diff --git a/cmdb-api/Pipfile b/cmdb-api/Pipfile
index 2cc3fb4..b8dbf52 100644
--- a/cmdb-api/Pipfile
+++ b/cmdb-api/Pipfile
@@ -25,6 +25,7 @@ supervisor = "==4.0.3"
 Flask-Login = "==0.4.1"
 Flask-Bcrypt = "==0.7.1"
 Flask-Cors = ">=3.0.8"
+python-ldap = "==3.2.0"
 # Caching
 Flask-Caching = ">=1.0.0"
 # Environment variable parsing
diff --git a/cmdb-api/api/lib/perm/auth.py b/cmdb-api/api/lib/perm/auth.py
index 5020dbf..4257f41 100644
--- a/cmdb-api/api/lib/perm/auth.py
+++ b/cmdb-api/api/lib/perm/auth.py
@@ -13,8 +13,8 @@ from flask import request
 from flask import session
 from flask_login import login_user
 
-from api.models.acl import User
 from api.lib.perm.acl.cache import UserCache
+from api.models.acl import User
 
 
 def _auth_with_key():
diff --git a/cmdb-api/api/models/acl.py b/cmdb-api/api/models/acl.py
index 98eeae5..aec6194 100644
--- a/cmdb-api/api/models/acl.py
+++ b/cmdb-api/api/models/acl.py
@@ -5,6 +5,7 @@ import copy
 import hashlib
 from datetime import datetime
 
+import ldap
 from flask import current_app
 from flask_sqlalchemy import BaseQuery
 
@@ -50,6 +51,32 @@ class UserQuery(BaseQuery):
 
         return user, authenticated
 
+    def authenticate_with_ldap(self, username, password):
+        ldap_conn = ldap.initialize(current_app.config.get('LDAP_SERVER'))
+        ldap_conn.protocol_version = 3
+        ldap_conn.set_option(ldap.OPT_REFERRALS, 0)
+        if '@' in username:
+            who = '{0}@{1}'.format(username.split('@')[0], current_app.config.get('LDAP_DOMAIN'))
+        else:
+            who = '{0}@{1}'.format(username, current_app.config.get('LDAP_DOMAIN'))
+
+        username = username.split('@')[0]
+        user = self.get_by_username(username)
+        try:
+
+            if not password:
+                raise ldap.INVALID_CREDENTIALS
+
+            ldap_conn.simple_bind_s(who, password)
+
+            if not user:
+                from api.lib.perm.acl.user import UserCRUD
+                user = UserCRUD.add(username=username, email=who)
+
+            return user, True
+        except ldap.INVALID_CREDENTIALS:
+            return user, False
+
     def search(self, key):
         query = self.filter(db.or_(User.email == key,
                                    User.nickname.ilike('%' + key + '%'),
diff --git a/cmdb-api/api/views/account.py b/cmdb-api/api/views/account.py
index df7c22a..37ed17b 100644
--- a/cmdb-api/api/views/account.py
+++ b/cmdb-api/api/views/account.py
@@ -26,7 +26,10 @@ class LoginView(APIView):
     def post(self):
         username = request.values.get("username") or request.values.get("email")
         password = request.values.get("password")
-        user, authenticated = User.query.authenticate(username, password)
+        if current_app.config.get('AUTH_WITH_LDAP'):
+            user, authenticated = User.query.authenticate_with_ldap(username, password)
+        else:
+            user, authenticated = User.query.authenticate(username, password)
         if not user:
             return abort(403, "User <{0}> does not exist".format(username))
         if not authenticated:
diff --git a/cmdb-api/requirements.txt b/cmdb-api/requirements.txt
index 476b050..34153b0 100644
--- a/cmdb-api/requirements.txt
+++ b/cmdb-api/requirements.txt
@@ -20,6 +20,7 @@ supervisor == 4.0.3
 Flask-Login == 0.4.1
 Flask-Bcrypt == 0.7.1
 Flask-Cors >= 3.0.8
+python-ldap == 3.2.0
 # Caching
 Flask-Caching >= 1.0.0
 # Environment variable parsing
diff --git a/cmdb-api/settings.py.example b/cmdb-api/settings.py.example
index 593fbbc..b28c568 100644
--- a/cmdb-api/settings.py.example
+++ b/cmdb-api/settings.py.example
@@ -69,6 +69,11 @@ CAS_VALIDATE_ROUTE = "/cas/serviceValidate"
 CAS_AFTER_LOGIN = "/"
 DEFAULT_SERVICE = "http://127.0.0.1:8000"
 
+# # ldap
+AUTH_WITH_LDAP = False
+LDAP_SERVER = ''
+LDAP_DOMAIN = ''
+
 # # pagination
 DEFAULT_PAGE_COUNT = 50