Pivotal Cloud Foundry (CF) auth method (API)

This is the API documentation for the Vault CF auth method. For general information about the usage and operation of the CF method, please see the Vault CF method documentation.

This documentation assumes the CF method is mounted at the /auth/cf path in Vault. Since it is possible to enable auth methods at any location, please update your API calls accordingly.

Create configuration

Configure the root CA certificate to be used for verifying instance identity certificates, and configure access to the CF API. For detailed instructions on how to obtain these values, please see the Vault CF method documentation.

Method	Path
POST	/auth/cf/config

Parameters

• identity_ca_certificates (array: [], required) - The root CA certificate(s) to be used for verifying that the CF_INSTANCE_CERT presented for logging in was issued by the proper authority.

• cf_api_addr (string: required): CF's full API address, to be used for verifying that a given CF_INSTANCE_CERT shows an application ID, space ID, and organization ID that presently exist.

• cf_username (string: required): The username for authenticating to the CF API.

• cf_password (string: required): The password for authenticating to the CF API.

• cf_api_trusted_certificates (array: []): The certificate that's presented by the CF API. This configures Vault to trust this certificate when making API calls, resolving x509: certificate signed by unknown authority errors.

• login_max_seconds_not_before (int: 300): The maximum number of seconds in the past when a signature could have been created. The lower the value, the lower the risk of replay attacks.

• login_max_seconds_not_after (int: 60): In case of clock drift, the maximum number of seconds in the future when a signature could have been created. The lower the value, the lower the risk of replay attacks.

Sample payload

{
  "identity_ca_certificates": [
    "-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----"
  ],
  "cf_api_addr": "https://api.sys.somewhere.cf-app.com",
  "cf_username": "vault",
  "cf_password": "pa55w0rd",
  "cf_api_trusted_certificates": [
    "-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----"
  ],
  "login_max_seconds_not_before": 5,
  "login_max_seconds_not_after": 1
}

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/cf/config

Read config

Returns the present CF configuration.

Method	Path
GET	/auth/cf/config

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/auth/cf/config

Sample response

{
  "identity_ca_certificates": [
    "-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----"
  ],
  "cf_api_addr": "https://api.sys.somewhere.cf-app.com",
  "cf_username": "vault",
  "cf_api_trusted_certificates": [
    "-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----"
  ],
  "login_max_seconds_not_before": 5,
  "login_max_seconds_not_after": 1
}

Delete config

Deletes the present CF configuration.

Method	Path
DELETE	/auth/cf/config

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request DELETE \
    http://127.0.0.1:8200/v1/auth/cf/config

Create/Update role

Create a role in Vault granting a particular level of access to a particular group of CF instances. We recommend using the CF API or the CF CLI to gain the IDs you wish to target.

If you list no bound parameters, then any entity with a valid CF_INSTANCE_CERT that's been issued by any configured identity_ca_certificates will be able to authenticate against this role.

Method	Path
POST	/auth/cf/roles/:role

Parameters

• role (string: required) - The name of the role.

• bound_application_ids (array: []) - An optional list of application IDs an instance must be a member of to qualify as a member of this role.

• bound_space_ids (array: []) - An optional list of space IDs an instance must be a member of to qualify as a member of this role.

• bound_organization_ids (array: []) - An optional list of organization IDs an instance must be a member of to qualify as a member of this role.

• bound_instance_ids (array: []) - An optional list of instance IDs an instance must be a member of to qualify as a member of this role. Please note that every time you use cf push on an app, its instance ID changes. Also, instance IDs are not verifiable as being presently alive using the CF API. Thus, we recommend against using this setting for most use cases.

• disable_ip_matching (bool: false) - If set to true, disables the default behavior that logging in must be performed from an acceptable IP address described by the certificate presented. Should only be set to true if required, generally when a proxy is used to perform logins.

@include 'tokenfields.mdx'

Sample payload

{
  "bound_application_ids": ["09d7eb6a-afc2-49a0-bb32-858c22f2b346"],
  "bound_space_ids": ["21005ebb-8943-433e-84e6-d9d9d7338853"],
  "bound_organization_ids": ["9785a884-5e93-49bd-97ee-57bf7c2b20e0"],
  "bound_instance_ids": ["f3e0f176-3f83-4efb-5842-2ff4"],
  "bound_cidrs": ["127.0.0.1/32", "128.252.0.0/16"],
  "policies": ["default"],
  "ttl": "1h",
  "max_ttl": "1h",
  "period": "1h"
}

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/cf/roles/:role

Read role

Returns a CF role.

Method	Path
GET	/auth/cf/roles/:role

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/auth/cf/roles/:role

Sample response

{
  "bound_application_ids": ["09d7eb6a-afc2-49a0-bb32-858c22f2b346"],
  "bound_space_ids": ["21005ebb-8943-433e-84e6-d9d9d7338853"],
  "bound_organization_ids": ["9785a884-5e93-49bd-97ee-57bf7c2b20e0"],
  "bound_instance_ids": ["f3e0f176-3f83-4efb-5842-2ff4"],
  "bound_cidrs": ["127.0.0.1/32", "128.252.0.0/16"],
  "policies": ["default"],
  "ttl": 2764790,
  "max_ttl": 2764790,
  "period": 2764790
}

Delete role

Deletes a CF role.

Method	Path
DELETE	/auth/cf/roles/:role

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request DELETE \
    http://127.0.0.1:8200/v1/auth/cf/roles/:role

List roles

Returns a CF role.

Method	Path
LIST	/auth/cf/roles

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request LIST
    http://127.0.0.1:8200/v1/auth/cf/roles

Sample response

{
  "data": {
    "keys": ["role1", "role2"]
  }
}

Login

Log in to CF.

Vault provides both an agent and a CLI tool for logging in that eliminates the need to build a signature yourself. However, if you do wish to build the signature, its signing algorithm is viewable here. The plugin repo also contains a command-line tool (generate-signature) that can be compiled as a binary for generating a signature, and a test that outputs steps in generating the signature so they can be duplicated.

However, at a high level, these are the steps for generating a signature:

• Get and format the current time, ex. 2006-01-02T15:04:05Z.

• Get the full body of the file located at CF_INSTANCE_CERT.

• Get the name of the role.

• Concatenate them together in the above order, with no extra string used for joining them.

• Create a SHA256 checksum of the resulting string (checksum below).

• Sign the string using the key located at CF_INSTANCE_KEY. In Go, this is performed using the following line of code which you can more deeply inspect:

rsa.SignPSS(rand.Reader, rsaPrivateKey, crypto.SHA256, checksum, nil)

• Convert the signature to a string.

Method	Path
POST	/auth/cf/login

Parameters

• role (string: required) - The name of the role.

• cf_instance_cert (string: required) - The full body of the file available at the path denoted by CF_INSTANCE_CERT.

• signing_time (string: required) - The date and time used to construct the signature.

• signature (string: required) - The signature generated by the algorithm described above using the CF_INSTANCE_KEY.

Sample payload

{
  "role": "test-role",
  "cf_instance_cert": "-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----\n-----BEGIN CERTIFICATE-----\nMIIEtzCCA5+.......ZRtAfQ6r\nwlW975rYa1ZqEdA=\n-----END CERTIFICATE-----",
  "signing_time": "2006-01-02T15:04:05Z",
  "signature": "MmyUjQ1OqxQmF0W6raVQDL-hlqqe1oG-7abA6Oi3NHwT-9lMfrYxsCwMnd2HKGMly2tCgetcoA2orfquoe6MkMuksx_KGH_KLObcAykt53z4rHceHKGvm7eGj60cjWFYtiNPic-lzUGERLbUeKLMi6NlThm9ueb7hhpyTUpEYtphV3gorbVxvlkrnuYSbgy2NGpOUY1N8dRzcxmHkYjh12XoWEw4Is5aFr6eFKbZ0vmLWBzhJ7_w20CFyTpRYB-6heGz1iR9qEG8mZk3_x4rZpT5mejJ5zmH2xlUjBJMndfcz47btEi2BO9pFVxK2wK-tKeUUFgx6RcomAopTskkmg=="
}

Sample request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/cf/login

Sample response

{
  "auth": {
    "renewable": true,
    "lease_duration": 1800000,
    "policies": ["default", "dev"],
    "accessor": "20b89871-e6f2-1160-fb29-31c2f6d4645e",
    "client_token": "c9368254-3f21-aded-8a6f-7c818e81b17a"
  }
}