I wrote another article recently about an issue when attempting to install the srvadmin-all RPM package provided by the Dell OMSA repository. It is likely that when you are installing the OMSA repository that you will receive an error on CentOS and possibly on other versions of Linux. The yum OMSA repository is installed via a file available from Dell called bootstrap.cgi. Below I describe the issue when installing the OMSA repository and provide a couple methods to resolve the problem.

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Every now and then you will probably install an application that has a certain amount of prerequisites that you should verify on your server before beginning installation. Today I needed to verify that PHP was compiled with curl and/or libcurl support to install an application on a CentOS Linux server. I also needed to verify that PHP safe_mode was set to off and PHP register_globals was also set to off. The easiest way to verify PHP settings is to create a temporary PHP file that calls the phpinfo function and displays the results on a web page. Use the information below to verify that PHP is compiled with curl support on CentOS Linux or any other Linux server.

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After moving a WordPress site from one server to a brand new server I ran into an issue with one of the WordPress plugins called MM-Forms. The MM-Forms WordPress plugin allows you to easily create contact forms that will either email filled out forms to you, store those forms in the MySQL database, or both email you and store the results in the database. The issue was the fact that the contact form was not displaying on the page it was configured to display on. After digging around a bit I located the issue by looking in the Apache logs. The issue ended up being with the PHP function called imagetypes. Below I describe the actual error noticed in the Apache logs, the CentOS RPM package that will provide the PHP function that was missing, and the yum logs from installing the package.

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When attempting to compile the CUDA Multiforcer on CentOS Linux I ran into an error because the argtable2 package was not installed on the server. The CUDA Multiforcer application is a security audit tool used to check the strength of MD4, MD5, NTLM, and SHA1 password hashes. The CUDA Multiforcer attempts to brute force one of those types of hashes by attempting every combination of characters specified such as lowercase only characters, lowercase characters and numbers, etc. This tool can be extremely beneficial for checking the strength of user passwords for various operating systems and/or applications that store their passwords in a MD4, MD5, NTLM, or SHA1 hash. As you can see in the below error the issue appears to be with argtable2 which is not a package available with the default yum repositories on CentOS. Below I display the error and describe what repository to install to be able to use yum to install the argtable2 RPM package.

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When building pyrit, which is an application that uses GPU power to run dictionary attacks against WPA handshake captures, on CentOS Linux I ran into an error. The error was related to the pcap.h library which was not found by the pyrit setup.py python script. Resolving the problem is easy by simply installing the libpcap-devel RPM package using the yum package manager. Below I display more output surrounding the error, the log showing the libpcap-devel package installation, and finally the successful build of pyrit on CentOS Linux.

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