Nessus is a very well known vulnerability scanner used by many large and small companies to assess their systems and correct the issues found in them. Cybersecurity teams and specially auditors, make heavy use of tools like this in order to follow up the state of infrastructure and environments. Having a tool like this saves […]
Nessus vulnerability scanner
A brief introduction to SSL/TLS certificates
SSL stands for Secure Sockets Layer and it an old implementation of a crytographic protocol. TLS, or Transport Layer Security, is a new one. They are both used to have privacy in the communications between different parties. They are used to secure email, web browsing, instant messaging, etc These protocols work in a complex way […]
How to set the locale in FreeBSD
The locale is the character set that will be used. And it is very important to match the keyboard you are using. Mind this also matters if you are transferring data to other systems. Different standards as the ASCII, UTF’s and the ISO’s, to name a few, have been put in place through the years […]
Nmap cheatsheet
Nmap is a discovery tool used in security circles but very useful for network administrators or sysadmins. One can get information about operating systems, open ports, running apps with quite good accuracy. It can even be used in substitution to vulnerability scanners such as Nessus or OpenVAS for not very large environments, or quick audits. […]
How to manually update Letsencrypt certificates on FreeBSD
Update 05-2020: If anyone is interested on the automatic process you can read my tutorial on DigitalOcean about the topic. On this guide we will manually update our Letsencrypt certificate on FreeBSD for a single website. It is a simple operation that can be automated as a cron job, but seeing it is always informative […]
How to mirror disks on FreeBSD’s ZFS
This article is not going to be a long, detailed, specialized how to. I just wanted to share the ease and the fantastic quality of ZFS for a dead simple need I had. A spare box with a spare disk doing nothing could be repurposed as a file share box at home. Mirroring the two […]
Reasonable amount of enabled modules on Apache HTTP
CentOS Ubuntu FreeBSD core_module (static) core_module (static) core_module (static) so_module (static) so_module (static) so_module (static) http_module (static) watchdog_module (static) http_module (static) access_compat_module (shared) http_module (static) mpm_prefork_module (shared) actions_module (shared) log_config_module (static) authn_file_module (shared) alias_module (shared) logio_module (static) authn_core_module (shared) allowmethods_module (shared) version_module (static) authz_host_module (shared) auth_basic_module (shared) unixd_module (static) authz_groupfile_module (shared) auth_digest_module (shared) access_compat_module (shared) […]
How to install sudo in FreeBSD
Sudo is a very useful application. It allows a regular user to perform tasks only reserved to the root account. There is lots of documentation about sudo and there is even a book about it called “Sudo Mastery”. If you need to investigate deep on this, buy it. Why do you need this? Well… Everyone […]
FreeBSD Jails
The FreeBSD jails is a virtualization technology you may have skipped for too long. It is an operating system level virtualization and is one of the differential characteristics of FreeBSD from Linux. Solaris took it to the main corporate use with Zones and as it couldn’t be any other way the Illumos folks also play […]
How to update FreeBSD using beadm
Beadm is a tool which provides a wonderful and distinctive functionality on Solaris, OpenIndiana and FreeBSD. It relies on the ZFS filesystem allowing to take a filesystem snapshot. That can be used to manage the so called boot environments which provide a great way to secure updates, even when everything goes down the tubes. Hence […]