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Runtime Port Variables
Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep
parent
4cf60258af
commit
57f7cb4f3c
@ -32,6 +32,7 @@ require Exporter;
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use Scalar::Util 'reftype';
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use Digest::SHA qw(sha1_hex);
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use File::Basename;
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use Socket;
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::Zones;
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use Shorewall::IPAddrs;
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@ -137,6 +138,12 @@ our %EXPORT_TAGS = (
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ALL_COMMANDS
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NOT_RESTORE
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validate_port
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validate_portpair
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validate_portpair1
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validate_port_list
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expand_port_range
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PREROUTING
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INPUT
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FORWARD
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@ -509,6 +516,7 @@ our $idiotcount1;
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our $hashlimitset;
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our $global_variables;
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our %address_variables;
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our %port_variables;
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our $ipset_rules;
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#
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@ -784,6 +792,7 @@ sub initialize( $$$ ) {
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%interfaceacasts = ();
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%interfacegateways = ();
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%address_variables = ();
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%port_variables = ();
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$global_variables = 0;
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$idiotcount = 0;
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@ -819,6 +828,190 @@ sub initialize( $$$ ) {
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#
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}
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sub record_runtime_port( $ ) {
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my ( $variable ) = @_;
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if ( $variable =~ /^{([a-zA-Z_]\w*)}$/ ) {
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fatal_error "Variable %variable is already used as an address variable" if $address_variables{$1};
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$port_variables{$1} = 1;
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} else {
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fatal_error( "Invalid port variable (%$variable)" );
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}
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"\$$variable";
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}
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sub validate_port( $$ ) {
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my ($proto, $port) = @_;
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my $value;
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if ( $port =~ /^(\d+)$/ || $port =~ /^0x/ ) {
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$port = numeric_value $port;
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return $port if defined $port && $port && $port <= 65535;
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} elsif ( $port =~ /^%(.*)/ ) {
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$value = record_runtime_port( $1 );
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} else {
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$proto = proto_name $proto if $proto =~ /^(\d+)$/;
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$value = getservbyname( $port, $proto );
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}
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return $value if defined $value;
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fatal_error "The separator for a port range is ':', not '-' ($port)" if $port =~ /^\d+-\d+$/;
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fatal_error "Invalid/Unknown $proto port/service ($_[1])" unless defined $value;
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}
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sub validate_portpair( $$ ) {
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my ($proto, $portpair) = @_;
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my $what;
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my $pair = $portpair;
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#
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# Accept '-' as a port-range separator
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#
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$pair =~ tr/-/:/ if $pair =~ /^[-0-9]+$/;
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fatal_error "Invalid port range ($portpair)" if $pair =~ tr/:/:/ > 1;
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$pair = "0$pair" if substr( $pair, 0, 1 ) eq ':';
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$pair = "${pair}65535" if substr( $pair, -1, 1 ) eq ':';
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my @ports = split /:/, $pair, 2;
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my $protonum = resolve_proto( $proto ) || 0;
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$_ = validate_port( $protonum, $_) for grep $_, @ports;
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if ( @ports == 2 ) {
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$what = 'port range';
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fatal_error "Invalid port range ($portpair)" unless $ports[0] < $ports[1];
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} else {
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$what = 'port';
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}
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fatal_error "Using a $what ( $portpair ) requires PROTO TCP, UDP, UDPLITE, SCTP or DCCP" unless
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defined $protonum && ( $protonum == TCP ||
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$protonum == UDP ||
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$protonum == UDPLITE ||
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$protonum == SCTP ||
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$protonum == DCCP );
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join ':', @ports;
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}
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sub validate_portpair1( $$ ) {
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my ($proto, $portpair) = @_;
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my $what;
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fatal_error "Invalid port range ($portpair)" if $portpair =~ tr/-/-/ > 1;
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$portpair = "1$portpair" if substr( $portpair, 0, 1 ) eq ':';
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$portpair = "${portpair}65535" if substr( $portpair, -1, 1 ) eq ':';
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my @ports = split /-/, $portpair, 2;
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my $protonum = resolve_proto( $proto ) || 0;
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$_ = validate_port( $protonum, $_) for grep $_, @ports;
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if ( @ports == 2 ) {
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$what = 'port range';
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fatal_error "Invalid port range ($portpair)" unless $ports[0] && $ports[0] < $ports[1];
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} else {
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$what = 'port';
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fatal_error 'Invalid port number (0)' unless $portpair;
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}
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fatal_error "Using a $what ( $portpair ) requires PROTO TCP, UDP, SCTP or DCCP" unless
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defined $protonum && ( $protonum == TCP ||
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$protonum == UDP ||
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$protonum == SCTP ||
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$protonum == DCCP );
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join '-', @ports;
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}
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sub validate_port_list( $$ ) {
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my $result = '';
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my ( $proto, $list ) = @_;
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my @list = split_list( $list, 'port' );
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if ( @list > 1 && $list =~ /[:-]/ ) {
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require_capability( 'XMULTIPORT' , 'Port ranges in a port list', '' );
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}
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$proto = proto_name $proto;
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for ( @list ) {
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my $value = validate_portpair( $proto , $_ );
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$result = $result ? join ',', $result, $value : $value;
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}
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$result;
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}
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#
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# Expands a port range into a minimal list of ( port, mask ) pairs.
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# Each port and mask are expressed as 4 hex nibbles without a leading '0x'.
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#
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# Example:
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#
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# DB<3> @foo = Shorewall::IPAddrs::expand_port_range( 6, '110:' ); print "@foo\n"
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# 006e fffe 0070 fff0 0080 ff80 0100 ff00 0200 fe00 0400 fc00 0800 f800 1000 f000 2000 e000 4000 c000 8000 8000
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#
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sub expand_port_range( $$ ) {
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my ( $proto, $range ) = @_;
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if ( $range =~ /^(.*):(.*)$/ ) {
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my ( $first, $last ) = ( $1, $2);
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my @result;
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fatal_error "Invalid port range ($range)" unless $first ne '' or $last ne '';
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#
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# Supply missing first/last port number
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#
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$first = 0 if $first eq '';
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$last = 65535 if $last eq '';
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#
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# Validate the ports
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#
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( $first , $last ) = ( validate_port( $proto, $first || 1 ) , validate_port( $proto, $last ) );
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$last++; #Increment last address for limit testing.
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#
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# Break the range into groups:
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#
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# - If the first port in the remaining range is odd, then the next group is ( <first>, ffff ).
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# - Otherwise, find the largest power of two P that divides the first address such that
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# the remaining range has less than or equal to P ports. The next group is
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# ( <first> , ~( P-1 ) ).
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#
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while ( ( my $ports = ( $last - $first ) ) > 0 ) {
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my $mask = 0xffff; #Mask for current ports in group.
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my $y = 2; #Next power of two to test
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my $z = 1; #Number of ports in current group (Previous value of $y).
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while ( ( ! ( $first % $y ) ) && ( $y <= $ports ) ) {
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$mask <<= 1;
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$z = $y;
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$y <<= 1;
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}
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#
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#
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push @result, sprintf( '%04x', $first ) , sprintf( '%04x' , $mask & 0xffff );
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$first += $z;
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}
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fatal_error "Invalid port range ($range)" unless @result; # first port > last port
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@result;
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} else {
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( sprintf( '%04x' , validate_port( $proto, $range ) ) , 'ffff' );
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}
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}
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#
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# Functions to manipulate cmdlevel
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#
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@ -5758,6 +5951,7 @@ sub record_runtime_address( $$;$$ ) {
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if ( $interface =~ /^{([a-zA-Z_]\w*)}$/ ) {
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fatal_error "Mixed required/optional usage of address variable $1" if ( $address_variables{$1} || $addrtype ) ne $addrtype;
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fatal_error "Variable %variable is already used as a port variable" if $port_variables{$1};
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$address_variables{$1} = $addrtype;
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return '$' . "$1 ";
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}
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@ -7045,6 +7239,19 @@ sub verify_address_variables() {
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qq( startup_error "Invalid value ($address) for address variable $variable"),
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qq(fi\n) );
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}
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for my $variable( keys %port_variables ) {
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my $port = "\$$variable";
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my $type = $port_variables{$variable};
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emit( qq(if [ -z "$port" ]; then) ,
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qq( $variable=255) ,
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qq(elif qt \$g_tool -A INPUT -p 6 --dport $port; then) ,
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qq( qt \$g_tool -D INPUT -p 6 --dport $variable) ,
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qq(else) ,
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qq( startup_error "Invalid valid ($port) for port variable $variable") ,
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qq(fi\n) );
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}
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}
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#
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@ -63,7 +63,6 @@ our @EXPORT = ( qw( ALLIPv4
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validate_host
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validate_range
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ip_range_explicit
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expand_port_range
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allipv4
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allipv6
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allip
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@ -74,10 +73,6 @@ our @EXPORT = ( qw( ALLIPv4
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resolve_proto
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resolve_dnsname
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proto_name
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validate_port
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validate_portpair
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validate_portpair1
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validate_port_list
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validate_icmp
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validate_icmp6
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) );
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@ -411,114 +406,6 @@ sub proto_name( $ ) {
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$proto =~ /^(\d+)$/ ? $prototoname[ $proto ] || scalar getprotobynumber $proto : $proto
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}
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sub validate_port( $$ ) {
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my ($proto, $port) = @_;
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my $value;
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if ( $port =~ /^(\d+)$/ || $port =~ /^0x/ ) {
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$port = numeric_value $port;
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return $port if defined $port && $port && $port <= 65535;
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} else {
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$proto = proto_name $proto if $proto =~ /^(\d+)$/;
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$value = getservbyname( $port, $proto );
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}
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return $value if defined $value;
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fatal_error "The separator for a port range is ':', not '-' ($port)" if $port =~ /^\d+-\d+$/;
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fatal_error "Invalid/Unknown $proto port/service ($_[1])" unless defined $value;
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}
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sub validate_portpair( $$ ) {
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my ($proto, $portpair) = @_;
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my $what;
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my $pair = $portpair;
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#
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# Accept '-' as a port-range separator
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#
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$pair =~ tr/-/:/ if $pair =~ /^[-0-9]+$/;
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fatal_error "Invalid port range ($portpair)" if $pair =~ tr/:/:/ > 1;
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$pair = "0$pair" if substr( $pair, 0, 1 ) eq ':';
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$pair = "${pair}65535" if substr( $pair, -1, 1 ) eq ':';
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my @ports = split /:/, $pair, 2;
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my $protonum = resolve_proto( $proto ) || 0;
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$_ = validate_port( $protonum, $_) for grep $_, @ports;
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if ( @ports == 2 ) {
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$what = 'port range';
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fatal_error "Invalid port range ($portpair)" unless $ports[0] < $ports[1];
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} else {
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$what = 'port';
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}
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fatal_error "Using a $what ( $portpair ) requires PROTO TCP, UDP, UDPLITE, SCTP or DCCP" unless
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defined $protonum && ( $protonum == TCP ||
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$protonum == UDP ||
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$protonum == UDPLITE ||
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$protonum == SCTP ||
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$protonum == DCCP );
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join ':', @ports;
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}
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sub validate_portpair1( $$ ) {
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my ($proto, $portpair) = @_;
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my $what;
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fatal_error "Invalid port range ($portpair)" if $portpair =~ tr/-/-/ > 1;
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$portpair = "1$portpair" if substr( $portpair, 0, 1 ) eq ':';
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$portpair = "${portpair}65535" if substr( $portpair, -1, 1 ) eq ':';
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my @ports = split /-/, $portpair, 2;
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my $protonum = resolve_proto( $proto ) || 0;
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$_ = validate_port( $protonum, $_) for grep $_, @ports;
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if ( @ports == 2 ) {
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$what = 'port range';
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fatal_error "Invalid port range ($portpair)" unless $ports[0] && $ports[0] < $ports[1];
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} else {
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$what = 'port';
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fatal_error 'Invalid port number (0)' unless $portpair;
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}
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fatal_error "Using a $what ( $portpair ) requires PROTO TCP, UDP, SCTP or DCCP" unless
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defined $protonum && ( $protonum == TCP ||
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$protonum == UDP ||
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$protonum == SCTP ||
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$protonum == DCCP );
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join '-', @ports;
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}
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sub validate_port_list( $$ ) {
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my $result = '';
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my ( $proto, $list ) = @_;
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my @list = split_list( $list, 'port' );
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if ( @list > 1 && $list =~ /[:-]/ ) {
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require_capability( 'XMULTIPORT' , 'Port ranges in a port list', '' );
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}
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$proto = proto_name $proto;
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for ( @list ) {
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my $value = validate_portpair( $proto , $_ );
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$result = $result ? join ',', $result, $value : $value;
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}
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$result;
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}
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my %icmp_types = ( any => 'any',
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'echo-reply' => 0,
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'destination-unreachable' => 3,
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@ -572,67 +459,6 @@ sub validate_icmp( $ ) {
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fatal_error "Invalid ICMP Type ($type)"
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}
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#
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# Expands a port range into a minimal list of ( port, mask ) pairs.
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# Each port and mask are expressed as 4 hex nibbles without a leading '0x'.
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#
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# Example:
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#
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# DB<3> @foo = Shorewall::IPAddrs::expand_port_range( 6, '110:' ); print "@foo\n"
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# 006e fffe 0070 fff0 0080 ff80 0100 ff00 0200 fe00 0400 fc00 0800 f800 1000 f000 2000 e000 4000 c000 8000 8000
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#
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sub expand_port_range( $$ ) {
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my ( $proto, $range ) = @_;
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if ( $range =~ /^(.*):(.*)$/ ) {
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my ( $first, $last ) = ( $1, $2);
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my @result;
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fatal_error "Invalid port range ($range)" unless $first ne '' or $last ne '';
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#
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# Supply missing first/last port number
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#
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$first = 0 if $first eq '';
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$last = 65535 if $last eq '';
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#
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# Validate the ports
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#
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( $first , $last ) = ( validate_port( $proto, $first || 1 ) , validate_port( $proto, $last ) );
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$last++; #Increment last address for limit testing.
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#
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# Break the range into groups:
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#
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# - If the first port in the remaining range is odd, then the next group is ( <first>, ffff ).
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# - Otherwise, find the largest power of two P that divides the first address such that
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# the remaining range has less than or equal to P ports. The next group is
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# ( <first> , ~( P-1 ) ).
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#
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while ( ( my $ports = ( $last - $first ) ) > 0 ) {
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my $mask = 0xffff; #Mask for current ports in group.
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my $y = 2; #Next power of two to test
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my $z = 1; #Number of ports in current group (Previous value of $y).
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while ( ( ! ( $first % $y ) ) && ( $y <= $ports ) ) {
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$mask <<= 1;
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$z = $y;
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$y <<= 1;
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}
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#
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#
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push @result, sprintf( '%04x', $first ) , sprintf( '%04x' , $mask & 0xffff );
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$first += $z;
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}
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fatal_error "Invalid port range ($range)" unless @result; # first port > last port
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@result;
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} else {
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( sprintf( '%04x' , validate_port( $proto, $range ) ) , 'ffff' );
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}
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}
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sub valid_6address( $ ) {
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my $address = $_[0];
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