[Bug 1973114] Re: Key trust verification fails on Ubuntu 22.04

Fri May 13 14:19:32 UTC 2022

I also tested with mssh to make it works well:

When running ec2-instance-connect 1.1.14-0ubuntu1 (from Jammy) and
trying to connect with mssh:

fabio at fabio-canonical:~/.aws$ mssh ubuntu at i-0af3232b4fb6ed642
ubuntu at 3.91.56.142: Permission denied (publickey).

Due to the bug, we can see the key being pushed, but then the client
denying the connection:

https://pastebin.ubuntu.com/p/7StqsfQdJp/

Back in the instance, I've changed the sources.list to point to kinetic
repos and upgraded ec2-instance-connect to kinetic's version:

ubuntu at ip-10-0-1-226:~$ sudo apt-cache policy ec2-instance-connect
ec2-instance-connect:
  Installed: 1.1.14-0ubuntu2
  Candidate: 1.1.14-0ubuntu2
  Version table:
 *** 1.1.14-0ubuntu2 500
        500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu kinetic/main amd64 Packages
        100 /var/lib/dpkg/status

And now mssh works fine:

fabio at fabio-canonical:~/.aws$ mssh ubuntu at i-0af3232b4fb6ed642
Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-1004-aws x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Fri May 13 14:16:20 UTC 2022

  System load:  0.2421875         Processes:             128
  Usage of /:   21.1% of 7.58GB   Users logged in:       1
  Memory usage: 1%                IPv4 address for eth0: 10.0.1.226
  Swap usage:   0%

74 updates can be applied immediately.
To see these additional updates run: apt list --upgradable

Last login: Fri May 13 13:47:05 2022 from 189.19.160.174
ubuntu at ip-10-0-1-226:~$

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https://bugs.launchpad.net/bugs/1973114

Title:
   Key trust verification fails on Ubuntu 22.04

Status in ec2-instance-connect package in Ubuntu:
  Fix Released
Status in ec2-instance-connect source package in Jammy:
  New

Bug description:
  [Impact]
  ========

  Can't get EC2 instance connect to work on Ubuntu 22.04 due to what
  seems to be an issue with trust chain verification. This is due to a
  change in OpenSSL 3.0.2.

  [Test Plan]
  ===========

  To reproduce:

  - Launch an EC2 instance with the current Ubuntu 22.04 AMI (e.g. ami-0aeb7c931a5a61206 in us-east-2).
  - Try to connect to it via mssh ubuntu@<instance-id>.
  - Observe that the command fails with "Permission denied (publickey)."

  When using the --debug flag with mssh, I see that the public key is
  pushed successfully, but the remote rejects the connection:

  ```
  ...
  2022-05-06 09:10:58,549 - EC2InstanceConnect - DEBUG - Successfully got instance information from EC2 API for <instance-id>
  ...
  2022-05-06 09:10:59,189 - EC2InstanceConnect - DEBUG - Successfully pushed the public key to <instance-id>
  2022-05-06 09:10:59,190 - EC2InstanceConnect - DEBUG - Generated command: ssh -o "IdentitiesOnly=yes" -i /var/folders/30/xdglsm2j3tz1rn1n7yygtm7c0000gn/T/tmp33a253uf ubuntu@<ip>
  ubuntu@<ip>: Permission denied (publickey).
  2022-05-06 09:10:59,612 - EC2InstanceConnect - DEBUG - Deleting the private key file: /var/folders/30/xdglsm2j3tz1rn1n7yygtm7c0000gn/T/tmp33a253uf
  ```

  On the instance side, the following error is logged:

  ```
  AuthorizedKeysCommand /usr/share/ec2-instance-connect/eic_run_authorized_keys ubuntu SHA256:wiFxouWj6qQ0aUZ0CAcftWZqNEf3qj2LLicCfGFcQJY failed, status 2
  ```

  [Where Problems Could Occur]
  ============================

  The package is broken for 22.04 so not a lot of things can go wrong
  there. However, if the user has done some manual workarounds, it could
  break that. But chances are less, IMO. \o/

  [Upstream Bug and Fix]
  ======================

  https://github.com/aws/aws-ec2-instance-connect-config/issues/38 
  https://github.com/aws/aws-ec2-instance-connect-config/pull/39

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