import pam

from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.backends import ModelBackend

class PAMBackend(ModelBackend):
    def authenticate(self, username=None, password=None):
        if pam.authenticate(username, password):
            try:
                user = User.objects.get(username=username)
            except:
                user = User(username=username, password='not stored here')
                user.set_unusable_password()

                if getattr(settings, 'PAM_IS_SUPERUSER', False):
                  user.is_superuser = True

                if getattr(settings, 'PAM_IS_STAFF', user.is_superuser):
                  user.is_staff = True

                user.save()
            return user
        return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None

import pam

from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.backends import ModelBackend

class PAMBackend(ModelBackend):

    SERVICE = getattr(settings, 'PAM_SERVICE', 'login')

    def authenticate(self, username=None, password=None):
        if pam.authenticate(username, password, service=service):
            try:
                user = User.objects.get(username=username)
            except:
                user = User(username=username, password='not stored here')
                user.set_unusable_password()

                if getattr(settings, 'PAM_IS_SUPERUSER', False):
                  user.is_superuser = True

                if getattr(settings, 'PAM_IS_STAFF', user.is_superuser):
                  user.is_staff = True

                user.save()
            return user
        return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None

Add the PAM_SERVICE setting to select a custom pam service for authentication
Add the PAM_SERVICE setting to select a custom pam service for authentication

  import pam
  
  from django.conf import settings
  from django.contrib.auth.models import User
  from django.contrib.auth.backends import ModelBackend
  
  class PAMBackend(ModelBackend):
+ 
+     SERVICE = getattr(settings, 'PAM_SERVICE', 'login')
+ 
      def authenticate(self, username=None, password=None):
-         if pam.authenticate(username, password):
+         if pam.authenticate(username, password, service=service):
              try:
                  user = User.objects.get(username=username)
              except:
                  user = User(username=username, password='not stored here')
                  user.set_unusable_password()
  
                  if getattr(settings, 'PAM_IS_SUPERUSER', False):
                    user.is_superuser = True
  
                  if getattr(settings, 'PAM_IS_STAFF', user.is_superuser):
                    user.is_staff = True
  
                  user.save()
              return user
          return None
  
      def get_user(self, user_id):
          try:
              return User.objects.get(pk=user_id)
          except User.DoesNotExist:
              return None
  
Add the PAM_SERVICE setting to select a custom pam service for authentication
## Code Before:
import pam

from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.backends import ModelBackend

class PAMBackend(ModelBackend):
    def authenticate(self, username=None, password=None):
        if pam.authenticate(username, password):
            try:
                user = User.objects.get(username=username)
            except:
                user = User(username=username, password='not stored here')
                user.set_unusable_password()

                if getattr(settings, 'PAM_IS_SUPERUSER', False):
                  user.is_superuser = True

                if getattr(settings, 'PAM_IS_STAFF', user.is_superuser):
                  user.is_staff = True

                user.save()
            return user
        return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None

## Instruction:
Add the PAM_SERVICE setting to select a custom pam service for authentication
## Code After:
import pam

from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.backends import ModelBackend

class PAMBackend(ModelBackend):

    SERVICE = getattr(settings, 'PAM_SERVICE', 'login')

    def authenticate(self, username=None, password=None):
        if pam.authenticate(username, password, service=service):
            try:
                user = User.objects.get(username=username)
            except:
                user = User(username=username, password='not stored here')
                user.set_unusable_password()

                if getattr(settings, 'PAM_IS_SUPERUSER', False):
                  user.is_superuser = True

                if getattr(settings, 'PAM_IS_STAFF', user.is_superuser):
                  user.is_staff = True

                user.save()
            return user
        return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None
