88 lines
3.1 KiB
Markdown
88 lines
3.1 KiB
Markdown
Context Statement
|
|
=================
|
|
|
|
Contexts are formed using previously declared parameters and may be named or anonymous where:
|
|
|
|
- Named - The context is declared with a context identifier that is used as a reference.
|
|
|
|
- Anonymous - They are defined within the CIL labeling statement using user, role etc. identifiers.
|
|
|
|
Each type is shown in the examples.
|
|
|
|
context
|
|
-------
|
|
|
|
Declare an SELinux security context identifier for labeling. The range (or current and clearance levels) MUST be defined whether the policy is MLS/MCS enabled or not.
|
|
|
|
**Statement definition:**
|
|
|
|
```secil
|
|
(context context_id (user_id role_id type_id levelrange_id)))
|
|
```
|
|
|
|
**Where:**
|
|
|
|
<table>
|
|
<colgroup>
|
|
<col width="25%" />
|
|
<col width="75%" />
|
|
</colgroup>
|
|
<tbody>
|
|
<tr class="odd">
|
|
<td align="left"><p><code>context</code></p></td>
|
|
<td align="left"><p>The <code>context</code> keyword.</p></td>
|
|
</tr>
|
|
<tr class="even">
|
|
<td align="left"><p><code>context_id</code></p></td>
|
|
<td align="left"><p>The <code>context</code> identifier.</p></td>
|
|
</tr>
|
|
<tr class="odd">
|
|
<td align="left"><p><code>user_id</code></p></td>
|
|
<td align="left"><p>A single previously declared <code>user</code> identifier.</p></td>
|
|
</tr>
|
|
<tr class="even">
|
|
<td align="left"><p><code>role_id</code></p></td>
|
|
<td align="left"><p>A single previously declared <code>role</code> identifier.</p></td>
|
|
</tr>
|
|
<tr class="odd">
|
|
<td align="left"><p><code>type_id</code></p></td>
|
|
<td align="left"><p>A single previously declared <code>type</code> or <code>typealias</code> identifier.</p></td>
|
|
</tr>
|
|
<tr class="even">
|
|
<td align="left"><p><code>levelrange_id</code></p></td>
|
|
<td align="left"><p>A single previously declared <code>levelrange</code> identifier. This entry may also be defined by anonymous or named <code>level</code>, <code>sensitivity</code>, <code>sensitivityalias</code>, <code>category</code>, <code>categoryalias</code> or <code>categoryset</code> as discussed in the <a href="#mls_labeling_statements">Multi-Level Security Labeling Statements</a> section and shown in the examples.</p></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
|
|
**Examples:**
|
|
|
|
This example uses a named context definition:
|
|
|
|
```secil
|
|
(context runas_exec_context (u object_r exec low_low))
|
|
|
|
(filecon "/system/bin/run-as" file runas_exec_context)
|
|
```
|
|
|
|
to resolve/build a `file_contexts` entry of (assuming MLS enabled policy):
|
|
|
|
```
|
|
/system/bin/run-as -- u:object_r:runas.exec:s0-s0
|
|
```
|
|
|
|
This example uses an anonymous context where the previously declared `user role type levelrange` identifiers are used to specify two [`portcon`](cil_network_labeling_statements.md#portcon) statements:
|
|
|
|
```secil
|
|
(portcon udp 1024 (test.user object_r test.process ((s0) (s1))))
|
|
(portcon tcp 1024 (test.user object_r test.process (system_low system_high)))
|
|
```
|
|
|
|
This example uses an anonymous context for the first and named context for the second in a [`netifcon`](cil_network_labeling_statements.md#netifcon) statement:
|
|
|
|
```secil
|
|
(context netif_context (test.user object_r test.process ((s0 (c0)) (s1 (c0)))))
|
|
|
|
(netifcon eth04 (test.user object_r test.process ((s0 (c0)) (s1 (c0)))) netif_context)
|
|
```
|