Add detection for users from trusted/invalid realms

When user from other realm than FreeIPA's tries to use Web UI
(login via forms-based auth or with valid trusted realm ticket),
the 401 Unauthorized error with X-Ipa-Rejection-Reason=denied
is returned.

Also, the support for usernames of the form user@SERVER.REALM
or user@server.realm was added.

https://fedorahosted.org/freeipa/ticket/3252

ipalib/util.py

@@ -105,6 +105,21 @@ def validate_host_dns(log, fqdn):
         )
         raise errors.DNSNotARecordError()
 
+def normalize_name(name):
+    result = dict()
+    components = name.split('@')
+    if len(components) == 2:
+        result['domain'] = unicode(components[1]).lower()
+        result['name'] = unicode(components[0]).lower()
+    else:
+        components = name.split('\\')
+        if len(components) == 2:
+            result['flatname'] = unicode(components[0]).lower()
+            result['name'] = unicode(components[1]).lower()
+        else:
+            result['name'] = unicode(name).lower()
+    return result
+
 def isvalid_base64(data):
     """
     Validate the incoming data as valid base64 data or not.

ipaserver/dcerpc.py

@@ -31,6 +31,7 @@ from ipapython import ipautil
 from ipapython.ipa_log_manager import *
 from ipapython.dn import DN
 from ipaserver.install import installutils
+from ipalib.util import normalize_name
 
 import os, string, struct, copy
 import uuid
@@ -184,21 +185,6 @@ class DomainValidator(object):
                 return True
         return False
 
-    def normalize_name(self, name):
-        result = dict()
-        components = name.split('@')
-        if len(components) == 2:
-            result['domain'] = unicode(components[1]).lower()
-            result['name'] = unicode(components[0]).lower()
-        else:
-            components = name.split('\\')
-            if len(components) == 2:
-                result['flatname'] = unicode(components[0]).lower()
-                result['name'] = unicode(components[1]).lower()
-            else:
-                result['name'] = unicode(name).lower()
-        return result
-
     def get_sid_trusted_domain_object(self, object_name):
         """Returns SID for the trusted domain object (user or group only)"""
         if not self.domain:
@@ -209,7 +195,8 @@ class DomainValidator(object):
         if len(self._domains) == 0:
             # Our domain is configured but no trusted domains are configured
             return None
-        components = self.normalize_name(object_name)
+
+        components = normalize_name(object_name)
         if not ('domain' in components or 'flatname' in components):
             # No domain or realm specified, ambiguous search
             return False

ipaserver/plugins/ldap2.py

@@ -727,6 +727,8 @@ class ldap2(CrudBackend):
         except _ldap.SERVER_DOWN:
             raise NetworkError(uri=self.ldap_uri,
                                error=u'LDAP Server Down')
+        except _ldap.LOCAL_ERROR:
+            raise errors.ACIError(info=info)
         except _ldap.SUCCESS:
             pass
         except _ldap.LDAPError, e:

ipaserver/rpcserver.py

@@ -40,7 +40,7 @@ from ipalib.backend import Executioner
 from ipalib.errors import PublicError, InternalError, CommandError, JSONError, ConversionError, CCacheError, RefererError, InvalidSessionPassword, NotFound, ACIError, ExecutionError
 from ipalib.request import context, Connection, destroy_context
 from ipalib.rpc import xml_dumps, xml_loads
-from ipalib.util import parse_time_duration
+from ipalib.util import parse_time_duration, normalize_name
 from ipapython.dn import DN
 from ipaserver.plugins.ldap2 import ldap2
 from ipapython.compat import json
@@ -809,7 +809,11 @@ class jsonserver_session(jsonserver, KerberosSession):
         # Store the session data in the per-thread context
         setattr(context, 'session_data', session_data)
 
-        self.create_context(ccache=ipa_ccache_name)
+        # This may fail if a ticket from wrong realm was handled via browser
+        try:
+            self.create_context(ccache=ipa_ccache_name)
+        except ACIError, e:
+            return self.unauthorized(environ, start_response, str(e), 'denied')
 
         try:
             response = super(jsonserver_session, self).__call__(environ, start_response)
@@ -927,6 +931,35 @@ class login_password(Backend, KerberosSession, HTTP_Status):
         else:
             return self.bad_request(environ, start_response, "no user specified")
 
+        # allows login in the form user@SERVER_REALM or user@server_realm
+        # FIXME: uppercasing may be removed when better handling of UPN
+        #        is introduced
+
+        parts = normalize_name(user)
+
+        if "domain" in parts:
+            # username is of the form user@SERVER_REALM or user@server_realm
+
+            # check whether the realm is server's realm
+            # Users from other realms are not supported
+            # (they do not have necessary LDAP entry, LDAP connect will fail)
+
+            if parts["domain"].upper()==self.api.env.realm:
+                user=parts["name"]
+            else:
+                return self.unauthorized(environ, start_response, '', 'denied')
+
+        elif "flatname" in parts:
+            # username is of the form NetBIOS\user
+            return self.unauthorized(environ, start_response, '', 'denied')
+
+        else:
+            # username is of the form user or of some wild form, e.g.
+            # user@REALM1@REALM2 or NetBIOS1\NetBIOS2\user (see normalize_name)
+
+            # wild form username will fail at kinit, so nothing needs to be done
+            pass
+
         password = query_dict.get('password', None)
         if password is not None:
             if len(password) == 1: