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