184 lines
6.4 KiB
Markdown
184 lines
6.4 KiB
Markdown
Default Object Statements
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=========================
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These rules allow a default user, role, type and/or range to be used when computing a context for a new object. These require policy version 27 or 28 with kernels 3.5 or greater.
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defaultuser
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-----------
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Allows the default user to be taken from the source or target context when computing a new context for the object [`class`](cil_class_and_permission_statements.md#class) identifier. Requires policy version 27.
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**Statement definition:**
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(defaultuser class_id default)
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**Where:**
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<table>
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<colgroup>
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<col width="25%" />
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<col width="75%" />
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</colgroup>
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<tbody>
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<tr class="odd">
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<td align="left"><p><code>defaultuser</code></p></td>
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<td align="left"><p>The <code>defaultuser</code> keyword.</p></td>
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</tr>
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<tr class="even">
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<td align="left"><p><code>class_id</code></p></td>
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<td align="left"><p>A single previously declared <code>class</code> or <code>classmap</code> identifier, or a list of previously declared <code>class</code> or <code>classmap</code> identifiers enclosed within parentheses.</p></td>
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</tr>
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<tr class="odd">
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<td align="left"><p><code>default</code></p></td>
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<td align="left"><p>A keyword of either <code>source</code> or <code>target</code>.</p></td>
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</tr>
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</tbody>
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</table>
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**Example:**
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When creating new `binder`, `property_service`, `zygote` or `memprotect` objects the [`user`](cil_user_statements.md#user) component of the new security context will be taken from the `source` context:
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(class binder (impersonate call set_context_mgr transfer receive))
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(class property_service (set))
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(class zygote (specifyids specifyrlimits specifycapabilities specifyinvokewith specifyseinfo))
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(class memprotect (mmap_zero))
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(classmap android_classes (android))
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(classmapping android_classes android (binder (all)))
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(classmapping android_classes android (property_service (set)))
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(classmapping android_classes android (zygote (not (specifycapabilities))))
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(defaultuser (android_classes memprotect) source)
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; Will produce the following in the binary policy file:
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;; default_user binder source;
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;; default_user zygote source;
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;; default_user property_service source;
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;; default_user memprotect source;
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defaultrole
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-----------
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Allows the default role to be taken from the source or target context when computing a new context for the object [`class`](cil_class_and_permission_statements.md#class) identifier. Requires policy version 27.
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(defaultrole class_id default)
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**Where:**
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<table>
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<colgroup>
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<col width="25%" />
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<col width="75%" />
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</colgroup>
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<tbody>
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<tr class="odd">
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<td align="left"><p><code>defaultrole</code></p></td>
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<td align="left"><p>The <code>defaultrole</code> keyword.</p></td>
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</tr>
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<tr class="even">
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<td align="left"><p><code>class_id</code></p></td>
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<td align="left"><p>A single previously declared <code>class</code> or <code>classmap</code> identifier, or a list of previously declared <code>class</code> or <code>classmap</code> identifiers enclosed within parentheses.</p></td>
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</tr>
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<tr class="odd">
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<td align="left"><p><code>default</code></p></td>
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<td align="left"><p>A keyword of either <code>source</code> or <code>target</code>.</p></td>
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</tr>
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</tbody>
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</table>
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**Example:**
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When creating new `binder`, `property_service` or `zygote` objects the [`role`](cil_role_statements.md#role) component of the new security context will be taken from the `target` context:
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(class binder (impersonate call set_context_mgr transfer receive))
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(class property_service (set))
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(class zygote (specifyids specifyrlimits specifycapabilities specifyinvokewith specifyseinfo))
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(defaultrole (binder property_service zygote) target)
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; Will produce the following in the binary policy file:
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;; default_role binder target;
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;; default_role zygote target;
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;; default_role property_service target;
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defaulttype
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-----------
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Allows the default type to be taken from the source or target context when computing a new context for the object [`class`](cil_class_and_permission_statements.md#class) identifier. Requires policy version 28.
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**Statement definition:**
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(defaulttype class_id default)
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**Where:**
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<table>
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<colgroup>
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<col width="25%" />
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<col width="75%" />
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</colgroup>
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<tbody>
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<tr class="odd">
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<td align="left"><p><code>defaulttype</code></p></td>
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<td align="left"><p>The <code>defaulttype</code> keyword.</p></td>
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</tr>
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<tr class="even">
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<td align="left"><p><code>class_id</code></p></td>
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<td align="left"><p>A single previously declared <code>class</code> or <code>classmap</code> identifier, or a list of previously declared <code>class</code> or <code>classmap</code> identifiers enclosed within parentheses.</p></td>
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</tr>
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<tr class="odd">
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<td align="left"><p><code>default</code></p></td>
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<td align="left"><p>A keyword of either <code>source</code> or <code>target</code>.</p></td>
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</tr>
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</tbody>
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</table>
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**Example:**
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When creating a new `socket` object, the [`type`](cil_type_statements.md#type) component of the new security context will be taken from the `source` context:
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(defaulttype socket source)
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defaultrange
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------------
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Allows the default level or range to be taken from the source or target context when computing a new context for the object [`class`](cil_class_and_permission_statements.md#class) identifier. Requires policy version 27.
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**Statement definition:**
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(defaultrange class_id default range)
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**Where:**
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<table>
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<colgroup>
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<col width="25%" />
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<col width="75%" />
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</colgroup>
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<tbody>
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<tr class="odd">
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<td align="left"><p><code>defaultrange</code></p></td>
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<td align="left"><p>The <code>defaultrange</code> keyword.</p></td>
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</tr>
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<tr class="even">
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<td align="left"><p><code>class_id</code></p></td>
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<td align="left"><p>A single previously declared <code>class</code> or <code>classmap</code> identifier, or a list of previously declared <code>class</code> or <code>classmap</code> identifiers enclosed within parentheses.</p></td>
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</tr>
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<tr class="odd">
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<td align="left"><p><code>default</code></p></td>
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<td align="left"><p>A keyword of either <code>source</code> or <code>target</code>.</p></td>
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</tr>
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<tr class="even">
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<td align="left"><p><code>range</code></p></td>
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<td align="left"><p>A keyword of either <code>low</code>, <code>high</code> or <code>low-high</code>.</p></td>
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</tr>
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</tbody>
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</table>
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**Example:**
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When creating a new `file` object, the appropriate `range` component of the new security context will be taken from the `target` context:
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(defaultrange file target low_high)
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