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/*
weplab - Wep Key Cracker
Copyright (C) 2004 Jose Ignacio Sanchez Martin - Topo[LB]
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, 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.
---------
dictionary.c: dictionary based wep crack.
*/
#include <pcap.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include "md5.h"
#include "wep.h"
#include "globals.h"
#include "debug.h"
#include "dictionary.h"
#include "attack.h"
/* This section of the code was riped from the wep_tools archive from Tim Newsham
* http://lava.net/~newsham/wlan/
*/
#define WEPWEAKKEYSIZE 5
#define WEPSTRONGKEYSIZE 13
#define WEPKEYS 4
#define WEPKEYSTORE (WEPWEAKKEYSIZE * WEPKEYS)
/*
* generate four subkeys from a seed using the defacto standard
*/
void wep_seedkeygen40(int val, u_char *keys){
int i;
for(i = 0; i < WEPKEYSTORE; i++) {
val *= 0x343fd;
val += 0x269ec3;
keys[i] = val >> 16;
}
return;
}
/*
* generate one key from a string using the de facto standard
*
* resultant key is stored in
* one 128 bit key: keys[0-12]
*/
void wep_keygen128(char *str, unsigned char *keys){
struct MD5Context ctx;
unsigned char buf[64];
int i, j;
/* repeat str until buf is full */
j = 0;
for(i = 0; i < 64; i++) {
if(str[j] == 0)
j = 0;
buf[i] = str[j++];
}
MD5Init(&ctx);
MD5Update(&ctx, buf, sizeof buf);
MD5Final(buf, &ctx);
memcpy(keys, buf, WEPKEYSTORE);
for(i = 0; i < WEPSTRONGKEYSIZE; i++) {
keys[i] = buf[i];
}
for(; i < WEPKEYSTORE; i++) {
keys[i] = 0;
}
return;
}
/*
* generate four subkeys from a string using the defacto standard
*
* resultant keys are stored in keys[0-4], keys[5-9], keys[10-14]
* and keys[15-20]
*/
void wep_keygen40(char *str, u_char *keys){
int val, i, shift;
/*
* seed is generated by xor'ing in the keystring bytes
* into the four bytes of the seed, starting at the little end
*/
val = 0;
for(i = 0; str[i]; i++) {
shift = i & 0x3;
val ^= (str[i] << (shift * 8));
}
wep_seedkeygen40(val, keys);
return;
}
/* End of ripped code section. We are back to my horrible coding style ;) */
unsigned long int dtotalTests=0;
short ndTotalTests=0;
unsigned char keys[WEPKEYSTORE];
unsigned char last_keys[WEPKEYSTORE];
time_t initialTime;
time_t lastTime;
time_t actualTime;
int WEPKeyID=0;
pid_t arrayProcesses[64];
int dcurrentProcessNumber=0;
FILE* wordfile;
int GetNextWord(unsigned char *word, int sz){
int i;
char* rv=NULL;
bzero(word, sz);
while (((rv=fgets(word, sz-1, wordfile))!=NULL)&&((word[0]=='\r')||(word[0]=='\n'))) {
/* We didn't get valuable data :( */
;
}
for (i=1; i<=sz-1; i++)
/* We turn CR and LF to '\0' because fgets likes to put them in our buffer */
if((word[i]=='\n')||(word[i]=='\r')) {
word[i]=0;
break;
}
return (rv == NULL)?-1:0;
}
void catch_dint(int sig_num){
int i;
if (!dcurrentProcessNumber) for (i=1; i<global_v.processes; i++) kill(arrayProcesses[i],SIGUSR1);
signal(SIGUSR1, catch_dint);
actualTime=time(NULL);
printf("Process number: %u ===>",dcurrentProcessNumber);
if (!ndTotalTests) printf(" %lu keys tested [",dtotalTests);
else printf(" %d * %lu keys tested [",ndTotalTests, dtotalTests);
if (actualTime-lastTime) printf("%lu c/s] >>> ",(unsigned long int)dtotalTests/(actualTime-lastTime));
if (defaultAttacks[STABILITY_LEVELS][1]) printf(" s:\"%s\" ", last_keys);
else if (global_v.key_len == WEPWEAKKEYSIZE) {
printf("Key index: %d, ", WEPKeyID);
ViewKey (&last_keys[WEPKeyID*5], global_v.key_len);
}
else ViewKey (last_keys, global_v.key_len);
printf("\n");
}
void dictionary (void){
t_storedPacket *packets[10];
unsigned char word[100];
pcap_t *file;
pid_t mpid;
int i;
int c;
int totalPackets;
//unsigned char key2[13]="\x3e\x9a\xa0\xa4\xc6\x2e\xad\x59\x5a\x07\xa1\x80\x1f";
int trues;
int totalByte=0xFF;
int totalTemp=0;
#ifdef _DEBUG
debug("Starting Dictionary based cracking.");
#endif
file=OpenPcapFile(global_v.packetsFilename);
signal(SIGUSR1,SIG_IGN);
/* We could be able to use other file than STDIN by fopen'ing */
if (!strcmp(global_v.wordfile,"")) wordfile=stdin;
else{
wordfile=fopen(global_v.wordfile,"r");
if (wordfile==NULL){
printf("\n ERROR opening the wordfile %s for reading\n\n",global_v.wordfile);
exit(1);
}
}
for (i=0; i<10; i++) {
packets[i]=malloc(sizeof(t_storedPacket));
packets[i]->packet=NULL;
}
totalPackets=GetLessSizedPackets(file, packets);
DebugView10Packets(packets, totalPackets);
ClosePcapFile(file);
for (i=0; i<global_v.key_len; i++) keys[i]=0;
dcurrentProcessNumber=0;
if ((global_v.key_len == WEPWEAKKEYSIZE) && ( !defaultAttacks[STABILITY_LEVELS][1] )) {
/* Let's find the index of the WEP Key of this packet because we are going to use the 40bits hash generator */
for (i=1;i<10;i++) {
WEPKeyID=0;
memcpy(&WEPKeyID, packets[i]+LEN_IV, LEN_ID);
printf("The id for the packet number %d is %d\n", i, WEPKeyID);
}
memcpy(&WEPKeyID, packets[0]+LEN_IV, LEN_ID);
WEPKeyID=WEPKeyID&0x3;
printf("The id for the first packet is %d\n", WEPKeyID);
}
// TEST
initialTime=time(NULL);
lastTime=time(NULL);
if (!dcurrentProcessNumber) mpid=fork();
else mpid=0;
if (!(mpid)){
signal(SIGUSR1, catch_dint);
while (1){
if (!++dtotalTests){
lastTime=time(NULL);
ndTotalTests++;
}
//ViewKey(keys, global_v.key_len); printf("\n");
if ( (global_v.key_len == WEPWEAKKEYSIZE) && ( !defaultAttacks[STABILITY_LEVELS][1]) ) {
if (VerifyPacketWithKey(packets[0], &keys[WEPKeyID*5] )){
printf("It seems that the first control data packet verifies the key! Let's test it with others....\n");
trues=0;
for (i=1;i<10;i++) {
WEPKeyID=0;
memcpy(&WEPKeyID, packets[i]+LEN_IV, LEN_ID);
printf("The id for the packet number %d is %d\n", i, WEPKeyID);
if (VerifyPacketWithKey(packets[i], &keys[WEPKeyID*5] )) trues++;
}
if (trues) {
printf("Right KEY found!! (verify score : %d)\n", trues);
printf("Passphrase was --> %s\n",word);
ViewKey(keys, global_v.key_len);
exit(1);
}
}
} else if (VerifyPacketWithKey(packets[0], keys )){
printf("It seems that the first control data packet verifies the key! Let's test it with others....\n");
if (Verify10PacketsWithKey(packets, keys )>2){
printf("Right KEY found!!\n");
printf("Passphrase was --> %s\n",word);
ViewKey(keys, global_v.key_len);
exit(1);
}
}
if((GetNextWord(word, sizeof(word)))==-1) {
/* We have reached the end of the file, let's print stats and quit */
kill(getpid(), SIGUSR1);
exit(1);
}
/* Find which kind of attack we are asked to perform */
if (defaultAttacks[STABILITY_LEVELS][1]) {
/* We are asked to perform basic ascii test
* We just have to backup the last key for the SIGUSR1 catching function that will print the last word */
bzero(keys, global_v.key_len+1);
strncpy(keys, word, global_v.key_len);
bzero(last_keys, global_v.key_len+1);
strcpy(last_keys, keys);
if (global_v.debug >1) {
printf("We generate this ");
ViewKey (keys, global_v.key_len);
}
} else {
/* We work with real world key generation algorithm */
if (global_v.key_len == WEPSTRONGKEYSIZE) {
wep_keygen128(word, keys);
if (global_v.debug >1) {
printf("We generate this ");
ViewKey (keys, global_v.key_len);
}
} else {
wep_keygen40(word, keys);
if (global_v.debug >1) {
printf("We generate these four keys : \n");
printf("Index 1 - ");
ViewKey (keys, global_v.key_len);
printf("Index 2 - ");
ViewKey (&keys[5], global_v.key_len);
printf("Index 3 - ");
ViewKey (&keys[10], global_v.key_len);
printf("Index 4 - ");
ViewKey (&keys[15], global_v.key_len);
printf("..... end\n");
}
}
memcpy(last_keys, keys, WEPKEYSTORE);
}
}
}else{
//fclose(wordfile);
arrayProcesses[0]=mpid;
printf("\n\nStatistical cracking started! Please hit enter to get statistics from John.\nWeplab statistics will be printed each 5 seconds\n\n");
while (!waitpid(0,NULL,WNOHANG)) {
if (wordfile != stdin){
c=getchar();
}
else {
/* We can't wait for keyboard input as we are reading the dictionnary file from stdin !
* So we just sleep 10 seconds and print stats */
sleep(5);
c='\n';
}
if (c=='\n') kill(mpid,SIGUSR1);
}
printf("This was the end of the dictionnary attack.\n");
}
trues=Verify10PacketsWithKey(packets, keys /* XXX */ );
if (trues) printf("HURRA! %d packets verified the key!",trues);
}
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