Refactor authentication to separate protocol and token generation.

src/authentication.rs

@@ -1,4 +1,3 @@
-use apresolve::apresolve;
 use byteorder::{BigEndian, ByteOrder};
 use crypto;
 use crypto::aes;
@@ -7,27 +6,35 @@ use crypto::hmac::Hmac;
 use crypto::mac::Mac;
 use crypto::pbkdf2::pbkdf2;
 use crypto::sha1::Sha1;
-use protobuf::{self, Message, ProtobufEnum};
+use protobuf::ProtobufEnum;
-use rand::thread_rng;
+use std::io::{self, Read};
-use rand::Rng;
-use std::io::{self, Read, Write};
-use std::result::Result;
 use rustc_serialize::base64::FromBase64;
 
-use connection::{PlainConnection, CipherConnection};
-use diffie_hellman::DHLocalKeys;
-use protocol;
 use protocol::authentication::AuthenticationType;
-use session::Session;
-use util;
 
-fn read_u8<R: Read>(stream: &mut R) -> io::Result<u8> {
+pub struct Credentials {
+    pub username: String,
+    pub auth_type: AuthenticationType,
+    pub auth_data: Vec<u8>,
+}
+
+impl Credentials {
+    pub fn with_password(username: String, password: String) -> Credentials {
+        Credentials {
+            username: username,
+            auth_type: AuthenticationType::AUTHENTICATION_USER_PASS,
+            auth_data: password.into_bytes(),
+        }
+    }
+
+    pub fn with_blob(username: String, encrypted_blob: &str, device_id: &str) -> Credentials {
+        fn read_u8<R: Read>(stream: &mut R) -> io::Result<u8> {
             let mut data = [0u8];
             try!(stream.read_exact(&mut data));
             Ok(data[0])
-}
+        }
 
-fn read_int<R: Read>(stream: &mut R) -> io::Result<u32> {
+        fn read_int<R: Read>(stream: &mut R) -> io::Result<u32> {
             let lo = try!(read_u8(stream)) as u32;
             if lo & 0x80 == 0 {
                 return Ok(lo);
@@ -35,178 +42,22 @@ fn read_int<R: Read>(stream: &mut R) -> io::Result<u32> {
 
             let hi = try!(read_u8(stream)) as u32;
             Ok(lo & 0x7f | hi << 7)
-}
+        }
 
-fn read_bytes<R: Read>(stream: &mut R) -> io::Result<Vec<u8>> {
+        fn read_bytes<R: Read>(stream: &mut R) -> io::Result<Vec<u8>> {
             let length = try!(read_int(stream));
             let mut data = vec![0u8; length as usize];
             try!(stream.read_exact(&mut data));
 
             Ok(data)
-}
-
-impl Session {
-    pub fn connect(&self) -> CipherConnection {
-        let local_keys = DHLocalKeys::random(&mut thread_rng());
-
-        let aps = apresolve().unwrap();
-        let ap = thread_rng().choose(&aps).expect("No APs found");
-
-        println!("Connecting to AP {}", ap);
-        let mut connection = PlainConnection::connect(ap).unwrap();
-
-        let request = protobuf_init!(protocol::keyexchange::ClientHello::new(), {
-            build_info => {
-                product: protocol::keyexchange::Product::PRODUCT_LIBSPOTIFY_EMBEDDED,
-                platform: protocol::keyexchange::Platform::PLATFORM_LINUX_X86,
-                version: 0x10800000000,
-            },
-            /*
-            fingerprints_supported => [
-                protocol::keyexchange::Fingerprint::FINGERPRINT_GRAIN
-            ],
-            */
-            cryptosuites_supported => [
-                protocol::keyexchange::Cryptosuite::CRYPTO_SUITE_SHANNON,
-                //protocol::keyexchange::Cryptosuite::CRYPTO_SUITE_RC4_SHA1_HMAC
-            ],
-            /*
-            powschemes_supported => [
-                protocol::keyexchange::Powscheme::POW_HASH_CASH
-            ],
-            */
-            login_crypto_hello.diffie_hellman => {
-                gc: local_keys.public_key(),
-                server_keys_known: 1,
-            },
-            client_nonce: util::rand_vec(&mut thread_rng(), 0x10),
-            padding: vec![0x1e],
-            feature_set => {
-                autoupdate2: true,
-            }
-        });
-
-        let init_client_packet = connection.send_packet_prefix(&[0, 4],
-                                                               &request.write_to_bytes().unwrap())
-                                           .unwrap();
-        let init_server_packet = connection.recv_packet().unwrap();
-
-        let response: protocol::keyexchange::APResponseMessage =
-            protobuf::parse_from_bytes(&init_server_packet[4..]).unwrap();
-
-        let remote_key = response.get_challenge()
-                                 .get_login_crypto_challenge()
-                                 .get_diffie_hellman()
-                                 .get_gs();
-
-        let shared_secret = local_keys.shared_secret(remote_key);
-        let (challenge, send_key, recv_key) = {
-            let mut data = Vec::with_capacity(0x64);
-            let mut mac = Hmac::new(Sha1::new(), &shared_secret);
-
-            for i in 1..6 {
-                mac.input(&init_client_packet);
-                mac.input(&init_server_packet);
-                mac.input(&[i]);
-                data.write(&mac.result().code()).unwrap();
-                mac.reset();
         }
 
-            mac = Hmac::new(Sha1::new(), &data[..0x14]);
+        let encrypted_blob = encrypted_blob.from_base64().unwrap();
-            mac.input(&init_client_packet);
-            mac.input(&init_server_packet);
-
-            (mac.result().code().to_vec(),
-             data[0x14..0x34].to_vec(),
-             data[0x34..0x54].to_vec())
-        };
-
-        let packet = protobuf_init!(protocol::keyexchange::ClientResponsePlaintext::new(), {
-            login_crypto_response.diffie_hellman => {
-                hmac: challenge
-            },
-            pow_response => {},
-            crypto_response => {},
-        });
-
-
-        connection.send_packet(&packet.write_to_bytes().unwrap()).unwrap();
-
-        CipherConnection::new(connection.into_stream(),
-                              &send_key,
-                              &recv_key)
-    }
-
-    fn login(&self,
-             username: String,
-             auth_data: Vec<u8>,
-             typ: AuthenticationType)
-             -> Result<(), ()> {
-
-        let packet = protobuf_init!(protocol::authentication::ClientResponseEncrypted::new(), {
-            login_credentials => {
-                username: username,
-                typ: typ,
-                auth_data: auth_data,
-            },
-            system_info => {
-                cpu_family: protocol::authentication::CpuFamily::CPU_UNKNOWN,
-                os: protocol::authentication::Os::OS_UNKNOWN,
-                system_information_string: "librespot".to_owned(),
-                device_id: self.device_id().clone()
-            },
-            version_string: util::version::version_string(),
-            appkey => {
-                version: self.config().application_key[0] as u32,
-                devkey: self.config().application_key[0x1..0x81].to_vec(),
-                signature: self.config().application_key[0x81..0x141].to_vec(),
-                useragent: self.config().user_agent.clone(),
-                callback_hash: vec![0; 20],
-            }
-        });
-
-        let mut connection = self.connect();
-        connection.send_packet(0xab, &packet.write_to_bytes().unwrap()).unwrap();
-        let (cmd, data) = connection.recv_packet().unwrap();
-
-        match cmd {
-            0xac => {
-                let welcome_data: protocol::authentication::APWelcome =
-                    protobuf::parse_from_bytes(&data).unwrap();
-
-                let username = welcome_data.get_canonical_username().to_owned();
-                self.authenticated(username, connection);
-
-                eprintln!("Authenticated !");
-                Ok(())
-            }
-
-            0xad => {
-                let msg: protocol::keyexchange::APLoginFailed = protobuf::parse_from_bytes(&data)
-                                                                    .unwrap();
-                eprintln!("Authentication failed, {:?}", msg);
-                Err(())
-            }
-            _ => {
-                println!("Unexpected message {:x}", cmd);
-                Err(())
-            }
-        }
-    }
-
-    pub fn login_password(&self, username: String, password: String) -> Result<(), ()> {
-        self.login(username,
-                   password.into_bytes(),
-                   AuthenticationType::AUTHENTICATION_USER_PASS)
-    }
-
-    pub fn login_blob(&self, username: String, blob: &str) -> Result<(), ()> {
-        let blob = blob.from_base64().unwrap();
 
         let secret = {
             let mut data = [0u8; 20];
             let mut h = crypto::sha1::Sha1::new();
-            h.input(&self.device_id().as_bytes());
+            h.input(device_id.as_bytes());
             h.result(&mut data);
             data
         };
@@ -225,16 +76,16 @@ impl Session {
 
         let blob = {
             // Anyone know what this block mode is ?
-            let mut data = vec![0u8; blob.len()];
+            let mut data = vec![0u8; encrypted_blob.len()];
             let mut cipher = aes::ecb_decryptor(aes::KeySize::KeySize192,
                                                 &key,
                                                 crypto::blockmodes::NoPadding);
-            cipher.decrypt(&mut crypto::buffer::RefReadBuffer::new(&blob),
+            cipher.decrypt(&mut crypto::buffer::RefReadBuffer::new(&encrypted_blob),
                            &mut crypto::buffer::RefWriteBuffer::new(&mut data),
                            true)
                   .unwrap();
 
-            let l = blob.len();
+            let l = encrypted_blob.len();
             for i in 0..l - 0x10 {
                 data[l - i - 1] ^= data[l - i - 0x11];
             }
@@ -251,6 +102,10 @@ impl Session {
         read_u8(&mut cursor).unwrap();
         let auth_data = read_bytes(&mut cursor).unwrap();;
 
-        self.login(username, auth_data, auth_type)
+        Credentials {
+            username: username,
+            auth_type: auth_type,
+            auth_data: auth_data,
+        }
     }
 }

src/discovery.rs

@@ -5,9 +5,10 @@ use num::BigUint;
 use url;
 use rand;
 use rustc_serialize::base64::{self, ToBase64, FromBase64};
-use tiny_http::{Method, Response, ResponseBox, Server};
+use tiny_http::{Method, Request, Response, ResponseBox, Server};
 use zeroconf::DNSService;
 
+use authentication::Credentials;
 use session::Session;
 use diffie_hellman::{DH_GENERATOR, DH_PRIME};
 use util;
@@ -54,7 +55,7 @@ impl DiscoveryManager {
         }).to_string()).boxed()
     }
 
-    fn add_user(&self, params: &[(String, String)]) -> ResponseBox {
+    fn add_user(&self, params: &[(String, String)]) -> (ResponseBox, Credentials) {
         let &(_, ref username) = params.iter().find(|&&(ref key, _)| key == "userName").unwrap();
         let &(_, ref encrypted_blob) = params.iter().find(|&&(ref key, _)| key == "blob").unwrap();
         let &(_, ref client_key) = params.iter().find(|&&(ref key, _)| key == "clientKey").unwrap();
@@ -107,26 +108,18 @@ impl DiscoveryManager {
             String::from_utf8(data).unwrap()
         };
 
-        self.session.login_blob(username.to_owned(), &decrypted).unwrap();
+        let response = Response::from_string(json!({
-
-        Response::from_string(json!({
             "status": 101,
             "spotifyError": 0,
             "statusString": "ERROR-OK"
-        }).to_string()).boxed()
+        }).to_string()).boxed();
+
+        let credentials = Credentials::with_blob(username.to_owned(), &decrypted, &self.session.device_id());
+
+        (response, credentials)
     }
 
-    pub fn run(&mut self) {
+    fn handle_request(&self, mut request: Request) -> Option<Credentials> {
-        let server = Server::http("0.0.0.0:8000").unwrap();
-        let svc = DNSService::register(Some(&self.session.config().device_name),
-                                       "_spotify-connect._tcp",
-                                       None,
-                                       None,
-                                       8000,
-                                       &["VERSION=1.0", "CPath=/"]
-                                       ).unwrap();
-
-        for mut request in server.incoming_requests() {
         let (_, query, _) = url::parse_path(request.url()).unwrap();
         let mut params = query.map_or(vec![], |q| url::form_urlencoded::parse(q.as_bytes()));
 
@@ -140,16 +133,35 @@ impl DiscoveryManager {
         println!("{:?}", params);
 
         let &(_, ref action) = params.iter().find(|&&(ref key, _)| key == "action").unwrap();
-            match action.as_ref() {
+        let (response, credentials) = match action.as_ref() {
-                "getInfo" => request.respond(self.get_info()).unwrap(),
+            "getInfo" => (self.get_info(), None),
             "addUser" => {
-                    request.respond(self.add_user(&params)).unwrap();
+                let (response, credentials) = self.add_user(&params);
-                    break;
+                (response, Some(credentials))
             }
-                _ => request.respond(not_found()).unwrap(),
+            _ => (not_found(), None)
         };
+
+        request.respond(response).unwrap();
+        credentials
     }
 
-        drop(svc);
+    pub fn run(&mut self) -> Credentials {
+        let server = Server::http("0.0.0.0:8000").unwrap();
+        let _svc = DNSService::register(Some(&self.session.config().device_name),
+                                        "_spotify-connect._tcp",
+                                        None,
+                                        None,
+                                        8000,
+                                        &["VERSION=1.0", "CPath=/"]
+                                        ).unwrap();
+
+        for request in server.incoming_requests() {
+            if let Some(credentials) = self.handle_request(request) {
+                return credentials;
+            }
+        }
+
+        panic!("No credentials obtained !");
     }
 }

src/lib.in.rs

@@ -2,7 +2,7 @@
 mod audio_decrypt;
 mod audio_file;
 mod audio_key;
-mod authentication;
+pub mod authentication;
 mod connection;
 mod diffie_hellman;
 pub mod discovery;

src/main.rs

@@ -10,6 +10,7 @@ use std::io::{stdout, Read, Write};
 use std::path::{Path, PathBuf};
 use std::thread;
 
+use librespot::authentication::Credentials;
 use librespot::discovery::DiscoveryManager;
 use librespot::player::Player;
 use librespot::session::{Bitrate, Config, Session};
@@ -89,12 +90,14 @@ fn main() {
 
     let session = Session::new(config);
 
-    if let Some((username, password)) = credentials {
+    let credentials = credentials.map_or_else(|| {
-        session.login_password(username, password).unwrap();
-    } else {
         let mut discovery = DiscoveryManager::new(session.clone());
-        discovery.run();
+        discovery.run()
-    }
+    }, |(username, password)| {
+        Credentials::with_password(username, password)
+    });
+
+    session.login(credentials).unwrap();
 
     let player = Player::new(session.clone());
     let mut spirc = SpircManager::new(session.clone(), player);

src/session.rs

@@ -1,18 +1,28 @@
 use crypto::digest::Digest;
 use crypto::sha1::Sha1;
+use crypto::hmac::Hmac;
+use crypto::mac::Mac;
 use eventual::Future;
-use std::io::Write;
+use protobuf::{self, Message};
+use rand::thread_rng;
+use rand::Rng;
+use std::io::{Read, Write};
 use std::path::PathBuf;
+use std::result::Result;
 use std::sync::{Mutex, RwLock, Arc, mpsc};
 
+use apresolve::apresolve;
 use audio_key::{AudioKeyManager, AudioKey, AudioKeyError};
 use audio_file::{AudioFileManager, AudioFile};
-use connection::{self, CipherConnection};
+use authentication::Credentials;
-use connection::PacketHandler;
+use connection::{self, PlainConnection, CipherConnection, PacketHandler};
+use diffie_hellman::DHLocalKeys;
 use mercury::{MercuryManager, MercuryRequest, MercuryResponse};
 use metadata::{MetadataManager, MetadataRef, MetadataTrait};
+use protocol;
 use stream::{StreamManager, StreamEvent};
-use util::{SpotifyId, FileId, mkdir_existing};
+use util::{self, SpotifyId, FileId, mkdir_existing};
+
 
 pub enum Bitrate {
     Bitrate96,
@@ -79,10 +89,149 @@ impl Session {
         }))
     }
 
-    pub fn authenticated(&self, username: String, connection: CipherConnection) {
+    fn connect(&self) -> CipherConnection {
+        let local_keys = DHLocalKeys::random(&mut thread_rng());
+
+        let aps = apresolve().unwrap();
+        let ap = thread_rng().choose(&aps).expect("No APs found");
+
+        println!("Connecting to AP {}", ap);
+        let mut connection = PlainConnection::connect(ap).unwrap();
+
+        let request = protobuf_init!(protocol::keyexchange::ClientHello::new(), {
+            build_info => {
+                product: protocol::keyexchange::Product::PRODUCT_LIBSPOTIFY_EMBEDDED,
+                platform: protocol::keyexchange::Platform::PLATFORM_LINUX_X86,
+                version: 0x10800000000,
+            },
+            /*
+            fingerprints_supported => [
+                protocol::keyexchange::Fingerprint::FINGERPRINT_GRAIN
+            ],
+            */
+            cryptosuites_supported => [
+                protocol::keyexchange::Cryptosuite::CRYPTO_SUITE_SHANNON,
+                //protocol::keyexchange::Cryptosuite::CRYPTO_SUITE_RC4_SHA1_HMAC
+            ],
+            /*
+            powschemes_supported => [
+                protocol::keyexchange::Powscheme::POW_HASH_CASH
+            ],
+            */
+            login_crypto_hello.diffie_hellman => {
+                gc: local_keys.public_key(),
+                server_keys_known: 1,
+            },
+            client_nonce: util::rand_vec(&mut thread_rng(), 0x10),
+            padding: vec![0x1e],
+            feature_set => {
+                autoupdate2: true,
+            }
+        });
+
+        let init_client_packet = connection.send_packet_prefix(&[0, 4],
+                                                               &request.write_to_bytes().unwrap())
+                                           .unwrap();
+        let init_server_packet = connection.recv_packet().unwrap();
+
+        let response: protocol::keyexchange::APResponseMessage =
+            protobuf::parse_from_bytes(&init_server_packet[4..]).unwrap();
+
+        let remote_key = response.get_challenge()
+                                 .get_login_crypto_challenge()
+                                 .get_diffie_hellman()
+                                 .get_gs();
+
+        let shared_secret = local_keys.shared_secret(remote_key);
+        let (challenge, send_key, recv_key) = {
+            let mut data = Vec::with_capacity(0x64);
+            let mut mac = Hmac::new(Sha1::new(), &shared_secret);
+
+            for i in 1..6 {
+                mac.input(&init_client_packet);
+                mac.input(&init_server_packet);
+                mac.input(&[i]);
+                data.write(&mac.result().code()).unwrap();
+                mac.reset();
+            }
+
+            mac = Hmac::new(Sha1::new(), &data[..0x14]);
+            mac.input(&init_client_packet);
+            mac.input(&init_server_packet);
+
+            (mac.result().code().to_vec(),
+             data[0x14..0x34].to_vec(),
+             data[0x34..0x54].to_vec())
+        };
+
+        let packet = protobuf_init!(protocol::keyexchange::ClientResponsePlaintext::new(), {
+            login_crypto_response.diffie_hellman => {
+                hmac: challenge
+            },
+            pow_response => {},
+            crypto_response => {},
+        });
+
+
+        connection.send_packet(&packet.write_to_bytes().unwrap()).unwrap();
+
+        CipherConnection::new(connection.into_stream(),
+                              &send_key,
+                              &recv_key)
+    }
+
+    pub fn login(&self, credentials: Credentials) -> Result<(), ()> {
+        let packet = protobuf_init!(protocol::authentication::ClientResponseEncrypted::new(), {
+            login_credentials => {
+                username: credentials.username,
+                typ: credentials.auth_type,
+                auth_data: credentials.auth_data,
+            },
+            system_info => {
+                cpu_family: protocol::authentication::CpuFamily::CPU_UNKNOWN,
+                os: protocol::authentication::Os::OS_UNKNOWN,
+                system_information_string: "librespot".to_owned(),
+                device_id: self.device_id(),
+            },
+            version_string: util::version::version_string(),
+            appkey => {
+                version: self.config().application_key[0] as u32,
+                devkey: self.config().application_key[0x1..0x81].to_vec(),
+                signature: self.config().application_key[0x81..0x141].to_vec(),
+                useragent: self.config().user_agent.clone(),
+                callback_hash: vec![0; 20],
+            }
+        });
+
+        let mut connection = self.connect();
+        connection.send_packet(0xab, &packet.write_to_bytes().unwrap()).unwrap();
+        let (cmd, data) = connection.recv_packet().unwrap();
+
+        match cmd {
+            0xac => {
+                let welcome_data: protocol::authentication::APWelcome =
+                    protobuf::parse_from_bytes(&data).unwrap();
+
+                let username = welcome_data.get_canonical_username().to_owned();
                 self.0.data.write().unwrap().canonical_username = username;
                 *self.0.rx_connection.lock().unwrap() = Some(connection.clone());
                 *self.0.tx_connection.lock().unwrap() = Some(connection);
+
+                eprintln!("Authenticated !");
+                Ok(())
+            }
+
+            0xad => {
+                let msg: protocol::keyexchange::APLoginFailed =
+                    protobuf::parse_from_bytes(&data).unwrap();
+                eprintln!("Authentication failed, {:?}", msg);
+                Err(())
+            }
+            _ => {
+                println!("Unexpected message {:x}", cmd);
+                Err(())
+            }
+        }
     }
 
     pub fn poll(&self) {