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add ability to assume role (#1) #7

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4 changes: 3 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,9 @@ A Concourse CI resource to check for new Amazon Machine Images (AMI).

- `aws_access_key_id`: Your AWS access key ID.

- `aws_secret_access_key`: Your AWS secret access key.
- `aws_secret_access_key`: Your AWS secret access key.

- `aws_role_arn`: ARN of a AWS IAM role to assume.

- `region`: *Required.* The AWS region to search for AMIs.

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14 changes: 14 additions & 0 deletions bin/check
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Expand Up @@ -9,6 +9,20 @@ AMI=$(jq -r '.version.ami // empty' /tmp/input)
export AWS_ACCESS_KEY_ID=$(jq -r '.source.aws_access_key_id // empty' /tmp/input)
export AWS_SECRET_ACCESS_KEY=$(jq -r '.source.aws_secret_access_key // empty' /tmp/input)
export AWS_DEFAULT_REGION=$(jq -r '.source.region // empty' /tmp/input)
export AWS_ROLE_ARN=$(jq -r '.source.aws_role_arn // empty' /tmp/input)

# if role arn has been provided, assume role
if ! [ -z "$AWS_ROLE_ARN" ]; then
aws sts assume-role \
--duration 900 \
--role-arn $AWS_ROLE_ARN \
--role-session-name ci \
--output json \
> /tmp/session
export AWS_ACCESS_KEY_ID=$(jq -r '.Credentials.AccessKeyId' /tmp/session)
export AWS_SECRET_ACCESS_KEY=$(jq -r '.Credentials.SecretAccessKey' /tmp/session)
export AWS_SESSION_TOKEN=$(jq -r '.Credentials.SessionToken' /tmp/session)
fi

# remove any empty credentials vars so the AWS client will try instance profiles
if [ -z "$AWS_ACCESS_KEY_ID" ]; then
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14 changes: 14 additions & 0 deletions bin/in
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Expand Up @@ -11,6 +11,20 @@ AMI=$(jq -r '.version.ami // empty' /tmp/input)
export AWS_ACCESS_KEY_ID=$(jq -r '.source.aws_access_key_id // empty' /tmp/input)
export AWS_SECRET_ACCESS_KEY=$(jq -r '.source.aws_secret_access_key // empty' /tmp/input)
export AWS_DEFAULT_REGION=$(jq -r '.source.region // empty' /tmp/input)
export AWS_ROLE_ARN=$(jq -r '.source.aws_role_arn // empty' /tmp/input)

# if role arn has been provided, assume role
if ! [ -z "$AWS_ROLE_ARN" ]; then
aws sts assume-role \
--duration 900 \
--role-arn $AWS_ROLE_ARN \
--role-session-name ci \
--output json \
> /tmp/session
export AWS_ACCESS_KEY_ID=$(jq -r '.Credentials.AccessKeyId' /tmp/session)
export AWS_SECRET_ACCESS_KEY=$(jq -r '.Credentials.SecretAccessKey' /tmp/session)
export AWS_SESSION_TOKEN=$(jq -r '.Credentials.SessionToken' /tmp/session)
fi

# remove any empty credentials vars so the AWS client will try instance profiles
if [ -z "$AWS_ACCESS_KEY_ID" ]; then
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