Allow certificates to be defined by file path

[LuisGi93]

Hi team,
this PR aim to resolve #66. The options of the auth section in ossec.conf are used so the ossec-authd daemon is able to locate the CA, the manager certificate and its key. For the Wazuh agent the cert, key and CA are specified when calling agent-auth.

[LuisGi93]

Some example scenarios:

1. Verify the manager using ssl

• We have the manager.cert and manager.key at the /home/manager/ssl directory at our manager and the rootCA.pem at /home/manager/ folder . We can define the following manifest:

node "master-debian-1" {
   class { 'wazuh::server':
     smtp_server => 'localhost',
     ossec_auth_ssl_cert => "/home/manager/ssl/sslmanager.cert",
     ossec_auth_ssl_key => "/home/manager/ssl/sslmanager.key"
   }

}

This manifest will deploy a manager which ossec-auth will be using the /home/centos/ssl/sslmanager.cert and /home/centos/ssl/sslmanager.key. If we wanted to deploy an agent that verifies the deployed manager we can use the following manifest:

node "agent-debian-1" {

class { "wazuh::client":
  ossec_server_ip => "x.x.y.y",
  agent_name=> "agent-debian-1",
  wazuh_manager_root_ca_pem_path => "/home/agent/rootCA.pem"
}

}

The following test were done:

• Agent and manager are deployed successfully without enabling the specification of the certs and keys by path.
• Agent and manager are deployed successfully specifying the cert and key file for the manager and the CA for the agent.
• Ossec-authd it not launched if the cert or the key are wrong.
• If the wrong CA is especified when deploying the agent an error will happen at the registration phase.
• Debug was enable to verify the the agent_auth command.
• Ossec.conf was verified at the manager to verify that the correct settings were set.

2. Agent verification using SSL

Another scenario is when we want to verify agents using ssl. At this scenario we have the sslagent.cert and sslagent.key at /home/agent directory at the agent host and the rootCA.pem at the /home/manager directory at the manager host. An example manifest for the manager:

node "master-debian-1" {
   class { 'wazuh::server':
     smtp_server => 'localhost',
     ossec_auth_ssl_ca => "/home/manager/rootCA.pem"
   }

}

The above manifest will deploy a manager and will use the /home/manager/rootCA.pem file to verify the certs of the agents. An example manifest for the agent:

node "agent-debian-1" {

class { "wazuh::client":
  ossec_server_ip => "x.x.y.y.",
  agent_name=> "agente-debian-1",
  wazuh_agent_cert_path => "/home/agent/sslagent.cert",
  wazuh_agent_key_path => "//home/agent/sslagent.key"
}

}

The following test were done:

• Registration of the agent fail if an incorrect cert or key are provided.
• Agent registers correctly if the correct cert and key are provided.
• If the correct CA is specified for the manager the agent registration fail