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Add date verification to presigned urls (#196)

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fix #96
fix #162 by returning Forbidden instead Bad Request

Co-authored-by: Trinity Pointard <trinity.pointard@gmail.com>
Reviewed-on: Deuxfleurs/garage#196
Co-authored-by: trinity-1686a <trinity.pointard@gmail.com>
Co-committed-by: trinity-1686a <trinity.pointard@gmail.com>
This commit is contained in:
trinity-1686a 2022-01-18 12:22:31 +01:00 committed by Alex
parent 178e35f868
commit e55fa38c99
6 changed files with 67 additions and 35 deletions
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3
src/api/api_server.rs
View file

@ -91,6 +91,9 @@ async fn handler(
async fn handler_inner(garage: Arc<Garage>, req: Request<Body>) -> Result<Response<Body>, Error> {
let (api_key, content_sha256) = check_payload_signature(&garage, &req).await?;
let api_key = api_key.ok_or_else(|| {
Error::Forbidden("Garage does not support anonymous access yet".to_string())
})?;
let authority = req
.headers()

6
src/api/error.rs
View file

@ -206,11 +206,7 @@ where
fn ok_or_bad_request<M: AsRef<str>>(self, reason: M) -> Result<T, Error> {
match self {
Ok(x) => Ok(x),
Err(e) => Err(Error::BadRequest(format!(
"{}: {}",
reason.as_ref(),
e.to_string()
))),
Err(e) => Err(Error::BadRequest(format!("{}: {}", reason.as_ref(), e))),
}
}
}

4
src/api/s3_copy.rs
View file

@ -487,7 +487,7 @@ impl CopyPreconditionHeaders {
.get("x-amz-copy-source-if-modified-since")
.map(|x| x.to_str())
.transpose()?
.map(|x| httpdate::parse_http_date(x))
.map(httpdate::parse_http_date)
.transpose()
.ok_or_bad_request("Invalid date in x-amz-copy-source-if-modified-since")?,
copy_source_if_none_match: req
@ -505,7 +505,7 @@ impl CopyPreconditionHeaders {
.get("x-amz-copy-source-if-unmodified-since")
.map(|x| x.to_str())
.transpose()?
.map(|x| httpdate::parse_http_date(x))
.map(httpdate::parse_http_date)
.transpose()
.ok_or_bad_request("Invalid date in x-amz-copy-source-if-unmodified-since")?,
})

2
src/api/s3_list.rs
View file

@ -121,7 +121,7 @@ pub async fn handle_list(
key: uriencode_maybe(key, query.common.urlencode_resp),
last_modified: s3_xml::Value(msec_to_rfc3339(info.last_modified)),
size: s3_xml::IntValue(info.size as i64),
etag: s3_xml::Value(format!("\"{}\"", info.etag.to_string())),
etag: s3_xml::Value(format!("\"{}\"", info.etag)),
storage_class: s3_xml::Value("STANDARD".to_string()),
})
.collect(),

81
src/api/signature/payload.rs
View file

@ -20,7 +20,7 @@ use crate::error::*;
pub async fn check_payload_signature(
garage: &Garage,
request: &Request<Body>,
) -> Result<(Key, Option<Hash>), Error> {
) -> Result<(Option<Key>, Option<Hash>), Error> {
let mut headers = HashMap::new();
for (key, val) in request.headers() {
headers.insert(key.to_string(), val.to_str()?.to_string());
@ -34,24 +34,24 @@ pub async fn check_payload_signature(
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)?
} else {
parse_query_authorization(&headers)?
};
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()));
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));
}
};
let scope = format!(
"{}/{}/s3/aws4_request",
date.format(SHORT_DATE),
authorization.date.format(SHORT_DATE),
garage.config.s3_api.s3_region
);
if authorization.scope != scope {
@ -74,10 +74,10 @@ pub async fn check_payload_signature(
&authorization.signed_headers,
&authorization.content_sha256,
);
let string_to_sign = string_to_sign(&date, &scope, &canonical_request);
let string_to_sign = string_to_sign(&authorization.date, &scope, &canonical_request);
let mut hmac = signing_hmac(
&date,
&authorization.date,
&key_p.secret_key,
&garage.config.s3_api.s3_region,
"s3",
@ -104,7 +104,7 @@ pub async fn check_payload_signature(
Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid content sha256 hash")?)
};
Ok((key, content_sha256))
Ok((Some(key), content_sha256))
}
struct Authorization {
@ -113,6 +113,7 @@ struct Authorization {
signed_headers: String,
signature: String,
content_sha256: String,
date: DateTime<Utc>,
}
fn parse_authorization(
@ -147,6 +148,17 @@ fn parse_authorization(
.get("x-amz-content-sha256")
.ok_or_bad_request("Missing X-Amz-Content-Sha256 field")?;
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()));
}
let auth = Authorization {
key_id,
scope,
@ -159,15 +171,16 @@ fn parse_authorization(
.ok_or_bad_request("Could not find Signature in Authorization field")?
.to_string(),
content_sha256: content_sha256.to_string(),
date,
};
Ok(auth)
}
fn parse_query_authorization(headers: &HashMap<String, String>) -> Result<Authorization, Error> {
let algo = headers
.get("x-amz-algorithm")
.ok_or_bad_request("X-Amz-Algorithm not found in query parameters")?;
if algo != "AWS4-HMAC-SHA256" {
fn parse_query_authorization(
algorithm: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
if algorithm != "AWS4-HMAC-SHA256" {
return Err(Error::BadRequest(
"Unsupported authorization method".to_string(),
));
@ -188,12 +201,36 @@ fn parse_query_authorization(headers: &HashMap<String, String>) -> Result<Author
.map(|x| x.as_str())
.unwrap_or("UNSIGNED-PAYLOAD");
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()));
}
Ok(Authorization {
key_id,
scope,
signed_headers: signed_headers.to_string(),
signature: signature.to_string(),
content_sha256: content_sha256.to_string(),
date,
})
}

6
src/model/helper/error.rs
View file

@ -31,11 +31,7 @@ where
fn ok_or_bad_request<M: AsRef<str>>(self, reason: M) -> Result<T, Error> {
match self {
Ok(x) => Ok(x),
Err(e) => Err(Error::BadRequest(format!(
"{}: {}",
reason.as_ref(),
e.to_string()
))),
Err(e) => Err(Error::BadRequest(format!("{}: {}", reason.as_ref(), e))),
}
}
}