OPA for HTTP Authorization

Open Policy Agent[1] is a promising, light weight and very generic policy engine to govern authorization is any type of domain. I found this comparion[2] very attractive in evaluating OPA for a project I am currently working on, where they demonstrate how OPA can cater same functionality defined in RBAC, RBAC with Seperation of Duty, ABAC and XACML.  
Here are the steps to a brief demonstration of OPA used for HTTP API authorization based on the sample [3], taking it another level up.
Running OPA Server First we need to download OPA from [4], based on the operating system we are running on.  For linux, curl -L -o opa https://github.com/open-policy-agent/opa/releases/download/v0.10.3/opa_linux_amd64 Make it executable, chmod 755 ./opa Once done, we can start OPA policy engine as a server.
./opa run --server Define Data and Rules Next we need to load data and authorization rules to the server, so it can make decisions. OPA defines these in files in the format of .rego. Below is a sample …

How to Install Windows in a Virtual Machine in Linux(Ubuntu)

Recently I wanted to run Windows inside my Primary OS -  Ubuntu 12.04. I didn't want to go for dual boot option so I decided to use a virtual machine and install Windows inside Ubuntu. I faced couple of problems and here share my experience with how I overcame them.

In choosing a Virtual machine I tried out 2 options. Oracle VM VirtualBox and VMware Player that is available in Ubuntu Software Centre. I could create a virtual machine successfully hitting 'new' button and following the wizard. Then I started the created machine, pointing to the CD image. It tried to load Windows files and then printed the following error on screen.

Attempting to load a 64-bit application, This CPU is not compatible with 64-bit mode.

But my machine has a 64 bit processor. So something has gone wrong. The issue has been my BIOS settings in the host machine has not enabled hardware virtualization. So I manually did it. My machine was a Lenovo ThinkPad T530 and could find this setting under security tab of BIOS as virtualization. So I enabled it there and tried again. This error was fixed.

So I moved forward with VirtualBox. Oh here came another one.

Error status 0xc0000225

This was simpler to fix. Just went to,
VirtualBox>Settings>System>Motherboard and under Extended Features, ticked 'Enable IO APIC'. This has enabled Advanced Programmable Interrupt Controllers which has been requirement for Windows installation.

Cheers, now it is installed!
 






Comments

  1. Hi there! glad to drop by your page and found these very interesting and informative stuff. Thanks for sharing, keep it up!

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