MinIO Vault Database Plugin

This plugin allows Vault to manage MinIO authentication and authorization.

Prerequisites

MinIO

After initialization, you will need to create a policy and dedicated user account for Vault.

The policy should look like this:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "admin:CreateUser",
                "admin:ListGroups",
                "admin:EnableUser",
                "admin:GetPolicy",
                "admin:GetUser",
                "admin:RemoveUserFromGroup",
                "admin:ServerInfo",
                "admin:CreatePolicy",
                "admin:DisableGroup",
                "admin:EnableGroup",
                "admin:DisableUser",
                "admin:ListUserPolicies",
                "admin:DeleteUser",
                "admin:GetGroup",
                "admin:ListUsers",
                "admin:AddUserToGroup",
                "admin:AttachUserOrGroupPolicy",
                "admin:DeletePolicy"
            ]
        }
    ]
}

Proceed with creating the Vault user and assign it this policy.

Vault

First, ensure your Vault configuration defines plugin_directory and api_address correctly (the latter is used for inter-process communication, consider TLS certificates!).

Currently, there are no binary releases, hence you will need to compile this plugin, e.g.:

go build ./cmd/minio-database-plugin
# or gox -osarch="linux/amd64" ./cmd/minio-database-plugin

Then move the plugin into plugin_directory, ensure correct ownership/permissions and register it:

vault plugin register -sha256=${BINARY_SHA_SUM} minio-database-plugin

Configuration

Connection

• host: FQDN/IP address of the MinIO API. Required.
• port: The port the MinIO API server is listening on (int). Defaults to 9000.
• username: The name of the dedicated Vault user. Required.
• password: The initial password of the dedicated Vault user. Required.
• tls: Whether to enable TLS. Defaults to false.
• insecure_tls: Whether to skip verifying server certificates. Defaults to false.
• tls_server_name: Specifies the name to use as the SNI host when connecting to the MinIO server via TLS.
• tls_min_version: Minimum acceptable TLS version (string). Defaults to 1.2
• pem_bundle: Specifies concatenated PEM blocks containing a certificate and private key; a certificate, private key, and issuing CA certificate; or just a CA certificate. Only one of pem_bundle or pem_json can be specified.
• pem_json: Specifies JSON containing a certificate and private key; a certificate, private key, and issuing CA certificate; or just a CA certificate. The value in this field must be an encoded JSON object. For convenience, the format is the same as the output of the issue command from the pki secrets engine; see the pki documentation. Only one of pem_bundle or pem_json can be specified.
• connect_timeout: Timeout for HTTP connections. Defaults to 5s.

Role

A role's creation_statements define which permissions the issued user will carry and, optionally, which groups the user will belong to. It should be a list containing a single, JSON-encoded string value. The JSON data can contain the following fields:

• policy: IAM policy which will be created for each issued user account. This is the most secure method of assigning permissions.
• static_policies: A string-valued list of existing policy names that should be assigned to a user account issued under this role. Mind that the policies themselves are not managed by Vault.
• groups: A list of group names the issued user should be part of. Groups are created on demand. Mind that the associated policy itself is not managed by Vault.

Notes

• This plugin is in very early development.
• MinIO must be not be using the Gateway/Filesystem backends, otherwise you will see this error: This 'admin' API is not supported by server in 'mode-server-fs'. Noticeably, the TrueNAS CORE native S3 service is outdated in that respect. You can install the MinIO plugin though, which is more recent.

Related

• https://github.com/kula/vault-plugin-secrets-minio