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Fix concurrency on the client (#183)

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* reworked peer connection establishment logic eliminating race conditions and deadlocks while running many peers
This commit is contained in:
Mikhail Bragin 2022-01-10 18:43:13 +01:00 committed by GitHub
parent 828410b34c
commit 319632ffe8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
25 changed files with 1216 additions and 898 deletions
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44
.github/workflows/golang-test-build.yml vendored Normal file
View File

@ -0,0 +1,44 @@
on:
push:
branches:
- main
pull_request:
name: Test Build On Platforms
jobs:
test_build:
strategy:
matrix:
os: [ windows, linux, darwin ]
go-version: [1.17.x]
runs-on: ubuntu-latest
steps:
- name: Checkout code
uses: actions/checkout@v2
- name: Install Go
uses: actions/setup-go@v2
with:
go-version: ${{ matrix.go-version }}
- name: Cache Go modules
uses: actions/cache@v1
with:
path: ~/go/pkg/mod
key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
restore-keys: |
${{ runner.os }}-go-
- name: Install modules
run: go mod tidy
- name: run build client
run: GOOS=${{ matrix.os }} go build .
working-directory: client
- name: run build management
run: GOOS=${{ matrix.os }} go build .
working-directory: management
- name: run build signal
run: GOOS=${{ matrix.os }} go build .
working-directory: signal

52
.github/workflows/golang-test.yml vendored
View File

@ -3,7 +3,7 @@ on:
branches:
- main
pull_request:
name: Test
name: Test Code
jobs:
test:
strategy:
@ -15,45 +15,19 @@ jobs:
uses: actions/setup-go@v2
with:
go-version: ${{ matrix.go-version }}
- name: update limits.d
run: |
cat <<'EOF' | sudo tee -a /etc/security/limits.d/wt.conf
root soft nproc 65535
root hard nproc 65535
root soft nofile 65535
root hard nofile 65535
$(whoami) soft nproc 65535
$(whoami) hard nproc 65535
$(whoami) soft nofile 65535
$(whoami) hard nofile 65535
EOF
- name: Checkout code
uses: actions/checkout@v2
- name: Test
run: GOBIN=$(which go) && sudo --preserve-env=GOROOT $GOBIN test -p 1 ./...
test_build:
strategy:
matrix:
os: [ windows, linux, darwin ]
go-version: [1.17.x]
runs-on: ubuntu-latest
steps:
- name: Checkout code
uses: actions/checkout@v2
- name: Install Go
uses: actions/setup-go@v2
with:
go-version: ${{ matrix.go-version }}
- name: Cache Go modules
uses: actions/cache@v1
with:
path: ~/go/pkg/mod
key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
restore-keys: |
${{ runner.os }}-go-
- name: Install modules
run: go mod tidy
- name: run build client
run: GOOS=${{ matrix.os }} go build .
working-directory: client
- name: run build management
run: GOOS=${{ matrix.os }} go build .
working-directory: management
- name: run build signal
run: GOOS=${{ matrix.os }} go build .
working-directory: signal

1
client/cmd/up.go
View File

@ -68,6 +68,7 @@ func createEngineConfig(key wgtypes.Key, config *internal.Config, peerConfig *mg
WgAddr: peerConfig.Address,
IFaceBlackList: iFaceBlackList,
WgPrivateKey: key,
WgPort: internal.WgPort,
}
if config.PreSharedKey != "" {

2
client/cmd/up_test.go
View File

@ -36,7 +36,7 @@ func TestUp_Start(t *testing.T) {
func TestUp(t *testing.T) {
defer iface.Close()
defer iface.Close("wt0")
tempDir := t.TempDir()
confPath := tempDir + "/config.json"

32
client/internal/cond.go
View File

@ -1,32 +0,0 @@
package internal
import "sync"
// A Cond is a condition variable like sync.Cond, but using a channel so we can use select.
type Cond struct {
once sync.Once
C chan struct{}
}
// NewCond creates a new condition variable.
func NewCond() *Cond {
return &Cond{C: make(chan struct{})}
}
// Do runs f if the condition hasn't been signaled yet. Afterwards it will be signaled.
func (c *Cond) Do(f func()) {
c.once.Do(func() {
f()
close(c.C)
})
}
// Signal closes the condition variable channel.
func (c *Cond) Signal() {
c.Do(func() {})
}
// Wait waits for the condition variable channel to close.
func (c *Cond) Wait() {
<-c.C
}

425
client/internal/connection.go
View File

@ -1,425 +0,0 @@
package internal
import (
"context"
"fmt"
ice "github.com/pion/ice/v2"
log "github.com/sirupsen/logrus"
"github.com/wiretrustee/wiretrustee/iface"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"net"
"sync"
"time"
)
var (
// DefaultWgKeepAlive default Wireguard keep alive constant
DefaultWgKeepAlive = 20 * time.Second
privateIPBlocks []*net.IPNet
)
type Status string
const (
StatusConnected Status = "Connected"
StatusConnecting Status = "Connecting"
StatusDisconnected Status = "Disconnected"
)
func init() {
for _, cidr := range []string{
"127.0.0.0/8", // IPv4 loopback
"10.0.0.0/8", // RFC1918
"172.16.0.0/12", // RFC1918
"192.168.0.0/16", // RFC1918
"169.254.0.0/16", // RFC3927 link-local
"::1/128", // IPv6 loopback
"fe80::/10", // IPv6 link-local
"fc00::/7", // IPv6 unique local addr
} {
_, block, err := net.ParseCIDR(cidr)
if err != nil {
panic(fmt.Errorf("parse error on %q: %v", cidr, err))
}
privateIPBlocks = append(privateIPBlocks, block)
}
}
// ConnConfig Connection configuration struct
type ConnConfig struct {
// Local Wireguard listening address e.g. 127.0.0.1:51820
WgListenAddr string
// A Local Wireguard Peer IP address in CIDR notation e.g. 10.30.30.1/24
WgPeerIP string
// Local Wireguard Interface name (e.g. wg0)
WgIface string
// Wireguard allowed IPs (e.g. 10.30.30.2/32)
WgAllowedIPs string
// Local Wireguard private key
WgKey wgtypes.Key
// Remote Wireguard public key
RemoteWgKey wgtypes.Key
PreSharedKey *wgtypes.Key
StunTurnURLS []*ice.URL
iFaceBlackList map[string]struct{}
}
// IceCredentials ICE protocol credentials struct
type IceCredentials struct {
uFrag string
pwd string
}
// Connection Holds information about a connection and handles signal protocol
type Connection struct {
Config ConnConfig
// signalCandidate is a handler function to signal remote peer about local connection candidate
signalCandidate func(candidate ice.Candidate) error
// signalOffer is a handler function to signal remote peer our connection offer (credentials)
signalOffer func(uFrag string, pwd string) error
// signalOffer is a handler function to signal remote peer our connection answer (credentials)
signalAnswer func(uFrag string, pwd string) error
// remoteAuthChannel is a channel used to wait for remote credentials to proceed with the connection
remoteAuthChannel chan IceCredentials
// agent is an actual ice.Agent that is used to negotiate and maintain a connection to a remote peer
agent *ice.Agent
wgProxy *WgProxy
connected *Cond
closeCond *Cond
remoteAuthCond sync.Once
Status Status
}
// NewConnection Creates a new connection and sets handling functions for signal protocol
func NewConnection(config ConnConfig,
signalCandidate func(candidate ice.Candidate) error,
signalOffer func(uFrag string, pwd string) error,
signalAnswer func(uFrag string, pwd string) error,
) *Connection {
return &Connection{
Config: config,
signalCandidate: signalCandidate,
signalOffer: signalOffer,
signalAnswer: signalAnswer,
remoteAuthChannel: make(chan IceCredentials, 1),
closeCond: NewCond(),
connected: NewCond(),
agent: nil,
wgProxy: NewWgProxy(config.WgIface, config.RemoteWgKey.String(), config.WgAllowedIPs, config.WgListenAddr, config.PreSharedKey),
Status: StatusDisconnected,
}
}
// Open opens connection to a remote peer.
// Will block until the connection has successfully established
func (conn *Connection) Open(timeout time.Duration) error {
// create an ice.Agent that will be responsible for negotiating and establishing actual peer-to-peer connection
a, err := ice.NewAgent(&ice.AgentConfig{
// MulticastDNSMode: ice.MulticastDNSModeQueryAndGather,
NetworkTypes: []ice.NetworkType{ice.NetworkTypeUDP4},
Urls: conn.Config.StunTurnURLS,
CandidateTypes: []ice.CandidateType{ice.CandidateTypeHost, ice.CandidateTypeServerReflexive, ice.CandidateTypeRelay},
InterfaceFilter: func(s string) bool {
if conn.Config.iFaceBlackList == nil {
return true
}
_, ok := conn.Config.iFaceBlackList[s]
return !ok
},
})
if err != nil {
return err
}
conn.agent = a
defer func() {
err := conn.agent.Close()
if err != nil {
return
}
}()
err = conn.listenOnLocalCandidates()
if err != nil {
return err
}
err = conn.listenOnConnectionStateChanges()
if err != nil {
return err
}
err = conn.signalCredentials()
if err != nil {
return err
}
conn.Status = StatusConnecting
log.Debugf("trying to connect to peer %s", conn.Config.RemoteWgKey.String())
// wait until credentials have been sent from the remote peer (will arrive via a signal server)
select {
case remoteAuth := <-conn.remoteAuthChannel:
log.Debugf("got a connection confirmation from peer %s", conn.Config.RemoteWgKey.String())
err = conn.agent.GatherCandidates()
if err != nil {
return err
}
isControlling := conn.Config.WgKey.PublicKey().String() > conn.Config.RemoteWgKey.String()
var remoteConn *ice.Conn
remoteConn, err = conn.openConnectionToRemote(isControlling, remoteAuth)
if err != nil {
log.Errorf("failed establishing connection with the remote peer %s %s", conn.Config.RemoteWgKey.String(), err)
return err
}
var pair *ice.CandidatePair
pair, err = conn.agent.GetSelectedCandidatePair()
if err != nil {
return err
}
useProxy := useProxy(pair)
// in case the remote peer is in the local network or one of the peers has public static IP -> no need for a Wireguard proxy, direct communication is possible.
if !useProxy {
log.Debugf("it is possible to establish a direct connection (without proxy) to peer %s - my addr: %s, remote addr: %s", conn.Config.RemoteWgKey.String(), pair.Local, pair.Remote)
err = conn.wgProxy.StartLocal(fmt.Sprintf("%s:%d", pair.Remote.Address(), iface.WgPort))
if err != nil {
return err
}
} else {
log.Debugf("establishing secure tunnel to peer %s via selected candidate pair %s", conn.Config.RemoteWgKey.String(), pair)
err = conn.wgProxy.Start(remoteConn)
if err != nil {
return err
}
}
relayed := pair.Remote.Type() == ice.CandidateTypeRelay || pair.Local.Type() == ice.CandidateTypeRelay
conn.Status = StatusConnected
log.Infof("opened connection to peer %s [localProxy=%v, relayed=%v]", conn.Config.RemoteWgKey.String(), useProxy, relayed)
case <-conn.closeCond.C:
conn.Status = StatusDisconnected
return fmt.Errorf("connection to peer %s has been closed", conn.Config.RemoteWgKey.String())
case <-time.After(timeout):
err = conn.Close()
if err != nil {
log.Warnf("error while closing connection to peer %s -> %s", conn.Config.RemoteWgKey.String(), err.Error())
}
conn.Status = StatusDisconnected
return fmt.Errorf("timeout of %vs exceeded while waiting for the remote peer %s", timeout.Seconds(), conn.Config.RemoteWgKey.String())
}
// wait until connection has been closed
<-conn.closeCond.C
conn.Status = StatusDisconnected
return fmt.Errorf("connection to peer %s has been closed", conn.Config.RemoteWgKey.String())
}
func isPublicIP(ip net.IP) bool {
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
return false
}
for _, block := range privateIPBlocks {
if block.Contains(ip) {
return false
}
}
return true
}
//useProxy determines whether a direct connection (without a go proxy) is possible
//There are 3 cases: one of the peers has a public IP or both peers are in the same private network
//Please note, that this check happens when peers were already able to ping each other with ICE layer.
func useProxy(pair *ice.CandidatePair) bool {
remoteIP := net.ParseIP(pair.Remote.Address())
myIp := net.ParseIP(pair.Local.Address())
remoteIsPublic := isPublicIP(remoteIP)
myIsPublic := isPublicIP(myIp)
//one of the hosts has a public IP
if remoteIsPublic && pair.Remote.Type() == ice.CandidateTypeHost {
return false
}
if myIsPublic && pair.Local.Type() == ice.CandidateTypeHost {
return false
}
if pair.Local.Type() == ice.CandidateTypeHost && pair.Remote.Type() == ice.CandidateTypeHost {
if !remoteIsPublic && !myIsPublic {
//both hosts are in the same private network
return false
}
}
return true
}
// Close Closes a peer connection
func (conn *Connection) Close() error {
var err error
conn.closeCond.Do(func() {
log.Debugf("closing connection to peer %s", conn.Config.RemoteWgKey.String())
if a := conn.agent; a != nil {
e := a.Close()
if e != nil {
log.Warnf("error while closing ICE agent of peer connection %s", conn.Config.RemoteWgKey.String())
err = e
}
}
if c := conn.wgProxy; c != nil {
e := c.Close()
if e != nil {
log.Warnf("error while closingWireguard proxy connection of peer connection %s", conn.Config.RemoteWgKey.String())
err = e
}
}
})
return err
}
// OnAnswer Handles the answer from the other peer
func (conn *Connection) OnAnswer(remoteAuth IceCredentials) error {
conn.remoteAuthCond.Do(func() {
log.Debugf("OnAnswer from peer %s", conn.Config.RemoteWgKey.String())
conn.remoteAuthChannel <- remoteAuth
})
return nil
}
// OnOffer Handles the offer from the other peer
func (conn *Connection) OnOffer(remoteAuth IceCredentials) error {
conn.remoteAuthCond.Do(func() {
log.Debugf("OnOffer from peer %s", conn.Config.RemoteWgKey.String())
conn.remoteAuthChannel <- remoteAuth
uFrag, pwd, err := conn.agent.GetLocalUserCredentials()
if err != nil { //nolint
}
err = conn.signalAnswer(uFrag, pwd)
if err != nil { //nolint
}
})
return nil
}
// OnRemoteCandidate Handles remote candidate provided by the peer.
func (conn *Connection) OnRemoteCandidate(candidate ice.Candidate) error {
log.Debugf("onRemoteCandidate from peer %s -> %s", conn.Config.RemoteWgKey.String(), candidate.String())
err := conn.agent.AddRemoteCandidate(candidate)
if err != nil {
return err
}
return nil
}
// openConnectionToRemote opens an ice.Conn to the remote peer. This is a real peer-to-peer connection
// blocks until connection has been established
func (conn *Connection) openConnectionToRemote(isControlling bool, credentials IceCredentials) (*ice.Conn, error) {
var realConn *ice.Conn
var err error
if isControlling {
realConn, err = conn.agent.Dial(context.TODO(), credentials.uFrag, credentials.pwd)
} else {
realConn, err = conn.agent.Accept(context.TODO(), credentials.uFrag, credentials.pwd)
}
if err != nil {
return nil, err
}
return realConn, err
}
// signalCredentials prepares local user credentials and signals them to the remote peer
func (conn *Connection) signalCredentials() error {
localUFrag, localPwd, err := conn.agent.GetLocalUserCredentials()
if err != nil {
return err
}
err = conn.signalOffer(localUFrag, localPwd)
if err != nil {
return err
}
return nil
}
// listenOnLocalCandidates registers callback of an ICE Agent to receive new local connection candidates and then
// signals them to the remote peer
func (conn *Connection) listenOnLocalCandidates() error {
err := conn.agent.OnCandidate(func(candidate ice.Candidate) {
if candidate != nil {
log.Debugf("discovered local candidate %s", candidate.String())
err := conn.signalCandidate(candidate)
if err != nil {
log.Errorf("failed signaling candidate to the remote peer %s %s", conn.Config.RemoteWgKey.String(), err)
//todo ??
return
}
}
})
if err != nil {
return err
}
return nil
}
// listenOnConnectionStateChanges registers callback of an ICE Agent to track connection state
func (conn *Connection) listenOnConnectionStateChanges() error {
err := conn.agent.OnConnectionStateChange(func(state ice.ConnectionState) {
log.Debugf("ICE Connection State has changed for peer %s -> %s", conn.Config.RemoteWgKey.String(), state.String())
if state == ice.ConnectionStateConnected {
// closed the connection has been established we can check the selected candidate pair
pair, err := conn.agent.GetSelectedCandidatePair()
if err != nil {
log.Errorf("failed selecting active ICE candidate pair %s", err)
return
}
log.Debugf("ICE connected to peer %s via a selected connnection candidate pair %s", conn.Config.RemoteWgKey.String(), pair)
} else if state == ice.ConnectionStateDisconnected || state == ice.ConnectionStateFailed {
err := conn.Close()
if err != nil {
log.Warnf("error while closing connection to peer %s -> %s", conn.Config.RemoteWgKey.String(), err.Error())
}
}
})
if err != nil {
return err
}
return nil
}

320
client/internal/engine.go
View File

@ -3,9 +3,10 @@ package internal
import (
"context"
"fmt"
"github.com/cenkalti/backoff/v4"
"github.com/pion/ice/v2"
log "github.com/sirupsen/logrus"
"github.com/wiretrustee/wiretrustee/client/internal/peer"
"github.com/wiretrustee/wiretrustee/client/internal/proxy"
"github.com/wiretrustee/wiretrustee/iface"
mgm "github.com/wiretrustee/wiretrustee/management/client"
mgmProto "github.com/wiretrustee/wiretrustee/management/proto"
@ -20,11 +21,14 @@ import (
// PeerConnectionTimeoutMax is a timeout of an initial connection attempt to a remote peer.
// E.g. this peer will wait PeerConnectionTimeoutMax for the remote peer to respond, if not successful then it will retry the connection attempt.
const PeerConnectionTimeoutMax = 45 //sec
const PeerConnectionTimeoutMin = 30 //sec
const PeerConnectionTimeoutMax = 45000 //ms
const PeerConnectionTimeoutMin = 30000 //ms
const WgPort = 51820
// EngineConfig is a config for the Engine
type EngineConfig struct {
WgPort int
WgIface string
// WgAddr is a Wireguard local address (Wiretrustee Network IP)
WgAddr string
@ -42,21 +46,13 @@ type Engine struct {
signal *signal.Client
// mgmClient is a Management Service client
mgmClient *mgm.Client
// conns is a collection of remote peer connections indexed by local public key of the remote peers
conns map[string]*Connection
// peerMap is a map that holds all the peers that are known to this peer
peerMap map[string]struct{}
// peerConns is a map that holds all the peers that are known to this peer
peerConns map[string]*peer.Conn
// peerMux is used to sync peer operations (e.g. open connection, peer removal)
peerMux *sync.Mutex
// syncMsgMux is used to guarantee sequential Management Service message processing
syncMsgMux *sync.Mutex
config *EngineConfig
// wgPort is a Wireguard local listen port
wgPort int
// STUNs is a list of STUN servers used by ICE
STUNs []*ice.URL
// TURNs is a list of STUN servers used by ICE
@ -78,9 +74,7 @@ func NewEngine(signalClient *signal.Client, mgmClient *mgm.Client, config *Engin
return &Engine{
signal: signalClient,
mgmClient: mgmClient,
conns: map[string]*Connection{},
peerMap: map[string]struct{}{},
peerMux: &sync.Mutex{},
peerConns: map[string]*peer.Conn{},
syncMsgMux: &sync.Mutex{},
config: config,
STUNs: []*ice.URL{},
@ -91,13 +85,16 @@ func NewEngine(signalClient *signal.Client, mgmClient *mgm.Client, config *Engin
}
func (e *Engine) Stop() error {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
err := e.removeAllPeerConnections()
if err != nil {
return err
}
log.Debugf("removing Wiretrustee interface %s", e.config.WgIface)
err = iface.Close()
err = iface.Close(e.config.WgIface)
if err != nil {
log.Errorf("failed closing Wiretrustee interface %s %v", e.config.WgIface, err)
return err
@ -112,6 +109,8 @@ func (e *Engine) Stop() error {
// Connections to remote peers are not established here.
// However, they will be established once an event with a list of peers to connect to will be received from Management Service
func (e *Engine) Start() error {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
wgIface := e.config.WgIface
wgAddr := e.config.WgAddr
@ -123,86 +122,33 @@ func (e *Engine) Start() error {
return err
}
err = iface.Configure(wgIface, myPrivateKey.String())
err = iface.Configure(wgIface, myPrivateKey.String(), e.config.WgPort)
if err != nil {
log.Errorf("failed configuring Wireguard interface [%s]: %s", wgIface, err.Error())
return err
}
port, err := iface.GetListenPort(wgIface)
if err != nil {
log.Errorf("failed getting Wireguard listen port [%s]: %s", wgIface, err.Error())
return err
}
e.wgPort = *port
e.receiveSignalEvents()
e.receiveManagementEvents()
return nil
}
// initializePeer peer agent attempt to open connection
func (e *Engine) initializePeer(peer Peer) {
e.peerMap[peer.WgPubKey] = struct{}{}
var backOff = backoff.WithContext(&backoff.ExponentialBackOff{
InitialInterval: backoff.DefaultInitialInterval,
RandomizationFactor: backoff.DefaultRandomizationFactor,
Multiplier: backoff.DefaultMultiplier,
MaxInterval: 5 * time.Second,
MaxElapsedTime: 0, //never stop
Stop: backoff.Stop,
Clock: backoff.SystemClock,
}, e.ctx)
operation := func() error {
if e.signal.GetStatus() != signal.StreamConnected {
return fmt.Errorf("not opening connection to peer because Signal is unavailable")
}
_, err := e.openPeerConnection(e.wgPort, e.config.WgPrivateKey, peer)
e.peerMux.Lock()
defer e.peerMux.Unlock()
if _, ok := e.peerMap[peer.WgPubKey]; !ok {
log.Debugf("peer was removed: %v, stop connecting", peer.WgPubKey)
return nil
}
if err != nil {
log.Debugf("retrying connection because of error: %s", err.Error())
return err
}
return nil
}
go func() {
err := backoff.Retry(operation, backOff)
if err != nil {
// should actually never happen
panic(err)
}
}()
}
func (e *Engine) removePeers(peers []string) error {
for _, peer := range peers {
err := e.removePeer(peer)
for _, p := range peers {
err := e.removePeer(p)
if err != nil {
return err
}
log.Infof("removed peer %s", p)
}
return nil
}
func (e *Engine) removeAllPeerConnections() error {
log.Debugf("removing all peer connections")
e.peerMux.Lock()
defer e.peerMux.Unlock()
for peer := range e.conns {
err := e.removePeer(peer)
for p := range e.peerConns {
err := e.removePeer(p)
if err != nil {
return err
}
@ -212,69 +158,39 @@ func (e *Engine) removeAllPeerConnections() error {
// removePeer closes an existing peer connection and removes a peer
func (e *Engine) removePeer(peerKey string) error {
delete(e.peerMap, peerKey)
conn, exists := e.conns[peerKey]
if exists && conn != nil {
delete(e.conns, peerKey)
log.Debugf("removing peer from engine %s", peerKey)
conn, exists := e.peerConns[peerKey]
if exists {
delete(e.peerConns, peerKey)
return conn.Close()
}
log.Infof("removed peer %s", peerKey)
return nil
}
// GetPeerConnectionStatus returns a connection Status or nil if peer connection wasn't found
func (e *Engine) GetPeerConnectionStatus(peerKey string) *Status {
e.peerMux.Lock()
defer e.peerMux.Unlock()
func (e *Engine) GetPeerConnectionStatus(peerKey string) peer.ConnStatus {
conn, exists := e.conns[peerKey]
conn, exists := e.peerConns[peerKey]
if exists && conn != nil {
return &conn.Status
return conn.Status()
}
return nil
return -1
}
// openPeerConnection opens a new remote peer connection
func (e *Engine) openPeerConnection(wgPort int, myKey wgtypes.Key, peer Peer) (*Connection, error) {
// GetConnectedPeers returns a connection Status or nil if peer connection wasn't found
func (e *Engine) GetConnectedPeers() []string {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
remoteKey, _ := wgtypes.ParseKey(peer.WgPubKey)
connConfig := &ConnConfig{
WgListenAddr: fmt.Sprintf("127.0.0.1:%d", wgPort),
WgPeerIP: e.config.WgAddr,
WgIface: e.config.WgIface,
WgAllowedIPs: peer.WgAllowedIps,
WgKey: myKey,
RemoteWgKey: remoteKey,
StunTurnURLS: append(e.STUNs, e.TURNs...),
iFaceBlackList: e.config.IFaceBlackList,
PreSharedKey: e.config.PreSharedKey,
peers := []string{}
for s, conn := range e.peerConns {
if conn.Status() == peer.StatusConnected {
peers = append(peers, s)
}
}
signalOffer := func(uFrag string, pwd string) error {
return signalAuth(uFrag, pwd, myKey, remoteKey, e.signal, false)
}
signalAnswer := func(uFrag string, pwd string) error {
return signalAuth(uFrag, pwd, myKey, remoteKey, e.signal, true)
}
signalCandidate := func(candidate ice.Candidate) error {
return signalCandidate(candidate, myKey, remoteKey, e.signal)
}
conn := NewConnection(*connConfig, signalCandidate, signalOffer, signalAnswer)
e.peerMux.Lock()
e.conns[remoteKey.String()] = conn
e.peerMux.Unlock()
// blocks until the connection is open (or timeout)
timeout := rand.Intn(PeerConnectionTimeoutMax-PeerConnectionTimeoutMin) + PeerConnectionTimeoutMin
err := conn.Open(time.Duration(timeout) * time.Second)
if err != nil {
return nil, err
}
return conn, nil
return peers
}
func signalCandidate(candidate ice.Candidate, myKey wgtypes.Key, remoteKey wgtypes.Key, s *signal.Client) error {
@ -400,17 +316,15 @@ func (e *Engine) updateTURNs(turns []*mgmProto.ProtectedHostConfig) error {
}
func (e *Engine) updatePeers(remotePeers []*mgmProto.RemotePeerConfig) error {
e.peerMux.Lock()
defer e.peerMux.Unlock()
log.Debugf("got peers update from Management Service, total peers to connect to = %d", len(remotePeers))
remotePeerMap := make(map[string]struct{})
for _, peer := range remotePeers {
remotePeerMap[peer.GetWgPubKey()] = struct{}{}
for _, p := range remotePeers {
remotePeerMap[p.GetWgPubKey()] = struct{}{}
}
//remove peers that are no longer available for us
toRemove := []string{}
for p := range e.conns {
for p := range e.peerConns {
if _, ok := remotePeerMap[p]; !ok {
toRemove = append(toRemove, p)
}
@ -421,20 +335,115 @@ func (e *Engine) updatePeers(remotePeers []*mgmProto.RemotePeerConfig) error {
}
// add new peers
for _, peer := range remotePeers {
peerKey := peer.GetWgPubKey()
peerIPs := peer.GetAllowedIps()
if _, ok := e.peerMap[peerKey]; !ok {
e.initializePeer(Peer{
WgPubKey: peerKey,
WgAllowedIps: strings.Join(peerIPs, ","),
})
for _, p := range remotePeers {
peerKey := p.GetWgPubKey()
peerIPs := p.GetAllowedIps()
if _, ok := e.peerConns[peerKey]; !ok {
conn, err := e.createPeerConn(peerKey, strings.Join(peerIPs, ","))
if err != nil {
return err
}
e.peerConns[peerKey] = conn
go e.connWorker(conn, peerKey)
}
}
return nil
}
func (e Engine) connWorker(conn *peer.Conn, peerKey string) {
for {
// randomize starting time a bit
min := 500
max := 2000
time.Sleep(time.Duration(rand.Intn(max-min)+min) * time.Millisecond)
// if peer has been removed -> give up
if !e.peerExists(peerKey) {
log.Infof("peer %s doesn't exist anymore, won't retry connection", peerKey)
return
}
if !e.signal.Ready() {
log.Infof("signal client isn't ready, skipping connection attempt %s", peerKey)
continue
}
err := conn.Open()
if err != nil {
log.Debugf("connection to peer %s failed: %v", peerKey, err)
}
}
}
func (e Engine) peerExists(peerKey string) bool {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
_, ok := e.peerConns[peerKey]
return ok
}
func (e Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, error) {
var stunTurn []*ice.URL
stunTurn = append(stunTurn, e.STUNs...)
stunTurn = append(stunTurn, e.TURNs...)
interfaceBlacklist := make([]string, 0, len(e.config.IFaceBlackList))
for k := range e.config.IFaceBlackList {
interfaceBlacklist = append(interfaceBlacklist, k)
}
proxyConfig := proxy.Config{
RemoteKey: pubKey,
WgListenAddr: fmt.Sprintf("127.0.0.1:%d", e.config.WgPort),
WgInterface: e.config.WgIface,
AllowedIps: allowedIPs,
PreSharedKey: e.config.PreSharedKey,
}
// randomize connection timeout
timeout := time.Duration(rand.Intn(PeerConnectionTimeoutMax-PeerConnectionTimeoutMin)+PeerConnectionTimeoutMin) * time.Millisecond
config := peer.ConnConfig{
Key: pubKey,
LocalKey: e.config.WgPrivateKey.PublicKey().String(),
StunTurn: stunTurn,
InterfaceBlackList: interfaceBlacklist,
Timeout: timeout,
ProxyConfig: proxyConfig,
}
peerConn, err := peer.NewConn(config)
if err != nil {
return nil, err
}
wgPubKey, err := wgtypes.ParseKey(pubKey)
if err != nil {
return nil, err
}
signalOffer := func(uFrag string, pwd string) error {
return signalAuth(uFrag, pwd, e.config.WgPrivateKey, wgPubKey, e.signal, false)
}
signalCandidate := func(candidate ice.Candidate) error {
return signalCandidate(candidate, e.config.WgPrivateKey, wgPubKey, e.signal)
}
signalAnswer := func(uFrag string, pwd string) error {
return signalAuth(uFrag, pwd, e.config.WgPrivateKey, wgPubKey, e.signal, true)
}
peerConn.SetSignalCandidate(signalCandidate)
peerConn.SetSignalOffer(signalOffer)
peerConn.SetSignalAnswer(signalAnswer)
return peerConn, nil
}
// receiveSignalEvents connects to the Signal Service event stream to negotiate connection with remote peers
func (e *Engine) receiveSignalEvents() {
@ -445,58 +454,37 @@ func (e *Engine) receiveSignalEvents() {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
conn := e.conns[msg.Key]
conn := e.peerConns[msg.Key]
if conn == nil {
return fmt.Errorf("wrongly addressed message %s", msg.Key)
}
if conn.Config.RemoteWgKey.String() != msg.Key {
return fmt.Errorf("unknown peer %s", msg.Key)
}
switch msg.GetBody().Type {
case sProto.Body_OFFER:
remoteCred, err := signal.UnMarshalCredential(msg)
if err != nil {
return err
}
err = conn.OnOffer(IceCredentials{
uFrag: remoteCred.UFrag,
pwd: remoteCred.Pwd,
conn.OnRemoteOffer(peer.IceCredentials{
UFrag: remoteCred.UFrag,
Pwd: remoteCred.Pwd,
})
if err != nil {
return err
}
return nil
case sProto.Body_ANSWER:
remoteCred, err := signal.UnMarshalCredential(msg)
if err != nil {
return err
}
err = conn.OnAnswer(IceCredentials{
uFrag: remoteCred.UFrag,
pwd: remoteCred.Pwd,
conn.OnRemoteAnswer(peer.IceCredentials{
UFrag: remoteCred.UFrag,
Pwd: remoteCred.Pwd,
})
if err != nil {
return err
}
case sProto.Body_CANDIDATE:
candidate, err := ice.UnmarshalCandidate(msg.GetBody().Payload)
if err != nil {
log.Errorf("failed on parsing remote candidate %s -> %s", candidate, err)
return err
}
err = conn.OnRemoteCandidate(candidate)
if err != nil {
log.Errorf("error handling CANDIATE from %s", msg.Key)
return err
}
conn.OnRemoteCandidate(candidate)
}
return nil

208
client/internal/engine_test.go Normal file
View File

@ -0,0 +1,208 @@
package internal
import (
"context"
"fmt"
log "github.com/sirupsen/logrus"
mgmt "github.com/wiretrustee/wiretrustee/management/client"
mgmtProto "github.com/wiretrustee/wiretrustee/management/proto"
"github.com/wiretrustee/wiretrustee/management/server"
signal "github.com/wiretrustee/wiretrustee/signal/client"
"github.com/wiretrustee/wiretrustee/signal/proto"
signalServer "github.com/wiretrustee/wiretrustee/signal/server"
"github.com/wiretrustee/wiretrustee/util"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"net"
"os"
"path/filepath"
"runtime"
"sync"
"testing"
"time"
)
var (
kaep = keepalive.EnforcementPolicy{
MinTime: 15 * time.Second,
PermitWithoutStream: true,
}
kasp = keepalive.ServerParameters{
MaxConnectionIdle: 15 * time.Second,
MaxConnectionAgeGrace: 5 * time.Second,
Time: 5 * time.Second,
Timeout: 2 * time.Second,
}
)
func TestEngine_MultiplePeers(t *testing.T) {
//log.SetLevel(log.DebugLevel)
dir := t.TempDir()
err := util.CopyFileContents("../testdata/store.json", filepath.Join(dir, "store.json"))
if err != nil {
t.Fatal(err)
}
defer func() {
os.Remove(filepath.Join(dir, "store.json")) //nolint
}()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
signalServer, err := startSignal(10000)
if err != nil {
t.Fatal(err)
return
}
defer signalServer.Stop()
mgmtServer, err := startManagement(33071, &server.Config{
Stuns: []*server.Host{},
TURNConfig: &server.TURNConfig{},
Signal: &server.Host{
Proto: "http",
URI: "localhost:10000",
},
Datadir: dir,
HttpConfig: nil,
})
if err != nil {
t.Fatal(err)
return
}
defer mgmtServer.Stop()
setupKey := "A2C8E62B-38F5-4553-B31E-DD66C696CEBB"
mu := sync.Mutex{}
engines := []*Engine{}
numPeers := 10
wg := sync.WaitGroup{}
wg.Add(numPeers)
// create and start peers
for i := 0; i < numPeers; i++ {
j := i
go func() {
engine, err := createEngine(ctx, cancel, setupKey, j)
if err != nil {
return
}
mu.Lock()
defer mu.Unlock()
engine.Start() //nolint
engines = append(engines, engine)
wg.Done()
}()
}
// wait until all have been created and started
wg.Wait()
// check whether all the peer have expected peers connected
expectedConnected := numPeers * (numPeers - 1)
for {
time.Sleep(time.Second)
totalConnected := 0
for _, engine := range engines {
totalConnected = totalConnected + len(engine.GetConnectedPeers())
}
if totalConnected == expectedConnected {
break
}
log.Infof("total connected=%d", totalConnected)
}
}
func createEngine(ctx context.Context, cancel context.CancelFunc, setupKey string, i int) (*Engine, error) {
key, err := wgtypes.GenerateKey()
if err != nil {
return nil, err
}
mgmtClient, err := mgmt.NewClient(ctx, "localhost:33071", key, false)
if err != nil {
return nil, err
}
signalClient, err := signal.NewClient(ctx, "localhost:10000", key, false)
if err != nil {
return nil, err
}
publicKey, err := mgmtClient.GetServerPublicKey()
if err != nil {
return nil, err
}
resp, err := mgmtClient.Register(*publicKey, setupKey)
if err != nil {
return nil, err
}
var ifaceName string
if runtime.GOOS == "darwin" {
ifaceName = fmt.Sprintf("utun1%d", i)
} else {
ifaceName = fmt.Sprintf("wt%d", i)
}
conf := &EngineConfig{
WgIface: ifaceName,
WgAddr: resp.PeerConfig.Address,
WgPrivateKey: key,
WgPort: 33100 + i,
}
return NewEngine(signalClient, mgmtClient, conf, cancel, ctx), nil
}
func startSignal(port int) (*grpc.Server, error) {
s := grpc.NewServer(grpc.KeepaliveEnforcementPolicy(kaep), grpc.KeepaliveParams(kasp))
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
proto.RegisterSignalExchangeServer(s, signalServer.NewServer())
go func() {
if err = s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}()
return s, nil
}
func startManagement(port int, config *server.Config) (*grpc.Server, error) {
lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
if err != nil {
return nil, err
}
s := grpc.NewServer(grpc.KeepaliveEnforcementPolicy(kaep), grpc.KeepaliveParams(kasp))
store, err := server.NewStore(config.Datadir)
if err != nil {
log.Fatalf("failed creating a store: %s: %v", config.Datadir, err)
}
peersUpdateManager := server.NewPeersUpdateManager()
accountManager := server.NewManager(store, peersUpdateManager)
turnManager := server.NewTimeBasedAuthSecretsManager(peersUpdateManager, config.TURNConfig)
mgmtServer, err := server.NewServer(config, accountManager, peersUpdateManager, turnManager)
if err != nil {
return nil, err
}
mgmtProto.RegisterManagementServiceServer(s, mgmtServer)
go func() {
if err = s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}()
return s, nil
}

421
client/internal/peer/conn.go Normal file
View File

@ -0,0 +1,421 @@
package peer
import (
"context"
"github.com/pion/ice/v2"
log "github.com/sirupsen/logrus"
"github.com/wiretrustee/wiretrustee/client/internal/proxy"
"net"
"sync"
"time"
)
// ConnConfig is a peer Connection configuration
type ConnConfig struct {
// Key is a public key of a remote peer
Key string
// LocalKey is a public key of a local peer
LocalKey string
// StunTurn is a list of STUN and TURN URLs
StunTurn []*ice.URL
// InterfaceBlackList is a list of machine interfaces that should be filtered out by ICE Candidate gathering
// (e.g. if eth0 is in the list, host candidate of this interface won't be used)
InterfaceBlackList []string
Timeout time.Duration
ProxyConfig proxy.Config
}
// IceCredentials ICE protocol credentials struct
type IceCredentials struct {
UFrag string
Pwd string
}
type Conn struct {
config ConnConfig
mu sync.Mutex
// signalCandidate is a handler function to signal remote peer about local connection candidate
signalCandidate func(candidate ice.Candidate) error
// signalOffer is a handler function to signal remote peer our connection offer (credentials)
signalOffer func(uFrag string, pwd string) error
signalAnswer func(uFrag string, pwd string) error
// remoteOffersCh is a channel used to wait for remote credentials to proceed with the connection
remoteOffersCh chan IceCredentials
// remoteAnswerCh is a channel used to wait for remote credentials answer (confirmation of our offer) to proceed with the connection
remoteAnswerCh chan IceCredentials
closeCh chan struct{}
ctx context.Context
notifyDisconnected context.CancelFunc
agent *ice.Agent
status ConnStatus
proxy proxy.Proxy
}
// NewConn creates a new not opened Conn to the remote peer.
// To establish a connection run Conn.Open
func NewConn(config ConnConfig) (*Conn, error) {
return &Conn{
config: config,
mu: sync.Mutex{},
status: StatusDisconnected,
closeCh: make(chan struct{}),
remoteOffersCh: make(chan IceCredentials),
remoteAnswerCh: make(chan IceCredentials),
}, nil
}
// interfaceFilter is a function passed to ICE Agent to filter out blacklisted interfaces
func interfaceFilter(blackList []string) func(string) bool {
var blackListMap map[string]struct{}
if blackList != nil {
blackListMap = make(map[string]struct{})
for _, s := range blackList {
blackListMap[s] = struct{}{}
}
}
return func(iFace string) bool {
if len(blackListMap) == 0 {
return true
}
_, ok := blackListMap[iFace]
return !ok
}
}
func (conn *Conn) reCreateAgent() error {
conn.mu.Lock()
defer conn.mu.Unlock()
failedTimeout := 6 * time.Second
var err error
conn.agent, err = ice.NewAgent(&ice.AgentConfig{
MulticastDNSMode: ice.MulticastDNSModeDisabled,
NetworkTypes: []ice.NetworkType{ice.NetworkTypeUDP4},
Urls: conn.config.StunTurn,
CandidateTypes: []ice.CandidateType{ice.CandidateTypeHost, ice.CandidateTypeServerReflexive, ice.CandidateTypeRelay},
FailedTimeout: &failedTimeout,
InterfaceFilter: interfaceFilter(conn.config.InterfaceBlackList),
})
if err != nil {
return err
}
err = conn.agent.OnCandidate(conn.onICECandidate)
if err != nil {
return err
}
err = conn.agent.OnConnectionStateChange(conn.onICEConnectionStateChange)
if err != nil {
return err
}
err = conn.agent.OnSelectedCandidatePairChange(conn.onICESelectedCandidatePair)
if err != nil {
return err
}
return nil
}
// Open opens connection to the remote peer starting ICE candidate gathering process.
// Blocks until connection has been closed or connection timeout.
// ConnStatus will be set accordingly
func (conn *Conn) Open() error {
log.Debugf("trying to connect to peer %s", conn.config.Key)
defer func() {
err := conn.cleanup()
if err != nil {
log.Errorf("error while cleaning up peer connection %s: %v", conn.config.Key, err)
return
}
}()
err := conn.reCreateAgent()
if err != nil {
return err
}
err = conn.sendOffer()
if err != nil {
return err
}
log.Debugf("connection offer sent to peer %s, waiting for the confirmation", conn.config.Key)
// Only continue once we got a connection confirmation from the remote peer.
// The connection timeout could have happened before a confirmation received from the remote.
// The connection could have also been closed externally (e.g. when we received an update from the management that peer shouldn't be connected)
var remoteCredentials IceCredentials
select {
case remoteCredentials = <-conn.remoteOffersCh:
// received confirmation from the remote peer -> ready to proceed
err = conn.sendAnswer()
if err != nil {
return err
}
case remoteCredentials = <-conn.remoteAnswerCh:
case <-time.After(conn.config.Timeout):
return NewConnectionTimeoutError(conn.config.Key, conn.config.Timeout)
case <-conn.closeCh:
// closed externally
return NewConnectionClosedError(conn.config.Key)
}
log.Debugf("received connection confirmation from peer %s", conn.config.Key)
//at this point we received offer/answer and we are ready to gather candidates
conn.mu.Lock()
conn.status = StatusConnecting
conn.ctx, conn.notifyDisconnected = context.WithCancel(context.Background())
defer conn.notifyDisconnected()
conn.mu.Unlock()
err = conn.agent.GatherCandidates()
if err != nil {
return err
}
// will block until connection succeeded
// but it won't release if ICE Agent went into Disconnected or Failed state,
// so we have to cancel it with the provided context once agent detected a broken connection
isControlling := conn.config.LocalKey > conn.config.Key
var remoteConn *ice.Conn
if isControlling {
remoteConn, err = conn.agent.Dial(conn.ctx, remoteCredentials.UFrag, remoteCredentials.Pwd)
} else {
remoteConn, err = conn.agent.Accept(conn.ctx, remoteCredentials.UFrag, remoteCredentials.Pwd)
}
if err != nil {
return err
}
// the connection has been established successfully so we are ready to start the proxy
err = conn.startProxy(remoteConn)
if err != nil {
return err
}
log.Infof("connected to peer %s [laddr <-> raddr] [%s <-> %s]", conn.config.Key, remoteConn.LocalAddr().String(), remoteConn.RemoteAddr().String())
// wait until connection disconnected or has been closed externally (upper layer, e.g. engine)
select {
case <-conn.closeCh:
// closed externally
return NewConnectionClosedError(conn.config.Key)
case <-conn.ctx.Done():
// disconnected from the remote peer
return NewConnectionDisconnectedError(conn.config.Key)
}
}
// startProxy starts proxying traffic from/to local Wireguard and sets connection status to StatusConnected
func (conn *Conn) startProxy(remoteConn net.Conn) error {
conn.mu.Lock()
defer conn.mu.Unlock()
conn.proxy = proxy.NewWireguardProxy(conn.config.ProxyConfig)
err := conn.proxy.Start(remoteConn)
if err != nil {
return err
}
conn.status = StatusConnected
return nil
}
// cleanup closes all open resources and sets status to StatusDisconnected
func (conn *Conn) cleanup() error {
log.Debugf("trying to cleanup %s", conn.config.Key)
conn.mu.Lock()
defer conn.mu.Unlock()
if conn.agent != nil {
err := conn.agent.Close()
if err != nil {
return err
}
conn.agent = nil
}
if conn.proxy != nil {
err := conn.proxy.Close()
if err != nil {
return err
}
conn.proxy = nil
}
if conn.notifyDisconnected != nil {
conn.notifyDisconnected()
conn.notifyDisconnected = nil
}
conn.status = StatusDisconnected
log.Debugf("cleaned up connection to peer %s", conn.config.Key)
return nil
}
// SetSignalOffer sets a handler function to be triggered by Conn when a new connection offer has to be signalled to the remote peer
func (conn *Conn) SetSignalOffer(handler func(uFrag string, pwd string) error) {
conn.signalOffer = handler
}
// SetSignalAnswer sets a handler function to be triggered by Conn when a new connection answer has to be signalled to the remote peer
func (conn *Conn) SetSignalAnswer(handler func(uFrag string, pwd string) error) {
conn.signalAnswer = handler
}
// SetSignalCandidate sets a handler function to be triggered by Conn when a new ICE local connection candidate has to be signalled to the remote peer
func (conn *Conn) SetSignalCandidate(handler func(candidate ice.Candidate) error) {
conn.signalCandidate = handler
}
// onICECandidate is a callback attached to an ICE Agent to receive new local connection candidates
// and then signals them to the remote peer
func (conn *Conn) onICECandidate(candidate ice.Candidate) {
if candidate != nil {
//log.Debugf("discovered local candidate %s", candidate.String())
go func() {
err := conn.signalCandidate(candidate)
if err != nil {
log.Errorf("failed signaling candidate to the remote peer %s %s", conn.config.Key, err)
}
}()
}
}
func (conn *Conn) onICESelectedCandidatePair(c1 ice.Candidate, c2 ice.Candidate) {
log.Debugf("selected candidate pair [local <-> remote] -> [%s <-> %s], peer %s", conn.config.Key,
c1.String(), c2.String())
}
// onICEConnectionStateChange registers callback of an ICE Agent to track connection state
func (conn *Conn) onICEConnectionStateChange(state ice.ConnectionState) {
log.Debugf("peer %s ICE ConnectionState has changed to %s", conn.config.Key, state.String())
if state == ice.ConnectionStateFailed || state == ice.ConnectionStateDisconnected {
conn.notifyDisconnected()
}
}
func (conn *Conn) sendAnswer() error {
conn.mu.Lock()
defer conn.mu.Unlock()
localUFrag, localPwd, err := conn.agent.GetLocalUserCredentials()
if err != nil {
return err
}
log.Debugf("sending asnwer to %s", conn.config.Key)
err = conn.signalAnswer(localUFrag, localPwd)
if err != nil {
return err
}
return nil
}
// sendOffer prepares local user credentials and signals them to the remote peer
func (conn *Conn) sendOffer() error {
conn.mu.Lock()
defer conn.mu.Unlock()
localUFrag, localPwd, err := conn.agent.GetLocalUserCredentials()
if err != nil {
return err
}
err = conn.signalOffer(localUFrag, localPwd)
if err != nil {
return err
}
return nil
}
// Close closes this peer Conn issuing a close event to the Conn closeCh
func (conn *Conn) Close() error {
conn.mu.Lock()
defer conn.mu.Unlock()
select {
case conn.closeCh <- struct{}{}:
default:
// probably could happen when peer has been added and removed right after not even starting to connect
// todo further investigate
// this really happens due to unordered messages coming from management
// more importantly it causes inconsistency -> 2 Conn objects for the same peer
// e.g. this flow:
// update from management has peers: [1,2,3,4]
// engine creates a Conn for peers: [1,2,3,4] and schedules Open in ~1sec
// before conn.Open() another update from management arrives with peers: [1,2,3]
// engine removes peer 4 and calls conn.Close() which does nothing (this default clause)
// before conn.Open() another update from management arrives with peers: [1,2,3,4,5]
// engine adds a new Conn for 4 and 5
// therefore peer 4 has 2 Conn objects
log.Warnf("closing not started coonection %s", conn.config.Key)
}
return nil
}
// Status returns current status of the Conn
func (conn *Conn) Status() ConnStatus {
conn.mu.Lock()
defer conn.mu.Unlock()
return conn.status
}
// OnRemoteOffer handles an offer from the remote peer
// can block until Conn restarts
func (conn *Conn) OnRemoteOffer(remoteAuth IceCredentials) {
log.Debugf("OnRemoteOffer from peer %s on status %s", conn.config.Key, conn.status.String())
select {
case conn.remoteOffersCh <- remoteAuth:
default:
log.Debugf("OnRemoteOffer skipping message from peer %s on status %s because is not ready", conn.config.Key, conn.status.String())
//connection might not be ready yet to receive so we ignore the message
}
}
// OnRemoteAnswer handles an offer from the remote peer
// can block until Conn restarts
func (conn *Conn) OnRemoteAnswer(remoteAuth IceCredentials) {
log.Debugf("OnRemoteAnswer from peer %s on status %s", conn.config.Key, conn.status.String())
select {
case conn.remoteAnswerCh <- remoteAuth:
default:
//connection might not be ready yet to receive so we ignore the message
log.Debugf("OnRemoteAnswer skipping message from peer %s on status %s because is not ready", conn.config.Key, conn.status.String())
}
}
// OnRemoteCandidate Handles ICE connection Candidate provided by the remote peer.
func (conn *Conn) OnRemoteCandidate(candidate ice.Candidate) {
log.Debugf("OnRemoteCandidate from peer %s -> %s", conn.config.Key, candidate.String())
go func() {
conn.mu.Lock()
defer conn.mu.Unlock()
if conn.agent == nil {
return
}
err := conn.agent.AddRemoteCandidate(candidate)
if err != nil {
log.Errorf("error while handling remote candidate from peer %s", conn.config.Key)
return
}
}()
}

56
client/internal/peer/error.go Normal file
View File

@ -0,0 +1,56 @@
package peer
import (
"fmt"
"time"
)
// ConnectionTimeoutError is an error indicating that a peer Conn has been timed out
type ConnectionTimeoutError struct {
peer string
timeout time.Duration
}
func (e *ConnectionTimeoutError) Error() string {
return fmt.Sprintf("connection to peer %s timed out after %s", e.peer, e.timeout.String())
}
// NewConnectionTimeoutError creates a new ConnectionTimeoutError error
func NewConnectionTimeoutError(peer string, timeout time.Duration) error {
return &ConnectionTimeoutError{
peer: peer,
timeout: timeout,
}
}
// ConnectionClosedError is an error indicating that a peer Conn has been forcefully closed
type ConnectionClosedError struct {
peer string
}
func (e *ConnectionClosedError) Error() string {
return fmt.Sprintf("connection to peer %s has been closed", e.peer)
}
// NewConnectionClosedError creates a new ConnectionClosedError error
func NewConnectionClosedError(peer string) error {
return &ConnectionClosedError{
peer: peer,
}
}
// ConnectionDisconnectedError is an error indicating that a peer Conn has ctx from the remote
type ConnectionDisconnectedError struct {
peer string
}
func (e *ConnectionDisconnectedError) Error() string {
return fmt.Sprintf("disconnected from peer %s", e.peer)
}
// NewConnectionDisconnectedError creates a new ConnectionDisconnectedError error
func NewConnectionDisconnectedError(peer string) error {
return &ConnectionDisconnectedError{
peer: peer,
}
}

25
client/internal/peer/status.go Normal file
View File

@ -0,0 +1,25 @@
package peer
import log "github.com/sirupsen/logrus"
type ConnStatus int
func (s ConnStatus) String() string {
switch s {
case StatusConnecting:
return "StatusConnecting"
case StatusConnected:
return "StatusConnected"
case StatusDisconnected:
return "StatusDisconnected"
default:
log.Errorf("unknown status: %d", s)
return "INVALID_PEER_CONNECTION_STATUS"
}
}
const (
StatusConnected = iota
StatusConnecting
StatusDisconnected
)

68
client/internal/proxy/dummy.go Normal file
View File

@ -0,0 +1,68 @@
package proxy
import (
"context"
log "github.com/sirupsen/logrus"
"net"
"time"
)
// DummyProxy just sends pings to the RemoteKey peer and reads responses
type DummyProxy struct {
conn net.Conn
remote string
ctx context.Context
cancel context.CancelFunc
}
func NewDummyProxy(remote string) *DummyProxy {
p := &DummyProxy{remote: remote}
p.ctx, p.cancel = context.WithCancel(context.Background())
return p
}
func (p *DummyProxy) Close() error {
p.cancel()
return nil
}
func (p *DummyProxy) Start(remoteConn net.Conn) error {
p.conn = remoteConn
go func() {
buf := make([]byte, 1500)
for {
select {
case <-p.ctx.Done():
return
default:
_, err := p.conn.Read(buf)
if err != nil {
log.Errorf("error while reading RemoteKey %s proxy %v", p.remote, err)
return
}
//log.Debugf("received %s from %s", string(buf[:n]), p.remote)
}
}
}()
go func() {
for {
select {
case <-p.ctx.Done():
return
default:
_, err := p.conn.Write([]byte("hello"))
//log.Debugf("sent ping to %s", p.remote)
if err != nil {
log.Errorf("error while writing to RemoteKey %s proxy %v", p.remote, err)
return
}
time.Sleep(5 * time.Second)
}
}
}()
return nil
}

24
client/internal/proxy/proxy.go Normal file
View File

@ -0,0 +1,24 @@
package proxy
import (
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"io"
"net"
"time"
)
const DefaultWgKeepAlive = 25 * time.Second
type Config struct {
WgListenAddr string
RemoteKey string
WgInterface string
AllowedIps string
PreSharedKey *wgtypes.Key
}
type Proxy interface {
io.Closer
// Start creates a local remoteConn and starts proxying data from/to remoteConn
Start(remoteConn net.Conn) error
}

121
client/internal/proxy/wireguard.go Normal file
View File

@ -0,0 +1,121 @@
package proxy
import (
"context"
log "github.com/sirupsen/logrus"
"github.com/wiretrustee/wiretrustee/iface"
"net"
)
// WireguardProxy proxies
type WireguardProxy struct {
ctx context.Context
cancel context.CancelFunc
config Config
remoteConn net.Conn
localConn net.Conn
}
func NewWireguardProxy(config Config) *WireguardProxy {
p := &WireguardProxy{config: config}
p.ctx, p.cancel = context.WithCancel(context.Background())
return p
}
func (p *WireguardProxy) updateEndpoint() error {
// add local proxy connection as a Wireguard peer
err := iface.UpdatePeer(p.config.WgInterface, p.config.RemoteKey, p.config.AllowedIps, DefaultWgKeepAlive,
p.localConn.LocalAddr().String(), p.config.PreSharedKey)
if err != nil {
return err
}
return nil
}
func (p *WireguardProxy) Start(remoteConn net.Conn) error {
p.remoteConn = remoteConn
var err error
p.localConn, err = net.Dial("udp", p.config.WgListenAddr)
if err != nil {
log.Errorf("failed dialing to local Wireguard port %s", err)
return err
}
err = p.updateEndpoint()
if err != nil {
log.Errorf("error while updating Wireguard peer endpoint [%s] %v", p.config.RemoteKey, err)
return err
}
go p.proxyToRemote()
go p.proxyToLocal()
return nil
}
func (p *WireguardProxy) Close() error {
p.cancel()
if c := p.localConn; c != nil {
err := p.localConn.Close()
if err != nil {
return err
}
}
err := iface.RemovePeer(p.config.WgInterface, p.config.RemoteKey)
if err != nil {
return err
}
return nil
}
// proxyToRemote proxies everything from Wireguard to the RemoteKey peer
// blocks
func (p *WireguardProxy) proxyToRemote() {
buf := make([]byte, 1500)
for {
select {
case <-p.ctx.Done():
log.Debugf("stopped proxying to remote peer %s due to closed connection", p.config.RemoteKey)
return
default:
n, err := p.localConn.Read(buf)
if err != nil {
continue
}
_, err = p.remoteConn.Write(buf[:n])
if err != nil {
continue
}
}
}
}
// proxyToLocal proxies everything from the RemoteKey peer to local Wireguard
// blocks
func (p *WireguardProxy) proxyToLocal() {
buf := make([]byte, 1500)
for {
select {
case <-p.ctx.Done():
log.Debugf("stopped proxying from remote peer %s due to closed connection", p.config.RemoteKey)
return
default:
n, err := p.remoteConn.Read(buf)
if err != nil {
continue
}
_, err = p.localConn.Write(buf[:n])
if err != nil {
continue
}
}
}
}

131
client/internal/wgproxy.go
View File

@ -1,131 +0,0 @@
package internal
import (
ice "github.com/pion/ice/v2"
log "github.com/sirupsen/logrus"
"github.com/wiretrustee/wiretrustee/iface"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"net"
)
// WgProxy an instance of an instance of the Connection Wireguard Proxy
type WgProxy struct {
iface string
remoteKey string
allowedIps string
wgAddr string
close chan struct{}
wgConn net.Conn
preSharedKey *wgtypes.Key
}
// NewWgProxy creates a new Connection Wireguard Proxy
func NewWgProxy(iface string, remoteKey string, allowedIps string, wgAddr string, preSharedKey *wgtypes.Key) *WgProxy {
return &WgProxy{
iface: iface,
remoteKey: remoteKey,
allowedIps: allowedIps,
wgAddr: wgAddr,
close: make(chan struct{}),
preSharedKey: preSharedKey,
}
}
// Close closes the proxy
func (p *WgProxy) Close() error {
close(p.close)
if c := p.wgConn; c != nil {
err := p.wgConn.Close()
if err != nil {
return err
}
}
err := iface.RemovePeer(p.iface, p.remoteKey)
if err != nil {
return err
}
return nil
}
// StartLocal configure the interface with a peer using a direct IP:Port endpoint to the remote host
func (p *WgProxy) StartLocal(host string) error {
err := iface.UpdatePeer(p.iface, p.remoteKey, p.allowedIps, DefaultWgKeepAlive, host, p.preSharedKey)
if err != nil {
log.Errorf("error while configuring Wireguard peer [%s] %s", p.remoteKey, err.Error())
return err
}
return nil
}
// Start starts a new proxy using the ICE connection
func (p *WgProxy) Start(remoteConn *ice.Conn) error {
wgConn, err := net.Dial("udp", p.wgAddr)
if err != nil {
log.Fatalf("failed dialing to local Wireguard port %s", err)
return err
}
p.wgConn = wgConn
// add local proxy connection as a Wireguard peer
err = iface.UpdatePeer(p.iface, p.remoteKey, p.allowedIps, DefaultWgKeepAlive,
wgConn.LocalAddr().String(), p.preSharedKey)
if err != nil {
log.Errorf("error while configuring Wireguard peer [%s] %s", p.remoteKey, err.Error())
return err
}
go func() { p.proxyToRemotePeer(remoteConn) }()
go func() { p.proxyToLocalWireguard(remoteConn) }()
return err
}
// proxyToRemotePeer proxies everything from Wireguard to the remote peer
// blocks
func (p *WgProxy) proxyToRemotePeer(remoteConn *ice.Conn) {
buf := make([]byte, 1500)
for {
select {
case <-p.close:
log.Debugf("stopped proxying from remote peer %s due to closed connection", p.remoteKey)
return
default:
n, err := p.wgConn.Read(buf)
if err != nil {
continue
}
_, err = remoteConn.Write(buf[:n])
if err != nil {
continue
}
}
}
}
// proxyToLocalWireguard proxies everything from the remote peer to local Wireguard
// blocks
func (p *WgProxy) proxyToLocalWireguard(remoteConn *ice.Conn) {
buf := make([]byte, 1500)
for {
select {
case <-p.close:
log.Debugf("stopped proxying from remote peer %s due to closed connection", p.remoteKey)
return
default:
n, err := remoteConn.Read(buf)
if err != nil {
continue
}
_, err = p.wgConn.Write(buf[:n])
if err != nil {
continue
}
}
}
}

13
client/testdata/store.json vendored
View File

@ -11,6 +11,7 @@
"ExpiresAt": "2321-09-18T20:46:20.005936822+02:00",
"Revoked": false,
"UsedTimes": 0
}
},
"Network": {
@ -21,7 +22,17 @@
},
"Dns": null
},
"Peers": {}
"Peers": {},
"Users": {
"edafee4e-63fb-11ec-90d6-0242ac120003": {
"Id": "edafee4e-63fb-11ec-90d6-0242ac120003",
"Role": "admin"
},
"f4f6d672-63fb-11ec-90d6-0242ac120003": {
"Id": "f4f6d672-63fb-11ec-90d6-0242ac120003",
"Role": "user"
}
}
}
}
}

9
iface/iface.go
View File

@ -17,8 +17,6 @@ const (
var (
tunIface tun.Device
// todo check after move the WgPort constant to the client
WgPort = 51820
)
// CreateWithUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
@ -103,7 +101,7 @@ func Exists(iface string) (*bool, error) {
// Configure configures a Wireguard interface
// The interface must exist before calling this method (e.g. call interface.Create() before)
func Configure(iface string, privateKey string) error {
func Configure(iface string, privateKey string, port int) error {
log.Debugf("configuring Wireguard interface %s", iface)
@ -113,12 +111,11 @@ func Configure(iface string, privateKey string) error {
return err
}
fwmark := 0
p := WgPort
config := wgtypes.Config{
PrivateKey: &key,
ReplacePeers: false,
FirewallMark: &fwmark,
ListenPort: &p,
ListenPort: &port,
}
return configureDevice(iface, config)
@ -235,7 +232,7 @@ func RemovePeer(iface string, peerKey string) error {
return configureDevice(iface, config)
}
// Closes the User Space tunnel interface
// CloseWithUserspace closes the User Space tunnel interface
func CloseWithUserspace() error {
return tunIface.Close()
}

2
iface/iface_darwin.go
View File

@ -40,7 +40,7 @@ func addRoute(iface string, ipNet *net.IPNet) error {
}
// Closes the tunnel interface
func Close() error {
func Close(iFace string) error {
name, err := tunIface.Name()
if err != nil {
return err

28
iface/iface_linux.go
View File

@ -1,10 +1,8 @@
package iface
import (
"fmt"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"golang.zx2c4.com/wireguard/wgctrl"
"os"
)
@ -131,34 +129,14 @@ func (w *wgLink) Type() string {
return "wireguard"
}
// Closes the tunnel interface
func Close() error {
// Close closes the tunnel interface
func Close(iFace string) error {
if tunIface != nil {
return CloseWithUserspace()
} else {
var iface = ""
wg, err := wgctrl.New()
if err != nil {
return err
}
defer wg.Close()
devList, err := wg.Devices()
if err != nil {
return err
}
for _, wgDev := range devList {
// todo check after move the WgPort constant to the client
if wgDev.ListenPort == WgPort {
iface = wgDev.Name
break
}
}
if iface == "" {
return fmt.Errorf("Wireguard Interface not found")
}
attrs := netlink.NewLinkAttrs()
attrs.Name = iface
attrs.Name = iFace
link := wgLink{
attrs: &attrs,

34
iface/iface_test.go
View File

@ -14,6 +14,7 @@ import (
const (
key = "0PMI6OkB5JmB+Jj/iWWHekuQRx+bipZirWCWKFXexHc="
peerPubKey = "Ok0mC0qlJyXEPKh2UFIpsI2jG0L7LRpC3sLAusSJ5CQ="
WgPort = 51820
)
func init() {
@ -29,7 +30,7 @@ func Test_CreateInterface(t *testing.T) {
t.Fatal(err)
}
defer func() {
err = Close()
err = Close(ifaceName)
if err != nil {
t.Error(err)
}
@ -44,13 +45,6 @@ func Test_CreateInterface(t *testing.T) {
t.Error(err)
}
}()
d, err := wg.Device(ifaceName)
if err != nil {
t.Fatal(err)
}
// todo move the WgPort constant to the client
WgPort = d.ListenPort
}
func Test_ConfigureInterface(t *testing.T) {
ifaceName := "utun1000"
@ -60,13 +54,13 @@ func Test_ConfigureInterface(t *testing.T) {
t.Fatal(err)
}
defer func() {
err = Close()
err = Close(ifaceName)
if err != nil {
t.Error(err)
}
}()
err = Configure(ifaceName, key)
err = Configure(ifaceName, key, WgPort)
if err != nil {
t.Fatal(err)
}
@ -99,12 +93,12 @@ func Test_UpdatePeer(t *testing.T) {
t.Fatal(err)
}
defer func() {
err = Close()
err = Close(ifaceName)
if err != nil {
t.Error(err)
}
}()
err = Configure(ifaceName, key)
err = Configure(ifaceName, key, WgPort)
if err != nil {
t.Fatal(err)
}
@ -151,12 +145,12 @@ func Test_UpdatePeerEndpoint(t *testing.T) {
t.Fatal(err)
}
defer func() {
err = Close()
err = Close(ifaceName)
if err != nil {
t.Error(err)
}
}()
err = Configure(ifaceName, key)
err = Configure(ifaceName, key, WgPort)
if err != nil {
t.Fatal(err)
}
@ -192,12 +186,12 @@ func Test_RemovePeer(t *testing.T) {
t.Fatal(err)
}
defer func() {
err = Close()
err = Close(ifaceName)
if err != nil {
t.Error(err)
}
}()
err = Configure(ifaceName, key)
err = Configure(ifaceName, key, WgPort)
if err != nil {
t.Fatal(err)
}
@ -235,13 +229,7 @@ func Test_Close(t *testing.T) {
}
}()
d, err := wg.Device(ifaceName)
if err != nil {
t.Fatal(err)
}
// todo move the WgPort constant to the client
WgPort = d.ListenPort
err = Close()
err = Close(ifaceName)
if err != nil {
t.Fatal(err)
}

2
iface/iface_windows.go
View File

@ -41,6 +41,6 @@ func getUAPI(iface string) (net.Listener, error) {
}
// Closes the tunnel interface
func Close() error {
func Close(iFace string) error {
return CloseWithUserspace()
}

20
signal/client/client.go
View File

@ -45,6 +45,10 @@ type Client struct {
status Status
}
func (c *Client) StreamConnected() bool {
return c.status == StreamConnected
}
func (c *Client) GetStatus() Status {
return c.status
}
@ -117,7 +121,7 @@ func (c *Client) Receive(msgHandler func(msg *proto.Message) error) error {
c.notifyStreamDisconnected()
log.Debugf("signal connection state %v", c.signalConn.GetState())
if !c.ready() {
if !c.Ready() {
return fmt.Errorf("no connection to signal")
}
@ -204,9 +208,9 @@ func (c *Client) connect(key string) (proto.SignalExchange_ConnectStreamClient,
return stream, nil
}
// ready indicates whether the client is okay and ready to be used
// Ready indicates whether the client is okay and Ready to be used
// for now it just checks whether gRPC connection to the service is in state Ready
func (c *Client) ready() bool {
func (c *Client) Ready() bool {
return c.signalConn.GetState() == connectivity.Ready || c.signalConn.GetState() == connectivity.Idle
}
@ -228,7 +232,7 @@ func (c *Client) WaitStreamConnected() {
// The Client.Receive method must be called before sending messages to establish initial connection to the Signal Exchange
// Client.connWg can be used to wait
func (c *Client) SendToStream(msg *proto.EncryptedMessage) error {
if !c.ready() {
if !c.Ready() {
return fmt.Errorf("no connection to signal")
}
if c.stream == nil {
@ -287,7 +291,7 @@ func (c *Client) encryptMessage(msg *proto.Message) (*proto.EncryptedMessage, er
// Send sends a message to the remote Peer through the Signal Exchange.
func (c *Client) Send(msg *proto.Message) error {
if !c.ready() {
if !c.Ready() {
return fmt.Errorf("no connection to signal")
}
@ -295,9 +299,11 @@ func (c *Client) Send(msg *proto.Message) error {
if err != nil {
return err
}
_, err = c.realClient.Send(context.TODO(), encryptedMessage)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_, err = c.realClient.Send(ctx, encryptedMessage)
if err != nil {
//log.Errorf("error while sending message to peer [%s] [error: %v]", msg.RemoteKey, err)
return err
}

4
signal/cmd/run.go
View File

@ -74,10 +74,6 @@ var (
log.Fatalf("failed to listen: %v", err)
}
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
proto.RegisterSignalExchangeServer(grpcServer, server.NewServer())
log.Printf("started server: localhost:%v", signalPort)
if err := grpcServer.Serve(lis); err != nil {

2
signal/server/signal.go
View File

@ -29,7 +29,7 @@ func NewServer() *Server {
func (s *Server) Send(ctx context.Context, msg *proto.EncryptedMessage) (*proto.EncryptedMessage, error) {
if !s.registry.IsPeerRegistered(msg.Key) {
return nil, fmt.Errorf("unknown peer %s", msg.Key)
return nil, fmt.Errorf("peer %s is not registered", msg.Key)
}
if dstPeer, found := s.registry.Get(msg.RemoteKey); found {