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Rowan Udell

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security groups

A collection of 4 posts

November 20, 2019

Don't use Tags to Manage Permissions in AWS

The main problem is this: By using tags for authorisation, you have a multitude of completely new - per-service - actions that can be used to compromise your security posture.

aws security groups iam architecture abac

November 16, 2017

Edge Bundling Security Groups Redux

You can now visualise your own EC2 security groups using edge bundling - No scripts, no downloads! This small web application takes an AWS access key id and secret access key to make requests against your AWS account. The application

aws security groups visualisation d3 ec2 cloudformation

May 13, 2016

Updating Security Groups with Lambda

Paying for idle is so 2015 I had some Lambda Functions that scraped data from the Internet, and stored them in a database. Locking-down the RDS Security Group to only Lambda Functions turned out to be more complicated than I

aws security groups lambda cloudfront vpc

April 3, 2016

Visualising EC2 Security Groups

Here's my first attempt at visualising AWS EC2 Security Groups in something other than a boring table: You can mouse over a SG name to see it's inbound (green) and outbound (red) connections to other groups/IP ranges. What is

aws ec2 visualisation security groups d3

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