WHMCS – can’t add new tld to domains

I found this odd issue with WHMCS billing platform. I wanted to add new tld to our domain pricing list, but when I clicked on Save Changes I’ll get notice that tld was added, but it wasn’t on domain list.

Just add/edit this in your php configuration – php.ini (default value is 1000):

max_input_vars = 5000

cPanel – create directory alias on domain

Creating aliases on cpanel server is easy – for domains. But when you want to create directory alias for files outside of document root, there is no quick/click option in control panel. By directory alias I mean for example, http://mydomain.com/something. Where /something is directory that is outside of your document root – public_html of domain. Another example, you have domain mydomain.com and you want phpmyadmin to be accessible on http://mydomain.com/phpmyadmin, but phpmyadmin is installed outside of document root of  mydomain.com. You’ll need directory alias. Here is quick way to do it.

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Directadmin – install Letsencrypt SSL certificate on server hostname

Letsencrypt is a revolutionary step forward on web security. Free, valid SSL certificates for everyone. I won’t write about how to install and config letsencrypt on Directadmin machine. I will show only how to generate and install letsencrypt certificate on your Directadmin hostname.

When you installed Letsencrypt on Directadmin and tried to install certificate for your server hostname, there is a possibility that you came to this problem: HTTP/1.1 400 Bad Request

Just do this:

cd /usr/local/directadmin/custombuild
./build update
./build letsencrypt

And than install certificate on your server hostname:

/usr/local/directadmin/scripts/letsencrypt.sh request my.serverhostname.com 4096

Open your Directadmin configuration file and change

SSL=0 to SSL=1

Also add this:

carootcert=/usr/local/directadmin/conf/carootcert.pem

Restart your Directadmin and you should be set.

PHP: SSL operation failed with code 1

If you installed PHP 5.6 or grater and your application returns something like this:

SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL...

Then there is a simple fix for that. You can override default OpenSSL’s CA bundle with the one bellow.

  1. Download this cert bundle.
  2. Add this line to your php.ini file
    openssl.cafile=/path/to/your/downloade/cacert.pem
  3. Restart apache/nginx and you should be ok.

check_eximailqueue: query returned no output! [FIX]

If you are icinga/nagios user and dealing with exim, you probably know for wonderful plugin check_eximailqueue. This plugin warns you when there are specific amount of email in your exim mail queue. Usually this indicates spam.

I installed this plugin on CentOS 7 with Directadmin installed. When I was executing plugin locally, it worked fine. But when I tried to execute it remotely (from Icinga server), it failed.

This was error returned when executing from Icinga server:

> # /usr/local/libexec/nagios/check_nrpe -H my.serverhostname.com -c check_exim_queue
Mailqueue WARNING - query returned no output!

I added “nagios  ALL=(ALL) NOPASSWD:/usr/sbin/exim” to my /etc/sudoers file but error still persisted. I manually set Exim and sudo path in script. Error was still there.

If you check your nrpe process, you’ll see that it runs by nrpe user and not nagios!

[root@da ~]# ps -aux | grep nrpe
 nrpe 26993 0.0 0.0 46356 1460 ? Ss 10:44 0:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d

Solution is very simple. Just change “nagios ALL=(ALL) NOPASSWD:/usr/sbin/exim”  to “nrpe ALL=(ALL) NOPASSWD:/usr/sbin/exim”  in your /etc/sudoers – replace user nagios with nrpe. It should work.

I hope it helps 🙂

Directadmin – block zip attachments with ClamAV and Exim

A lot of viruses and malware is sent in emails with zip attachments. Sometimes your antivirus like ClamAV wont catch nasty email. This is a big problem when you receiving tons of this kind of messages. So if you’re receiving tons of nasty emails containing zip attachments with viruses in it, good way to solve this is by simply reject emails with zip attachments. This was done on Directadmin server with Custombuild 2.0. Even if you’re not using Directadmin, configuration for ClamAV should be very identical.

  • If you built Exim and Clamav with Custombuild 2.0, than you should see this line in your /etc/exim.conf. Uncomment if it’s not already. If you’re using Custombuild 1.2, then this should be changed in /etc/exim.conf directly – settings in step 2 bellow.
    .include_if_exists /etc/exim.clamav.conf
  • Open file /etc/exim.clamav.conf and find word demime within that file. Then simply add zip to it. It should look like this:
    #1.0
    deny message = This message contains malformed MIME ($demime_reason)
    demime = *
    condition = ${if >{$demime_errorlevel}{2}{1}{0}}
    deny message = This message contains a virus or other harmful content ($malware_name)
    demime = *
    malware = *
    deny message = This message contains an attachment of a type which we do not accept (.$found_extension)
    demime = bat:com:pif:prf:scr:vbs:zip
    warn message = X-Antivirus-Scanner: Clean mail though you should still use an Antivirus

Now any email with zip attachment will be rejected. Sender will receive error message like this:

The error that the other server returned was: 
550 This message contains an attachment of a type which we do not accept (.zip)

Directadmin – enable and configure Spamassassin automatically on creating user

By default, when you add new user in Directadmin, Spamassassin is disabled. Some users are not aware about Spamassassin, so they’ll have it disabled and will receiving a lot of spam. It is good practice to enable Spamassassin by default and also set some settings. You can do that by adding below code in your /usr/local/directadmin/scripts/custom/user_create_post.sh script. The first step is well described on Directadmin documentation. But you may also want to define some parameters for Spamassassin when user is created. It’s really simple. You can do that by manipulating filter.conf file. Steps below are preformed on Directadmin running on FreeBSD. It should be the same for Linux also.

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Install PHP extension on Directadmin – fast and easy way (without custombuild)

Directadmin is pretty good, lightweight, control panel for providing web hosting service or to host your own websites/projects, managing mail … Through the years, I recompiled PHP with custombuild countless times. Problem is, that every time that you want to install some new PHP extension – exif, in this example – you’ll have to rebuild whole PHP with Directadmin’s custombuild also. That can be very annoying and time-consuming. Expesialy when things go wrong. So, there is simple way on how to quickly install PHP extensions without using custombuild. I used this way many times. In this case, installation was done on CentOS 7.2 server with Directadmin and PHP version 5.6.23.

I hope this was helpful to you in any way.

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Ultimate NGINX configuration for WordPress

Most of the sites that I created are based on WordPress. WordPress is great platform for your sites if you take a little care for it. different kind of abusive behavior on Wordpress systems is very common. Weak points are in most cases plugins, themes and outdated code in general. Many times people think, that security of their websites is all about hosting provider, firewalls… It’s true to some point. But one of the most fundamental steps to better WordPress security is up to the end-user. Take care of your site, update it regularly, use only good plugins and themes… It’s so important that you take care for regular updates and fixes. Also, try to use as least plugins as possible. If you are using only one theme, delete the ones that you don’t use. If you’ll  use theme downloaded from internet, only use themes from good providers.

NGINX in combination with good configuration and cache system can make your website lightning fast and super responsive. Memcached, Redis, Opcache are also great for optimizing your site. You definitely want to check into them too. W3 Total Cache plugin is great and easy to configure. More about this another time.

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fail2ban – Error in FilterPyinotify callback: illegal IP address string passed to inet_aton

Just recently, I discovered great pice of software named fail2ban. Supreme way to provide some additional security to your server. But more about fail2ban next time. So, I configured my jail.local configuration, but getting errors in error log. This was the error:

Error in FilterPyinotify callback: illegal IP address string passed to inet_aton

Error is pretty self explanatory, my whitelisted IP’s defined in variable ignoreip were wrong. If you use commas (,) like I did, then there is your problem. Just replace commas with spaces and it should work fine.

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