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pf.g
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/*
Firewall Builder
Copyright (C) 2011 NetCitadel, LLC
Author: Vadim Kurland [email protected]
This program is free software which we release under the GNU General Public
License. You may redistribute and/or modify this program under the terms
of that license as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
To get a copy of the GNU General Public License, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
header "pre_include_hpp"
{
// gets inserted before antlr generated includes in the header
// file
#include "PFImporter.h"
}
header "post_include_hpp"
{
// gets inserted after antlr generated includes in the header file
// outside any generated namespace specifications
#include <iostream>
#include <sstream>
class PFImporter;
}
header "pre_include_cpp"
{
// gets inserted before the antlr generated includes in the cpp
// file
}
header "post_include_cpp"
{
// gets inserted after the antlr generated includes in the cpp
// file
#include <antlr/Token.hpp>
#include <antlr/TokenBuffer.hpp>
}
header
{
// gets inserted after generated namespace specifications in the
// header file. But outside the generated class.
}
options
{
language="Cpp";
}
class PFCfgParser extends Parser;
options
{
k = 2;
// when default error handler is disabled, parser errors cause
// exception and terminate parsing process. We can catch the exception
// and make the error appear in importer log, but import process
// terminates which is not always optimal
//
// defaultErrorHandler = false;
// see http://www.antlr2.org/doc/options.html
}
{
// additional methods and members
public:
std::ostream *dbg;
PFImporter *importer;
/// Parser error-reporting function can be overridden in subclass
virtual void reportError(const ANTLR_USE_NAMESPACE(antlr)RecognitionException& ex)
{
importer->addMessageToLog("Parser error: " + ex.toString());
importer->error_tracker->registerError("Parser error: " + ex.toString());
std::cerr << ex.toString() << std::endl;
}
/// Parser error-reporting function can be overridden in subclass
virtual void reportError(const ANTLR_USE_NAMESPACE(std)string& s)
{
importer->addMessageToLog("Parser error: " + s);
importer->error_tracker->registerError("Parser error: " + s);
std::cerr << s << std::endl;
}
/// Parser warning-reporting function can be overridden in subclass
virtual void reportWarning(const ANTLR_USE_NAMESPACE(std)string& s)
{
importer->addMessageToLog("Parser warning: " + s);
importer->error_tracker->registerError("Parser warning: " + s);
std::cerr << s << std::endl;
}
}
cfgfile :
(
comment
|
include_command
|
macro_definition
|
altq_rule
|
antispoof_rule
|
queue_rule
|
set_rule
|
scrub_rule
|
match_rule
|
table_rule
|
no_nat_rule
|
nat_rule
|
rdr_rule
|
binat_rule
|
pass_rule
|
block_rule
|
// unknown_rule
// |
NEWLINE
)*
;
//****************************************************************
comment :
COMMENT_START
{
QStringList str;
while (LA(1) != ANTLR_USE_NAMESPACE(antlr)Token::EOF_TYPE &&
LA(1) != NEWLINE)
{
str << QString::fromUtf8(LT(1)->getText().c_str());
consume();
}
importer->last_comment << str.join(" ");
}
;
//****************************************************************
include_command : INCLUDE_COMMAND
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'include' commands is not supported."));
consumeUntil(NEWLINE);
}
;
//****************************************************************
macro_definition : WORD EQUAL
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
consumeUntil(NEWLINE);
}
;
//****************************************************************
antispoof_rule : ANTISPOOF
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Warning: import of 'antispoof' commands has not been implemented yet."));
consumeUntil(NEWLINE);
}
;
//****************************************************************
altq_rule : ALTQ
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->error_tracker->registerError(
QString("import of 'altq' commands is not supported."));
consumeUntil(NEWLINE);
}
;
//****************************************************************
queue_rule : QUEUE
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->error_tracker->registerError(
QString("import of 'queue' commands is not supported."));
consumeUntil(NEWLINE);
}
;
//****************************************************************
set_rule : SET
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
}
(
set_timeout
|
set_ruleset_optimization
|
set_optimization
|
set_limit
|
set_loginterface
|
set_block_policy
|
set_state_policy
|
set_state_defaults
|
set_require_order
|
set_fingerprints
|
set_skip
|
set_debug
|
set_reassemble
|
set_hostid
)
;
set_timeout
:
TIMEOUT ( timeout_def | timeout_def_list )
;
set_ruleset_optimization
:
"ruleset-optimization"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set ruleset-optimization' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_optimization
:
"optimization"
(
"aggressive"
|
"conservative"
|
"high-latency"
|
"normal"
|
"satellite"
) { importer->set_optimization = LT(0)->getText(); }
;
set_limit
:
"limit" ( limit_def | limit_def_list )
;
set_loginterface
:
"loginterface"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set loginterface' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_block_policy
:
"block-policy"
(DROP | RETURN) { importer->set_block_policy = LT(0)->getText(); }
;
set_state_policy
:
"state-policy"
("if-bound" | "floating") { importer->set_state_policy = LT(0)->getText(); }
;
set_state_defaults
:
"state-defaults"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set state-defaults' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_require_order
:
"require-order"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set require-order' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_fingerprints
:
"fingerprints"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set fingerprints' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_skip
:
"skip" ON skip_def
;
skip_def
:
WORD { importer->set_skip_on.push_back(LT(0)->getText()); }
|
skip_list
;
skip_list
:
OPENING_BRACE
WORD { importer->set_skip_on.push_back(LT(0)->getText()); }
(
( COMMA )*
WORD { importer->set_skip_on.push_back(LT(0)->getText()); }
)*
CLOSING_BRACE
;
set_debug
:
"debug" WORD
{
importer->set_debug = LT(0)->getText();
}
;
set_reassemble
:
"reassemble"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set reassemble' commands is not supported."));
consumeUntil(NEWLINE);
}
;
set_hostid
:
"hostid"
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->addMessageToLog(
QString("Error: import of 'set hostid' commands is not supported."));
consumeUntil(NEWLINE);
}
;
/*
timeout = ( "tcp.first" | "tcp.opening" | "tcp.established" |
"tcp.closing" | "tcp.finwait" | "tcp.closed" |
"udp.first" | "udp.single" | "udp.multiple" |
"icmp.first" | "icmp.error" |
"other.first" | "other.single" | "other.multiple" |
"frag" | "interval" | "src.track" |
"adaptive.start" | "adaptive.end" ) number
*/
timeout_def { std::string timeout_name, timeout_value; }
:
(
"tcp.first"
|
"tcp.opening"
|
"tcp.established"
|
"tcp.closing"
|
"tcp.finwait"
|
"tcp.closed"
|
"udp.first"
|
"udp.single"
|
"udp.multiple"
|
"icmp.first"
|
"icmp.error"
|
"other.first"
|
"other.single"
|
"other.multiple"
|
"frag"
|
"interval"
|
"src.track"
|
"adaptive.start"
|
"adaptive.end"
)
{
timeout_name = LT(0)->getText();
}
INT_CONST
{
timeout_value = LT(0)->getText();
importer->timeouts.push_back(
std::pair<std::string, std::string>(timeout_name, timeout_value));
}
;
timeout_def_list
:
OPENING_BRACE
timeout_def
(
( COMMA )?
timeout_def
)*
CLOSING_BRACE
;
limit_def { std::string limit_name, limit_value; }
:
(
"frags"
|
"states"
|
"src-nodes"
|
"tables"
|
"tables-entries"
)
{
limit_name = LT(0)->getText();
}
INT_CONST
{
limit_value = LT(0)->getText();
importer->limits.push_back(
std::pair<std::string, std::string>(limit_name, limit_value));
}
;
limit_def_list
:
OPENING_BRACE
limit_def
(
( COMMA )?
limit_def
)*
CLOSING_BRACE
;
//****************************************************************
scrub_rule : SCRUB
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newPolicyRule();
importer->action = "scrub";
*dbg << LT(1)->getLine() << ":" << " scrub ";
}
rule_extended
// do not call pushRule() for scrub rules because we configure
// scrub parameters as firewall options
NEWLINE
;
//****************************************************************
match_rule : MATCH
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newPolicyRule();
importer->action = "match";
*dbg << LT(1)->getLine() << ":" << " match ";
}
rule_extended
{
if ( ! importer->scrub_rule) importer->pushRule();
}
NEWLINE
;
//****************************************************************
table_rule :
TABLE
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
}
LESS_THAN
name:WORD
GREATER_THAN
(
PERSIST
) ?
(
CONST_WORD
{
importer->addMessageToLog(
QString("Warning: attribute \"const\" will be dropped from table configuration since this attribute is not supported at this time"));
}
) ?
(
COUNTERS
{
importer->addMessageToLog(
QString("Warning: attribute \"counters\" will be dropped from table configuration since this attribute is not supported at this time"));
}
)?
(
FILE file:STRING
{
importer->newAddressTableObject(
name->getText(), file->getText());
}
|
OPENING_BRACE
tableaddr_spec
(
( COMMA )?
tableaddr_spec
)*
CLOSING_BRACE
{
importer->newAddressTableObject(
name->getText(), importer->tmp_group);
}
|
NEWLINE
{
// Special case: table definition without file name or list of addresses.
// Create run-time AddressTable object with name but no file spec.
importer->newAddressTableObject(name->getText(), "");
}
)
;
tableaddr_spec { AddressSpec as; } :
( EXLAMATION { as.neg = true; } )?
(
WORD
{
// interface name or domain/host name
as.at = AddressSpec::INTERFACE_OR_HOST_NAME;
as.address = LT(0)->getText();
}
(
COLON
(
NETWORK
{
as.at = AddressSpec::INTERFACE_NETWORK;
}
|
BROADCAST
{
as.at = AddressSpec::INTERFACE_BROADCAST;
}
|
PEER
{
importer->error_tracker->registerError(
QString("import of 'interface:peer' is not supported."));
}
|
INT_CONST
{
importer->error_tracker->registerError(
QString("import of 'interface:0' is not supported."));
}
)
)?
|
SELF
{
as.at = AddressSpec::SPECIAL_ADDRESS;
as.address = "self";
}
|
// match NUMBER and INT_CONST to account for 10/8, 172.16/12 cases.
( IPV4 | NUMBER | INT_CONST )
{
as.at = AddressSpec::HOST_ADDRESS;
as.address = LT(0)->getText();
}
(
SLASH
{
as.at = AddressSpec::NETWORK_ADDRESS;
}
( IPV4 | INT_CONST )
{
as.netmask = LT(0)->getText();
}
)?
)
{
importer->tmp_group.push_back(as);
}
;
//****************************************************************
no_nat_rule :
NO
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newNATRule();
importer->action = "nonat";
*dbg << LT(1)->getLine() << ":" << " nonat ";
}
(
nat_rule
|
rdr_rule
)
;
//****************************************************************
nat_rule :
NAT
{
if ( importer->action != "nonat" )
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newNATRule();
importer->action = "nat";
*dbg << LT(1)->getLine() << ":" << " nat ";
}
}
(
PASS
{
importer->error_tracker->registerError(
QString("import of 'nat pass' commands is not supported."));
}
( logging )?
)?
( intrface )?
( address_family )?
( protospec )?
hosts
( tagged )?
(
tag_clause
{
importer->error_tracker->registerError(
QString("import of 'nat ... tag' commands is not supported."));
}
)?
(
MINUS GREATER_THAN
( redirhost | redirhost_list )
{
importer->nat_group = importer->tmp_group;
}
(
portspec
{
importer->nat_port_group = importer->tmp_port_group;
}
)?
( pooltype )?
(
STATIC_PORT { importer->nat_rule_opt_2 = "static-port"; }
)?
)?
{
importer->pushRule();
}
NEWLINE
;
//****************************************************************
rdr_rule :
RDR
{
if ( importer->action != "nonat" )
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newNATRule();
importer->action = "rdr";
*dbg << LT(1)->getLine() << ":" << " rdr ";
}
}
(
PASS
{
importer->error_tracker->registerError(
QString("import of 'nat pass' commands is not supported."));
}
( logging )?
)?
( intrface )?
( address_family )?
( protospec )?
hosts
( tagged )?
(
tag_clause
{
importer->error_tracker->registerError(
QString("import of 'nat ... tag' commands is not supported."));
}
)?
(
MINUS GREATER_THAN
( redirhost | redirhost_list )
{
importer->nat_group = importer->tmp_group;
}
(
portspec
{
importer->nat_port_group = importer->tmp_port_group;
}
)?
( pooltype )?
)?
{
importer->pushRule();
}
NEWLINE
;
// redirhost = address [ "/" mask-bits ]
// address = ( interface-name | interface-group |
// "(" ( interface-name | interface-group ) ")" |
// hostname | ipv4-dotted-quad | ipv6-coloned-hex )
//
redirhost { AddressSpec as; } :
(
IPV4
{
as.at = AddressSpec::HOST_ADDRESS;
as.address = LT(0)->getText();
}
(
SLASH
{
as.at = AddressSpec::NETWORK_ADDRESS;
}
( IPV4 | INT_CONST )
{
as.netmask = LT(0)->getText();
}
)?
|
OPENING_PAREN
WORD
{
// interface name or domain/host name
as.at = AddressSpec::INTERFACE_OR_HOST_NAME;
as.address = LT(0)->getText();
}
CLOSING_PAREN
|
WORD
{
// interface name or domain/host name
as.at = AddressSpec::INTERFACE_OR_HOST_NAME;
as.address = LT(0)->getText();
}
)
{
importer->tmp_group.push_back(as);
}
;
redirhost_list :
OPENING_BRACE
redirhost
(
( COMMA )?
redirhost
)*
CLOSING_BRACE
;
// portspec = "port" ( number | name ) [ ":" ( "*" | number | name ) ]
//
//
// rdr The packet is redirected to another destination and possibly a dif-
// ferent port. rdr rules can optionally specify port ranges instead
// of single ports. rdr ... port 2000:2999 -> ... port 4000 redirects
// ports 2000 to 2999 (inclusive) to port 4000. rdr ... port
// 2000:2999 -> ... port 4000:* redirects port 2000 to 4000, 2001 to
// 4001, ..., 2999 to 4999.
//
portspec { PortSpec ps; } :
PORT
(
port_def
{
ps.port1 = importer->tmp_port_def;
ps.port2 = ps.port1;
ps.port_op = "=";
}
|
// lexer matches port range (1000:1010) as IPv6, see rule
// NUMBER_ADDRESS_OR_WORD. Combination "1000:*" comes as IPV6 STAR
IPV6
{
ps.setFromPortRange(LT(0)->getText());
}
(
STAR { ps.port2 = "65535"; }
)?
)
{
importer->tmp_port_group.push_back(ps);
}
;
// pooltype = ( "bitmask" | "random" |
// "source-hash" [ ( hex-key | string-key ) ] |
// "round-robin" ) [ sticky-address ]
//
// Note that as of v4.2 we can not generate optinal parameters for the
// "source-hash" pooltype. "sticky-address" is not supported either.
//
pooltype :
(
BITMASK { importer->pooltype_opt = "bitmask"; }
|
RANDOM { importer->pooltype_opt = "random"; }
|
SOURCE_HASH { importer->pooltype_opt = "source-hash"; }
(
HEX_KEY
{
importer->error_tracker->registerError(
QString("import of commands with pool type 'source-hash hex-key' "
"option is not supported"));
}
|
STRING_KEY
{
importer->error_tracker->registerError(
QString("import of commands with pool type 'source-hash string-key' "
"option is not supported"));
}
)?
|
ROUND_ROBIN { importer->pooltype_opt = "round-robin"; }
)
( STICKY_ADDRESS )?
;
//****************************************************************
binat_rule : BINAT
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->error_tracker->registerError(
QString("import of 'binat' commands is not supported."));
consumeUntil(NEWLINE);
}
;
//****************************************************************
//unknown_rule : WORD
// {
// importer->clear();
// importer->setCurrentLineNumber(LT(0)->getLine());
// consumeUntil(NEWLINE);
// }
// ;
//****************************************************************
pass_rule : PASS
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newPolicyRule();
importer->action = "pass";
*dbg << LT(1)->getLine() << ":" << " pass ";
}
rule_extended
{
importer->pushRule();
}
NEWLINE
;
block_rule : BLOCK
{
importer->clear();
importer->setCurrentLineNumber(LT(0)->getLine());
importer->newPolicyRule();
importer->action = "block";
*dbg << LT(1)->getLine() << ":" << " block ";
}
( block_return )?
rule_extended
{
importer->pushRule();
}
NEWLINE
;
block_return :
(
DROP { importer->block_action_params.push_back("drop"); }
|
RETURN { importer->block_action_params.push_back("return"); }
|
RETURN_RST { importer->block_action_params.push_back("return-rst"); }
(
TTL INT_CONST
{
importer->error_tracker->registerError(
QString("Import of \"block return-rst ttl number\" is not supported. "));
}
)?
|
RETURN_ICMP { importer->block_action_params.push_back("return-icmp"); }
(
OPENING_PAREN
( icmp_code_by_name | INT_CONST )
{ importer->block_action_params.push_back(LT(0)->getText()); }
(
COMMA
( icmp_code_by_name | INT_CONST )