feat: support user migration from Keycloak using syncer (#645)

* feat: support user migration from Keycloak using syncer

Signed-off-by: Yixiang Zhao <seriouszyx@foxmail.com>

* feat: add more Keycloak columns

Signed-off-by: Yixiang Zhao <seriouszyx@foxmail.com>

* fix: requested changes

Signed-off-by: Yixiang Zhao <seriouszyx@foxmail.com>

cred/manager.go

@@ -28,6 +28,8 @@ func GetCredManager(passwordType string) CredManager {
 		return NewMd5UserSaltCredManager()
 	} else if passwordType == "bcrypt" {
 		return NewBcryptCredManager()
+	} else if passwordType == "pbkdf2-salt" {
+		return NewPbkdf2SaltCredManager()
 	}
 	return nil
 }

cred/pbkdf2-salt.go

@@ -0,0 +1,39 @@
+// Copyright 2022 The Casdoor Authors. All Rights Reserved.
+//
+// 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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cred
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"golang.org/x/crypto/pbkdf2"
+)
+
+type Pbkdf2SaltCredManager struct{}
+
+func NewPbkdf2SaltCredManager() *Pbkdf2SaltCredManager {
+	cm := &Pbkdf2SaltCredManager{}
+	return cm
+}
+
+func (cm *Pbkdf2SaltCredManager) GetHashedPassword(password string, userSalt string, organizationSalt string) string {
+	// https://www.keycloak.org/docs/latest/server_admin/index.html#password-database-compromised
+	decodedSalt, _ := base64.StdEncoding.DecodeString(userSalt)
+	res := pbkdf2.Key([]byte(password), decodedSalt, 27500, 64, sha256.New)
+	return base64.StdEncoding.EncodeToString(res)
+}
+
+func (cm *Pbkdf2SaltCredManager) IsPasswordCorrect(plainPwd string, hashedPwd string, userSalt string, organizationSalt string) bool {
+	return hashedPwd == cm.GetHashedPassword(plainPwd, userSalt, organizationSalt)
+}