ipaclient: Defer creating the final krb5.conf on clients

A temporary krb5 configuration was used to join the domain in
ipaclient_join. After that the final krkb5 configuration was created
with enabled DNS discovery and used for the remainaing tasks, where also
a connection to the IPA API was done.

With several servers the DNS discovery could have picked up a different
server. If the client deployment was faster than the replication this
could have lead to an unknown host error.

The issue was seen in performance testing where many simultaneous client
enrollments have been done..

The goal is to keep server affinity as long as possible within the
deployment process:

The temporary krb5.conf that was used before in ipaclient_join was
pulled out into an own module. The generated temporary krb5.conf is now
used in ipaclient_join and also ipaclient_api.

The generation of the final krb5.conf is moved to the end of the
deployment process.

Same as: https://pagure.io/freeipa/issue/9228

The setup of certmonger has been pulled out of ipaclient_setup_nss and moved
to the end of the process after generating the final krb5.conf as it will
use t will only use /etc/krb5.conf.

Certificate issuance may fail during deployment due to using the final
krb5.conf, but certmonger will re-try the request in this case.

Same as: https://pagure.io/freeipa/issue/9246

roles/ipaclient/tasks/install.yml

@@ -239,12 +239,19 @@
       hostname: "{{ result_ipaclient_test.hostname }}"
     when: not ipaclient_on_master | bool
 
-  - name: Install - Join IPA
-    ipaclient_join:
+  - name: Install - Create temporary krb5 configuration
+    ipaclient_temp_krb5:
       servers: "{{ result_ipaclient_test.servers }}"
       domain: "{{ result_ipaclient_test.domain }}"
       realm: "{{ result_ipaclient_test.realm }}"
+      hostname: "{{ result_ipaclient_test.hostname }}"
       kdc: "{{ result_ipaclient_test.kdc }}"
+    register: result_ipaclient_temp_krb5
+
+  - name: Install - Join IPA
+    ipaclient_join:
+      servers: "{{ result_ipaclient_test.servers }}"
+      realm: "{{ result_ipaclient_test.realm }}"
       basedn: "{{ result_ipaclient_test.basedn }}"
       hostname: "{{ result_ipaclient_test.hostname }}"
       force_join: "{{ ipaclient_force_join | default(omit) }}"
@@ -255,6 +262,7 @@
       admin_keytab: "{{ ipaadmin_keytab if ipaadmin_keytab is defined and not ipaclient_use_otp | bool else omit }}"
       # ca_cert_file: "{{ ipaclient_ca_cert_file | default(omit) }}"
       kinit_attempts: "{{ ipaclient_kinit_attempts | default(omit) }}"
+      krb_name: "{{ result_ipaclient_temp_krb5.krb_name }}"
     register: result_ipaclient_join
     when: not ipaclient_on_master | bool and
           (not result_ipaclient_test_keytab.krb5_keytab_ok or
@@ -323,26 +331,13 @@
           "{{ ipassd_no_krb5_offline_passwords
               | default(ipasssd_no_krb5_offline_passwords) }}"
 
-    - name: Install - Configure krb5 for IPA realm
-      ipaclient_setup_krb5:
-        realm: "{{ result_ipaclient_test.realm }}"
-        domain: "{{ result_ipaclient_test.domain }}"
-        servers: "{{ result_ipaclient_test.servers }}"
-        kdc: "{{ result_ipaclient_test.kdc }}"
-        dnsok: "{{ result_ipaclient_test.dnsok }}"
-        client_domain: "{{ result_ipaclient_test.client_domain }}"
-        hostname: "{{ result_ipaclient_test.hostname }}"
-        sssd: "{{ result_ipaclient_test.sssd }}"
-        force: "{{ ipaclient_force }}"
-        # on_master: "{{ ipaclient_on_master }}"
-      when: not ipaclient_on_master | bool
-
     - name: Install - IPA API calls for remaining enrollment parts
       ipaclient_api:
         servers: "{{ result_ipaclient_test.servers }}"
         realm: "{{ result_ipaclient_test.realm }}"
         hostname: "{{ result_ipaclient_test.hostname }}"
         # debug: yes
+        krb_name: "{{ result_ipaclient_temp_krb5.krb_name }}"
       register: result_ipaclient_api
 
     - name: Install - Fix IPA ca
@@ -412,6 +407,36 @@
         domain: "{{ result_ipaclient_test.domain }}"
         nisdomain: "{{ ipaclient_nisdomain | default(omit) }}"
       when: not ipaclient_no_nisdomain | bool
+
+    - name: Remove temporary krb5.conf
+      ansible.builtin.file:
+        path: "{{ result_ipaclient_temp_krb5.krb_name }}"
+        state: absent
+      when: result_ipaclient_temp_krb5.krb_name is defined
+
+    - name: Install - Configure krb5 for IPA realm
+      ipaclient_setup_krb5:
+        realm: "{{ result_ipaclient_test.realm }}"
+        domain: "{{ result_ipaclient_test.domain }}"
+        servers: "{{ result_ipaclient_test.servers }}"
+        kdc: "{{ result_ipaclient_test.kdc }}"
+        dnsok: "{{ result_ipaclient_test.dnsok }}"
+        client_domain: "{{ result_ipaclient_test.client_domain }}"
+        hostname: "{{ result_ipaclient_test.hostname }}"
+        sssd: "{{ result_ipaclient_test.sssd }}"
+        force: "{{ ipaclient_force }}"
+        # on_master: "{{ ipaclient_on_master }}"
+      when: not ipaclient_on_master | bool
+
+    - name: Install - Configure certmonger
+      ipaclient_setup_certmonger:
+        realm: "{{ result_ipaclient_test.realm }}"
+        hostname: "{{ result_ipaclient_test.hostname }}"
+        subject_base: "{{ result_ipaclient_api.subject_base }}"
+        ca_enabled: "{{ result_ipaclient_api.ca_enabled }}"
+        request_cert: "{{ ipaclient_request_cert }}"
+      when: not ipaclient_on_master | bool
+
   always:
   - name: Install - Restore original admin password if overwritten by OTP
     no_log: yes
@@ -423,3 +448,15 @@
     ansible.builtin.file:
       path: "/etc/ipa/.dns_ccache"
       state: absent
+
+  - name: Remove temporary krb5.conf
+    ansible.builtin.file:
+      path: "{{ result_ipaclient_temp_krb5.krb_name }}"
+      state: absent
+    when: result_ipaclient_temp_krb5.krb_name is defined
+
+  - name: Remove temporary krb5.conf backup
+    ansible.builtin.file:
+      path: "{{ result_ipaclient_temp_krb5.krb_name }}.ipabkp"
+      state: absent
+    when: result_ipaclient_temp_krb5.krb_name is defined