308 lines
8.3 KiB
Rust
308 lines
8.3 KiB
Rust
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use std::collections::HashMap;
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use chrono::{DateTime, Duration, NaiveDateTime, Utc};
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use hmac::{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::error::Error;
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use garage_core::garage::Garage;
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use garage_core::key_table::*;
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const SHORT_DATE: &str = "%Y%m%d";
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const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
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type HmacSha256 = Hmac<Sha256>;
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pub async fn check_signature(garage: &Garage, request: &Request<Body>) -> Result<Key, 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(Error::BadRequest("Missing X-Amz-Date field".into()))?;
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let date: NaiveDateTime = NaiveDateTime::parse_from_str(date, LONG_DATETIME)
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.map_err(|e| Error::BadRequest(format!("Invalid date: {}", e)))?
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.into();
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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(format!("Date is too old")));
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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::BadRequest(format!(
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"Invalid scope in authorization field, expected: {}",
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scope
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)));
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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.deleted)
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.ok_or(Error::Forbidden(format!(
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"No such key: {}",
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authorization.key_id
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)))?;
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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.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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.map_err(|e| Error::Message(format!("Unable to build signing HMAC: {}", e)))?;
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hmac.input(string_to_sign.as_bytes());
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let signature = hex::encode(hmac.result().code());
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if authorization.signature != signature {
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return Err(Error::Forbidden(format!("Invalid signature")));
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}
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Ok(key)
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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(Error::BadRequest("Authorization field too short".into()))?;
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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.find('=').ok_or(Error::BadRequest(format!(
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"Missing =value in authorization field {}",
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auth_part
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)))?;
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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(Error::BadRequest(format!(
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"Could not find Credential in Authorization field"
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)))?;
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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(Error::BadRequest(
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"Missing X-Amz-Content-Sha256 field".into(),
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))?;
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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(Error::BadRequest(format!(
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"Could not find SignedHeaders in Authorization field"
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)))?
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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(Error::BadRequest(format!(
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"Could not find Signature in Authorization field"
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)))?
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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(Error::BadRequest(format!(
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"X-Amz-Algorithm not found in query parameters"
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)))?;
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if algo != "AWS4-HMAC-SHA256" {
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return Err(Error::BadRequest(format!(
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"Unsupported authorization method"
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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(Error::BadRequest(format!(
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"X-Amz-Credential not found in query parameters"
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)))?;
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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(Error::BadRequest(format!(
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"X-Amz-SignedHeaders not found in query parameters"
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)))?;
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let signature = headers
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.get("x-amz-signature")
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.ok_or(Error::BadRequest(format!(
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"X-Amz-Signature not found in query parameters"
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)))?;
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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: "UNSIGNED-PAYLOAD".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.find('/').ok_or(Error::BadRequest(format!(
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"Credentials does not contain / in authorization field"
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)))?;
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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.input(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.result().as_slice()),
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]
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.join("\n")
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}
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fn signing_hmac(
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datetime: &DateTime<Utc>,
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secret_key: &str,
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region: &str,
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service: &str,
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) -> Result<HmacSha256, crypto_mac::InvalidKeyLength> {
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let secret = String::from("AWS4") + secret_key;
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let mut date_hmac = HmacSha256::new_varkey(secret.as_bytes())?;
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date_hmac.input(datetime.format(SHORT_DATE).to_string().as_bytes());
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let mut region_hmac = HmacSha256::new_varkey(&date_hmac.result().code())?;
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region_hmac.input(region.as_bytes());
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let mut service_hmac = HmacSha256::new_varkey(®ion_hmac.result().code())?;
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service_hmac.input(service.as_bytes());
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let mut signing_hmac = HmacSha256::new_varkey(&service_hmac.result().code())?;
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signing_hmac.input(b"aws4_request");
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let hmac = HmacSha256::new_varkey(&signing_hmac.result().code())?;
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Ok(hmac)
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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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.map(|(key, value)| key.to_lowercase() + ":" + value.trim())
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.collect::<Vec<_>>();
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items.sort();
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items.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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fn uri_encode(string: &str, encode_slash: bool) -> String {
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let mut result = String::with_capacity(string.len() * 2);
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for c in string.chars() {
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match c {
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'a'..='z' | 'A'..='Z' | '0'..='9' | '_' | '-' | '~' | '.' => result.push(c),
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'/' if encode_slash => result.push_str("%2F"),
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'/' if !encode_slash => result.push('/'),
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_ => {
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result.push('%');
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result.push_str(
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&format!("{}", c)
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.bytes()
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.map(|b| format!("{:02X}", b))
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.collect::<String>(),
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);
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}
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}
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}
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result
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}
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