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|
use super::authorizer::Authorizer;
use cedar_policy::{
Authorizer as CedarAuth, Context, Entities, EntityId, EntityTypeName, EntityUid, PolicySet,
Request as CedarRequest, RestrictedExpression,
};
use envoy_types::ext_authz::v3::pb::CheckRequest;
use std::collections::HashMap;
use std::str::FromStr;
#[derive(Debug)]
pub struct CedarAuthorizer {
policies: PolicySet,
authorizer: CedarAuth,
}
impl CedarAuthorizer {
pub fn new() -> CedarAuthorizer {
let policy_src = include_str!("../../policies/auth_policy.cedar");
let policies = policy_src.parse().expect("Failed to parse Cedar policies");
let authorizer = CedarAuth::new();
CedarAuthorizer {
policies,
authorizer,
}
}
}
impl Default for CedarAuthorizer {
fn default() -> Self {
Self::new()
}
}
impl Authorizer for CedarAuthorizer {
fn authorize(&self, request: CheckRequest) -> bool {
let headers = match request
.attributes
.as_ref()
.and_then(|attr| attr.request.as_ref())
.and_then(|req| req.http.as_ref())
.map(|http| &http.headers)
{
Some(headers) => headers,
None => return false,
};
// Extract authorization token
let bearer_token = headers
.get("authorization")
.and_then(|auth| auth.strip_prefix("Bearer "))
.unwrap_or("");
// Extract request path for static asset checking
let path = headers
.get(":path")
.or_else(|| headers.get("path"))
.map_or("", |v| v.as_str());
// Create Cedar entities and request
match self.create_cedar_request(bearer_token, path) {
Ok(cedar_request) => {
let entities = Entities::empty();
let response =
self.authorizer
.is_authorized(&cedar_request, &self.policies, &entities);
matches!(response.decision(), cedar_policy::Decision::Allow)
}
Err(_) => false,
}
}
}
impl CedarAuthorizer {
fn create_cedar_request(
&self,
bearer_token: &str,
path: &str,
) -> Result<CedarRequest, Box<dyn std::error::Error>> {
// Create principal entity
let principal_id = EntityId::from_str("client")?;
let principal_type = EntityTypeName::from_str("User")?;
let principal = EntityUid::from_type_name_and_id(principal_type, principal_id);
// Create action entity
let action_id = EntityId::from_str("check")?;
let action_type = EntityTypeName::from_str("Action")?;
let action = EntityUid::from_type_name_and_id(action_type, action_id);
// Create resource entity
let resource_id = EntityId::from_str("resource")?;
let resource_type = EntityTypeName::from_str("Resource")?;
let resource = EntityUid::from_type_name_and_id(resource_type, resource_id);
// Create context with bearer token and path
let mut context_map = HashMap::new();
if !bearer_token.is_empty() {
context_map.insert(
"bearer_token".to_string(),
RestrictedExpression::from_str(&format!("\"{}\"", bearer_token))?,
);
}
if !path.is_empty() {
context_map.insert(
"path".to_string(),
RestrictedExpression::from_str(&format!("\"{}\"", path))?,
);
}
let context = Context::from_pairs(context_map.into_iter().collect::<Vec<_>>())?;
CedarRequest::new(principal, action, resource, context, None)
.map_err(|e| Box::new(e) as Box<dyn std::error::Error>)
}
}
#[cfg(test)]
mod tests {
use super::*;
use envoy_types::pb::envoy::service::auth::v3::AttributeContext;
use envoy_types::pb::envoy::service::auth::v3::attribute_context::{HttpRequest, Request};
use std::collections::HashMap;
fn create_request(f: impl std::ops::FnOnce(&mut HttpRequest)) -> CheckRequest {
please::build_with(|item: &mut CheckRequest| {
item.attributes = Some(please::build_with(|item: &mut AttributeContext| {
item.request = Some(please::build_with(|item: &mut Request| {
item.http = Some(please::build_with(|item: &mut HttpRequest| f(item)));
}));
}));
})
}
#[test]
fn test_cedar_authorizer_allows_valid_token() {
let authorizer = CedarAuthorizer::new();
let mut headers = HashMap::new();
headers.insert(
"authorization".to_string(),
"Bearer valid-token".to_string(),
);
let request = create_request(|item: &mut HttpRequest| {
item.headers = headers;
});
let result = authorizer.authorize(request);
assert!(result);
}
#[test]
fn test_cedar_authorizer_denies_invalid_token() {
let authorizer = CedarAuthorizer::new();
let mut headers = HashMap::new();
headers.insert(
"authorization".to_string(),
"Bearer invalid-token".to_string(),
);
let request = create_request(|item: &mut HttpRequest| {
item.headers = headers;
});
let result = authorizer.authorize(request);
assert!(!result);
}
#[test]
fn test_cedar_authorizer_denies_missing_header() {
let authorizer = CedarAuthorizer::new();
let headers = HashMap::new();
let request = create_request(|item: &mut HttpRequest| {
item.headers = headers;
});
let result = authorizer.authorize(request);
assert!(!result);
}
#[test]
fn test_cedar_authorizer_allows_static_assets() {
let authorizer = CedarAuthorizer::new();
let mut headers = HashMap::new();
headers.insert(":path".to_string(), "/static/style.css".to_string());
let request = create_request(|item: &mut HttpRequest| {
item.headers = headers;
});
let result = authorizer.authorize(request);
assert!(result);
}
#[test]
fn test_cedar_authorizer_allows_js_assets() {
let authorizer = CedarAuthorizer::new();
let mut headers = HashMap::new();
headers.insert(":path".to_string(), "/app.js".to_string());
let request = create_request(|item: &mut HttpRequest| {
item.headers = headers;
});
let result = authorizer.authorize(request);
assert!(result);
}
// test css passthrough
// test javascript passthrough
// test ico passthrough
// test png,jpg,bmp passthrough
// test html passthrough
// #[test]
// fn authorize_test_css_passthrough() {
// let authorizer = CedarAuthorizer::new();
// let request = CheckRequest {
// attributes: Some(AttributeContext {
// ..Default::default()
// }),
// };
// let result = authorizer.authorize(request);
// assert!(result)
// }
}
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