use quick_xml::de::from_reader;
use std::sync::Arc;
use http::header::{
ACCESS_CONTROL_ALLOW_HEADERS, ACCESS_CONTROL_ALLOW_METHODS, ACCESS_CONTROL_ALLOW_ORIGIN,
ACCESS_CONTROL_EXPOSE_HEADERS, ACCESS_CONTROL_REQUEST_HEADERS, ACCESS_CONTROL_REQUEST_METHOD,
};
use hyper::{header::HeaderName, Body, Method, Request, Response, StatusCode};
use serde::{Deserialize, Serialize};
use crate::s3::error::*;
use crate::s3::xml::{to_xml_with_header, xmlns_tag, IntValue, Value};
use crate::signature::verify_signed_content;
use garage_model::bucket_table::{Bucket, CorsRule as GarageCorsRule};
use garage_model::garage::Garage;
use garage_util::data::*;
pub async fn handle_get_cors(bucket: &Bucket) -> Result<Response<Body>, Error> {
let param = bucket
.params()
.ok_or_internal_error("Bucket should not be deleted at this point")?;
if let Some(cors) = param.cors_config.get() {
let wc = CorsConfiguration {
xmlns: (),
cors_rules: cors
.iter()
.map(CorsRule::from_garage_cors_rule)
.collect::<Vec<_>>(),
};
let xml = to_xml_with_header(&wc)?;
Ok(Response::builder()
.status(StatusCode::OK)
.header(http::header::CONTENT_TYPE, "application/xml")
.body(Body::from(xml))?)
} else {
Ok(Response::builder()
.status(StatusCode::NO_CONTENT)
.body(Body::empty())?)
}
}
pub async fn handle_delete_cors(
garage: Arc<Garage>,
mut bucket: Bucket,
) -> Result<Response<Body>, Error> {
let param = bucket
.params_mut()
.ok_or_internal_error("Bucket should not be deleted at this point")?;
param.cors_config.update(None);
garage.bucket_table.insert(&bucket).await?;
Ok(Response::builder()
.status(StatusCode::NO_CONTENT)
.body(Body::empty())?)
}
pub async fn handle_put_cors(
garage: Arc<Garage>,
mut bucket: Bucket,
req: Request<Body>,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
let body = hyper::body::to_bytes(req.into_body()).await?;
if let Some(content_sha256) = content_sha256 {
verify_signed_content(content_sha256, &body[..])?;
}
let param = bucket
.params_mut()
.ok_or_internal_error("Bucket should not be deleted at this point")?;
let conf: CorsConfiguration = from_reader(&body as &[u8])?;
conf.validate()?;
param
.cors_config
.update(Some(conf.into_garage_cors_config()?));
garage.bucket_table.insert(&bucket).await?;
Ok(Response::builder()
.status(StatusCode::OK)
.body(Body::empty())?)
}
pub async fn handle_options_s3api(
garage: Arc<Garage>,
req: &Request<Body>,
bucket_name: Option<String>,
) -> Result<Response<Body>, Error> {
// FIXME: CORS rules of buckets with local aliases are
// not taken into account.
// If the bucket name is a global bucket name,
// we try to apply the CORS rules of that bucket.
// If a user has a local bucket name that has
// the same name, its CORS rules won't be applied
// and will be shadowed by the rules of the globally
// existing bucket (but this is inevitable because
// OPTIONS calls are not auhtenticated).
if let Some(bn) = bucket_name {
let helper = garage.bucket_helper();
let bucket_id = helper.resolve_global_bucket_name(&bn).await?;
if let Some(id) = bucket_id {
let bucket = garage.bucket_helper().get_existing_bucket(id).await?;
handle_options_for_bucket(req, &bucket)
} else {
// If there is a bucket name in the request, but that name
// does not correspond to a global alias for a bucket,
// then it's either a non-existing bucket or a local bucket.
// We have no way of knowing, because the request is not
// authenticated and thus we can't resolve local aliases.
// We take the permissive approach of allowing everything,
// because we don't want to prevent web apps that use
// local bucket names from making API calls.
Ok(Response::builder()
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.header(ACCESS_CONTROL_ALLOW_METHODS, "*")
.status(StatusCode::OK)
.body(Body::empty())?)
}
} else {
// If there is no bucket name in the request,
// we are doing a ListBuckets call, which we want to allow
// for all origins.
Ok(Response::builder()
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.header(ACCESS_CONTROL_ALLOW_METHODS, "GET")
.status(StatusCode::OK)
.body(Body::empty())?)
}
}
pub fn handle_options_for_bucket(
req: &Request<Body>,
bucket: &Bucket,
) -> Result<Response<Body>, Error> {
let origin = req
.headers()
.get("Origin")
.ok_or_bad_request("Missing Origin header")?
.to_str()?;
let request_method = req
.headers()
.get(ACCESS_CONTROL_REQUEST_METHOD)
.ok_or_bad_request("Missing Access-Control-Request-Method header")?
.to_str()?;
let request_headers = match req.headers().get(ACCESS_CONTROL_REQUEST_HEADERS) {
Some(h) => h.to_str()?.split(',').map(|h| h.trim()).collect::<Vec<_>>(),
None => vec![],
};
if let Some(cors_config) = bucket.params().unwrap().cors_config.get() {
let matching_rule = cors_config
.iter()
.find(|rule| cors_rule_matches(rule, origin, request_method, request_headers.iter()));
if let Some(rule) = matching_rule {
let mut resp = Response::builder()
.status(StatusCode::OK)
.body(Body::empty())?;
add_cors_headers(&mut resp, rule).ok_or_internal_error("Invalid CORS configuration")?;
return Ok(resp);
}
}
Err(Error::forbidden("This CORS request is not allowed."))
}
pub fn find_matching_cors_rule<'a>(
bucket: &'a Bucket,
req: &Request<Body>,
) -> Result<Option<&'a GarageCorsRule>, Error> {
if let Some(cors_config) = bucket.params().unwrap().cors_config.get() {
if let Some(origin) = req.headers().get("Origin") {
let origin = origin.to_str()?;
let request_headers = match req.headers().get(ACCESS_CONTROL_REQUEST_HEADERS) {
Some(h) => h.to_str()?.split(',').map(|h| h.trim()).collect::<Vec<_>>(),
None => vec![],
};
return Ok(cors_config.iter().find(|rule| {
cors_rule_matches(rule, origin, req.method().as_ref(), request_headers.iter())
}));
}
}
Ok(None)
}
fn cors_rule_matches<'a, HI, S>(
rule: &GarageCorsRule,
origin: &'a str,
method: &'a str,
mut request_headers: HI,
) -> bool
where
HI: Iterator<Item = S>,
S: AsRef<str>,
{
rule.allow_origins.iter().any(|x| x == "*" || x == origin)
&& rule.allow_methods.iter().any(|x| x == "*" || x == method)
&& request_headers.all(|h| {
rule.allow_headers
.iter()
.any(|x| x == "*" || x == h.as_ref())
})
}
pub fn add_cors_headers(
resp: &mut Response<Body>,
rule: &GarageCorsRule,
) -> Result<(), http::header::InvalidHeaderValue> {
let h = resp.headers_mut();
h.insert(
ACCESS_CONTROL_ALLOW_ORIGIN,
rule.allow_origins.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_ALLOW_METHODS,
rule.allow_methods.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_ALLOW_HEADERS,
rule.allow_headers.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_EXPOSE_HEADERS,
rule.expose_headers.join(", ").parse()?,
);
Ok(())
}
// ---- SERIALIZATION AND DESERIALIZATION TO/FROM S3 XML ----
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
#[serde(rename = "CORSConfiguration")]
pub struct CorsConfiguration {
#[serde(serialize_with = "xmlns_tag", skip_deserializing)]
pub xmlns: (),
#[serde(rename = "CORSRule")]
pub cors_rules: Vec<CorsRule>,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct CorsRule {
#[serde(rename = "ID")]
pub id: Option<Value>,
#[serde(rename = "MaxAgeSeconds")]
pub max_age_seconds: Option<IntValue>,
#[serde(rename = "AllowedOrigin")]
pub allowed_origins: Vec<Value>,
#[serde(rename = "AllowedMethod")]
pub allowed_methods: Vec<Value>,
#[serde(rename = "AllowedHeader", default)]
pub allowed_headers: Vec<Value>,
#[serde(rename = "ExposeHeader", default)]
pub expose_headers: Vec<Value>,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct AllowedMethod {
#[serde(rename = "AllowedMethod")]
pub allowed_method: Value,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct AllowedHeader {
#[serde(rename = "AllowedHeader")]
pub allowed_header: Value,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct ExposeHeader {
#[serde(rename = "ExposeHeader")]
pub expose_header: Value,
}
impl CorsConfiguration {
pub fn validate(&self) -> Result<(), Error> {
for r in self.cors_rules.iter() {
r.validate()?;
}
Ok(())
}
pub fn into_garage_cors_config(self) -> Result<Vec<GarageCorsRule>, Error> {
Ok(self
.cors_rules
.iter()
.map(CorsRule::to_garage_cors_rule)
.collect())
}
}
impl CorsRule {
pub fn validate(&self) -> Result<(), Error> {
for method in self.allowed_methods.iter() {
method
.0
.parse::<Method>()
.ok_or_bad_request("Invalid CORSRule method")?;
}
for header in self
.allowed_headers
.iter()
.chain(self.expose_headers.iter())
{
header
.0
.parse::<HeaderName>()
.ok_or_bad_request("Invalid HTTP header name")?;
}
Ok(())
}
pub fn to_garage_cors_rule(&self) -> GarageCorsRule {
let convert_vec =
|vval: &[Value]| vval.iter().map(|x| x.0.to_owned()).collect::<Vec<String>>();
GarageCorsRule {
id: self.id.as_ref().map(|x| x.0.to_owned()),
max_age_seconds: self.max_age_seconds.as_ref().map(|x| x.0 as u64),
allow_origins: convert_vec(&self.allowed_origins),
allow_methods: convert_vec(&self.allowed_methods),
allow_headers: convert_vec(&self.allowed_headers),
expose_headers: convert_vec(&self.expose_headers),
}
}
pub fn from_garage_cors_rule(rule: &GarageCorsRule) -> Self {
let convert_vec = |vval: &[String]| {
vval.iter()
.map(|x| Value(x.clone()))
.collect::<Vec<Value>>()
};
Self {
id: rule.id.as_ref().map(|x| Value(x.clone())),
max_age_seconds: rule.max_age_seconds.map(|x| IntValue(x as i64)),
allowed_origins: convert_vec(&rule.allow_origins),
allowed_methods: convert_vec(&rule.allow_methods),
allowed_headers: convert_vec(&rule.allow_headers),
expose_headers: convert_vec(&rule.expose_headers),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use quick_xml::de::from_str;
#[test]
fn test_deserialize() -> Result<(), Error> {
let message = r#"<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<CORSRule>
<AllowedOrigin>http://www.example.com</AllowedOrigin>
<AllowedMethod>PUT</AllowedMethod>
<AllowedMethod>POST</AllowedMethod>
<AllowedMethod>DELETE</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
</CORSRule>
<CORSRule>
<AllowedOrigin>*</AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
</CORSRule>
<CORSRule>
<ID>qsdfjklm</ID>
<MaxAgeSeconds>12345</MaxAgeSeconds>
<AllowedOrigin>https://perdu.com</AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
<AllowedMethod>DELETE</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
<ExposeHeader>*</ExposeHeader>
</CORSRule>
</CORSConfiguration>"#;
let conf: CorsConfiguration = from_str(message).unwrap();
let ref_value = CorsConfiguration {
xmlns: (),
cors_rules: vec![
CorsRule {
id: None,
max_age_seconds: None,
allowed_origins: vec!["http://www.example.com".into()],
allowed_methods: vec!["PUT".into(), "POST".into(), "DELETE".into()],
allowed_headers: vec!["*".into()],
expose_headers: vec![],
},
CorsRule {
id: None,
max_age_seconds: None,
allowed_origins: vec!["*".into()],
allowed_methods: vec!["GET".into()],
allowed_headers: vec![],
expose_headers: vec![],
},
CorsRule {
id: Some("qsdfjklm".into()),
max_age_seconds: Some(IntValue(12345)),
allowed_origins: vec!["https://perdu.com".into()],
allowed_methods: vec!["GET".into(), "DELETE".into()],
allowed_headers: vec!["*".into()],
expose_headers: vec!["*".into()],
},
],
};
assert_eq! {
ref_value,
conf
};
let message2 = to_xml_with_header(&ref_value)?;
let cleanup = |c: &str| c.replace(char::is_whitespace, "");
assert_eq!(cleanup(message), cleanup(&message2));
Ok(())
}
}
