mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-14 08:15:55 -05:00
120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
package aead
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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rand3 "crypto/rand"
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"encoding/binary"
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"errors"
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"hash/crc32"
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"io"
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"math"
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"time"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/antireplay"
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)
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var (
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ErrNotFound = errors.New("user do not exist")
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ErrReplay = errors.New("replayed request")
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)
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func CreateAuthID(cmdKey []byte, time int64) [16]byte {
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buf := bytes.NewBuffer(nil)
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common.Must(binary.Write(buf, binary.BigEndian, time))
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var zero uint32
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common.Must2(io.CopyN(buf, rand3.Reader, 4))
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zero = crc32.ChecksumIEEE(buf.Bytes())
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common.Must(binary.Write(buf, binary.BigEndian, zero))
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aesBlock := NewCipherFromKey(cmdKey)
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if buf.Len() != 16 {
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panic("Size unexpected")
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}
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var result [16]byte
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aesBlock.Encrypt(result[:], buf.Bytes())
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return result
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}
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func NewCipherFromKey(cmdKey []byte) cipher.Block {
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aesBlock, err := aes.NewCipher(KDF16(cmdKey, KDFSaltConstAuthIDEncryptionKey))
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if err != nil {
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panic(err)
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}
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return aesBlock
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}
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type AuthIDDecoder struct {
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s cipher.Block
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}
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func NewAuthIDDecoder(cmdKey []byte) *AuthIDDecoder {
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return &AuthIDDecoder{NewCipherFromKey(cmdKey)}
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}
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func (aidd *AuthIDDecoder) Decode(data [16]byte) (int64, uint32, int32, []byte) {
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aidd.s.Decrypt(data[:], data[:])
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var t int64
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var zero uint32
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var rand int32
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reader := bytes.NewReader(data[:])
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common.Must(binary.Read(reader, binary.BigEndian, &t))
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common.Must(binary.Read(reader, binary.BigEndian, &rand))
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common.Must(binary.Read(reader, binary.BigEndian, &zero))
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return t, zero, rand, data[:]
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}
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func NewAuthIDDecoderHolder() *AuthIDDecoderHolder {
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return &AuthIDDecoderHolder{make(map[string]*AuthIDDecoderItem), antireplay.NewReplayFilter(120)}
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}
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type AuthIDDecoderHolder struct {
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decoders map[string]*AuthIDDecoderItem
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filter *antireplay.ReplayFilter
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}
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type AuthIDDecoderItem struct {
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dec *AuthIDDecoder
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ticket interface{}
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}
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func NewAuthIDDecoderItem(key [16]byte, ticket interface{}) *AuthIDDecoderItem {
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return &AuthIDDecoderItem{
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dec: NewAuthIDDecoder(key[:]),
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ticket: ticket,
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}
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}
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func (a *AuthIDDecoderHolder) AddUser(key [16]byte, ticket interface{}) {
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a.decoders[string(key[:])] = NewAuthIDDecoderItem(key, ticket)
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}
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func (a *AuthIDDecoderHolder) RemoveUser(key [16]byte) {
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delete(a.decoders, string(key[:]))
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}
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func (a *AuthIDDecoderHolder) Match(authID [16]byte) (interface{}, error) {
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for _, v := range a.decoders {
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t, z, _, d := v.dec.Decode(authID)
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if z != crc32.ChecksumIEEE(d[:12]) {
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continue
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}
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if t < 0 {
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continue
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}
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if math.Abs(math.Abs(float64(t))-float64(time.Now().Unix())) > 120 {
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continue
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}
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if !a.filter.Check(authID[:]) {
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return nil, ErrReplay
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}
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return v.ticket, nil
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}
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return nil, ErrNotFound
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}
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