ipatests: Test empty cert request doesn't force certmonger to segfault

When empty cert request is submitted to certmonger, it goes to
segfault. This fix test that if something like this happens,
certmonger should gracefuly handle it

and some PEP8 fixes

related: https://pagure.io/certmonger/issue/191

Signed-off-by: Mohammad Rizwan <myusuf@redhat.com>

ipatests/test_integration/test_cert.py

@@ -14,6 +14,7 @@ import random
 import re
 import string
 import time
+import textwrap
 
 from ipaplatform.paths import paths
 from ipapython.dn import DN
@@ -193,7 +194,7 @@ class TestInstallMasterClient(IntegrationTest):
         tasks.kinit_admin(self.master)
         tasks.user_add(self.master, user)
 
-        for id in (0,1):
+        for id in (0, 1):
             csr_file = f'{id}.csr'
             key_file = f'{id}.key'
             cert_file = f'{id}.crt'
@@ -584,3 +585,79 @@ class TestCAShowErrorHandling(IntegrationTest):
         error_msg = 'ipa: ERROR: The certificate for ' \
                     '{} is not available on this server.'.format(lwca)
         assert error_msg in result.stderr_text
+
+    def test_certmonger_empty_cert_not_segfault(self):
+        """Test empty cert request doesn't force certmonger to segfault
+
+        Test scenario:
+        create a cert request file in /var/lib/certmonger/requests which is
+        missing most of the required information, and ask request a new
+        certificate to certmonger. The wrong request file should not make
+        certmonger crash.
+
+        related: https://pagure.io/certmonger/issue/191
+        """
+        empty_cert_req_content = textwrap.dedent("""
+        id=dogtag-ipa-renew-agent
+        key_type=UNSPECIFIED
+        key_gen_type=UNSPECIFIED
+        key_size=0
+        key_gen_size=0
+        key_next_type=UNSPECIFIED
+        key_next_gen_type=UNSPECIFIED
+        key_next_size=0
+        key_next_gen_size=0
+        key_preserve=0
+        key_storage_type=NONE
+        key_perms=0
+        key_requested_count=0
+        key_issued_count=0
+        cert_storage_type=FILE
+        cert_perms=0
+        cert_is_ca=0
+        cert_ca_path_length=0
+        cert_no_ocsp_check=0
+        last_need_notify_check=19700101000000
+        last_need_enroll_check=19700101000000
+        template_is_ca=0
+        template_ca_path_length=-1
+        template_no_ocsp_check=0
+        state=NEED_KEY_PAIR
+        autorenew=0
+        monitor=0
+        submitted=19700101000000
+        """)
+        # stop certmonger service
+        self.master.run_command(['systemctl', 'stop', 'certmonger'])
+
+        # place an empty cert request file to certmonger request dir
+        self.master.put_file_contents(
+            os.path.join(paths.CERTMONGER_REQUESTS_DIR, '20211125062617'),
+            empty_cert_req_content
+        )
+
+        # start certmonger, it should not fail
+        self.master.run_command(['systemctl', 'start', 'certmonger'])
+
+        # request a new cert, should succeed and certmonger doesn't goes
+        # to segfault
+        result = self.master.run_command([
+            "ipa-getcert", "request",
+            "-f", os.path.join(paths.OPENSSL_CERTS_DIR, "test.pem"),
+            "-k", os.path.join(paths.OPENSSL_PRIVATE_DIR, "test.key"),
+        ])
+        request_id = re.findall(r'\d+', result.stdout_text)
+
+        # check if certificate is in MONITORING state
+        status = tasks.wait_for_request(self.master, request_id[0], 50)
+        assert status == "MONITORING"
+
+        self.master.run_command(
+            ['ipa-getcert', 'stop-tracking', '-i', request_id[0]]
+        )
+        self.master.run_command([
+            'rm', '-rf',
+            os.path.join(paths.CERTMONGER_REQUESTS_DIR, '20211125062617'),
+            os.path.join(paths.OPENSSL_CERTS_DIR, 'test.pem'),
+            os.path.join(paths.OPENSSL_PRIVATE_DIR, 'test.key')
+        ])