Support validating LWCA certmonger requests

The LWCA ids are UUID4 format and are stored in LDAP so
we can retrieve the list (ignoring the ipa entry) and
construct what the request should look like.

Add a cache for the get_expected_requests() function. The
certificates aren't going to change (or shouldn't) in the
middle of a run and there is no point in duplicating several
LDAP requests for each call.

Fixes: freeipa#307

Signed-off-by: Rob Crittenden <rcritten@redhat.com>

src/ipahealthcheck/ipa/certs.py

@@ -35,6 +35,8 @@
 logger = logging.getLogger()
 DAY = 60 * 60 * 24
 
+expected_requests = []  # to cache the expected certmonger requests
+
 
 def is_ipa_issued_cert(myapi, cert):
     """Thin wrapper around certs.is_ipa_issued to test for LDAP"""
@@ -44,7 +46,7 @@ def is_ipa_issued_cert(myapi, cert):
     return certs.is_ipa_issued_cert(myapi, cert)
 
 
-def get_expected_requests(ca, ds, serverid):
+def get_expected_requests(ca, ds, serverid, conn):
     """Provide the expected certmonger tracking request data
 
        This list is based in part on certificate_renewal_update() in
@@ -54,10 +56,15 @@ def get_expected_requests(ca, ds, serverid):
        The list is filtered depending on whether a CA is running
        and the certificates have been issued by IPA.
 
-      :param ca: the CAInstance
-      :param ds: the DSInstance
-      :param serverid: the DS serverid name
+       :param ca: the CAInstance
+       :param ds: the DSInstance
+       :param serverid: the DS serverid name
     """
+    global expected_requests
+
+    if expected_requests:
+        return expected_requests
+
     template = paths.CERTMONGER_COMMAND_TEMPLATE
 
     if api.Command.ca_is_enabled()['result']:
@@ -100,6 +107,7 @@ def get_expected_requests(ca, ds, serverid):
             if token and token != 'internal':
                 req['key-token'] = token
             requests.append(req)
+        requests.extend(get_lwca_requests(conn))
     else:
         logger.debug('CA is not configured, skipping CA tracking')
 
@@ -174,9 +182,49 @@ def get_expected_requests(ca, ds, serverid):
                 }
             )
 
+    expected_requests = requests
+
     return requests
 
 
+def get_lwca_requests(conn):
+    """
+    Retrieve the known LWCA certificates.
+    """
+    lwca_requests = []
+    try:
+        entries, truncated = conn.find_entries(
+            base_dn=DN(api.env.container_ca, api.env.basedn),
+            filter="(&(objectclass=ipaca)(!(cn=ipa)))",
+        )
+    except (errors.EmptyResult, errors.NotFound) as e:
+        logger.warn("Search for LWCA entries failed: %s", e)
+        return lwca_requests
+
+    template = paths.CERTMONGER_COMMAND_TEMPLATE
+    for entry in entries:
+        try:
+            id = entry.get('ipacaid')[0]
+        except Exception as e:
+            logger.debug("Malformed LDAP entry, unable to get LWCA id %s: %s",
+                         entry.get('dn'), e)
+            continue
+        nickname = f'caSigningCert cert-pki-ca {id}'
+
+        req = {
+            'cert-database': paths.PKI_TOMCAT_ALIAS_DIR,
+            'cert-nickname': nickname,
+            'ca-name': RENEWAL_CA_NAME,
+            'cert-presave-command': template % 'stop_pkicad',
+            'cert-postsave-command':
+                (template % 'renew_ca_cert "{}"'.format(nickname)),
+            'template-profile': 'caCACert',
+        }
+        lwca_requests.append(req)
+
+    return lwca_requests
+
+
 def expected_token(token_name, certmonger_token):
     """The value is stored in two places, do some sanity checking"""
     if token_name != certmonger_token:
@@ -426,7 +474,8 @@ class IPACertTracking(IPAPlugin):
 
     @duration
     def check(self):
-        requests = get_expected_requests(self.ca, self.ds, self.serverid)
+        requests = get_expected_requests(self.ca, self.ds, self.serverid,
+                                         self.conn)
         cm = certmonger._certmonger()
 
         ids = []
@@ -495,7 +544,8 @@ class IPACertDNSSAN(IPAPlugin):
     @duration
     def check(self):
         fqdn = socket.getfqdn()
-        requests = get_expected_requests(self.ca, self.ds, self.serverid)
+        requests = get_expected_requests(self.ca, self.ds, self.serverid,
+                                         self.conn)
 
         for request in requests:
             request_id = certmonger.get_request_id(request)
@@ -1225,7 +1275,8 @@ def check(self):
         if not self.ca.is_configured():
             logger.debug('CA is not configured, skipping revocation check')
             return
-        requests = get_expected_requests(self.ca, self.ds, self.serverid)
+        requests = get_expected_requests(self.ca, self.ds, self.serverid,
+                                         self.conn)
         pwd_file = get_token_password_file(self.ca.hsm_enabled,
                                            self.ca.token_name)
         for request in requests: