package core import ( "crypto/rsa" "encoding/base64" "errors" "github.com/ricochet-im/ricochet-go/core/utils" protocol "github.com/s-rah/go-ricochet" connection "github.com/s-rah/go-ricochet/connection" "github.com/yawning/bulb/utils/pkcs1" "log" "net" "sync" ) // Identity represents the local user, including their contact address, // and contains the contacts list. type Identity struct { core *Ricochet mutex sync.Mutex address string privateKey *rsa.PrivateKey contactList *ContactList ConversationStream *utils.Publisher } func CreateIdentity(core *Ricochet) (*Identity, error) { me := &Identity{ core: core, ConversationStream: utils.CreatePublisher(), } if err := me.loadIdentity(); err != nil { log.Printf("Failed loading identity: %v", err) return nil, err } contactList, err := LoadContactList(core) if err != nil { log.Printf("Failed loading contact list: %v", err) return nil, err } me.contactList = contactList contactList.StartConnections() go me.publishService(me.privateKey) return me, nil } func (me *Identity) loadIdentity() error { config := me.core.Config.OpenRead() defer config.Close() if config.Identity.ServiceKey != "" { keyData, err := base64.StdEncoding.DecodeString(config.Identity.ServiceKey) if err != nil { return err } me.privateKey, _, err = pkcs1.DecodePrivateKeyDER(keyData) if err != nil { return err } me.address, err = AddressFromKey(&me.privateKey.PublicKey) if err != nil { return err } log.Printf("Loaded identity %s", me.address) } else { log.Printf("Initializing new identity") } return nil } func (me *Identity) setPrivateKey(key *rsa.PrivateKey) error { me.mutex.Lock() defer me.mutex.Unlock() if me.privateKey != nil || me.address != "" { return errors.New("Cannot change private key on identity") } // Save key to config keyData, err := pkcs1.EncodePrivateKeyDER(key) if err != nil { return err } config := me.core.Config.OpenWrite() config.Identity.ServiceKey = base64.StdEncoding.EncodeToString(keyData) config.Save() // Update Identity me.address, err = AddressFromKey(&key.PublicKey) if err != nil { return err } me.privateKey = key log.Printf("Created new identity %s", me.address) return nil } // BUG(special): No error handling for failures under publishService func (me *Identity) publishService(key *rsa.PrivateKey) { // This call will block until a control connection is available and the // ADD_ONION command has returned. After creating the listener, it will // be automatically re-published if the control connection is lost and // later reconnected. service, listener, err := me.core.Network.NewOnionListener(9878, key) if err != nil { log.Printf("Identity listener failed: %v", err) // XXX handle return } if key == nil { if service.PrivateKey == nil { log.Printf("Setting private key failed: no key returned") // XXX handle return } err := me.setPrivateKey(service.PrivateKey.(*rsa.PrivateKey)) if err != nil { log.Printf("Setting private key failed: %v", err) // XXX handle return } } log.Printf("Identity service published, accepting connections") for { conn, err := listener.Accept() if err != nil { log.Printf("Identity listener failed: %v", err) // XXX handle return } // Handle connection in a separate goroutine and continue listening go me.handleInboundConnection(conn) } } func (me *Identity) handleInboundConnection(conn net.Conn) error { defer func() { // Close conn on return unless explicitly cleared if conn != nil { conn.Close() } }() contactByHostname := func(hostname string) (*Contact, error) { address, ok := AddressFromPlainHost(hostname) if !ok { // This would be a bug return nil, errors.New("invalid authenticated hostname") } return me.contactList.ContactByAddress(address), nil } lookupContactAuth := func(hostname string, publicKey rsa.PublicKey) (bool, bool) { contact, err := contactByHostname(hostname) if err != nil { return false, false } // allowed, known return true, contact != nil } rc, err := protocol.NegotiateVersionInbound(conn) if err != nil { log.Printf("Inbound connection failed: %v", err) return err } authHandler := connection.HandleInboundConnection(rc) err = authHandler.ProcessAuthAsServer(me.privateKey, lookupContactAuth) if err != nil { log.Printf("Inbound connection auth failed: %v", err) return err } contact, err := contactByHostname(rc.RemoteHostname) if err != nil { log.Printf("Inbound connection lookup failed: %v", err) return err } if contact != nil { // Known contact, pass the new connection to Contact contact.AssignConnection(rc) conn = nil return nil } // XXX-protocol Unknown contact, should pass to handler for contact requests log.Printf("Inbound connection is a contact request, but that's not implemented yet") return errors.New("inbound contact request connections aren't implemented") } func (me *Identity) Address() string { return me.address } func (me *Identity) ContactList() *ContactList { return me.contactList } func (me *Identity) PrivateKey() rsa.PrivateKey { return *me.privateKey }