TechSNAP 82 Viewer Feedback – scottlinux | Thanks Chris and Allan,
How to Fetch DKIM Records from DNS | DKIM is simply a TXT record in DNS. A simple host command can fetch this record. I’ll show you how! The command is: $ host -t TXT dkimrecord So how do you find that dkim value? DKIM records are in the following format: [selector]._domainkey.[domain] The selector and domain are provided in the email headers of
Check key length from the command line with OpenSSL | To check the key length of a certificate, use the openssl command. Here is how to check an RSA private key length: $ openssl rsa -text -noout -in private.key The top of the output will have: Private-Key: (1024 bit) For a certificates (.crt or .pem), use this command: $ openssl x509 -text -noout -in certificate.crt
OpenVAS 0 byte pdf | Backtrack Linux | If OpenVAS is creating 0 byte PDF reports, you will need to install some extra latex packages. For Backtrack Linux, just install this one meta package to pull in all that is required: $ sudo apt-get install texlive-latex-extra Done! Here is an example PDF.
fping for ICMP Discovery and Monitoring | fping is an ICMP command line utility to verify ICMP reponses from any number of targets. fping is a better choice than ping for scripting tasks as it is able to check a list or range of IP addresses in numerical order to discover ICMP response. I’ll show you some basic info on using fping!
useradd: cannot lock /etc/passwd; try again later. | Can’t add a user in Linux because of this: ‘useradd: cannot lock /etc/passwd; try again later.’ ? Here’s what to check! $ sudo useradd -m -g users -s /bin/bash jsmith useradd: cannot lock /etc/passwd; try again later. If you receive this message even when running with sudo, there are small lock files that are causing
Online regex checker | If you ever needed to validate regular expressions, this site is invaluable. http://regexpal.com This site has really saved my bacon more than once. Check it out!
Install BIND in Red Hat 6 or CentOS 6 | As of Red Hat 6 and CentOS 6, the DNS server bind is super easy to get up and running. Here’s how it works! Install bind: $ sudo yum install bind Start bind – the service is called named $ sudo /etc/init.d/named start Generating /etc/rndc.key: [ OK ] Starting named: [ OK ] Done. If
Drupal Security Notes | Check out this article on Drupal Security: Drupal Security Notes If you find this topic interesting, you may also be interested in Expert Pen Testing or CISSP training. Cool!
Enable or Disable Compression in Apache | I’ll show you a quick way to actively check a server for compression as well as how to disable compression in Apache. Note: This has _no_ effect on the CRIME TLS vulnerability. Test for Compression A simple test page to test for HTTP compression is here: http://www.gidnetwork.com/tools/gzip-test.php Or alternatively, below is a manual test for