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saml2aws Documentation for JumpCloud

Instructions for setting up single sign on (SSO) with Amazon AWS using JumpCloud and saml2aws.

JumpCloud Single Sign On (SSO) with Amazon AWS in IAM

Based on the instructions from JumpCloud, we'll setup administrative access for our production AWS account. We can then grant this access to our operations team. We will eventually want to setup administrative access for our other accounts (dev, test, staging, etc) as well as access for additional roles:

  • We may want to grant our accounts payable team the access they need to pay our AWS bill on each of our accounts
  • We may want to give our developers the ability to manage ec2 resources on our non-production accounts

Generate a public certificate and private key pair

Based on the instructions from JumpCloud, we'll generate a public certificate and private key pair for administrative access to our production AWS account.

Create production.cnf:

####################################################################
[ ca ]
default_ca      = CA_default

####################################################################
[ CA_default ]
default_days    = 1095

####################################################################
[ req ]
default_md             = SHA256
prompt                 = no
encrypt_key            = no
distinguished_name     = req_distinguished_name

[req_distinguished_name]
countryName             = "US"
stateOrProvinceName     = "New Jersey"
localityName            = "Fairfield"
organizationName        = "Acme Corporation"
organizationalUnitName  = "Acme Rocket-Powered Products, Inc."
commonName              = "production"

Create the key:

openssl genrsa -out production.key 2048

Create the certificate for the key:

openssl req -new -x509 \
  -key production.key \
  -out production.crt \
  -config production.cnf

Store the configuration file, the key, and the certificate someplace safe.

We currently use an encrypted team repository from Keybase to store our credentials and share them with the appropriate team.

Configure the new application in JumpCloud

As described in JumpCloud's documentation, add a new AWS application and configure it.

Suggestions:

  • Set https://aws.amazon.com/SAML/Attributes/SessionDuration to something that makes sense for your organization
  • We generally create a read-only role and a full role so that users can log into the read-only role most of the time and then log into the full role when they need to
  • IDP URL can't be changed once it's configured... Make sure it's a good and descriptive

Configure the new application in AWS

As described in JumpCloud's documentation, configure AWS to match what you did in JumpCloud.

Assign the new application to groups

Configure groups that should have access to the new application in JumpCloud.

AWS Management Console access

This is easy. Just log in as one of the users in the group(s) that have access to the new application. You'll see the new application when you log in, select it and you will be taken to AWS and logged in. If you configured multiple roles, you will be asked to choose which role to use.

AWS programmatic access

This assumes that you already have saml2aws installed.

Configure

Configure your application(s) with saml2aws. For example:

saml2aws configure \
  --idp-account='production' \
  --idp-provider='JumpCloud' \
  --mfa='Auto' \
  --url='https://sso.jumpcloud.com/saml2/acme-prod-aws-admin' \
  --username='[email protected]' \
  --role='arn:aws:iam::012345678987:role/AcmeJumpCloudAdminRO' \
  --skip-prompt

Here we used the IDP URL from above and we set the default role to be the read-only role that we suggested above.

This creates (or modifies) ${HOME}/.saml2aws. You can log in there and make any additional changes as needed.

There wasn't an option for configure to set the AWS profile so I edited ${HOME}/.saml2aws to setup the profile to point to production. This allows me to configure ${HOME}/.aws/config:

[default]
output = json
region = us-east-1

[profile production]
region = us-east-2

Login

Command:

saml2aws login -a production

Result:

Using IDP Account production to access JumpCloud https://sso.jumpcloud.com/saml2/acme-prod-aws-admin
To use saved password just hit enter.
? Username [email protected]
? Password **********************************

Authenticating as [email protected] ...
? MFA Token 987654
Selected role: arn:aws:iam::012345678987:role/AcmeJumpCloudAdminRO
Requesting AWS credentials using SAML assertion
Logged in as: arn:aws:iam::012345678987:role/AcmeJumpCloudAdminRO/[email protected]

Your new access key pair has been stored in the AWS configuration
Note that it will expire at 2019-01-30 16:29:35 -0700 MST
To use this credential, call the AWS CLI with the --profile option (e.g. aws --profile production ec2 describe-instances).

This creates a temporary credential in ${HOME}/.aws/credentials

Use

Traditional:

aws --profile production s3 ls

Using saml2aws exec:

saml2aws exec -a production -- aws s3 ls

saml2aws exec -a production -- terraform plan
saml2aws exec -a production -- terraform apply

saml2aws exec -a production -- env | grep AWS