ifdef(`enable_mcs',`

#

# Define sensitivities 

#

# MCS is single-sensitivity.

gen_sens(1)

#

# Define the categories

#

# Generate declarations

gen_cats(mcs_num_cats)

#

# Each MCS level specifies a sensitivity and zero or more categories which may

# be associated with that sensitivity.

#

gen_levels(1,mcs_num_cats)

#

# Define the MCS policy

#

# mlsconstrain class_set perm_set expression ;

#

# mlsvalidatetrans 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 mlsvalidatetrans)

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

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

#

# op : == | !=

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

#

# names : name | { name_list }

# name_list : name | name_list name

#

#

# MCS policy for the file classes

#

# Constrain file access so that the high range of the process dominates

# the high range of the file.  We use the high range of the process so

# that processes can always simply run at s0.

#

# Note that getattr on files is always permitted.

#

mlsconstrain file { write setattr append unlink link rename ioctl lock execute relabelfrom }

	( h1 dom h2 );

mlsconstrain dir { create getattr setattr read write link unlink rename search add_name remove_name reparent rmdir lock ioctl }

	(( h1 dom h2 ) or ( t2 == domain ) or ( t1 == mlsfileread ));

# New filesystem object labels must be dominated by the relabeling subject

# clearance, also the objects are single-level.

mlsconstrain file { create relabelto }

	(( h1 dom h2 ) and ( l2 eq h2 ));

# At this time we do not restrict "ps" type operations via MCS.  This

# will probably change in future.

mlsconstrain file { read }

	(( h1 dom h2 ) or ( t2 == domain ) or ( t1 == mlsfileread ));

# new file labels must be dominated by the relabeling subject clearance

mlsconstrain { dir lnk_file chr_file blk_file sock_file fifo_file } { relabelfrom }

	( h1 dom h2 );

mlsconstrain { dir lnk_file chr_file blk_file sock_file fifo_file } { create relabelto }

	(( h1 dom h2 ) and ( l2 eq h2 ));

mlsconstrain process { transition dyntransition }

	(( h1 dom h2 ) or ( t1 == mcssetcats ));

mlsconstrain process { ptrace }

	(( h1 dom h2) or ( t1 == mcsptraceall ));

mlsconstrain process { sigkill sigstop }

	(( h1 dom h2 ) or ( t1 == mcskillall ));

#

# MCS policy for SELinux-enabled databases

#

# Any database object must be dominated by the relabeling subject

# clearance, also the objects are single-level.

mlsconstrain { db_database db_table db_procedure db_column db_blob } { create relabelto }

	(( h1 dom h2 ) and ( l2 eq h2 ));

mlsconstrain { db_tuple } { insert relabelto }

	(( h1 dom h2 ) and ( l2 eq h2 ));

# Access control for any database objects based on MCS rules.

mlsconstrain db_database { drop setattr relabelfrom access install_module load_module get_param set_param }

	( h1 dom h2 );

mlsconstrain db_table { drop setattr relabelfrom select update insert delete use }

	( h1 dom h2 );

mlsconstrain db_column { drop setattr relabelfrom select update insert use }

	( h1 dom h2 );

mlsconstrain db_tuple { relabelfrom select update delete use }

	( h1 dom h2 );

mlsconstrain db_procedure { execute install }

	( h1 dom h2 );

mlsconstrain db_blob { drop setattr relabelfrom read write }

	( h1 dom h2 );

') dnl end enable_mcs