garage/src/api/signature/payload.rs

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use std::collections::HashMap;
use chrono::{DateTime, Duration, NaiveDateTime, Utc};
use hmac::Mac;
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use hyper::{Body, Method, Request};
use sha2::{Digest, Sha256};
use garage_table::*;
use garage_util::data::Hash;
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use garage_model::garage::Garage;
use garage_model::key_table::*;
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use super::signing_hmac;
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(
garage: &Garage,
request: &Request<Body>,
) -> Result<(Option<Key>, Option<Hash>), Error> {
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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 if let Some(algorithm) = headers.get("x-amz-algorithm") {
parse_query_authorization(algorithm, &headers)?
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} else {
let content_sha256 = headers.get("x-amz-content-sha256");
if let Some(content_sha256) = content_sha256.filter(|c| "UNSIGNED-PAYLOAD" != c.as_str()) {
let sha256 = hex::decode(content_sha256)
.ok()
.and_then(|bytes| Hash::try_from(&bytes))
.ok_or_bad_request("Invalid content sha256 hash")?;
return Ok((None, Some(sha256)));
} else {
return Ok((None, None));
}
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};
let scope = format!(
"{}/{}/s3/aws4_request",
authorization.date.format(SHORT_DATE),
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garage.config.s3_api.s3_region
);
if authorization.scope != scope {
return Err(Error::AuthorizationHeaderMalformed(scope.to_string()));
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}
let key = garage
.key_table
.get(&EmptyKey, &authorization.key_id)
.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)))?;
let key_p = key.params().unwrap();
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let canonical_request = canonical_request(
request.method(),
&request.uri().path().to_string(),
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&canonical_query_string(request.uri()),
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&headers,
&authorization.signed_headers,
&authorization.content_sha256,
);
let string_to_sign = string_to_sign(&authorization.date, &scope, &canonical_request);
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let mut hmac = signing_hmac(
&authorization.date,
&key_p.secret_key,
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&garage.config.s3_api.s3_region,
"s3",
)
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.ok_or_internal_error("Unable to build signing HMAC")?;
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hmac.update(string_to_sign.as_bytes());
let signature = hex::encode(hmac.finalize().into_bytes());
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if authorization.signature != signature {
trace!("Canonical request: ``{}``", canonical_request);
trace!("String to sign: ``{}``", string_to_sign);
trace!("Expected: {}, got: {}", signature, authorization.signature);
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return Err(Error::Forbidden("Invalid signature".to_string()));
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}
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 {
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let bytes = hex::decode(authorization.content_sha256)
.ok_or_bad_request("Invalid content sha256 hash")?;
Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid content sha256 hash")?)
};
Ok((Some(key), content_sha256))
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}
struct Authorization {
key_id: String,
scope: String,
signed_headers: String,
signature: String,
content_sha256: String,
date: DateTime<Utc>,
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}
fn parse_authorization(
authorization: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
let first_space = authorization
.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);
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();
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let eq = auth_part
.find('=')
.ok_or_bad_request("Field without value in authorization header")?;
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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")
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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)?;
let content_sha256 = headers
.get("x-amz-content-sha256")
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.ok_or_bad_request("Missing X-Amz-Content-Sha256 field")?;
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let date = headers
.get("x-amz-date")
.ok_or_bad_request("Missing X-Amz-Date field")?;
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);
if Utc::now() - date > Duration::hours(24) {
return Err(Error::BadRequest("Date is too old".to_string()));
}
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let auth = Authorization {
key_id,
scope,
signed_headers: auth_params
.get("SignedHeaders")
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.ok_or_bad_request("Could not find SignedHeaders in Authorization field")?
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.to_string(),
signature: auth_params
.get("Signature")
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.ok_or_bad_request("Could not find Signature in Authorization field")?
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.to_string(),
content_sha256: content_sha256.to_string(),
date,
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};
Ok(auth)
}
fn parse_query_authorization(
algorithm: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
if algorithm != "AWS4-HMAC-SHA256" {
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return Err(Error::BadRequest(
"Unsupported authorization method".to_string(),
));
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}
let cred = headers
.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)?;
let signed_headers = headers
.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
.get("x-amz-signature")
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.ok_or_bad_request("X-Amz-Signature not found in query parameters")?;
let content_sha256 = headers
.get("x-amz-content-sha256")
.map(|x| x.as_str())
.unwrap_or("UNSIGNED-PAYLOAD");
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let duration = headers
.get("x-amz-expires")
.ok_or_bad_request("X-Amz-Expires not found in query parameters")?
.parse()
.map_err(|_| Error::BadRequest("X-Amz-Expires is not a number".to_string()))?;
if duration > 7 * 24 * 3600 {
return Err(Error::BadRequest(
"X-Amz-Exprires may not exceed a week".to_string(),
));
}
let date = headers
.get("x-amz-date")
.ok_or_bad_request("Missing X-Amz-Date field")?;
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);
if Utc::now() - date > Duration::seconds(duration) {
return Err(Error::BadRequest("Date is too old".to_string()));
}
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Ok(Authorization {
key_id,
scope,
signed_headers: signed_headers.to_string(),
signature: signature.to_string(),
content_sha256: content_sha256.to_string(),
date,
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})
}
fn parse_credential(cred: &str) -> Result<(String, String), Error> {
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let first_slash = cred
.find('/')
.ok_or_bad_request("Credentials does not contain / in authorization field")?;
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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();
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hasher.update(canonical_req.as_bytes());
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[
"AWS4-HMAC-SHA256",
&datetime.format(LONG_DATETIME).to_string(),
scope_string,
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&hex::encode(hasher.finalize().as_slice()),
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]
.join("\n")
}
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,
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&canonical_header_string(headers, signed_headers),
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"",
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()))
.collect::<Vec<_>>();
items.sort_by(|(k1, _), (k2, _)| k1.cmp(k2));
items
.iter()
.map(|(key, value)| key.to_lowercase() + ":" + value.trim())
.collect::<Vec<_>>()
.join("\n")
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}
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()
}
}