Keycloak Quickstart Guide

Keycloak is an open source Identity and Access Management solution aimed at modern applications and services, this document covers configuring Keycloak identity provider support with MinIO.

Prerequisites

Configure and install keycloak server by following Keycloak Installation Guide. For a quick installation, docker-compose reference configs are also available on the Keycloak GitHub.

Configure Keycloak Realm

Go to Clients
- Click on account
  - Settings
  - Change Access Type to confidential.
  - Save
- Click on credentials tab
  - Copy the Secret to clipboard.
  - This value is needed for MINIO_IDENTITY_OPENID_CLIENT_SECRET for MinIO.
Go to Users
- Click on the user
- Attribute, add a new attribute Key is policy, Value is name of the policy on MinIO (ex: readwrite)
- Add and Save
Go to Clients
- Click on account
- Settings, set Valid Redirect URIs to *, expand Advanced Settings and set Access Token Lifespan to 1 Hours
- Save
Go to Clients
- Click on account
- Mappers
- Create
  - Name with any text
  - Mapper Type is User Attribute
  - User Attribute is policy
  - Token Claim Name is policy
  - Claim JSON Type is string
- Save
Open http://localhost:8080/auth/realms/{your-realm-name}/.well-known/openid-configuration to verify OpenID discovery document, verify it has authorization_endpoint and jwks_uri

Enable Keycloak Admin REST API support

Before being able to authenticate against the Admin REST API using a client_id and a client_secret you need to make sure the client is configured as it follows:

account client_id is a confidential client that belongs to the realm {realm}
account client_id is has Service Accounts Enabled option enabled.
account client_id has a custom "Audience" mapper, in the Mappers section.
- Included Client Audience: security-admin-console

Adding 'admin' Role

Go to Roles
- Add new Role admin with Description ${role_admin}.
- Add this Role into compositive role named default-roles-{realm} - {realm} should be replaced with whatever realm you created from prerequisites section. This role is automatically trusted in the 'Service Accounts' tab.
Check that account client_id has the role 'admin' assigned in the "Service Account Roles" tab.

After that, you will be able to obtain an id_token for the Admin REST API using client_id and client_secret:

curl \
  -d "client_id=<YOUR_CLIENT_ID>" \
  -d "client_secret=<YOUR_CLIENT_SECRET>" \
  -d "grant_type=client_credentials" \
  "http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token"

The result will be a JSON document. To invoke the API you need to extract the value of the access_token property. You can then invoke the API by including the value in the Authorization header of requests to the API.

The following example shows how to get the details of the user with {userid} from {realm} realm:

curl \
  -H "Authorization: Bearer eyJhbGciOiJSUz..." \
  "http://localhost:8080/auth/admin/realms/{realm}/users/{userid}"

Configure MinIO

export MINIO_ROOT_USER=minio
export MINIO_ROOT_PASSWORD=minio123
minio server /mnt/export

Here are all the available options to configure OpenID connect

mc admin config set myminio/ identity_openid

KEY:
identity_openid  enable OpenID SSO support

ARGS:
config_url*   (url)       openid discovery document e.g. "https://accounts.google.com/.well-known/openid-configuration"
client_id     (string)    unique public identifier for apps e.g. "292085223830.apps.googleusercontent.com"
claim_name    (string)    JWT canned policy claim name, defaults to "policy"
claim_prefix  (string)    JWT claim namespace prefix e.g. "customer1/"
scopes        (csv)       Comma separated list of OpenID scopes for server, defaults to advertised scopes from discovery document e.g. "email,admin"
comment       (sentence)  optionally add a comment to this setting

and ENV based options

mc admin config set myminio/ identity_openid --env

KEY:
identity_openid  enable OpenID SSO support

ARGS:
MINIO_IDENTITY_OPENID_CONFIG_URL*   (url)       openid discovery document e.g. "https://accounts.google.com/.well-known/openid-configuration"
MINIO_IDENTITY_OPENID_CLIENT_ID     (string)    unique public identifier for apps e.g. "292085223830.apps.googleusercontent.com"
MINIO_IDENTITY_OPENID_CLAIM_NAME    (string)    JWT canned policy claim name, defaults to "policy"
MINIO_IDENTITY_OPENID_CLAIM_PREFIX  (string)    JWT claim namespace prefix e.g. "customer1/"
MINIO_IDENTITY_OPENID_SCOPES        (csv)       Comma separated list of OpenID scopes for server, defaults to advertised scopes from discovery document e.g. "email,admin"
MINIO_IDENTITY_OPENID_COMMENT       (sentence)  optionally add a comment to this setting

Set identity_openid config with config_url, client_id and restart MinIO

~ mc admin config set myminio identity_openid config_url="http://localhost:8080/auth/realms/{your-realm-name}/.well-known/openid-configuration" client_id="account"

NOTE: You can configure the scopes parameter to restrict the OpenID scopes requested by minio to the IdP, for example, "openid,policy_role_attribute", being policy_role_attribute a client_scope / client_mapper that maps a role attribute called policy to a policy claim returned by Keycloak

Once successfully set restart the MinIO instance.

mc admin service restart myminio

Using WebIdentiy API

Client ID can be found by clicking any of the clients listed here. If you have followed the above steps docs, the default Client ID will be account.

$ go run docs/sts/web-identity.go -cid account -csec 072e7f00-4289-469c-9ab2-bbe843c7f5a8  -config-ep "http://localhost:8080/auth/realms/minio/.well-known/openid-configuration" -port 8888
2018/12/26 17:49:36 listening on http://localhost:8888/

This will open the login page of keycloak, upon successful login, STS credentials along with any buckets discovered using the credentials will be printed on the screen, for example:

{
  "buckets": [
    "bucket-x"
  ],
  "credentials": {
    "AccessKeyID": "6N2BALX7ELO827DXS3GK",
    "SecretAccessKey": "23JKqAD+um8ObHqzfIh+bfqwG9V8qs9tFY6MqeFR+xxx",
    "SessionToken": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.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._UG_-ZHgwdRnsp0gFdwChb7VlbPs-Gr_RNUz9EV7TggCD59qjCFAKjNrVHfOSVkKvYEMe0PvwfRKjnJl3A_mBA"",
    "SignerType": 1
  }
}

NOTE: You can use the -cscopes parameter to restrict the requested scopes, for example to "openid,policy_role_attribute", being policy_role_attribute a client_scope / client_mapper that maps a role attribute called policy to a policy claim returned by Keycloak.

These credentials can now be used to perform MinIO API operations.

Using MinIO Console

Open MinIO URL on the browser, lets say http://localhost:9000/
Click on Login with SSO
User will be redirected to the Keycloak user login page, upon successful login the user will be redirected to MinIO page and logged in automatically, the user should see now the buckets and objects they have access to.

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