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Since AWS' RDS have a firewall based on EC2 security groups (or IP ranges), is it meaningful at all to also restrict connections' origins by restricting users?

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  • how did you go with this? do you need further help with this? Commented Aug 22, 2013 at 6:34
  • thanks @DrewKhoury, I think I'm going to follow the safest way and do both
    – Andres
    Commented Aug 29, 2013 at 0:36

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It's a good idea to do both.

While you might think,

I've secured the stack via AWS security groups, there's no point in doing it again at the application level.

...here are a few things to consider:

  • AWS might experience a bug or vulnerability which permits access where it shouldn't
  • You might accidentally remove or change a security group rule
  • You want broad rules at the security group level, but more specific rules per mysql user

You might consider restricting access at the mysql level overkill, and too much of a maintenance burden. At the end of the day it's up to you decide if the added security is worth the extra work.

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