[ssh_known_hosts] Use LDAP to deploy ssh_known_hosts

lookup_plugins/ldap.py

@@ -104,6 +104,23 @@ class LookupModule(LookupBase):
                 result.append(cn.decode('utf-8'))
         return result
 
+    def ssh_keys(self, host):
+        """
+        Retrieve SSH keys of a host
+        query('ldap', 'ssh_keys', HOST)
+        """
+        host_query_id = self.base.search(f"cn={host},ou=hosts,{self.base_dn}", ldap.SCOPE_BASE)
+        host_result = self.base.result(host_query_id)[1][0][1]
+        result = []
+        if 'description' not in host_result:
+            return result
+        for description in host_result['description']:
+            description = description.decode('utf-8')
+            key, value = description.split(':', 1)
+            if key in {'ecdsa-sha2-nistp256', 'ssh-ed25519', 'ssh-dss', 'ssh-rsa'}:
+                result.append(f'{key} {value}')
+        return result
+
     def subnet_ipv4(self, subnet):
         """
         Retrieve used IP addresses on a subnet
@@ -132,6 +149,8 @@ class LookupModule(LookupBase):
             result = self.all_cn(*terms[1:])
         elif terms[0] == 'subnet_ipv4':
             result = self.subnet_ipv4(*terms[1:])
+        elif terms[0] == 'ssh_keys':
+            result = self.ssh_keys(*terms[1:])
         elif terms[0] == 'group':
             query_id = self.base.search(f"ou=group,{self.base_dn}", ldap.SCOPE_SUBTREE, "objectClass=posixGroup")
             result = self.base.result(query_id)

roles/ssh_known_hosts/templates/ssh/ssh_known_hosts.j2

-{% for host in groups["server"] | sort %}
-{% for keytype in ['ecdsa', 'rsa', 'ed25519'] %}
-{% if 'ssh_host_key_{}_public'.format(keytype) in hostvars[host]['ansible_facts'].keys() %}
-{{ query('ldap', 'all_cn', hostvars[host]['ansible_facts']['hostname']) | join(',') }},{{ query('ldap', 'all_ip', hostvars[host]['ansible_facts']['hostname']) | join(',') }} ssh-{{ keytype }} {{ hostvars[host]['ansible_facts']['ssh_host_key_{}_public'.format(keytype)] }} root@{{ hostvars[host]['ansible_facts']['hostname'] }}
-{% endif %}
+{{ ansible_header | comment }}
+{% set hosts = query('ldap', 'query', 'ou=hosts,dc=crans,dc=org', 'one', 'objectClass=device') %}
+{% for host, device in hosts.items() | sort(attribute='0') %}
+{% set cns = query('ldap', 'all_cn', hosts[host].cn[0]) | sort %}
+{% set ips = query('ldap', 'all_ip', hosts[host].cn[0]) | sort %}
+{% for key in query('ldap', 'ssh_keys', hosts[host].cn[0]) | sort %}
+{{ cns | join(',') }},{{ ips | join(',') }} {{ key }} root@{{ hosts[host].cn[0] }}
 {% endfor %}
 {% endfor %}