Fixed DNS validation in the Installation Assistant

[davidcr01]

Related issue
#2350

Description

The aim of this PR is to improve the regex to validate the DNS specified in the Wazuh cert tool, also used by the Installation Assistant.
Besides, a new improvement has been added to check the private IPs only if they are IPs.

Logs example

Using valid DNS

config.yml:

nodes:
  # Wazuh indexer nodes
  indexer:
    - name: node-1
      ip: www.google.es
    #- name: node-2
    #  ip: <indexer-node-ip>
    #- name: node-3d
    #  ip: <indexer-node-ip>

  # Wazuh server nodes
  # If there is more than one Wazuh server
  # node, each one must have a node_type
  server:
    - name: wazuh-1
      ip: foo.bar1.com

Output:

24/08/2023 09:40:13 DEBUG: Creating the Wazuh indexer certificates.
Ignoring -days without -x509; not generating a certificate
.....+...+..................+.....+.........+.+.....................+........+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..+..+....+..+...+......+....+..+....+...+..+...+.+..+.......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..+...+.......+...+..+.......+.....+.......+........+.......+...+..+...+.+.....+.+........+...+...+............+....+...+..+.+...+..+.........+..........+...+.....+......+...................+..+................+..+.+..+....+...+..+.+..................+.........+..+...+.+....................+.+...........+...+.+...+.....+.+......+.....+.+.....+.......+...+..+..........+...+...+.....+....+...+.....+.........+......+....+.........+.........+.....+.+...........+.........+.......+.......................+.........+............................+.....+...+.......+..+.+.....+.+.....+..................+.......+...+..+......+...+....+..+......+.............+.........+........+....+...+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
..+...+....+...........+....+......+..+............+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*........+...+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..........+............+...+.....+.........+...+.+.........+...........+....+...........+.+........+...+...+....+...+........+....+......+..+.......+...+..............+.........+.+......+.....+.......+..................+..+.+.....+......+.+............+......+..+.......+......+..+....+...........+...+.........+...+....+...+...+..+.+......+.....+.+..+..................+...+.+......+...+.....+...................+.....+.......+......+..+.+..+....+......+..............+...+..........+...+..+............+.+.....+...+....+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----
Certificate request self-signature ok
subject=C = US, L = California, O = Wazuh, OU = Wazuh, CN = node-1
24/08/2023 09:40:13 DEBUG: Creating the Wazuh server certificates.
Ignoring -days without -x509; not generating a certificate
........+..+..........+..+.+..+....+........+...+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.........+.....+......+.+..+.......+...+.....+.......+........+.+..+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.+.+...+..+..........+........+............+..........+..+.+......+...+.....+.+.....+....+.....+...+...+..............................+.+...........+....+......+..............+.+...+.........+...........+....+...+..+......+......+...+.+......+.........+......+.....+.+........+..........+.........+..+.+..+.+.........+............+...+...+...+......+..............+.+..............+.+......+..+..........+..+.+........+......+.+..+.+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
..+.......+..+.........+...............+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.+......+.....................+.+............+.....+...+.........+.+........+......+....+..+.............+...............+...........+.........+.+........+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*........+..+...+................+...+...............+.....+.......+......+...+............+.....+.......+...+.....+.......+..+.+...+.........+.....+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----
Certificate request self-signature ok
subject=C = US, L = California, O = Wazuh, OU = Wazuh, CN = wazuh-1

Using invalid DNS

config.yml:

nodes:
  # Wazuh indexer nodes
  indexer:
    - name: node-1
      ip: localhost

Output:

24/08/2023 09:44:00 DEBUG: Creating the Wazuh indexer certificates.
24/08/2023 09:44:00 ERROR: Invalid IP or DNS localhost

config.yml:

nodes:
  # Wazuh indexer nodes
  indexer:
    - name: node-1
      ip: localhost.123

Output:

24/08/2023 09:44:00 DEBUG: Creating the Wazuh indexer certificates.
24/08/2023 09:44:00 ERROR: Invalid IP or DNS localhost.123

Using valid IP address

config.yml:

nodes:
  # Wazuh indexer nodes
  indexer:
    - name: node-1
      ip: 127.0.0.1

Output:

24/08/2023 09:45:42 DEBUG: Creating the Wazuh indexer certificates.
Ignoring -days without -x509; not generating a certificate
....+.........+.+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.....+.........+..............+....+..+......+............+...+.......+...+..+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..+.........+...........................+.........+......+.....+......+...+...................+...+.....+...+....+...+..+..................+...+.+...+...+..+...+.......+......+......+......+..+......+......+...................+...........+.+.....+....+...+........+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.+...+.+...............+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.........+..+............+.+...+...........+....+..+.......+.....+.......+...............+.........+.....+..........+.........+..+.+.....+.........+......+...+.......+..+.+...........+......+............+.+......+......+...+.....+.........+.+.....+.+.....+......+.......+..+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----
Certificate request self-signature ok
subject=C = US, L = California, O = Wazuh, OU = Wazuh, CN = node-1

Using invalid IP address (public)

config.yml:

nodes:
  # Wazuh indexer nodes
  indexer:
    - name: node-1
      ip: 82.129.80.111

Output:

24/08/2023 09:47:20 INFO: --- Configuration files ---
24/08/2023 09:47:20 INFO: Generating configuration files.
24/08/2023 09:47:20 ERROR: The IP 82.129.80.111 is public.

[c-bordon]

LGTM