Merge pull request #312 from cbeuw/renovate/github.com-refraction-networking-utls-1.x

Update utls and increase server first packet buffer size

.github/workflows/build.yml

@@ -7,11 +7,85 @@ jobs:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v5
         with:
-          go-version: '^1.17' # The Go version to download (if necessary) and use.
+          go-version: '^1.24' # The Go version to download (if necessary) and use.
       - run: go test -race -coverprofile coverage.txt -coverpkg ./... -covermode atomic ./...
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v4
         with:
-          file: coverage.txt
+          files: coverage.txt
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  compat-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        encryption-method: [ plain, chacha20-poly1305 ]
+        num-conn: [ 0, 1, 4 ]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '^1.24'
+      - name: Build Cloak
+        run: make
+      - name: Create configs
+        run: |
+          mkdir config
+          cat << EOF > config/ckclient.json
+            {
+              "Transport": "direct",
+              "ProxyMethod": "iperf",
+              "EncryptionMethod": "${{ matrix.encryption-method }}",
+              "UID": "Q4GAXHVgnDLXsdTpw6bmoQ==",
+              "PublicKey": "4dae/bF43FKGq+QbCc5P/E/MPM5qQeGIArjmJEHiZxc=",
+              "ServerName": "cloudflare.com",
+              "BrowserSig": "firefox",
+              "NumConn": ${{ matrix.num-conn }}
+            }
+          EOF
+          cat << EOF > config/ckserver.json
+            {
+              "ProxyBook": {
+                "iperf": [
+                  "tcp",
+                  "127.0.0.1:5201"
+                ]
+              },
+              "BindAddr": [
+                ":8443"
+              ],
+              "BypassUID": [
+                "Q4GAXHVgnDLXsdTpw6bmoQ=="
+              ],
+              "RedirAddr": "cloudflare.com",
+              "PrivateKey": "AAaskZJRPIAbiuaRLHsvZPvE6gzOeSjg+ZRg1ENau0Y="
+            }
+          EOF
+      - name: Start iperf3 server
+        run: docker run -d --name iperf-server --network host ajoergensen/iperf3:latest --server
+      - name: Test new client against old server
+        run: |
+          docker run -d --name old-cloak-server --network host -v $PWD/config:/go/Cloak/config cbeuw/cloak:latest build/ck-server -c config/ckserver.json --verbosity debug
+          build/ck-client -c config/ckclient.json -s 127.0.0.1 -p 8443 --verbosity debug | tee new-cloak-client.log &
+          docker run --network host ajoergensen/iperf3:latest --client 127.0.0.1 -p 1984
+          docker stop old-cloak-server
+      - name: Test old client against new server
+        run: |
+          build/ck-server -c config/ckserver.json --verbosity debug | tee new-cloak-server.log &
+          docker run -d --name old-cloak-client --network host -v $PWD/config:/go/Cloak/config cbeuw/cloak:latest build/ck-client -c config/ckclient.json -s 127.0.0.1 -p 8443 --verbosity debug
+          docker run --network host ajoergensen/iperf3:latest --client 127.0.0.1 -p 1984
+          docker stop old-cloak-client
+      - name: Dump docker logs
+        if: always()
+        run: |
+          docker container logs iperf-server > iperf-server.log
+          docker container logs old-cloak-server > old-cloak-server.log
+          docker container logs old-cloak-client > old-cloak-client.log
+      - name: Upload logs
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.encryption-method }}-${{ matrix.num-conn }}-conn-logs
+          path: ./*.log

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build
         run: |
           export PATH=${PATH}:`go env GOPATH`/bin
@@ -20,3 +20,31 @@ jobs:
           files: release/*
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            cbeuw/cloak
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,5 @@
+FROM golang:latest
+
+RUN git clone https://github.com/cbeuw/Cloak.git
+WORKDIR Cloak
+RUN make

README.md

@@ -12,7 +12,7 @@
   <img src="https://user-images.githubusercontent.com/7034308/155629720-54dd8758-ec98-4fed-b603-623f0ad83b6c.svg" />
 </p>
 
-Cloak is a [pluggable transport](https://www.ietf.org/proceedings/103/slides/slides-103-pearg-pt-slides-01) that enhances
+Cloak is a [pluggable transport](https://datatracker.ietf.org/meeting/103/materials/slides-103-pearg-pt-slides-01) that enhances
 traditional proxy tools like OpenVPN to evade [sophisticated censorship](https://en.wikipedia.org/wiki/Deep_packet_inspection) and [data discrimination](https://en.wikipedia.org/wiki/Net_bias).
 
 Cloak is not a standalone proxy program. Rather, it works by masquerading proxied traffic as normal web browsing
@@ -137,7 +137,7 @@ random-like. **You may only leave it as `plain` if you are certain that your und
 encryption and authentication (via AEAD or similar techniques).**
 
 `ServerName` is the domain you want to make your ISP or firewall _think_ you are visiting. Ideally it should
-match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to.
+match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to. Use `random` to randomize the server name for every connection made.
 
 `AlternativeNames` is an array used alongside `ServerName` to shuffle between different ServerNames for every new
 connection. **This may conflict with `CDN` Transport mode** if the CDN provider prohibits domain fronting and rejects

go.mod

@@ -1,17 +1,30 @@
 module github.com/cbeuw/Cloak
 
-go 1.14
+go 1.24.0
+
+toolchain go1.24.2
 
 require (
 	github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3
 	github.com/gorilla/mux v1.8.1
-	github.com/gorilla/websocket v1.5.1
+	github.com/gorilla/websocket v1.5.3
 	github.com/juju/ratelimit v1.0.2
-	github.com/refraction-networking/utls v1.6.2
+	github.com/refraction-networking/utls v1.8.0
 	github.com/sirupsen/logrus v1.9.3
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.10.0
-	gitlab.com/yawning/utls.git v0.0.12-1
+	go.etcd.io/bbolt v1.4.0
-	go.etcd.io/bbolt v1.3.8
+	golang.org/x/crypto v0.37.0
-	golang.org/x/crypto v0.19.0
+)
-	golang.org/x/net v0.21.0 // indirect
+
+require (
+	github.com/andybalholm/brotli v1.1.1 // indirect
+	github.com/cloudflare/circl v1.6.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,425 +1,61 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=
-cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/andybalholm/brotli v1.1.1/go.mod h1:05ib4cKhjx3OQYUY22hTVd34Bc8upXjOLL2rKwwZBoA=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
-dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
-dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
-dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
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 github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3/go.mod h1:6jR2SzckGv8hIIS9zWJ160mzGVVOYp4AXZMDtacL6LE=
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-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

internal/client/TLS.go

@@ -1,11 +1,11 @@
 package client
 
 import (
+	"github.com/cbeuw/Cloak/internal/common"
 	utls "github.com/refraction-networking/utls"
 	log "github.com/sirupsen/logrus"
 	"net"
-
+	"strings"
-	"github.com/cbeuw/Cloak/internal/common"
 )
 
 const appDataMaxLength = 16401
@@ -30,6 +30,40 @@ type DirectTLS struct {
 	browser browser
 }
 
+var topLevelDomains = []string{"com", "net", "org", "it", "fr", "me", "ru", "cn", "es", "tr", "top", "xyz", "info"}
+
+func randomServerName() string {
+	/*
+		Copyright: Proton AG
+		https://github.com/ProtonVPN/wireguard-go/commit/bcf344b39b213c1f32147851af0d2a8da9266883
+
+		Permission is hereby granted, free of charge, to any person obtaining a copy of
+		this software and associated documentation files (the "Software"), to deal in
+		the Software without restriction, including without limitation the rights to
+		use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+		of the Software, and to permit persons to whom the Software is furnished to do
+		so, subject to the following conditions:
+
+		The above copyright notice and this permission notice shall be included in all
+		copies or substantial portions of the Software.
+
+		THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+		IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+		FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+		AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+		LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+		OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+		SOFTWARE.
+	*/
+	charNum := int('z') - int('a') + 1
+	size := 3 + common.RandInt(10)
+	name := make([]byte, size)
+	for i := range name {
+		name[i] = byte(int('a') + common.RandInt(charNum))
+	}
+	return string(name) + "." + common.RandItem(topLevelDomains)
+}
+
 func buildClientHello(browser browser, fields clientHelloFields) ([]byte, error) {
 	// We don't use utls to handle connections (as it'll attempt a real TLS negotiation)
 	// We only want it to build the ClientHello locally
@@ -89,6 +123,10 @@ func (tls *DirectTLS) Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey
 		serverName:     authInfo.MockDomain,
 	}
 
+	if strings.EqualFold(fields.serverName, "random") {
+		fields.serverName = randomServerName()
+	}
+
 	var ch []byte
 	ch, err = buildClientHello(tls.browser, fields)
 	if err != nil {

internal/client/connector.go

@@ -21,8 +21,10 @@ func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.D
 	var wg sync.WaitGroup
 	for i := 0; i < connConfig.NumConn; i++ {
 		wg.Add(1)
+		transportConfig := connConfig.Transport
 		go func() {
 		makeconn:
+			transportConn := transportConfig.CreateTransport()
 			remoteConn, err := dialer.Dial("tcp", connConfig.RemoteAddr)
 			if err != nil {
 				log.Errorf("Failed to establish new connections to remote: %v", err)
@@ -31,12 +33,20 @@ func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.D
 				goto makeconn
 			}
 
-			transportConn := connConfig.TransportMaker()
 			sk, err := transportConn.Handshake(remoteConn, authInfo)
 			if err != nil {
 				log.Errorf("Failed to prepare connection to remote: %v", err)
 				transportConn.Close()
+
+				// In Cloak v2.11.0, we've updated uTLS version and subsequently increased the first packet size for chrome above 1500
+				// https://github.com/cbeuw/Cloak/pull/306#issuecomment-2862728738. As a backwards compatibility feature, if we fail
+				// to connect using chrome signature, retry with firefox which has a smaller packet size.
+				if transportConfig.mode == "direct" && transportConfig.browser == chrome {
+					transportConfig.browser = firefox
+					log.Warnf("failed to connect with chrome signature, falling back to retry with firefox")
+				}
 				time.Sleep(time.Second * 3)
+
 				goto makeconn
 			}
 			// sessionKey given by each connection should be identical

internal/client/state.go

@@ -43,11 +43,11 @@ type RawConfig struct {
 }
 
 type RemoteConnConfig struct {
-	Singleplex     bool
+	Singleplex bool
-	NumConn        int
+	NumConn    int
-	KeepAlive      time.Duration
+	KeepAlive  time.Duration
-	RemoteAddr     string
+	RemoteAddr string
-	TransportMaker func() Transport
+	Transport  TransportConfig
 }
 
 type LocalConnConfig struct {
@@ -230,10 +230,9 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 			raw.CDNWsUrlPath = "/"
 		}
 
-		remote.TransportMaker = func() Transport {
+		remote.Transport = TransportConfig{
-			return &WSOverTLS{
+			mode:  "cdn",
-				wsUrl: "ws://" + cdnDomainPort + raw.CDNWsUrlPath,
+			wsUrl: "ws://" + cdnDomainPort + raw.CDNWsUrlPath,
-			}
 		}
 	case "direct":
 		fallthrough
@@ -249,10 +248,9 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 		default:
 			browser = chrome
 		}
-		remote.TransportMaker = func() Transport {
+		remote.Transport = TransportConfig{
-			return &DirectTLS{
+			mode:    "direct",
-				browser: browser,
+			browser: browser,
-			}
 		}
 	}
 

internal/client/transport.go

@@ -8,3 +8,26 @@ type Transport interface {
 	Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey [32]byte, err error)
 	net.Conn
 }
+
+type TransportConfig struct {
+	mode string
+
+	wsUrl string
+
+	browser browser
+}
+
+func (t TransportConfig) CreateTransport() Transport {
+	switch t.mode {
+	case "cdn":
+		return &WSOverTLS{
+			wsUrl: t.wsUrl,
+		}
+	case "direct":
+		return &DirectTLS{
+			browser: t.browser,
+		}
+	default:
+		return nil
+	}
+}

internal/client/websocket.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/cbeuw/Cloak/internal/common"
 	"github.com/gorilla/websocket"
-	utls "gitlab.com/yawning/utls.git"
+	utls "github.com/refraction-networking/utls"
 )
 
 type WSOverTLS struct {

internal/common/crypto.go

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"errors"
 	"io"
+	"math/big"
 	"time"
 
 	log "github.com/sirupsen/logrus"
@@ -52,8 +53,8 @@ func CryptoRandRead(buf []byte) {
 	RandRead(rand.Reader, buf)
 }
 
-func RandRead(randSource io.Reader, buf []byte) {
+func backoff(f func() error) {
-	_, err := randSource.Read(buf)
+	err := f()
 	if err == nil {
 		return
 	}
@@ -61,12 +62,36 @@ func RandRead(randSource io.Reader, buf []byte) {
 		100 * time.Millisecond, 300 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second,
 		3 * time.Second, 5 * time.Second}
 	for i := 0; i < 10; i++ {
-		log.Errorf("Failed to get random bytes: %v. Retrying...", err)
+		log.Errorf("Failed to get random: %v. Retrying...", err)
-		_, err = randSource.Read(buf)
+		err = f()
 		if err == nil {
 			return
 		}
 		time.Sleep(waitDur[i])
 	}
-	log.Fatal("Cannot get random bytes after 10 retries")
+	log.Fatal("Cannot get random after 10 retries")
+}
+
+func RandRead(randSource io.Reader, buf []byte) {
+	backoff(func() error {
+		_, err := randSource.Read(buf)
+		return err
+	})
+}
+
+func RandItem[T any](list []T) T {
+	return list[RandInt(len(list))]
+}
+
+func RandInt(n int) int {
+	s := new(int)
+	backoff(func() error {
+		size, err := rand.Int(rand.Reader, big.NewInt(int64(n)))
+		if err != nil {
+			return err
+		}
+		*s = int(size.Int64())
+		return nil
+	})
+	return *s
 }

internal/multiplex/obfs.go

@@ -3,10 +3,10 @@ package multiplex
 import (
 	"crypto/aes"
 	"crypto/cipher"
+	"crypto/rand"
 	"encoding/binary"
 	"errors"
 	"fmt"
-
 	"github.com/cbeuw/Cloak/internal/common"
 	"golang.org/x/crypto/chacha20poly1305"
 	"golang.org/x/crypto/salsa20"
@@ -15,6 +15,14 @@ import (
 const frameHeaderLength = 14
 const salsa20NonceSize = 8
 
+// maxExtraLen equals the max length of padding + AEAD tag.
+// It is 255 bytes because the extra len field in frame header is only one byte.
+const maxExtraLen = 1<<8 - 1
+
+// padFirstNFrames specifies the number of initial frames to pad,
+// to avoid TLS-in-TLS detection
+const padFirstNFrames = 5
+
 const (
 	EncryptionMethodPlain = iota
 	EncryptionMethodAES256GCM
@@ -27,8 +35,6 @@ type Obfuscator struct {
 	payloadCipher cipher.AEAD
 
 	sessionKey [32]byte
-
-	maxOverhead int
 }
 
 // obfuscate adds multiplexing headers, encrypt and add TLS header
@@ -49,45 +55,34 @@ func (o *Obfuscator) obfuscate(f *Frame, buf []byte, payloadOffsetInBuf int) (in
 	// to be large enough that they may never happen in reasonable time frames. Of course, different sessions
 	// will produce the same combination of stream id and frame sequence, but they will have different session keys.
 	//
-	// Salsa20 is assumed to be given a unique nonce each time because we assume the tags produced by payloadCipher
-	// AEAD is unique each time, as payloadCipher itself is given a unique iv/nonce each time due to points made above.
-	// This is relatively a weak guarantee as we are assuming AEADs to produce different tags given different iv/nonces.
-	// This is almost certainly true but I cannot find a source that outright states this.
 	//
 	// Because the frame header, before it being encrypted, is fed into the AEAD, it is also authenticated.
 	// (rfc5116 s.2.1 "The nonce is authenticated internally to the algorithm").
 	//
 	// In case the user chooses to not encrypt the frame payload, payloadCipher will be nil. In this scenario,
-	// we pad the frame payload with random bytes until it reaches Salsa20's nonce size (8 bytes). Then we simply
+	// we generate random bytes to be used as salsa20 nonce.
-	// encrypt the frame header with the last 8 bytes of frame payload as nonce.
-	// If the payload provided by the user is greater than 8 bytes, then we use entirely the user input as nonce.
-	// We can't ensure its uniqueness ourselves, which is why plaintext mode must only be used when the user input
-	// is already random-like. For Cloak it would normally mean that the user is using a proxy protocol that sends
-	// encrypted data.
 	payloadLen := len(f.Payload)
 	if payloadLen == 0 {
 		return 0, errors.New("payload cannot be empty")
 	}
-	var extraLen int
+	tagLen := 0
-	if o.payloadCipher == nil {
+	if o.payloadCipher != nil {
-		extraLen = salsa20NonceSize - payloadLen
+		tagLen = o.payloadCipher.Overhead()
-		if extraLen < 0 {
-			// if our payload is already greater than 8 bytes
-			extraLen = 0
-		}
 	} else {
-		extraLen = o.payloadCipher.Overhead()
+		tagLen = salsa20NonceSize
-		if extraLen < salsa20NonceSize {
+	}
-			return 0, errors.New("AEAD's Overhead cannot be fewer than 8 bytes")
+	// Pad to avoid size side channel leak
-		}
+	padLen := 0
+	if f.Seq < padFirstNFrames {
+		padLen = common.RandInt(maxExtraLen - tagLen + 1)
 	}
 
-	usefulLen := frameHeaderLength + payloadLen + extraLen
+	usefulLen := frameHeaderLength + payloadLen + padLen + tagLen
 	if len(buf) < usefulLen {
 		return 0, errors.New("obfs buffer too small")
 	}
 	// we do as much in-place as possible to save allocation
-	payload := buf[frameHeaderLength : frameHeaderLength+payloadLen]
+	payload := buf[frameHeaderLength : frameHeaderLength+payloadLen+padLen]
 	if payloadOffsetInBuf != frameHeaderLength {
 		// if payload is not at the correct location in buffer
 		copy(payload, f.Payload)
@@ -97,14 +92,15 @@ func (o *Obfuscator) obfuscate(f *Frame, buf []byte, payloadOffsetInBuf int) (in
 	binary.BigEndian.PutUint32(header[0:4], f.StreamID)
 	binary.BigEndian.PutUint64(header[4:12], f.Seq)
 	header[12] = f.Closing
-	header[13] = byte(extraLen)
+	header[13] = byte(padLen + tagLen)
 
-	if o.payloadCipher == nil {
+	// Random bytes for padding and nonce
-		if extraLen != 0 { // read nonce
+	_, err := rand.Read(buf[frameHeaderLength+payloadLen : usefulLen])
-			extra := buf[usefulLen-extraLen : usefulLen]
+	if err != nil {
-			common.CryptoRandRead(extra)
+		return 0, fmt.Errorf("failed to pad random: %w", err)
-		}
+	}
-	} else {
+
+	if o.payloadCipher != nil {
 		o.payloadCipher.Seal(payload[:0], header[:o.payloadCipher.NonceSize()], payload, nil)
 	}
 
@@ -166,7 +162,6 @@ func MakeObfuscator(encryptionMethod byte, sessionKey [32]byte) (o Obfuscator, e
 	switch encryptionMethod {
 	case EncryptionMethodPlain:
 		o.payloadCipher = nil
-		o.maxOverhead = salsa20NonceSize
 	case EncryptionMethodAES256GCM:
 		var c cipher.Block
 		c, err = aes.NewCipher(sessionKey[:])
@@ -177,7 +172,6 @@ func MakeObfuscator(encryptionMethod byte, sessionKey [32]byte) (o Obfuscator, e
 		if err != nil {
 			return
 		}
-		o.maxOverhead = o.payloadCipher.Overhead()
 	case EncryptionMethodAES128GCM:
 		var c cipher.Block
 		c, err = aes.NewCipher(sessionKey[:16])
@@ -188,13 +182,11 @@ func MakeObfuscator(encryptionMethod byte, sessionKey [32]byte) (o Obfuscator, e
 		if err != nil {
 			return
 		}
-		o.maxOverhead = o.payloadCipher.Overhead()
 	case EncryptionMethodChaha20Poly1305:
 		o.payloadCipher, err = chacha20poly1305.New(sessionKey[:])
 		if err != nil {
 			return
 		}
-		o.maxOverhead = o.payloadCipher.Overhead()
 	default:
 		return o, fmt.Errorf("unknown encryption method valued %v", encryptionMethod)
 	}

internal/multiplex/obfs_test.go

@@ -85,7 +85,6 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    sessionKey,
-			maxOverhead:   salsa20NonceSize,
 		}
 		runTest(t, o)
 	})
@@ -98,7 +97,6 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -111,7 +109,6 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -122,7 +119,6 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -150,7 +146,6 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 
 		b.SetBytes(int64(len(testFrame.Payload)))
@@ -166,7 +161,6 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -178,7 +172,6 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    key,
-			maxOverhead:   salsa20NonceSize,
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -192,7 +185,6 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -222,7 +214,6 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
@@ -241,7 +232,6 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
@@ -256,7 +246,6 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    key,
-			maxOverhead:   salsa20NonceSize,
 		}
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
@@ -271,9 +260,8 @@ func BenchmarkDeobfs(b *testing.B) {
 		payloadCipher, _ := chacha20poly1305.New(key[:])
 
 		obfuscator := Obfuscator{
-			payloadCipher: nil,
+			payloadCipher: payloadCipher,
 			sessionKey:    key,
-			maxOverhead:   payloadCipher.Overhead(),
 		}
 
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)

internal/multiplex/session.go

@@ -108,7 +108,7 @@ func MakeSession(id uint32, config SessionConfig) *Session {
 		sesh.InactivityTimeout = defaultInactivityTimeout
 	}
 
-	sesh.maxStreamUnitWrite = sesh.MsgOnWireSizeLimit - frameHeaderLength - sesh.maxOverhead
+	sesh.maxStreamUnitWrite = sesh.MsgOnWireSizeLimit - frameHeaderLength - maxExtraLen
 	sesh.streamSendBufferSize = sesh.MsgOnWireSizeLimit
 	sesh.connReceiveBufferSize = 20480 // for backwards compatibility
 
@@ -265,6 +265,7 @@ func (sesh *Session) recvDataFromRemote(data []byte) error {
 }
 
 func (sesh *Session) SetTerminalMsg(msg string) {
+	log.Debug("terminal message set to " + msg)
 	sesh.terminalMsgSetter.Do(func() {
 		sesh.terminalMsg = msg
 	})

internal/multiplex/switchboard.go

@@ -2,13 +2,12 @@ package multiplex
 
 import (
 	"errors"
-	"math/rand"
+	"github.com/cbeuw/Cloak/internal/common"
+	log "github.com/sirupsen/logrus"
+	"math/rand/v2"
 	"net"
 	"sync"
 	"sync/atomic"
-	"time"
-
-	log "github.com/sirupsen/logrus"
 )
 
 type switchboardStrategy int
@@ -39,19 +38,14 @@ type switchboard struct {
 }
 
 func makeSwitchboard(sesh *Session) *switchboard {
-	var strategy switchboardStrategy
-	if sesh.Unordered {
-		log.Debug("Connection is unordered")
-		strategy = uniformSpread
-	} else {
-		strategy = fixedConnMapping
-	}
 	sb := &switchboard{
 		session:  sesh,
-		strategy: strategy,
+		strategy: uniformSpread,
 		valve:    sesh.Valve,
 		randPool: sync.Pool{New: func() interface{} {
-			return rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
+			var state [32]byte
+			common.CryptoRandRead(state[:])
+			return rand.New(rand.NewChaCha8(state))
 		}},
 	}
 	return sb
@@ -60,8 +54,8 @@ func makeSwitchboard(sesh *Session) *switchboard {
 var errBrokenSwitchboard = errors.New("the switchboard is broken")
 
 func (sb *switchboard) addConn(conn net.Conn) {
-	atomic.AddUint32(&sb.connsCount, 1)
+	connId := atomic.AddUint32(&sb.connsCount, 1) - 1
-	sb.conns.Store(conn, conn)
+	sb.conns.Store(connId, conn)
 	go sb.deplex(conn)
 }
 
@@ -86,6 +80,9 @@ func (sb *switchboard) send(data []byte, assignedConn *net.Conn) (n int, err err
 			return n, err
 		}
 	case fixedConnMapping:
+		// FIXME: this strategy has a tendency to cause a TLS conn socket buffer to fill up,
+		// which is a problem when multiple streams are mapped to the same conn, resulting
+		// in all such streams being blocked.
 		conn = *assignedConn
 		if conn == nil {
 			conn, err = sb.pickRandConn()
@@ -110,7 +107,7 @@ func (sb *switchboard) send(data []byte, assignedConn *net.Conn) (n int, err err
 	return n, nil
 }
 
-// returns a random connId
+// returns a random conn. This function can be called concurrently.
 func (sb *switchboard) pickRandConn() (net.Conn, error) {
 	if atomic.LoadUint32(&sb.broken) == 1 {
 		return nil, errBrokenSwitchboard
@@ -122,22 +119,15 @@ func (sb *switchboard) pickRandConn() (net.Conn, error) {
 	}
 
 	randReader := sb.randPool.Get().(*rand.Rand)
-
+	connId := randReader.Uint32N(connsCount)
-	r := randReader.Intn(int(connsCount))
 	sb.randPool.Put(randReader)
 
-	var c int
+	ret, ok := sb.conns.Load(connId)
-	var ret net.Conn
+	if !ok {
-	sb.conns.Range(func(_, conn interface{}) bool {
+		log.Errorf("failed to get conn %d", connId)
-		if r == c {
+		return nil, errBrokenSwitchboard
-			ret = conn.(net.Conn)
+	}
-			return false
+	return ret.(net.Conn), nil
-		}
-		c++
-		return true
-	})
-
-	return ret, nil
 }
 
 // actively triggered by session.Close()
@@ -145,10 +135,10 @@ func (sb *switchboard) closeAll() {
 	if !atomic.CompareAndSwapUint32(&sb.broken, 0, 1) {
 		return
 	}
+	atomic.StoreUint32(&sb.connsCount, 0)
 	sb.conns.Range(func(_, conn interface{}) bool {
 		conn.(net.Conn).Close()
 		sb.conns.Delete(conn)
-		atomic.AddUint32(&sb.connsCount, ^uint32(0))
 		return true
 	})
 }

internal/server/TLS.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"math/rand"
 	"net"
 
 	"github.com/cbeuw/Cloak/internal/common"
@@ -46,8 +45,7 @@ func (TLS) makeResponder(clientHelloSessionId []byte, sharedSecret [32]byte) Res
 		// the cert length needs to be the same for all handshakes belonging to the same session
 		// we can use sessionKey as a seed here to ensure consistency
 		possibleCertLengths := []int{42, 27, 68, 59, 36, 44, 46}
-		rand.Seed(int64(sessionKey[0]))
+		cert := make([]byte, possibleCertLengths[common.RandInt(len(possibleCertLengths))])
-		cert := make([]byte, possibleCertLengths[rand.Intn(len(possibleCertLengths))])
 		common.RandRead(randSource, cert)
 
 		var nonce [12]byte

internal/server/auth.go

@@ -61,7 +61,7 @@ func decryptClientInfo(fragments authFragments, serverTime time.Time) (info Clie
 
 var ErrReplay = errors.New("duplicate random")
 var ErrBadProxyMethod = errors.New("invalid proxy method")
-var ErrBadDecryption = errors.New("decryption/authentication faliure")
+var ErrBadDecryption = errors.New("decryption/authentication failure")
 
 // AuthFirstPacket checks if the first packet of data is ClientHello or HTTP GET, and checks if it was from a Cloak client
 // if it is from a Cloak client, it returns the ClientInfo with the decrypted fields. It doesn't check if the user

internal/server/dispatcher.go

@@ -20,6 +20,8 @@ import (
 
 var b64 = base64.StdEncoding.EncodeToString
 
+const firstPacketSize = 3000
+
 func Serve(l net.Listener, sta *State) {
 	waitDur := [10]time.Duration{
 		50 * time.Millisecond, 100 * time.Millisecond, 300 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second,
@@ -124,7 +126,7 @@ func readFirstPacket(conn net.Conn, buf []byte, timeout time.Duration) (int, Tra
 
 func dispatchConnection(conn net.Conn, sta *State) {
 	var err error
-	buf := make([]byte, 1500)
+	buf := make([]byte, firstPacketSize)
 
 	i, transport, redirOnErr, err := readFirstPacket(conn, buf, 15*time.Second)
 	data := buf[:i]

internal/server/state_test.go

@@ -43,13 +43,22 @@ func TestParseRedirAddr(t *testing.T) {
 			t.Errorf("parsing %v error: %v", domainNoPort, err)
 			return
 		}
-		expHost, err := net.ResolveIPAddr("ip", "example.com")
+
+		expIPs, err := net.LookupIP("example.com")
 		if err != nil {
 			t.Errorf("tester error: cannot resolve example.com: %v", err)
 			return
 		}
-		if host.String() != expHost.String() {
+
-			t.Errorf("expected %v got %v", expHost.String(), host.String())
+		contain := false
+		for _, expIP := range expIPs {
+			if expIP.String() == host.String() {
+				contain = true
+			}
+		}
+
+		if !contain {
+			t.Errorf("expected one of %v got %v", expIPs, host.String())
 		}
 		if port != "" {
 			t.Errorf("port not empty when there is no port")
@@ -63,13 +72,22 @@ func TestParseRedirAddr(t *testing.T) {
 			t.Errorf("parsing %v error: %v", domainWPort, err)
 			return
 		}
-		expHost, err := net.ResolveIPAddr("ip", "example.com")
+
+		expIPs, err := net.LookupIP("example.com")
 		if err != nil {
 			t.Errorf("tester error: cannot resolve example.com: %v", err)
 			return
 		}
-		if host.String() != expHost.String() {
+
-			t.Errorf("expected %v got %v", expHost.String(), host.String())
+		contain := false
+		for _, expIP := range expIPs {
+			if expIP.String() == host.String() {
+				contain = true
+			}
+		}
+
+		if !contain {
+			t.Errorf("expected one of %v got %v", expIPs, host.String())
 		}
 		if port != "80" {
 			t.Errorf("wrong port: expected %v, got %v", "80", port)

release.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -eu
+
 go install github.com/mitchellh/gox@latest
 
 mkdir -p release
@@ -18,7 +20,7 @@ echo "Compiling:"
 
 os="windows linux darwin"
 arch="amd64 386 arm arm64 mips mips64 mipsle mips64le"
-pushd cmd/ck-client || exit 1
+pushd cmd/ck-client
 CGO_ENABLED=0 gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
 CGO_ENABLED=0 GOOS="linux" GOARCH="mips" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mips_softfloat-"${v}"
 CGO_ENABLED=0 GOOS="linux" GOARCH="mipsle" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mipsle_softfloat-"${v}"
@@ -27,7 +29,7 @@ popd
 
 os="linux"
 arch="amd64 386 arm arm64"
-pushd cmd/ck-server || exit 1
+pushd cmd/ck-server
 CGO_ENABLED=0 gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
 mv ck-server-* ../../release
 popd

renovate.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "packageRules": [
+    {
+      "packagePatterns": ["*"],
+      "excludePackagePatterns": ["utls"],
+      "enabled": false
+    }
+  ]
+}