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Mainly reverse VLESS Client Hello

Browse Source 
https://github.com/XTLS/Xray-core/pull/4952#issuecomment-3176751311
This commit is contained in:
RPRX
2025-08-12 11:51:28 +00:00
committed by GitHub
parent 7ffb555fc8
commit ec1cc35188
4 changed files with 143 additions and 123 deletions
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122
proxy/vless/encryption/server.go
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@@ -25,10 +25,11 @@ type ServerSession struct {
type ServerInstance struct {
sync.RWMutex
dKeyNfs *mlkem.DecapsulationKey768
xor uint32
minutes time.Duration
sessions map[[21]byte]*ServerSession
nfsDKey *mlkem.DecapsulationKey768
nfsEKeyBytes []byte
xor uint32
minutes time.Duration
sessions map[[21]byte]*ServerSession
}
type ServerConn struct {
@@ -44,9 +45,12 @@ type ServerConn struct {
nonce []byte
}
func (i *ServerInstance) Init(dKeyNfsData []byte, xor uint32, minutes time.Duration) (err error) {
i.dKeyNfs, err = mlkem.NewDecapsulationKey768(dKeyNfsData)
i.xor = xor
func (i *ServerInstance) Init(nfsDKeySeed []byte, xor uint32, minutes time.Duration) (err error) {
i.nfsDKey, err = mlkem.NewDecapsulationKey768(nfsDKeySeed)
if xor > 0 {
i.nfsEKeyBytes = i.nfsDKey.EncapsulationKey().Bytes()
i.xor = xor
}
if minutes > 0 {
i.minutes = minutes
i.sessions = make(map[[21]byte]*ServerSession)
@@ -55,9 +59,9 @@ func (i *ServerInstance) Init(dKeyNfsData []byte, xor uint32, minutes time.Durat
time.Sleep(time.Minute)
now := time.Now()
i.Lock()
for index, session := range i.sessions {
for ticket, session := range i.sessions {
if now.After(session.expire) {
delete(i.sessions, index)
delete(i.sessions, ticket)
}
}
i.Unlock()
@@ -68,11 +72,11 @@ func (i *ServerInstance) Init(dKeyNfsData []byte, xor uint32, minutes time.Durat
}
func (i *ServerInstance) Handshake(conn net.Conn) (net.Conn, error) {
if i.dKeyNfs == nil {
if i.nfsDKey == nil {
return nil, errors.New("uninitialized")
}
if i.xor == 1 {
conn = NewXorConn(conn, i.dKeyNfs.EncapsulationKey().Bytes())
if i.xor > 0 {
conn = NewXorConn(conn, i.nfsEKeyBytes)
}
c := &ServerConn{Conn: conn}
@@ -100,49 +104,50 @@ func (i *ServerInstance) Handshake(conn net.Conn) (net.Conn, error) {
return nil, err
}
if l, _ := decodeHeader(peerHeader); l != 0 {
c.Conn.Write(make([]byte, crypto.RandBetween(100, 1000))) // make client do new handshake
noise := make([]byte, crypto.RandBetween(100, 1000))
rand.Read(noise)
c.Conn.Write(noise) // make client do new handshake
return nil, errors.New("invalid ticket")
}
peerClientHello := make([]byte, 1088+1184+1)
peerClientHello := make([]byte, 1+1184+1088)
copy(peerClientHello, peerTicketHello)
copy(peerClientHello[53:], peerHeader)
if _, err := io.ReadFull(c.Conn, peerClientHello[58:]); err != nil {
return nil, err
}
encapsulatedNfsKey := peerClientHello[:1088]
eKeyPfsData := peerClientHello[1088:2272]
c.cipher = peerClientHello[2272]
if c.cipher != 0 && c.cipher != 1 {
return nil, errors.New("invalid cipher")
}
c.cipher = peerClientHello[0]
pfsEKeyBytes := peerClientHello[1:1185]
encapsulatedNfsKey := peerClientHello[1185:2273]
nfsKey, err := i.dKeyNfs.Decapsulate(encapsulatedNfsKey)
pfsEKey, err := mlkem.NewEncapsulationKey768(pfsEKeyBytes)
if err != nil {
return nil, err
}
eKeyPfs, err := mlkem.NewEncapsulationKey768(eKeyPfsData)
nfsKey, err := i.nfsDKey.Decapsulate(encapsulatedNfsKey)
if err != nil {
return nil, err
}
pfsKey, encapsulatedPfsKey := eKeyPfs.Encapsulate()
c.baseKey = append(nfsKey, pfsKey...)
pfsKey, encapsulatedPfsKey := pfsEKey.Encapsulate()
c.baseKey = append(pfsKey, nfsKey...)
authKey := make([]byte, 32)
hkdf.New(sha256.New, c.baseKey, encapsulatedNfsKey, eKeyPfsData).Read(authKey)
nonce := make([]byte, 12)
c.ticket = newAead(c.cipher, authKey).Seal(nil, nonce, []byte("VLESS"), encapsulatedPfsKey)
hkdf.New(sha256.New, c.baseKey, encapsulatedPfsKey, encapsulatedNfsKey).Read(authKey)
nonce := [12]byte{c.cipher}
c.ticket = newAead(c.cipher, authKey).Seal(nil, nonce[:], []byte("VLESS"), pfsEKeyBytes)
padding := crypto.RandBetween(100, 1000)
paddingLen := crypto.RandBetween(100, 1000)
serverHello := make([]byte, 1088+21+5+padding)
serverHello := make([]byte, 1088+21+5+paddingLen)
copy(serverHello, encapsulatedPfsKey)
copy(serverHello[1088:], c.ticket)
encodeHeader(serverHello[1109:], int(padding))
encodeHeader(serverHello[1109:], int(paddingLen))
rand.Read(serverHello[1114:])
if _, err := c.Conn.Write(serverHello); err != nil {
return nil, err
}
// we can send more padding if needed
if i.minutes > 0 {
i.Lock()
@@ -168,11 +173,11 @@ func (c *ServerConn) Read(b []byte) (int, error) {
if _, err := io.ReadFull(c.Conn, peerHeader); err != nil {
return 0, err
}
peerPadding, _ := decodeHeader(peerHeader)
if peerPadding == 0 {
peerPaddingLen, _ := decodeHeader(peerHeader)
if peerPaddingLen == 0 {
break
}
if _, err := io.ReadFull(c.Conn, make([]byte, peerPadding)); err != nil {
if _, err := io.ReadFull(c.Conn, make([]byte, peerPaddingLen)); err != nil {
return 0, err
}
}
@@ -212,7 +217,7 @@ func (c *ServerConn) Read(b []byte) (int, error) {
}
dst := peerData[:peerLength-16]
if len(dst) <= len(b) {
dst = b[:len(dst)] // max=8192 is recommended for peer
dst = b[:len(dst)] // avoids another copy()
}
_, err = c.peerAead.Open(dst[:0], c.peerNonce, peerData, peerHeader)
increaseNonce(c.peerNonce)
@@ -226,31 +231,38 @@ func (c *ServerConn) Read(b []byte) (int, error) {
return len(dst), nil
}
func (c *ServerConn) Write(b []byte) (int, error) { // after first Read()
func (c *ServerConn) Write(b []byte) (int, error) {
if len(b) == 0 {
return 0, nil
}
var data []byte
if c.aead == nil {
if c.peerRandom == nil {
return 0, errors.New("can not Write() first")
for n := 0; n < len(b); {
b := b[n:]
if len(b) > 8192 {
b = b[:8192] // for avoiding another copy() in client's Read()
}
n += len(b)
var data []byte
if c.aead == nil {
if c.peerRandom == nil {
return 0, errors.New("empty c.peerRandom")
}
data = make([]byte, 32+5+len(b)+16)
rand.Read(data[:32])
key := make([]byte, 32)
hkdf.New(sha256.New, c.baseKey, data[:32], c.peerRandom).Read(key)
c.aead = newAead(c.cipher, key)
c.nonce = make([]byte, 12)
encodeHeader(data[32:], len(b)+16)
c.aead.Seal(data[:37], c.nonce, b, data[32:37])
} else {
data = make([]byte, 5+len(b)+16)
encodeHeader(data, len(b)+16)
c.aead.Seal(data[:5], c.nonce, b, data[:5])
}
increaseNonce(c.nonce)
if _, err := c.Conn.Write(data); err != nil {
return 0, err
}
data = make([]byte, 32+5+len(b)+16)
rand.Read(data[:32])
key := make([]byte, 32)
hkdf.New(sha256.New, c.baseKey, data[:32], c.peerRandom).Read(key)
c.aead = newAead(c.cipher, key)
c.nonce = make([]byte, 12)
encodeHeader(data[32:], len(b)+16)
c.aead.Seal(data[:37], c.nonce, b, data[32:37])
} else {
data = make([]byte, 5+len(b)+16)
encodeHeader(data, len(b)+16)
c.aead.Seal(data[:5], c.nonce, b, data[:5])
}
increaseNonce(c.nonce)
if _, err := c.Conn.Write(data); err != nil {
return 0, err
}
return len(b), nil
}