[testlib] New test for testing SSH host keys

hpctestlib/system/ssh/host_keys.py

@@ -0,0 +1,62 @@
+# Copyright 2016-2023 Swiss National Supercomputing Centre (CSCS/ETH Zurich)
+# ReFrame Project Developers. See the top-level LICENSE file for details.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+import time
+
+import reframe as rfm
+import reframe.utility.sanity as sn
+import reframe.utility.typecheck as typ
+
+
+@rfm.simple_test
+class ssh_host_keys_check(rfm.RunOnlyRegressionTest):
+    '''SSH host keys age check
+
+    The ssh host keys should be renewed regularly.
+    In this case, we are checking against the
+    max_key_age variable
+    '''
+
+    #: Parameter list with all host keys to check
+    #:
+    #: The test is skipped if a key is not found
+    #:
+    #: :type: :class:`str`
+    #: :values: ``['/etc/ssh/ssh_host_rsa_key',
+    #:              '/etc/ssh/ssh_host_ecdsa_key',
+    #:              '/etc/ssh/ssh_host_ed25519_key']``
+    ssh_host_keys = parameter([
+        '/etc/ssh/ssh_host_rsa_key',
+        '/etc/ssh/ssh_host_ecdsa_key',
+        '/etc/ssh/ssh_host_ed25519_key',
+    ], fmt=lambda x: x.split('_')[2], loggable=True)
+
+    #: The max age of the keys in ReFrame duration format
+    #:
+    #: :type: :class:`str`
+    #: :default: ``'365d'``
+    max_key_age = variable(str, value='365d', loggable=True)
+
+    executable = 'stat'
+    executable_opts = ['-c', '%Y']
+    tags = {'system', 'ssh'}
+
+    @run_after('init')
+    def set_hosts_keys(self):
+        self.executable_opts += [self.host_keys]
+
+    @sanity_function
+    def assert_file_age(self):
+        current_time = time.time()
+
+        skip_me = sn.extractall('No such file or directory', self.stderr)
+        self.skip_if(skip_me, msg=f'Skipping test because {self.host_keys}'
+                                  f' was not found')
+
+        return sn.assert_lt(current_time -
+                         sn.extractsingle(r'\d+', self.stdout, 0, int),
+                         typ.Duration(self.max_key_age),
+                         msg=f'File {self.host_keys} is older than '
+                             f'{self.max_key_age}')