tidb mysql_native_password 源码
tidb mysql_native_password 代码
文件路径：/parser/auth/mysql_native_password.go
// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package auth
import (
"bytes"
"crypto/sha1" //nolint: gosec
"encoding/hex"
"fmt"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/parser/terror"
)
// CheckScrambledPassword check scrambled password received from client.
// The new authentication is performed in following manner:
//
// SERVER: public_seed=create_random_string()
// send(public_seed)
// CLIENT: recv(public_seed)
// hash_stage1=sha1("password")
// hash_stage2=sha1(hash_stage1)
// reply=xor(hash_stage1, sha1(public_seed,hash_stage2)
// // this three steps are done in scramble()
// send(reply)
// SERVER: recv(reply)
// hash_stage1=xor(reply, sha1(public_seed,hash_stage2))
// candidate_hash2=sha1(hash_stage1)
// check(candidate_hash2==hash_stage2)
// // this three steps are done in check_scramble()
func CheckScrambledPassword(salt, hpwd, auth []byte) bool {
//nolint: gosec
crypt := sha1.New()
_, err := crypt.Write(salt)
terror.Log(errors.Trace(err))
_, err = crypt.Write(hpwd)
terror.Log(errors.Trace(err))
hash := crypt.Sum(nil)
// token = scrambleHash XOR stage1Hash
if len(auth) != len(hash) {
return false
}
for i := range hash {
hash[i] ^= auth[i]
}
return bytes.Equal(hpwd, Sha1Hash(hash))
}
// Sha1Hash is an util function to calculate sha1 hash.
func Sha1Hash(bs []byte) []byte {
//nolint: gosec
crypt := sha1.New()
_, err := crypt.Write(bs)
terror.Log(errors.Trace(err))
return crypt.Sum(nil)
}
// EncodePassword converts plaintext password(type is string) to hashed hex string.
func EncodePassword(pwd string) string {
if len(pwd) == 0 {
return ""
}
hash1 := Sha1Hash([]byte(pwd))
hash2 := Sha1Hash(hash1)
return fmt.Sprintf("*%X", hash2)
}
// EncodePasswordBytes converts plaintext password(type is []byte) to hashed hex string.
func EncodePasswordBytes(pwd []byte) string {
if len(pwd) == 0 {
return ""
}
hash1 := Sha1Hash(pwd)
hash2 := Sha1Hash(hash1)
return fmt.Sprintf("*%X", hash2)
}
// DecodePassword converts hex string password without prefix '*' to byte array.
func DecodePassword(pwd string) ([]byte, error) {
x, err := hex.DecodeString(pwd[1:])
if err != nil {
return nil, errors.Trace(err)
}
return x, nil
}
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