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use IAM machine role instead of placing credentials on box #24

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use IAM machine role instead of placing credentials on box #24

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03282a4
Don't Repeat Yourself.
jsnshrmn Mar 20, 2017
2c8df85
Use IAM machine role.
jsnshrmn Mar 20, 2017
f59bd2b
Only export rolling credentials if the instance actually has a role.
jsnshrmn Mar 20, 2017
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15 changes: 13 additions & 2 deletions ebs-snapshot.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,20 @@ set -o pipefail

## Variable Declartions ##

# This URI is the same everywhere. Keep it DRY.
latest_metadata=http://169.254.169.254/latest/meta-data/

# Get Instance Details
instance_id=$(wget -q -O- http://169.254.169.254/latest/meta-data/instance-id)
region=$(wget -q -O- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/\([1-9]\).$/\1/g')
instance_id=$(wget -q -O- ${latest_metadata}instance-id)
region=$(wget -q -O- ${latest_metadata}placement/availability-zone | sed -e 's/\([1-9]\).$/\1/g')
iam_role=$(wget -q -O- ${latest_metadata}iam/security-credentials/)

# Export the rolling credentials for the iam role, if this instance has one.
if [ -n "$iam_role" ]; then
export AWS_ACCESS_KEY_ID=$(wget -q -O- ${latest_metadata}iam/security-credentials/${iam_role} | grep "AccessKeyId" | cut -d ":" -f 2 | tr "," " " | tr -d '"')
export AWS_SECRET_ACCESS_KEY=$(wget -q -O- ${latest_metadata}iam/security-credentials/${iam_role} | grep "SecretAccessKey" | cut -d ":" -f 2 | tr "," " " | tr -d '"')
export AWS_SECURITY_TOKEN=$(wget -q -O- ${latest_metadata}iam/security-credentials/${iam_role} | grep "Token" | cut -d ":" -f 2 | tr "," " " | tr -d '"')
fi

# Set Logging Options
logfile="/var/log/ebs-snapshot.log"
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