irc: send ERR_SASLFAIL reply for auth fails (#30)

Reviewed-on: lavina/lavina#30
Co-authored-by: G1ng3r <saynulanude@gmail.com>
Co-committed-by: G1ng3r <saynulanude@gmail.com>

crates/projection-irc/src/lib.rs

@@ -180,14 +180,16 @@ async fn handle_registration<'a>(
                     writer.flush().await?;
                 }
                 CapabilitySubcommand::End => {
-                    let Some((username, realname)) = future_username else {
+                    let Some((ref username, ref realname)) = future_username else {
-                        todo!()
+                        todo!();
                     };
                     let Some(nickname) = future_nickname.clone() else {
-                        todo!()
+                        todo!();
                     };
+                    let username = username.clone();
+                    let realname = realname.clone();
                     let candidate_user = RegisteredUser {
-                        nickname,
+                        nickname: nickname.clone(),
                         username,
                         realname,
                     };
@@ -197,7 +199,15 @@ async fn handle_registration<'a>(
                         break Ok(candidate_user);
                     } else {
                         let Some(candidate_password) = pass else {
-                            todo!();
+                            sasl_fail_message(
+                                config.server_name.clone(),
+                                nickname.clone(),
+                                "User credentials was not provided".into(),
+                            )
+                            .write_async(writer)
+                            .await?;
+                            writer.flush().await?;
+                            continue;
                         };
                         auth_user(storage, &*candidate_user.nickname, &*candidate_password).await?;
                         break Ok(candidate_user);
@@ -209,12 +219,20 @@ async fn handle_registration<'a>(
                     future_nickname = Some(nickname);
                 } else if let Some((username, realname)) = future_username.clone() {
                     let candidate_user = RegisteredUser {
-                        nickname,
+                        nickname: nickname.clone(),
                         username,
                         realname,
                     };
                     let Some(candidate_password) = pass else {
-                        todo!();
+                        sasl_fail_message(
+                            config.server_name.clone(),
+                            nickname.clone(),
+                            "User credentials was not provided".into(),
+                        )
+                        .write_async(writer)
+                        .await?;
+                        writer.flush().await?;
+                        continue;
                     };
                     auth_user(storage, &*candidate_user.nickname, &*candidate_password).await?;
                     break Ok(candidate_user);
@@ -227,12 +245,20 @@ async fn handle_registration<'a>(
                     future_username = Some((username, realname));
                 } else if let Some(nickname) = future_nickname.clone() {
                     let candidate_user = RegisteredUser {
-                        nickname,
+                        nickname: nickname.clone(),
                         username,
                         realname,
                     };
                     let Some(candidate_password) = pass else {
-                        todo!();
+                        sasl_fail_message(
+                            config.server_name.clone(),
+                            nickname.clone(),
+                            "User credentials was not provided".into(),
+                        )
+                        .write_async(writer)
+                        .await?;
+                        writer.flush().await?;
+                        continue;
                     };
                     auth_user(storage, &*candidate_user.nickname, &*candidate_password).await?;
                     break Ok(candidate_user);
@@ -255,12 +281,31 @@ async fn handle_registration<'a>(
                         .await?;
                         writer.flush().await?;
                     } else {
-                        // TODO respond with 904
+                        if let Some(nickname) = future_nickname.clone() {
-                        todo!();
+                            sasl_fail_message(
+                                config.server_name.clone(),
+                                nickname.clone(),
+                                "Unsupported mechanism".into(),
+                            )
+                            .write_async(writer)
+                            .await?;
+                            writer.flush().await?;
+                        } else {
+                            break Err(anyhow::Error::msg("Wrong authentication sequence"));
+                        }
                     }
                 } else {
                     let body = AuthBody::from_str(body.as_bytes())?;
-                    auth_user(storage, &body.login, &body.password).await?;
+                    if let Err(e) = auth_user(storage, &body.login, &body.password).await {
+                        tracing::warn!("Authentication failed: {:?}", e);
+                        if let Some(nickname) = future_nickname.clone() {
+                            sasl_fail_message(config.server_name.clone(), nickname.clone(), "Bad credentials".into())
+                                .write_async(writer)
+                                .await?;
+                            writer.flush().await?;
+                        } else {
+                        }
+                    } else {
                         let login: Str = body.login.into();
                         validated_user = Some(login.clone());
                         ServerMessage {
@@ -287,6 +332,8 @@ async fn handle_registration<'a>(
                         .await?;
                         writer.flush().await?;
                     }
+                }
+
                 // TODO handle abortion of authentication
             }
             _ => {}
@@ -297,6 +344,14 @@ async fn handle_registration<'a>(
     Ok(user)
 }
 
+fn sasl_fail_message(sender: Str, nick: Str, text: Str) -> ServerMessage {
+    ServerMessage {
+        tags: vec![],
+        sender: Some(sender),
+        body: ServerMessageBody::N904SaslFail { nick, text },
+    }
+}
+
 async fn auth_user(storage: &mut Storage, login: &str, plain_password: &str) -> Result<()> {
     let stored_user = storage.retrieve_user_by_name(login).await?;
 

crates/projection-irc/tests/lib.rs

@@ -218,3 +218,51 @@ async fn scenario_cap_short_negotiation() -> Result<()> {
     server.server.terminate().await?;
     Ok(())
 }
+
+#[tokio::test]
+async fn scenario_cap_sasl_fail() -> Result<()> {
+    let mut server = TestServer::start().await?;
+
+    // test scenario
+
+    server.storage.create_user("tester").await?;
+    server.storage.set_password("tester", "password").await?;
+
+    let mut stream = TcpStream::connect(server.server.addr).await?;
+    let mut s = TestScope::new(&mut stream);
+
+    s.send("CAP LS 302").await?;
+    s.send("NICK tester").await?;
+    s.send("USER UserName 0 * :Real Name").await?;
+    s.expect(":testserver CAP * LS :sasl=PLAIN").await?;
+    s.send("CAP REQ :sasl").await?;
+    s.expect(":testserver CAP tester ACK :sasl").await?;
+    s.send("AUTHENTICATE SHA256").await?;
+    s.expect(":testserver 904 tester :Unsupported mechanism").await?;
+    s.send("AUTHENTICATE PLAIN").await?;
+    s.expect(":testserver AUTHENTICATE +").await?;
+    s.send("AUTHENTICATE dGVzdGVyAHRlc3RlcgBwYXNzd29yZDE=").await?;
+    s.expect(":testserver 904 tester :Bad credentials").await?;
+    s.send("AUTHENTICATE dGVzdGVyAHRlc3RlcgBwYXNzd29yZA==").await?; // base64-encoded 'tester\x00tester\x00password'
+    s.expect(":testserver 900 tester tester tester :You are now logged in as tester").await?;
+    s.expect(":testserver 903 tester :SASL authentication successful").await?;
+
+    s.send("CAP END").await?;
+
+    s.expect(":testserver 001 tester :Welcome to Kek Server").await?;
+    s.expect(":testserver 002 tester :Welcome to Kek Server").await?;
+    s.expect(":testserver 003 tester :Welcome to Kek Server").await?;
+    s.expect(":testserver 004 tester testserver kek-0.1.alpha.3 r CFILPQbcefgijklmnopqrstvz").await?;
+    s.expect(":testserver 005 tester CHANTYPES=# :are supported by this server").await?;
+    s.expect_nothing().await?;
+    s.send("QUIT :Leaving").await?;
+    s.expect(":testserver ERROR :Leaving the server").await?;
+    s.expect_eof().await?;
+
+    stream.shutdown().await?;
+
+    // wrap up
+
+    server.server.terminate().await?;
+    Ok(())
+}

crates/proto-irc/src/lib.rs

@@ -30,6 +30,10 @@ fn token(input: &str) -> IResult<&str, &str> {
     take_while(|i| i != '\n' && i != '\r')(input)
 }
 
+fn params(input: &str) -> IResult<&str, &str> {
+    take_while(|i| i != '\n' && i != '\r' && i != ':')(input)
+}
+
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum Chan {
     /// #<name> — network-global channel, available from any server in the network.

crates/proto-irc/src/server.rs

@@ -1,3 +1,5 @@
+use std::sync::Arc;
+
 use nonempty::NonEmpty;
 use tokio::io::AsyncWrite;
 use tokio::io::AsyncWriteExt;
@@ -152,6 +154,10 @@ pub enum ServerMessageBody {
     N903SaslSuccess {
         nick: Str,
         message: Str,
+    },
+    N904SaslFail {
+        nick: Str,
+        text: Str,
     }
 }
 
@@ -369,6 +375,13 @@ impl ServerMessageBody {
                 writer.write_all(b" :").await?;
                 writer.write_all(message.as_bytes()).await?;
             }
+            ServerMessageBody::N904SaslFail { nick, text } => {
+                writer.write_all(b"904").await?;
+                writer.write_all(b" ").await?;
+                writer.write_all(nick.as_bytes()).await?;
+                writer.write_all(b" :").await?;
+                writer.write_all(text.as_bytes()).await?;
+            }
         }
         Ok(())
     }
@@ -391,7 +404,7 @@ fn server_message_body(input: &str) -> IResult<&str, ServerMessageBody> {
         server_message_body_notice,
         server_message_body_ping,
         server_message_body_pong,
-        server_message_body_cap,
+        server_message_body_cap
     ))(input)
 }