Commits on Apr 22, 2023

1. [QT-530] enos: allow-list all public IP addresses …

   The security groups that allow access to remote machines in Enos
   scenarios have been configured to only allow port 22 (SSH) from the
   public IP address of machine executing the Enos scenario. To achieve
   this we previously utilized the `enos_environment.public_ip_address`
   attribute. Sometime in mid March we started seeing sporadic SSH i/o
   timeout errors when attempting to execute Enos resources against SSH
   transport targets. We've only ever seen this when communicating from
   Azure hosted runners to AWS hosted machines.
   
   While testing we were able to confirm that in some cases the public IP
   address resolved using DNS over UDP4 to Google and OpenDNS name servers
   did not match what was resolved when using the HTTPS/TCP IP address
   service hosted by AWS. The Enos data source was implemented in a way
   that we'd attempt resolution of a single name server and only attempt
   resolving from the next if previous name server could not get a result.
   We'd then allow-list that single IP address. That's a problem if we can
   resolve two different public IP addresses depending our endpoint address.
   
   This change utlizes the new `enos_environment.public_ip_addresses`
   attribute and subsequent behavior change. Now the data source will
   attempt to resolve our public IP address via name servers hosted by
   Google, OpenDNS, Cloudflare, and AWS. We then return a unique set of
   these IP addresses and allow-list all of them in our security group. It
   is our hope that this resolves these i/o timeout errors that seem like
   they're caused by the security group black-holing our attempted access
   because the IP we resolved does not match what we're actually exiting
   with.
   
   Signed-off-by: Ryan Cragun <me@ryan.ec>

   

   ryancragun committed Apr 22, 2023
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