Allow logging in with the full MXID

Cargo.toml

@@ -248,6 +248,10 @@ version = "0.12.12"
 default-features = false
 features = ["http2", "rustls-tls-manual-roots", "charset", "json", "socks"]
 
+# Matrix-related types
+[workspace.dependencies.ruma-common]
+version = "0.15.0"
+
 # TLS stack
 [workspace.dependencies.rustls]
 version = "0.23.21"

crates/data-model/Cargo.toml

@@ -24,7 +24,7 @@ rand.workspace = true
 rand_chacha = "0.3.1"
 regex = "1.11.1"
 woothee = "0.13.0"
-ruma-common = "0.15.0"
+ruma-common.workspace = true
 
 mas-iana.workspace = true
 mas-jose.workspace = true

crates/data-model/src/oauth2/authorization_grant.rs

@@ -17,7 +17,7 @@ use rand::{
     distributions::{Alphanumeric, DistString},
     RngCore,
 };
-use ruma_common::{OwnedUserId, UserId};
+use ruma_common::UserId;
 use serde::Serialize;
 use ulid::Ulid;
 use url::Url;
@@ -142,8 +142,8 @@ impl AuthorizationGrantStage {
     }
 }
 
-pub enum LoginHint {
-    MXID(OwnedUserId),
+pub enum LoginHint<'a> {
+    MXID(&'a UserId),
     None,
 }
 
@@ -200,7 +200,7 @@ impl AuthorizationGrant {
         match prefix {
             "mxid" => {
                 // Instead of erroring just return none
-                let Ok(mxid) = UserId::parse(value) else {
+                let Ok(mxid) = <&UserId>::try_from(value) else {
                     return LoginHint::None;
                 };
 

crates/handlers/src/compat/login.rs

@@ -386,10 +386,13 @@ async fn user_password_login(
     username: String,
     password: String,
 ) -> Result<(CompatSession, User), RouteError> {
+    // Try getting the localpart out of the MXID
+    let username = homeserver.localpart(&username).unwrap_or(&username);
+
     // Find the user
     let user = repo
         .user()
-        .find_by_username(&username)
+        .find_by_username(username)
         .await?
         .filter(mas_data_model::User::is_valid)
         .ok_or(RouteError::UserNotFound)?;
@@ -539,52 +542,43 @@ mod tests {
         assert_eq!(body["errcode"], "M_UNRECOGNIZED");
     }
 
-    /// Test that a user can login with a password using the Matrix
-    /// compatibility API.
-    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
-    async fn test_user_password_login(pool: PgPool) {
-        setup();
-        let state = TestState::from_pool(pool).await.unwrap();
-
-        // Let's provision a user and add a password to it. This part is hard to test
-        // with just HTTP requests, so we'll use the repository directly.
+    async fn user_with_password(state: &TestState, username: &str, password: &str) {
+        let mut rng = state.rng();
         let mut repo = state.repository().await.unwrap();
 
         let user = repo
             .user()
-            .add(&mut state.rng(), &state.clock, "alice".to_owned())
+            .add(&mut rng, &state.clock, username.to_owned())
+            .await
+            .unwrap();
+        let (version, hash) = state
+            .password_manager
+            .hash(&mut rng, Zeroizing::new(password.as_bytes().to_vec()))
             .await
             .unwrap();
 
+        repo.user_password()
+            .add(&mut rng, &state.clock, &user, version, hash, None)
+            .await
+            .unwrap();
         let mxid = state.homeserver_connection.mxid(&user.username);
         state
             .homeserver_connection
             .provision_user(&ProvisionRequest::new(mxid, &user.sub))
             .await
             .unwrap();
 
-        let (version, hashed_password) = state
-            .password_manager
-            .hash(
-                &mut state.rng(),
-                Zeroizing::new("password".to_owned().into_bytes()),
-            )
-            .await
-            .unwrap();
+        repo.save().await.unwrap();
+    }
 
-        repo.user_password()
-            .add(
-                &mut state.rng(),
-                &state.clock,
-                &user,
-                version,
-                hashed_password,
-                None,
-            )
-            .await
-            .unwrap();
+    /// Test that a user can login with a password using the Matrix
+    /// compatibility API.
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_user_password_login(pool: PgPool) {
+        setup();
+        let state = TestState::from_pool(pool).await.unwrap();
 
-        repo.save().await.unwrap();
+        user_with_password(&state, "alice", "password").await;
 
         // Now let's try to login with the password, without asking for a refresh token.
         let request = Request::post("/_matrix/client/v3/login").json(serde_json::json!({
@@ -662,6 +656,50 @@ mod tests {
         assert_eq!(body, old_body);
     }
 
+    /// Test that a user can login with a password using the Matrix
+    /// compatibility API, using a MXID as identifier
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_user_password_login_mxid(pool: PgPool) {
+        setup();
+        let state = TestState::from_pool(pool).await.unwrap();
+
+        user_with_password(&state, "alice", "password").await;
+
+        // Login with a full MXID as identifier
+        let request = Request::post("/_matrix/client/v3/login").json(serde_json::json!({
+            "type": "m.login.password",
+            "identifier": {
+                "type": "m.id.user",
+                "user": "@alice:example.com",
+            },
+            "password": "password",
+        }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::OK);
+        let body: ResponseBody = response.json();
+        assert!(!body.access_token.is_empty());
+        assert_eq!(body.device_id.as_ref().unwrap().as_str().len(), 10);
+        assert_eq!(body.user_id, "@alice:example.com");
+        assert_eq!(body.refresh_token, None);
+        assert_eq!(body.expires_in_ms, None);
+
+        // With a MXID, but with the wrong server name
+        let request = Request::post("/_matrix/client/v3/login").json(serde_json::json!({
+            "type": "m.login.password",
+            "identifier": {
+                "type": "m.id.user",
+                "user": "@alice:something.corp",
+            },
+            "password": "password",
+        }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::FORBIDDEN);
+        let body: serde_json::Value = response.json();
+        assert_eq!(body["errcode"], "M_FORBIDDEN");
+    }
+
     /// Test that password logins are rate limited.
     #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
     async fn test_password_login_rate_limit(pool: PgPool) {

crates/handlers/src/views/login.rs

@@ -168,14 +168,19 @@ pub(crate) async fn post(
         return Ok((cookie_jar, Html(content)).into_response());
     }
 
+    // Extract the localpart of the MXID, fallback to the bare username
+    let username = homeserver
+        .localpart(&form.username)
+        .unwrap_or(&form.username);
+
     match login(
         password_manager,
         &mut repo,
         rng,
         &clock,
         limiter,
         requester,
-        &form.username,
+        username,
         &form.password,
         user_agent,
     )
@@ -479,30 +484,34 @@ mod test {
             .contains(&escape_html(&second_provider_login.path_and_query())));
     }
 
-    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
-    async fn test_password_login(pool: PgPool) {
-        setup();
-        let state = TestState::from_pool(pool).await.unwrap();
+    async fn user_with_password(state: &TestState, username: &str, password: &str) {
         let mut rng = state.rng();
-        let cookies = CookieHelper::new();
-
-        // Provision a user with a password
         let mut repo = state.repository().await.unwrap();
         let user = repo
             .user()
-            .add(&mut rng, &state.clock, "john".to_owned())
+            .add(&mut rng, &state.clock, username.to_owned())
             .await
             .unwrap();
         let (version, hash) = state
             .password_manager
-            .hash(&mut rng, Zeroizing::new("hunter2".as_bytes().to_vec()))
+            .hash(&mut rng, Zeroizing::new(password.as_bytes().to_vec()))
             .await
             .unwrap();
         repo.user_password()
             .add(&mut rng, &state.clock, &user, version, hash, None)
             .await
             .unwrap();
         repo.save().await.unwrap();
+    }
+
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_password_login(pool: PgPool) {
+        setup();
+        let state = TestState::from_pool(pool).await.unwrap();
+        let cookies = CookieHelper::new();
+
+        // Provision a user with a password
+        user_with_password(&state, "john", "hunter2").await;
 
         // Render the login page to get a CSRF token
         let request = Request::get("/login").empty();
@@ -542,6 +551,93 @@ mod test {
         assert!(response.body().contains("john"));
     }
 
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_password_login_with_mxid(pool: PgPool) {
+        setup();
+        let state = TestState::from_pool(pool).await.unwrap();
+        let cookies = CookieHelper::new();
+
+        // Provision a user with a password
+        user_with_password(&state, "john", "hunter2").await;
+
+        // Render the login page to get a CSRF token
+        let request = Request::get("/login").empty();
+        let request = cookies.with_cookies(request);
+        let response = state.request(request).await;
+        cookies.save_cookies(&response);
+        response.assert_status(StatusCode::OK);
+        response.assert_header_value(CONTENT_TYPE, "text/html; charset=utf-8");
+        // Extract the CSRF token from the response body
+        let csrf_token = response
+            .body()
+            .split("name=\"csrf\" value=\"")
+            .nth(1)
+            .unwrap()
+            .split('\"')
+            .next()
+            .unwrap();
+
+        // Submit the login form
+        let request = Request::post("/login").form(serde_json::json!({
+            "csrf": csrf_token,
+            "username": "@john:example.com",
+            "password": "hunter2",
+        }));
+        let request = cookies.with_cookies(request);
+        let response = state.request(request).await;
+        cookies.save_cookies(&response);
+        response.assert_status(StatusCode::SEE_OTHER);
+
+        // Now if we get to the home page, we should see the user's username
+        let request = Request::get("/").empty();
+        let request = cookies.with_cookies(request);
+        let response = state.request(request).await;
+        cookies.save_cookies(&response);
+        response.assert_status(StatusCode::OK);
+        response.assert_header_value(CONTENT_TYPE, "text/html; charset=utf-8");
+        assert!(response.body().contains("john"));
+    }
+
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_password_login_with_mxid_wrong_server(pool: PgPool) {
+        setup();
+        let state = TestState::from_pool(pool).await.unwrap();
+        let cookies = CookieHelper::new();
+
+        // Provision a user with a password
+        user_with_password(&state, "john", "hunter2").await;
+
+        // Render the login page to get a CSRF token
+        let request = Request::get("/login").empty();
+        let request = cookies.with_cookies(request);
+        let response = state.request(request).await;
+        cookies.save_cookies(&response);
+        response.assert_status(StatusCode::OK);
+        response.assert_header_value(CONTENT_TYPE, "text/html; charset=utf-8");
+        // Extract the CSRF token from the response body
+        let csrf_token = response
+            .body()
+            .split("name=\"csrf\" value=\"")
+            .nth(1)
+            .unwrap()
+            .split('\"')
+            .next()
+            .unwrap();
+
+        // Submit the login form
+        let request = Request::post("/login").form(serde_json::json!({
+            "csrf": csrf_token,
+            "username": "@john:something.corp",
+            "password": "hunter2",
+        }));
+        let request = cookies.with_cookies(request);
+        let response = state.request(request).await;
+
+        // This shouldn't have worked, we're back on the login page
+        response.assert_status(StatusCode::OK);
+        assert!(response.body().contains("Invalid credentials"));
+    }
+
     #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
     async fn test_password_login_rate_limit(pool: PgPool) {
         setup();

crates/matrix/Cargo.toml

@@ -15,3 +15,4 @@ workspace = true
 anyhow.workspace = true
 async-trait.workspace = true
 tokio.workspace = true
+ruma-common.workspace = true

crates/matrix/src/lib.rs

@@ -8,6 +8,8 @@ mod mock;
 
 use std::{collections::HashSet, sync::Arc};
 
+use ruma_common::UserId;
+
 pub use self::mock::HomeserverConnection as MockHomeserverConnection;
 
 // TODO: this should probably be another error type by default
@@ -193,6 +195,22 @@ pub trait HomeserverConnection: Send + Sync {
         format!("@{}:{}", localpart, self.homeserver())
     }
 
+    /// Get the localpart of a Matrix ID if it has the right server name
+    ///
+    /// Returns [`None`] if the input isn't a valid MXID, or if the server name
+    /// doesn't match
+    ///
+    /// # Parameters
+    ///
+    /// * `mxid` - The MXID of the user
+    fn localpart<'a>(&self, mxid: &'a str) -> Option<&'a str> {
+        let mxid = <&UserId>::try_from(mxid).ok()?;
+        if mxid.server_name() != self.homeserver() {
+            return None;
+        }
+        Some(mxid.localpart())
+    }
+
     /// Query the state of a user on the homeserver.
     ///
     /// # Parameters