ACL: Allow hosts to remove services they manage

Allow hosts to delete services they own. This is an ACL that complements
existing one that allows to create services on the same host.

Add a test that creates a host and then attempts to create and delete a
service using its own host keytab.

Fixes: https://pagure.io/freeipa/issue/7486
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

install/updates/20-aci.update

@@ -124,10 +124,11 @@ add:aci: (targetfilter="(|(objectclass=ipaHost)(objectclass=ipaService))")(targe
 dn: $SUFFIX
 add:aci:(targetattr = "usercertificate")(version 3.0;acl "selfservice:Users can manage their own X.509 certificates";allow (write) userdn = "ldap:///self";)
 
-# Hosts can add their own services
+# Hosts can add and delete their own services
 dn: cn=services,cn=accounts,$SUFFIX
 remove:aci: (target = "ldap:///krbprincipalname=*/($$dn)@$REALM,cn=services,cn=accounts,$SUFFIX")(targetfilter = "(objectClass=ipaKrbPrincipal)")(version 3.0;acl "Hosts can add own services"; allow(add) userdn="ldap:///fqdn=($$dn),cn=computers,cn=accounts,$SUFFIX";)
 add:aci: (target = "ldap:///krbprincipalname=*/($$dn)@$REALM,cn=services,cn=accounts,$SUFFIX")(targetfilter = "(objectClass=ipaService)")(version 3.0;acl "Hosts can add own services"; allow(add) userdn="ldap:///fqdn=($$dn),cn=computers,cn=accounts,$SUFFIX";)
+add:aci: (target = "ldap:///krbprincipalname=*/($$dn)@$REALM,cn=services,cn=accounts,$SUFFIX")(targetfilter = "(objectClass=ipaService)")(version 3.0;acl "Hosts can delete own services"; allow(delete) userdn="ldap:///fqdn=($$dn),cn=computers,cn=accounts,$SUFFIX";)
 
 # CIFS service on the master can manage ID ranges
 dn: cn=ranges,cn=etc,$SUFFIX

ipatests/test_xmlrpc/test_service_plugin.py

@@ -31,6 +31,7 @@ from ipatests.test_xmlrpc.test_user_plugin import get_user_result, get_group_dn
 
 from ipatests.test_xmlrpc.tracker.service_plugin import ServiceTracker
 from ipatests.test_xmlrpc.tracker.host_plugin import HostTracker
+from ipatests.util import change_principal, host_keytab
 
 import base64
 from ipapython.dn import DN
@@ -1343,3 +1344,30 @@ class TestAuthenticationIndicators(XMLRPC_test):
             updates={u'krbprincipalauthind': u'radius'},
             expected_updates={u'krbprincipalauthind': [u'radius']}
         )
+
+
+@pytest.fixture(scope='function')
+def managing_host(request):
+    tracker = HostTracker(name=u'managinghost2', fqdn=fqdn2)
+    return tracker.make_fixture(request)
+
+
+@pytest.fixture(scope='function')
+def managed_service(request):
+    tracker = ServiceTracker(
+        name=u'managed-service', host_fqdn=fqdn2)
+    return tracker.make_fixture(request)
+
+
+@pytest.mark.tier1
+class TestManagedServices(XMLRPC_test):
+    def test_managed_service(
+            self, managing_host, managed_service):
+        """ Add a host and then add a service as a host
+            Finally, remove the service as a host """
+        managing_host.ensure_exists()
+        with host_keytab(managing_host.name) as keytab_filename:
+            with change_principal(managing_host.attrs['krbcanonicalname'][0],
+                                  keytab=keytab_filename):
+                managed_service.create()
+                managed_service.delete()