lemmy/src/session_middleware.rs

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use actix_web::{
body::MessageBody,
cookie::SameSite,
dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
http::header::{Header, CACHE_CONTROL},
Error, HttpMessage,
};
use actix_web_httpauth::headers::authorization::{Authorization, Bearer};
use chrono::{DateTime, Utc};
use core::future::Ready;
use futures_util::future::LocalBoxFuture;
use lemmy_api_common::{
context::LemmyContext, lemmy_db_views::structs::LocalUserView, utils::check_user_valid,
};
use lemmy_db_schema::newtypes::LocalUserId;
use lemmy_utils::{
claims::Claims,
error::{LemmyError, LemmyErrorExt2, LemmyErrorType},
};
use reqwest::header::HeaderValue;
use std::{future::ready, rc::Rc};
static AUTH_COOKIE_NAME: &str = "auth";
#[derive(Clone)]
pub struct SessionMiddleware {
context: LemmyContext,
}
impl SessionMiddleware {
pub fn new(context: LemmyContext) -> Self {
SessionMiddleware { context }
}
}
impl<S, B> Transform<S, ServiceRequest> for SessionMiddleware
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
S::Future: 'static,
B: MessageBody + 'static,
{
type Response = ServiceResponse<B>;
type Error = Error;
type Transform = SessionService<S>;
type InitError = ();
type Future = Ready<Result<Self::Transform, Self::InitError>>;
fn new_transform(&self, service: S) -> Self::Future {
ready(Ok(SessionService {
service: Rc::new(service),
context: self.context.clone(),
}))
}
}
pub struct SessionService<S> {
service: Rc<S>,
context: LemmyContext,
}
impl<S, B> Service<ServiceRequest> for SessionService<S>
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
S::Future: 'static,
B: 'static,
{
type Response = ServiceResponse<B>;
type Error = Error;
type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
forward_ready!(service);
fn call(&self, req: ServiceRequest) -> Self::Future {
let svc = self.service.clone();
let context = self.context.clone();
Box::pin(async move {
let auth_header = Authorization::<Bearer>::parse(&req).ok();
let jwt = if let Some(a) = auth_header {
Some(a.as_ref().token().to_string())
}
// If that fails, try auth cookie. Dont use the `jwt` cookie from lemmy-ui because
// its not http-only.
else {
let auth_cookie = req.cookie(AUTH_COOKIE_NAME);
if let Some(a) = &auth_cookie {
// ensure that its marked as httponly and secure
let secure = a.secure().unwrap_or_default();
let http_only = a.http_only().unwrap_or_default();
let same_site = a.same_site();
if !secure || !http_only || same_site != Some(SameSite::Strict) {
return Err(LemmyError::from(LemmyErrorType::AuthCookieInsecure).into());
}
}
auth_cookie.map(|c| c.value().to_string())
};
if let Some(jwt) = &jwt {
// Ignore any invalid auth so the site can still be used
// TODO: this means it will be impossible to get any error message for invalid jwt. Need
// to add a separate endpoint for that.
// https://github.com/LemmyNet/lemmy/issues/3702
let local_user_view = local_user_view_from_jwt(jwt, &context).await.ok();
if let Some(local_user_view) = local_user_view {
req.extensions_mut().insert(local_user_view);
}
}
let mut res = svc.call(req).await?;
// Add cache-control header. If user is authenticated, mark as private. Otherwise cache
// up to one minute.
let cache_value = if jwt.is_some() {
"private"
} else {
"public, max-age=60"
};
res
.headers_mut()
.insert(CACHE_CONTROL, HeaderValue::from_static(cache_value));
Ok(res)
})
}
}
#[tracing::instrument(skip_all)]
async fn local_user_view_from_jwt(
jwt: &str,
context: &LemmyContext,
) -> Result<LocalUserView, LemmyError> {
let claims = Claims::decode(jwt, &context.secret().jwt_secret)
.with_lemmy_type(LemmyErrorType::NotLoggedIn)?
.claims;
let local_user_id = LocalUserId(claims.sub);
let local_user_view = LocalUserView::read(&mut context.pool(), local_user_id).await?;
check_user_valid(
local_user_view.person.banned,
local_user_view.person.ban_expires,
local_user_view.person.deleted,
)?;
check_validator_time(&local_user_view.local_user.validator_time, &claims)?;
Ok(local_user_view)
}
/// Checks if user's token was issued before user's password reset.
fn check_validator_time(validator_time: &DateTime<Utc>, claims: &Claims) -> Result<(), LemmyError> {
let user_validation_time = validator_time.timestamp();
if user_validation_time > claims.iat {
Err(LemmyErrorType::NotLoggedIn)?
} else {
Ok(())
}
}
#[cfg(test)]
mod tests {
#![allow(clippy::unwrap_used)]
#![allow(clippy::indexing_slicing)]
use super::*;
use lemmy_db_schema::{
source::{
instance::Instance,
local_user::{LocalUser, LocalUserInsertForm},
person::{Person, PersonInsertForm},
secret::Secret,
},
traits::Crud,
utils::build_db_pool_for_tests,
};
use lemmy_utils::{claims::Claims, settings::SETTINGS};
use serial_test::serial;
use std::env;
#[tokio::test]
#[serial]
async fn test_session_auth() {
let pool = &build_db_pool_for_tests().await;
let pool = &mut pool.into();
let secret = Secret::init(pool).await.unwrap();
// test.sh sets `LEMMY_CONFIG_LOCATION=../../config/config.hjson` for code under crates folder.
// this results in a config not found error, so we need to unset this var and use default.
env::remove_var("LEMMY_CONFIG_LOCATION");
let settings = &SETTINGS.to_owned();
let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
.await
.unwrap();
let new_person = PersonInsertForm::builder()
.name("Gerry9812".into())
.public_key("pubkey".to_string())
.instance_id(inserted_instance.id)
.build();
let inserted_person = Person::create(pool, &new_person).await.unwrap();
let local_user_form = LocalUserInsertForm::builder()
.person_id(inserted_person.id)
.password_encrypted("123456".to_string())
.build();
let inserted_local_user = LocalUser::create(pool, &local_user_form).await.unwrap();
let jwt = Claims::jwt(
inserted_local_user.id.0,
&secret.jwt_secret,
&settings.hostname,
)
.unwrap();
let claims = Claims::decode(&jwt, &secret.jwt_secret).unwrap().claims;
let check = check_validator_time(&inserted_local_user.validator_time, &claims);
assert!(check.is_ok());
// The check should fail, since the validator time is now newer than the jwt issue time
let updated_local_user =
LocalUser::update_password(pool, inserted_local_user.id, "password111")
.await
.unwrap();
let check_after = check_validator_time(&updated_local_user.validator_time, &claims);
assert!(check_after.is_err());
let num_deleted = Person::delete(pool, inserted_person.id).await.unwrap();
assert_eq!(1, num_deleted);
}
}