472 lines
20 KiB
Python
472 lines
20 KiB
Python
# Imports from django
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from django.shortcuts import render
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from django.views.generic import View
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from django.contrib.auth import authenticate, login, logout
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from django.contrib.auth.models import User
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from django.http import HttpResponse, HttpResponseRedirect
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from django.core.validators import validate_email, ValidationError
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from django.urls import reverse_lazy
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from django.contrib.auth.tokens import PasswordResetTokenGenerator
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from django.core.mail import EmailMessage
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from .models import ResetToken
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# Imports for the extra stuff not in django
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from base64 import b64encode, b64decode
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from datetime import datetime
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from random import choice, randint
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import string
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import os
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# Use ldap, like django_auth_backend
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import ldap
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from django.conf import settings
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class LDAP(object):
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def __init__(self):
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self.uri = settings.AUTH_LDAP_SERVER_URI
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self.user = settings.AUTH_LDAP_BIND_DN
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self.password = settings.AUTH_LDAP_BIND_PASSWORD
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# FIXME: take from settings
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self.search_base = os.environ['LDAPSEARCH']
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self.search_scope = ldap.SCOPE_SUBTREE
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self.search_filter = "objectClass=inetOrgPerson"
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# FIXME: hard coded
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self.dn = "uid={{}},{}".format(os.environ['LDAPCREATE'])
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self.gid = "10004"
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self.conn = ldap.initialize(self.uri)
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if settings.AUTH_LDAP_START_TLS:
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self.conn.start_tls_s()
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print("{} {} {}".format(self.uri, self.user, self.password))
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self.conn.bind_s(self.user, self.password)
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def check_user_exists(self, username):
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result = self.conn.search_s(self.search_base,
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self.search_scope,
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self.dn.format(username))
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if not len(result) == 0:
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return True
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else:
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return False
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def create_user(self, user, password, firstname, lastname, email):
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dn = self.dn.format(user)
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modlist = {
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"objectClass": ["inetOrgPerson", "posixAccount", "ldapPublickey"],
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"uid": [user],
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"sn": [lastname],
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"givenName": [firstname],
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"cn": ["{} {}".format(firstname, lastname)],
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"displayName": ["{} {}".format(firstname, lastname)],
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"uidNumber": ["{}".format(self.get_new_uid_number(conn))],
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"gidNumber": [self.gid],
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"loginShell": ["/bin/bash"],
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"homeDirectory": ["/home/{}".format(user)],
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"mail": email,
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"userPassword": password
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}
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result = self.conn.add_s(dn, ldap.modlist.addModlist(modlist))
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def get_new_uid_number(self):
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uidlist = [0]
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for result in self.conn.search_s(self.search_base,
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self.search_scope,
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self.search_filter):
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uidlist.append(int(result[1]['uidNumber'][0]))
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return sorted(uidlist)[-1] + 1
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class Index(View):
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def get(self, request):
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if request.user.is_authenticated:
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return render(request, 'useroptions.html', { 'user': request.user } )
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return render(request, 'landing.html')
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def post(self, request):
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username = request.POST.get('username')
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password = request.POST.get('password')
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pwd = r'%s' % password
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user = authenticate(request, username=username, password=pwd)
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if user is not None:
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login(request, user)
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return render(request, 'useroptions.html', { 'user': user } )
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return render(request, 'loginfailed.html')
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class Register(View):
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def get(self, request):
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return render(request, 'registeruser.html')
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# Someone filled out the register page, do some basic checks and throw it at nameko
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def post(self, request):
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l = LDAP()
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service = 'register an user'
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urlname = 'register'
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username = request.POST.get('username')
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if username == "" or not username:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please supply a username.' } )
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if l.check_user_exists(username):
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'User already exists.' } )
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password1 = request.POST.get('password1')
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password2 = request.POST.get('password2')
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if password1 != password2:
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return render(request, 'error.html', { 'urlname': urlname,
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'service': service,
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'error': "Passwords don't match." } )
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email = request.POST.get('email')
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try:
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validate_email(email)
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except ValidationError:
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return render(request, 'error.html', { 'urlname': urlname,
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'service': service,
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'error': 'The supplied email address is invalid.' } )
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firstname = request.POST.get('firstname')
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lastname = request.POST.get('lastname')
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if not firstname or not lastname:
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return render(request, 'error.html', { 'urlname': urlname,
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'service': service,
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'error': 'Please enter your firstname and lastname.' } )
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# so nothing strange happens if there are escapable chars
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pwd = r'%s' % password1
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l = LDAP()
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try:
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l.create_user(username, pwd, firstname, lastname, email)
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except Exception as e:
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return render(request, 'error.html', { 'urlname': urlname,
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'service': service,
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'error': e } )
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return render(request, 'usercreated.html', { 'user': username } )
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class ChangeData(View):
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# provide the form for the change request
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def get(self, request):
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urlname = 'change_data'
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service = 'get default data for logged in user'
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if not request.user.is_authenticated:
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return render(request, 'mustbeloggedin.html')
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user = request.user
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login(request, user)
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# get basic data (firstname, lastname, email)
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with get_pool().next() as rpc:
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(state, firstname, lastname, email) = rpc.getuserdata.get_data(str(request.user))
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# If it throws an error, the errormessage gets put into firstname.. not great naming, but works best this way
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if state == "error":
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': firstname } )
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# The template puts the old data as standard in the fields
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else:
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return render(request, 'changeuserdata.html', { 'user': str(request.user), 'firstname': firstname, 'lastname': lastname, 'email': email } )
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# get the change request
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def post(self, request):
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# variables for the error page
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service = 'change user data'
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urlname = 'change_data'
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# Only logged in users may change data
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if not request.user.is_authenticated:
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return render(request, 'mustbeloggedin.html')
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user = str(request.user)
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firstname = request.POST.get('firstname')
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lastname = request.POST.get('lastname')
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email = request.POST.get('email')
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# Some sanity checks for the supplied data
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if firstname == "":
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter a firstname.' } )
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elif lastname == "":
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter a lastname.' } )
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elif email == "":
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter an email.' } )
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try:
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validate_email(email)
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except ValidationError:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'The supplied email address is invalid.' } )
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# Trying to change the data
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with get_pool().next() as rpc:
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result = rpc.changeuserdata.change_data(user, firstname, lastname, email)
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# Data change worked
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if result == True:
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return render(request, 'changeddata.html', { 'user': user, 'firstname': firstname, 'lastname': lastname, 'email': email } )
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# Data change did not work, display error
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else:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': result } )
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class ResetPassword(View):
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def get(self, request):
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return render(request, 'resetpassword.html')
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def post(self, request):
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urlname = 'reset_password'
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service = 'send a password reset request'
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user = request.POST.get('user')
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# First, check if the user exists
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if not check_user_exists(user):
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'The user does not exist.' } )
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# user exists, so try to get email
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with get_pool().next() as rpc:
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(state, tmp1, tmp2, email) = rpc.getuserdata.get_data(user)
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# Either error with the datalookup or no email provided
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if state == "error" or email == 'No email given' or not email:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Unable to retrieve email address for user.' } )
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# Try to send the email out
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emailsend = self.email(user, email)
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# Email got sent out
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if emailsend == True:
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return render(request, 'send_resetrequest.html', { 'user': user } )
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# Error while trying to send email
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else:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': emailsend } )
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# Sends an email to the user with the 24h active link for a password reset
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def email(self, user, email):
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# getting epoch for the time now in UTC to spare us headache with timezones
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creationtime = int(datetime.utcnow().timestamp())
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# Construct the data for the email
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email_from = 'Userservice at ungleich <%s>' % config['EMAIL']['EMAILFROM']
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to = ['%s <%s>' % (user, email)]
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subject = 'Password reset request for %s' % user
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link = self.build_reset_link(user, creationtime)
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body = 'This is an automated email which was triggered by a reset request for the user %s. Please do not reply to this email.\n' % user
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body += 'If you received this email in error, please disregard it. If you get multiple emails like this, please contact us to look into potential abuse.\n'
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body += 'To reset your password, please follow the link below:\n'
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body += '%s\n\n' % link
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body += 'The link will remain active for 24 hours.\n'
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# Build the email
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mail = EmailMessage(
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subject=subject,
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body=body,
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from_email=email_from,
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to=to
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)
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try:
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mail.send()
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result = True
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except:
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result = "An error occurred while trying to send the mail."
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return result
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# Builds the reset link for the email and puts the token into the database
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def build_reset_link(self, user, epochutc):
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# set up the data
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host = 'account-staging.ungleich.ch'
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tokengen = PasswordResetTokenGenerator()
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# create some noise for use in the tokengenerator
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pseudouser = PseudoUser()
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token = tokengen.make_token(pseudouser)
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buser = bytes(user, 'utf-8')
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userpart = b64encode(buser)
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# create entry into the database
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newdbentry = ResetToken(user=user, token=token, creation=epochutc)
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newdbentry.save()
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# set up the link
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link = 'https://%s/reset/%s/%s/' % (host, userpart.decode('utf-8'), token)
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return link
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# Catch the resetrequest URL and check it
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class ResetRequest(View):
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# Gets the URL with user in b64 and the token, and checks it
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# Also cleans the database
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def get(self, request, user=None, token=None):
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# Cleans up outdated tokens
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# If we expect quite a bit of old tokens, maybe somewhere else is better,
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# but for now we don't really expect many unused tokens
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self.clean_db()
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# If user and token are not supplied by django, it was called from somewhere else, so it's
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# invalid
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if user == None or token == None:
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return HttpResponse('Invalid URL.', status=404)
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# extract user from b64 format
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tmp_user = bytes(user, 'utf-8')
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user = b64decode(tmp_user)
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user_clean = user.decode('utf-8')
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# set checks_out = True if token is found in database
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dbentries = ResetToken.objects.all().filter(user=user_clean)
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for entry in dbentries:
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if entry.token == token:
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# found the token, now delete it since it's used
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checks_out = True
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entry.delete()
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# No token was found
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if not checks_out:
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return HttpResponse('Invalid URL.', status=404)
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# Token was found, supply the form
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else:
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return render(request, 'resetpasswordnew.html', { 'user': user_clean } )
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# Gets the post form with the new password and sets it
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def post(self, request):
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service = 'reset the password'
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# get the supplied passwords
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password1 = request.POST.get("password1")
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password2 = request.POST.get("password2")
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# get the hidden value of user
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user = request.POST.get("user")
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# some checks over the supplied data
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if user == "" or not user:
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return render(request, 'error.html', { 'service': service, 'error': 'Something went wrong. Did you use the supplied form?' } )
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if password1 == "" or not password1 or password2 == "" or not password2:
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return render(request, 'error.html', { 'service': service, 'error': 'Please supply a password and confirm it.' } )
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if password1 != password2:
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return render(request, 'error.html', { 'service': service, 'error': 'The supplied passwords do not match.' } )
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if len(password1) < 8:
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return render(request, 'error.html', { 'service': service, 'error': 'The password is too short, please use a longer one. At least 8 characters.' } )
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# everything checks out, now change the password
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with get_pool().next() as rpc:
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pwd = r'%s' % password1
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result = rpc.changepassword.change_password(user, pwd)
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# password change successfull
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if result == True:
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return render(request, 'changedpassword.html', { 'user': user } )
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# Something went wrong while changing the password
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else:
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return render(request, 'error.html', { 'service': service, 'error': result } )
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# Cleans up outdated tokens
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def clean_db(self):
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# cutoff time is set to 24h hours
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# using utcnow() to have no headache with timezones
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cutoff = int(datetime.utcnow().timestamp()) - (24*60*60)
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# Get all tokens older than 24 hours
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oldtokens = ResetToken.objects.all().filter(creation__lt=cutoff)
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for token in oldtokens:
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# delete all tokens older than 24 hours
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token.delete()
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return True
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# The logged in user can change the password here
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class ChangePassword(View):
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# Presents the page for a logged in user
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def get(self, request):
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if not request.user.is_authenticated:
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return render(request, 'mustbeloggedin.html')
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return render(request, 'changepassword.html', { 'user': request.user } )
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# Does some checks on the supplied data and changes the password
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def post(self, request):
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# Variables for the error page
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urlname = 'change_password'
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service = 'change the password'
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if not request.user.is_authenticated:
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return render(request, 'mustbeloggedin.html')
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login(request, request.user)
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user = str(request.user)
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oldpassword = request.POST.get('oldpassword')
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check = authenticate(request, username=user, password=oldpassword)
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# Is the right password for the user supplied?
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if check is None:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Wrong password for the user.' } )
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password1 = request.POST.get('password1')
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password2 = request.POST.get('password2')
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# Are both passwords from the form the same?
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if password1 != password2:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service,
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'error': 'Please check if you typed the same password both times for the new password' } )
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# Check for password length
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if len(password1) < 8:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service,
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'error': 'The password is too short, please use a longer one. At least 8 characters.' } )
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with get_pool().next() as rpc:
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# Trying to change the password
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pwd = r'%s' % password1
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result = rpc.changepassword.change_password(user, pwd)
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# Password was changed
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if result == True:
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return render(request, 'changedpassword.html', { 'user': user } )
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# Password not changed, instead got some kind of error
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else:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': result } )
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# Deletes an account
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class DeleteAccount(View):
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# Show the basic form for deleting an account
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def get(self, request):
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return render(request, 'deleteaccount.html')
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# Reads the filled out form
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def post(self, request):
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# Variables for error page
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urlname = 'account_delete'
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service = 'delete an account'
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# Does the user exist?
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username = request.POST.get('username')
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if not check_user_exists(username):
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Unknown user.' } )
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# Do user and password match?
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password = request.POST.get('password')
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pwd = r'%s' % password
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check = authenticate(request, username=username, password=pwd)
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if check is None:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Wrong password for user.' } )
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# Try to delete the user
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with get_pool().next() as rpc:
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result = rpc.deleteuser.delete_user(username)
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# User deleted
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if result == True:
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logout(request)
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return render(request, 'deleteduser.html', { 'user': username } )
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# User not deleted, got some kind of error
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else:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': result } )
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# Log out the session
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class LogOut(View):
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def get(self, request):
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logout(request)
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return HttpResponse("You have been logged out.", status=200)
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# TO be clarified
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# To trick the tokengenerator to work with us, because we don't really
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# have the expected user Class since we are reading the user from a form
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# We store the tokens and don't have to use the check function,
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# some one time data works fine.
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class LastLogin():
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def replace(self, microsecond=0, tzinfo=None):
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return randint(1,100000)
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class PseudoUser():
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# easiest way to handle the check for lastlogin
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last_login = LastLogin()
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# random alphanumeric strings for primary key and password, just used for token generation
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pk = ''.join(choice(string.ascii_letters + string.digits) for _ in range(20))
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password = ''.join(choice(string.ascii_letters + string.digits) for _ in range(30))
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