@@ -1,7 +1,7 @@
# Type Statements
These statements share the same namespace, therefore the general
-convention is to use `_t` as the final two characters of a type
+convention is to use *_t* as the final two characters of a type
identifier to differentiate it from an attribute identifier as shown in
the following examples:
@@ -13,12 +13,10 @@ type bin_t; # A type identifier generally ends with _t
attribute file_type; # An attribute identifier generally ends with _type
```
-<br>
+## *type*
-## `type`
-
-The `type` statement declares the type identifier and any optional
-associated `alias` or `attribute` identifiers. Type identifiers are a
+The *type* statement declares the type identifier and any optional
+associated *alias* or *attribute* identifiers. Type identifiers are a
component of the [**Security Context**](security_context.md#security-context).
**The statement definition is:**
@@ -27,57 +25,44 @@ component of the [**Security Context**](security_context.md#security-context).
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>type</code></td>
-<td>The <code>type</code> keyword.</td>
-</tr>
-<tr>
-<td><code>type_id</code></td>
-<td>The <code>type</code> identifier.</td>
-</tr>
-<tr>
-<td><code>alias</code></td>
-<td>Optional <code>alias</code> keyword that signifies alternate identifiers for the <code>type_id</code> that are declared in the <code>alias_id</code> list.</td>
-</tr>
-<tr>
-<td><code>alias_id</code></td>
-<td>One or more <code>alias</code> identifiers that have been previously declared by the <a href="#typealias"><code>typealias</code></a> statement. Multiple entries consist of a space separated list enclosed in braces '{}'.</td>
-</tr>
-<tr>
-<td><code>attribute_id</code></td>
-<td>One or more optional <code>attribute</code> identifiers that have been previously declared by the <a href="#attribute"><code>attribute</code></a> statement. Multiple entries consist of a comma ',' separated list, also note the lead comma.</td>
-</tr>
-</tbody>
-</table>
+*type*
+
+The *type* keyword.
+
+*type_id*
+
+The *type* identifier.
+
+*alias*
+
+Optional *alias* keyword that signifies alternate identifiers for the *type_id*
+that are declared in the *alias_id* list.
+
+*alias_id*
+
+One or more *alias* identifiers that have been previously declared by the
+[*typealias*](#typealias) statement. Multiple entries consist of a space
+separated list enclosed in braces '{}'.
+
+*attribute_id*
+
+One or more optional *attribute* identifiers that have been previously declared
+by the [*attribute*](#attribute) statement. Multiple entries consist of a comma
+',' separated list, also note the lead comma.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>No</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| No | Yes | Yes |
**Examples:**
@@ -134,12 +119,10 @@ attribute server_packet_type; # declare attribute 2
type ssh_server_packet_t, packet_type, server_packet_type;
```
-<br>
-
-## `attribute`
+## *attribute*
-An `attribute` statement declares an identifier that can then be used to
-refer to a group of `type` identifiers.
+An *attribute* statement declares an identifier that can then be used to
+refer to a group of *type* identifiers.
**The statement definition is:**
@@ -147,45 +130,27 @@ refer to a group of `type` identifiers.
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>attribute</code></td>
-<td>The <code>attribute</code> keyword.</td>
-</tr>
-<tr>
-<td><code>attribute_id</code></td>
-<td>The <code>attribute</code> identifier.</td>
-</tr>
-</tbody>
-</table>
+*attribute*
+
+The *attribute* keyword.
+
+*attribute_id*
+
+The *attribute* identifier.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>No</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| No | Yes | Yes |
**Examples:**
@@ -199,11 +164,9 @@ attribute file_type;
attribute non_security_file_type;
```
-<br>
-
-## `typeattribute`
+## *typeattribute*
-The `typeattribute` statement allows the association of previously
+The *typeattribute* statement allows the association of previously
declared types to one or more previously declared attributes.
**The statement definition is:**
@@ -212,49 +175,32 @@ declared types to one or more previously declared attributes.
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>typeattribute</code></td>
-<td>The <code>typeattribute</code> keyword.</td>
-</tr>
-<tr>
-<td><code>type_id</code></td>
-<td>The identifier of a previously declared <code>type</code>.</td>
-</tr>
-<tr>
-<td><code>attribute_id</code></td>
-<td>One or more previously declared <code>attribute</code> identifiers. Multiple entries consist of a comma ',' separated list.</td>
-</tr>
-</tbody>
-</table>
+*typeattribute*
+
+The *typeattribute* keyword.
+
+*type_id*
+
+The identifier of a previously declared *type*.
+
+*attribute_id*
+
+One or more previously declared *attribute* identifiers. Multiple entries
+consist of a comma ',' separated list.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>No</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| No | Yes | No |
**Examples:**
@@ -289,13 +235,11 @@ type setroubleshootd_exec_t;
typeattribute setroubleshootd_exec_t file_type, non_security_file_type;
```
-<br>
-
-## `typealias`
+## *typealias*
-The `typealias` statement allows the association of a previously declared
-`type` to one or more `alias` identifiers (an alternative way is to use the
-`type` statement.
+The *typealias* statement allows the association of a previously declared
+*type* to one or more *alias* identifiers (an alternative way is to use the
+*type* statement.
**The statement definition is:**
@@ -303,53 +247,36 @@ The `typealias` statement allows the association of a previously declared
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>typealias</code></td>
-<td>The <code>typealias</code> keyword.</td>
-</tr>
-<tr>
-<td><code>type_id</code></td>
-<td>The identifier of a previously declared <code>type</code>.</td>
-</tr>
-<tr>
-<td><code>alias</code></td>
-<td>The <code>alias</code> keyword.</td>
-</tr>
-<tr>
-<td><code>alias_id</code></td>
-<td>One or more <code>alias</code> identifiers. Multiple entries consist of a space separated list enclosed in braces '{}'.</td>
-</tr>
-</tbody>
-</table>
+*typealias*
+
+The *typealias* keyword.
+
+*type_id*
+
+The identifier of a previously declared *type*.
+
+*alias*
+
+The *alias* keyword.
+
+*alias_id*
+
+One or more *alias* identifiers. Multiple entries consist of a space separated
+list enclosed in braces '{}'.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>No</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| No | Yes | No |
**Examples:**
@@ -374,14 +301,12 @@ type netif_t;
typealias netif_t alias { lo_netif_t netif_lo_t };
```
-<br>
+## *permissive*
-## `permissive`
-
-Policy version 23 introduced the `permissive` statement to allow the named
+Policy version 23 introduced the *permissive* statement to allow the named
domain to run in permissive mode instead of running all SELinux domains
in permissive mode (that was the only option prior to version 23). Note
-that the `permissive` statement only tests the source context for any
+that the *permissive* statement only tests the source context for any
policy denial.
**The statement definition is:**
@@ -390,45 +315,27 @@ policy denial.
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>permissive</code></td>
-<td>The <code>permissive</code> keyword.</td>
-</tr>
-<tr>
-<td><code>type_id</code></td>
-<td>The <code>type</code> identifier of the domain that will be run in permissive mode.</td>
-</tr>
-</tbody>
-</table>
+*permissive*
+
+The *permissive* keyword.
+
+*type_id*
+
+The *type* identifier of the domain that will be run in permissive mode.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>No</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| No | Yes | No |
**Examples:**
@@ -463,16 +370,13 @@ require {
permissive unconfined_t;
```
-<br>
-
-
-## `type_transition`
+## *type_transition*
The type_transition rule specifies the default type to be used for
domain transistion or object creation. Kernels from 2.6.39 with Policy
versions from 25 also support the 'name transition rule' extension. See the
[**Computing Security Contexts**](computing_security_contexts.md#computing-security-contexts)
-section for more details. Note than an `allow` rule must be used to authorise
+section for more details. Note than an *allow* rule must be used to authorise
the transition.
**The statement definitions are:**
@@ -486,59 +390,46 @@ however, this is only appropriate for the file classes:
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>type_transition</code></td>
-<td>The <code>type_transition</code> rule keyword.</td>
-</tr>
-<tr>
-<td><p><code>source_type</code></p>
-<p><code>target_type</code></p></td>
-<td><p>One or more source / target <code>type</code>, <code>typealias</code> or <code>attribute</code> identifiers. Multiple entries consist of a space separated list enclosed in braces '{}'. </p>
-<p>Entries can be excluded from the list by using the negative operator '-'.</p></td>
-</tr>
-<tr>
-<td><code>class</code></td>
-<td>One or more object classes. Multiple entries consist of a space separated list enclosed in braces '{}'.</td>
-</tr>
-<tr>
-<td><code>default_type</code></td>
-<td>A single <code>type</code> or <code>typealias</code> identifier that will become the default process <code>type</code> for a domain transition or the <code>type</code> for object transitions.</td>
-</tr>
-<tr>
-<td><code>object_name<code></td>
-<td>For the 'name transition' rule this is matched against the objects name (i.e. the last component of a path). If <code>object_name</code> exactly matches the object name, then use <code>default_type</code> for the <code>type</code>.</td>
-</tr>
-</tbody>
-</table>
+*type_transition*
+
+The *type_transition* rule keyword.
+
+*source_type*
+*target_type*
+
+One or more source / target *type*, *typealias* or *attribute* identifiers.
+Multiple entries consist of a space separated list enclosed in braces '{}'.
+Entries can be excluded from the list by using the negative operator '-'.
+
+*class*
+
+One or more object classes. Multiple entries consist of a space separated list
+enclosed in braces '{}'.
+
+*default_type*
+
+A single *type* or *typealias* identifier that will become the default process
+*type* for a domain transition or the *type* for object transitions.
+
+*object_name*
+
+For the 'name transition' rule this is matched against the objects name
+(i.e. the last component of a path). If *object_name* exactly matches the
+object name, then use *default_type* for the *type*.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | No |
**Example - Domain Transition:**
@@ -607,14 +498,12 @@ type_transition unconfined_t etc_t : file system_conf_t eric;
# an exact strcmp) it should be labeled system_conf_t.
```
-<br>
+## *type_change*
-## `type_change`
-
-The `type_change` rule specifies a default `type` when relabeling an
+The *type_change* rule specifies a default *type* when relabeling an
existing object. For example userspace SELinux-aware applications would
-use ***security_compute_relabel**(3)* and `type_change` rules in
-policy to determine the new context to be applied. Note that an `allow`
+use ***security_compute_relabel**(3)* and *type_change* rules in
+policy to determine the new context to be applied. Note that an *allow*
rule must be used to authorise access. See the
[**Computing Security Contexts**](computing_security_contexts.md#computing-security-contexts)
section for more details.
@@ -625,55 +514,38 @@ section for more details.
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>type_change</code></td>
-<td>The <code>type_change</code> rule keyword.</td>
-</tr>
-<tr>
-<td><p><code>source_type</code></p>
-<p><code>target_type</code></p></td>
-<td><p>One or more source / target <code>type</code>, <code>typealias</code> or <code>attribute</code> identifiers. Multiple entries consist of a space separated list enclosed in braces '{}'. </p>
-<p>Entries can be excluded from the list by using the negative operator '-'.</p></td>
-</tr>
-<tr>
-<td><code>class</code></td>
-<td>One or more object classes. Multiple entries consist of a space separated list enclosed in braces '{}'.</td>
-</tr>
-<tr>
-<td><code>change_type</code></td>
-<td>A single <code>type</code> or <code>typealias</code> identifier that will become the new <code>type</code>. </td>
-</tr>
-</tbody>
-</table>
+*type_change*
+
+The *type_change* rule keyword.
+
+*source_type*
+*target_type*
+
+One or more source / target *type*, *typealias* or *attribute* identifiers.
+Multiple entries consist of a space separated list enclosed in braces '{}'.
+Entries can be excluded from the list by using the negative operator '-'.
+
+*class*
+
+One or more object classes. Multiple entries consist of a space separated list
+enclosed in braces '{}'.
+
+*change_type*
+A single *type* or *typealias* identifier that will become the new *type*.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | No |
**Examples:**
@@ -694,15 +566,13 @@ type_change auditadm_t sysadm_devpts_t:chr_file auditadm_devpts_t;
type_change staff_t server_ptynode:chr_file staff_devpts_t;
```
-<br>
-
-## `type_member`
+## *type_member*
-The `type_member` rule specifies a default type when creating a
+The *type_member* rule specifies a default type when creating a
polyinstantiated object. For example a userspace SELinux-aware
application would use ***avc_compute_member**(3)* or
-***security_compute_member**(3)* with `type_member` rules in policy
-to determine the context to be applied. Note that an `allow` rule must
+***security_compute_member**(3)* with *type_member* rules in policy
+to determine the context to be applied. Note that an *allow* rule must
be used to authorise access. See the
[**Computing Security Contexts**](computing_security_contexts.md#computing-security-contexts)
section for more details.
@@ -713,55 +583,40 @@ section for more details.
**Where:**
-<table>
-<tbody>
-<tr>
-<td><code>type_member</code></td>
-<td>The <code>type_member</code> rule keyword.</td>
-</tr>
-<tr>
-<td><p><code>source_type</code></p>
-<p><code>target_type</code></p></td>
-<td><p>One or more source / target <code>type</code>, <code>typealias</code> or <code>attribute</code> identifiers. Multiple entries consist of a space separated list enclosed in braces '{}'. </p>
-<p>Entries can be excluded from the list by using the negative operator '-'.</p></td>
-</tr>
-<tr>
-<td><code>class</code></td>
-<td>One or more object classes. Multiple entries consist of a space separated list enclosed in braces '{}'.</td>
-</tr>
-<tr>
-<td><code>member_type</code></td>
-<td>A single <code>type</code> or <code>typealias</code> identifier that will become the polyinstantiated <code>type</code>. </td>
-</tr>
-</tbody>
-</table>
+*type_member*
+
+The *type_member* rule keyword.
+
+*source_type*
+*target_type*
+
+One or more source / target *type*, *typealias* or *attribute* identifiers.
+Multiple entries consist of a space separated list enclosed in braces '{}'.
+Entries can be excluded from the list by using the negative operator '-'.
+
+*class*
+
+One or more object classes. Multiple entries consist of a space separated list
+enclosed in braces '{}'.
+
+*member_type*
+
+A single *type* or *typealias* identifier that will become the polyinstantiated
+*type*.
**The statement is valid in:**
-<table style="text-align:center">
-<tbody>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Monolithic Policy</strong></td>
-<td><strong>Base Policy</strong></td>
-<td><strong>Module Policy</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>Yes</td>
-</tr>
-<tr style="background-color:#D3D3D3;">
-<td><strong>Conditional Policy <code>if</code> Statement</strong></td>
-<td><strong><code>optional</code> Statement</strong></td>
-<td><strong><code>require</code> Statement</strong></td>
-</tr>
-<tr>
-<td>Yes</td>
-<td>Yes</td>
-<td>No</td>
-</tr>
-</tbody>
-</table>
+Policy Type
+
+| Monolithic Policy | Base Policy | Module Policy |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | Yes |
+
+Conditional Policy Statements
+
+| *if* statement | *optional* Statement | *require* Statement |
+| ----------------------- | ----------------------- | ----------------------- |
+| Yes | Yes | No |
**Example:**
@@ -774,9 +629,6 @@ section for more details.
type_member sysadm_t user_home_dir_t:dir user_home_dir_t;
```
-
-<br>
-
<!-- %CUTHERE% -->
---
Signed-off-by: Paul Moore <paul@paul-moore.com> --- src/type_statements.md | 636 ++++++++++++++++++------------------------------ 1 file changed, 244 insertions(+), 392 deletions(-)