#

# Define m4 macros for the constraints

#

#

# Define the constraints

#

# constrain class_set perm_set expression ;

#

# validatetrans class_set expression ;

#

# expression : ( expression )

#	     | not expression

#	     | expression and expression

#	     | expression or expression

#	     | u1 op u2

#	     | r1 role_mls_op r2

#	     | t1 op t2

#	     | l1 role_mls_op l2

#	     | l1 role_mls_op h2

#	     | h1 role_mls_op l2

#	     | h1 role_mls_op h2

#	     | l1 role_mls_op h1

#	     | l2 role_mls_op h2

#	     | u1 op names

#	     | u2 op names

#	     | r1 op names

#	     | r2 op names

#	     | t1 op names

#	     | t2 op names

#	     | u3 op names (NOTE: this is only available for validatetrans)

#	     | r3 op names (NOTE: this is only available for validatetrans)

#	     | t3 op names (NOTE: this is only available for validatetrans)

#

# op : == | !=

# role_mls_op : == | != | eq | dom | domby | incomp

#

# names : name | { name_list }

# name_list : name | name_list name#

#

#

# Restrict the ability to transition to other users

# or roles to a few privileged types.

#

constrain process transition

	( u1 == u2 or ( t1 == privuser and t2 == userdomain )

ifdef(`crond.te', `

         or (t1 == crond_t and (t2 == user_crond_domain or u2 == system_u))

')

ifdef(`userhelper.te', 

	`or (t1 == userhelperdomain)')

	 or (t1 == priv_system_role and u2 == system_u )

        );

constrain process transition 

	( r1 == r2 or ( t1 == privrole and t2 == userdomain )

ifdef(`crond.te', `

         or (t1 == crond_t and t2 == user_crond_domain)

')

ifdef(`userhelper.te', 

	`or (t1 == userhelperdomain)')

ifdef(`postfix.te', `

ifdef(`direct_sysadm_daemon',

	`or (t1 == sysadm_mail_t and t2 == system_mail_t and r2 == system_r )')

')

	 or (t1 == priv_system_role and r2 == system_r )

        );

constrain process dyntransition

	( u1 == u2 and r1 == r2);

#

# Restrict the ability to label objects with other

# user identities to a few privileged types.

#

constrain dir_file_class_set { create relabelto relabelfrom } 

	( u1 == u2 or t1 == privowner );

constrain socket_class_set { create relabelto relabelfrom } 

	( u1 == u2 or t1 == privowner );