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  • Configuring CentOS to run SELinux in Strict Mode
    08/29/2011 5:05PM

    I am in the process of setting up some CentOS/RHEL 6 servers to run SELinux in strict mode.? What follows are notes, links to online resources and things that I am discovering along the way.? Once I am finished I will go back and re-write it to follow more of a how-to/guide type format.? In the meantime, it might seem a bit disjointed.

    Links/Resources:

    • http://wiki.centos.org/HowTos/SELinux
    • http://fedoraproject.org/wiki/SELinux
    • http://www.centos.org/docs/5/html/Deployment_Guide-en-US/rhlcommon-chapter-0001.html
    • http://www.nsa.gov/research/selinux/index.shtml

    MaintLog Notes:

    • Make sure that the selinux-policy-strict package (and deps) are installed:
    • # yum install selinux-policy-strict
    • After installing the policy I was unable to reboot as I hadn't relabeled the file system properly.? If having problems booting try:
    • # genhomedircon
    • # touch /.autorelabel
    • # reboot
    • After successfully booting with strict mode enabled you will not be able to do the things that you would normally expect as a root user.?This is because your root shell does not have access to the system administrator role.? To do so invoke the newrole command:
    • # newrole -r sysadmin_r
    • LEFTOFF: it seems semanage isn't installed.? I'll need to restart with selinux disabled to install it so that I can sort out running newrole properly:? see: http://www.spinics.net/lists/selinux/msg09681.html
    • Make sure that the semanage package is installed: # yum install libsemanage


  • Fixing Metadata file does not match checksum
    08/29/2011 4:38PM

    Sent to me by my friend, Wendy:

    When attempting to run a yum (search/install) if you get a the "Metadata file does not match checksum" error, try the following:

    # yum clean all

    # yum makecache

    # yum update

  • Random String Generator
    08/04/2011 4:21PM

    Very handy random string generator:

    http://www.random.org/strings/

  • Getting JavaScript CSS Dropdown Menu to Render Over a Flash Component
    07/29/2011 7:52PM

    If you are having trouble getting a DHTML drop-down menu to display on top of a Flash movie try adding the following to the <object> tag that embeds the .swf file in your .html.

    Add the following as a child to the <object> tag:

    <param name="wmode" value="transparent" />

    Add the following as an attribute to the <object> tag:

    wmode="transparent"

    I was having trouble getting a JavaScript dropdown to render over a Flash movie under IE and after adding the aforementioned tags it works just fine.

  • Compiling .jsp Fragments in Eclipse
    06/03/2011 12:55PM

    The ability to generate HTML or .JSP fragments that you can include on multiple pages of your site enables you to re-use code and increase maintainability.

    However, if you need to include functions (or methods) and fields (or variables) in one fragment that is included on a page and then utilize them in another fragment included in the same page Eclipse will give you compile errors because it concludes that your references are out of scope.

    The solution is quite simple:? Instead of naming the fragments .jsp, use some other extension (.jnc, .jinc, etc) for the fragements that contain references to variables or functions that are included on the parent page and use the <%@ include %> directive as this includes the content of the fragment at compile time.

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