Based on the provided knowledge sources, I can explain the difference between the two endpoints you mentioned in Keto's REST API. 1. `/relation-tuples/check/openapi`: This endpoint is used to check permissions and returns a standard response. It's available via both GET and POST methods. The main characteristics of this endpoint are: - It returns a standard response format. - It doesn't return an error if the permission check fails. - It's designed to be more OpenAPI-friendly. [Keto API Reference](https://www.ory.sh/docs/keto/reference/rest-api) shows this endpoint for both GET and POST methods. 2. `/relation-tuples/check`: This endpoint is also used to check permissions, but it has a slightly different behavior: - It returns an error if the permission check fails. - It's available via both GET and POST methods. - It's designed to provide more detailed error information. [Keto API Reference](https://www.ory.sh/docs/keto/reference/rest-api) also shows this endpoint for both GET and POST methods. The main difference between these endpoints lies in their error handling and response format. The

/relation-tuples/check/openapi

endpoint is designed to be more compatible with OpenAPI specifications and provides a standardized response, while the

/relation-tuples/check

endpoint offers more detailed error information when a permission check fails. Both endpoints serve the same primary purpose of checking permissions, but they cater to different use cases depending on how you want to handle the responses and errors in your application.

Certainly! I can help you understand how to configure the

remote_json

authorizer in Oathkeeper to use Keto. Based on the information provided in the knowledge sources, here's how you can set it up: To use Keto through the

remote_json

authorizer in Oathkeeper, you need to configure the

remote

field in the authorizer configuration. This field should point to Keto's permission check endpoint. Here's an example of how you can configure it in your Oathkeeper access rule:

json {   "id": "some-id",   "upstream": {     "url": "<http://my-backend-service>"   },   "match": {     "url": "<http://my-app/api/<.*>>",     "methods": ["GET"]   },   "authenticators": [     {       "handler": "anonymous"     }   ],   "authorizer": {     "handler": "remote_json",     "config": {       "remote": "<http://my-keto/relation-tuples/check>",       "payload": "{\"subject\": \"{{ print .Subject }}\", \"relation\": \"allowed\", \"object\": \"{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}\"}"     }   },   "mutators": [     {       "handler": "noop"     }   ] }

In this configuration: 1. Set the

handler

to

remote_json

. 2. In the

config

section, set the

remote

field to your Keto instance's check endpoint. This would typically be

<http://your-keto-host/relation-tuples/check>

. 3. The

payload

field should contain the JSON structure that Keto expects for checking permissions. You can use Go templates to include dynamic values from the request context. [Oathkeeper Authorizers Documentation](https://www.ory.sh/docs/oathkeeper/pipeline/authz#remote_json) provides more details on configuring the

remote_json

authorizer. Remember to replace

<http://my-keto>

with the actual URL of your Keto instance. Also, adjust the payload structure according to your specific Keto configuration and permission model. Note that you could also use the

/relation-tuples/check/openapi

endpoint if you prefer the OpenAPI-friendly version, but the

/relation-tuples/check

endpoint might provide more detailed error information if the permission check fails.

Certainly! I'd be happy to provide more information on the relationships inside the payload for Keto's relation-tuples endpoint and how to populate the

config.payload

in the

remote_json

authorizer using Keto. The payload for Keto's relation-tuples endpoint typically contains the following components: 1. `namespace`: The namespace of the relationship 2. `object`: The object of the relationship 3. `relation`: The relation between the object and subject 4.

subject_id

or `subject_set`: The subject of the relationship Here's how you can populate the

config.payload

in the

remote_json

authorizer to use Keto:

json {   "authorizer": {     "handler": "remote_json",     "config": {       "remote": "<http://my-keto-instance/relation-tuples/check>",       "payload": |         {           "namespace": "files",           "object": "{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}",           "relation": "access",           "subject_id": "{{ print .Subject }}"         }     }   } }

Let's break down the payload: 1. `namespace`: This should match the namespace you've defined in your Keto configuration. For example, "files" as shown in the [Olymp Library example](https://www.ory.sh/docs/keto/examples/olymp-file-sharing). 2. `object`: This is the resource being accessed. In the example, we're using a regex capture group from the URL, but you could also use a static value or other context variables. 3. `relation`: This is the type of access being checked, like "access" or "owner". It should match the relations defined in your Keto namespace. 4. `subject_id`: This is typically the user or entity trying to access the resource. In the example, we're using the Subject from the authentication context. You can use Go templates to dynamically populate these fields based on the request context. For example: -

{{ print .Subject }}

prints the authenticated subject -

{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}

prints the first regex capture group from the URL -

{{ .MatchContext.Header.Get "X-Some-Header" }}

gets a value from the request headers [Oathkeeper Authorizers Documentation](https://www.ory.sh/docs/oathkeeper/pipeline/authz#remote_json-example) provides more examples of how to use these template functions. Remember, the exact structure of your payload will depend on your specific Keto configuration and permission model. You may need to adjust the namespace, relations, and other fields to match your setup. Also, note that you can use either

subject_id

for a direct subject, or

subject_set

for more complex subject relationships, as described in the [Keto API Reference](https://www.ory.sh/docs/keto/reference/rest-api). By configuring the payload correctly, you're instructing Oathkeeper to check with Keto whether the specified subject has the required relation (e.g., "access") to the specified object in the given namespace.

I understand your confusion about what should go into the general Oathkeeper configuration file (oathkeeper.yaml) versus the endpoint-level configurations. Let me clarify this for you based on the information from our knowledge sources. The general oathkeeper.yaml file is used to set up global configurations for Oathkeeper. Here's what you typically include in this file: 1. Server configuration:

yaml serve:   proxy:     port: 4455 # run the proxy at port 4455   api:     port: 4456 # run the api at port 4456

2. Access rules repository:

yaml access_rules:   repositories:     - file:///rules.json

3. Error handling configuration:

yaml errors:   fallback:     - json   handlers:     json:       enabled: true       config:         verbose: true

4. Global configurations for authenticators, authorizers, and mutators:

yaml authenticators:   anonymous:     enabled: true     config:       subject: guest    cookie_session:     enabled: true     config:       check_session_url: <http://kratos:4433/sessions/whoami>       preserve_path: true       extra_from: "@this"       subject_from: "identity.id"       only:         - ory_kratos_session  authorizers:   allow:     enabled: true  mutators:   noop:     enabled: true

This configuration is based on examples from the [Oathkeeper Configuration Documentation](https://www.ory.sh/docs/oathkeeper/configure-deploy#configure) and the [Zero Trust with Access Proxy guide](https://www.ory.sh/docs/kratos/guides/zero-trust-iap-proxy-identity-access-proxy#ory-oathkeeper-identity-and-access-proxy). The endpoint-specific configurations, including the

remote_json

authorizer setup for Keto that we discussed earlier, typically go into separate access rule files (like rules.json mentioned above) or can be defined inline in your application code. Remember, the oathkeeper.yaml file sets up the global environment and enables the components you want to use, while the access rules define how these components are applied to specific endpoints or routes.

You're absolutely right, and I apologize for not mentioning this important detail earlier. Yes, you should indeed enable the

remote_json

authorizer in the oathkeeper.yaml config file. Let me clarify this for you based on the documentation. According to the [Oathkeeper Authorizers Documentation](https://www.ory.sh/docs/oathkeeper/pipeline/authz#remote_json-configuration), you need to enable the

remote_json

authorizer in the global configuration file. Here's how you should do it:

yaml authorizers:   remote_json:     # Set enabled to "true" to enable the authenticator, and "false" to disable the authenticator. Defaults to "false".     enabled: true      config:       remote: <http://my-remote-authorizer/authorize>       headers:         X-Some-Header: '{{ .MatchContext.Header.Get "X-Some-Header" }}'       payload: |         {           "subject": "{{ print .Subject }}",           "resource": "{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}"         }

In this configuration: 1. Set

enabled: true

to enable the

remote_json

authorizer. 2. In the

config

section: - `remote`: This is the URL of your Keto instance's check endpoint (e.g., `http://my-keto/relation-tuples/check`). - `headers`: (Optional) Any headers you want to send with the request to Keto. - `payload`: The JSON payload to send to Keto, which you can customize based on your Keto configuration. The

config

section is indeed mandatory when enabling the authorizer. However, you don't need to provide all the details in the global configuration. You can provide a basic configuration here and then override or extend it in your specific access rules. For example, you could set up a basic configuration in oathkeeper.yaml:

yaml authorizers:   remote_json:     enabled: true     config:       remote: <http://my-keto/relation-tuples/check>

Then, in your specific access rules, you can provide more detailed configurations as needed:

json {   "id": "some-rule",   "authorizer": {     "handler": "remote_json",     "config": {       "payload": "{\"namespace\": \"files\", \"object\": \"{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}\", \"relation\": \"access\", \"subject_id\": \"{{ print .Subject }}\"}"     }   }   // ... other rule configurations }

This approach allows you to enable the authorizer globally while keeping the flexibility to customize its behavior for different access rules.

You're correct that the

payload

is mandatory in the

remote_json

config. Let me explain how you can structure it and use variables for namespaces and relations as well. In the Oathkeeper configuration, you can indeed use variables and Go template functions to make your payload more dynamic and reusable. Here's an example of how you can structure your payload:

yaml authorizers:   remote_json:     enabled: true     config:       remote: <http://my-keto/relation-tuples/check>       payload: |         {           "namespace": "{{ .MatchContext.Header.Get \"X-Keto-Namespace\" }}",           "object": "{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}",           "relation": "{{ .MatchContext.Header.Get \"X-Keto-Relation\" }}",           "subject_id": "{{ print .Subject }}"         }

In this configuration: 1. `namespace`: We're using a custom header

X-Keto-Namespace

to dynamically set the namespace. 2. `object`: This uses a regex capture group from the URL, as we discussed earlier. 3. `relation`: We're using another custom header

X-Keto-Relation

to set the relation dynamically. 4. `subject_id`: This uses the authenticated subject, as before. By using this approach, you can standardize your payload structure while still allowing for flexibility in different access rules. You would then need to ensure that your application sets the appropriate headers (

X-Keto-Namespace

and

X-Keto-Relation

) for each request. Alternatively, you could use environment variables in your Oathkeeper configuration:

yaml authorizers:   remote_json:     enabled: true     config:       remote: <http://my-keto/relation-tuples/check>       payload: |         {           "namespace": "{{ .Env.KETO_NAMESPACE }}",           "object": "{{ printIndex .MatchContext.RegexpCaptureGroups 0 }}",           "relation": "{{ .Env.KETO_RELATION }}",           "subject_id": "{{ print .Subject }}"         }

In this case, you would set the

KETO_NAMESPACE

and

KETO_RELATION

environment variables when starting Oathkeeper. Remember, the exact structure of your payload should match what your Keto instance expects. The examples provided here are based on the standard Keto relation tuple structure, but you may need to adjust it based on your specific Keto configuration. [Oathkeeper Authorizers Documentation](https://www.ory.sh/docs/oathkeeper/pipeline/authz#remote_json-example) provides more details on configuring the

remote_json

authorizer and using template functions in the payload. By using these techniques, you can create a more flexible and reusable configuration for your

remote_json

authorizer that works with Keto across different namespaces and relations.