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/* Copyright (C) 2000-2006 Boris Wesslowski */
/* $Id: cisco_pix.l,v 1.18 2006/03/08 20:27:59 bw Exp $ */
%option prefix="cisco_pix"
%option outfile="cisco_pix.c"
%option noyywrap
%{
#define YY_NO_UNPUT
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "main.h"
#include "utils.h"
extern struct options opt;
void cisco_pix_parse_date(char *input, unsigned char mode);
void cisco_pix_parse_src(char *input, unsigned char mode);
void cisco_pix_parse_dst(char *input, unsigned char mode);
void cisco_pix_parse_group(char *input);
%}
MONTH "Jan"|"Feb"|"Mar"|"Apr"|"May"|"Jun"|"Jul"|"Aug"|"Sep"|"Oct"|"Nov"|"Dec"
STRING [a-zA-Z][a-zA-Z0-9._-]*
LOGHOST [0-9.a-zA-Z()_:-]*
DIGIT [0-9]
NUMBER {DIGIT}+
OCTET {DIGIT}{1,3}
PORT {DIGIT}{1,5}
IP {OCTET}"."{OCTET}"."{OCTET}"."{OCTET}
IPPORT {IP}"/"{PORT}
ZONEIP {STRING}":"{IP}
ZONEIPPORT {STRING}":"{IP}"/"{PORT}
SYSID ("%PIX"|"%FWSM")"-"[1-7]"-"[0-9]{6}":"
%%
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}[ ]{LOGHOST} cisco_pix_parse_date(cisco_pixtext, CP_OPT_HOST);
{SYSID} /* ignore */
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{4}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}(":")? cisco_pix_parse_date(cisco_pixtext, CP_OPT_NONE);
{LOGHOST}[ ]+": " /* ignore */
" Inbound TCP connection denied from "{IPPORT} cisco_pix_parse_src(cisco_pixtext+36, CP_OPT_TCP);
" Deny TCP (no connection) from "{IPPORT} cisco_pix_parse_src(cisco_pixtext+31, CP_OPT_TCP);
" Deny inbound UDP from "{IPPORT} cisco_pix_parse_src(cisco_pixtext+23, CP_OPT_UDP);
" Deny udp src "{ZONEIPPORT} cisco_pix_parse_src(cisco_pixtext+14, CP_OPT_UDP_S);
" Deny tcp src "{ZONEIPPORT} cisco_pix_parse_src(cisco_pixtext+14, CP_OPT_TCP_S);
" Deny icmp src "{ZONEIP} cisco_pix_parse_src(cisco_pixtext+15, CP_OPT_ICMP_S);
" Deny inbound icmp src "{ZONEIP} cisco_pix_parse_src(cisco_pixtext+23, CP_OPT_ICMP_S);
" Deny inbound tcp src "{ZONEIPPORT} cisco_pix_parse_src(cisco_pixtext+22, CP_OPT_TCP_S);
" Deny inbound (No xlate) tcp src "{ZONEIPPORT} cisco_pix_parse_src(cisco_pixtext+33, CP_OPT_TCP_S);
" Deny inbound (No xlate) udp src "{ZONEIPPORT} cisco_pix_parse_src(cisco_pixtext+33, CP_OPT_UDP_S);
" Deny inbound (No xlate) icmp src "{ZONEIP} cisco_pix_parse_src(cisco_pixtext+34, CP_OPT_ICMP_S);
{IP}" attempted to ping " cisco_pix_parse_src(cisco_pixtext, CP_OPT_ICMP);
"to "{IPPORT} cisco_pix_parse_dst(cisco_pixtext+3, CP_OPT_DST);
"dst "{ZONEIPPORT} cisco_pix_parse_dst(cisco_pixtext+4, CP_OPT_DST_S);
"dst "{ZONEIP}" (type "{PORT}", code "{PORT}")" cisco_pix_parse_dst(cisco_pixtext+4, CP_OPT_DST_I);
{IP} cisco_pix_parse_dst(cisco_pixtext, CP_OPT_NONE);
"flags" /* ignore */
"URG" opt.line->flags = opt.line->flags | TCP_URG;
"ACK" opt.line->flags = opt.line->flags | TCP_ACK;
"PSH" opt.line->flags = opt.line->flags | TCP_PSH;
"RST" opt.line->flags = opt.line->flags | TCP_RST;
"SYN" opt.line->flags = opt.line->flags | TCP_SYN;
"FIN" opt.line->flags = opt.line->flags | TCP_FIN;
"on interface "{STRING} xstrncpy(opt.line->interface, cisco_pixtext+13, SHORTLEN);
"by access-group \""{STRING}"\"" cisco_pix_parse_group(cisco_pixtext+17);
"due to DNS "("Query"|"Response") /* ignore */
"("{IP}")" /* ignore */
" Built dynamic "("TCP"|"UDP"|"ICMP")" translation from "{ZONEIPPORT}" to "{ZONEIPPORT} opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Built "("inbound"|"outbound")" "("TCP"|"UDP")" connection "{NUMBER}" for "{ZONEIPPORT}" ("{IPPORT}") to "{ZONEIPPORT}" ("{IPPORT}")" opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Built static translation from "{ZONEIP}" to "{ZONEIP} opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Built local-host "{ZONEIP} opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Teardown dynamic "("TCP"|"UDP"|"ICMP")" translation from "{ZONEIPPORT}" to "{ZONEIPPORT}" duration "[0-9:]+ opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Teardown "("TCP"|"UDP")" connection "{NUMBER}" for "{ZONEIPPORT}" to "{ZONEIPPORT}" duration "[0-9:]+" bytes "{NUMBER}(" TCP "("Reset-"("I"|"O")|"FINs")|" "("SYN"|"FIN")" Timeout")? opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" Teardown local-host "{ZONEIP}" duration "[0-9:]+ opt.parser=opt.parser|CISCO_PIX_NO_HIT;
{IP}" Accessed URL ".+ opt.parser=opt.parser|CISCO_PIX_NO_HIT;
" IGRP request discarded from "{IP}" to "{ZONEIP} opt.parser=opt.parser|CISCO_PIX_NO_HIT;
{NUMBER}" in use, "{NUMBER}" most used" opt.parser=opt.parser|CISCO_PIX_NO_HIT;
[ ]+ /* ignore whitespace */
[\n] /* ignore */
{STRING} if(opt.verbose) fprintf(stderr, "Unrecognized token: %s\n", cisco_pixtext);
. if(opt.verbose) fprintf(stderr, "Unrecognized character: %s\n", cisco_pixtext);
%%
void cisco_pix_parse_date(char *input, unsigned char mode)
{
int retval, day, hour, minute, second;
char smonth[3];
#ifdef IRIX
char tmp[SHOSTLEN];
#endif
#ifdef LOGDOTS
char *remove_dot;
#endif
if (mode == CP_OPT_HOST) {
retval = sscanf(input, "%3s %2d %2d:%2d:%2d %32s",
smonth, &day, &hour, &minute, &second,
#ifndef IRIX
opt.line->hostname);
#else
tmp);
if(retval != 6) return;
if(tmp[2] == ':')
xstrncpy(opt.line->hostname, tmp+3, SHOSTLEN);
#endif
#ifdef LOGDOTS
remove_dot = strstr(opt.line->hostname, ".");
if(remove_dot != NULL)
*remove_dot = '\0';
#endif
} else if (mode == CP_OPT_NONE) {
int year;
retval = sscanf(input, "%3s %2d %4d %2d:%2d:%2d",
smonth, &day, &year, &hour, &minute, &second);
if(retval != 6) return;
}
build_time(smonth, day, hour, minute, second);
opt.parser=opt.parser|CISCO_PIX_DATE;
}
void cisco_pix_parse_src(char *input, unsigned char mode)
{
char ip[IPLEN];
int shost1, shost2, shost3, shost4;
int retval;
if ((mode == CP_OPT_TCP) || (mode == CP_OPT_UDP)) {
retval = sscanf(input, "%3d.%3d.%3d.%3d/%5d",
&shost1, &shost2, &shost3, &shost4, &opt.line->sport);
if (mode == CP_OPT_TCP)
opt.line->protocol = 6;
else
opt.line->protocol = 17;
if(retval != 5) return;
} else if ((mode == CP_OPT_TCP_S) || (mode == CP_OPT_UDP_S)) {
char buf[BUFSIZE], *pnt;
pnt = strstr(input, ":");
*pnt = ' ';
retval = sscanf(input, "%" BUFSIZE_S "s %3d.%3d.%3d.%3d/%5d",
buf, &shost1, &shost2, &shost3, &shost4, &opt.line->sport);
if (mode == CP_OPT_TCP_S)
opt.line->protocol = 6;
else
opt.line->protocol = 17;
if(retval != 6) return;
} else if (mode == CP_OPT_ICMP_S) {
char buf[BUFSIZE], *pnt;
pnt = strstr(input, ":");
*pnt = ' ';
retval = sscanf(input, "%" BUFSIZE_S "s %3d.%3d.%3d.%3d",
buf, &shost1, &shost2, &shost3, &shost4);
opt.line->protocol = 1;
if(retval != 5) return;
} else if (mode == CP_OPT_ICMP) {
retval = sscanf(input, "%3d.%3d.%3d.%3d attempted to ping",
&shost1, &shost2, &shost3, &shost4);
opt.line->protocol = 1;
if(retval != 4) return;
}
snprintf(ip, IPLEN, "%d.%d.%d.%d", shost1, shost2, shost3, shost4);
if(convert_ip(ip, &opt.line->shost) == IN_ADDR_ERROR) return;
opt.parser=opt.parser|CISCO_PIX_SRC;
}
void cisco_pix_parse_dst(char *input, unsigned char mode)
{
char ip[IPLEN];
int dhost1, dhost2, dhost3, dhost4;
int retval;
if (mode == CP_OPT_DST) {
retval = sscanf(input, "%3d.%3d.%3d.%3d/%5d",
&dhost1, &dhost2, &dhost3, &dhost4, &opt.line->dport);
if(retval != 5) return;
} else if (mode == CP_OPT_DST_S) {
char buf[BUFSIZE], *pnt;
pnt = strstr(input, ":");
*pnt = ' ';
retval = sscanf(input, "%" BUFSIZE_S "s %3d.%3d.%3d.%3d/%5d",
buf, &dhost1, &dhost2, &dhost3, &dhost4, &opt.line->dport);
if(retval != 6) return;
} else if (mode == CP_OPT_DST_I) {
char buf[BUFSIZE], *pnt;
pnt = strstr(input, ":");
*pnt = ' ';
retval = sscanf(input, "%" BUFSIZE_S "s %3d.%3d.%3d.%3d (type %5d, code %5d)",
buf, &dhost1, &dhost2, &dhost3, &dhost4, &opt.line->sport, &opt.line->dport);
if(retval != 7) return;
} else if (mode == CP_OPT_NONE) {
retval = sscanf(input, "%3d.%3d.%3d.%3d",
&dhost1, &dhost2, &dhost3, &dhost4);
if(retval != 4) return;
}
snprintf(ip, IPLEN, "%d.%d.%d.%d", dhost1, dhost2, dhost3, dhost4);
if(convert_ip(ip, &opt.line->dhost) == IN_ADDR_ERROR) return;
opt.parser=opt.parser|CISCO_PIX_DST;
}
void cisco_pix_parse_group(char *input)
{
char *pnt;
pnt = strstr(input, "\"");
*pnt = '\0';
xstrncpy(opt.line->chainlabel, input, SHORTLEN);
}
unsigned char flex_cisco_pix(char *input, int linenum)
{
opt.parser = 0;
init_line();
xstrncpy(opt.line->interface, "-", SHORTLEN);
xstrncpy(opt.line->chainlabel, "-", SHORTLEN);
xstrncpy(opt.line->branchname, "Deny", SHORTLEN);
opt.line->count = 1;
cisco_pix_scan_string(input);
cisco_pixlex();
cisco_pix_delete_buffer(YY_CURRENT_BUFFER);
if (opt.parser & CISCO_PIX_NO_HIT)
return PARSE_NO_HIT;
if (opt.parser == (CISCO_PIX_DATE|CISCO_PIX_SRC|CISCO_PIX_DST)) {
return PARSE_OK;
} else {
if(opt.verbose)
fprintf(stderr, "cisco_pix parse error in line %d, ignoring.\n", linenum);
if(opt.verbose == 2)
fprintf(stderr, "input was: \"%s\"\n", input);
return PARSE_WRONG_FORMAT;
}
}
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