Add a basic test suite for kadmin.local interface

This small integration suite tests some basic operations using
kadmin.local interface on services in both kerberos and services
subtree.

https://fedorahosted.org/freeipa/ticket/6561

Reviewed-By: Pavel Vomacka <pvomacka@redhat.com>

ipatests/test_ipaserver/test_kadmin.py

@@ -0,0 +1,125 @@
+#
+# Copyright (C) 2016 FreeIPA Contributors see COPYING for license
+#
+
+"""
+Test suite for creating principals via kadmin.local and modifying their keys
+"""
+
+import os
+import pytest
+import tempfile
+
+from ipalib import api
+
+from ipaserver.install import installutils
+
+
+@pytest.yield_fixture()
+def keytab():
+    fd, keytab_path = tempfile.mkstemp(suffix='.keytab')
+    os.close(fd)
+
+    try:
+        yield keytab_path
+    finally:
+        try:
+            os.remove(keytab_path)
+        except OSError:
+            pass
+
+
+@pytest.fixture()
+def service_in_kerberos_subtree(request):
+    princ = u'svc1/{0.host}@{0.realm}'.format(api.env)
+    installutils.kadmin_addprinc(princ)
+
+    def fin():
+        try:
+            installutils.kadmin(
+                'delprinc -force {}'.format(princ))
+        except Exception:
+            pass
+    request.addfinalizer(fin)
+    return princ
+
+
+@pytest.fixture()
+def service_in_service_subtree(request):
+    princ = u'svc2/{0.host}@{0.realm}'.format(api.env)
+    rpcclient = api.Backend.rpcclient
+    was_connected = rpcclient.isconnected()
+
+    if not was_connected:
+        rpcclient.connect()
+
+    api.Command.service_add(princ)
+
+    def fin():
+        try:
+            api.Command.service_del(princ)
+        except Exception:
+            pass
+
+        try:
+            if not was_connected:
+                rpcclient.disconnect()
+        except Exception:
+            pass
+
+    request.addfinalizer(fin)
+    return princ
+
+
+@pytest.fixture(params=[service_in_kerberos_subtree,
+                        service_in_service_subtree])
+def service(request):
+    return request.param(request)
+
+
+@pytest.mark.skipif(
+    os.getuid() != 0, reason="kadmin.local is accesible only to root")
+class TestKadmin(object):
+    def assert_success(self, command, *args):
+        """
+        Since kadmin.local returns 0 also when internal errors occur, we have
+        to catch the command's stderr and check that it is empty
+        """
+        result = command(*args)
+        assert not result.error_output
+
+    def test_create_keytab(self, service, keytab):
+        """
+        tests that ktadd command works for both types of services
+        """
+        self.assert_success(
+            installutils.create_keytab,
+            keytab,
+            service)
+
+    def test_change_key(self, service, keytab):
+        """
+        tests that both types of service can have passwords changed using
+        kadmin
+        """
+        self.assert_success(
+            installutils.create_keytab,
+            keytab,
+            service)
+        self.assert_success(
+            installutils.kadmin,
+            'change_password -randkey {}'.format(service))
+
+    def test_append_key(self, service, keytab):
+        """
+        Tests that we can create a new keytab for both service types and then
+        append new keys to it
+        """
+        self.assert_success(
+            installutils.create_keytab,
+            keytab,
+            service)
+        self.assert_success(
+            installutils.create_keytab,
+            keytab,
+            service)