Flask-LDAPConn

Flask-LDAPConn is a Flask extension providing ldap3 (an LDAP V3 pure Python client) connection for accessing LDAP servers.

To abstract access to LDAP data this extension provides a simple ORM model.

Installation

pip install flask-ldapconn

Configuration

Your configuration should be declared within your Flask config. Sample configuration:

import ssl

LDAP_SERVER = 'localhost'
LDAP_PORT = 389
LDAP_BINDDN = 'cn=admin,dc=example,dc=com'
LDAP_SECRET = 'forty-two'
LDAP_CONNECT_TIMEOUT = 10  # Honored when the TCP connection is being established
LDAP_USE_TLS = True  # default
LDAP_REQUIRE_CERT = ssl.CERT_NONE  # default: CERT_REQUIRED
LDAP_TLS_VERSION = ssl.PROTOCOL_TLSv1_2  # default: PROTOCOL_TLSv1
LDAP_CERT_PATH = '/etc/openldap/certs'

If you want to always get any entry attribute value as a list, instead of a string if only one item is in the attribute list, then set:

FORCE_ATTRIBUTE_VALUE_AS_LIST = True

Default is False and will return a string if only one item is in the attribute list.

Setup

Create the LDAP instance in your application.

from flask import Flask
from flask_ldapconn import LDAPConn

app = Flask(__name__)
ldap = LDAPConn(app)

Client sample

from flask import Flask
from flask_ldapconn import LDAPConn
from ldap3 import SUBTREE

app = Flask(__name__)
ldap = LDAPConn(app)

@app.route('/')
def index():
    ldapc = ldap.connection
    basedn = 'ou=people,dc=example,dc=com'
    search_filter = '(objectClass=posixAccount)'
    attributes = ['sn', 'givenName', 'uid', 'mail']
    ldapc.search(basedn, search_filter, SUBTREE,
                 attributes=attributes)
    response = ldapc.response

User model samples

from flask import Flask
from flask_ldapconn import LDAPConn

app = Flask(__name__)
ldap = LDAPConn(app)

class User(ldap.Entry):

    base_dn = 'ou=people,dc=example,dc=com'
    object_classes = ['inetOrgPerson']

    name = ldap.Attribute('cn')
    email = ldap.Attribute('mail')
    userid = ldap.Attribute('uid')
    surname = ldap.Attribute('sn')
    givenname = ldap.Attribute('givenName')

with app.app_context():

    # get a list of entries
    entries = User.query.filter('email: *@example.com').all()
    for entry in entries:
        print u'Name: {}'.format(entry.name)

    # get the first entry
    user = User.query.filter('userid: user1').first()

    # new entry
    new_user = User(
        name='User Three',
        email='user3@example.com',
        userid='user3',
        surname='Three',
        givenname='User'
    )
    new_user.save()

    # modify entry
    mod_user = User.query.filter('userid: user1').first()
    mod_user.name = 'User Number Three'
    mod_user.email.append.('u.three@example.com')
    mod_user.givenname.delete()
    mod_user.save()

    # remove entry
    rm_user = User.query.filter('userid: user1').first()
    rm_user.delete()

    # authenticate user
    auth_user = User.query.filter('userid: user1').first()
    if auth_user:
        if auth_user.authenticate('password1234'):
            print('Authenticated')
        else:
            print('Wrong password')

Authenticate with Client

from flask import Flask
from flask_ldapconn import LDAPConn

app = Flask(__name__)
ldap = LDAPConn(app)

username = 'user1'
password = 'userpass'
attribute = 'uid'
search_filter = ('(active=1)')

with app.app_context():
    retval = ldap.authenticate(username, password, attribute,
                               basedn, search_filter)
    if not retval:
        return 'Invalid credentials.'
    return 'Welcome %s.' % username

Bind as user

To bind as user for the current request instance a new connection from flask.g.ldap_conn:

g.ldap_conn = ldap.connect(userdn, password)
user = User.query.get(userdn)

Unit Test

I use a simple Docker image to run the tests on localhost. The test file test_flask_ldapconn.py tries to handle start and stop of the docker container:

pip install docker-py
docker pull rroemhild/test-openldap
python test_flask_ldapconn.py

Run the docker container manual:

docker run --privileged -d -p 389:389 --name flask_ldapconn rroemhild/test-openldap
DOCKER_RUN=False python test_flask_ldapconn.py

Unit test with your own settings from a file:

LDAP_SETTINGS=my_settings.py python test_flask_ldapconn.py

Contribute

1. Check for open issues or open a fresh issue to start a discussion around a feature idea or a bug.
2. Fork the repository on Github to start making your changes.
3. Write a test which shows that the bug was fixed or that the feature works as expected.
4. Send a pull request and bug the maintainer until it gets merged and published.