An application has authenticated to Vault and has obtained dynamic database credentials with a lease of 4 hours. Four hours later, the credentials expire, and the application can no longer communicate with the backend database, so the application goes down. What should the developers instruct the application to do to prevent this from happening again while maintaining the same level of security?
Comprehensive and Detailed in Depth
To prevent application downtime due to expired dynamic credentials while maintaining security, the application should renew the lease before it expires. The HashiCorp Vault documentation states: 'The application should frequently 'check-in' with Vault and renew the lease to prevent the lease from expiring.' It adds: 'A lease must be renewed before it has expired. Once it has expired, it is permanently revoked and a new secret must be requested.'
The docs elaborate: 'Dynamic secrets are designed to be short-lived and automatically rotated or revoked when their lease expires. Renewing the lease extends its validity, ensuring continuous access without compromising the security benefits of short-lived credentials.' A (Static credentials) reduces security by eliminating rotation. C (Revoke) ends access early. D (Different auth method) doesn't address lease management. Thus, B is correct.
HashiCorp Vault Documentation - Leases: Lease Renew and Revoke
Where does the Vault Agent store its cache?
The Vault Agent stores its cache in memory, which means that it does not persist the cached tokens and secrets to disk or any other storage backend. This makes the cache more secure and performant, as it avoids exposing the sensitive data to potential attackers or unauthorized access. However, this also means that the cache is volatile and will be lost if the agent process is terminated or restarted. To mitigate this, the agent can optionally use a persistent cache file to restore the tokens and leases from a previous agent process. The persistent cache file is encrypted using a key derived from the agent's auto-auth token and a nonce, and it is stored in a user-specified location on disk. Reference: Caching - Vault Agent | Vault | HashiCorp Developer, Vault Agent Persistent Caching | Vault | HashiCorp Developer
Your organization has an initiative to reduce and ultimately remove the use of long lived X.509 certificates. Which secrets engine will best support this use case?
The PKI secrets engine is designed to support the use case of reducing and ultimately removing the use of long lived X.509 certificates. The PKI secrets engine can generate dynamic X.509 certificates on demand, with short time-to-live (TTL) and automatic revocation. This eliminates the need for manual processes of generating, signing, and rotating certificates, and reduces the risk of certificate compromise or misuse. The PKI secrets engine can also act as a certificate authority (CA) or an intermediate CA, and can integrate with external CAs or CRLs. The PKI secrets engine can issue certificates for various purposes, such as TLS, SSH, code signing, email encryption, etc. Reference: https://developer.hashicorp.com/vault/docs/secrets/pki1, https://developer.hashicorp.com/vault/tutorials/getting-started/getting-started-dynamic-secrets
When unsealing Vault, each Shamir unseal key should be entered:
When unsealing Vault, each Shamir unseal key should be entered by different administrators each connecting from different computers. This is because the Shamir unseal keys are split into shares that are distributed to trusted operators, and no single operator should have access to more than one share. This way, the unseal process requires the cooperation of a quorum of key holders, and enhances the security and availability of Vault. The unseal keys can be entered via multiple mechanisms from multiple client machines, and the process is stateful. The order of the keys does not matter, as long as the threshold number of keys is reached. The unseal keys should not be entered at the command line in one single command, as this would expose them to the history and compromise the security. The unseal keys should not be encrypted with each administrator's PGP key, as this would prevent Vault from decrypting them and reconstructing the master key. Reference: https://developer.hashicorp.com/vault/docs/concepts/seal3, https://developer.hashicorp.com/vault/docs/commands/operator/unseal
As a best practice, the root token should be stored in which of the following ways?
The root token is the initial token created when initializing Vault. It has unlimited privileges and can perform any operation in Vault. As a best practice, the root token should be revoked and never stored after initial setup. This is because the root token is a single point of failure and a potential security risk if it is compromised or leaked. Instead of using the root token, Vault operators should create other tokens with appropriate policies and roles that allow them to perform their tasks. If a new root token is needed in an emergency, the vault operator generate-root command can be used to create one on-the-fly with the consent of a quorum of unseal key holders. Reference: Tokens | Vault | HashiCorp Developer, Generate root tokens using unseal keys | Vault | HashiCorp Developer
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