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Script to log into AWS with a SAML assertion. Must replace ACCOUNT number etc. before use!
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#!/bin/bash | |
# Copyright 2024 Lionello Lunesu | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy of | |
# this software and associated documentation files (the “Software”), to deal in the | |
# Software without restriction, including without limitation the rights to use, copy, | |
# modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
# and to permit persons to whom the Software is furnished to do so, subject to | |
# the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in all | |
# copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, | |
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
# OTHER DEALINGS IN THE SOFTWARE. | |
set -e | |
TOKEN=$1 | |
if [ -z "$TOKEN" ]; then | |
echo "Paste SAML assertion:" | |
read TOKEN # NOTE: limited by LINE_MAX | |
fi | |
#### UPDATE THESE TO MATCH YOUR CONFIGURATION #### | |
ACCOUNT=124356789012 | |
ROLE_ARN=arn:aws:iam::$ACCOUNT:role/CHANGME | |
PRINCIPAL_ARN=arn:aws:iam::$ACCOUNT:saml-provider/CHANGME | |
SAML_PROFILE=saml | |
JSON=$(aws sts assume-role-with-saml --role-arn $ROLE_ARN --principal-arn $PRINCIPAL_ARN --saml-assertion "$TOKEN") | |
AccessKeyId=$(echo "$JSON" | jq -r .Credentials.AccessKeyId) | |
SecretAccessKey=$(echo "$JSON" | jq -r .Credentials.SecretAccessKey) | |
SessionToken=$(echo "$JSON" | jq -r .Credentials.SessionToken) | |
Expiration=$(echo "$JSON" | jq -r .Credentials.Expiration) | |
AssumedRoleUser=$(echo "$JSON" | jq -r .AssumedRoleUser.Arn) | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^aws_access_key_id .*|aws_access_key_id = $AccessKeyId|" ~/.aws/credentials | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^aws_secret_access_key .*|aws_secret_access_key = $SecretAccessKey|" ~/.aws/credentials | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^aws_session_token .*|aws_session_token = $SessionToken|" ~/.aws/credentials | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^aws_security_token .*|aws_security_token = $SessionToken|" ~/.aws/credentials | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^x_principal_arn .*|x_principal_arn = $AssumedRoleUser|" ~/.aws/credentials | |
sed -ibk "/^\[$SAML_PROFILE\]/,/^\[/ s|^x_security_token_expires .*|x_security_token_expires = $Expiration|" ~/.aws/credentials | |
AWS_PROFILE=$SAML_PROFILE aws sts get-caller-identity |
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