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Note

On 2020-08-02, the Cornell Shibboleth IdP was updated to v4.01. That update broke the awscli-login package for use at Cornell. We are working on a fork of awscli-login that will fix that issue. Stand by for further info.

Thank you to user-af308 and Hong Ye for troubleshooting and identifying the problem!

 

Table of Contents

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Use Case

Excerpt

This document shows how to setup and use the awscli-login tool to retrieve temporary AWS access keys using your Cornell netid credentials and Duo (i.e., Cornell Two-Step Login). Using temporary access keys associated with an AWS role to authenticate to the AWS Command Line Interface (CLI) is much safer than using fixed AWS access keys tied to an IAM user. Now that this option is available to Cornell AWS users, we recommend that fixed access keys no longer be used for humans using the AWS CLI.

Prerequisites

Warning

The awscli-login tool does NOT work with AWS CLI version 2.x, however, AWS SSO does and is available now! Check out our docs and send us a ticket to request access to AWS SSO.


Info

We are told that awscli-login now works with Windows, though we don't yet have any Windows-specific instructions here. Let us know if you can provide some!

 


Code Block
languagetext
titleLinux/Mac OS
$ python --version
Python 2.7.14
$ python3 --version
-bash: python3: command not found
$ aws --version
aws-cli/1.15.83 Python/2.7.14 Linux/4.14.77-70.59.amzn1.x86_64 botocore/1.10.82

...


In the above example, Python 2.x is installed and the AWS CLI v1 is installed, but using Python 2.x. That's exactly what we don't want. It is beyond the current scope of this article to describe how to install Python 3.5+, and the AWS CLI, ensuring that the CLI is using your Python 3.5+ installation. Please note that virtualenv may make it easier to get the AWS CLI installed and using Python 3.5+.  

Install and Configure awscli-login

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Warning

Don't bother trying to install or use the awscli-login tool until  until your installed version of the AWS CLI v1 reports that it is using Python 3.5+. You will also need to ensure that pip is using Python 3.5+. That may mean you will need to use pip3 in the commands below, instead of plain pip.

...

Code Block
$ pip install --upgrade https://github.com/CU-CommunityApps/awscli-login/tarball/master#egg=awscli-login
...
$ aws configure set plugins.login awscli_login
...
$ aws login configure
ECP Endpoint URL [None]: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP
Username [None]: <YOUR NETID>
Enable Keyring [False]:
Duo Factor [None]:
Role ARN [None]:
$ 

You may ask...

Why is the Cornell fork version 0.1.0a5 while the "official" version at PyPi is version 0.1.0a6?

We're not sure. The master branch in the original git repo are labeled 0.1.0a5, so the master branch of our fork is too. We are looking into this, but our fork of version 0.1.0a5 seems to work.

Using awscli-login

Login using defaults setup above:

...

Note

The options for "Factor" are "push", "sms", "phone", "auto"

Advanced Use

 

Code Block
$ aws --profile foo login configure
ECP Endpoint URL [None]: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP
Username [None]: pea1
Enable Keyring [False]:
Duo Factor [None]: auto
Role ARN [None]: arn:aws:iam::111111111111:role/shib-admin

$ aws --profile bar login configure
ECP Endpoint URL [None]: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP
Username [None]: pea1
Enable Keyring [False]: 
Duo Factor [None]: auto
Role ARN [None]: arn:aws:iam::222222222222:role/shib-admin
 
$ aws --profile foo login
Password: **************
# Provided second factor out of band
$ aws --profile foo sts get-caller-identity
{
    "Arn": "arn:aws:sts::111111111111:assumed-role/shib-admin/pea1@cornell.edu",
    "Account": "111111111111",
    "UserId": "XXXXICCPMY7VALLFXXXX:pea1@cornell.edu"
}

 
$ aws --profile bar login
Password: **************
# Provided second factor out of band
$ aws --profile bar sts get-caller-identity
{
    "Arn": "arn:aws:sts::222222222222:assumed-role/shib-admin/pea1@cornell.edu",
    "Account": "222222222222",
    "UserId": "YYYYICCPMY7VALLFYYYY:pea1@cornell.edu"
}

 
 

Troubleshooting

Help! I got a 401 Client Error

Code Block
$ aws login
Password: **************
401 Client Error: Unauthorized for url: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP

...

Warning

If you have setup your awscli-login config to save your password (i.e., enable_keyring = true) then the plugin will happily save an incorrect password in the keyring. In this situation you will never be prompted for a password and you will immediately get a 401 error. To work through this edit your ~/.aws-login/config file to set enable_keyring = false, to be prompted for a password again.

...

Help! I got a 504 Server Error

Code Block
$ aws login
Password: **************
504 Server Error: GATEWAY_TIMEOUT for url: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP

This situation occurs when you fail to provide your Duo second factor in time.

 

Help! I got a 500 Server Error

Code Block
$ aws login
Password: 
Traceback (most recent call last):
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/__main__.py", line 175, in main
    profile.cookies,
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/saml.py", line 149, in refresh
    soap = saml_login(url, jar)
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/saml.py", line 92, in saml_login
    r.raise_for_status()
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/requests/models.py", line 941, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 401 Client Error: Unauthorized for url: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/__main__.py", line 123, in wrapper
    f(profile, session)
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/__main__.py", line 180, in main
    profile.cookies, *creds)
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/saml.py", line 118, in authenticate
    soap = saml_login(url, jar, username, password, headers)
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/awscli_login/saml.py", line 92, in saml_login
    r.raise_for_status()
  File "/home/ec2-user/environment/python37venv/lib/python3.7/site-packages/requests/models.py", line 941, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: 500 for url: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP
500 Server Error: 500 for url: https://shibidp.cit.cornell.edu/idp/profile/SAML2/SOAP/ECP

This situation occurs when you use the https://github.com/techservicesillinois/awscli-login (original) version of awscli-login instead of the Cornell for of that tool at https://github.com/CU-CommunityApps/awscli-login

To fix this, uninstall your current awscli-login version and use the Cornell fork:

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