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# API Authn/Authz
* Authn: Prove who you say you are (e.g. passport)
* Authz: Prove that you're allowed to do what you're trying to do. (e.g. plane ticket)
## Example
* [Auth0][5]
* provides [OpenID Connect][4].
* returns an access token.
* UI (:3000)
* initiates a login/logout with Auth0.
* retrieves data from the api using the access token.
* API (:4000)
* authorizes requests using the access token from the request.
* returns data via a REST API.
```
||========================||
---------- --------- || --------------- ------ ||
| UI | | Auth0 | || | API ||| PDP | | DB | ||
---------- --------- || --------------- ------ ||
| | || | | | ||
| GET /login | || | | | ||
|----------->| || | | | ||
|<-----------| || | | | ||
| "x.y.z" | || | | | ||
| | || | | | ||
| GET /atlas/{id} || | | | ||
| Authorization: "x.y.z" | | | ||
|----------------------->| | | ||
| | || |------>| | ||
| | || | allow | | ||
| | || |<------| | ||
| | || | | | ||
| | || |-------------->| ||
| | || | | | ||
| | || |<--------------| ||
|<-----------------------| | | ||
| | || | | | ||
| DELETE /atlas/{id}| | | | ||
| Authorization: "x.y.z" | | | ||
|----------------------->| | | ||
| | || |------>| | ||
| | || | deny | | ||
| | || |<------| | ||
|<-----------------------| | | ||
| | ||========================||
```
## Access Token
```json
{
"iss": "https://cmd0-dev.us.auth0.com/",
"sub": "auth0|627b10e1019dd10068e03db4",
"aud": [
"https://api.cmdzero.io",
"https://cmd0-dev.us.auth0.com/userinfo"
],
"iat": 1652843177,
"exp": 1652929577,
"azp": "zap85dH6ugiMvGCaXeHRjvD4AC1AOiU9",
"scope": "openid profile email offline_access",
"permissions": [
"read:incidents"
]
}
```
## Policy
The [PDP][1] enforces policy by checking:
* casbin policies to match the subject, request path, and request method.
* subject is defined in the access token.
* permissions are defined in the access token.
## Example
Rule
```conf
[request_definition]
r = subject, resource, action
[policy_definition]
p = subject, resource, action
[policy_effect]
e = some(where (p.eft == allow))
[matchers]
m = (p.subject == "*" || r.subject == p.subject) && r.resource == p.resource && r.action == p.action
```
| policy | subject | resource | method |
| ------ | ------------------------ | ------------------------------- | ------ |
| p | * | /api/atlas | GET |
| p | * | /api/notifications/global | GET |
| p | * | /api/public | GET |
| p | 627b10e1019dd10068e03db4 | /api/notifications/QwfsJDutXwPD | GET |
Example 1:
```http
GET /api/public
200 OK
```
Example 2:
```http
GET /api/public
Authorization: Bearer access_token("627b10e1019dd10068e03db4")
200 OK
```
Example 3:
```http
GET /api/notifications/QwfsJDutXwPD
Authorization: Bearer access_token("627b10e1019dd10068e03db4")
200 OK
```
Example 4:
```http
GET /api/notifications/QwfsJDutXwPD
Authorization: Bearer access_token("f00d1e")
401 Unauthorized
```
[ABAC][2]
## Roles
What about Roles?
Rule
```
[request_definition]
r = subject, resource, action
[role_definition]
g = subject, role, domain
[policy_definition]
p = role, domain, resource, action
[policy_effect]
e = some(where (p.eft == allow))
[matchers]
m = g(r.subject, p.role, r.domain) && r.resource == p.resource && r.action == p.action
```
Policies
| policy | role | domain | resource | action |
| ------ | ----- | ------- | -------- | ------ |
| p | admin | domain1 | data1 | read |
| p | admin | domain1 | data1 | write |
| p | admin | domain2 | data2 | read |
| p | admin | domain2 | data2 | write |
Groups
| group | subject | role | domain |
| ----- | ------- | ---- | ------ |
| g | alice | admin | * |
| g | bob | admin | domain2 |
[RBAC][3]
[1]: https://csrc.nist.gov/glossary/term/policy_decision_point
[2]: https://casbin.org/docs/en/abac
[3]: https://casbin.org/docs/en/rbac
[4]: https://openid.net/specs/openid-connect-core-1_0.html#TokenResponse
[5]: https://auth0.com/docs/secure/tokens/access-tokens/get-access-tokens#control-access-token-audience
|
