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selinux/secilc/docs/cil_constraint_statements.xml
Yuli Khodorkovskiy 77779d2ca5 libsepol/cil: Add userattribute{set} functionality 
This adds a userattribute statement that may be used in userroles and
constraints. The syntax is the same as typeattributset.

Also, disallow roleattributes where roles are accepted in contexts.

Specify a userattribute

    (userattribute foo)

Add users to the set foo

    (userattributeset foo (u1 u2))

Signed-off-by: Yuli Khodorkovskiy <ykhodorkovskiy@tresys.com>
Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>
2015-09-11 09:07:46 -04:00

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<!-- Common Interface Language (CIL) Reference Guide -->
<!-- constraint_statements.xml -->
<sect1>
<title>Constraint Statements</title>
<sect2 id="constrain">
<title>constrain</title>
<para>Enable constraints to be placed on the specified permissions of the object class based on the source and target security context components.</para>
<para><emphasis role="bold">Statement definition:</emphasis></para>
<programlisting><![CDATA[(constrain classpermissionset_id ... expression | expr ...)]]></programlisting>
<para><emphasis role="bold">Where:</emphasis></para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colwidth="2.25 *"/>
<colspec colwidth="6 *"/>
<tbody>
<row>
<entry>
<para><literal>constrain</literal></para>
</entry>
<entry>
<para>The <literal>constrain</literal> keyword.</para>
</entry>
</row>
<row>
<entry>
<para><literal>classpermissionset_id</literal></para>
</entry>
<entry>
<para>A single named or anonymous <literal><link linkend="classpermissionset">classpermissionset</link></literal> or a single set of <literal><link linkend="classmap">classmap</link></literal>/<literal><link linkend="classmapping">classmapping</link></literal> identifiers.</para>
</entry>
</row>
<row>
<entry>
<para><literal>expression</literal></para>
</entry>
<entry>
<para>There must be one constraint <literal>expression</literal> or one or more <literal>expr</literal>'s. The expression consists of an operator and two operands as follows:</para>
<simpara><literal> (op u1 u2)</literal></simpara>
<simpara><literal> (role_op r1 r2)</literal></simpara>
<simpara><literal> (op t1 t2)</literal></simpara>
<simpara><literal> (op u1 user_id)</literal></simpara>
<simpara><literal> (op u2 user_id)</literal></simpara>
<simpara><literal> (op r1 role_id)</literal></simpara>
<simpara><literal> (op r2 role_id)</literal></simpara>
<simpara><literal> (op t1 type_id)</literal></simpara>
<simpara><literal> (op t2 type_id)</literal></simpara>
<simpara>where:</simpara>
<simpara><literal> u1, r1, t1 = Source context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara><literal> u2, r2, t2 = Target context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara>and:</simpara>
<simpara><literal> op : eq neq</literal></simpara>
<simpara><literal> role_op : eq neq dom domby incomp</literal></simpara>
<simpara><literal> user_id : A single <link linkend="user">user</link> or <link linkend="userattribute">userattribute</link> identifier.</literal></simpara>
<simpara><literal> role_id : A single <link linkend="role">role</link> or <link linkend="roleattribute">roleattribute</link> identifier.</literal></simpara>
<simpara><literal> type_id : A single <link linkend="type">type</link>, <link linkend="typealias">typealias</link> or <link linkend="typeattribute">typeattribute</link> identifier.</literal></simpara>
</entry>
</row>
<row>
<entry>
<para><literal>expr</literal></para>
</entry>
<entry>
<para>Zero or more <literal>expr</literal>'s, the valid operators and syntax are:</para>
<simpara><literal> (and expression expression)</literal></simpara>
<simpara><literal> (or expression expression)</literal></simpara>
<simpara><literal> (not expression)</literal></simpara>
</entry>
</row>
</tbody></tgroup>
</informaltable>
<para><emphasis role="bold">Examples:</emphasis></para>
<para>Two constrain statements are shown with their equivalent kernel policy language statements:</para>
<programlisting><![CDATA[
;; constrain { file } { write }
;; (( t1 == unconfined.process ) and ( t2 == unconfined.object ) or ( r1 eq r2 ));
(constrain (file (write))
(or
(and
(eq t1 unconfined.process)
(eq t2 unconfined.object)
)
(eq r1 r2)
)
)
;; constrain { file } { read }
;; (not( t1 == unconfined.process ) and ( t2 == unconfined.object ) or ( r1 eq r2 ));
(constrain (file (read))
(not
(or
(and
(eq t1 unconfined.process)
(eq t2 unconfined.object)
)
(eq r1 r2)
)
)
)]]>
</programlisting>
</sect2>
<sect2 id="validatetrans">
<title>validatetrans</title>
<para>The <literal>validatetrans</literal> statement is only used for <literal>file</literal> related object classes where it is used to control the ability to change the objects security context based on old, new and the current process security context.</para>
<para><emphasis role="bold">Statement definition:</emphasis></para>
<programlisting><![CDATA[(validatetrans class_id expression | expr ...)]]>
</programlisting>
<para><emphasis role="bold">Where:</emphasis></para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colwidth="2 *"/>
<colspec colwidth="6 *"/>
<tbody>
<row>
<entry>
<para><literal>validatetrans</literal></para>
</entry>
<entry>
<para>The <literal>validatetrans</literal> keyword.</para>
</entry>
</row>
<row>
<entry>
<para><literal>class_id</literal></para>
</entry>
<entry>
<para>A single previously declared <literal><link linkend="class">class</link></literal> or <literal><link linkend="classmap">classmap</link></literal> identifier.</para>
</entry>
</row>
<row>
<entry>
<para><literal>expression</literal></para>
</entry>
<entry>
<para>There must be one constraint <literal>expression</literal> or one or more <literal>expr</literal>'s. The expression consists of an operator and two operands as follows:</para>
<simpara><literal> (op u1 u2)</literal></simpara>
<simpara><literal> (role_op r1 r2)</literal></simpara>
<simpara><literal> (op t1 t2)</literal></simpara>
<simpara><literal> (op u1 user_id)</literal></simpara>
<simpara><literal> (op u2 user_id)</literal></simpara>
<simpara><literal> (op u3 user_id)</literal></simpara>
<simpara><literal> (op r1 role_id)</literal></simpara>
<simpara><literal> (op r2 role_id)</literal></simpara>
<simpara><literal> (op r3 role_id)</literal></simpara>
<simpara><literal> (op t1 type_id)</literal></simpara>
<simpara><literal> (op t2 type_id)</literal></simpara>
<simpara><literal> (op t3 type_id)</literal></simpara>
<simpara>where:</simpara>
<simpara><literal> u1, r1, t1 = Old context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara><literal> u2, r2, t2 = New context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara><literal> u3, r3, t3 = Process context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara>and:</simpara>
<simpara><literal> op : eq neq</literal></simpara>
<simpara><literal> role_op : eq neq dom domby incomp</literal></simpara>
<simpara><literal> user_id : A single <link linkend="user">user</link> or <link linkend="userattribute">userattribute</link> identifier.</literal></simpara>
<simpara><literal> role_id : A single <link linkend="role">role</link> or <link linkend="roleattribute">roleattribute</link> identifier.</literal></simpara>
<simpara><literal> type_id : A single <link linkend="type">type</link>, <link linkend="typealias">typealias</link> or <link linkend="typeattribute">typeattribute</link> identifier.</literal></simpara>
</entry>
</row>
<row>
<entry>
<para><literal>expr</literal></para>
</entry>
<entry>
<para>Zero or more <literal>expr</literal>'s, the valid operators and syntax are:</para>
<simpara><literal> (and expression expression)</literal></simpara>
<simpara><literal> (or expression expression)</literal></simpara>
<simpara><literal> (not expression)</literal></simpara>
</entry>
</row>
</tbody></tgroup>
</informaltable>
<para><emphasis role="bold">Example:</emphasis></para>
<para>A validate transition statement with the equivalent kernel policy language statement:</para>
<programlisting><![CDATA[
; validatetrans { file } ( t1 == unconfined.process );
(validatetrans file (eq t1 unconfined.process))]]>
</programlisting>
</sect2>
<sect2 id="mlsconstrain">
<title>mlsconstrain</title>
<para>Enable MLS constraints to be placed on the specified permissions of the object class based on the source and target security context components.</para>
<para><emphasis role="bold">Statement definition:</emphasis></para>
<programlisting><![CDATA[(mlsconstrain classpermissionset_id ... expression | expr ...)]]></programlisting>
<para><emphasis role="bold">Where:</emphasis></para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colwidth="2.25 *"/>
<colspec colwidth="6 *"/>
<tbody>
<row>
<entry>
<para><literal>mlsconstrain</literal></para>
</entry>
<entry>
<para>The <literal>mlsconstrain</literal> keyword.</para>
</entry>
</row>
<row>
<entry>
<para><literal>classpermissionset_id</literal></para>
</entry>
<entry>
<para>A single named or anonymous <literal><link linkend="classpermissionset">classpermissionset</link></literal> or a single set of <literal><link linkend="classmap">classmap</link></literal>/<literal><link linkend="classmapping">classmapping</link></literal> identifiers.</para>
</entry>
</row>
<row>
<entry>
<para><literal>expression</literal></para>
</entry>
<entry>
<para>There must be one constraint <literal>expression</literal> or one or more <literal>expr</literal>'s. The expression consists of an operator and two operands as follows:</para>
<simpara><literal> (op u1 u2)</literal></simpara>
<simpara><literal> (mls_role_op r1 r2)</literal></simpara>
<simpara><literal> (op t1 t2)</literal></simpara>
<simpara><literal> (mls_role_op l1 l2)</literal></simpara>
<simpara><literal> (mls_role_op l1 h2)</literal></simpara>
<simpara><literal> (mls_role_op h1 l2)</literal></simpara>
<simpara><literal> (mls_role_op h1 h2)</literal></simpara>
<simpara><literal> (mls_role_op l1 h1)</literal></simpara>
<simpara><literal> (mls_role_op l2 h2)</literal></simpara>
<simpara><literal> (op u1 user_id)</literal></simpara>
<simpara><literal> (op u2 user_id)</literal></simpara>
<simpara><literal> (op r1 role_id)</literal></simpara>
<simpara><literal> (op r2 role_id)</literal></simpara>
<simpara><literal> (op t1 type_id)</literal></simpara>
<simpara><literal> (op t2 type_id)</literal></simpara>
<simpara>where:</simpara>
<simpara><literal> u1, r1, t1, l1, h1 = Source context: <link linkend="user">user</link>, <link linkend="role">role</link>, <link linkend="type">type</link>, <link linkend="level">low level</link> or <link linkend="level">high level</link></literal></simpara>
<simpara><literal> u2, r2, t2, l2, h2 = Target context: <link linkend="user">user</link>, <link linkend="role">role</link>, <link linkend="type">type</link>, <link linkend="level">low level</link> or <link linkend="level">high level</link></literal></simpara>
<simpara>and:</simpara>
<simpara><literal> op : eq neq</literal></simpara>
<simpara><literal> mls_role_op : eq neq dom domby incomp</literal></simpara>
<simpara><literal> user_id : A single <link linkend="user">user</link> or <link linkend="userattribute">userattribute</link> identifier.</literal></simpara>
<simpara><literal> role_id : A single <link linkend="role">role</link> or <link linkend="roleattribute">roleattribute</link> identifier.</literal></simpara>
<simpara><literal> type_id : A single <link linkend="type">type</link>, <link linkend="typealias">typealias</link> or <link linkend="typeattribute">typeattribute</link> identifier.</literal></simpara>
</entry>
</row>
<row>
<entry>
<para><literal>expr</literal></para>
</entry>
<entry>
<para>Zero or more <literal>expr</literal>'s, the valid operators and syntax are:</para>
<simpara><literal> (and expression expression)</literal></simpara>
<simpara><literal> (or expression expression)</literal></simpara>
<simpara><literal> (not expression)</literal></simpara>
</entry>
</row>
</tbody></tgroup>
</informaltable>
<para><emphasis role="bold">Example:</emphasis></para>
<para>An MLS constrain statement with the equivalent kernel policy language statement:</para>
<programlisting><![CDATA[
;; mlsconstrain { file } { open }
;; (( l1 eq l2 ) and ( u1 == u2 ) or ( r1 != r2 ));
(mlsconstrain (file (open))
(or
(and
(eq l1 l2)
(eq u1 u2)
)
(neq r1 r2)
)
)]]>
</programlisting>
</sect2>
<sect2 id="mlsvalidatetrans">
<title>mlsvalidatetrans</title>
<para>The <literal>mlsvalidatetrans</literal> statement is only used for <literal>file</literal> related object classes where it is used to control the ability to change the objects security context based on old, new and the current process security context.</para>
<para><emphasis role="bold">Statement definition:</emphasis></para>
<programlisting><![CDATA[(mlsvalidatetrans class_id expression | expr ...)]]>
</programlisting>
<para><emphasis role="bold">Where:</emphasis></para>
<informaltable frame="all">
<tgroup cols="2">
<colspec colwidth="2 *"/>
<colspec colwidth="6 *"/>
<tbody>
<row>
<entry>
<para><literal>mlsvalidatetrans</literal></para>
</entry>
<entry>
<para>The <literal>mlsvalidatetrans</literal> keyword.</para>
</entry>
</row>
<row>
<entry>
<para><literal>class_id</literal></para>
</entry>
<entry>
<para>A single previously declared <literal><link linkend="class">class</link></literal> or <literal><link linkend="classmap">classmap</link></literal> identifier.</para>
</entry>
</row>
<row>
<entry>
<para><literal>expression</literal></para>
</entry>
<entry>
<para>There must be one constraint <literal>expression</literal> or one or more <literal>expr</literal>'s. The expression consists of an operator and two operands as follows:</para>
<simpara><literal> (op u1 u2)</literal></simpara>
<simpara><literal> (mls_role_op r1 r2)</literal></simpara>
<simpara><literal> (op t1 t2)</literal></simpara>
<simpara><literal> (mls_role_op l1 l2)</literal></simpara>
<simpara><literal> (mls_role_op l1 h2)</literal></simpara>
<simpara><literal> (mls_role_op h1 l2)</literal></simpara>
<simpara><literal> (mls_role_op h1 h2)</literal></simpara>
<simpara><literal> (mls_role_op l1 h1)</literal></simpara>
<simpara><literal> (mls_role_op l2 h2)</literal></simpara>
<simpara><literal> (op u1 user_id)</literal></simpara>
<simpara><literal> (op u2 user_id)</literal></simpara>
<simpara><literal> (op u3 user_id)</literal></simpara>
<simpara><literal> (op r1 role_id)</literal></simpara>
<simpara><literal> (op r2 role_id)</literal></simpara>
<simpara><literal> (op r3 role_id)</literal></simpara>
<simpara><literal> (op t1 type_id)</literal></simpara>
<simpara><literal> (op t2 type_id)</literal></simpara>
<simpara><literal> (op t3 type_id)</literal></simpara>
<simpara>where:</simpara>
<simpara><literal> u1, r1, t1, l1, h1 = Source context: <link linkend="user">user</link>, <link linkend="role">role</link>, <link linkend="type">type</link>, <link linkend="level">low level</link> or <link linkend="level">high level</link></literal></simpara>
<simpara><literal> u2, r2, t2, l2, h2 = Target context: <link linkend="user">user</link>, <link linkend="role">role</link>, <link linkend="type">type</link>, <link linkend="level">low level</link> or <link linkend="level">high level</link></literal></simpara>
<simpara><literal> u3, r3, t3 = Process context: <link linkend="user">user</link>, <link linkend="role">role</link> or <link linkend="type">type</link></literal></simpara>
<simpara>and:</simpara>
<simpara><literal> op : eq neq</literal></simpara>
<simpara><literal> mls_role_op : eq neq dom domby incomp</literal></simpara>
<simpara><literal> user_id : A single <link linkend="user">user</link> or <link linkend="userattribute">userattribute</link> identifier.</literal></simpara>
<simpara><literal> role_id : A single <link linkend="role">role</link> or <link linkend="roleattribute">roleattribute</link> identifier.</literal></simpara>
<simpara><literal> type_id : A single <link linkend="type">type</link>, <link linkend="typealias">typealias</link> or <link linkend="typeattribute">typeattribute</link> identifier.</literal></simpara>
</entry>
</row>
<row>
<entry>
<para><literal>expr</literal></para>
</entry>
<entry>
<para>Zero or more <literal>expr</literal>'s, the valid operators and syntax are:</para>
<simpara><literal> (and expression expression)</literal></simpara>
<simpara><literal> (or expression expression)</literal></simpara>
<simpara><literal> (not expression)</literal></simpara>
</entry>
</row>
</tbody></tgroup>
</informaltable>
<para><emphasis role="bold">Example:</emphasis></para>
<para>An MLS validate transition statement with the equivalent kernel policy language statement:</para>
<programlisting><![CDATA[
;; mlsvalidatetrans { file } ( l1 domby h2 );
(mlsvalidatetrans file (domby l1 h2))]]>
</programlisting>
</sect2>
</sect1>
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