policy/mcs

   1 ifdef(`enable_mcs',`
   2 #
   3 # Define sensitivities
   4 #
   5 # MCS is single-sensitivity.
   6
   7 gen_sens(1)
   8
   9 #
  10 # Define the categories
  11 #
  12 # Generate declarations
  13
  14 gen_cats(mcs_num_cats)
  15
  16 #
  17 # Each MCS level specifies a sensitivity and zero or more categories which may
  18 # be associated with that sensitivity.
  19 #
  20
  21 gen_levels(1,mcs_num_cats)
  22
  23 #
  24 # Define the MCS policy
  25 #
  26 # mlsconstrain class_set perm_set expression ;
  27 #
  28 # mlsvalidatetrans class_set expression ;
  29 #
  30 # expression : ( expression )
  31 #            | not expression
  32 #            | expression and expression
  33 #            | expression or expression
  34 #            | u1 op u2
  35 #            | r1 role_mls_op r2
  36 #            | t1 op t2
  37 #            | l1 role_mls_op l2
  38 #            | l1 role_mls_op h2
  39 #            | h1 role_mls_op l2
  40 #            | h1 role_mls_op h2
  41 #            | l1 role_mls_op h1
  42 #            | l2 role_mls_op h2
  43 #            | u1 op names
  44 #            | u2 op names
  45 #            | r1 op names
  46 #            | r2 op names
  47 #            | t1 op names
  48 #            | t2 op names
  49 #            | u3 op names (NOTE: this is only available for mlsvalidatetrans)
  50 #            | r3 op names (NOTE: this is only available for mlsvalidatetrans)
  51 #            | t3 op names (NOTE: this is only available for mlsvalidatetrans)
  52 #
  53 # op : == | !=
  54 # role_mls_op : == | != | eq | dom | domby | incomp
  55 #
  56 # names : name | { name_list }
  57 # name_list : name | name_list name
  58 #
  59
  60 #
  61 # MCS policy for the file classes
  62 #
  63 # Constrain file access so that the high range of the process dominates
  64 # the high range of the file.  We use the high range of the process so
  65 # that processes can always simply run at s0.
  66 #
  67 # Note:
  68 #  - getattr on dirs/files is not constrained.
  69 #  - /proc/pid operations are not constrained.
  70
  71 mlsconstrain file { read ioctl lock execute execute_no_trans }
  72         (( h1 dom h2 ) or ( t1 == mcsreadall ) or ( t2 == domain ));
  73
  74 mlsconstrain file { write setattr append unlink link rename }
  75         (( h1 dom h2 ) or ( t1 == mcswriteall ) or ( t2 == domain ));
  76
  77 mlsconstrain dir { search read ioctl lock }
  78         (( h1 dom h2 ) or ( t1 == mcsreadall ) or ( t2 == domain ));
  79
  80 mlsconstrain dir { write setattr append unlink link rename add_name remove_name }
  81         (( h1 dom h2 ) or ( t1 == mcswriteall ) or ( t2 == domain ));
  82
  83 # New filesystem object labels must be dominated by the relabeling subject
  84 # clearance, also the objects are single-level.
  85 mlsconstrain file { create relabelto }
  86         (( h1 dom h2 ) and ( l2 eq h2 ));
  87
  88 # new file labels must be dominated by the relabeling subject clearance
  89 mlsconstrain { dir lnk_file chr_file blk_file sock_file fifo_file file } { relabelfrom }
  90         ( h1 dom h2 );
  91
  92 mlsconstrain { dir lnk_file chr_file blk_file sock_file fifo_file file } { create relabelto }
  93         (( h1 dom h2 ) and ( l2 eq h2 ));
  94
  95 mlsconstrain process { transition dyntransition }
  96         (( h1 dom h2 ) or ( t1 == mcssetcats ));
  97
  98 mlsconstrain process { ptrace }
  99         (( h1 dom h2) or ( t1 == mcsptraceall ));
 100
 101 mlsconstrain process { sigkill sigstop }
 102         (( h1 dom h2 ) or ( t1 == mcskillall ));
 103
 104 #
 105 # MCS policy for SELinux-enabled databases
 106 #
 107
 108 # Any database object must be dominated by the relabeling subject
 109 # clearance, also the objects are single-level.
 110 mlsconstrain { db_database db_table db_procedure db_column db_blob } { create relabelto }
 111         (( h1 dom h2 ) and ( l2 eq h2 ));
 112
 113 mlsconstrain { db_tuple } { insert relabelto }
 114         (( h1 dom h2 ) and ( l2 eq h2 ));
 115
 116 # Access control for any database objects based on MCS rules.
 117 mlsconstrain db_database { drop getattr setattr relabelfrom access install_module load_module get_param set_param }
 118         ( h1 dom h2 );
 119
 120 mlsconstrain db_table { drop getattr setattr relabelfrom select update insert delete use lock }
 121         ( h1 dom h2 );
 122
 123 mlsconstrain db_column { drop getattr setattr relabelfrom select update insert use }
 124         ( h1 dom h2 );
 125
 126 mlsconstrain db_tuple { relabelfrom select update delete use }
 127         ( h1 dom h2 );
 128
 129 mlsconstrain db_procedure { drop getattr setattr execute install }
 130         ( h1 dom h2 );
 131
 132 mlsconstrain db_blob { drop getattr setattr relabelfrom read write import export }
 133         ( h1 dom h2 );
 134
 135 ') dnl end enable_mcs