ungleich-user/dal/views.py

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# Imports from django
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from django.shortcuts import render
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from django.views.generic import View, FormView
from django.contrib.auth import authenticate, login, logout
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from django.contrib.auth.models import User
from django.http import HttpResponse, HttpResponseRedirect
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
from django.core.mail import EmailMessage
from .models import ResetToken
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from .forms import LoginForm
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from .ungleich_ldap import LdapManager
# Imports for the extra stuff not in django
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from base64 import b64encode, b64decode
from datetime import datetime
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from random import choice, randint
import string
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import os
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# Use ldap, like django_auth_backend
import ldap
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import ldap.modlist as modlist
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from django.conf import settings
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class Index(FormView):
template_name = "landing.html"
form_class = LoginForm
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success_url = 'useroptions.html'
def form_valid(self, form):
email = form.cleaned_data.get('email')
password = form.cleaned_data.get('password')
user = authenticate(username=email, password=password)
if user is not None:
login(self.request, user)
return render(self.request, 'useroptions.html', { 'user': user } )
return render(self.request, 'loginfailed.html')
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class Register(View):
def get(self, request):
return render(request, 'registeruser.html')
# Someone filled out the register page, do some basic checks and throw it at nameko
def post(self, request):
service = 'register an user'
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urlname = 'register'
username = request.POST.get('username')
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if username == "" or not username:
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please supply a username.' } )
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password1 = request.POST.get('password1')
password2 = request.POST.get('password2')
if password1 != password2:
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return render(request, 'error.html', { 'urlname': urlname,
'service': service,
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'error': "Passwords don't match." } )
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email = request.POST.get('email')
try:
validate_email(email)
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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firstname = request.POST.get('firstname')
lastname = request.POST.get('lastname')
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if not firstname or not lastname:
return render(request, 'error.html', { 'urlname': urlname,
'service': service,
'error': 'Please enter your firstname and lastname.' } )
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# so nothing strange happens if there are escapable chars
pwd = r'%s' % password1
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try:
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ldap_manager = LdapManager()
ldap_manager.create_user(
username, pwd, firstname, lastname, email
)
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except Exception as e:
return render(request, 'error.html', { 'urlname': urlname,
'service': service,
'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
def get(self, request):
urlname = 'change_data'
service = 'get default data for logged in user'
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if not request.user.is_authenticated:
return render(request, 'mustbeloggedin.html')
user = request.user
ldap_manager = LdapManager()
user_exists, entries = ldap_manager.check_user_exists(
uid=user.username,
is_customer=True,
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attributes=['uid', 'givenName', 'sn', 'mail']
)
if user_exists:
return render(
request,
'changeuserdata.html',
{ 'user': user.username,
'firstname': entries[0].givenName
if entries[0].givenName.value is not None else '',
'lastname': entries[0].sn
if entries[0].sn.value is not None else '',
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'email': entries[0].mail
if entries[0].mail.value is not None else ''}
)
else:
return render(request, 'error.html',
{'urlname': urlname, 'service': service,
'error': request.user.username})
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# get the change request
def post(self, request):
# variables for the error page
service = 'change user data'
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urlname = 'change_data'
# Only logged in users may change data
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if not request.user.is_authenticated:
return render(request, 'mustbeloggedin.html')
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firstname = request.POST.get('firstname')
lastname = request.POST.get('lastname')
email = request.POST.get('email')
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# Some sanity checks for the supplied data
if firstname == "":
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter a firstname.' } )
elif lastname == "":
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter a lastname.' } )
elif email == "":
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Please enter an email.' } )
try:
validate_email(email)
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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ldap_manager = LdapManager()
result, msg = ldap_manager.change_user_details(
uid=request.user.username,
details={"givenName": firstname, "sn": lastname, "mail": email}
)
# Data change worked
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if result:
return render(request, 'changeddata.html', { 'user': request.user.username, 'firstname': firstname, 'lastname': lastname, 'email': email } )
# Data change did not work, display error
else:
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return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': msg } )
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class ResetPassword(View):
def get(self, request):
return render(request, 'resetpassword.html')
def post(self, request):
urlname = 'reset_password'
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
if not check_user_exists(user):
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'The user does not exist.' } )
# user exists, so try to get email
with get_pool().next() as rpc:
(state, tmp1, tmp2, email) = rpc.getuserdata.get_data(user)
# Either error with the datalookup or no email provided
if state == "error" or email == 'No email given' or not email:
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Unable to retrieve email address for user.' } )
# Try to send the email out
emailsend = self.email(user, email)
# Email got sent out
if emailsend == True:
return render(request, 'send_resetrequest.html', { 'user': user } )
# Error while trying to send email
else:
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
creationtime = int(datetime.utcnow().timestamp())
# Construct the data for the email
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email_from = 'Userservice at ungleich <%s>' % config['EMAIL']['EMAILFROM']
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)
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'
body += 'To reset your password, please follow the link below:\n'
body += '%s\n\n' % link
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body += 'The link will remain active for 24 hours.\n'
# Build the email
mail = EmailMessage(
subject=subject,
body=body,
from_email=email_from,
to=to
)
try:
mail.send()
result = True
except:
result = "An error occurred while trying to send the mail."
return result
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# Builds the reset link for the email and puts the token into the database
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()
# create some noise for use in the tokengenerator
pseudouser = PseudoUser()
token = tokengen.make_token(pseudouser)
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buser = bytes(user, 'utf-8')
userpart = b64encode(buser)
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# create entry into the database
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newdbentry = ResetToken(user=user, token=token, creation=epochutc)
newdbentry.save()
# set up the link
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link = 'https://%s/reset/%s/%s/' % (host, userpart.decode('utf-8'), token)
return link
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# Catch the resetrequest URL and check it
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class ResetRequest(View):
# Gets the URL with user in b64 and the token, and checks it
# Also cleans the database
def get(self, request, user=None, token=None):
# Cleans up outdated tokens
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# If we expect quite a bit of old tokens, maybe somewhere else is better,
# 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
# invalid
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if user == None or token == None:
return HttpResponse('Invalid URL.', status=404)
# extract user from b64 format
tmp_user = bytes(user, 'utf-8')
user = b64decode(tmp_user)
user_clean = user.decode('utf-8')
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# set checks_out = True if token is found in database
dbentries = ResetToken.objects.all().filter(user=user_clean)
for entry in dbentries:
if entry.token == token:
# found the token, now delete it since it's used
checks_out = True
entry.delete()
# No token was found
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if not checks_out:
return HttpResponse('Invalid URL.', status=404)
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# Token was found, supply the form
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else:
return render(request, 'resetpasswordnew.html', { 'user': user_clean } )
# Gets the post form with the new password and sets it
def post(self, request):
service = 'reset the password'
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# get the supplied passwords
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password1 = request.POST.get("password1")
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
if user == "" or not user or user != self.request.user.username:
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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:
return render(request, 'error.html', { 'service': service, 'error': 'Please supply a password and confirm it.' } )
if password1 != password2:
return render(request, 'error.html', { 'service': service, 'error': 'The supplied passwords do not match.' } )
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if len(password1) < 8:
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
ldap_manager = LdapManager()
result = ldap_manager.change_password(
user,
password1
)
# password change successful
if result:
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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:
return render(request, 'error.html', { 'service': service, 'error': result } )
# Cleans up outdated tokens
def clean_db(self):
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# cutoff time is set to 24h hours
# using utcnow() to have no headache with timezones
cutoff = int(datetime.utcnow().timestamp()) - (24*60*60)
# Get all tokens older than 24 hours
oldtokens = ResetToken.objects.all().filter(creation__lt=cutoff)
for token in oldtokens:
# delete all tokens older than 24 hours
token.delete()
return True
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# The logged in user can change the password here
class ChangePassword(View):
# Presents the page for a logged in user
def get(self, request):
if not request.user.is_authenticated:
return render(request, 'mustbeloggedin.html')
return render(request, 'changepassword.html', { 'user': request.user } )
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# Does some checks on the supplied data and changes the password
def post(self, request):
# Variables for the error page
urlname = 'change_password'
service = 'change the password'
if not request.user.is_authenticated:
return render(request, 'mustbeloggedin.html')
login(request, request.user)
user = str(request.user)
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oldpassword = request.POST.get('oldpassword')
check = authenticate(request, username=user, password=oldpassword)
# Is the right password for the user supplied?
if check is None:
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Wrong password for the user.' } )
password1 = request.POST.get('password1')
password2 = request.POST.get('password2')
# Are both passwords from the form the same?
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
if len(password1) < 8:
return render(request, 'error.html', { 'urlname': urlname, 'service': service,
'error': 'The password is too short, please use a longer one. At least 8 characters.' } )
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from .ungleich_ldap import LdapManager
ldap_manager = LdapManager()
result = ldap_manager.change_password(
user,
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password1
)
# Password was changed
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if result:
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return render(request, 'changedpassword.html', { 'user': user } )
# Password not changed, instead got some kind of error
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else:
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):
# 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):
# Variables for error page
urlname = 'account_delete'
service = 'delete an account'
# Does the user exist?
username = request.POST.get('username')
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if not check_user_exists(username):
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Unknown user.' } )
# Do user and password match?
password = request.POST.get('password')
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pwd = r'%s' % password
check = authenticate(request, username=username, password=pwd)
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if check is None:
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': 'Wrong password for user.' } )
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# Try to delete the user
with get_pool().next() as rpc:
result = rpc.deleteuser.delete_user(username)
# User deleted
if result == True:
logout(request)
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return render(request, 'deleteduser.html', { 'user': username } )
# User not deleted, got some kind of error
else:
return render(request, 'error.html', { 'urlname': urlname, 'service': service, 'error': result } )
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# Log out the session
class LogOut(View):
def get(self, request):
logout(request)
return HttpResponse("You have been logged out.", status=200)
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# TO be clarified
# To trick the tokengenerator to work with us, because we don't really
# have the expected user Class since we are reading the user from a form
# We store the tokens and don't have to use the check function,
# some one time data works fine.
class LastLogin():
def replace(self, microsecond=0, tzinfo=None):
return randint(1,100000)
class PseudoUser():
# easiest way to handle the check for lastlogin
last_login = LastLogin()
# random alphanumeric strings for primary key and password, just used for token generation
pk = ''.join(choice(string.ascii_letters + string.digits) for _ in range(20))
password = ''.join(choice(string.ascii_letters + string.digits) for _ in range(30))