init
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3
README.md
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3
README.md
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# Flask LDAP user management
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Web app for adding,delating and modifying users using LDAP
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5
luser/__init__.py
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5
luser/__init__.py
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from flask import Flask
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app = Flask(__name__)
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from luser import routes
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203
luser/models.py
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203
luser/models.py
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from ldap3 import Server,Connection,ALL,MODIFY_REPLACE
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from datetime import datetime
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class LUSER():
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'''
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Class that represents secure connection to LDAP server
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LDAPhost := string IP or hostname of LDAP server
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admin_user := string DN of LDAP admin user
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admin_pass := string password of LDAP admin user
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base := string base in LDAP system where users are made
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basealt := string base in LDAP system where users are made with password hashes generated for openalt
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'''
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def __init__(self, ldap_host, admin_user, admin_pass, base, basealt=''):
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self.ldap_host = ldap_host
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self.admin_user = admin_user
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self.admin_pass = admin_pass
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self.base = base
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self.basealt = basealt
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self.alt = True
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ldapserver = Server(ldap_host, use_ssl=True)
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self.ldapconnection = Connection(ldapserver, admin_user, admin_pass, auto_bind=True)
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# uid and gid of most recently registered users
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self.lastuid = 1337
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self.lastgid = 1337
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# Set alt boolean to false if basealt not set
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if basealt == '':
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self.alt = False
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def prepareluser(self):
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'''
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Create base on LDAP host
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'''
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# Split base string with commas to find values of organization and dc
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baselist = self.base.split(",")
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basealtlist = self.basealt.split(",")
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# Find ou in base and set it as organization variable
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for i in baselist:
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if i.split('=')[0] == 'ou':
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organization = i.split('=')[1]
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break
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for i in basealtlist:
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if i.split('=')[0] == 'ou':
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organizationalt = i.split('=')[1]
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break
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# Find first dc and set it as dc variable
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for i in baselist:
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if i.split('=')[0] == 'dc':
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dc = i.split('=')[1]
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break
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for i in basealtlist:
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if i.split('=')[0] == 'dc':
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dcalt = i.split('=')[1]
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break
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# Find full dc and set it as dcfull variable
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for i in baselist:
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if i.split('=')[0] == 'dc':
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dcfull += ',dc=' + i.split('=')[1]
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for i in basealtlist:
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if i.split('=')[0] == 'dc':
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dcfullalt += ',dc=' + i.split('=')[1]
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# Remove first column character
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dcfull = dcfull[1:]
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dcfullalt = dcfull[1:]
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# Create organization on LDAP server and store boolean indicating it's success
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rcode1 = self.ldapconnection.add(f'dc={dcfull}', ['dcObject', 'organization'], {'o' : dc, 'dc' : dc})
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if self.alt:
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rcode2 = self.ldapconnection.add(f'dc={dcfullalt}', ['dcObject', 'organization'], {'o' : dcalt, 'dc' : dcalt})
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else:
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rcode2 = True
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# Create organizational units on LDAP server and store boolean indicating it's success
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rcode3 = self.ldapconnection.add(self.base, ['top', 'organizationalUnit'], {'ou' : organization})
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if self.alt :
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rcode4 = self.ldapconnection.add(self.basealt, ['top', 'organizationalUnit'], {'ou' : organizationalt})
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else:
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rcode4 = True
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# Return True only if all return values are true
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return rcode1 and rcode2 and rcode3 and rcode4
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def lastpwchangenow(self):
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'''
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Return time of last password change for the user set to current time
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messured in days from UNIX epoch
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'''
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return str((datetime.utcnow() - datetime(1970,1,1)).days)
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def add(self, user, password, althash=""):
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'''
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Add a user to base in LDAP with user and pass as credentials
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user := string containing username
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password := string containing user password
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althash := string containing user password/hash for the alternative base
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'''
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# Increase UID and GID counters
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self.lastuid += 1
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self.lastgid += 1
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# Add user to base
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id = f"uid={user}"
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# Object classes of a user entry
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objectClass = ['top', 'person', 'organizationalPerson', 'inetOrgPerson', 'posixAccount', 'shadowAccount']
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# Attributes for a user entry
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attributes = {'cn' : user, 'sn' : user, 'givenName' : user, 'uid' : user, 'uidNumber' : self.lastuid, 'gidNumber' : self.lastgid, 'homeDirectory' : f'/home/{user}', 'loginShell' : '/usr/bin/git-shell', 'gecos' : 'SystemUser', 'shadowLastChange' : self.lastpwchangenow(), 'shadowMax' : '45', 'userPassword' : password}
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attributesalt = {'cn' : user, 'sn' : user, 'givenName' : user, 'uid' : user, 'uidNumber' : self.lastuid, 'gidNumber' : self.lastgid, 'homeDirectory' : f'/home/{user}', 'loginShell' : '/usr//bin/git-shell', 'gecos' : 'SystemUser', 'shadowLastChange' : self.lastpwchangenow(), 'shadowMax' : '45', 'userPassword' : althash}
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# Return boolean value of new user entry
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rcode1 = self.ldapconnection.add(f'{id},{self.base}', objectClass, attributes)
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# If alternative base is set add the same user to the alternative base as well, if not act as if it was success
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if self.alt:
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rcode2 = self.ldapconnection.add(f'{id},{self.basealt}', objectClass, attributesalt)
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else:
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rcode2 = True
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# Return True only if both entries was successful
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return rcode1 and rcode2
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def changepassword(self, user, newpass, althash=''):
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'''
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Change password of user to newpass
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user := string containing username
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newpass := string containing new password
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althash := string containing password/hash for alternative base
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'''
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# This variable holds boolean indicating successful change of user password
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chpassbool = self.ldapconnection.modify(f'uid={user},{self.base}', {'userPassword': (MODIFY_REPLACE,[newpass])})
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# If alternative base is set modify user password/hash with althash, if not, pretend change was successful
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if self.alt:
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chpassboolalt = self.ldapconnection.modify(f'uid={user},{self.basealt}', {'userPassword': (MODIFY_REPLACE,[althash])})
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else:
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chpassboolalt = True
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# This variable holds boolean indicating successful change of shadowLastChange value to current time
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chlastchangebool = self.ldapconnection.modify(f'uid={user},{self.base}', {'shadowLastChange' : (MODIFY_REPLACE,[self.lastpwchangenow()])})
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# If alternative base is set modify user password/hash with althash, if not, pretend change was successful
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if self.alt:
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chlastchangeboolalt = self.ldapconnection.modify(f'uid={user},{self.base}', {'shadowLastChange' : (MODIFY_REPLACE, [self.lastpwchangenow()])})
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else:
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chlastchangeboolalt = True
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# Return True only if changing of both password and time of last password change was successful
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return chpassbool and chpassboolalt and chlastchangebool and chlastchangeboolalt
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def delete(self, user):
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'''
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Delete user given username of user
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user := string containing username
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'''
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rcode1 = self.ldapconnection.delete(f'uid={user},{self.base}')
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# If alternative base is set delete user from alternative base, if not, pretend deletion was successful
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if self.alt:
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rcode2 = self.ldapconnection.delete(f'uid={user},{self.basealt}')
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else:
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rcode2 = True
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# Return True only if deletion from both bases was successful
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return rcode1 and rcode2
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def getpassword(self, user):
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'''
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Retrive password of a user
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user := string containing username
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'''
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# Search LDAP entries that have object class inetOrgPerson and uid attribute equal to given user field
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self.ldapconnection.search(search_base=self.base,search_filter=f'(&(objectClass=inetOrgPerson)(uid={user}))', attributes=['userPassword'])
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# Return userPassword attribute from the response
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return self.ldapconnection.response[0]['attributes']['userPassword'][0].decode('utf-8')
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129
luser/routes.py
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129
luser/routes.py
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from flask import render_template, request, redirect
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from luser import app
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from luser.models import LUSER
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from passlib.hash import ldap_salted_sha1,sha512_crypt
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import subprocess
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import random
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import base64
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import os
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LDAPHOST = 'ldap.example.org'
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LDAPADMINNAME = 'cn=admin,dc=example,dc=org'
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LDAPPASS = 'verysecr3t'
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USERBASE = 'ou=Users,dc=example,dc=org'
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ALTUSERBASE = '' # Optional
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CAPTCHA_PATH = '/var/luser/luser/static/account/register/captcha_img/'
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@app.route('/account/changepassword/', methods=['POST', 'GET'])
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def changepassword():
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if request.method == 'GET':
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return render_template('changepassword.html')
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elif request.method == 'POST':
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username = request.form['username']
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oldpassword = request.form['oldpassword']
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newpassword = request.form['newpassword']
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# Check lenght of password
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if len(newpassword) < 8:
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return 'Error: password is too short'
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# Create a LUSER connection
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luser = LUSER(LDAPHOST,LDAPADMINNAME,LDAPPASS,USERBASE,ALTUSERBASE)
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if ldap_salted_sha1.verify(oldpassword, luser.getpassword(username)) == False:
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return 'Wrong username/password combination'
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ldaphash = ldap_salted_sha1.hash(newpassword)
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althash = sha512_crypt.hash(newpassword)
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# Try to change user password
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try:
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if luser.changepassword(username, ldaphash, althash) == True:
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return 'User password successfuly changed'
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else:
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return 'User password change failed'
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except:
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return 'User password change failed, exception raised'
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else:
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return 'HTTP request method not recogniezed'
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@app.route('/account/unregister/', methods=['POST', 'GET'])
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def unregister():
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if request.method == 'GET':
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return render_template('unregister.html')
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elif request.method == 'POST':
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username = request.form['username']
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password = request.form['password']
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# Create a LUSER connection
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luser = LUSER(LDAPHOST,LDAPADMINNAME,LDAPPASS,USERBASE,ALTUSERBASE)
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if ldap_salted_sha1.verify(password, luser.getpassword(username)) == False:
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return 'Wrong username/password combination'
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# Try to delete user
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try:
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if luser.delete(username) == True:
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return 'User successfuly unregistered'
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else:
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return 'User unregistration failed'
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except:
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return 'User unregistration failed, exception raised'
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else:
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return 'HTTP request method not recogniezed'
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@app.route('/account/register/', methods=['POST', 'GET'])
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def register():
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if request.method == 'GET':
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captcha_solution = str(random.randint(0,999999))
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captcha_hash = ldap_salted_sha1.hash(captcha_solution)
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captcha_filename = base64.b64encode(captcha_hash.encode('utf-8')).decode('utf-8')[8:-1] + ".png"
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captcha_path = CAPTCHA_PATH + captcha_filename
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captcha_file = open(captcha_path, 'w')
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subprocess.run(["/usr/local/bin/captcha.sh",captcha_solution],stdout=captcha_file)
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return render_template('register.html',imgsrc=captcha_filename,captchahash=captcha_hash)
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elif request.method == 'POST':
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username = request.form['username']
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password = request.form['password']
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captcha_answer = request.form['captchaa']
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captcha_filename = request.form['captchaq']
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captcha_path = CAPTCHA_PATH + captcha_filename
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if captcha_filename[:-4].isalnum() == False and len(captcha_filename) != 47 :
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return 'Error: Captcha question is manipulated'
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captcha_valid = True
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if os.path.exists(captcha_path) == False:
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captcha_valid = False
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else:
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os.remove(captcha_path)
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captcha_hash = base64.b64decode(base64.b64encode(b"{SSHA}").decode('utf-8') + captcha_filename[:-4] + "=").decode('utf-8')
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if ldap_salted_sha1.verify(captcha_answer, captcha_hash) == False:
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captcha_valid = False
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if captcha_valid == False:
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return 'Error: Captcha is wrong!'
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# Check lenght of password
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if len(password) < 8:
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return 'Error: password is too short'
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# Create a LUSER connection
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luser = LUSER(LDAPHOST,LDAPADMINNAME,LDAPPASS,USERBASE,ALTUSERBASE)
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# Try to add user
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try:
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ldaphash = ldap_salted_sha1.hash(password)
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althash = sha512_crypt.hash(password)
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#smtpctlout=subprocess.run(["smtpctl","encrypt", password],text=True,stdout=subprocess.PIPE)
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#smtpdhash=smtpctlout.stdout[:-1]
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if luser.add(username,ldaphash,althash):
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return 'User successfuly registered'
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else:
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return 'User registration failed, username probably taken'
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except:
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return 'User registration failed, exception raised'
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else:
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return 'HTTP request method not recogniezed'
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35
luser/templates/changepassword.html
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35
luser/templates/changepassword.html
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<!DOCTYPE html>
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<html lang="sr">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>User password change in LDAP system</title>
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<style>
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.container {
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max-width:900px;
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margin: 0 auto;
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font-family: Arial, Helvetica, sans-serif;
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color: #3d3d3d;
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}
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body {
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background-color: #e6e6e6;
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}
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</style>
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</head>
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<body>
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<main class="container">
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<h1 style="text-align:center;">Change password</h1>
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<form action="/account/changepassword/" method="POST" style="text-align:center;">
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<label for="username">username</label>
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<input type="text" name="username" id="username" placeholder="username" required>
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<label for="oldpassword">oldpassword</label>
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<input type="password" name="oldpassword" id="oldpassword" placeholder="oldpassword" required>
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<label for="newpassword">newpassword</label>
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<input type="password" name="newpassword" id="newpassword" placeholder="newpassword" required>
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<br>
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<button>Change Password</button>
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</form>
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</main>
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</body>
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</html>
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39
luser/templates/register.html
Normal file
39
luser/templates/register.html
Normal file
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<!DOCTYPE html>
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||||
<html lang="sr">
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||||
<head>
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||||
<meta charset="UTF-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>User registration to LDAP system</title>
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||||
<style>
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.container {
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||||
max-width:900px;
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||||
margin: 0 auto;
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||||
font-family: Arial, Helvetica, sans-serif;
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||||
color: #3d3d3d;
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||||
}
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||||
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||||
body {
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||||
background-color: #e6e6e6;
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||||
}
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||||
</style>
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||||
</head>
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||||
<body>
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<main class="container">
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<h1 style="text-align:center;">Register</h1>
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<form action="/account/register/" method="POST" style="text-align:center;">
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<label for="username">username</label>
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<input type="text" name="username" id="username" placeholder="username" required>
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||||
<label for="password">password</label>
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||||
<input type="password" name="password" id="password" placeholder="password" required>
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||||
<p>password must be at least 8 characters long<p>
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<br>
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<img src=/account/register/captcha_img/{{ imgsrc }} alt="{{ captchahash }}" style="width:200">
|
||||
<p>
|
||||
<label for="captcha answer">captcha answer</label>
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||||
<input type="text" name="captchaa" id="captchaa" placeholder="captcha answer" required>
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||||
<input type="hidden" name="captchaq" id="captchaq" value="{{ imgsrc }}">
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<button>Register</button>
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</form>
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</main>
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</body>
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</html>
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33
luser/templates/unregister.html
Normal file
33
luser/templates/unregister.html
Normal file
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<!DOCTYPE html>
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||||
<html lang="sr">
|
||||
<head>
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||||
<meta charset="UTF-8">
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||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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||||
<title>User unregistration to LDAP system</title>
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||||
<style>
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||||
.container {
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||||
max-width:900px;
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||||
margin: 0 auto;
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||||
font-family: Arial, Helvetica, sans-serif;
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||||
color: #3d3d3d;
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||||
}
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||||
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||||
body {
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||||
background-color: #e6e6e6;
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||||
}
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||||
</style>
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||||
</head>
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||||
<body>
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||||
<main class="container">
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||||
<h1 style="text-align:center;">Unregister</h1>
|
||||
<form action="/account/unregister/" method="POST" style="text-align:center;">
|
||||
<label for="username">username</label>
|
||||
<input type="text" name="username" id="username" placeholder="username" required>
|
||||
<label for="password">password</label>
|
||||
<input type="password" name="password" id="password" placeholder="password" required>
|
||||
<br>
|
||||
<button>Unregister</button>
|
||||
</form>
|
||||
</main>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue
Block a user