Add django_ldap_auth

In the ldap.Dockerfile the django_ldap_auth module is installed to
enable authentication againt LDAP servers.

configuration/ldap_config.py

@@ -0,0 +1,55 @@
+import ldap
+import os
+
+from django_auth_ldap.config import LDAPSearch, GroupOfNamesType
+
+# Server URI
+AUTH_LDAP_SERVER_URI = os.environ.get('AUTH_LDAP_SERVER_URI', '')
+
+# The following may be needed if you are binding to Active Directory.
+AUTH_LDAP_CONNECTION_OPTIONS = {
+    ldap.OPT_REFERRALS: 0
+}
+
+# Set the DN and password for the NetBox service account.
+AUTH_LDAP_BIND_DN = os.environ.get('AUTH_LDAP_BIND_DN', '')
+AUTH_LDAP_BIND_PASSWORD = os.environ.get('AUTH_LDAP_BIND_PASSWORD', '')
+
+# Include this setting if you want to ignore certificate errors. This might be needed to accept a self-signed cert.
+# Note that this is a NetBox-specific setting which sets:
+#     ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, ldap.OPT_X_TLS_NEVER)
+LDAP_IGNORE_CERT_ERRORS = True
+
+AUTH_LDAP_USER_SEARCH = LDAPSearch(os.environ.get('AUTH_LDAP_USER_SEARCH_BASEDN', ''),
+                                    ldap.SCOPE_SUBTREE,
+                                    "(sAMAccountName=%(user)s)")
+
+# This search ought to return all groups to which the user belongs. django_auth_ldap uses this to determine group
+# heirarchy.
+AUTH_LDAP_GROUP_SEARCH = LDAPSearch(os.environ.get('AUTH_LDAP_GROUP_SEARCH_BASEDN', ''), ldap.SCOPE_SUBTREE,
+                                    "(objectClass=group)")
+AUTH_LDAP_GROUP_TYPE = GroupOfNamesType()
+
+# Define a group required to login.
+AUTH_LDAP_REQUIRE_GROUP = os.environ.get('AUTH_LDAP_REQUIRE_GROUP_DN', '')
+
+# Define special user types using groups. Exercise great caution when assigning superuser status.
+AUTH_LDAP_USER_FLAGS_BY_GROUP = {
+    "is_active": os.environ.get('AUTH_LDAP_REQUIRE_GROUP_DN', ''),
+    "is_staff": os.environ.get('AUTH_LDAP_IS_ADMIN_DN', ''),
+    "is_superuser": os.environ.get('AUTH_LDAP_IS_SUPERUSER_DN', '')
+}
+
+# For more granular permissions, we can map LDAP groups to Django groups.
+AUTH_LDAP_FIND_GROUP_PERMS = True
+
+# Cache groups for one hour to reduce LDAP traffic
+AUTH_LDAP_CACHE_GROUPS = True
+AUTH_LDAP_GROUP_CACHE_TIMEOUT = 3600
+
+# Populate the Django user from the LDAP directory.
+AUTH_LDAP_USER_ATTR_MAP = {
+    "first_name": os.environ.get('AUTH_LDAP_ATTR_FIRSTNAME', 'givenName'),
+    "last_name": os.environ.get('AUTH_LDAP_ATTR_LASTNAME', 'sn'),
+    "email": os.environ.get('AUTH_LDAP_ATTR_MAIL', 'mail')
+}