Vault is a tool for securely accessing secrets. A secret is anything that you want to tightly control access to, such as API keys, passwords, or certificates. Vault provides a unified interface to any secret, while providing tight access control and recording a detailed audit log.

A modern system requires access to a multitude of secrets: database credentials, API keys for external services, credentials for service-oriented architecture communication, etc. Understanding who is accessing what secrets is already very difficult and platform-specific. Adding on key rolling, secure storage, and detailed audit logs is almost impossible without a custom solution. This is where Vault steps in.

The key features of Vault are:

  • Secure Secret Storage: Arbitrary key/value secrets can be stored in Vault. Vault encrypts these secrets prior to writing them to persistent storage, so gaining access to the raw storage isn’t enough to access your secrets. Vault can write to disk, Consul, and more.
  • Dynamic Secrets: Vault can generate secrets on-demand for some systems, such as AWS or SQL databases. For example, when an application needs to access an S3 bucket, it asks Vault for credentials, and Vault will generate an AWS keypair with valid permissions on demand. After creating these dynamic secrets, Vault will also automatically revoke them after the lease is up.
  • Data Encryption: Vault can encrypt and decrypt data without storing it. This allows security teams to define encryption parameters and developers to store encrypted data in a location such as SQL without having to design their own encryption methods.
  • Leasing and Renewal: All secrets in Vault have a lease associated with them. At the end of the lease, Vault will automatically revoke that secret. Clients are able to renew leases via built-in renew APIs.
  • Revocation: Vault has built-in support for secret revocation. Vault can revoke not only single secrets, but a tree of secrets, for example all secrets read by a specific user, or all secrets of a particular type. Revocation assists in key rolling as well as locking down systems in the case of an intrusion.

Vault installation in EL/7

We will download the binaries from vaulproject.io:

[[email protected] ~]#  wget https://releases.hashicorp.com/vault/1.2.3/vault_1.2.3_linux_amd64.zip

Unzip the file:

[[email protected] ~]#  unzip vault_1.2.3_linux_amd64.zip

Place the binari inside the PATH folder

[[email protected] ~]#  mv vault /usr/local/bin/

Run the autocomplete install command, export the following env to your profile and reload the shell

[[email protected] ~]#  vault -autocomplete-install
[[email protected] ~]# echo “export VAULT_ADDR=http://127.0.0.1:8200” >> ~/.bashrc
[[email protected] ~]# exec $SHELL

Run the dev server with the command:

[[email protected] ~]#  vault server -dev

Now we are able to save a secret, try to enter the followign command

[[email protected] ~]#  vault kv put secret/hello foo=world
Key Value
— —–
created_time 2019-11-07T21:34:03.909652779Z
deletion_time n/a
destroyed false
version 1

Now retrieve your secret with the following command

[[email protected] ~]#  vault kv get secret/hello
====== Metadata ======
Key Value
— —–
created_time 2019-11-07T21:34:03.909652779Z
deletion_time n/a
destroyed false
version 1

=== Data ===
Key Value
— —–
foo world

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