selinux-policy/refpolicy/policy/constraints

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#
# Define m4 macros for the constraints
#
#
# Define the constraints
#
# constrain class_set perm_set expression ;
#
# expression : ( expression )
# | not expression
# | expression and expression
# | expression or expression
# | u1 op u2
# | r1 role_op r2
# | t1 op t2
# | u1 op names
# | u2 op names
# | r1 op names
# | r2 op names
# | t1 op names
# | t2 op names
#
# op : == | !=
# role_op : == | != | eq | dom | domby | incomp
#
# names : name | { name_list }
# name_list : name | name_list name
#
#
# SELinux process identity change constraint:
#
constrain process transition
( u1 == u2 or ( t1 == can_change_process_identity and t2 == userdomain )
ifdef(`crond.te', `
or (t1 == crond_t and (t2 == user_crond_domain or u2 == system_u))
')
ifdef(`userhelper.te',
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`or (t1 == userhelperdomain)
')
ifdef(`TODO',`
or (t1 == priv_system_role and u2 == system_u )
') dnl end TODO
);
#
# SELinux process role change constraint:
#
constrain process transition
( r1 == r2 or ( t1 == can_change_process_role and t2 == userdomain )
ifdef(`crond.te', `
or (t1 == crond_t and t2 == user_crond_domain)
')
ifdef(`userhelper.te',
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`or (t1 == userhelperdomain)
')
ifdef(`postfix.te', `
ifdef(`direct_sysadm_daemon',
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`or (t1 == sysadm_mail_t and t2 == system_mail_t and r2 == system_r )
')
')
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ifdef(`TODO',`
or (t1 == priv_system_role and r2 == system_r )
') dnl end TODO
);
#
# SELinux dynamic transition constraint:
#
constrain process dyntransition
( u1 == u2 and r1 == r2);
#
# SElinux object identity change constraint:
#
constrain dir_file_class_set { create relabelto relabelfrom }
( u1 == u2 or t1 == can_change_object_identity );
constrain socket_class_set { create relabelto relabelfrom }
( u1 == u2 or t1 == can_change_object_identity );