mirror of
https://github.com/SteamFramelyHomebrew/framely.git
synced 2026-10-23 09:01:46 +02:00
102 lines
3.4 KiB
Rust
102 lines
3.4 KiB
Rust
use anyhow::{ensure, Context, Result};
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use serde_json::Value;
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use std::{
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collections::BTreeMap,
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fs,
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path::Path,
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sync::{Arc, Mutex},
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time::{Duration, Instant},
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};
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#[derive(Clone, Default)]
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pub struct Verifier {
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state: Arc<Mutex<Limits>>,
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}
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#[derive(Default)]
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struct Limits {
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active: usize,
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global: Vec<Instant>,
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peers: BTreeMap<String, Vec<Instant>>,
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}
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struct Permit(Verifier);
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impl Drop for Permit {
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fn drop(&mut self) {
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self.0.state.lock().unwrap().active -= 1;
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}
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}
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impl Verifier {
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#[cfg(test)]
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pub(crate) fn active(&self) -> usize {
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self.state.lock().unwrap().active
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}
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fn acquire(&self, peer: &str, now: Instant) -> Result<Permit> {
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let mut state = self.state.lock().unwrap();
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state
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.global
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.retain(|t| now.duration_since(*t) < Duration::from_secs(60));
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state.peers.retain(|_, times| {
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times.retain(|t| now.duration_since(*t) < Duration::from_secs(60));
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!times.is_empty()
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});
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ensure!(
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state.active < 2
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&& state.global.len() < 12
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&& state.peers.get(peer).is_none_or(|v| v.len() < 5),
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"Login rate limit exceeded"
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);
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state.global.push(now);
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state.peers.entry(peer.to_owned()).or_default().push(now);
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state.active += 1;
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Ok(Permit(self.clone()))
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}
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pub fn verify(&self, root: &Path, params: &Value) -> Result<Value> {
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let password = params["password"].as_str().context("Missing password")?;
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ensure!(password.len() <= 512, "密码过长");
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let _permit = self.acquire(params["peer"].as_str().unwrap_or("local"), Instant::now())?;
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let path = root.join("network-password.json");
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let snapshot = fs::read(&path)?;
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let saved: Value = serde_json::from_slice(&snapshot)?;
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let salt = hex::decode(saved["salt"].as_str().context("Missing salt")?)?;
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let expected = hex::decode(saved["hash"].as_str().context("Missing hash")?)?;
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ensure!(
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salt.len() == 16 && expected.len() == 32,
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"Invalid password record"
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);
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let mut actual = [0u8; 32];
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pbkdf2::pbkdf2_hmac::<sha2::Sha256>(password.as_bytes(), &salt, 600_000, &mut actual);
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let matches = actual
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.iter()
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.zip(&expected)
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.fold(0u8, |diff, (a, b)| diff | (a ^ b))
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== 0;
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// A password changed during verification must not authenticate with the old value.
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Ok(serde_json::json!(matches && fs::read(path)? == snapshot))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn login_limits_bound_concurrency_peers_and_reset() {
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let v = Verifier::default();
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let now = Instant::now();
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let a = v.acquire("a", now).unwrap();
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let b = v.acquire("b", now).unwrap();
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assert!(v.acquire("c", now).is_err());
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drop(a);
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drop(b);
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for _ in 0..4 {
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drop(v.acquire("a", now).unwrap());
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}
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assert!(v.acquire("a", now).is_err());
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for _ in 0..4 {
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drop(v.acquire("b", now).unwrap());
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}
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assert!(v.acquire("b", now).is_err());
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drop(v.acquire("c", now).unwrap());
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drop(v.acquire("c", now).unwrap());
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assert!(v.acquire("d", now).is_err());
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drop(v.acquire("a", now + Duration::from_secs(61)).unwrap());
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}
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}
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