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AWS Assume Role script improvements #1

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AWS Assume Role script improvements #1

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45 changes: 32 additions & 13 deletions aws-cli-assumerole.sh
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Original file line number Diff line number Diff line change
@@ -1,28 +1,47 @@
#! /bin/bash
#
# Dependencies:
# brew install jq
# MacOS : brew install jq
# Linux (deb based) : apt install jq
#
# Setup:
# chmod +x ./aws-cli-assumerole.sh
#
# Execute:
# source ./aws-cli-assumerole.sh
# source ./aws-cli-assumerole.sh <AWS_ID> [<AWS_ROLE> [<SESSION_NAME>]]
#
# Description:
# Makes assuming an AWS IAM role (+ exporting new temp keys) easier

unset AWS_SESSION_TOKEN
export AWS_ACCESS_KEY_ID=<user_access_key>
export AWS_SECRET_ACCESS_KEY=<user_secret_key>
export AWS_REGION=eu-west-1
AWS_PROFILE="default"
AWS_ROLE="OrganizationAccountAccessRole"

temp_role=$(aws sts assume-role \
--role-arn "arn:aws:iam::<aws_account_number>:role/<role_name>" \
--role-session-name "<some_session_name>")
if [ $# -eq 0 ] || [ $# -gt 3 ]; then
echo "Usage : $0 <AWS_ID> [<AWS_ROLE> <SESSION_NAME>]"
else
if [ ! -z "$2" ]; then
AWS_ROLE=$2
fi
if [ ! -z "$3" ]; then
AWS_SESSION_NAME=$3
else
AWS_SESSION_NAME="Assume-$1"
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I'd like to assign $1 to a variable (e.g. AWS_ID) just for clarity, especially later where you reference $1 as part of the assume role line (it makes that line just a little bit clearer).

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Sure good idea 👍

I also thought that we should add a parameter to revert the credentials to the default AWS profile.

Looking forward to your improvements.

fi

export AWS_ACCESS_KEY_ID=$(echo $temp_role | jq .Credentials.AccessKeyId | xargs)
export AWS_SECRET_ACCESS_KEY=$(echo $temp_role | jq .Credentials.SecretAccessKey | xargs)
export AWS_SESSION_TOKEN=$(echo $temp_role | jq .Credentials.SessionToken | xargs)
unset AWS_SESSION_TOKEN
export AWS_ACCESS_KEY_ID=$(grep -A2 "\[$AWS_PROFILE\]" ~/.aws/credentials | awk -F"= " '/aws_access_key_id/ {print $2}')
export AWS_SECRET_ACCESS_KEY=$(grep -A2 "\[$AWS_PROFILE\]" ~/.aws/credentials | awk -F"= " '/aws_secret_access_key/ {print $2}')
export AWS_REGION=$(grep -A2 "\[$AWS_PROFILE\]" ~/.aws/config | awk -F"= " '/region/ {print $2}')
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the grep/awk flows are effectively the same, would it make sense to move the logic to a function and just pass in aws_access_key_id, aws_secret_access_key, region as the differentiator?

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Of course that would be cleaner.


env | grep -i AWS_
TEMP_ROLE=$(aws sts assume-role \
--role-arn "arn:aws:iam::$1:role/$AWS_ROLE" \
--role-session-name "$AWS_SESSION_NAME")

echo "Assumed ARN : $(echo $TEMP_ROLE | jq .AssumedRoleUser.Arn | xargs)"

export AWS_ACCESS_KEY_ID=$(echo $TEMP_ROLE | jq .Credentials.AccessKeyId | xargs)
export AWS_SECRET_ACCESS_KEY=$(echo $TEMP_ROLE | jq .Credentials.SecretAccessKey | xargs)
export AWS_SESSION_TOKEN=$(echo $TEMP_ROLE | jq .Credentials.SessionToken | xargs)

env | grep -i AWS_
fi