71e7fd8b20
The loopback listener served one connection at a time with no read timeout, so a connection that never sent a request (a browser preconnect, any local process) held up the real form_post until the 5-minute wait ran out. Each connection now runs on its own task and the first final answer wins. The callback body is capped at 16 KiB; over the cap it reads as empty and can't complete the login. A request the gateway answers 401 now triggers one refresh (under the cache lock, skipped if another process already replaced the refused token) and one retry; a second 401 says to run `swarmctl login`. The login cache directory is a `Swarm` field so tests can point it at a scratch directory. New tests: an idle connection does not block the real callback; an oversized body is refused without ending the wait; two concurrent refreshers refresh once and share the token; a refused token is refreshed once and retried; a second 401 says to log in without a further retry; with no `--swarm`, the verbs use the controller socket.
607 lines
23 KiB
Rust
607 lines
23 KiB
Rust
//! Reaching swarm-controller through the swarm domain's gateway instead of its
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//! unix socket, as the operator's own SSO account.
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//!
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//! The gateway's `/api/` location runs authelia's `auth_request` and accepts an
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//! OAuth 2.0 bearer token in place of a session cookie. `swarmctl login`
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//! ([`crate::login`]) obtains one for the public `swarmctl` client and this
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//! module caches it, refreshes it and presents it.
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//!
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//! ⚠️ authelia **rotates** the refresh token on every use, and presenting an
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//! already-used one revokes the whole login. Every refresh therefore runs under
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//! an exclusive lock on the cache, and rereads the cache once it holds it.
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use std::fs::{self, DirBuilder, File, OpenOptions};
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use std::io::Write as _;
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use std::os::unix::fs::{DirBuilderExt as _, OpenOptionsExt as _};
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use std::path::{Path, PathBuf};
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use anyhow::{Context as _, Result, anyhow, bail};
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use serde::{Deserialize, Serialize};
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/// Registered under the same id in `swarm-authelia.nix`.
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pub(crate) const CLIENT_ID: &str = "swarmctl";
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/// Refresh this long before the access token's stated expiry, so a token
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/// doesn't lapse between the check and the gateway's look at it.
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const EXPIRY_MARGIN_SECS: i64 = 60;
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/// Where a controller request goes.
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pub(crate) enum Target {
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/// swarm-controller's unix socket on this host.
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Socket(PathBuf),
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/// The swarm domain's gateway, with the cached login.
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Swarm(Swarm),
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}
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/// A swarm reached by its domain.
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pub(crate) struct Swarm {
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/// `https://<swarm domain>`, with no path.
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pub origin: url::Url,
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/// A PEM CA certificate to trust beside the system roots.
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pub ca_file: Option<PathBuf>,
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/// Where the login cache lives: `$XDG_STATE_HOME/swarmctl` by default.
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pub state_dir: PathBuf,
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}
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impl Swarm {
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pub(crate) fn parse(url: &str, ca_file: Option<PathBuf>, state_dir: PathBuf) -> Result<Self> {
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let parsed =
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url::Url::parse(url).with_context(|| format!("--swarm {url:?} is not a URL"))?;
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if parsed.scheme() != "https" || parsed.host_str().is_none() {
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bail!("--swarm {url:?} must be an https:// URL naming the swarm's domain");
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}
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let origin = url::Url::parse(&parsed.origin().ascii_serialization())
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.context("re-parsing the swarm's origin")?;
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Ok(Self {
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origin,
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ca_file,
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state_dir,
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})
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}
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/// What the token must name for the gateway to admit it at `/api/`.
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/// authelia matches it as a URL prefix.
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pub(crate) fn audience(&self) -> String {
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format!("{}api/", self.origin)
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}
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/// An HTTP client that never follows a redirect: from the gateway one
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/// means "log in", and following it would land on the login page.
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pub(crate) fn http(&self) -> Result<reqwest::Client> {
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let mut builder = reqwest::Client::builder().redirect(reqwest::redirect::Policy::none());
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if let Some(path) = &self.ca_file {
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let pem = fs::read(path)
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.with_context(|| format!("reading the CA certificate {}", path.display()))?;
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let cert = reqwest::Certificate::from_pem(&pem)
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.with_context(|| format!("parsing {} as a PEM certificate", path.display()))?;
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builder = builder.add_root_certificate(cert);
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}
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builder.build().context("building the HTTPS client")
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}
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pub(crate) fn cache_path(&self) -> PathBuf {
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let host = self.origin.host_str().unwrap_or_default();
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let name = match self.origin.port() {
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Some(port) => format!("{host}_{port}.json"),
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None => format!("{host}.json"),
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};
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self.state_dir.join(name)
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}
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fn not_logged_in(&self) -> String {
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format!(
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"not logged in to {} — run `swarmctl --swarm {} login`",
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self.origin, self.origin
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)
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}
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/// One request to `uri` (a path under the origin) with the cached login.
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/// A 401 is answered by one refresh and one retry; a second 401 means the
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/// login itself is gone.
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pub(crate) async fn request(
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&self,
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method: hyper::Method,
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uri: &str,
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body: Option<Vec<u8>>,
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what: &str,
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) -> Result<(hyper::StatusCode, bytes::Bytes)> {
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self.request_with(&self.http()?, method, uri, body, what)
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.await
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}
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async fn request_with(
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&self,
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http: &reqwest::Client,
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method: hyper::Method,
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uri: &str,
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body: Option<Vec<u8>>,
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what: &str,
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) -> Result<(hyper::StatusCode, bytes::Bytes)> {
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let url = self.origin.join(uri).context("joining the request path")?;
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let send = |token: String| {
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let mut req = http.request(method.clone(), url.clone()).bearer_auth(token);
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if let Some(body) = &body {
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req = req
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.header(reqwest::header::CONTENT_TYPE, "application/json")
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.body(body.clone());
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}
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req.send()
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};
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let context = || format!("sending the {what} request to {}", self.origin);
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let token = self.access_token(http, None).await?;
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let mut resp = send(token.clone()).await.with_context(context)?;
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if resp.status() == reqwest::StatusCode::UNAUTHORIZED {
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let fresh = self.access_token(http, Some(&token)).await?;
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resp = send(fresh).await.with_context(context)?;
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}
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let status = resp.status();
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if status == reqwest::StatusCode::UNAUTHORIZED {
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bail!(
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"{} refused the cached login (401). {}",
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self.origin,
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self.not_logged_in()
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);
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}
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if status.is_redirection() {
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bail!(
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"{} answered {status} instead of the controller's response; its `/api/` \
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did not accept a bearer token",
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self.origin
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);
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}
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let body = resp.bytes().await.context("reading the response")?;
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Ok((status, body))
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}
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/// The cached access token, refreshed first if it is about to expire or is
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/// `rejected`, the one the gateway just refused.
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async fn access_token(&self, http: &reqwest::Client, rejected: Option<&str>) -> Result<String> {
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let path = self.cache_path();
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let now = chrono::Utc::now().timestamp();
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let due = |c: &Cached| needs_refresh(c, now) || rejected == Some(c.access_token.as_str());
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let cached = read_cache(&path)?.with_context(|| self.not_logged_in())?;
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if !due(&cached) {
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return Ok(cached.access_token);
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}
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let _lock = lock(&path)?;
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// Another process may have refreshed while this one waited for the lock.
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let cached = read_cache(&path)?.with_context(|| self.not_logged_in())?;
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if !due(&cached) {
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return Ok(cached.access_token);
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}
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let token = token_request(
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http,
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&cached.auth,
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&[
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("grant_type", "refresh_token"),
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("client_id", CLIENT_ID),
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("refresh_token", &cached.refresh_token),
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],
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)
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.await
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.with_context(|| format!("refreshing the login. {}", self.not_logged_in()))?;
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let fresh = refreshed(cached, token, now);
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write_cache(&path, &fresh)?;
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Ok(fresh.access_token)
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}
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}
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/// `$XDG_STATE_HOME/swarmctl`, else `~/.local/state/swarmctl`.
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pub(crate) fn state_dir() -> Result<PathBuf> {
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std::env::var_os("XDG_STATE_HOME")
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.map(PathBuf::from)
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.or_else(|| std::env::var_os("HOME").map(|h| PathBuf::from(h).join(".local/state")))
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.map(|state| state.join("swarmctl"))
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.context("neither XDG_STATE_HOME nor HOME is set, so there is nowhere to keep the login")
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}
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/// The token cache: one file per swarm, mode 0600, in a 0700 directory.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub(crate) struct Cached {
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/// authelia's origin, where the refresh goes.
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pub auth: String,
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pub access_token: String,
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pub refresh_token: String,
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/// Unix seconds.
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pub expires_at: i64,
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}
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/// authelia's token endpoint answer.
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#[derive(Deserialize)]
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pub(crate) struct TokenResponse {
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pub access_token: String,
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pub expires_in: i64,
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pub refresh_token: Option<String>,
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}
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pub(crate) fn needs_refresh(cached: &Cached, now: i64) -> bool {
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cached.expires_at - EXPIRY_MARGIN_SECS <= now
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}
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/// The cache after a refresh. The new refresh token replaces the old one,
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/// which is dead from the moment it was used.
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pub(crate) fn refreshed(cached: Cached, token: TokenResponse, now: i64) -> Cached {
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Cached {
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refresh_token: token.refresh_token.unwrap_or(cached.refresh_token),
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access_token: token.access_token,
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expires_at: now + token.expires_in,
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auth: cached.auth,
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}
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}
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/// POST a form to authelia's token endpoint.
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pub(crate) async fn token_request(
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http: &reqwest::Client,
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auth: &str,
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form: &[(&str, &str)],
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) -> Result<TokenResponse> {
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let resp = http
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.post(format!("{auth}/api/oidc/token"))
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.form(form)
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.send()
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.await
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.with_context(|| format!("calling {auth}/api/oidc/token"))?;
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oauth_json(resp).await
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}
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/// Decode an OAuth 2.0 JSON answer, or turn its `error` into the message.
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pub(crate) async fn oauth_json<T: serde::de::DeserializeOwned>(
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resp: reqwest::Response,
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) -> Result<T> {
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let status = resp.status();
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let body = resp.bytes().await.context("reading authelia's response")?;
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if !status.is_success() {
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let v: serde_json::Value = serde_json::from_slice(&body).unwrap_or_default();
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let field = |k| v.get(k).and_then(serde_json::Value::as_str).unwrap_or("");
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return Err(anyhow!(
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"authelia answered {status}: {} {}",
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field("error"),
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field("error_description")
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));
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}
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serde_json::from_slice(&body).context("decoding authelia's response")
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}
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pub(crate) fn read_cache(path: &Path) -> Result<Option<Cached>> {
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match fs::read(path) {
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Ok(bytes) => serde_json::from_slice(&bytes)
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.map(Some)
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.with_context(|| format!("decoding the login cache {}", path.display())),
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Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(None),
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Err(e) => Err(e).with_context(|| format!("reading the login cache {}", path.display())),
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}
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}
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/// Write through a 0600 temp file and rename, so the tokens are never
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/// readable by anyone else, not even for the moment between create and chmod.
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pub(crate) fn write_cache(path: &Path, cached: &Cached) -> Result<()> {
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let dir = path
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.parent()
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.context("the login cache path has no directory")?;
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DirBuilder::new()
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.recursive(true)
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.mode(0o700)
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.create(dir)
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.with_context(|| format!("creating {}", dir.display()))?;
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let tmp = path.with_extension("json.tmp");
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let _ = fs::remove_file(&tmp);
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let mut file = OpenOptions::new()
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.write(true)
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.create_new(true)
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.mode(0o600)
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.open(&tmp)
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.with_context(|| format!("creating {}", tmp.display()))?;
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file.write_all(&serde_json::to_vec(cached)?)
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.and_then(|()| file.sync_all())
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.with_context(|| format!("writing {}", tmp.display()))?;
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fs::rename(&tmp, path).with_context(|| format!("replacing {}", path.display()))
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}
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/// Hold an exclusive lock beside the cache until the returned file drops.
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pub(crate) fn lock(path: &Path) -> Result<File> {
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if let Some(dir) = path.parent() {
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DirBuilder::new().recursive(true).mode(0o700).create(dir)?;
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}
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let lock_path = path.with_extension("lock");
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let file = OpenOptions::new()
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.create(true)
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.truncate(false)
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.write(true)
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.mode(0o600)
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.open(&lock_path)
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.with_context(|| format!("opening {}", lock_path.display()))?;
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rustix::fs::flock(&file, rustix::fs::FlockOperation::LockExclusive)
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.with_context(|| format!("locking {}", lock_path.display()))?;
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Ok(file)
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}
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#[cfg(test)]
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mod tests {
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use std::os::unix::fs::PermissionsExt as _;
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use std::sync::{Arc, Mutex};
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use super::*;
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fn cached(expires_at: i64) -> Cached {
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Cached {
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auth: "https://auth.example.test".into(),
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access_token: "at-old".into(),
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refresh_token: "rt-old".into(),
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expires_at,
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}
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}
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#[test]
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fn a_token_is_refreshed_only_inside_the_margin() {
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assert!(!needs_refresh(
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&cached(1_000),
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1_000 - EXPIRY_MARGIN_SECS - 1
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));
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assert!(needs_refresh(&cached(1_000), 1_000 - EXPIRY_MARGIN_SECS));
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assert!(needs_refresh(&cached(1_000), 2_000));
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}
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/// authelia rotates the refresh token; keeping the used one would make
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/// the next refresh revoke the whole login.
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#[test]
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fn a_refresh_replaces_both_tokens_and_the_expiry() {
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let token = TokenResponse {
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access_token: "at-new".into(),
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expires_in: 3599,
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refresh_token: Some("rt-new".into()),
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};
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let fresh = refreshed(cached(0), token, 5_000);
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assert_eq!(fresh.access_token, "at-new");
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assert_eq!(fresh.refresh_token, "rt-new");
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assert_eq!(fresh.expires_at, 8_599);
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assert_eq!(fresh.auth, "https://auth.example.test");
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}
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#[test]
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fn the_cache_is_written_owner_only_and_reads_back() {
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let dir = std::env::temp_dir().join(format!("swarmctl-cache-{}", std::process::id()));
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let path = dir.join("swarmctl").join("swarm.example.test.json");
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let _ = fs::remove_dir_all(&dir);
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assert_eq!(read_cache(&path).expect("missing is not an error"), None);
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write_cache(&path, &cached(42)).expect("writes");
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write_cache(&path, &cached(43)).expect("overwrites");
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let mode = |p: &Path| fs::metadata(p).expect("stat").permissions().mode() & 0o777;
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assert_eq!(mode(&path), 0o600);
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assert_eq!(mode(path.parent().expect("dir")), 0o700);
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assert_eq!(read_cache(&path).expect("reads"), Some(cached(43)));
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fs::remove_dir_all(&dir).expect("cleanup");
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}
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#[test]
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fn the_audience_is_the_api_prefix_of_the_origin() {
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let swarm = Swarm::parse("https://swarm.example.test/some/page", None, "/s".into())
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.expect("parses");
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assert_eq!(swarm.audience(), "https://swarm.example.test/api/");
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assert!(Swarm::parse("http://swarm.example.test", None, "/s".into()).is_err());
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}
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|
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/// authelia's token endpoint and the gateway's `/api/`, as far as these
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/// tests need them: a refresh rotates both tokens, a used refresh token
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/// revokes the login (as authelia does), and `/api/` admits only the
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/// current access token.
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struct Mock {
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refresh: Option<String>,
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access: Option<String>,
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refreshes: u32,
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api_calls: u32,
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api_refuses_all: bool,
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}
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fn mock() -> Arc<Mutex<Mock>> {
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Arc::new(Mutex::new(Mock {
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refresh: Some("rt-0".into()),
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access: Some("at-0".into()),
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refreshes: 0,
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api_calls: 0,
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api_refuses_all: false,
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}))
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}
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|
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/// Serve `mock` on a loopback port from its own thread, so callers on
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/// other threads can block on the cache lock without stalling it.
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|
fn serve(mock: &Arc<Mutex<Mock>>) -> url::Url {
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|
let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
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let addr = listener.local_addr().expect("addr");
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listener.set_nonblocking(true).expect("nonblocking");
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let mock = Arc::clone(mock);
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std::thread::spawn(move || {
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let rt = tokio::runtime::Builder::new_current_thread()
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.enable_all()
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|
.build()
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|
.expect("runtime");
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|
rt.block_on(async move {
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|
let listener = tokio::net::TcpListener::from_std(listener).expect("listener");
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loop {
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let (stream, _) = listener.accept().await.expect("accept");
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let mock = Arc::clone(&mock);
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tokio::spawn(async move {
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|
let service = hyper::service::service_fn(move |req| {
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let mock = Arc::clone(&mock);
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async move { Ok::<_, std::convert::Infallible>(answer(&mock, req).await) }
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});
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|
let _ = hyper::server::conn::http1::Builder::new()
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|
.serve_connection(hyper_util::rt::TokioIo::new(stream), service)
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.await;
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});
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}
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});
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});
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|
url::Url::parse(&format!("http://{addr}/")).expect("url")
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|
}
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|
async fn answer(
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|
mock: &Mutex<Mock>,
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|
req: hyper::Request<hyper::body::Incoming>,
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|
) -> hyper::Response<http_body_util::Full<bytes::Bytes>> {
|
|
use http_body_util::BodyExt as _;
|
|
let reply = |status: u16, body: serde_json::Value| {
|
|
hyper::Response::builder()
|
|
.status(status)
|
|
.body(http_body_util::Full::new(body.to_string().into()))
|
|
.expect("response")
|
|
};
|
|
let path = req.uri().path().to_owned();
|
|
let bearer = req
|
|
.headers()
|
|
.get(hyper::header::AUTHORIZATION)
|
|
.and_then(|v| v.to_str().ok())
|
|
.and_then(|v| v.strip_prefix("Bearer "))
|
|
.map(str::to_owned);
|
|
let body = req.into_body().collect().await.expect("body").to_bytes();
|
|
if path == "/api/oidc/token" {
|
|
// Wide enough that two unlocked refreshers are both in flight.
|
|
tokio::time::sleep(std::time::Duration::from_millis(200)).await;
|
|
let presented = url::form_urlencoded::parse(&body)
|
|
.find(|(k, _)| k == "refresh_token")
|
|
.map(|(_, v)| v.into_owned());
|
|
let mut m = mock.lock().expect("mock");
|
|
if presented.is_none() || presented != m.refresh {
|
|
m.refresh = None;
|
|
m.access = None;
|
|
return reply(400, serde_json::json!({ "error": "invalid_grant" }));
|
|
}
|
|
m.refreshes += 1;
|
|
m.access = Some(format!("at-{}", m.refreshes));
|
|
m.refresh = Some(format!("rt-{}", m.refreshes));
|
|
return reply(
|
|
200,
|
|
serde_json::json!({
|
|
"access_token": m.access, "refresh_token": m.refresh, "expires_in": 3600,
|
|
}),
|
|
);
|
|
}
|
|
let mut m = mock.lock().expect("mock");
|
|
m.api_calls += 1;
|
|
if !m.api_refuses_all && bearer.is_some() && bearer == m.access {
|
|
reply(200, serde_json::json!({ "ok": true }))
|
|
} else {
|
|
reply(401, serde_json::json!({}))
|
|
}
|
|
}
|
|
|
|
fn scratch(name: &str) -> PathBuf {
|
|
let dir = std::env::temp_dir().join(format!("swarmctl-{name}-{}", std::process::id()));
|
|
let _ = fs::remove_dir_all(&dir);
|
|
dir
|
|
}
|
|
|
|
/// A swarm whose API and authelia are both `origin`, with a cached login.
|
|
fn logged_in(origin: &url::Url, dir: &Path, access_token: &str, expires_at: i64) -> Swarm {
|
|
let swarm = Swarm {
|
|
origin: origin.clone(),
|
|
ca_file: None,
|
|
state_dir: dir.to_owned(),
|
|
};
|
|
let cache = Cached {
|
|
auth: origin.as_str().trim_end_matches('/').to_owned(),
|
|
access_token: access_token.into(),
|
|
refresh_token: "rt-0".into(),
|
|
expires_at,
|
|
};
|
|
write_cache(&swarm.cache_path(), &cache).expect("cache");
|
|
swarm
|
|
}
|
|
|
|
/// Plain HTTP only: no system roots, which the build sandbox doesn't have.
|
|
fn client() -> reqwest::Client {
|
|
reqwest::Client::builder()
|
|
.tls_certs_only([])
|
|
.build()
|
|
.expect("client")
|
|
}
|
|
|
|
fn block_on<T>(fut: impl std::future::Future<Output = T>) -> T {
|
|
tokio::runtime::Builder::new_current_thread()
|
|
.enable_all()
|
|
.build()
|
|
.expect("runtime")
|
|
.block_on(fut)
|
|
}
|
|
|
|
/// Two refreshers on one expired cache, as two `swarmctl` processes would
|
|
/// be: one refresh, and both get the token it issued. Without the lock
|
|
/// and the reread under it, the second presents the used refresh token
|
|
/// and authelia revokes the login.
|
|
#[test]
|
|
fn concurrent_refreshers_refresh_once_and_share_the_token() {
|
|
let mock = mock();
|
|
let origin = serve(&mock);
|
|
let dir = scratch("concurrent");
|
|
logged_in(&origin, &dir, "at-0", 0);
|
|
|
|
let start = Arc::new(std::sync::Barrier::new(2));
|
|
let refreshers: Vec<_> = (0..2)
|
|
.map(|_| {
|
|
let swarm = Swarm {
|
|
origin: origin.clone(),
|
|
ca_file: None,
|
|
state_dir: dir.clone(),
|
|
};
|
|
let start = Arc::clone(&start);
|
|
std::thread::spawn(move || {
|
|
let http = client();
|
|
start.wait();
|
|
block_on(swarm.access_token(&http, None))
|
|
})
|
|
})
|
|
.collect();
|
|
let tokens: Vec<String> = refreshers
|
|
.into_iter()
|
|
.map(|r| r.join().expect("thread").expect("refreshed"))
|
|
.collect();
|
|
|
|
let m = mock.lock().expect("mock");
|
|
assert_eq!(m.refreshes, 1);
|
|
assert_eq!(tokens, ["at-1", "at-1"]);
|
|
assert_eq!(m.access.as_deref(), Some("at-1"), "the login is still live");
|
|
fs::remove_dir_all(&dir).expect("cleanup");
|
|
}
|
|
|
|
/// The clock says the token is good and the gateway refuses it: refresh
|
|
/// once and retry.
|
|
#[test]
|
|
fn a_refused_token_is_refreshed_once_and_the_request_retried() {
|
|
let mock = mock();
|
|
let origin = serve(&mock);
|
|
let dir = scratch("retry");
|
|
let swarm = logged_in(&origin, &dir, "at-revoked", i64::MAX / 2);
|
|
|
|
let (status, _) =
|
|
block_on(swarm.request_with(&client(), hyper::Method::GET, "/api/x", None, "x"))
|
|
.expect("the retry succeeds");
|
|
assert_eq!(status, hyper::StatusCode::OK);
|
|
let m = mock.lock().expect("mock");
|
|
assert_eq!((m.refreshes, m.api_calls), (1, 2));
|
|
drop(m);
|
|
let cached = read_cache(&swarm.cache_path())
|
|
.expect("read")
|
|
.expect("cache");
|
|
assert_eq!(cached.access_token, "at-1");
|
|
fs::remove_dir_all(&dir).expect("cleanup");
|
|
}
|
|
|
|
/// A 401 after the refresh means the login itself is gone: say so, once.
|
|
#[test]
|
|
fn a_second_401_says_to_log_in_and_does_not_retry_again() {
|
|
let mock = mock();
|
|
mock.lock().expect("mock").api_refuses_all = true;
|
|
let origin = serve(&mock);
|
|
let dir = scratch("refused");
|
|
let swarm = logged_in(&origin, &dir, "at-0", i64::MAX / 2);
|
|
|
|
let err = block_on(swarm.request_with(&client(), hyper::Method::GET, "/api/x", None, "x"))
|
|
.expect_err("still refused")
|
|
.to_string();
|
|
assert!(err.contains("(401)") && err.contains("login`"), "{err}");
|
|
let m = mock.lock().expect("mock");
|
|
assert_eq!((m.refreshes, m.api_calls), (1, 2));
|
|
fs::remove_dir_all(&dir).expect("cleanup");
|
|
}
|
|
}
|