.github/workflows/build.yml

@@ -7,85 +7,11 @@ jobs:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
         with:
-          go-version: '^1.22' # The Go version to download (if necessary) and use.
+          go-version: '^1.17' # The Go version to download (if necessary) and use.
       - run: go test -race -coverprofile coverage.txt -coverpkg ./... -covermode atomic ./...
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v1
         with:
-          files: coverage.txt
-          token: ${{ secrets.CODECOV_TOKEN }}
-
-  compat-test:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        encryption-method: [ plain, chacha20-poly1305 ]
-        num-conn: [ 0, 1, 4 ]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version: '^1.22'
-      - name: Build Cloak
-        run: make
-      - name: Create configs
-        run: |
-          mkdir config
-          cat << EOF > config/ckclient.json
-            {
-              "Transport": "direct",
-              "ProxyMethod": "iperf",
-              "EncryptionMethod": "${{ 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
+          file: coverage.txt

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
       - name: Build
         run: |
           export PATH=${PATH}:`go env GOPATH`/bin
@@ -20,31 +20,3 @@ 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

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

README.md

@@ -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. Use `random` to randomize the server name for every connection made.
+match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to.
 
 `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

@@ -1,30 +1,17 @@
 module github.com/cbeuw/Cloak
 
-go 1.21
-
-toolchain go1.22.2
+go 1.14
 
 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/juju/ratelimit v1.0.2
-	github.com/refraction-networking/utls v1.6.6
+	github.com/refraction-networking/utls v1.6.2
 	github.com/sirupsen/logrus v1.9.3
-	github.com/stretchr/testify v1.9.0
-	go.etcd.io/bbolt v1.3.9
-	golang.org/x/crypto v0.22.0
-)
-
-require (
-	github.com/andybalholm/brotli v1.0.6 // indirect
-	github.com/cloudflare/circl v1.3.7 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/klauspost/compress v1.17.4 // indirect
-	github.com/kr/pretty v0.3.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	golang.org/x/net v0.23.0 // indirect
-	golang.org/x/sys v0.19.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
+	github.com/stretchr/testify v1.8.1
+	gitlab.com/yawning/utls.git v0.0.12-1
+	go.etcd.io/bbolt v1.3.8
+	golang.org/x/crypto v0.19.0
+	golang.org/x/net v0.21.0 // indirect
 )

go.sum

@@ -1,56 +1,425 @@
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+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=
+dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
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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
@@ -30,40 +30,6 @@ 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
@@ -123,10 +89,6 @@ 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/websocket.go

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

internal/common/crypto.go

@@ -6,7 +6,6 @@ import (
 	"crypto/rand"
 	"errors"
 	"io"
-	"math/big"
 	"time"
 
 	log "github.com/sirupsen/logrus"
@@ -53,8 +52,8 @@ func CryptoRandRead(buf []byte) {
 	RandRead(rand.Reader, buf)
 }
 
-func backoff(f func() error) {
-	err := f()
+func RandRead(randSource io.Reader, buf []byte) {
+	_, err := randSource.Read(buf)
 	if err == nil {
 		return
 	}
@@ -62,36 +61,12 @@ func backoff(f func() error) {
 		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: %v. Retrying...", err)
-		err = f()
+		log.Errorf("Failed to get random bytes: %v. Retrying...", err)
+		_, err = randSource.Read(buf)
 		if err == nil {
 			return
 		}
 		time.Sleep(waitDur[i])
 	}
-	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
+	log.Fatal("Cannot get random bytes after 10 retries")
 }

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"
@@ -15,14 +15,6 @@ 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
@@ -35,6 +27,8 @@ type Obfuscator struct {
 	payloadCipher cipher.AEAD
 
 	sessionKey [32]byte
+
+	maxOverhead int
 }
 
 // obfuscate adds multiplexing headers, encrypt and add TLS header
@@ -55,34 +49,45 @@ 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 generate random bytes to be used as salsa20 nonce.
+	// we pad the frame payload with random bytes until it reaches Salsa20's nonce size (8 bytes). Then we simply
+	// 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")
 	}
-	tagLen := 0
-	if o.payloadCipher != nil {
-		tagLen = o.payloadCipher.Overhead()
-	} else {
-		tagLen = salsa20NonceSize
+	var extraLen int
+	if o.payloadCipher == nil {
+		extraLen = salsa20NonceSize - payloadLen
+		if extraLen < 0 {
+			// if our payload is already greater than 8 bytes
+			extraLen = 0
+		}
+	} else {
+		extraLen = o.payloadCipher.Overhead()
+		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 + padLen + tagLen
+	usefulLen := frameHeaderLength + payloadLen + extraLen
 	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+padLen]
+	payload := buf[frameHeaderLength : frameHeaderLength+payloadLen]
 	if payloadOffsetInBuf != frameHeaderLength {
 		// if payload is not at the correct location in buffer
 		copy(payload, f.Payload)
@@ -92,15 +97,14 @@ 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(padLen + tagLen)
+	header[13] = byte(extraLen)
 
-	// Random bytes for padding and nonce
-	_, err := rand.Read(buf[frameHeaderLength+payloadLen : usefulLen])
-	if err != nil {
-		return 0, fmt.Errorf("failed to pad random: %w", err)
+	if o.payloadCipher == nil {
+		if extraLen != 0 { // read nonce
+			extra := buf[usefulLen-extraLen : usefulLen]
+			common.CryptoRandRead(extra)
 		}
-
-	if o.payloadCipher != nil {
+	} else {
 		o.payloadCipher.Seal(payload[:0], header[:o.payloadCipher.NonceSize()], payload, nil)
 	}
 
@@ -162,6 +166,7 @@ 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[:])
@@ -172,6 +177,7 @@ 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])
@@ -182,11 +188,13 @@ 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

@@ -85,6 +85,7 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    sessionKey,
+			maxOverhead:   salsa20NonceSize,
 		}
 		runTest(t, o)
 	})
@@ -97,6 +98,7 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -109,6 +111,7 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -119,6 +122,7 @@ func TestObfuscate(t *testing.T) {
 		o := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    sessionKey,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		runTest(t, o)
 	})
@@ -146,6 +150,7 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 
 		b.SetBytes(int64(len(testFrame.Payload)))
@@ -161,6 +166,7 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -172,6 +178,7 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    key,
+			maxOverhead:   salsa20NonceSize,
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -185,6 +192,7 @@ func BenchmarkObfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
@@ -214,6 +222,7 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
@@ -232,6 +241,7 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: payloadCipher,
 			sessionKey:    key,
+			maxOverhead:   payloadCipher.Overhead(),
 		}
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
@@ -246,6 +256,7 @@ func BenchmarkDeobfs(b *testing.B) {
 		obfuscator := Obfuscator{
 			payloadCipher: nil,
 			sessionKey:    key,
+			maxOverhead:   salsa20NonceSize,
 		}
 		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
@@ -260,8 +271,9 @@ func BenchmarkDeobfs(b *testing.B) {
 		payloadCipher, _ := chacha20poly1305.New(key[:])
 
 		obfuscator := Obfuscator{
-			payloadCipher: payloadCipher,
+			payloadCipher: nil,
 			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 - maxExtraLen
+	sesh.maxStreamUnitWrite = sesh.MsgOnWireSizeLimit - frameHeaderLength - sesh.maxOverhead
 	sesh.streamSendBufferSize = sesh.MsgOnWireSizeLimit
 	sesh.connReceiveBufferSize = 20480 // for backwards compatibility
 
@@ -265,7 +265,6 @@ 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

@@ -2,12 +2,13 @@ package multiplex
 
 import (
 	"errors"
-	"github.com/cbeuw/Cloak/internal/common"
-	log "github.com/sirupsen/logrus"
-	"math/rand/v2"
+	"math/rand"
 	"net"
 	"sync"
 	"sync/atomic"
+	"time"
+
+	log "github.com/sirupsen/logrus"
 )
 
 type switchboardStrategy int
@@ -38,14 +39,19 @@ 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: uniformSpread,
+		strategy: strategy,
 		valve:    sesh.Valve,
 		randPool: sync.Pool{New: func() interface{} {
-			var state [32]byte
-			common.CryptoRandRead(state[:])
-			return rand.New(rand.NewChaCha8(state))
+			return rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
 		}},
 	}
 	return sb
@@ -54,8 +60,8 @@ func makeSwitchboard(sesh *Session) *switchboard {
 var errBrokenSwitchboard = errors.New("the switchboard is broken")
 
 func (sb *switchboard) addConn(conn net.Conn) {
-	connId := atomic.AddUint32(&sb.connsCount, 1) - 1
-	sb.conns.Store(connId, conn)
+	atomic.AddUint32(&sb.connsCount, 1)
+	sb.conns.Store(conn, conn)
 	go sb.deplex(conn)
 }
 
@@ -80,9 +86,6 @@ 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()
@@ -107,7 +110,7 @@ func (sb *switchboard) send(data []byte, assignedConn *net.Conn) (n int, err err
 	return n, nil
 }
 
-// returns a random conn. This function can be called concurrently.
+// returns a random connId
 func (sb *switchboard) pickRandConn() (net.Conn, error) {
 	if atomic.LoadUint32(&sb.broken) == 1 {
 		return nil, errBrokenSwitchboard
@@ -119,15 +122,22 @@ 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)
 
-	ret, ok := sb.conns.Load(connId)
-	if !ok {
-		log.Errorf("failed to get conn %d", connId)
-		return nil, errBrokenSwitchboard
+	var c int
+	var ret net.Conn
+	sb.conns.Range(func(_, conn interface{}) bool {
+		if r == c {
+			ret = conn.(net.Conn)
+			return false
 		}
-	return ret.(net.Conn), nil
+		c++
+		return true
+	})
+
+	return ret, nil
 }
 
 // actively triggered by session.Close()
@@ -135,10 +145,10 @@ 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

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math/rand"
 	"net"
 
 	"github.com/cbeuw/Cloak/internal/common"
@@ -45,7 +46,8 @@ 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}
-		cert := make([]byte, possibleCertLengths[common.RandInt(len(possibleCertLengths))])
+		rand.Seed(int64(sessionKey[0]))
+		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 failure")
+var ErrBadDecryption = errors.New("decryption/authentication faliure")
 
 // 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

release.sh

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

renovate.json

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