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114 lines
2.7 KiB
114 lines
2.7 KiB
package shadowsocks
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import (
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"crypto/cipher"
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"strings"
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"sync"
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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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// Considering email's usage here, map + sync.Mutex/RWMutex may have better performance.
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email sync.Map
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users sync.Map
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}
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// Add a Shadowsocks user, Email must be empty or unique.
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func (v *Validator) Add(u *protocol.MemoryUser) error {
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account := u.Account.(*MemoryAccount)
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if !account.Cipher.IsAEAD() && v.Count() > 0 {
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return newError("The cipher do not support Single-port Multi-user")
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}
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if u.Email != "" {
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_, loaded := v.email.LoadOrStore(strings.ToLower(u.Email), u)
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if loaded {
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return newError("User ", u.Email, " already exists.")
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}
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}
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v.users.Store(string(account.Key)+"&"+account.GetCipherName(), u)
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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(e string) error {
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if e == "" {
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return newError("Email must not be empty.")
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}
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le := strings.ToLower(e)
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u, _ := v.email.Load(le)
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if u == nil {
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return newError("User ", e, " not found.")
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}
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account := u.(*protocol.MemoryUser).Account.(*MemoryAccount)
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v.email.Delete(le)
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v.users.Delete(string(account.Key) + "&" + account.GetCipherName())
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return nil
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}
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// Count the number of Shadowsocks users
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func (v *Validator) Count() int {
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length := 0
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v.users.Range(func(_, _ interface{}) bool {
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length++
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return true
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})
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return length
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}
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// Get a Shadowsocks user and the user's cipher.
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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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var dataSize int
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switch command {
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case protocol.RequestCommandTCP:
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dataSize = 16
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case protocol.RequestCommandUDP:
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dataSize = 8192
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}
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var aeadCipher *AEADCipher
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subkey := make([]byte, 32)
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data := make([]byte, dataSize)
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v.users.Range(func(key, user interface{}) bool {
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account := user.(*protocol.MemoryUser).Account.(*MemoryAccount)
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aeadCipher = account.Cipher.(*AEADCipher)
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ivLen = aeadCipher.IVSize()
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subkey = subkey[:aeadCipher.KeyBytes]
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hkdfSHA1(account.Key, bs[:ivLen], subkey)
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aead = aeadCipher.AEADAuthCreator(subkey)
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switch command {
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case protocol.RequestCommandTCP:
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ret, err = aead.Open(data[:0], data[4:16], bs[ivLen:ivLen+18], nil)
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case protocol.RequestCommandUDP:
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ret, err = aead.Open(data[:0], data[8180:8192], bs[ivLen:], nil)
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}
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if err == nil {
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u = user.(*protocol.MemoryUser)
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return false
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}
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return true
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})
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return
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}
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// Get the only user without authentication
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func (v *Validator) GetOnlyUser() (u *protocol.MemoryUser, ivLen int32) {
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v.users.Range(func(_, user interface{}) bool {
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u = user.(*protocol.MemoryUser)
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return false
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})
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ivLen = u.Account.(*MemoryAccount).Cipher.IVSize()
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return
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}
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