hi_ad.c

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/**
**  @file       hi_ad.c
**
**  @author     Daniel Roelker <droelker@sourcefire.com>
**
**  @brief      This is the server anomaly module file.  Looks for anomalous
**              servers and other stuff.  Still thinking about it.
**
**  NOTES:
**    - 3.2.03:  Initial development.  DJR
*/
#include <stdlib.h>
#include <sys/types.h>

#include "hi_ui_config.h"
#include "hi_return_codes.h"
#include "hi_eo_log.h"
#include "hi_si.h"

/*
**  NAME
**    hi_server_anomaly_detection::
*/
/**
**  Inspect packet/streams for anomalous server detection and tunneling.
**
**  This really checks for anything that we want to look at for rogue
**  HTTP servers, HTTP tunneling in unknown servers, and detection of
**  sessions that are actually talking HTTP.
**
**  @param Session pointer to the session there is no server conf
**  @param data    unsigned char to payload/stream data
**  @param dsize   the size of the payload/stream data
**
**  @return integer
**
**  @retval HI_SUCCESS function successful
*/
int hi_server_anomaly_detection(void *S, u_char *data, int dsize)
{
    HI_SESSION *Session = (HI_SESSION *)S;
    HTTPINSPECT_GLOBAL_CONF *GlobalConf;

    if(data == NULL || dsize < 1)
        return HI_INVALID_ARG;

    GlobalConf = Session->global_conf;

    /*
    **  We are just going to look for server responses on non-HTTP
    **  ports.
    */
    if(GlobalConf->anomalous_servers && dsize > 5)
    {
        /*
        **  We now do the checking for anomalous HTTP servers
        */
        if(data[0]=='H' && data[1]=='T' && data[2]=='T' && data[3]=='P' &&
           data[4]=='/')
        {
            hi_eo_anom_server_event_log(Session, HI_EO_ANOM_SERVER,
                                        NULL, NULL);
        }
    }

    return HI_SUCCESS;
}

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