301 lines
10 KiB
Go
301 lines
10 KiB
Go
package goricochet
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import (
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"crypto"
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"crypto/rsa"
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"encoding/asn1"
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"github.com/s-rah/go-ricochet/utils"
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"net"
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)
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// OpenConnection encapsulates the state required to maintain a connection to
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// a ricochet service.
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// Notably OpenConnection does not enforce limits on the channelIDs, channel Assignments
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// or the direction of messages. These are considered to be service enforced rules.
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// (and services are considered to be the best to define them).
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type OpenConnection struct {
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conn net.Conn
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authHandler map[int32]*AuthenticationHandler
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channels map[int32]string
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rni utils.RicochetNetworkInterface
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Client bool
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IsAuthed bool
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MyHostname string
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OtherHostname string
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Closed bool
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}
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// Init initializes a OpenConnection object to a default state.
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func (oc *OpenConnection) Init(outbound bool, conn net.Conn) {
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oc.conn = conn
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oc.authHandler = make(map[int32]*AuthenticationHandler)
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oc.channels = make(map[int32]string)
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oc.rni = new(utils.RicochetNetwork)
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oc.Client = outbound
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oc.IsAuthed = false
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oc.MyHostname = ""
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oc.OtherHostname = ""
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}
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// UnsetChannel removes a type association from the channel.
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func (oc *OpenConnection) UnsetChannel(channel int32) {
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oc.channels[channel] = "none"
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}
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// GetChannelType returns the type of the channel on this connection
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func (oc *OpenConnection) GetChannelType(channel int32) string {
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if val, ok := oc.channels[channel]; ok {
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return val
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}
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return "none"
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}
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func (oc *OpenConnection) setChannel(channel int32, channelType string) {
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oc.channels[channel] = channelType
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}
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// HasChannel returns true if the connection has a channel of an associated type, false otherwise
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func (oc *OpenConnection) HasChannel(channelType string) bool {
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for _, val := range oc.channels {
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if val == channelType {
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return true
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}
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}
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return false
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}
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// CloseChannel closes a given channel
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// Prerequisites:
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// * Must have previously connected to a service
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func (oc *OpenConnection) CloseChannel(channel int32) {
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oc.UnsetChannel(channel)
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oc.rni.SendRicochetPacket(oc.conn, channel, []byte{})
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}
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// Close closes the entire connection
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func (oc *OpenConnection) Close() {
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oc.conn.Close()
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oc.Closed = true
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}
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// Authenticate opens an Authentication Channel and send a client cookie
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// Prerequisites:
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// * Must have previously connected to a service
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func (oc *OpenConnection) Authenticate(channel int32) {
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defer utils.RecoverFromError()
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oc.authHandler[channel] = new(AuthenticationHandler)
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.OpenAuthenticationChannel(channel, oc.authHandler[channel].GenClientCookie())
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.auth.hidden-service")
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// ConfirmAuthChannel responds to a new authentication request.
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// Prerequisites:
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// * Must have previously connected to a service
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func (oc *OpenConnection) ConfirmAuthChannel(channel int32, clientCookie [16]byte) {
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defer utils.RecoverFromError()
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oc.authHandler[channel] = new(AuthenticationHandler)
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oc.authHandler[channel].AddClientCookie(clientCookie[:])
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.ConfirmAuthChannel(channel, oc.authHandler[channel].GenServerCookie())
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.auth.hidden-service")
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// SendProof sends an authentication proof in response to a challenge.
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// Prerequisites:
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// * Must have previously connected to a service
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// * channel must be of type auth
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func (oc *OpenConnection) SendProof(channel int32, serverCookie [16]byte, publicKeyBytes []byte, privateKey *rsa.PrivateKey) {
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if oc.authHandler[channel] == nil {
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return // NoOp
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}
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oc.authHandler[channel].AddServerCookie(serverCookie[:])
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challenge := oc.authHandler[channel].GenChallenge(oc.MyHostname, oc.OtherHostname)
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signature, _ := rsa.SignPKCS1v15(nil, privateKey, crypto.SHA256, challenge)
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.Proof(publicKeyBytes, signature)
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utils.CheckError(err)
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oc.rni.SendRicochetPacket(oc.conn, channel, data)
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}
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// ValidateProof determines if the given public key and signature align with the
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// already established challenge vector for this communication
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// Prerequisites:
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// * Must have previously connected to a service
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// * Client and Server must have already sent their respective cookies (Authenticate and ConfirmAuthChannel)
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func (oc *OpenConnection) ValidateProof(channel int32, publicKeyBytes []byte, signature []byte) bool {
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if oc.authHandler[channel] == nil {
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return false
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}
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provisionalHostname := utils.GetTorHostname(publicKeyBytes)
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publicKey := new(rsa.PublicKey)
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_, err := asn1.Unmarshal(publicKeyBytes, publicKey)
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if err != nil {
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return false
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}
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challenge := oc.authHandler[channel].GenChallenge(provisionalHostname, oc.MyHostname)
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err = rsa.VerifyPKCS1v15(publicKey, crypto.SHA256, challenge[:], signature)
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if err == nil {
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oc.OtherHostname = provisionalHostname
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return true
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}
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return false
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}
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// SendAuthenticationResult responds to an existed authentication Proof
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// Prerequisites:
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// * Must have previously connected to a service
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// * channel must be of type auth
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func (oc *OpenConnection) SendAuthenticationResult(channel int32, accepted bool, isKnownContact bool) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.AuthResult(accepted, isKnownContact)
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utils.CheckError(err)
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oc.rni.SendRicochetPacket(oc.conn, channel, data)
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}
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// OpenChatChannel opens a new chat channel with the given id
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// Prerequisites:
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// * Must have previously connected to a service
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// * If acting as the client, id must be odd, else even
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func (oc *OpenConnection) OpenChatChannel(channel int32) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.OpenChannel(channel, "im.ricochet.chat")
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.chat")
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// OpenChannel opens a new chat channel with the given id
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// Prerequisites:
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// * Must have previously connected to a service
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// * If acting as the client, id must be odd, else even
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func (oc *OpenConnection) OpenChannel(channel int32, channelType string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.OpenChannel(channel, channelType)
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utils.CheckError(err)
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oc.setChannel(channel, channelType)
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// AckOpenChannel acknowledges a previously received open channel message
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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func (oc *OpenConnection) AckOpenChannel(channel int32, channeltype string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.AckOpenChannel(channel)
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utils.CheckError(err)
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oc.setChannel(channel, channeltype)
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// RejectOpenChannel acknowledges a rejects a previously received open channel message
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// Prerequisites:
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// * Must have previously connected
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func (oc *OpenConnection) RejectOpenChannel(channel int32, errortype string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.RejectOpenChannel(channel, errortype)
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utils.CheckError(err)
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// SendContactRequest initiates a contact request to the server.
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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func (oc *OpenConnection) SendContactRequest(channel int32, nick string, message string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.OpenContactRequestChannel(channel, nick, message)
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.contact.request")
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// AckContactRequestOnResponse responds a contact request from a client
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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// * Must have previously received a Contact Request
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func (oc *OpenConnection) AckContactRequestOnResponse(channel int32, status string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.ReplyToContactRequestOnResponse(channel, status)
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.contact.request")
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oc.rni.SendRicochetPacket(oc.conn, 0, data)
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}
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// AckContactRequest responds to contact request from a client
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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// * Must have previously received a Contact Request
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func (oc *OpenConnection) AckContactRequest(channel int32, status string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.ReplyToContactRequest(channel, status)
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utils.CheckError(err)
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oc.setChannel(channel, "im.ricochet.contact.request")
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oc.rni.SendRicochetPacket(oc.conn, channel, data)
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}
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// AckChatMessage acknowledges a previously received chat message.
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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// * Must have established a known contact status with the other service
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// * Must have received a Chat message on an open im.ricochet.chat channel with the messageID
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func (oc *OpenConnection) AckChatMessage(channel int32, messageID int32) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.AckChatMessage(messageID)
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utils.CheckError(err)
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oc.rni.SendRicochetPacket(oc.conn, channel, data)
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}
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// SendMessage sends a Chat Message (message) to a give Channel (channel).
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// Prerequisites:
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// * Must have previously connected and authenticated to a service
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// * Must have established a known contact status with the other service
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// * Must have previously opened channel with OpenChanel of type im.ricochet.chat
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func (oc *OpenConnection) SendMessage(channel int32, message string) {
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defer utils.RecoverFromError()
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messageBuilder := new(MessageBuilder)
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data, err := messageBuilder.ChatMessage(message, 0)
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utils.CheckError(err)
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oc.rni.SendRicochetPacket(oc.conn, channel, data)
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}
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