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/*
This file is part of gnix (https://codeberg.org/metamuffin/gnix)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use crate::{
config::{return_true, DynNode},
error::ServiceError,
modules::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse},
};
use aes_gcm_siv::{
aead::{Aead, Payload},
Nonce,
};
use base64::Engine;
use bytes::Bytes;
use futures::Future;
use headers::{Cookie, HeaderMapExt};
use http_body_util::{combinators::BoxBody, BodyExt};
use hyper::{
header::{HeaderValue, LOCATION, REFERER, SET_COOKIE},
Method, Response, StatusCode,
};
use log::debug;
use percent_encoding::{percent_decode_str, percent_encode, NON_ALPHANUMERIC};
use rand::random;
use serde::Deserialize;
use serde_yml::Value;
use std::fmt::Write;
use std::{pin::Pin, sync::Arc, time::SystemTime};
use super::Credentials;
pub struct CookieAuthKind;
impl NodeKind for CookieAuthKind {
fn name(&self) -> &'static str {
"cookie_auth"
}
fn instanciate(&self, config: Value) -> anyhow::Result<Arc<dyn Node>> {
Ok(Arc::new(serde_yml::from_value::<CookieAuth>(config)?))
}
}
#[derive(Deserialize)]
pub struct CookieAuth {
users: Credentials,
expire: Option<u64>,
#[serde(default = "return_true")]
secure: bool,
next: DynNode,
fail: DynNode,
}
impl Node for CookieAuth {
fn handle<'a>(
&'a self,
context: &'a mut NodeContext,
request: NodeRequest,
) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
Box::pin(async move {
if request.method() == Method::POST && request.uri().path() == "/_gnix_login" {
let referrer = request.headers().get(REFERER).cloned();
let d = request
.into_body()
.collect()
.await
.map_err(|_| todo!())
.unwrap();
let d = String::from_utf8(d.to_bytes().to_vec()).unwrap();
// TODO proper parser
let mut username = "user";
let mut password = "";
for kv in d.split("&") {
let (key, value) = kv.split_once("=").ok_or(ServiceError::BadAuth)?;
match key {
"username" => username = value,
"password" => password = value,
_ => (),
}
}
debug!("login attempt for {username:?}");
if self.users.authentificate(username, password) {
debug!("login success via creds");
Ok(login_success_response(context, self, referrer, username))
} else {
debug!("login fail");
let mut r = Response::new(BoxBody::<_, ServiceError>::new(
String::new().clone().map_err(|_| unreachable!()),
));
*r.status_mut() = StatusCode::FOUND;
r.headers_mut()
.append(LOCATION, referrer.unwrap_or(HeaderValue::from_static("/")));
Ok(r)
}
} else {
if let Some(cookie) = request.headers().typed_get::<Cookie>() {
if let Some(auth) = cookie.get("gnix_auth") {
let username =
percent_decode_str(cookie.get("gnix_username").unwrap_or("user"))
.decode_utf8()?;
let auth = base64::engine::general_purpose::URL_SAFE.decode(auth)?;
if auth.len() < 12 {
return Err(ServiceError::BadAuth);
}
let (msg, nonce) = auth.split_at(auth.len() - 12);
let plaintext = context.state.crypto_key.decrypt(
Nonce::from_slice(nonce),
Payload {
msg,
aad: username.as_bytes(),
},
);
if let Ok(plaintext) = plaintext {
let created = u64::from_be_bytes(plaintext[0..8].try_into().unwrap());
if self
.expire
.map(|e| created + e > unix_seconds())
.unwrap_or(true)
{
debug!("valid auth for {username:?}");
return self.next.handle(context, request).await;
} else {
debug!("auth expired");
}
} else {
debug!("aead invalid");
}
} else {
debug!("no auth cookie");
}
}
debug!("fail handler");
let referrer = request.headers().get(REFERER).cloned();
let mut r = self.fail.handle(context, request).await?;
if let Some(username) = r.headers_mut().remove("gnix-auth-success") {
debug!("login success via fail handler");
if r.headers_mut().remove("gnix-auth-no-redirect").is_some() {
apply_login_success_headers(context, self, username.to_str()?, &mut r);
Ok(r)
} else {
Ok(login_success_response(
context,
self,
referrer,
username.to_str()?,
))
}
} else {
debug!("unauthorized");
*r.status_mut() = StatusCode::UNAUTHORIZED;
Ok(r)
}
}
})
}
}
fn apply_login_success_headers(
context: &mut NodeContext,
node: &CookieAuth,
username: &str,
r: &mut Response<BoxBody<Bytes, ServiceError>>,
) {
let nonce = [(); 12].map(|_| random::<u8>());
let plaintext = unix_seconds().to_be_bytes();
let mut ciphertext = context
.state
.crypto_key
.encrypt(
Nonce::from_slice(&nonce),
Payload {
msg: &plaintext,
aad: username.as_bytes(),
},
)
.unwrap();
ciphertext.extend(nonce);
let auth = base64::engine::general_purpose::URL_SAFE.encode(ciphertext);
let mut cookie_opts = String::new();
if let Some(e) = node.expire {
write!(cookie_opts, "; Max-Age={e}").unwrap();
}
if node.secure {
write!(cookie_opts, "; Secure").unwrap();
}
r.headers_mut().append(
SET_COOKIE,
HeaderValue::from_str(&format!(
"gnix_username={}{}",
percent_encode(username.as_bytes(), NON_ALPHANUMERIC),
cookie_opts
))
.unwrap(),
);
r.headers_mut().append(
SET_COOKIE,
HeaderValue::from_str(&format!("gnix_auth={}{}", auth, cookie_opts)).unwrap(),
);
}
fn login_success_response(
context: &mut NodeContext,
node: &CookieAuth,
referrer: Option<HeaderValue>,
username: &str,
) -> Response<BoxBody<Bytes, ServiceError>> {
let mut r = Response::new(BoxBody::<_, ServiceError>::new(
String::new().clone().map_err(|_| unreachable!()),
));
*r.status_mut() = StatusCode::FOUND;
r.headers_mut()
.append(LOCATION, referrer.unwrap_or(HeaderValue::from_static("/")));
apply_login_success_headers(context, node, username, &mut r);
r
}
fn unix_seconds() -> u64 {
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.unwrap()
.as_secs()
}
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