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[DOCS] Clarify use of multiple subjects in ACLs and their logical evaluation (#1454)

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* Clarify use of multiple subjects and their logical evaluation

* Update docs/configuration/access-control.md

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
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Lukas Klass 2020-11-13 00:30:23 +01:00 committed by GitHub
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@ -55,11 +55,14 @@ protected by Authelia or the protected domain itself. In order to match multiple
subdomains, the wildcard matcher character `*.` can be used as prefix of the domain. subdomains, the wildcard matcher character `*.` can be used as prefix of the domain.
For instance, to define a rule for all subdomains of *example.com*, one would use For instance, to define a rule for all subdomains of *example.com*, one would use
`*.example.com` in the rule. A single rule can define multiple domains for matching. `*.example.com` in the rule. A single rule can define multiple domains for matching.
These domains can be either listed in YAML-short form `["example1.com", "example2.com"]`
or in YAML long-form as dashed list.
## Resources ## Resources
A rule can define multiple regular expressions for matching the path of the resource. If A rule can define multiple regular expressions for matching the path of the resource
any one of them matches, the resource criteria of the rule matches. similar to the list of domains. If any one of them matches, the resource criteria of
the rule matches.
## Subjects ## Subjects
@ -70,10 +73,11 @@ For a user with unique identifier `john`, the subject should be `user:john` and
uniquely identified by `developers`, the subject should be `group:developers`. Similar to resources uniquely identified by `developers`, the subject should be `group:developers`. Similar to resources
and domains you can define multiple subjects in a single rule. and domains you can define multiple subjects in a single rule.
If you want a combination of subjects to be matched at once, you can specify a list of subjects like If you want a combination of subjects to be matched at once using a logical `AND`, you can
`- ["group:developers", "group:admins"]`. Make sure to preceed it by a list key `-`. specify a nested list of subjects like `- ["group:developers", "group:admins"]`.
In summary, the first level of subjects are evaluated using a logical `OR`, whereas the second level In summary, the first list level of subjects are evaluated using a logical `OR`, whereas the
by a logical `AND`. second level by a logical `AND`. The last example below reads as: the group is `dev` AND the
username is `john` OR the group is `admins`.
## Networks ## Networks
@ -135,5 +139,6 @@ access_control:
- "^/users/john/.*$" - "^/users/john/.*$"
subject: subject:
- ["group:dev", "user:john"] - ["group:dev", "user:john"]
- "group:admins"
policy: two_factor policy: two_factor
``` ```