provided
Lower priority

View file

@ -17,6 +17,10 @@ garage_core = { path = "../core" }
bytes = "0.4"
hex = "0.3"
log = "0.4"
chrono = "0.4"
sha2 = "0.8"
hmac = "0.7"
crypto-mac = "0.7"
futures = "0.3"
futures-util = "0.3"
@ -24,5 +28,7 @@ tokio = { version = "0.2", default-features = false, features = ["rt-core", "rt-
http = "0.2"
hyper = "0.13"
url = "2.1"
httpdate = "0.3"

View file

@ -1,6 +1,7 @@
use std::collections::VecDeque;
use std::net::SocketAddr;
use std::sync::Arc;
use std::time::{Duration, UNIX_EPOCH};
use futures::future::Future;
use futures::stream::*;
@ -21,6 +22,7 @@ use garage_core::object_table::*;
use garage_core::version_table::*;
use crate::http_util::*;
use crate::signature::check_signature;
type BodyType = Box<dyn HttpBody<Data = Bytes, Error = Error> + Send + Unpin>;
@ -28,7 +30,7 @@ pub async fn run_api_server(
garage: Arc<Garage>,
shutdown_signal: impl Future<Output = ()>,
) -> Result<(), Error> {
let addr = &garage.config.api_bind_addr;
let addr = &garage.config.s3_api.api_bind_addr;
let service = make_service_fn(|conn: &AddrStream| {
let garage = garage.clone();
@ -55,12 +57,18 @@ async fn handler(
req: Request<Body>,
addr: SocketAddr,
) -> Result<Response<BodyType>, Error> {
match handler_inner(garage, req, addr).await {
Ok(x) => Ok(x),
info!("{} {} {}", addr, req.method(), req.uri());
debug!("{:?}", req);
match handler_inner(garage, req).await {
Ok(x) => {
debug!("{} {:?}", x.status(), x.headers());
Ok(x)
}
Err(e) => {
let body: BodyType = Box::new(BytesBody::from(format!("{}\n", e)));
let mut http_error = Response::new(body);
*http_error.status_mut() = e.http_status_code();
warn!("Response: error {}, {}", e.http_status_code(), e);
Ok(http_error)
}
}
@ -69,19 +77,36 @@ async fn handler(
async fn handler_inner(
garage: Arc<Garage>,
req: Request<Body>,
addr: SocketAddr,
) -> Result<Response<BodyType>, Error> {
info!("{} {} {}", addr, req.method(), req.uri());
let path = req.uri().path().to_string();
let path = path.trim_start_matches('/');
let (bucket, key) = match path.find('/') {
Some(i) => {
let (bucket, key) = path.split_at(i);
(bucket, Some(key))
}
None => (path, None),
};
if bucket.len() == 0 {
return Err(Error::Forbidden(format!(
"Operations on buckets not allowed"
)));
}
let bucket = req
.headers()
.get(hyper::header::HOST)
.map(|x| x.to_str().map_err(Error::from))
.unwrap_or(Err(Error::BadRequest(format!("Host: header missing"))))?
.to_lowercase();
let key = req.uri().path().to_string();
let api_key = check_signature(&garage, &req).await?;
let allowed = match req.method() {
&Method::HEAD | &Method::GET => api_key.allow_read(&bucket),
_ => api_key.allow_write(&bucket),
};
if !allowed {
return Err(Error::Forbidden(format!(
"Operation is not allowed for this key."
)));
}
if let Some(key) = key {
match req.method() {
&Method::HEAD => Ok(handle_head(garage, &bucket, &key).await?),
&Method::GET => Ok(handle_get(garage, &bucket, &key).await?),
&Method::PUT => {
let mime_type = req
@ -102,6 +127,10 @@ async fn handler_inner(
}
_ => Err(Error::BadRequest(format!("Invalid method"))),
}
} else {
// TODO: listing buckets
Err(Error::Forbidden("Unimplemented".into()))
}
}
async fn handle_put(
@ -280,6 +309,49 @@ async fn handle_delete(garage: Arc<Garage>, bucket: &str, key: &str) -> Result<U
return Ok(version_uuid);
}
fn object_headers(version: &ObjectVersion) -> http::response::Builder {
let date = UNIX_EPOCH + Duration::from_millis(version.timestamp);
let date_str = httpdate::fmt_http_date(date);
Response::builder()
.header("Content-Type", version.mime_type.to_string())
.header("Content-Length", format!("{}", version.size))
.header("Last-Modified", date_str)
}
async fn handle_head(
garage: Arc<Garage>,
bucket: &str,
key: &str,
) -> Result<Response<BodyType>, Error> {
let object = match garage
.object_table
.get(&bucket.to_string(), &key.to_string())
.await?
{
None => return Err(Error::NotFound),
Some(o) => o,
};
let version = match object
.versions()
.iter()
.rev()
.filter(|v| v.is_complete && v.data != ObjectVersionData::DeleteMarker)
.next()
{
Some(v) => v,
None => return Err(Error::NotFound),
};
let body: BodyType = Box::new(BytesBody::from(vec![]));
let response = object_headers(&version)
.status(StatusCode::OK)
.body(body)
.unwrap();
Ok(response)
}
async fn handle_get(
garage: Arc<Garage>,
bucket: &str,
@ -305,9 +377,7 @@ async fn handle_get(
None => return Err(Error::NotFound),
};
let resp_builder = Response::builder()
.header("Content-Type", last_v.mime_type.to_string())
.status(StatusCode::OK);
let resp_builder = object_headers(&last_v).status(StatusCode::OK);
match &last_v.data {
ObjectVersionData::DeleteMarker => Err(Error::NotFound),

View file

@ -3,3 +3,4 @@ extern crate log;
pub mod api_server;
pub mod http_util;
pub mod signature;

307
src/api/signature.rs Normal file
View file

@ -0,0 +1,307 @@
use std::collections::HashMap;
use chrono::{DateTime, Duration, NaiveDateTime, Utc};
use hmac::{Hmac, Mac};
use hyper::{Body, Method, Request};
use sha2::{Digest, Sha256};
use garage_table::*;
use garage_util::error::Error;
use garage_core::garage::Garage;
use garage_core::key_table::*;
const SHORT_DATE: &str = "%Y%m%d";
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, Error> {
let mut headers = HashMap::new();
for (key, val) in request.headers() {
headers.insert(key.to_string(), val.to_str()?.to_string());
}
if let Some(query) = request.uri().query() {
let query_pairs = url::form_urlencoded::parse(query.as_bytes());
for (key, val) in query_pairs {
headers.insert(key.to_lowercase(), val.to_string());
}
}
let authorization = if let Some(authorization) = headers.get("authorization") {
parse_authorization(authorization, &headers)?
} else {
parse_query_authorization(&headers)?
};
let date = headers
.get("x-amz-date")
.ok_or(Error::BadRequest("Missing X-Amz-Date field".into()))?;
let date: NaiveDateTime = NaiveDateTime::parse_from_str(date, LONG_DATETIME)
.map_err(|e| Error::BadRequest(format!("Invalid date: {}", e)))?
.into();
let date: DateTime<Utc> = DateTime::from_utc(date, Utc);
if Utc::now() - date > Duration::hours(24) {
return Err(Error::BadRequest(format!("Date is too old")));
}
let scope = format!(
"{}/{}/s3/aws4_request",
date.format(SHORT_DATE),
garage.config.s3_api.s3_region
);
if authorization.scope != scope {
return Err(Error::BadRequest(format!(
"Invalid scope in authorization field, expected: {}",
scope
)));
}
let key = garage
.key_table
.get(&EmptyKey, &authorization.key_id)
.await?
.filter(|k| !k.deleted)
.ok_or(Error::Forbidden(format!(
"No such key: {}",
authorization.key_id
)))?;
let canonical_request = canonical_request(
request.method(),
&request.uri().path().to_string(),
&canonical_query_string(&request.uri()),
&headers,
&authorization.signed_headers,
&authorization.content_sha256,
);
let string_to_sign = string_to_sign(&date, &scope, &canonical_request);
let mut hmac = signing_hmac(
&date,
&key.secret_key,
&garage.config.s3_api.s3_region,
"s3",
)
.map_err(|e| Error::Message(format!("Unable to build signing HMAC: {}", e)))?;
hmac.input(string_to_sign.as_bytes());
let signature = hex::encode(hmac.result().code());
if authorization.signature != signature {
return Err(Error::Forbidden(format!("Invalid signature")));
}
Ok(key)
}
struct Authorization {
key_id: String,
scope: String,
signed_headers: String,
signature: String,
content_sha256: String,
}
fn parse_authorization(
authorization: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
let first_space = authorization
.find(' ')
.ok_or(Error::BadRequest("Authorization field too short".into()))?;
let (auth_kind, rest) = authorization.split_at(first_space);
if auth_kind != "AWS4-HMAC-SHA256" {
return Err(Error::BadRequest("Unsupported authorization method".into()));
}
let mut auth_params = HashMap::new();
for auth_part in rest.split(',') {
let auth_part = auth_part.trim();
let eq = auth_part.find('=').ok_or(Error::BadRequest(format!(
"Missing =value in authorization field {}",
auth_part
)))?;
let (key, value) = auth_part.split_at(eq);
auth_params.insert(key.to_string(), value.trim_start_matches('=').to_string());
}
let cred = auth_params
.get("Credential")
.ok_or(Error::BadRequest(format!(
"Could not find Credential in Authorization field"
)))?;
let (key_id, scope) = parse_credential(cred)?;
let content_sha256 = headers
.get("x-amz-content-sha256")
.ok_or(Error::BadRequest(
"Missing X-Amz-Content-Sha256 field".into(),
))?;
let auth = Authorization {
key_id,
scope,
signed_headers: auth_params
.get("SignedHeaders")
.ok_or(Error::BadRequest(format!(
"Could not find SignedHeaders in Authorization field"
)))?
.to_string(),
signature: auth_params
.get("Signature")
.ok_or(Error::BadRequest(format!(
"Could not find Signature in Authorization field"
)))?
.to_string(),
content_sha256: content_sha256.to_string(),
};
Ok(auth)
}
fn parse_query_authorization(headers: &HashMap<String, String>) -> Result<Authorization, Error> {
let algo = headers
.get("x-amz-algorithm")
.ok_or(Error::BadRequest(format!(
"X-Amz-Algorithm not found in query parameters"
)))?;
if algo != "AWS4-HMAC-SHA256" {
return Err(Error::BadRequest(format!(
"Unsupported authorization method"
)));
}
let cred = headers
.get("x-amz-credential")
.ok_or(Error::BadRequest(format!(
"X-Amz-Credential not found in query parameters"
)))?;
let (key_id, scope) = parse_credential(cred)?;
let signed_headers = headers
.get("x-amz-signedheaders")
.ok_or(Error::BadRequest(format!(
"X-Amz-SignedHeaders not found in query parameters"
)))?;
let signature = headers
.get("x-amz-signature")
.ok_or(Error::BadRequest(format!(
"X-Amz-Signature not found in query parameters"
)))?;
Ok(Authorization {
key_id,
scope,
signed_headers: signed_headers.to_string(),
signature: signature.to_string(),
content_sha256: "UNSIGNED-PAYLOAD".to_string(),
})
}
fn parse_credential(cred: &str) -> Result<(String, String), Error> {
let first_slash = cred.find('/').ok_or(Error::BadRequest(format!(
"Credentials does not contain / in authorization field"
)))?;
let (key_id, scope) = cred.split_at(first_slash);
Ok((
key_id.to_string(),
scope.trim_start_matches('/').to_string(),
))
}
fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_req: &str) -> String {
let mut hasher = Sha256::default();
hasher.input(canonical_req.as_bytes());
[
"AWS4-HMAC-SHA256",
&datetime.format(LONG_DATETIME).to_string(),
scope_string,
&hex::encode(hasher.result().as_slice()),
]
.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.input(datetime.format(SHORT_DATE).to_string().as_bytes());
let mut region_hmac = HmacSha256::new_varkey(&date_hmac.result().code())?;
region_hmac.input(region.as_bytes());
let mut service_hmac = HmacSha256::new_varkey(&region_hmac.result().code())?;
service_hmac.input(service.as_bytes());
let mut signing_hmac = HmacSha256::new_varkey(&service_hmac.result().code())?;
signing_hmac.input(b"aws4_request");
let hmac = HmacSha256::new_varkey(&signing_hmac.result().code())?;
Ok(hmac)
}
fn canonical_request(
method: &Method,
url_path: &str,
canonical_query_string: &str,
headers: &HashMap<String, String>,
signed_headers: &str,
content_sha256: &str,
) -> String {
[
method.as_str(),
url_path,
canonical_query_string,
&canonical_header_string(&headers, signed_headers),
"",
signed_headers,
content_sha256,
]
.join("\n")
}
fn canonical_header_string(headers: &HashMap<String, String>, signed_headers: &str) -> String {
let signed_headers_vec = signed_headers.split(';').collect::<Vec<_>>();
let mut items = headers
.iter()
.filter(|(key, _)| signed_headers_vec.contains(&key.as_str()))
.map(|(key, value)| key.to_lowercase() + ":" + value.trim())
.collect::<Vec<_>>();
items.sort();
items.join("\n")
}
fn canonical_query_string(uri: &hyper::Uri) -> String {
if let Some(query) = uri.query() {
let query_pairs = url::form_urlencoded::parse(query.as_bytes());
let mut items = query_pairs
.filter(|(key, _)| key != "X-Amz-Signature")
.map(|(key, value)| uri_encode(&key, true) + "=" + &uri_encode(&value, true))
.collect::<Vec<_>>();
items.sort();
items.join("&")
} else {
"".to_string()
}
}
fn uri_encode(string: &str, encode_slash: bool) -> String {
let mut result = String::with_capacity(string.len() * 2);
for c in string.chars() {
match c {
'a'..='z' | 'A'..='Z' | '0'..='9' | '_' | '-' | '~' | '.' => result.push(c),
'/' if encode_slash => result.push_str("%2F"),
'/' if !encode_slash => result.push('/'),
_ => {
result.push('%');
result.push_str(
&format!("{}", c)
.bytes()
.map(|b| format!("{:02X}", b))
.collect::<String>(),
);
}
}
}
result
}

View file

@ -11,7 +11,6 @@ pub struct Config {
pub metadata_dir: PathBuf,
pub data_dir: PathBuf,
pub api_bind_addr: SocketAddr,
pub rpc_bind_addr: SocketAddr,
pub bootstrap_peers: Vec<SocketAddr>,
@ -32,6 +31,8 @@ pub struct Config {
pub data_replication_factor: usize,
pub rpc_tls: Option<TlsConfig>,
pub s3_api: ApiConfig,
}
#[derive(Deserialize, Debug, Clone)]
@ -41,6 +42,12 @@ pub struct TlsConfig {
pub node_key: String,
}
#[derive(Deserialize, Debug, Clone)]
pub struct ApiConfig {
pub api_bind_addr: SocketAddr,
pub s3_region: String,
}
fn default_max_concurrent_rpc_requests() -> usize {
12
}

View file

@ -69,6 +69,9 @@ pub enum Error {
#[error(display = "Bad request: {}", _0)]
BadRequest(String),
#[error(display = "Forbidden: {}", _0)]
Forbidden(String),
#[error(display = "Not found")]
NotFound,
@ -84,6 +87,7 @@ impl Error {
match self {
Error::BadRequest(_) => StatusCode::BAD_REQUEST,
Error::NotFound => StatusCode::NOT_FOUND,
Error::Forbidden(_) => StatusCode::FORBIDDEN,
Error::RPC(_) => StatusCode::SERVICE_UNAVAILABLE,
_ => StatusCode::INTERNAL_SERVER_ERROR,
}