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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>
145 lines
4.5 KiB
Markdown
145 lines
4.5 KiB
Markdown
---
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layout: default
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title: Access Control
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parent: Configuration
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nav_order: 1
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---
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# Access Control
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{: .no_toc }
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## Access Control List
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With **Authelia** you can define a list of rules that are going to be evaluated in
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sequential order when authorization is delegated to Authelia.
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The first matching rule of the list defines the policy applied to the resource, if
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no rule matches the resource a customizable default policy is applied.
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## Access Control Rule
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A rule defines two things:
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* the matching criteria of the request presented to the reverse proxy
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* the policy applied when all criteria match.
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The criteria are:
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* domain: domain targeted by the request.
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* resources: list of patterns that the path should match (one is sufficient).
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* subject: the user or group of users to define the policy for.
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* networks: the network range from where should comes the request.
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A rule is matched when all criteria of the rule match.
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## Policies
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A policy represents the level of authentication the user needs to pass before
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being authorized to request the resource.
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There exist 4 policies:
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* bypass: the resource is public as the user does not need any authentication to
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get access to it.
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* one_factor: the user needs to pass at least the first factor to get access to
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the resource.
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* two_factor: the user needs to pass two factors to get access to the resource.
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* deny: the user does not have access to the resource.
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## Domains
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The domains defined in rules must obviously be either a subdomain of the domain
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protected by Authelia or the protected domain itself. In order to match multiple
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subdomains, the wildcard matcher character `*.` can be used as prefix of the domain.
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For instance, to define a rule for all subdomains of *example.com*, one would use
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`*.example.com` in the rule. A single rule can define multiple domains for matching.
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These domains can be either listed in YAML-short form `["example1.com", "example2.com"]`
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or in YAML long-form as dashed list.
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## Resources
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A rule can define multiple regular expressions for matching the path of the resource
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similar to the list of domains. If any one of them matches, the resource criteria of
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the rule matches.
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## Subjects
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A subject is a representation of a user or a group of user for who the rule should apply.
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For a user with unique identifier `john`, the subject should be `user:john` and for a group
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uniquely identified by `developers`, the subject should be `group:developers`. Similar to resources
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and domains you can define multiple subjects in a single rule.
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If you want a combination of subjects to be matched at once using a logical `AND`, you can
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specify a nested list of subjects like `- ["group:developers", "group:admins"]`.
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In summary, the first list level of subjects are evaluated using a logical `OR`, whereas the
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second level by a logical `AND`. The last example below reads as: the group is `dev` AND the
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username is `john` OR the group is `admins`.
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## Networks
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A list of network ranges can be specified in a rule in order to apply different policies when
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requests come from different networks.
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The main use case is when, lets say a resource should be exposed both on the Internet and from an
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authenticated VPN for instance. Passing a second factor a first time to get access to the VPN and
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a second time to get access to the application can sometimes be cumbersome if the endpoint is not
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considered overly sensitive.
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Even if Authelia provides this flexibility, you might prefer a higher level of security and avoid
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this option entirely. You and only you can define your security policy and it's up to you to
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configure Authelia accordingly.
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## Complete example
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Here is a complete example of complex access control list that can be defined in Authelia.
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```yaml
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access_control:
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default_policy: deny
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rules:
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- domain: public.example.com
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policy: bypass
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- domain: secure.example.com
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policy: one_factor
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networks:
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- 192.168.1.0/24
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- domain:
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- secure.example.com
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- private.example.com
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policy: two_factor
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- domain: singlefactor.example.com
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policy: one_factor
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- domain: "mx2.mail.example.com"
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subject: "group:admins"
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policy: deny
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- domain: "*.example.com"
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subject:
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- "group:admins"
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- "group:moderators"
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policy: two_factor
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- domain: dev.example.com
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resources:
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- "^/groups/dev/.*$"
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subject: "group:dev"
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policy: two_factor
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- domain: dev.example.com
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resources:
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- "^/users/john/.*$"
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subject:
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- ["group:dev", "user:john"]
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- "group:admins"
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policy: two_factor
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```
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