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// Copyright 2023 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! An implementation of Matrix server ACL rules.
use std::net::Ipv4Addr;
use std::str::FromStr;
use anyhow::Error;
use pyo3::prelude::*;
use regex::Regex;
use crate::push::utils::{glob_to_regex, GlobMatchType};
/// Called when registering modules with python.
pub fn register_module(py: Python<'_>, m: &PyModule) -> PyResult<()> {
let child_module = PyModule::new(py, "acl")?;
child_module.add_class::<ServerAclEvaluator>()?;
m.add_submodule(child_module)?;
// We need to manually add the module to sys.modules to make `from
// synapse.synapse_rust import acl` work.
py.import("sys")?
.getattr("modules")?
.set_item("synapse.synapse_rust.acl", child_module)?;
Ok(())
}
#[derive(Debug, Clone)]
#[pyclass(frozen)]
pub struct ServerAclEvaluator {
allow_ip_literals: bool,
allow: Vec<Regex>,
deny: Vec<Regex>,
}
#[pymethods]
impl ServerAclEvaluator {
#[new]
pub fn py_new(
allow_ip_literals: bool,
allow: Vec<&str>,
deny: Vec<&str>,
) -> Result<Self, Error> {
let allow = allow
.iter()
.map(|s| glob_to_regex(s, GlobMatchType::Whole))
.collect::<Result<_, _>>()?;
let deny = deny
.iter()
.map(|s| glob_to_regex(s, GlobMatchType::Whole))
.collect::<Result<_, _>>()?;
Ok(ServerAclEvaluator {
allow_ip_literals,
allow,
deny,
})
}
pub fn server_matches_acl_event(&self, server_name: &str) -> bool {
// first of all, check if literal IPs are blocked, and if so, whether the
// server name is a literal IP
if !self.allow_ip_literals {
// check for ipv6 literals. These start with '['.
if server_name.starts_with('[') {
return false;
}
// check for ipv4 literals. We can just lift the routine from std::net.
if Ipv4Addr::from_str(server_name).is_ok() {
return false;
}
}
// next, check the deny list
if self.deny.iter().any(|e| e.is_match(server_name)) {
return false;
}
// then the allow list.
if self.allow.iter().any(|e| e.is_match(server_name)) {
return true;
}
// everything else should be rejected.
false
}
}
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