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spo_alert_fwsam.c
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spo_alert_fwsam.c
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/*
** spo_alert_fwsam.c
**
** Copyright (c) 2001-2005 Frank Knobbe <frank@knobbe.us>
** Portions Copyright (c) 2012 Ian Firns <firnsy@securixlive.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public 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.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* Purpose:
*
* This module sends alerts to a remote service on a host running SnortSam
* (the agent) which will block the intruding IP address on a variety of
* host and network firewalls.
*
* SnortSam also performs checks against a white-list of never-to-be-blocked IP addresses,
* can override block durations (for example for known proxies), and can detect attack conditions
* where too many blocks are received within a defined interval. If an attack is detected
* it will unblock the last x blocks and wait for the attack to end.
*
* See the SnortSam documentation for more information.
*
*
* Output Plugin Parameters:
***************************
*
* output alert_fwsam: <SnortSam Station>:<port>/<key>
*
* <FW Mgmt Station>: IP address or host name of the host running SnortSam.
* <port>: Port the remote SnortSam service listens on (default 898).
* <key>: Key used for authentication (encryption really)
* of the communication to the remote service.
*
* Examples:
*
* output alert_fwsam: snortsambox/idspassword
* output alert_fwsam: fw1.domain.tld:898/mykey
* output alert_fwsam: 192.168.0.1/borderfw 192.168.1.254/wanfw
*
*
* sid-fwsam Parameters:
***********************
*
* <sid>: who[how],time;
*
* who: src, source, dst, dest, destination
* IP address to be blocked according to snort rule (some rules
* are reversed, i.e. homenet -> any [and you want to block any]).
* src denotes IP to the left of -> and dst denotes IP to the right
*
* how: Optional. In, out, src, dest, either, both, this, conn, connection
* Tells SnortSam to block packets INcoming from host, OUTgoing to host,
* EITHERway, or only THIS connection (IP/Service pair).
* See 'fw sam' on Firewall-1 for more information.
* This option may be ignored by other plugins.
*
* time: Duration of block in seconds. (Accepts 'days', 'months', 'weeks',
* 'years', 'minutes', 'seconds', 'hours'. Alternatively, a value of
* 0, or the keyword PERManent, INFinite, or ALWAYS, will block the
* host permanently. Be careful with this!
* Tells SnortSam how long to inhibit packets from the host.
*
* Examples:
*
* 1487: src[either],15min;
* 1292: dst[in], 2 days 4 hours
* 1638: src, 1 hour
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "barnyard2.h"
#include "decode.h"
#include "spo_alert_fwsam.h"
#include "twofish.h"
#include "plugbase.h"
#include "unified2.h"
#include "util.h"
/* just some compatibility stuff */
#ifdef WIN32
#if !defined(_WINSOCKAPI_) && !defined(_WINSOCK2API_)
#include <winsock.h>
#endif
#define waitms(x) Sleep(x)
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <netdb.h>
#ifdef SOLARIS
#include <sys/filio.h>
#endif
typedef int SOCKET;
#ifndef INVALID_SOCKET
#define INVALID_SOCKET -1
#endif
#define waitms(x) usleep((x)*1000)
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE !FALSE
#endif
#ifndef bool
#define bool int
#endif
#if defined(_DEBUG) || defined(DEBUG)
#ifndef FWSAMDEBUG
#define FWSAMDEBUG
#endif
#else
#endif
/* fixed defines */
#define FWSAM_DEFAULTPORT 898 /* Default port if user does not specify one in barnyard2.conf */
/* (Was unused last time I checked...) */
#define FWSAM_PACKETVERSION 14 /* version of the packet. Will increase with enhancements. */
#define FWSAM_STATUS_CHECKIN 1 /* snort to fw */
#define FWSAM_STATUS_CHECKOUT 2
#define FWSAM_STATUS_BLOCK 3
#define FWSAM_STATUS_UNBLOCK 9
#define FWSAM_STATUS_OK 4 /* fw to snort */
#define FWSAM_STATUS_ERROR 5
#define FWSAM_STATUS_NEWKEY 6
#define FWSAM_STATUS_RESYNC 7
#define FWSAM_STATUS_HOLD 8
#define FWSAM_LOG_NONE 0
#define FWSAM_LOG_SHORTLOG 1
#define FWSAM_LOG_SHORTALERT 2
#define FWSAM_LOG_LONGLOG 3
#define FWSAM_LOG_LONGALERT 4
#define FWSAM_LOG (FWSAM_LOG_SHORTLOG|FWSAM_LOG_SHORTALERT|FWSAM_LOG_LONGLOG|FWSAM_LOG_LONGALERT)
#define FWSAM_WHO_DST 8
#define FWSAM_WHO_SRC 16
#define FWSAM_WHO (FWSAM_WHO_DST|FWSAM_WHO_SRC)
#define FWSAM_HOW_IN 32
#define FWSAM_HOW_OUT 64
#define FWSAM_HOW_INOUT (FWSAM_HOW_IN|FWSAM_HOW_OUT)
#define FWSAM_HOW_THIS 128
#define FWSAM_HOW (FWSAM_HOW_IN|FWSAM_HOW_OUT|FWSAM_HOW_THIS)
/* user adjustable defines */
#define FWSAM_REPET_BLOCKS 10 /* Snort remembers this amount of last blocks and... */
#define FWSAM_REPET_TIME 20 /* ...checks if they fall within this time. If so,... */
/* ...the blocking request is not send. */
#define FWSAM_NETWAIT 300 /* 100th of a second. 3 sec timeout for network connections */
#define FWSAM_NETHOLD 6000 /* 100th of a second. 60 sec timeout for holding */
#define SID_MAPFILE "sid-block.map"
#define SID_ALT_MAPFILE "sid-fwsam.map"
#define FWSAM_FANCYFETCH /* This will invoke a fast sid lookup routine */
/* vars */
typedef struct _FWsamstation /* structure of a mgmt station */
{
unsigned short myseqno;
unsigned short stationseqno;
unsigned char mykeymod[4];
unsigned char fwkeymod[4];
unsigned short stationport;
//struct in_addr stationip;
sfip_t stationip;
struct sockaddr_in localsocketaddr;
struct sockaddr_in stationsocketaddr;
TWOFISH *stationfish;
char initialkey[TwoFish_KEY_LENGTH+2];
char stationkey[TwoFish_KEY_LENGTH+2];
time_t lastcontact;
/* time_t sleepstart; */
} FWsamStation;
typedef struct _FWsampacket /* 2 blocks (3rd block is header from TwoFish) */
{
unsigned short endiancheck; /* 0 */
unsigned char srcip[4]; /* 2 */
unsigned char dstip[4]; /* 6 */
unsigned char duration[4]; /* 10 */
unsigned char snortseqno[2]; /* 14 */
unsigned char fwseqno[2]; /* 16 */
unsigned char srcport[2]; /* 18 */
unsigned char dstport[2]; /* 20 */
unsigned char protocol[2]; /* 22 */
unsigned char fwmode; /* 24 */
unsigned char version; /* 25 */
unsigned char status; /* 26 */
unsigned char sig_id[4]; /* 27 */
unsigned char fluff; /* 31 */
} FWsamPacket; /* 32 bytes in size */
typedef struct _FWsampacket2 /* 4 blocks (3rd block is header from TwoFish) */
{
unsigned short endiancheck; /* 0 */
unsigned char srcip[16]; /* 2 */
unsigned char dstip[16]; /* 18 */
unsigned char ipver; /* 34 */
unsigned char duration[4]; /* 35 */
unsigned char snortseqno[2]; /* 39 */
unsigned char fwseqno[2]; /* 41 */
unsigned char srcport[2]; /* 43 */
unsigned char dstport[2]; /* 45 */
unsigned char protocol[2]; /* 47 */
unsigned char fwmode; /* 49 */
unsigned char version; /* 50 */
unsigned char status; /* 51 */
unsigned char sig_id[4]; /* 52 */
unsigned char reserved[7]; /* 56 */
} FWsamPacket2; /* 64 bytes in size */
typedef struct _FWsamoptions /* snort rule options */
{
unsigned long sid;
unsigned long duration;
unsigned char who;
unsigned char how;
unsigned char loglevel;
} FWsamOptions;
typedef struct _FWsamlistpointer
{
FWsamStation *station;
struct _FWsamlistpointer *next;
} FWsamList;
/*
** PROTOTYPES
*/
void AlertFWsamInit(char *args);
void AlertFWsamCleanExitFunc(int signal, void *arg);
void AlertFWsamRestartFunc(int signal, void *arg);
void AlertFWsam(Packet *p, void *event, uint32_t type, void *arg);
int FWsamCheckIn(FWsamStation *station);
void FWsamCheckOut(FWsamStation *station);
void FWsamNewStationKey(FWsamStation *station, FWsamPacket *packet);
void FWsamFixPacketEndian(FWsamPacket *p);
unsigned long FWsamParseDuration(char *p);
void FWsamFree(FWsamList *fwsamlist);
int FWsamStationExists(FWsamStation *who, FWsamList *list);
int FWsamReadLine(char *, unsigned long, FILE *);
void FWsamParseLine(FWsamOptions *, char *);
FWsamOptions *FWsamGetOption(unsigned long);
int FWsamParseOption(FWsamOptions *, char *);
/*
** GLOBALS
*/
/* external globals from rules.c */
extern char *file_name;
extern int file_line;
/* external globals from barnyard.c */
extern Barnyard2Config *barnyard2_conf;
FWsamList *FWsamStationList=NULL; /* Global (for all alert-types) list of snortsam stations */
FWsamOptions *FWsamOptionField=NULL;
unsigned long FWsamMaxOptions=0;
/*
* Function: AlertFWsamSetup()
*
* Purpose: Registers the output plugin keyword and initialization
* function into the output plugin list. This is the function that
* gets called from InitOutputPlugins() in plugbase.c.
* It also registers itself as a plugin in order to parse every rule
* and to set the appropiate flags from fwsam: option.
*
* Arguments: None.
*
* Returns: void function
*
*/
void AlertFWsamSetup(void)
{
/* link the preprocessor keyword to the init function in the preproc list */
RegisterOutputPlugin("alert_fwsam", OUTPUT_TYPE_FLAG__ALERT, AlertFWsamInit);
#ifdef FWSAMDEBUG /* This allows debugging of fwsam only */
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamSetup) Output plugin is plugged in...\n");
#endif
}
/*
* Function: AlertFWsamInit(char *args)
*
* Purpose: Calls the argument parsing function, performs final setup on data
* structs, links the preproc function into the function list.
*
* Arguments: args => ptr to argument string
*
* Returns: void function
*
*/
void AlertFWsamInit(char *args)
{
char *ap;
unsigned long statip,cnt,again,i;
char *stathost, *statport, *statpass;
FWsamStation *station;
FWsamList *fwsamlist=NULL; /* alert-type dependent list of snortsam stations */
FWsamList *listp,*newlistp;
struct hostent *hoste;
char buf[1024]="";
FILE *fp;
FWsamOptions tempopt;
#ifdef FWSAMDEBUG
unsigned long hostcnt=0;
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamInit) Output plugin initializing...\n");
#endif
/* parse the argument list from the rules file */
if(args == NULL)
FatalError("[Alert_FWsam](AlertFWsamInit) No arguments to alert_fwsam preprocessor!\n");
if(!FWsamOptionField && !FWsamMaxOptions)
{
strncpy(buf, barnyard2_conf->config_dir, sizeof(buf)-1);
strncpy(buf+strlen(buf), SID_MAPFILE, sizeof(buf)-strlen(buf)-1);
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamSetup) Using file: %s\n",buf);
#endif
fp=fopen(buf,"rt");
if(!fp)
{
strncpy(buf, barnyard2_conf->config_dir, sizeof(buf)-1);
strncpy(buf+strlen(buf), SID_ALT_MAPFILE, sizeof(buf)-strlen(buf)-1);
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamSetup) Using alternative file: %s\n",buf);
fp=fopen(buf,"rt");
}
if(fp) /* Check for presence of map file and read those in, sorted. */
{
LogMessage("INFO => [Alert_FWsam](AlertFWsamSetup) Using sid-map file: %s\n",buf);
while( FWsamReadLine(buf,sizeof(buf),fp) )
if( *buf )
FWsamMaxOptions++;
if( FWsamMaxOptions )
{
if( (FWsamOptionField=(FWsamOptions *)malloc(sizeof(FWsamOptions)*FWsamMaxOptions)) == NULL )
FatalError("ERROR => [Alert_FWsam](AlertFWsamSetup) malloc failed for OptionField!\n");
fseek(fp,0,SEEK_SET);
for(cnt=0; cnt<FWsamMaxOptions; )
{
FWsamReadLine(buf,sizeof(buf),fp);
if( *buf )
FWsamParseLine(&(FWsamOptionField[cnt++]),buf);
}
if( FWsamMaxOptions>1 )
{
for(again=TRUE,cnt=FWsamMaxOptions-1; cnt>=1 && again; cnt--)
{
for(again=FALSE,i=0; i<cnt; i++)
{
if( FWsamOptionField[i].sid>FWsamOptionField[i+1].sid )
{ memcpy(&tempopt,&(FWsamOptionField[i]),sizeof(FWsamOptions));
memcpy(&(FWsamOptionField[i]),&(FWsamOptionField[i+1]),sizeof(FWsamOptions));
memcpy(&(FWsamOptionField[i+1]),&tempopt,sizeof(FWsamOptions));
again=TRUE;
}
}
}
}
}
else
FWsamMaxOptions=1;
fclose(fp);
}
else
FWsamMaxOptions=1;
}
ap=args; /* start at the beginning of the argument */
while(*ap && isspace(*ap)) ap++;
while(*ap)
{
stathost=ap; /* first argument should be host */
statport=NULL;
statpass=NULL;
while(*ap && *ap!=':' && *ap!='/' && !isspace(*ap)) ap++; /* find token */
switch(*ap)
{
case ':':
*ap++=0; /* grab the port */
statport=ap;
while(*ap && *ap!='/' && !isspace(*ap)) ap++;
if(*ap!='/')
break;
case '/':
*ap++=0; /* grab the key */
statpass=ap;
while(*ap && !isspace(*ap)) ap++;
break;
default:
break;
}
if(*ap)
{
*ap++=0;
while(isspace(*ap)) ap++;
}
/* now we have the first host with port and password (key) */
/* next we check for valid/blank password/port */
if(statpass!=NULL)
if(!*statpass)
statpass=NULL;
if(statport!=NULL)
if(!*statport)
statport=NULL;
statip=0;
/* now we check if a valid host was specified */
if(inet_addr(stathost)==INADDR_NONE)
{
hoste=gethostbyname(stathost);
if (!hoste)
LogMessage("WARNING %s (%d) => [Alert_FWsam](AlertFWsamInit) Unable to resolve host '%s'!\n",file_name,file_line,stathost);
else
statip=*(unsigned long *)hoste->h_addr;
}
else
{
statip=inet_addr(stathost);
if(!statip)
LogMessage("WARNING %s (%d) => [Alert_FWsam](AlertFWsamInit) Invalid host address '%s'!\n",file_name,file_line,stathost);
}
if(statip)
{ /* groovie, a valid host. Let's alloc and assemble the structure for it. */
if((station=(FWsamStation *)malloc(sizeof(FWsamStation)))==NULL)
FatalError("ERROR => [Alert_FWsam](AlertFWsamInit) malloc failed for station!\n");
station->stationip.ip32[0] = statip; /* the IP address */
if(statport!=NULL && atoi(statport)>0) /* if the user specified one */
station->stationport=atoi(statport); /* use users setting */
else
station->stationport=FWSAM_DEFAULTPORT; /* set the default port */
if(statpass!=NULL) /* if specified by user */
strncpy(station->stationkey,statpass,TwoFish_KEY_LENGTH); /* use defined key */
else
station->stationkey[0]=0;
station->stationkey[TwoFish_KEY_LENGTH]=0; /* make sure it's terminated. (damn strncpy...) */
strcpy(station->initialkey,station->stationkey);
station->stationfish=TwoFishInit(station->stationkey);
station->localsocketaddr.sin_port=htons(0); /* let's use dynamic ports for now */
station->localsocketaddr.sin_addr.s_addr=0;
station->localsocketaddr.sin_family=AF_INET;
station->stationsocketaddr.sin_port=htons(station->stationport);
station->stationsocketaddr.sin_addr.s_addr=station->stationip.ip32[0];
station->stationsocketaddr.sin_family=AF_INET; /* load all socket crap and keep for later */
do
station->myseqno=rand(); /* the seqno this host will use */
while(station->myseqno<20 || station->myseqno>65500);
station->mykeymod[0]=rand();
station->mykeymod[1]=rand();
station->mykeymod[2]=rand();
station->mykeymod[3]=rand();
station->stationseqno=0; /* peer hasn't answered yet. */
/* If we don't have the station already in global list....*/
if(!FWsamStationExists(station,FWsamStationList))
{
if(FWsamCheckIn(station)) /* ...and we can talk to the agent... */
{
if((newlistp=(FWsamList *)malloc(sizeof(FWsamList)))==NULL)
FatalError("ERROR => [Alert_FWsam](AlertFWsamInit) malloc failed for global newlistp!\n");
newlistp->station=station;
newlistp->next=NULL;
if(!FWsamStationList) /* ... add it to the global list/ */
FWsamStationList=newlistp;
else
{
listp=FWsamStationList;
while(listp->next)
listp=listp->next;
listp->next=newlistp;
}
}
else
{
TwoFishDestroy(station->stationfish); /* if not, we trash it. */
free(station);
station=NULL;
}
}
#ifdef FWSAMDEBUG
else
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamInit) Host %s:%i already in global list, skipping CheckIn.\n", sfip_ntoa(&station->stationip),station->stationport);
#endif
if(station)
{
/* If we don't have the station already in local list....*/
if(!FWsamStationExists(station,fwsamlist))
{
if((newlistp=(FWsamList *)malloc(sizeof(FWsamList)))==NULL)
FatalError("ERROR => [Alert_FWsam](AlertFWsamInit) malloc failed for local newlistp!\n");
newlistp->station=station;
newlistp->next=NULL;
if(!fwsamlist) /* ... add it to the local list/ */
fwsamlist=newlistp;
else
{
listp=fwsamlist;
while(listp->next)
listp=listp->next;
listp->next=newlistp;
}
}
#ifdef FWSAMDEBUG
else
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamInit) Host %s:%i already in local list, skipping.\n",sfip_ntoa(&station->stationip),station->stationport);
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamInit) #%i: Host %s [%s] port %i password %s\n",++hostcnt,stathost,sfip_ntoa(&station->stationip),station->stationport,station->stationkey);
#endif
}
}
} /* next one */
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamInit) Linking fwsam alert function to call list...\n");
#endif
/* Set the preprocessor function into the function list */
AddFuncToOutputList(AlertFWsam, OUTPUT_TYPE__LOG, fwsamlist);
AddFuncToCleanExitList(AlertFWsamCleanExitFunc, fwsamlist);
AddFuncToRestartList(AlertFWsamRestartFunc, fwsamlist);
}
/* This routine reads in a str from a file, snips white-spaces
* off the front and back, removes comments, and pretties the
* string. Returns true or false if a line was read or not.
*/
int FWsamReadLine(char *buf,unsigned long bufsize,FILE *fp)
{ char *p;
if(fgets(buf,bufsize-1,fp))
{
buf[bufsize-1]=0;
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam](AlertFWsamReadLine) Line: %s\n",buf);
#endif
p=buf;
while(isspace(*p))
p++;
if(p>buf);
strcpy(buf,p);
if(*buf)
{
p=buf+strlen(buf)-1; /* remove leading and trailing spaces */
while(isspace(*p))
*p-- =0;
}
p=buf;
if(*p=='#' || *p==';')
*p=0;
else
p++;
while(*p) /* remove inline comments (except escaped #'s and ;'s) */
{
if(*p=='#' || *p==';')
{
if(*(p-1)=='\\')
strcpy(p-1,p);
else
*p=0;
}
else
p++;
}
return TRUE;
}
return FALSE;
}
/* This function checks if a given snortsam station is already in
* a given list.
*/
int FWsamStationExists(FWsamStation *who,FWsamList *list)
{
while(list)
{
if(list->station)
{
if( IP_EQUALITY(&who->stationip, &list->station->stationip) &&
who->stationport==list->station->stationport )
return TRUE;
}
list=list->next;
}
return FALSE;
}
/* Parses the duration of the argument, recognizing minutes, hours, etc..
*/
unsigned long FWsamParseDuration(char *p)
{ unsigned long dur=0,tdu;
char *tok,c1,c2;
while(*p)
{
tok=p;
while(*p && isdigit(*p))
p++;
if(*p)
{
c1=tolower(*p);
*p=0;
p++;
if(*p && !isdigit(*p))
{
c2=tolower(*p++);
while(*p && !isdigit(*p))
p++;
}
else
c2=0;
tdu=atol(tok);
switch(c1)
{
case 'm':
if(c2=='o') /* month */
tdu*=(60*60*24*30); /* use 30 days */
else
tdu*=60; /* minutes */
break;
case 's':
break; /* seconds */
case 'h':
tdu*=(60*60); /* hours */
break;
case 'd':
tdu*=(60*60*24); /* days */
break;
case 'w':
tdu*=(60*60*24*7); /* week */
break;
case 'y':
tdu*=(60*60*24*365); /* year */
break;
}
dur+=tdu;
}
else
dur+=atol(tok);
}
return dur;
}
/* This routine parses an option line. It is called by FWsamParseLine,
* which parses the sid-block.map file, and also by AlertFWsamOptionInit,
* which is called by Snort when processing fwsam: options in rules.
* It returns TRUE it there is a possible option problem, otherwise FALSE.
*/
int FWsamParseOption(FWsamOptions *optp,char *ap)
{
int possprob=FALSE;
/* set defaults */
optp->duration=300; /* default of 5 minute block */
optp->how=FWSAM_HOW_INOUT; /* inbound and outbound block */
optp->who=FWSAM_WHO_SRC; /* the source */
optp->loglevel=FWSAM_LOG_LONGALERT; /* the log level default */
/* parse the fwsam keywords */
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam](AlertFWamOptionInit) Parse Options Args: %s\n",ap);
#endif
if(*ap) /* should be dst/src (the WHO) or duration */
{
if(isdigit(*ap))
optp->duration=FWsamParseDuration(ap);
else
{
switch(*ap) /* yeah, we're lazy and check only the first character */
{
case 'p': /* permanent, perm */
case 'f': /* forever */
case 'i': /* infinite, inf */
optp->duration=0;
break;
case 'd': /* destination, dest, dst */
optp->who=FWSAM_WHO_DST;
break;
case 's': /* source, src */
optp->who=FWSAM_WHO_SRC;
break;
default:
possprob=TRUE;
}
while(*ap && *ap!=',' && *ap!='[')
ap++;
if(*ap=='[')
{ ap++; /* now we have the HOW */
switch(*ap)
{
case 'i': /* in */
case 's': /* source, src */
optp->how=FWSAM_HOW_IN;
break;
case 'o': ; /* out */
case 'd': /* destination, dest, dst */
optp->how=FWSAM_HOW_OUT;
break;
case 'b': ; /* both */
case 'e': /* either */
optp->how=FWSAM_HOW_INOUT;
break;
case 't': ; /* this */
case 'c': /* connection, conn */
optp->how=FWSAM_HOW_THIS;
break;
default:
possprob=TRUE;
}
while(*ap && *ap!=',')
ap++;
}
if(*ap==',')
{
ap++;
if(isdigit(*ap)) /* and figure out how long to block */
optp->duration=FWsamParseDuration(ap);
else if(*ap=='p' || *ap=='f' || *ap=='i')
optp->duration=0;
else
possprob=TRUE;
}
else if(!*ap)
possprob=TRUE;
}
}
else
possprob=TRUE;
return possprob;
}
/* This goes through the lines of sid-block.map and sets the
* options for fwsam if the file is being used.
*/
void FWsamParseLine(FWsamOptions *optp,char *buf)
{
char *ap;
ap=buf; /* start at the beginning of the argument */
while(*ap)
{
if(isspace(*ap)) /* normalize spaces (tabs into space, etc) */
*ap=' ';
if(isupper(*ap)) /* and set to lower case */
*ap=tolower(*ap);
ap++;
}
while((ap=strrchr(buf,' '))!=NULL) /* remove spaces */
strcpy(ap,ap+1);
ap=buf;
if(*ap)
{
while(*ap && *ap!=':' && *ap!='|') ap++;
*ap++ =0;
while(*ap && (*ap==':' || *ap=='|')) ap++;
optp->sid=(unsigned long)atol(buf);
if(FWsamParseOption(optp,ap))
LogMessage("WARNING %s (%d) => [Alert_FWsam](AlertFWamOptionInit) Possible option problem. Using %s[%s],%lu.\n",file_name,file_line,(optp->who==FWSAM_WHO_SRC)?"src":"dst",(optp->how==FWSAM_HOW_IN)?"in":((optp->how==FWSAM_HOW_OUT)?"out":"either"),optp->duration);
}
else
optp->sid=0;
}
/* Generates a new encryption key for TwoFish based on seq numbers and a random that
* the SnortSam agents send on checkin (in protocol)
*/
void FWsamNewStationKey(FWsamStation *station,FWsamPacket *packet)
{
char newkey[TwoFish_KEY_LENGTH+2];
int i;
newkey[0]=packet->snortseqno[0]; /* current snort seq # (which both know) */
newkey[1]=packet->snortseqno[1];
newkey[2]=packet->fwseqno[0]; /* current SnortSam seq # (which both know) */
newkey[3]=packet->fwseqno[1];
newkey[4]=packet->protocol[0]; /* the random SnortSam chose */
newkey[5]=packet->protocol[1];
strncpy(newkey+6,station->stationkey,TwoFish_KEY_LENGTH-6); /* append old key */
newkey[TwoFish_KEY_LENGTH]=0;
newkey[0]^=station->mykeymod[0]; /* modify key with key modifiers which were */
newkey[1]^=station->mykeymod[1]; /* exchanged during the check-in handshake. */
newkey[2]^=station->mykeymod[2];
newkey[3]^=station->mykeymod[3];
newkey[4]^=station->fwkeymod[0];
newkey[5]^=station->fwkeymod[1];
newkey[6]^=station->fwkeymod[2];
newkey[7]^=station->fwkeymod[3];
for(i=0;i<=7;i++)
if(newkey[i]==0)
newkey[i]++;
strcpy(station->stationkey,newkey);
TwoFishDestroy(station->stationfish);
station->stationfish=TwoFishInit(newkey);
}
#ifdef FWSAMDEBUG
/* This does nothing else than inet_ntoa, but it keeps 4 results in a static string
* unlike inet_ntoa which keeps only one. This is used for (s)printf's were two IP
* addresses are printed.
*/
char *inettoa(unsigned long ip)
{
struct in_addr ips;
static char addr[4][20];
static unsigned char toggle;
ips.s_addr=ip;
toggle=(toggle+1)&3;
strncpy(addr[toggle],inet_ntoa(ips),18);
return addr[toggle];
}
#endif
/* This routing will search the option list as defined
* by the sid-block.map file and return a pointer
* to the matching record.
*/
FWsamOptions *FWsamGetOption(unsigned long sid)
{
signed long i,step,diff,o,o2;
#ifdef FWSAM_FANCYFETCH /* Fancy-fetch jumps in decreasing n/2 steps and takes much less lookups */
o=o2= -1;
i=step=FWsamMaxOptions>>1;
while(i>=0 && i<FWsamMaxOptions && i!=o2)
{
diff=sid-FWsamOptionField[i].sid;
if(!diff)
return &(FWsamOptionField[i]);
if(step>1)
step=step>>1;
o2=o;
o=i;
if(diff>0)
i+=step;
else
i-=step;
}
#else /* This is just a sequential list lookup */
for(i=0;i<FWsamMaxOptions;i++)
if(FWsamOptionField[i].sid==sid)
return &(FWsamOptionField[i]);
#endif
return NULL;
}
/****************************************************************************
*
* Function: AlertFWsam(Packet *, char *)
*
* Purpose: Send the current alert to a remote module on a FW-1 mgmt station
*
* Arguments: p => pointer to the packet data struct
* msg => the message to print in the alert
*
* Returns: void function
*
***************************************************************************/
void AlertFWsam(Packet *p, void *event, uint32_t event_type, void *arg)
{
FWsamOptions *optp;
FWsamPacket sampacket;
FWsamStation *station=NULL;
FWsamList *fwsamlist;
SOCKET stationsocket;
int i,len,deletestation,stationtry=0;
char *encbuf,*decbuf;
static unsigned long lastbsip[FWSAM_REPET_BLOCKS];
static unsigned long lastbdip[FWSAM_REPET_BLOCKS];
static unsigned long lastbduration[FWSAM_REPET_BLOCKS];
static unsigned long lastbtime[FWSAM_REPET_BLOCKS];
static unsigned short lastbsp[FWSAM_REPET_BLOCKS];
static unsigned short lastbdp[FWSAM_REPET_BLOCKS];
static unsigned short lastbproto[FWSAM_REPET_BLOCKS];
static unsigned short lastbpointer;
static unsigned char lastbmode[FWSAM_REPET_BLOCKS];
static unsigned long btime=0;
SigNode *sn = NULL;
ClassType *cn = NULL;
/*
** Remove Compiler warning.
ReferenceNode *rn = NULL;
*/
if(event==NULL)
{
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam] NULL event!\n");
#endif
return;
}
if(p == NULL)
{
#ifdef FWSAMDEBUG
LogMessage("DEBUG => [Alert_FWsam] NULL packet!\n");
#endif
return;
}