cwtch/peer/cwtch_peer.go

833 lines
28 KiB
Go

package peer
import (
"cwtch.im/cwtch/event"
"cwtch.im/cwtch/model"
"cwtch.im/cwtch/model/attr"
"cwtch.im/cwtch/protocol/connections"
"encoding/base32"
"encoding/base64"
"encoding/json"
"errors"
"git.openprivacy.ca/openprivacy/log"
"strconv"
"strings"
"sync"
"time"
)
const lastKnownSignature = "LastKnowSignature"
var autoHandleableEvents = map[event.Type]bool{event.EncryptedGroupMessage: true, event.PeerStateChange: true,
event.ServerStateChange: true, event.NewGroupInvite: true, event.NewMessageFromPeer: true,
event.PeerAcknowledgement: true, event.PeerError: true, event.SendMessageToPeerError: true, event.SendMessageToGroupError: true,
event.NewGetValMessageFromPeer: true, event.NewRetValMessageFromPeer: true, event.ProtocolEngineStopped: true, event.RetryServerRequest: true}
// DefaultEventsToHandle specifies which events will be subscribed to
// when a peer has its Init() function called
var DefaultEventsToHandle = []event.Type{
event.EncryptedGroupMessage,
event.NewMessageFromPeer,
event.PeerAcknowledgement,
event.NewGroupInvite,
event.PeerError,
event.SendMessageToGroupError,
event.NewGetValMessageFromPeer,
event.ProtocolEngineStopped,
event.RetryServerRequest,
}
// cwtchPeer manages incoming and outgoing connections and all processing for a Cwtch cwtchPeer
type cwtchPeer struct {
Profile *model.Profile
mutex sync.Mutex
shutdown bool
listenStatus bool
queue event.Queue
eventBus event.Manager
}
func (cp *cwtchPeer) UpdateMessageFlags(handle string, mIdx int, flags uint64) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
log.Debugf("Updating Flags for %v %v %v", handle, mIdx, flags)
cp.Profile.UpdateMessageFlags(handle, mIdx, flags)
cp.eventBus.Publish(event.NewEvent(event.UpdateMessageFlags, map[event.Field]string{event.Handle: handle, event.Index: strconv.Itoa(mIdx), event.Flags: strconv.FormatUint(flags, 2)}))
}
// BlockUnknownConnections will auto disconnect from connections if authentication doesn't resolve a hostname
// known to peer.
func (cp *cwtchPeer) BlockUnknownConnections() {
cp.eventBus.Publish(event.NewEvent(event.BlockUnknownPeers, map[event.Field]string{}))
}
// AllowUnknownConnections will permit connections from unknown contacts.
func (cp *cwtchPeer) AllowUnknownConnections() {
cp.eventBus.Publish(event.NewEvent(event.AllowUnknownPeers, map[event.Field]string{}))
}
// ReadContacts is a meta-interface intended to restrict callers to read-only access to contacts
type ReadContacts interface {
GetContacts() []string
GetContact(string) *model.PublicProfile
GetContactAttribute(string, string) (string, bool)
}
// ModifyContacts is a meta-interface intended to restrict callers to modify-only access to contacts
type ModifyContacts interface {
AddContact(nick, onion string, authorization model.Authorization)
SetContactAuthorization(string, model.Authorization) error
SetContactAttribute(string, string, string)
DeleteContact(string)
}
// AccessPeeringState provides access to functions relating to the underlying connections of a peer.
type AccessPeeringState interface {
GetPeerState(string) (connections.ConnectionState, bool)
}
// ModifyPeeringState is a meta-interface intended to restrict callers to modify-only access to connection peers
type ModifyPeeringState interface {
BlockUnknownConnections()
AllowUnknownConnections()
PeerWithOnion(string)
JoinServer(string) error
}
// ModifyContactsAndPeers is a meta-interface intended to restrict a call to reading and modifying contacts
// and peers.
type ModifyContactsAndPeers interface {
ReadContacts
ModifyContacts
ModifyPeeringState
}
// ReadServers provides access to the servers
type ReadServers interface {
GetServers() []string
}
// ReadGroups provides read-only access to group state
type ReadGroups interface {
GetGroup(string) *model.Group
GetGroupState(string) (connections.ConnectionState, bool)
GetGroups() []string
GetGroupAttribute(string, string) (string, bool)
ExportGroup(string) (string, error)
}
// ModifyGroups provides write-only access add/edit/remove new groups
type ModifyGroups interface {
ImportGroup(string) (string, error)
StartGroup(string) (string, string, error)
AcceptInvite(string) error
RejectInvite(string)
DeleteGroup(string)
SetGroupAttribute(string, string, string)
}
// ModifyServers provides write-only access to servers
type ModifyServers interface {
AddServer(string) error
ResyncServer(onion string) error
}
// SendMessages enables a caller to sender messages to a contact
// Note:
type SendMessages interface {
SendGetValToPeer(string, string, string)
SendMessageToPeer(string, string) string
// TODO This should probably not be exposed
StoreMessage(onion string, messageTxt string, sent time.Time)
// TODO Extract once groups are stable
InviteOnionToGroup(string, string) error
}
// SendMessagesToGroup enables a caller to sender messages to a group
type SendMessagesToGroup interface {
SendMessageToGroupTracked(string, string) (string, error)
}
// ModifyMessages enables a caller to modify the messages in a timline
type ModifyMessages interface {
UpdateMessageFlags(string, int, uint64)
}
// CwtchPeer provides us with a way of testing systems built on top of cwtch without having to
// directly implement a cwtchPeer.
type CwtchPeer interface {
// Core Cwtch Peer Functions that should not be exposed to
// most functions
Init(event.Manager)
AutoHandleEvents(events []event.Type)
Listen()
StartPeersConnections()
StartServerConnections()
Shutdown()
// Relating to local attributes
GetOnion() string
SetAttribute(string, string)
GetAttribute(string) (string, bool)
ReadContacts
ModifyContacts
AccessPeeringState
ModifyPeeringState
ReadGroups
ModifyGroups
ReadServers
ModifyServers
SendMessages
ModifyMessages
SendMessagesToGroup
}
// NewCwtchPeer creates and returns a new cwtchPeer with the given name.
func NewCwtchPeer(name string) CwtchPeer {
cp := new(cwtchPeer)
cp.Profile = model.GenerateNewProfile(name)
cp.shutdown = false
return cp
}
// FromProfile generates a new peer from a profile.
func FromProfile(profile *model.Profile) CwtchPeer {
cp := new(cwtchPeer)
cp.Profile = profile
cp.shutdown = false
return cp
}
// Init instantiates a cwtchPeer
func (cp *cwtchPeer) Init(eventBus event.Manager) {
cp.InitForEvents(eventBus, DefaultEventsToHandle)
}
func (cp *cwtchPeer) InitForEvents(eventBus event.Manager, toBeHandled []event.Type) {
cp.queue = event.NewQueue()
go cp.eventHandler()
cp.eventBus = eventBus
cp.AutoHandleEvents(toBeHandled)
}
// AutoHandleEvents sets an event (if able) to be handled by this peer
func (cp *cwtchPeer) AutoHandleEvents(events []event.Type) {
for _, ev := range events {
if _, exists := autoHandleableEvents[ev]; exists {
cp.eventBus.Subscribe(ev, cp.queue)
} else {
log.Errorf("Peer asked to autohandle event it cannot: %v\n", ev)
}
}
}
// ImportGroup initializes a group from an imported source rather than a peer invite
func (cp *cwtchPeer) ImportGroup(exportedInvite string) (string, error) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
gid, err := cp.Profile.ProcessInvite(exportedInvite)
if err == nil {
cp.eventBus.Publish(event.NewEvent(event.NewGroup, map[event.Field]string{event.GroupID: gid, event.GroupInvite: exportedInvite}))
}
return gid, err
}
// ExportGroup serializes a group invite so it can be given offline
func (cp *cwtchPeer) ExportGroup(groupID string) (string, error) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
group := cp.Profile.GetGroup(groupID)
if group != nil {
return group.Invite()
}
return "", errors.New("group id could not be found")
}
// StartGroup create a new group linked to the given server and returns the group ID, an invite or an error.
func (cp *cwtchPeer) StartGroup(server string) (string, string, error) {
cp.mutex.Lock()
groupID, invite, err := cp.Profile.StartGroup(server)
cp.mutex.Unlock()
if err == nil {
group := cp.GetGroup(groupID)
jsobj, err := json.Marshal(group)
if err == nil {
cp.eventBus.Publish(event.NewEvent(event.GroupCreated, map[event.Field]string{
event.GroupID: groupID,
event.GroupServer: group.GroupServer,
event.GroupInvite: invite,
// Needed for Storage Engine...
event.Data: string(jsobj),
}))
}
} else {
log.Errorf("error creating group: %v", err)
}
return groupID, invite, err
}
// GetGroups returns an unordered list of all group IDs.
func (cp *cwtchPeer) GetGroups() []string {
cp.mutex.Lock()
defer cp.mutex.Unlock()
return cp.Profile.GetGroups()
}
// GetGroup returns a pointer to a specific group, nil if no group exists.
func (cp *cwtchPeer) GetGroup(groupID string) *model.Group {
cp.mutex.Lock()
defer cp.mutex.Unlock()
return cp.Profile.GetGroup(groupID)
}
func (cp *cwtchPeer) AddContact(nick, onion string, authorization model.Authorization) {
decodedPub, _ := base32.StdEncoding.DecodeString(strings.ToUpper(onion))
pp := &model.PublicProfile{Name: nick, Ed25519PublicKey: decodedPub, Authorization: authorization, Onion: onion, Attributes: map[string]string{"nick": nick}}
cp.Profile.AddContact(onion, pp)
pd, _ := json.Marshal(pp)
cp.eventBus.Publish(event.NewEvent(event.PeerCreated, map[event.Field]string{
event.Data: string(pd),
event.RemotePeer: onion,
}))
cp.eventBus.Publish(event.NewEventList(event.SetPeerAuthorization, event.RemotePeer, onion, event.Authorization, string(authorization)))
// Default to Deleting Peer History
cp.eventBus.Publish(event.NewEventList(event.SetPeerAttribute, event.RemotePeer, onion, event.SaveHistoryKey, event.DeleteHistoryDefault))
}
// AddServer takes in a serialized server specification (a bundle of related keys) and adds a contact for the
// server assuming there are no errors and the contact doesn't already exist.
// TODO in the future this function should also integrate with a trust provider to validate the key bundle.
func (cp *cwtchPeer) AddServer(serverSpecification string) error {
// This confirms that the server did at least sign the bundle
keyBundle, err := model.DeserializeAndVerify([]byte(serverSpecification))
if err != nil {
return err
}
log.Debugf("Got new key bundle %v", keyBundle.Serialize())
// TODO if the key bundle is incomplete then error out. In the future we may allow servers to attest to new
// keys or subsets of keys, but for now they must commit only to a complete set of keys required for Cwtch Groups
// (that way we can be assured that the keybundle we store is a valid one)
if !keyBundle.HasKeyType(model.KeyTypeTokenOnion) || !keyBundle.HasKeyType(model.KeyTypeServerOnion) || !keyBundle.HasKeyType(model.KeyTypePrivacyPass) {
return errors.New("keybundle is incomplete")
}
if keyBundle.HasKeyType(model.KeyTypeServerOnion) {
onionKey, _ := keyBundle.GetKey(model.KeyTypeServerOnion)
onion := string(onionKey)
// Add the contact if we don't already have it
if cp.GetContact(onion) == nil {
decodedPub, _ := base32.StdEncoding.DecodeString(strings.ToUpper(onion))
ab := keyBundle.AttributeBundle()
pp := &model.PublicProfile{Name: onion, Ed25519PublicKey: decodedPub, Authorization: model.AuthUnknown, Onion: onion, Attributes: ab}
// The only part of this function that actually modifies the profile...
cp.mutex.Lock()
cp.Profile.AddContact(onion, pp)
cp.mutex.Unlock()
pd, _ := json.Marshal(pp)
// Sync the Storage Engine
cp.eventBus.Publish(event.NewEvent(event.PeerCreated, map[event.Field]string{
event.Data: string(pd),
event.RemotePeer: onion,
}))
}
// At this point we know the server exists
server := cp.GetContact(onion)
ab := keyBundle.AttributeBundle()
// Check server bundle for consistency if we have different keys stored than in the tofu bundle then we
// abort...
for k, v := range ab {
val, exists := server.GetAttribute(k)
if exists {
if val != v {
// this is inconsistent!
return model.InconsistentKeyBundleError
}
}
// we haven't seen this key associated with the server before
}
// Store the key bundle for the server so we can reconstruct a tofubundle invite
cp.SetContactAttribute(onion, string(model.BundleType), serverSpecification)
// If we have gotten to this point we can assume this is a safe key bundle signed by the
// server with no conflicting keys. So we are going to publish all the keys
for k, v := range ab {
log.Debugf("Server (%v) has %v key %v", onion, k, v)
cp.SetContactAttribute(onion, k, v)
}
return nil
}
return err
}
// GetContacts returns an unordered list of onions
func (cp *cwtchPeer) GetContacts() []string {
cp.mutex.Lock()
defer cp.mutex.Unlock()
return cp.Profile.GetContacts()
}
// GetServers returns an unordered list of servers
func (cp *cwtchPeer) GetServers() []string {
contacts := cp.Profile.GetContacts()
var servers []string
for _, contact := range contacts {
if cp.GetContact(contact).IsServer() {
servers = append(servers, contact)
}
}
return servers
}
// GetContact returns a given contact, nil is no such contact exists
func (cp *cwtchPeer) GetContact(onion string) *model.PublicProfile {
cp.mutex.Lock()
defer cp.mutex.Unlock()
contact, _ := cp.Profile.GetContact(onion)
return contact
}
func (cp *cwtchPeer) GetOnion() string {
cp.mutex.Lock()
defer cp.mutex.Unlock()
return cp.Profile.Onion
}
func (cp *cwtchPeer) GetPeerState(onion string) (connections.ConnectionState, bool) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if peer, ok := cp.Profile.Contacts[onion]; ok {
return connections.ConnectionStateToType()[peer.State], true
}
return connections.DISCONNECTED, false
}
func (cp *cwtchPeer) GetGroupState(groupid string) (connections.ConnectionState, bool) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if group, ok := cp.Profile.Groups[groupid]; ok {
return connections.ConnectionStateToType()[group.State], true
}
return connections.DISCONNECTED, false
}
// PeerWithOnion is the entry point for cwtchPeer relationships
func (cp *cwtchPeer) PeerWithOnion(onion string) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if _, exists := cp.Profile.GetContact(onion); !exists {
cp.AddContact(onion, onion, model.AuthApproved)
}
cp.eventBus.Publish(event.NewEvent(event.PeerRequest, map[event.Field]string{event.RemotePeer: onion}))
}
// DeleteContact deletes a peer from the profile, storage, and handling
func (cp *cwtchPeer) DeleteContact(onion string) {
cp.mutex.Lock()
cp.Profile.DeleteContact(onion)
defer cp.mutex.Unlock()
cp.eventBus.Publish(event.NewEventList(event.DeleteContact, event.RemotePeer, onion))
}
// DeleteGroup deletes a Group from the profile, storage, and handling
func (cp *cwtchPeer) DeleteGroup(groupID string) {
cp.mutex.Lock()
cp.Profile.DeleteGroup(groupID)
defer cp.mutex.Unlock()
cp.eventBus.Publish(event.NewEventList(event.DeleteGroup, event.GroupID, groupID))
}
// InviteOnionToGroup kicks off the invite process
func (cp *cwtchPeer) InviteOnionToGroup(onion string, groupid string) error {
cp.mutex.Lock()
group := cp.Profile.GetGroup(groupid)
if group == nil {
cp.mutex.Unlock()
return errors.New("invalid group id")
}
invite, err := group.Invite()
cp.mutex.Unlock()
if err == nil {
cp.SendMessageToPeer(onion, invite)
}
return err
}
// JoinServer manages a new server connection with the given onion address
func (cp *cwtchPeer) JoinServer(onion string) error {
if cp.GetContact(onion) != nil {
tokenY, yExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypePrivacyPass))
tokenOnion, onionExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypeTokenOnion))
if yExists && onionExists {
signature, exists := cp.GetContactAttribute(onion, lastKnownSignature)
if !exists {
signature = base64.StdEncoding.EncodeToString([]byte{})
}
cp.eventBus.Publish(event.NewEvent(event.JoinServer, map[event.Field]string{event.GroupServer: onion, event.ServerTokenY: tokenY, event.ServerTokenOnion: tokenOnion, event.Signature: signature}))
return nil
}
}
return errors.New("no keys found for server connection")
}
// ResyncServer completely tears down and resyncs a new server connection with the given onion address
func (cp *cwtchPeer) ResyncServer(onion string) error {
if cp.GetContact(onion) != nil {
tokenY, yExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypePrivacyPass))
tokenOnion, onionExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypeTokenOnion))
if yExists && onionExists {
signature := base64.StdEncoding.EncodeToString([]byte{})
cp.eventBus.Publish(event.NewEvent(event.JoinServer, map[event.Field]string{event.GroupServer: onion, event.ServerTokenY: tokenY, event.ServerTokenOnion: tokenOnion, event.Signature: signature}))
return nil
}
}
return errors.New("no keys found for server connection")
}
// SendMessageToGroupTracked attempts to sent the given message to the given group id.
// It returns the signature of the message which can be used to identify it in any UX layer.
func (cp *cwtchPeer) SendMessageToGroupTracked(groupid string, message string) (string, error) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
group := cp.Profile.GetGroup(groupid)
if group == nil {
return "", errors.New("invalid group id")
}
ct, sig, err := cp.Profile.EncryptMessageToGroup(message, groupid)
if err == nil {
cp.eventBus.Publish(event.NewEvent(event.SendMessageToGroup, map[event.Field]string{event.GroupID: groupid, event.GroupServer: group.GroupServer, event.Ciphertext: base64.StdEncoding.EncodeToString(ct), event.Signature: base64.StdEncoding.EncodeToString(sig)}))
}
return base64.StdEncoding.EncodeToString(sig), err
}
func (cp *cwtchPeer) SendMessageToPeer(onion string, message string) string {
event := event.NewEvent(event.SendMessageToPeer, map[event.Field]string{event.RemotePeer: onion, event.Data: message})
cp.mutex.Lock()
contact, _ := cp.Profile.GetContact(onion)
event.EventID = strconv.Itoa(contact.Timeline.Len())
cp.Profile.AddSentMessageToContactTimeline(onion, message, time.Now(), event.EventID)
cp.mutex.Unlock()
cp.eventBus.Publish(event)
return event.EventID
}
func (cp *cwtchPeer) SendGetValToPeer(onion string, scope string, path string) {
event := event.NewEventList(event.SendGetValMessageToPeer, event.RemotePeer, onion, event.Scope, scope, event.Path, path)
cp.eventBus.Publish(event)
}
// BlockPeer blocks an existing peer relationship.
func (cp *cwtchPeer) SetContactAuthorization(peer string, authorization model.Authorization) error {
cp.mutex.Lock()
err := cp.Profile.SetContactAuthorization(peer, authorization)
cp.mutex.Unlock()
cp.eventBus.Publish(event.NewEvent(event.SetPeerAuthorization, map[event.Field]string{event.RemotePeer: peer, event.Authorization: string(authorization)}))
return err
}
// AcceptInvite accepts a given existing group invite
func (cp *cwtchPeer) AcceptInvite(groupID string) error {
cp.mutex.Lock()
err := cp.Profile.AcceptInvite(groupID)
cp.mutex.Unlock()
if err != nil {
return err
}
cp.eventBus.Publish(event.NewEvent(event.AcceptGroupInvite, map[event.Field]string{event.GroupID: groupID}))
cp.JoinServer(cp.Profile.Groups[groupID].GroupServer)
return nil
}
// RejectInvite rejects a given group invite.
func (cp *cwtchPeer) RejectInvite(groupID string) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
cp.Profile.RejectInvite(groupID)
cp.eventBus.Publish(event.NewEvent(event.RejectGroupInvite, map[event.Field]string{event.GroupID: groupID}))
}
// Listen makes the peer open a listening port to accept incoming connections (and be detactably online)
func (cp *cwtchPeer) Listen() {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if !cp.listenStatus {
log.Infof("cwtchPeer Listen sending ProtocolEngineStartListen\n")
cp.listenStatus = true
cp.eventBus.Publish(event.NewEvent(event.ProtocolEngineStartListen, map[event.Field]string{event.Onion: cp.Profile.Onion}))
}
// else protocol engine is already listening
}
// StartPeersConnections attempts to connect to peer connections
func (cp *cwtchPeer) StartPeersConnections() {
for _, contact := range cp.GetContacts() {
if !cp.GetContact(contact).IsServer() {
cp.PeerWithOnion(contact)
}
}
}
// StartServerConnections attempts to connect to all server connections
func (cp *cwtchPeer) StartServerConnections() {
for _, contact := range cp.GetContacts() {
if cp.GetContact(contact).IsServer() {
cp.JoinServer(contact)
}
}
}
// SetAttribute sets an attribute for this profile and emits an event
func (cp *cwtchPeer) SetAttribute(key string, val string) {
cp.mutex.Lock()
cp.Profile.SetAttribute(key, val)
defer cp.mutex.Unlock()
cp.eventBus.Publish(event.NewEvent(event.SetAttribute, map[event.Field]string{
event.Key: key,
event.Data: val,
}))
}
// GetAttribute gets an attribute for the profile
func (cp *cwtchPeer) GetAttribute(key string) (string, bool) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if val, exists := cp.Profile.GetAttribute(key); exists {
return val, true
}
if key == attr.GetLocalScope("name") {
return cp.Profile.Name, true
}
return "", false
}
// SetContactAttribute sets an attribute for the indicated contact and emits an event
func (cp *cwtchPeer) SetContactAttribute(onion string, key string, val string) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if contact, ok := cp.Profile.GetContact(onion); ok {
contact.SetAttribute(key, val)
cp.eventBus.Publish(event.NewEvent(event.SetPeerAttribute, map[event.Field]string{
event.RemotePeer: onion,
event.Key: key,
event.Data: val,
}))
}
}
// GetContactAttribute gets an attribute for the indicated contact
func (cp *cwtchPeer) GetContactAttribute(onion string, key string) (string, bool) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if contact, ok := cp.Profile.GetContact(onion); ok {
if val, exists := contact.GetAttribute(key); exists {
return val, true
}
}
return "", false
}
// SetGroupAttribute sets an attribute for the indicated group and emits an event
func (cp *cwtchPeer) SetGroupAttribute(gid string, key string, val string) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if group := cp.Profile.GetGroup(gid); group != nil {
group.SetAttribute(key, val)
cp.eventBus.Publish(event.NewEvent(event.SetGroupAttribute, map[event.Field]string{
event.GroupID: gid,
event.Key: key,
event.Data: val,
}))
}
}
// GetGroupAttribute gets an attribute for the indicated group
func (cp *cwtchPeer) GetGroupAttribute(gid string, key string) (string, bool) {
cp.mutex.Lock()
defer cp.mutex.Unlock()
if group := cp.Profile.GetGroup(gid); group != nil {
if val, exists := group.GetAttribute(key); exists {
return val, true
}
}
return "", false
}
// Shutdown kills all connections and cleans up all goroutines for the peer
func (cp *cwtchPeer) Shutdown() {
cp.mutex.Lock()
defer cp.mutex.Unlock()
cp.shutdown = true
cp.queue.Shutdown()
}
func (cp *cwtchPeer) StoreMessage(onion string, messageTxt string, sent time.Time) {
if cp.GetContact(onion) == nil {
cp.AddContact(onion, onion, model.AuthUnknown)
}
cp.mutex.Lock()
cp.Profile.AddMessageToContactTimeline(onion, messageTxt, sent)
cp.mutex.Unlock()
}
// eventHandler process events from other subsystems
func (cp *cwtchPeer) eventHandler() {
for {
ev := cp.queue.Next()
switch ev.EventType {
/***** Default auto handled events *****/
case event.ProtocolEngineStopped:
cp.mutex.Lock()
cp.listenStatus = false
log.Infof("Protocol engine for %v has stopped listening", cp.Profile.Onion)
cp.mutex.Unlock()
case event.EncryptedGroupMessage:
// If successful, a side effect is the message is added to the group's timeline
ciphertext, _ := base64.StdEncoding.DecodeString(ev.Data[event.Ciphertext])
signature, _ := base64.StdEncoding.DecodeString(ev.Data[event.Signature])
// SECURITY NOTE: A malicious server could insert posts such that everyone always has a different lastKnownSignature
// However the server can always replace **all** messages in an attempt to track users
// This is mitigated somewhat by resync events which do wipe things entire.
// The security of cwtch groups are also not dependent on the servers inability to uniquely tag connections (as long as
// it learns nothing else about each connection).
cp.SetContactAttribute(ev.Data[event.GroupServer], lastKnownSignature, ev.Data[event.Signature])
cp.mutex.Lock()
ok, groupID, message, seen := cp.Profile.AttemptDecryption(ciphertext, signature)
cp.mutex.Unlock()
if ok && !seen {
cp.eventBus.Publish(event.NewEvent(event.NewMessageFromGroup, map[event.Field]string{event.TimestampReceived: message.Received.Format(time.RFC3339Nano), event.TimestampSent: message.Timestamp.Format(time.RFC3339Nano), event.Data: message.Message, event.GroupID: groupID, event.Signature: base64.StdEncoding.EncodeToString(message.Signature), event.PreviousSignature: base64.StdEncoding.EncodeToString(message.PreviousMessageSig), event.RemotePeer: message.PeerID}))
}
// The group has been compromised
if !ok && groupID != "" {
if cp.Profile.GetGroup(groupID).IsCompromised {
cp.eventBus.Publish(event.NewEvent(event.GroupCompromised, map[event.Field]string{event.GroupID: groupID}))
}
}
case event.NewMessageFromPeer: //event.TimestampReceived, event.RemotePeer, event.Data
ts, _ := time.Parse(time.RFC3339Nano, ev.Data[event.TimestampReceived])
cp.StoreMessage(ev.Data[event.RemotePeer], ev.Data[event.Data], ts)
case event.PeerAcknowledgement:
cp.mutex.Lock()
idx := cp.Profile.AckSentMessageToPeer(ev.Data[event.RemotePeer], ev.Data[event.EventID])
edata := ev.Data
edata[event.Index] = strconv.Itoa(idx)
cp.eventBus.Publish(event.NewEvent(event.IndexedAcknowledgement, edata))
cp.mutex.Unlock()
case event.SendMessageToGroupError:
cp.mutex.Lock()
signature, _ := base64.StdEncoding.DecodeString(ev.Data[event.Signature])
cp.Profile.AddGroupSentMessageError(ev.Data[event.GroupID], signature, ev.Data[event.Error])
cp.mutex.Unlock()
case event.SendMessageToPeerError:
cp.mutex.Lock()
idx := cp.Profile.ErrorSentMessageToPeer(ev.Data[event.RemotePeer], ev.Data[event.EventID], ev.Data[event.Error])
edata := ev.Data
edata[event.Index] = strconv.Itoa(idx)
cp.eventBus.Publish(event.NewEvent(event.IndexedFailure, edata))
cp.mutex.Unlock()
case event.RetryServerRequest:
// Automated Join Server Request triggered by a plugin.
log.Debugf("profile received an automated retry event for %v", ev.Data[event.GroupServer])
cp.JoinServer(ev.Data[event.GroupServer])
case event.NewGetValMessageFromPeer:
onion := ev.Data[event.RemotePeer]
scope := ev.Data[event.Scope]
path := ev.Data[event.Path]
log.Debugf("NewGetValMessageFromPeer for %v%v from %v\n", scope, path, onion)
remotePeer := cp.GetContact(onion)
if remotePeer != nil && remotePeer.Authorization == model.AuthApproved {
if scope == attr.PublicScope {
val, exists := cp.GetAttribute(attr.GetPublicScope(path))
resp := event.NewEvent(event.SendRetValMessageToPeer, map[event.Field]string{event.RemotePeer: onion, event.Exists: strconv.FormatBool(exists)})
resp.EventID = ev.EventID
if exists {
resp.Data[event.Data] = val
} else {
resp.Data[event.Data] = ""
}
log.Debugf("Responding with SendRetValMessageToPeer exists:%v data: %v\n", exists, val)
cp.eventBus.Publish(resp)
}
}
/***** Non default but requestable handlable events *****/
case event.NewRetValMessageFromPeer:
onion := ev.Data[event.RemotePeer]
scope := ev.Data[event.Scope]
path := ev.Data[event.Path]
val := ev.Data[event.Data]
exists, _ := strconv.ParseBool(ev.Data[event.Exists])
log.Debugf("NewRetValMessageFromPeer %v %v%v %v %v\n", onion, scope, path, exists, val)
if exists {
if scope == attr.PublicScope {
cp.SetContactAttribute(onion, attr.GetPeerScope(path), val)
}
}
case event.PeerStateChange:
cp.mutex.Lock()
if _, exists := cp.Profile.Contacts[ev.Data[event.RemotePeer]]; exists {
cp.Profile.Contacts[ev.Data[event.RemotePeer]].State = ev.Data[event.ConnectionState]
}
cp.mutex.Unlock()
case event.ServerStateChange:
cp.mutex.Lock()
// We update both the server contact status, as well as the groups the server belongs to
cp.Profile.Contacts[ev.Data[event.GroupServer]].State = ev.Data[event.ConnectionState]
// TODO deprecate this, the UI should consult the server contact entry instead (it's far more efficient)
for _, group := range cp.Profile.Groups {
if group.GroupServer == ev.Data[event.GroupServer] {
group.State = ev.Data[event.ConnectionState]
}
}
cp.mutex.Unlock()
default:
if ev.EventType != "" {
log.Errorf("peer event handler received an event it was not subscribed for: %v", ev.EventType)
}
return
}
}
}