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    OpenSSL useful commands

    In this post, you will find below some useful usage of the OpenSSL tool. This commands can be used on both Linux and Windows environment. For the Windows OS, I have choosen to use the pre-compiled packages at conan.io (version

    shellandco_admin July 3, 2019 PKI, Security, Shell No Comments Read more

    Automatically install and renew Let’s Encrypt certificates

    Automatically install and renew Let’s Encrypt certificates The Electronic Frontier Foundation is the leading nonprofit organization defending civil liberties in the digital world. Founded in 1990, EFF champions user privacy, free expression, and innovation through impact litigation, policy analysis, grassroots

    shellandco_admin April 28, 2017 PKI, Python, Security, Web No Comments Read more

    WMIC command on Ubuntu 16.04 LTS

    I have written several months ago a post on how to install the wmic command on a linux system. Some additional steps are required now to get the wmic command on an Ubuntu 16.04 LTS server. Description Windows Management Instrumentation

    shellandco_admin January 19, 2017 Monitoring, Shell, Tips 24 Comments Read more

    Configure HKPK on Apache

    What is HKPK The Wikipedia explanation is the following: HTTP Public Key Pinning (HPKP),[1] sometimes incorrectly known as certificate pinning, is a security mechanism which allows HTTPS websites to resist impersonation by attackers using mis-issued or otherwise fraudulent certificates. For

    shellandco_admin January 16, 2017 PKI, Security, Web No Comments Read more

    Replace string in file with sed

    Some useful scenarios to use sed to replace string in file found here Replacing all occurrences of one string with another in all files in the current directory: These are for cases where you know that the directory contains only

    shellandco_admin January 6, 2017 Shell, Tips No Comments Read more

    Restrict a group’s rights to a specific command with sudo

    Wikipedia sudo is a program for Unix-like computer operating systems that allows users to run programs with the security privileges of another user, by default the superuser. It originally stood for “superuser do” as the older versions of sudo were

    shellandco_admin January 5, 2017 Process, Security, Shell No Comments Read more

    KVM virtualization using command line on Ubuntu 15.10

    Recently, I have tested the KVM hypervisor on a server running Ubuntu 15.10. The challenge, for me, was to install, configure and use the KVM host and guest only with the command line. First check, your server have to support

    shellandco_admin March 1, 2016 News, Python, Shell, Virtualization No Comments Read more

    Generate CSR for multiple domain names

    Generate CSR for multiple domain names Here is a simple tip to generate a CSR containing SAN (Subject Alternative Names) with OpenSSL in two line. The first step is to generate the private key: openssl genrsa -out your_private.key 4096 Subject

    shellandco_admin February 11, 2016 News, Security, Shell, Tips No Comments Read more

    Digitally sign your email on the MTA side

    Why sign your email directly on the MTA (here we will talk about Postfix MTA) ? I don’t find a simple webmail client for my email server that include a S/MIME and/or PGP functionality to sign/encrypt outgoing messages. So I

    shellandco_admin February 9, 2016 News, Project, Security, Shell 13 Comments Read more

    Linux Server monitoring dashboard

    eZ Server Monitor (eSM) is a lightweight and simple dashboard for Linux machine. Two versions are available : a web and a shell version. The features: System eZ Server Monitor Web – System In System block, the datas about the

    shellandco_admin January 28, 2016 Monitoring, News, PHP No Comments Read more
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