270 lines
7.6 KiB
Rust
270 lines
7.6 KiB
Rust
use std::collections::HashMap;
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use chrono::{DateTime, Duration, NaiveDateTime, Utc};
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use hmac::Mac;
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use hyper::{Body, Method, Request};
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use sha2::{Digest, Sha256};
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use garage_table::*;
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use garage_util::data::Hash;
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use garage_model::garage::Garage;
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use garage_model::key_table::*;
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use super::signing_hmac;
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use super::{LONG_DATETIME, SHORT_DATE};
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use crate::encoding::uri_encode;
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use crate::error::*;
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pub async fn check_payload_signature(
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garage: &Garage,
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request: &Request<Body>,
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) -> Result<(Key, Option<Hash>), Error> {
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let mut headers = HashMap::new();
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for (key, val) in request.headers() {
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headers.insert(key.to_string(), val.to_str()?.to_string());
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}
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if let Some(query) = request.uri().query() {
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let query_pairs = url::form_urlencoded::parse(query.as_bytes());
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for (key, val) in query_pairs {
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headers.insert(key.to_lowercase(), val.to_string());
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}
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}
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let authorization = if let Some(authorization) = headers.get("authorization") {
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parse_authorization(authorization, &headers)?
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} else {
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parse_query_authorization(&headers)?
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};
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let date = headers
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.get("x-amz-date")
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.ok_or_bad_request("Missing X-Amz-Date field")?;
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let date: NaiveDateTime =
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NaiveDateTime::parse_from_str(date, LONG_DATETIME).ok_or_bad_request("Invalid date")?;
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let date: DateTime<Utc> = DateTime::from_utc(date, Utc);
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if Utc::now() - date > Duration::hours(24) {
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return Err(Error::BadRequest("Date is too old".to_string()));
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}
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let scope = format!(
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"{}/{}/s3/aws4_request",
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date.format(SHORT_DATE),
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garage.config.s3_api.s3_region
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);
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if authorization.scope != scope {
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return Err(Error::AuthorizationHeaderMalformed(scope.to_string()));
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}
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let key = garage
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.key_table
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.get(&EmptyKey, &authorization.key_id)
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.await?
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.filter(|k| !k.state.is_deleted())
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.ok_or_else(|| Error::Forbidden(format!("No such key: {}", authorization.key_id)))?;
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let key_p = key.params().unwrap();
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let canonical_request = canonical_request(
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request.method(),
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&request.uri().path().to_string(),
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&canonical_query_string(request.uri()),
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&headers,
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&authorization.signed_headers,
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&authorization.content_sha256,
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);
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let string_to_sign = string_to_sign(&date, &scope, &canonical_request);
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let mut hmac = signing_hmac(
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&date,
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&key_p.secret_key,
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&garage.config.s3_api.s3_region,
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"s3",
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)
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.ok_or_internal_error("Unable to build signing HMAC")?;
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hmac.update(string_to_sign.as_bytes());
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let signature = hex::encode(hmac.finalize().into_bytes());
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if authorization.signature != signature {
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trace!("Canonical request: ``{}``", canonical_request);
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trace!("String to sign: ``{}``", string_to_sign);
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trace!("Expected: {}, got: {}", signature, authorization.signature);
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return Err(Error::Forbidden("Invalid signature".to_string()));
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}
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let content_sha256 = if authorization.content_sha256 == "UNSIGNED-PAYLOAD" {
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None
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} else if authorization.content_sha256 == "STREAMING-AWS4-HMAC-SHA256-PAYLOAD" {
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let bytes = hex::decode(authorization.signature).ok_or_bad_request("Invalid signature")?;
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Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid signature")?)
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} else {
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let bytes = hex::decode(authorization.content_sha256)
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.ok_or_bad_request("Invalid content sha256 hash")?;
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Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid content sha256 hash")?)
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};
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Ok((key, content_sha256))
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}
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struct Authorization {
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key_id: String,
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scope: String,
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signed_headers: String,
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signature: String,
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content_sha256: String,
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}
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fn parse_authorization(
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authorization: &str,
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headers: &HashMap<String, String>,
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) -> Result<Authorization, Error> {
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let first_space = authorization
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.find(' ')
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.ok_or_bad_request("Authorization field to short")?;
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let (auth_kind, rest) = authorization.split_at(first_space);
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if auth_kind != "AWS4-HMAC-SHA256" {
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return Err(Error::BadRequest("Unsupported authorization method".into()));
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}
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let mut auth_params = HashMap::new();
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for auth_part in rest.split(',') {
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let auth_part = auth_part.trim();
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let eq = auth_part
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.find('=')
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.ok_or_bad_request("Field without value in authorization header")?;
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let (key, value) = auth_part.split_at(eq);
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auth_params.insert(key.to_string(), value.trim_start_matches('=').to_string());
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}
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let cred = auth_params
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.get("Credential")
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.ok_or_bad_request("Could not find Credential in Authorization field")?;
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let (key_id, scope) = parse_credential(cred)?;
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let content_sha256 = headers
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.get("x-amz-content-sha256")
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.ok_or_bad_request("Missing X-Amz-Content-Sha256 field")?;
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let auth = Authorization {
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key_id,
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scope,
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signed_headers: auth_params
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.get("SignedHeaders")
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.ok_or_bad_request("Could not find SignedHeaders in Authorization field")?
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.to_string(),
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signature: auth_params
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.get("Signature")
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.ok_or_bad_request("Could not find Signature in Authorization field")?
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.to_string(),
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content_sha256: content_sha256.to_string(),
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};
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Ok(auth)
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}
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fn parse_query_authorization(headers: &HashMap<String, String>) -> Result<Authorization, Error> {
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let algo = headers
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.get("x-amz-algorithm")
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.ok_or_bad_request("X-Amz-Algorithm not found in query parameters")?;
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if algo != "AWS4-HMAC-SHA256" {
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return Err(Error::BadRequest(
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"Unsupported authorization method".to_string(),
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));
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}
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let cred = headers
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.get("x-amz-credential")
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.ok_or_bad_request("X-Amz-Credential not found in query parameters")?;
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let (key_id, scope) = parse_credential(cred)?;
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let signed_headers = headers
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.get("x-amz-signedheaders")
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.ok_or_bad_request("X-Amz-SignedHeaders not found in query parameters")?;
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let signature = headers
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.get("x-amz-signature")
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.ok_or_bad_request("X-Amz-Signature not found in query parameters")?;
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let content_sha256 = headers
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.get("x-amz-content-sha256")
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.map(|x| x.as_str())
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.unwrap_or("UNSIGNED-PAYLOAD");
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Ok(Authorization {
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key_id,
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scope,
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signed_headers: signed_headers.to_string(),
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signature: signature.to_string(),
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content_sha256: content_sha256.to_string(),
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})
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}
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fn parse_credential(cred: &str) -> Result<(String, String), Error> {
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let first_slash = cred
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.find('/')
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.ok_or_bad_request("Credentials does not contain / in authorization field")?;
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let (key_id, scope) = cred.split_at(first_slash);
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Ok((
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key_id.to_string(),
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scope.trim_start_matches('/').to_string(),
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))
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}
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fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_req: &str) -> String {
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let mut hasher = Sha256::default();
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hasher.update(canonical_req.as_bytes());
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[
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"AWS4-HMAC-SHA256",
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&datetime.format(LONG_DATETIME).to_string(),
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scope_string,
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&hex::encode(hasher.finalize().as_slice()),
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]
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.join("\n")
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}
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fn canonical_request(
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method: &Method,
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url_path: &str,
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canonical_query_string: &str,
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headers: &HashMap<String, String>,
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signed_headers: &str,
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content_sha256: &str,
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) -> String {
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[
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method.as_str(),
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url_path,
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canonical_query_string,
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&canonical_header_string(headers, signed_headers),
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"",
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signed_headers,
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content_sha256,
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]
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.join("\n")
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}
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fn canonical_header_string(headers: &HashMap<String, String>, signed_headers: &str) -> String {
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let signed_headers_vec = signed_headers.split(';').collect::<Vec<_>>();
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let mut items = headers
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.iter()
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.filter(|(key, _)| signed_headers_vec.contains(&key.as_str()))
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.collect::<Vec<_>>();
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items.sort_by(|(k1, _), (k2, _)| k1.cmp(k2));
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items
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.iter()
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.map(|(key, value)| key.to_lowercase() + ":" + value.trim())
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.collect::<Vec<_>>()
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.join("\n")
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}
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fn canonical_query_string(uri: &hyper::Uri) -> String {
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if let Some(query) = uri.query() {
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let query_pairs = url::form_urlencoded::parse(query.as_bytes());
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let mut items = query_pairs
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.filter(|(key, _)| key != "X-Amz-Signature")
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.map(|(key, value)| uri_encode(&key, true) + "=" + &uri_encode(&value, true))
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.collect::<Vec<_>>();
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items.sort();
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items.join("&")
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} else {
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"".to_string()
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}
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}
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