311 lines
11 KiB
Rust
311 lines
11 KiB
Rust
//! Fresh Community state checked against Host-pinned keys; never TOFU on refresh.
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use crate::{
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extension_package::Release,
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workspace::{hash, HostError, Result},
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};
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use base64::{engine::general_purpose::STANDARD, Engine};
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use serde::Deserialize;
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use serde_json::Value;
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use std::time::{Duration, Instant};
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pub struct Client {
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source: reqwest::Url,
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http: reqwest::Client,
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}
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pub struct Pin<'a> {
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pub source_id: &'a str,
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pub key_id: &'a str,
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pub namespace: &'a str,
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pub public_key: &'a [u8; 32],
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}
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pub struct Checked {
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source: String,
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release_hash: String,
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key_hash: String,
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checked_at: Instant,
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}
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impl Checked {
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/// Monotonic freshness avoids a wall-clock rollback extending validity.
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pub fn matches(&self, source: &str, release: &Release, key: &[u8; 32]) -> Result<()> {
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if self.checked_at.elapsed() > Duration::from_secs(30) {
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return Err(HostError::new("EXTENSION_TRUST_STALE"));
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}
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let url =
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reqwest::Url::parse(source).map_err(|_| HostError::new("EXTENSION_SOURCE_INVALID"))?;
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if url.as_str() != self.source
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|| hash(&serde_json::to_vec(release).unwrap()) != self.release_hash
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|| hash(key) != self.key_hash
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{
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return Err(HostError::new("EXTENSION_TRUST_CHANGED"));
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}
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Ok(())
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}
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}
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#[derive(Deserialize)]
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#[serde(deny_unknown_fields)]
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struct Key {
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key_id: String,
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namespace: String,
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public_key: String,
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revoked: bool,
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}
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#[derive(Deserialize)]
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#[serde(deny_unknown_fields)]
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struct Source {
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schema_version: u32,
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source_id: String,
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keys: Vec<Key>,
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}
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#[derive(Deserialize)]
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#[serde(deny_unknown_fields)]
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struct Releases {
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items: Vec<Value>,
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}
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fn unavailable() -> HostError {
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HostError::new("EXTENSION_TRUST_UNAVAILABLE")
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}
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impl Client {
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pub fn new(source: &str) -> Result<Self> {
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let mut url =
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reqwest::Url::parse(source).map_err(|_| HostError::new("EXTENSION_SOURCE_INVALID"))?;
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if url.scheme() != "https"
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|| url.host_str().is_none()
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|| !url.username().is_empty()
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|| url.password().is_some()
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|| url.query().is_some()
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|| url.fragment().is_some()
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|| source.len() > 2048
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{
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return Err(HostError::new("EXTENSION_SOURCE_INVALID"));
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}
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let path = format!("{}/", url.path().trim_end_matches('/'));
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url.set_path(&path);
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let http = reqwest::Client::builder()
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.redirect(reqwest::redirect::Policy::none())
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.timeout(Duration::from_secs(15))
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.build()
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.map_err(|_| unavailable())?;
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Ok(Self { source: url, http })
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}
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async fn json(&self, path: &str) -> Result<Value> {
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let url = self.source.join(path).map_err(|_| unavailable())?;
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let mut response = self
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.http
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.get(url)
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.header("Cache-Control", "no-cache, no-store")
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.send()
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.await
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.map_err(|_| unavailable())?;
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if response.status() != reqwest::StatusCode::OK
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|| response
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.content_length()
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.is_some_and(|n| n > 4 * 1024 * 1024)
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{
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return Err(unavailable());
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}
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let mut bytes = Vec::new();
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while let Some(chunk) = response.chunk().await.map_err(|_| unavailable())? {
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if bytes.len() + chunk.len() > 4 * 1024 * 1024 {
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return Err(unavailable());
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}
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bytes.extend_from_slice(&chunk);
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}
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serde_json::from_slice(&bytes).map_err(|_| unavailable())
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}
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pub async fn check(&self, pin: Pin<'_>, release: &Release) -> Result<Checked> {
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release.validate()?;
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let started = Instant::now();
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let source: Source = serde_json::from_value(self.json("catalog/v1/sources").await?)
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.map_err(|_| unavailable())?;
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if source.schema_version != 1
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|| source.source_id != pin.source_id
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|| source.keys.len() > 4096
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{
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return Err(HostError::new("EXTENSION_TRUST_CHANGED"));
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}
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let matching: Vec<_> = source
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.keys
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.iter()
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.filter(|k| k.key_id == pin.key_id)
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.collect();
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if matching.len() != 1 {
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return Err(HostError::new("EXTENSION_TRUST_CHANGED"));
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}
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let key = matching[0];
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if key.namespace != pin.namespace
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|| release.namespace != pin.namespace
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|| release.key_id != pin.key_id
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|| STANDARD.decode(&key.public_key).ok().as_deref() != Some(pin.public_key.as_slice())
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{
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return Err(HostError::new("EXTENSION_TRUST_CHANGED"));
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}
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if key.revoked {
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return Err(HostError::new("EXTENSION_KEY_REVOKED"));
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}
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let list: Releases = serde_json::from_value(
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self.json(&format!(
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"catalog/v1/packages/{}/{}/releases",
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release.namespace, release.package_id
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))
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.await?,
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)
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.map_err(|_| unavailable())?;
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if list.items.len() > 4096 {
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return Err(unavailable());
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}
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let mut found = Vec::new();
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for mut item in list.items {
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if item.get("version").and_then(Value::as_str) != Some(release.version.as_str()) {
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continue;
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}
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let map = item.as_object_mut().ok_or_else(unavailable)?;
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let withdrawn = map
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.remove("withdrawn")
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.and_then(|v| v.as_bool())
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.ok_or_else(unavailable)?;
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for field in ["release_id", "download_path"] {
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if map
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.remove(field)
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.and_then(|v| v.as_str().map(str::to_owned))
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.is_none()
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{
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return Err(unavailable());
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}
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}
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let remote: Release = serde_json::from_value(item).map_err(|_| unavailable())?;
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found.push((hash(&serde_json::to_vec(&remote).unwrap()), withdrawn));
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}
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let release_hash = hash(&serde_json::to_vec(release).unwrap());
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if found.len() != 1 || found[0].0 != release_hash {
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return Err(HostError::new("EXTENSION_TRUST_CHANGED"));
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}
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if found[0].1 {
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return Err(HostError::new("EXTENSION_RELEASE_WITHDRAWN"));
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}
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let checked = Checked {
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source: self.source.to_string(),
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release_hash,
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key_hash: hash(pin.public_key),
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checked_at: started,
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};
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checked.matches(self.source.as_str(), release, pin.public_key)?;
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Ok(checked)
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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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use std::{
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io::{Read, Write},
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net::TcpListener,
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};
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#[tokio::test]
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async fn live_responses_require_pinned_key_exact_release_and_no_revocation() {
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let mut fixture: Value = serde_json::from_str(include_str!(
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"../../src/services/fixtures/community-python-vector.json"
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))
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.unwrap();
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let public: [u8; 32] = STANDARD
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.decode(fixture["key"]["public_key"].as_str().unwrap())
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.unwrap()
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.try_into()
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.unwrap();
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let display = fixture["release"].clone();
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for field in ["release_id", "withdrawn", "download_path"] {
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fixture["release"].as_object_mut().unwrap().remove(field);
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}
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let release: Release = serde_json::from_value(fixture["release"].clone()).unwrap();
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for case in [
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"ok",
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"revoked",
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"rotated",
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"withdrawn",
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"changed",
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"duplicate",
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"offline",
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"redirect",
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] {
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let listener = TcpListener::bind("127.0.0.1:0").unwrap();
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let url = format!("http://{}/", listener.local_addr().unwrap());
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let mut source = json_source(&public);
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let mut remote = display.clone();
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if case == "revoked" {
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source["keys"][0]["revoked"] = true.into();
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}
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if case == "rotated" {
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source["keys"][0]["public_key"] = STANDARD.encode([9; 32]).into();
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}
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if case == "withdrawn" {
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remote["withdrawn"] = true.into();
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}
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if case == "changed" {
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remote["description"] = "changed".into();
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}
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let list = if case == "duplicate" {
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serde_json::json!({"items":[remote.clone(),remote]})
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} else {
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serde_json::json!({"items":[remote]})
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};
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let responses = if matches!(case, "revoked" | "rotated" | "offline" | "redirect") {
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vec![source]
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} else {
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vec![source, list]
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};
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let worker = std::thread::spawn(move || {
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for body in responses {
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let (mut stream, _) = listener.accept().unwrap();
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let mut bytes = [0; 8192];
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let mut count = 0;
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while !bytes[..count].windows(4).any(|w| w == b"\r\n\r\n") {
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assert!(count < bytes.len());
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let n = stream.read(&mut bytes[count..]).unwrap();
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assert!(n > 0);
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count += n;
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}
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let body = body.to_string();
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let status = match case {
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"offline" => "503 Unavailable",
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"redirect" => "302 Found",
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_ => "200 OK",
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};
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write!(stream,"HTTP/1.1 {status}\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{body}",body.len()).unwrap();
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}
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});
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let mut client = Client::new("https://catalog.example/").unwrap();
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client.source = reqwest::Url::parse(&url).unwrap();
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let result = client
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.check(
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Pin {
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source_id: "fixture",
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key_id: "test-key",
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namespace: "examples",
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public_key: &public,
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},
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&release,
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)
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.await;
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assert_eq!(result.is_ok(), case == "ok", "{case}");
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if case == "revoked" {
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assert_eq!(result.as_ref().err().unwrap().code, "EXTENSION_KEY_REVOKED");
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}
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if case == "withdrawn" {
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assert_eq!(
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result.as_ref().err().unwrap().code,
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"EXTENSION_RELEASE_WITHDRAWN"
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);
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}
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if let Ok(mut checked) = result {
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checked.matches(&url, &release, &public).unwrap();
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checked.checked_at = Instant::now() - Duration::from_secs(31);
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assert!(checked.matches(&url, &release, &public).is_err());
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}
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worker.join().unwrap();
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}
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assert!(Client::new("http://catalog.example").is_err());
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}
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fn json_source(public: &[u8; 32]) -> Value {
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serde_json::json!({"schema_version":1,"source_id":"fixture","keys":[{"key_id":"test-key","namespace":"examples","public_key":STANDARD.encode(public),"revoked":false}]})
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}
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}
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