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Keycloak Quickstart Guide

Keycloak is an open source Identity and Access Management solution aimed at modern applications and services, this document covers configuring Keycloak to be used as an identity provider for MinIO server STS API.

1. Prerequisites

JAVA 1.8 and above installed
Download and start Keycloak server by following the installation guide (finish upto section 3.4)

2. Configure Keycloak

Go to Clients -> Click on account -> Settings -> Enable Implicit Flow, then Save.
Go to Users -> Click on the user -> Attribute, add a new attribute Key is policy, Value is name of the policy in minio (ex: readwrite). Click Add and then Save.
Go to Clients -> Click on account -> Settings, set Valid Redirect URIs to *, expand Advanced Settings and set Access Token Lifespan to 1 Hours, then Save.
Go to Clients -> Client on account -> Mappers -> Create, Name can be any text, Mapper Type is User Attribute, User Attribute is policy, Token Claim Name is policy, Claim JSON Type is string, then Save.
Open http://localhost:8080/auth/realms/demo/.well-known/openid-configuration and see if it has authorization_endpoint and jwks_uri

3. Configure MinIO

$ export MINIO_ACCESS_KEY=minio
$ export MINIO_SECRET_KEY=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 for 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/demo/.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

4. 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/demo/.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.

5. Using MinIO Browser

Open MinIO url on the browser, for example http://localhost:9000
Click on Log in with OpenID
Provide Client ID and press ENTER
Now the user will be redirected to the Keycloak login page, upon successful login the user will be redirected to MinIO page and logged in automatically

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