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use chrono::{DateTime, Utc};
use hmac::{Hmac, Mac};
use sha2::Sha256;
use hyper::{body::Body, Request};
use garage_model::garage::Garage;
use garage_model::key_table::Key;
use garage_util::data::{sha256sum, Hash};
pub mod error;
pub mod payload;
pub mod streaming;
use error::*;
pub const SHORT_DATE: &str = "%Y%m%d";
pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
type HmacSha256 = Hmac<Sha256>;
pub async fn verify_request(
garage: &Garage,
mut req: Request<Body>,
service: &'static str,
) -> Result<(Request<Body>, Key, Option<Hash>), Error> {
let (api_key, mut content_sha256) =
payload::check_payload_signature(&garage, &mut req, service).await?;
let api_key =
api_key.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?;
let req = streaming::parse_streaming_body(
&api_key,
req,
&mut content_sha256,
&garage.config.s3_api.s3_region,
service,
)?;
Ok((req, api_key, content_sha256))
}
pub fn verify_signed_content(expected_sha256: Hash, body: &[u8]) -> Result<(), Error> {
if expected_sha256 != sha256sum(body) {
return Err(Error::bad_request(
"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_common::InvalidLength> {
let secret = String::from("AWS4") + secret_key;
let mut date_hmac = HmacSha256::new_from_slice(secret.as_bytes())?;
date_hmac.update(datetime.format(SHORT_DATE).to_string().as_bytes());
let mut region_hmac = HmacSha256::new_from_slice(&date_hmac.finalize().into_bytes())?;
region_hmac.update(region.as_bytes());
let mut service_hmac = HmacSha256::new_from_slice(®ion_hmac.finalize().into_bytes())?;
service_hmac.update(service.as_bytes());
let mut signing_hmac = HmacSha256::new_from_slice(&service_hmac.finalize().into_bytes())?;
signing_hmac.update(b"aws4_request");
let hmac = HmacSha256::new_from_slice(&signing_hmac.finalize().into_bytes())?;
Ok(hmac)
}
pub fn compute_scope(datetime: &DateTime<Utc>, region: &str, service: &str) -> String {
format!(
"{}/{}/{}/aws4_request",
datetime.format(SHORT_DATE),
region,
service
)
}
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