forked from extern/shorewall_code
Finish revision of action processing
This commit is contained in:
Tom Eastep
parent
8218cb3444
commit
bdc3ca16a4
@ -637,6 +637,10 @@ sub compiler {
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#
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validate_policy;
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#
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# Process default actions
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#
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process_actions2;
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#
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# N O T R A C K
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# (Produces no output to the compiled script)
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#
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@ -761,7 +765,6 @@ sub compiler {
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#
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# Post-rules action processing.
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#
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process_actions2;
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process_actions3;
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#
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# MACLIST Filtration again
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@ -58,9 +58,10 @@ our @builtins;
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#
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our $rule_commands = { COMMENT => 0, FORMAT => 2 };
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use constant { MAX_MACRO_NEST_LEVEL => 5 };
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use constant { MAX_MACRO_NEST_LEVEL => 5 , MAX_ACTION_NEST_LEVEL => 5 };
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our $macro_nest_level;
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our $action_nest_level;
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#
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# Rather than initializing globals in an INIT block or during declaration,
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@ -73,10 +74,10 @@ our $macro_nest_level;
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# able to re-initialize its dependent modules' state.
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#
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sub initialize( $ ) {
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$family = shift;
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%macros = ();
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$macro_nest_level = 0;
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$action_nest_level = 0;
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if ( $family == F_IPV4 ) {
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@builtins = qw/dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP forwardUPnP Limit/;
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@ -248,17 +249,15 @@ sub map_old_actions( $ ) {
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# to the target table (%Shorewall::Chains::targets) and actions table, then ${SHAREDIR}/actions.std and
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# ${CONFDIR}/actions are scanned (in that order). For each action:
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#
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# a) The related action definition file is located and scanned.
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# b) Forward and unresolved action references are trapped as errors.
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# c) A dependency graph is created using the 'requires' field in the 'actions' table.
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# a) The related action definition file is located.
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# a) The action is added to the target table
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#
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# As the rules file is scanned, each action[:level[:tag]] is merged onto the 'usedactions' hash. When an <action>
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# is merged into the hash, its action chain is created. Where logging is specified, a chain with the name
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# %<action>n is used where the <action> name is truncated on the right where necessary to ensure that the total
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# length of the chain name does not exceed 30 characters.
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# The second phase (process_actions2) occurs after the policy file is scanned. Each default action's file
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# is processed by process_action2(). That function recursively processes action files up the action
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# invocation tree, adding to the %usedactions hash as each new action is discovered.
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#
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# The second phase (process_actions2) occurs after the rules file is scanned. The transitive closure of
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# %usedactions is generated; again, as new actions are merged into the hash, their action chains are created.
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# During rules file processing, process_action2() is called when a new action:level:tag:params is encountered.
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# Again, each new such tupple is entered into the %usedactions hash.
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#
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# The final phase (process_actions3) traverses the keys of %usedactions populating each chain appropriately
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# by reading the related action definition file and creating rules. Note that a given action definition file is
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@ -267,7 +266,7 @@ sub map_old_actions( $ ) {
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sub process_rule_common ( $$$$$$$$$$$$$$$$ );
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sub process_action1( $ ) {
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sub process_action2( $ ) {
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my $wholeaction = shift;
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my ( $action , $level, $tag, $param ) = split /:/, $wholeaction;
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my $actionfile = find_file "action.$action";
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@ -276,6 +275,8 @@ sub process_action1( $ ) {
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progress_message2 " Pre-processing $actionfile...";
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fatal_error "Actions nested too deeply" if ++$action_nest_level > MAX_ACTION_NEST_LEVEL;
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push_open( $actionfile );
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while ( read_a_line ) {
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@ -306,6 +307,8 @@ sub process_action1( $ ) {
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}
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pop_open;
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--$action_nest_level;
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}
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sub process_actions1() {
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@ -343,8 +346,6 @@ sub process_actions1() {
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my $actionfile = find_file "action.$action";
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fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
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process_action1 normalize_action_name $action;
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}
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}
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}
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@ -375,27 +376,12 @@ sub merge_action_levels( $$ ) {
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}
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sub process_actions2 () {
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progress_message2 'Generating Transitive Closure of Used-action List...';
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progress_message2 "Pre-processing default actions...";
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my $changed = 1;
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my $passes = 0;
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while ( $changed ) {
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$changed = 0;
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$passes++;
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for my $target (keys %usedactions) {
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my ( $action, $level, $tag, $param ) = split ':', $target;
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my $actionref = $actions{$action};
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assert( $actionref );
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for my $action1 ( keys %{$actionref->{requires}} ) {
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my $action2 = merge_action_levels( $target, $action1 );
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$changed = 1 if use_action( $action2 );
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for my $action ( keys %usedactions ) {
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my ( $basic_action, undef, undef, undef ) = split /:/, $action;
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process_action2( $action ) unless $targets{$basic_action} & BUILTIN;
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}
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}
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}
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progress_message2 "Transitive Closure generated in $passes passes";
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}
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#
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@ -603,6 +589,7 @@ sub process_actions3 () {
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'Limit' => \&Limit, );
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while ( my ( $wholeaction, $chainref ) = each %usedactions ) {
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assert( $chainref->{name} );
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my ( $action, $level, $tag, $param ) = split /:/, $wholeaction;
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if ( $targets{$action} & BUILTIN ) {
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@ -734,7 +721,7 @@ sub process_macro ( $$$$$$$$$$$$$$$$$ ) {
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#
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sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
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my ( $chainref, #reference to Action Chain if we are being called from process_action3()
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# if defined, we are being called from process_action1() and this is the name of the action
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# if defined, we are being called from process_action2() and this is the name of the action
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$target,
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$current_param,
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$source,
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@ -755,7 +742,7 @@ sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
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my ( $basictarget, $param ) = get_target_param $action;
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my $rule = '';
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my $optimize = $wildcard ? ( $basictarget =~ /!$/ ? 0 : $config{OPTIMIZE} & 1 ) : 0;
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my $inaction1;
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my $inaction1 = '';
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my $inaction3;
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my $normalized_target;
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my $normalized_action;
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@ -840,13 +827,14 @@ sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
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#
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$normalized_target = normalize_action( $basictarget, $loglevel, $param );
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if ( $inaction1 ) {
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fatal_error "An action may not invoke itself" if $basictarget eq $inaction1;
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add_requiredby( $normalized_target , $inaction1 );
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} else {
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if ( $inaction3 ) {
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if ( my $ref = use_action( $normalized_target ) ) {
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new_nat_chain $ref->{name} if $actiontype & ( NATRULE | NONAT | NATONLY );
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new_nat_chain $ref->{name} if ( $actiontype = $targets{$basictarget} ) & NATRULE;
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}
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} else {
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fatal_error "An action may not invoke itself" if $basictarget eq $inaction1;
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process_action2( $normalized_target ) if use_action( $normalized_target ) && ! ( $actiontype & BUILTIN );
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$actiontype = $targets{$basictarget};
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}
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}
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