cfuzz/authFuzzer/AUTHGEN/AUTHoversize.c

/*
Fuzzes AuthResp by testing overflow
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "../frameDefinitions.h"

//Creates Probe response frame
u_char *Authoversize(u_char *dstAddress, int *packetSize, u_char * radioTapHeader, u_char *myMAC, int step)
{

    #define AuthoversizeIES  (6)   //number of information elements

    //definition of all info elements 
    infoElem base255;

    base255.id = 1;
    base255.len = 255;
    base255.len_data = 255;
    u_char *data = malloc(255);
    memset(data, 0xff, 255);
    base255.data = data;


    infoElem lastBit;

    lastBit.id = 127;
    lastBit.len = 151-step;
    lastBit.len_data = 151-step;
    u_char *data2 = malloc(151-step);
    memset(data2, 0xff, 151-step);
    lastBit.data = data2;


    //create array of information elements
    infoElem taggedParams[AuthoversizeIES] = {
        base255, base255, base255, base255, base255, lastBit
    };

    //length of all info elements, including id and len field
    int len_taggedParams = 0;
    for(int i = 0; i < AuthoversizeIES; i++)
    {
        if (taggedParams[i].len_data != -1) //do not include when len_data == -1
        {
            //+2 to include id and len field size
            len_taggedParams = len_taggedParams + taggedParams[i].len_data+2; 
        }
    }

    //fill in struct
    authResponse authResp = { 
        36, radioTapHeader,                //RadioTap hdr
        1, "\xb0",                         //Type
        1, "\x00",                         //Subtype
        2, "\x3a\x01",                     //Duration
        6, dstAddress,                     //DST addr
        6, myMAC,                          //Source addr
        6, myMAC,                          //BSS addr
        2, "\x00\x00",                     //Seq nr         (overwritten by firmware)
        2, "\x00\x00",                     //Auth alg
        2, "\x02\x00",                     //Auth seq
        2, "\x00\x00",                     //Status code

        len_taggedParams,
        taggedParams,                      //Information elements

        4, "\x00\x00\x00\x00"              //FSC            (overwritten by firmware)
    };

    //calculate size of final packet
    *packetSize = authResp.len_radioTapHdr 
                + authResp.len_type
                + authResp.len_flags
                + authResp.len_duration
                + authResp.len_destAddr
                + authResp.len_sourceAddr
                + authResp.len_bssAddr
                + authResp.len_seqNr
                + authResp.len_authAlg
                + authResp.len_authSeq
                + authResp.len_status
                + authResp.len_taggedParams
                + authResp.len_fsc;

    //define packet
    u_char *authRespPacket = malloc(*packetSize);
    if(!authRespPacket)
    {
        printf("Memory allocation error!\n");
        exit(-1);
    }

    //copy all struct fields into packet
    int copyOffset = 0;

    memcpy(authRespPacket + copyOffset, authResp.radioTapHdr, authResp.len_radioTapHdr);
    copyOffset = copyOffset + authResp.len_radioTapHdr;

    memcpy(authRespPacket + copyOffset, authResp.type, authResp.len_type);
    copyOffset = copyOffset + authResp.len_type;

    memcpy(authRespPacket + copyOffset, authResp.flags, authResp.len_flags);
    copyOffset = copyOffset + authResp.len_flags;

    memcpy(authRespPacket + copyOffset, authResp.duration, authResp.len_duration);
    copyOffset = copyOffset + authResp.len_duration;

    memcpy(authRespPacket + copyOffset, authResp.destAddr, authResp.len_destAddr);
    copyOffset = copyOffset + authResp.len_destAddr;

    memcpy(authRespPacket + copyOffset, authResp.sourceAddr, authResp.len_sourceAddr);
    copyOffset = copyOffset + authResp.len_sourceAddr;

    memcpy(authRespPacket + copyOffset, authResp.bssAddr, authResp.len_bssAddr);
    copyOffset = copyOffset + authResp.len_bssAddr;

    memcpy(authRespPacket + copyOffset, authResp.seqNr, authResp.len_seqNr);
    copyOffset = copyOffset + authResp.len_seqNr;

    memcpy(authRespPacket + copyOffset, authResp.authAlg, authResp.len_authAlg);
    copyOffset = copyOffset + authResp.len_authAlg;

    memcpy(authRespPacket + copyOffset, authResp.authSeq, authResp.len_authSeq);
    copyOffset = copyOffset + authResp.len_authSeq;

    memcpy(authRespPacket + copyOffset, authResp.status, authResp.len_status);
    copyOffset = copyOffset + authResp.len_status;

    //copy all information elements
    for(int i = 0; i < AuthoversizeIES; i++)
    {
        if (taggedParams[i].len_data != -1)  //if id == -1, we do not want to include the information element
        {
            memcpy(authRespPacket + copyOffset, &taggedParams[i].id, 1);
            copyOffset = copyOffset + 1;

            memcpy(authRespPacket + copyOffset, &taggedParams[i].len, 1);
            copyOffset = copyOffset + 1;

            memcpy(authRespPacket + copyOffset, taggedParams[i].data, taggedParams[i].len_data);
            copyOffset = copyOffset + taggedParams[i].len_data;
        }
    }
        

    memcpy(authRespPacket + copyOffset, authResp.fsc, authResp.len_fsc);
    copyOffset = copyOffset + authResp.len_fsc;

    //send packet
    return authRespPacket;    
}