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UC3 Inheritance #216

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UC 3 Inheritance
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85 changes: 85 additions & 0 deletions proposals/evaluation/uc-3-inheritance.md
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# Access Inheritance Use Cases

Within this document, the following namespace prefix bindings are used:

| Prefix | Namespace |
| ------- | --------------------------------- |
| acl | http://www.w3.org/ns/auth/acl# |
| acp | http://www.w3.org/ns/solid/acp# |
| ex | https://example.com/ |
| ldp | http://www.w3.org/ns/ldp# |
| vcard | http://www.w3.org/2006/vcard/ns# |
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## Read access on a collection of resources

See also: https://solid.github.io/authorization-panel/authorization-ucr/#inheritance-readonly

Alice can read all resources in a collection.

### ACP

```turtle
ex:Collection1
acp:accessControl ex:AccessControl1 ;
ldp:contains ex:Resource1 .
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ex:AccessControl1
acp:applyMembers ex:Policy1 .

ex:Policy1
acp:anyOf ex:AgentMatcher1 ;
acp:allow acl:Read .

ex:AgentMatcher1
acp:agent ex:Alice .
```

Note: Resources linked to a collection via `ldp:contains` will inherit policies linked to the collection's access control via `acp:applyMembers`. Collections linked to a collection via `ldp:contains` will pass the inherited policies through to their member resources.

### WAC

The Weekly status collection is an `ldp:BasicContainer`, which contains a number of `ldp:BasicContainers`, one for each weekly meeting. The advantage of having these as containers rather than plain resources is that any number of other documents can be added to the container too.

```turtle
# Resource: </weekly-status/>
<.>
a ldp:BasicContainer ;
ldp:contains <2021-04-28/>, <2021-05-05/>, <2021-05-12/> .
```

The `</weekly-status/.acl>` resource is advertised as `</weekly-status/>`'s access control list via a `Link` header with a relationship type of `http://www.w3.org/ns/auth/acl#accessControl`.
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We have the following hierarchy of resources:

```
</weekly-status/>
</weekly-status/.acl>
</weekly-status/2021-04-28/>
</weekly-status/2021-05-05/>
</weekly-status/2021-05-12/>
```

Bob and Alice are members of the research group `</groups/research#g1>`:

```turtle
# Resource: </groups/research>
<#g1>
a vcard:Group ;
vcard:hasMember ex:Bob ;
vcard:hasMember ex:Alice .
```

The acl enabling read access to all resources contained by `</weekly-status/>` for all members of group `</groups/research#g1>` is:

```turtle
# Resource: </weekly-status/.acl>
<#authorization>
a acl:Authorization ;
acl:agentGroup </groups/research#g1> ;
acl:default <./> ;
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acl:mode acl:Read .
```

Note: A resource will use its parent container's access control `acl:default` authorization unless it has its own access control defined (parentage being defined via the `ldp:contains` predicate). Inheritance is not granular and can be cut off by adding an access control to a resource at any point in the resource hierarchy tree. If the parent container doesn't have an access control, the WAC inheritance algorithm works its way up through `ldp:contains` predicates.

The downside of this is that adding an access control resource, requires all the relevant rules to be copied to the new acr, creating duplication of rules.
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