AWS SSO Support does not work

I currently have SSO credentials using the command aws sso login, which work fine for aws cli (v2) commands, but mssh does not support using these credentials:

mssh i-02d6e842cb8375f64
Unable to locate credentials

mssh --profile nonprod i-02d6e842cb8375f64
Unable to locate credentials

aws --version
aws-cli/2.0.0 Python/3.7.4 Darwin/19.3.0 botocore/2.0.0dev4

[derektamsen]

AWS SSO credentials with a recent pip install ec2instanceconnectcli appears to be working.

Name: ec2instanceconnectcli
Version: 1.0.2
Summary: Command Line Interface for AWS EC2 Instance Connect
Home-page: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Connect-using-EC2-Instance-Connect.html
Author: Amazon Web Services
Author-email: UNKNOWN
License: Apache License 2.0
Location: /home/user/.local/lib/python3.9/site-packages
Requires: cryptography, botocore
Required-by: 

Reviewing the code it calls botocore.session.get_session() which means support for aws sso is based on whether the dependency botocore supports sso profiles. As of botocore 1.14.0, aws sso profiles are supported. I was able to successful use mssh to connect using aws sso with botocore 1.23.2.

Steps

1. pip install ec2instanceconnectcli
2. aws sso login --profile <your_sso_profile_config_name>
3. mssh --profile <your_sso_profile_config_name> --region <instance_region> <user>@<instance_id>

[z0mbix]

I ended up creating https://github.com/z0mbix/essh instead of using mssh. It supports AWS SSO from v0.0.5 onwards.