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authorAlex Auvolat <alex@adnab.me>2020-04-24 17:46:52 +0000
committerAlex Auvolat <alex@adnab.me>2020-04-24 17:46:52 +0000
commitf2e05986c4d8cdf4abfde92e51e36f456e276ccd (patch)
tree174b2797468d47d6eb5ec6e3f4d0d768bb986151 /src/api/signature.rs
parentd8f5e643bcee95969b59c309809710a38b0661e3 (diff)
downloadgarage-f2e05986c4d8cdf4abfde92e51e36f456e276ccd.tar.gz
garage-f2e05986c4d8cdf4abfde92e51e36f456e276ccd.zip
Starting to be S3 compatible
Diffstat (limited to 'src/api/signature.rs')
-rw-r--r--src/api/signature.rs307
1 files changed, 307 insertions, 0 deletions
diff --git a/src/api/signature.rs b/src/api/signature.rs
new file mode 100644
index 00000000..2e82269c
--- /dev/null
+++ b/src/api/signature.rs
@@ -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
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 13:42:35 +0000