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139 lines
5.1 KiB
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139 lines
5.1 KiB
Plaintext
---
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layout: docs
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page_title: Consul - Secrets Engines
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description: The Consul secrets engine for Vault generates tokens for Consul dynamically.
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---
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# Consul Secrets Engine
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The Consul secrets engine generates [Consul](https://www.consul.io) API tokens
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dynamically based on Consul ACL policies.
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## Setup
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Most secrets engines must be configured in advance before they can perform their
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functions. These steps are usually completed by an operator or configuration
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management tool.
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1. Enable the Consul secrets engine:
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```text
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$ vault secrets enable consul
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Success! Enabled the consul secrets engine at: consul/
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```
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By default, the secrets engine will mount at the name of the engine. To
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enable the secrets engine at a different path, use the `-path` argument.
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2. In Consul versions below 1.4, acquire a [management token][consul-mgmt-token] from Consul, using the
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`acl_master_token` from your Consul configuration file or another management
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token:
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```sh
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$ curl \
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--header "X-Consul-Token: my-management-token" \
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--request PUT \
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--data '{"Name": "sample", "Type": "management"}' \
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https://consul.rocks/v1/acl/create
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```
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Vault must have a management type token so that it can create and revoke ACL
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tokens. The response will return a new token:
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```json
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{
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"ID": "7652ba4c-0f6e-8e75-5724-5e083d72cfe4"
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}
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```
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For Consul 1.4 and above, use the command line to generate a token with the appropriate policy:
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```sh
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$ CONSUL_HTTP_TOKEN=d54fe46a-1f57-a589-3583-6b78e334b03b consul acl token create -policy-name=global-management
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AccessorID: 865dc5e9-e585-3180-7b49-4ddc0fc45135
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SecretID: ef35f0f1-885b-0cab-573c-7c91b65a7a7e
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Description:
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Local: false
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Create Time: 2018-10-22 17:40:24.128188 -0700 PDT
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Policies:
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00000000-0000-0000-0000-000000000001 - global-management
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```
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3. Configure Vault to connect and authenticate to Consul:
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```text
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$ vault write consul/config/access \
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address=127.0.0.1:8500 \
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token=7652ba4c-0f6e-8e75-5724-5e083d72cfe4
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Success! Data written to: consul/config/access
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```
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4. Configure a role that maps a name in Vault to a Consul ACL policy. Depending on your Consul version,
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you will either provide a policy document and a token_type, or a set of policies.
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When users generate credentials, they are generated against this role. For Consul versions below 1.4:
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```text
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$ vault write consul/roles/my-role policy=$(base64 <<< 'key "" { policy = "read" }')
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Success! Data written to: consul/roles/my-role
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```
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The policy must be base64-encoded. The policy language is [documented by Consul](https://www.consul.io/docs/internals/acl.html).
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For Consul versions 1.4 and above, [generate a policy in Consul](https://www.consul.io/docs/guides/acl.html), and proceed to link it to the role:
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```text
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$ vault write consul/roles/my-role policies=readonly
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Success! Data written to: consul/roles/my-role
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```
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-> **Token lease duration:** If you do not specify a value for `ttl` (or `lease` for Consul versions below 1.4) the tokens created using Vault's
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Consul secrets engine are created with a Time To Live (TTL) of 30 days. You can change the lease duration by passing `-ttl=<duration>` to the
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command above with "duration" being a string with a time suffix like "30s" or "1h".
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## Usage
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After the secrets engine is configured and a user/machine has a Vault token with
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the proper permission, it can generate credentials.
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Generate a new credential by reading from the `/creds` endpoint with the name
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of the role:
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```shell-session
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$ vault read consul/creds/my-role
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Key Value
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--- -----
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lease_id consul/creds/my-role/b2469121-f55f-53c5-89af-a3ba52b1d6d8
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lease_duration 768h
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lease_renewable true
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token 642783bf-1540-526f-d4de-fe1ac1aed6f0
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```
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When using Consul 1.4, the response will include the accessor for the token
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```shell-session
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$ vault read consul/creds/my-role
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Key Value
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--- -----
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lease_id consul/creds/my-role/7miMPnYaBCaVWDS9clNE0Nv3
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lease_duration 768h
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lease_renewable true
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accessor 6d5a0348-dffe-e87b-4266-2bec03800abb
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token bc7a42c0-9c59-23b4-8a09-7173c474dc42
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```
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!> **Expired token rotation:** Once a token's TTL expires, then Consul operations will no longer be allowed with it. This requires you to have an external process to rotate tokens. At this time, the recommended approach for operators is to rotate the tokens manually by creating a new token using the `vault read consul/creds/my-role` command. Once the token is synchronized with Consul, apply the token to the agents using the Consul API or CLI.
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## Learn
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Refer to [Administer Consul Access Control Tokens with
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Vault](https://learn.hashicorp.com/tutorials/consul/vault-consul-secrets) for a
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step-by-step tutorial.
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## API
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The Consul secrets engine has a full HTTP API. Please see the
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[Consul secrets engine API](/api/secret/consul) for more
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details.
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[consul-mgmt-token]: https://www.consul.io/docs/agent/http/acl.html#acl_create
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