Monthly Archives: May 2020

Linux, Security, Zabbix

Zabbix SELinux policy generation

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Commands to query the auditlog for Zabbix relevant queries and create/import a compiled policy file within Zabbix

Could be adapted to generate policies for any other system.

The suggestion is to set SELinux to permissive (setenforce=0) execute the action and afterwards create the policy based on the logged events. If the policy does not work on the first try after re-enabeling SELinux again it it could happen that a call was blocked (which is also logged within the auditlog) that was not blocked with SELinux in permissive mode. Therefore it could help creating a new human readable policy (.te-file) and checking the first version vs. the second version + merging them. 

filename=zabbix-server
cat /var/log/audit/audit.log  | grep zabbix | audit2allow -m $filename >> $filename.te
checkmodule -M -m -o $filename.mod $filename.te
semodule_package -o $filename.pp -m $filename.mod
semodule -i $filename.pp
 
 
#restorecon -R -v /run/zabbix/zabbix_server_alerter.sock    #suggested by the policygenerator
Ansible, Linux

Ansible handlers (within roles) – run multiple tasks

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Sometimes it could happen that we want to run multiple tasks after configuration file has changed instead of just one.

My specific usecase is, that I’m having a role that configures a SSL-certificate and additional SSL settings for an Apache webserver which could run standalone on a server or as a pacemaker resource.

If it is running directly on the server it’s quite simple and a handler is sufficient to restart the Apache service after the role ran through. In case the Apache is running as a pacemaker resource the resource should be restarted instead of the whole service to make sure pacemaker does not get confused. Therefore it is necessary to first check if we have the service running as a pacemaker resource first and execute the corresponding task afterwards so a single task (within our handler) is not sufficient.
Using the block statement will also not lead to success but fail with : ERROR! The requested handler 'Apply Apache Config' was not found in either the main handlers list nor in the listening handlers list

My approach to tackle this issue was to “missuse” the handler to only set a variable if something changed.
At the end of the role I’m checking if the variable is ture and if so, I’m including/executing my “handler-block”.

defaults/main.yml

common_linux_zabbix_server_web_ssl_path_private_apply_apache_config: no

handlers/main.yml

---
# handlers file for common_linux_zabbix_server_web_certificate

#set a fact which is checked at the end of the role-tasks
- name: "Apply Apache Config"
  set_fact:
    common_linux_zabbix_server_web_ssl_path_private_apply_apache_config: yes

tasks/main.yml

---
...
all your other tasks are executed before these following tasks
...


# workaround to run multiple tasks within a handler -> run the handlers if any of the above tasks did change something to notify the handler
- meta: flush_handlers

- name: "Run multiple tasks as a handler"
  include_tasks: ./restart_apache_resource_or_service.yml

tasks/restart_apache_resource_or_service.yml


---
- name: "Check if cluster resource exists"
  shell: "pcs resource | grep zbx_srv_httpd"
  ignore_errors: yes
  register: check

- name: "Restart cluster resource:"
  shell: "pcs resource restart zbx_srv_httpd"
  register: resource_restart
  when: check.rc == 0

- fail:
    msg: "An error occured when restarting the cluster resurce!"
  when: resource_restart.rc != 0

#Just restart the httpd service if no cluster resource was found
- name: "Restart httpd service"
  service:
    name: "httpd"
    state: restarted
  when: check.rc != 0[