Use the Vault AppRole pull model with response-wrapped secret_id delivery and a use-limit of one
domain: vaultproject.io · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Enable AppRole auth: 'vault auth enable approle'
Create a role with a single-use secret_id and short TTL: 'vault write auth/approle/role/myapp role_id=<CUSTOM_ROLE_ID> secret_id_num_uses=1 secret_id_ttl=10m token_ttl=1h token_policies=myapp-policy'
Generate a response-wrapped secret_id (the orchestrator never sees the raw value): 'vault write -wrap-ttl=120s -f auth/approle/role/myapp/secret-id'
Deliver the wrapping token to the application via a secure side channel (environment variable injection, instance metadata, etc.)
The application unwraps to obtain the secret_id: 'vault unwrap <WRAPPING_TOKEN>'
The application logs in: 'vault write auth/approle/login role_id=<ROLE_ID> secret_id=<SECRET_ID>' and caches the resulting Vault token, renewing it before expiry
Known gotchas
The wrapping token is single-use and time-limited; if it expires or is consumed by an attacker before the legitimate app, the app receives a 400 error — build retry/re-issue logic in the orchestrator
secret_id_num_uses=1 means the secret_id itself is single-use; a pod restart that tries to re-login will fail unless a new secret_id is generated
Vault does not verify that the client who unwraps the token is the intended recipient; the side-channel delivery must be the security control
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