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133 lines
3.0 KiB
133 lines
3.0 KiB
package shadowsocks
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import (
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"crypto/cipher"
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"crypto/hmac"
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"crypto/sha256"
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"hash/crc64"
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"strings"
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"sync"
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"github.com/xtls/xray-core/common/dice"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/protocol"
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)
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// Validator stores valid Shadowsocks users.
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type Validator struct {
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sync.RWMutex
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users []*protocol.MemoryUser
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behaviorSeed uint64
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behaviorFused bool
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}
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var ErrNotFound = errors.New("Not Found")
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// Add a Shadowsocks user.
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func (v *Validator) Add(u *protocol.MemoryUser) error {
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v.Lock()
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defer v.Unlock()
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account := u.Account.(*MemoryAccount)
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if !account.Cipher.IsAEAD() && len(v.users) > 0 {
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return errors.New("The cipher is not support Single-port Multi-user")
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}
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v.users = append(v.users, u)
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if !v.behaviorFused {
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hashkdf := hmac.New(sha256.New, []byte("SSBSKDF"))
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hashkdf.Write(account.Key)
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v.behaviorSeed = crc64.Update(v.behaviorSeed, crc64.MakeTable(crc64.ECMA), hashkdf.Sum(nil))
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}
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return nil
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}
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// Del a Shadowsocks user with a non-empty Email.
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func (v *Validator) Del(email string) error {
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if email == "" {
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return errors.New("Email must not be empty.")
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}
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v.Lock()
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defer v.Unlock()
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email = strings.ToLower(email)
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idx := -1
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for i, u := range v.users {
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if strings.EqualFold(u.Email, email) {
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idx = i
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break
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}
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}
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if idx == -1 {
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return errors.New("User ", email, " not found.")
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}
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ulen := len(v.users)
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v.users[idx] = v.users[ulen-1]
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v.users[ulen-1] = nil
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v.users = v.users[:ulen-1]
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return nil
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}
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// Get a Shadowsocks user.
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func (v *Validator) Get(bs []byte, command protocol.RequestCommand) (u *protocol.MemoryUser, aead cipher.AEAD, ret []byte, ivLen int32, err error) {
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v.RLock()
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defer v.RUnlock()
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for _, user := range v.users {
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if account := user.Account.(*MemoryAccount); account.Cipher.IsAEAD() {
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// AEAD payload decoding requires the payload to be over 32 bytes
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if len(bs) < 32 {
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continue
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}
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aeadCipher := account.Cipher.(*AEADCipher)
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ivLen = aeadCipher.IVSize()
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iv := bs[:ivLen]
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subkey := make([]byte, 32)
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subkey = subkey[:aeadCipher.KeyBytes]
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hkdfSHA1(account.Key, iv, subkey)
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aead = aeadCipher.AEADAuthCreator(subkey)
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var matchErr error
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switch command {
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case protocol.RequestCommandTCP:
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data := make([]byte, 4+aead.NonceSize())
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ret, matchErr = aead.Open(data[:0], data[4:], bs[ivLen:ivLen+18], nil)
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case protocol.RequestCommandUDP:
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data := make([]byte, 8192)
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ret, matchErr = aead.Open(data[:0], data[8192-aead.NonceSize():8192], bs[ivLen:], nil)
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}
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if matchErr == nil {
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u = user
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err = account.CheckIV(iv)
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return
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}
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} else {
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u = user
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ivLen = user.Account.(*MemoryAccount).Cipher.IVSize()
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// err = user.Account.(*MemoryAccount).CheckIV(bs[:ivLen]) // The IV size of None Cipher is 0.
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return
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}
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}
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return nil, nil, nil, 0, ErrNotFound
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}
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func (v *Validator) GetBehaviorSeed() uint64 {
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v.Lock()
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defer v.Unlock()
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v.behaviorFused = true
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if v.behaviorSeed == 0 {
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v.behaviorSeed = dice.RollUint64()
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}
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return v.behaviorSeed
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}
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