Uninitialized ASN.1 value in Flask LDAP3 Auth blueprint

[zoidberg]

I'm trying to put together a flask blueprint for LDAP3 auth. I started out with a standard flask app and that works fine but as soon as I turn it into a blueprint, it fails to work as expected.

Here's the debug output when I run the flask app

Output:
DEBUG:root:Validating LDAPLoginForm against LDAP
DEBUG:flask_ldap3_login:Opening connection with bind user 'XXXX@XXXX.COM'
DEBUG:flask_ldap3_login:Successfully bound to LDAP as 'XXXX@XXXX.COM' for search_bind method
DEBUG:flask_ldap3_login:Performing an LDAP Search using filter '(&(objectclass=person)(sAMAccountName=YYYY))', base 'ou=Users,ou=XXXX,dc=XXXX,dc=COM', and scope 'SUBTREE'
DEBUG:flask_ldap3_login:Opening connection with bind user 'CN=YYYY,OU=Admin Users,OU=Users,OU=XXXX,DC=XXXX,DC=COM'
DEBUG:flask_ldap3_login:Directly binding a connection to a server with user:'CN=YYYY,OU=Admin Users,OU=Users,OU=XXXX,DC=XXXX,DC=COM'
DEBUG:flask_ldap3_login:Authentication was successful for user 'YYYY'

And here's the debug output when run as a blueprint

Output:
DEBUG:root:Validating LDAPLoginForm against LDAP
DEBUG:flask_ldap3_login:Opening connection with bind user 'XXXX@XXXX.COM'
DEBUG:flask_ldap3_login:Destroying connection at <0x7f181f9ee2b0>
ERROR:flask_ldap3_login:Uninitialized ASN.1 value ("__len__" attribute looked up)

My __init__.py looks like this:

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from flask import Flask   app = Flask(__name__) app.config.from_object('config')   from app.ldauth.views import auth_blueprint app.register_blueprint(auth_blueprint)

And app/ldauth/views.py looks like this:

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from flask import Flask, Blueprint, url_for from flask_ldap3_login import LDAP3LoginManager from flask_login import LoginManager, login_user, UserMixin, current_user from flask import render_template_string, render_template, redirect from flask_ldap3_login.forms import LDAPLoginForm from app import app   auth_blueprint = Blueprint('ldauth',__name__,template_folder='templates')   login_manager = LoginManager(app)              ldap_manager = LDAP3LoginManager(app)          users = {}   class User(UserMixin):     def __init__(self, dn, username, data):         self.dn = dn         self.username = username         self.data = data       def __repr__(self):         return self.dn       def get_id(self):         return self.dn   @login_manager.user_loader def load_user(id):     if id in users:         return users[id]     return None     @ldap_manager.save_user def save_user(dn, username, data, memberships):     user = User(dn, username, data)     users[dn] = user     return user   @auth_blueprint.route('/login', methods=['GET', 'POST']) def login():     template = """     {{ get_flashed_messages() }}     {{ form.errors }}     <form method="POST">         <label>Username{{ form.username() }}</label>         <label>Password{{ form.password() }}</label>         {{ form.submit() }}         {{ form.hidden_tag() }}     </form>     """       # Instantiate a LDAPLoginForm which has a validator to check if the user     # exists in LDAP.       form = LDAPLoginForm()       if form.validate_on_submit():         # Successfully logged in, We can now access the saved user object         # via form.user.         login_user(form.user)  # Tell flask-login to log them in.           # TODO: Validate next to ensure it is safe!         return redirect(next)  # Send them home       return render_template_string(template,form=form)

Fairly inexperienced with python so maybe I am just doing something fundamentally wrong here. Any suggestions?

[zoidberg]

Turns out this was environment related, created a new virtualenv this morning, deployed the code into that and everything is working as expected.