mirror of https://github.com/kubernetes/kops.git
61 lines
2.3 KiB
Markdown
61 lines
2.3 KiB
Markdown
# kops & MFA
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You can secure `kops` with MFA by creating an AWS role & policy that requires MFA to access to the `KOPS_STATE_STORE` bucket. Unfortunately the Go AWS SDK does not transparently support assuming roles with required MFA. This may change in a future version. `kops` plans to support this behavior eventually. You can track progress in this [Github issue](https://github.com/kubernetes/kops/issues/226). If you'd like to ues MFA with `kops`, you'll need a work around until then.
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## The Workaround
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The work around uses `aws sts-assume role` in combination with an MFA prompt to retrieve temporary AWS access keys. This provides `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, and `AWS_SESSION_TOKEN` environment variables which are automatically picked up by Go AWS SDK. You provide the MFA & Role ARNs, then invoke `kops`.
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Here's an example wrapper script:
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```bash
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#!/usr/bin/env bash
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set -euo pipefail
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main() {
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local role_arn="${KOPS_MFA_ROLE_ARN:-}"
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local serial_number="${KOPS_MFA_ARN:-}"
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local token_code
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if [ -z "${KOPS_MFA_ROLE_ARN}" ]; then
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echo "Set the KOPS_MFA_ROLE_ARN environment variable" 1>&2
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return 1
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fi
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if [ -z "${KOPS_MFA_ARN}" ]; then
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echo "Set the KOPS_MFA_ARN environment variable" 1>&2
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return 1
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fi
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echo -n "Enter MFA Code: "
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read -s token_code
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# NOTE: The keys should not be exported as AWS_ACCESS_KEY_ID
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# or AWS_SECRET_ACCESS_KEY_ID. This will not work. They
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# should be exported as other names which can be used below. This prevents
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# them from incorrectly being picked up from libraries or commands.
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temporary_credentials="$(aws \
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sts assume-role \
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--role-arn="${role_arn}" \
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--serial-number="${serial_number}" \
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--token-code="${token_code}" \
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--role-session-name="kops-access"
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)"
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unset AWS_PROFILE
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export "AWS_ACCESS_KEY_ID=$(echo "${temporary_credentials}" | jq -re '.Credentials.AccessKeyId')"
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export "AWS_SECRET_ACCESS_KEY=$(echo "${temporary_credentials}" | jq -re '.Credentials.SecretAccessKey')"
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export "AWS_SESSION_TOKEN=$(echo "${temporary_credentials}" | jq -re '.Credentials.SessionToken')"
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exec kops "$@"
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}
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main "$@"
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```
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## Usage
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Download the script as `kops-mfa`, make it executable, put it on `$PATH`, set the `KOPS_MFA_ARN` and `KOPS_MFA_ROLE_ARN` environment variables. Run as `kops-mfa` followed by any `kops` command.
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