forked from cwtch.im/tapir
Error Handling
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c769bdf208
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@ -1,5 +1,7 @@
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package tapir
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// Application defines the interface for all Tapir Applications
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type Application interface {
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NewInstance() Application
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Init(connection *Connection)
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17
auth_app.go
17
auth_app.go
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@ -12,18 +12,26 @@ import (
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"time"
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)
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type AuthApp struct {
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}
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// AuthMessage is exchanged between peers to obtain the Auth Capability
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type AuthMessage struct {
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LongTermPublicKey ed25519.PublicKey
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EphemeralPublicKey ed25519.PublicKey
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}
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// AuthCapability defines the Authentication Capability granted by AuthApp
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const AuthCapability = "AUTH"
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// AuthApp is the concrete Application type that handles Authentication
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type AuthApp struct {
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}
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// NewInstance creates a new instance of the AuthApp
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func (ea AuthApp) NewInstance() Application {
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return new(AuthApp)
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}
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// Init runs the entire AuthApp protocol, at the end of the protocol either the connection is granted AUTH capability
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// or the connection is closed.
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func (ea AuthApp) Init(connection *Connection) {
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longTermPubKey := ed25519.PublicKey(connection.ID.PublicKeyBytes())
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epk, esk, _ := ed25519.GenerateKey(rand.Reader)
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@ -85,8 +93,9 @@ func (ea AuthApp) Init(connection *Connection) {
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remoteChallenge := connection.Expect()
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if subtle.ConstantTimeCompare(challengeBytes, remoteChallenge) == 1 {
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connection.SetHostname(utils.GetTorV3Hostname(remoteAuthMessage.LongTermPublicKey))
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connection.SetCapability("AUTH")
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connection.SetCapability(AuthCapability)
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} else {
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log.Errorf("Failed Decrypt Challenge: [%x] [%x]\n", remoteChallenge, challengeBytes)
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connection.conn.Close()
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}
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}
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12
cmd/main.go
12
cmd/main.go
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@ -12,7 +12,7 @@ import (
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"time"
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)
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// Simple App is a trivial implementation of a basic p2p application
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// SimpleApp is a trivial implementation of a basic p2p application
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type SimpleApp struct {
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tapir.AuthApp
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}
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@ -27,7 +27,7 @@ func (ea SimpleApp) Init(connection *tapir.Connection) {
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// First run the Authentication App
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ea.AuthApp.Init(connection)
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if connection.HasCapability("AUTH") {
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if connection.HasCapability(tapir.AuthCapability) {
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// The code for out simple application (We just send and receive "Hello"
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connection.Send([]byte("Hello"))
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message := connection.Expect()
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@ -53,7 +53,7 @@ func main() {
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// Start a Client to Connect to the Server
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go client(acn, pubkey)
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// Start the Server running the Echo App.
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// Start the Server running the Simple App.
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var service tapir.Service
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service = new(tapir.BaseOnionService)
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service.Start(acn, sk, id)
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@ -69,10 +69,14 @@ func client(acn connectivity.ACN, key ed25519.PublicKey) {
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var client tapir.Service
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client = new(tapir.BaseOnionService)
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client.Start(acn, sk, id)
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client.Connect(utils.GetTorV3Hostname(key), SimpleApp{})
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cid,_ := client.Connect(utils.GetTorV3Hostname(key), SimpleApp{})
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// Once connected, it shouldn't take long to authenticate and run the application. So for the purposes of this demo
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// we will wait a little while then exit.
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time.Sleep(time.Second * 5)
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conn,_ := client.GetConnection(cid)
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log.Debugf("Client has Auth: %v", conn.HasCapability(tapir.AuthCapability))
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os.Exit(0)
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}
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63
service.go
63
service.go
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@ -15,12 +15,17 @@ import (
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"sync"
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)
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// Service defines the interface for a Tapir Service
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type Service interface {
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Start(acn connectivity.ACN, privateKey ed25519.PrivateKey, identity identity.Identity)
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Connect(hostname string, application Application) error
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Connect(hostname string, application Application) (string, error)
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Listen(application Application) error
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GetConnection(connectionID string) (*Connection, error)
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}
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// Connection defines a Tapir Connection
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type Connection struct {
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hostname string
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conn net.Conn
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@ -32,6 +37,7 @@ type Connection struct {
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Outbound bool
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}
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// NewConnection creates a new Connection
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func NewConnection(id identity.Identity, hostname string, outbound bool, conn net.Conn, app Application) *Connection {
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connection := new(Connection)
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connection.hostname = hostname
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@ -43,25 +49,33 @@ func NewConnection(id identity.Identity, hostname string, outbound bool, conn ne
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return connection
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}
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// SetHostname sets the hostname on the connection
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func (c *Connection) SetHostname(hostname string) {
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log.Debugf("[%v -- %v] Asserting Remote Hostname: %v", c.ID.Hostname(), c.hostname, hostname)
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c.hostname = hostname
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}
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// SetCapability sets a capability on the connection
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func (c *Connection) SetCapability(name string) {
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log.Debugf("[%v -- %v] Setting Capability %v", c.ID.Hostname(), c.hostname, name)
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c.capabilities.Store(name, true)
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}
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// HasCapability checks if the connection has a given capability
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func (c *Connection) HasCapability(name string) bool {
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_, ok := c.capabilities.Load(name)
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return ok
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}
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// Expect blocks and reads a single Tapir packet (1024 bytes), from the connection.
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func (c *Connection) Expect() []byte {
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buffer := make([]byte, 1024)
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// TODO handle ERROR
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io.ReadFull(c.conn, buffer)
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n, err := io.ReadFull(c.conn, buffer)
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if n != 1024 || err != nil {
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log.Errorf("[%v -> %v] Wire Error Reading, Read %d bytes, Error: %v", c.hostname, c.ID.Hostname(), n, err)
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return []byte{}
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}
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//log.Debugf("[%v -> %v] Wire Receive: %x", c.hostname, c.ID.Hostname(), buffer)
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if c.encrypted {
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@ -79,11 +93,14 @@ func (c *Connection) Expect() []byte {
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return buffer[2 : len+2]
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}
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// SetEncryptionKey turns on application-level encryption on the connection using the given key.
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func (c *Connection) SetEncryptionKey(key [32]byte) {
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c.key = key
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c.encrypted = true
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}
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// Send writes a given message to a Tapir packet (of 1024 bytes in length).
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func (c *Connection) Send(message []byte) {
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maxLength := 1024
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@ -104,6 +121,7 @@ func (c *Connection) Send(message []byte) {
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c.conn.Write(buffer)
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}
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// BaseOnionService is a concrete implementation of the service interface over Tor onion services.
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type BaseOnionService struct {
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connections sync.Map
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acn connectivity.ACN
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@ -111,6 +129,9 @@ type BaseOnionService struct {
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privateKey ed25519.PrivateKey
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}
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// Start initializes a BaseOnionService with a given private key and identity
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// The private key is needed to initialize the Onion listen socket, ideally we could just pass an Identity in here.
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func (s *BaseOnionService) Start(acn connectivity.ACN, sk ed25519.PrivateKey, id identity.Identity) {
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// run add onion
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// get listen context
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@ -119,24 +140,42 @@ func (s *BaseOnionService) Start(acn connectivity.ACN, sk ed25519.PrivateKey, id
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s.privateKey = sk
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}
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func (s *BaseOnionService) GetConnection(hostname string) error {
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return errors.New("no connection found")
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// GetConnection returns a connection for a given hostname.
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func (s *BaseOnionService) GetConnection(connectionID string) (*Connection, error) {
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conn,ok := s.connections.Load(connectionID)
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if !ok {
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return nil, errors.New("no connection found")
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}
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connection := conn.(*Connection)
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return connection, nil
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}
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func (s *BaseOnionService) Connect(hostname string, app Application) error {
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// Connect initializes a new outbound connection to the given peer, using the defined Application
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func (s *BaseOnionService) Connect(hostname string, app Application) (string, error) {
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// connects to a remote server
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// spins off to a connection struct
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log.Debugf("Connecting to %v", hostname)
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conn, _, err := s.acn.Open(hostname)
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if err == nil {
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log.Debugf("Connected to %v", hostname)
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s.connections.Store(hostname, NewConnection(s.id, hostname, true, conn, app.NewInstance()))
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return nil
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connectionID := s.getNewConnectionID()
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log.Debugf("Connected to %v [%v]", hostname, connectionID)
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s.connections.Store(connectionID, NewConnection(s.id, hostname, true, conn, app.NewInstance()))
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return connectionID, nil
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}
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log.Debugf("Error connecting to %v %v", hostname, err)
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return err
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return "", err
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}
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func (s *BaseOnionService) getNewConnectionID() string {
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id := make([]byte, 10)
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rand.Read(id)
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connectionID := "connection-" + base64.StdEncoding.EncodeToString(id)
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return connectionID
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}
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// Listen starts a blocking routine that waits for incoming connections and initializes connections with them based
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// on the given Application.
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func (s *BaseOnionService) Listen(app Application) error {
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// accepts a new connection
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// spins off to a connection struct
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for {
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conn, err := ls.Accept()
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if err == nil {
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id := make([]byte, 10)
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rand.Read(id)
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tempHostname := "unknown-" + base64.StdEncoding.EncodeToString(id)
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tempHostname := s.getNewConnectionID()
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log.Debugf("Accepted connection from %v", tempHostname)
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s.connections.Store(tempHostname, NewConnection(s.id, tempHostname, false, conn, app.NewInstance()))
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} else {
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