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wdecrypt.cpp
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wdecrypt.cpp
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/*
* 802.11 to Ethernet pcap translator
*
* Copyright (C) 2006-2016 Thomas d'Otreppe <[email protected]>
* Copyright (C) 2004, 2005 Christophe Devine
*
* 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
*
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. * If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. * If you
* do not wish to do so, delete this exception statement from your
* version. * If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <getopt.h>
#include <pcap.h>
extern "C" {
#include "version.h"
#include "crypto.h"
#include "osdep/byteorder.h"
#include "common.h"
}
#define CRYPT_NONE 0
#define CRYPT_WEP 1
#define CRYPT_WPA 2
#define LINKTYPE_PRISM_HEADER 119
#define LINKTYPE_RADIOTAP_HDR 127
#define LINKTYPE_PPI_HDR 192
#define TCPDUMP_MAGIC 0xA1B2C3D4
#define TCPDUMP_CIGAM 0xD4C3B2A1
//#define IVSONLY_MAGIC "\xBF\xCA\x84\xD4"
//#define IVS2_MAGIC "\xAE\x78\xD1\xFF"
//#define IVS2_EXTENSION "ivs"
//#define IVS2_VERSION 1
extern char * getVersion(char * progname, int maj, int min, int submin, int svnrev, int beta, int rc);
extern int check_crc_buf( unsigned char *buf, int len );
extern int calc_crc_buf( unsigned char *buf, int len );
char usage[] =
"\n"
" %s - (C) 2006-2015 Thomas d\'Otreppe\n"
" http://www.aircrack-ng.org\n"
"\n"
" usage: airdecap-ng [options] <pcap file>\n"
"\n"
" Common options:\n"
" -l : don't remove the 802.11 header\n"
" -b <bssid> : access point MAC address filter\n"
" -e <essid> : target network SSID\n"
" -o <fname> : output file for decrypted packets (default <src>-dec)\n"
"\n"
" WEP specific option:\n"
" -w <key> : target network WEP key in hex\n"
" -c <fname> : output file for corrupted WEP packets (default <src>-bad)\n"
"\n"
" WPA specific options:\n"
" -p <pass> : target network WPA passphrase\n"
" -k <pmk> : WPA Pairwise Master Key in hex\n"
"\n"
" --help : Displays this usage screen\n"
"\n";
struct decap_stats
{
unsigned long nb_read; /* # of packets read */
unsigned long nb_wep; /* # of WEP data packets */
unsigned long nb_bad; /* # of bad data packets */
unsigned long nb_wpa; /* # of WPA data packets */
unsigned long nb_plain; /* # of plaintext packets */
unsigned long nb_unwep; /* # of decrypted WEP pkt */
unsigned long nb_unwpa; /* # of decrypted WPA pkt */
}
stats;
struct options
{
int no_convert;
char essid[36];
char passphrase[65];
unsigned char bssid[6];
unsigned char pmk[40];
unsigned char wepkey[64];
int weplen, crypt;
int store_bad;
char decrypted_fpath[65536];
char corrupted_fpath[65536];
}
opt;
unsigned char buffer[65536];
unsigned char buffer2[65536];
/* this routine handles to 802.11 to Ethernet translation */
int write_packet( pcap_t *f_out, struct pcap_pkthdr *pkh, unsigned char *h80211 )
{
unsigned char arphdr[12];
int qosh_offset = 0;
if( opt.no_convert )
{
if( buffer != h80211 )
memcpy( buffer, h80211, pkh->caplen );
}
else
{
/* create the Ethernet link layer (MAC dst+src) */
switch( h80211[1] & 3 )
{
case 0: /* To DS = 0, From DS = 0: DA, SA, BSSID */
memcpy( arphdr + 0, h80211 + 4, 6 );
memcpy( arphdr + 6, h80211 + 10, 6 );
break;
case 1: /* To DS = 1, From DS = 0: BSSID, SA, DA */
memcpy( arphdr + 0, h80211 + 16, 6 );
memcpy( arphdr + 6, h80211 + 10, 6 );
break;
case 2: /* To DS = 0, From DS = 1: DA, BSSID, SA */
memcpy( arphdr + 0, h80211 + 4, 6 );
memcpy( arphdr + 6, h80211 + 16, 6 );
break;
default: /* To DS = 1, From DS = 1: RA, TA, DA, SA */
memcpy( arphdr + 0, h80211 + 16, 6 );
memcpy( arphdr + 6, h80211 + 24, 6 );
break;
}
/* check QoS header */
if ( GET_SUBTYPE(h80211[0]) == IEEE80211_FC0_SUBTYPE_QOS ) {
qosh_offset += 2;
}
/* remove the 802.11 + LLC header */
if( ( h80211[1] & 3 ) != 3 )
{
pkh->len -= 24 + qosh_offset + 6;
pkh->caplen -= 24 + qosh_offset + 6;
/* can overlap */
memmove( buffer + 12, h80211 + qosh_offset + 30, pkh->caplen );
}
else
{
pkh->len -= 30 + qosh_offset + 6;
pkh->caplen -= 30 + qosh_offset + 6;
memmove( buffer + 12, h80211 + qosh_offset + 36, pkh->caplen );
}
memcpy( buffer, arphdr, 12 );
pkh->len += 12;
pkh->caplen += 12;
}
int res = pcap_sendpacket(f_out, (const u_char*)buffer, pkh->caplen);
if (res == -1) {
printf("pcap_sendpacket return -1\n");
return( 1 );
}
return( 0 );
}
int main( int argc, char *argv[] )
{
time_t tt;
unsigned magic;
char *s, buf[128];
pcap_t *f_in;
pcap_t *f_out;
FILE *f_bad=NULL;
unsigned long crc;
int i = 0, n, linktype;
unsigned z;
unsigned char ZERO[32], *h80211;
unsigned char bssid[6], stmac[6];
struct WPA_ST_info *st_1st;
struct WPA_ST_info *st_cur;
struct WPA_ST_info *st_prv;
struct pcap_pkthdr pkh;
#ifdef USE_GCRYPT
// Disable secure memory.
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
// Tell Libgcrypt that initialization has completed.
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
#endif
/* parse the arguments */
memset( ZERO, 0, sizeof( ZERO ) );
memset( &opt, 0, sizeof( opt ) );
while( 1 )
{
int option_index = 0;
static struct option long_options[] = {
{"bssid", 1, 0, 'b'},
{"debug", 1, 0, 'd'},
{"help", 0, 0, 'H'},
{0, 0, 0, 0 }
};
int option = getopt_long( argc, argv, "lb:k:e:o:p:w:c:H",
long_options, &option_index );
if( option < 0 ) break;
switch( option )
{
case ':' :
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
case '?' :
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
case 'l' :
opt.no_convert = 1;
break;
case 'b' :
i = 0;
s = optarg;
while( sscanf( s, "%x", &n ) == 1 )
{
if( n < 0 || n > 255 )
{
printf( "Invalid BSSID (not a MAC).\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.bssid[i] = n;
if( ++i >= 6 ) break;
if( ! ( s = strchr( s, ':' ) ) )
break;
s++;
}
if( i != 6 )
{
printf( "Invalid BSSID (not a MAC).\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
break;
case 'k' :
if( opt.crypt != CRYPT_NONE )
{
printf( "Encryption key already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.crypt = CRYPT_WPA;
i = 0;
s = optarg;
buf[0] = s[0];
buf[1] = s[1];
buf[2] = '\0';
while( sscanf( buf, "%x", &n ) == 1 )
{
if( n < 0 || n > 255 )
{
printf( "Invalid WPA PMK.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.pmk[i++] = n;
if( i >= 32 ) break;
s += 2;
if( s[0] == ':' || s[0] == '-' )
s++;
if( s[0] == '\0' || s[1] == '\0' )
break;
buf[0] = s[0];
buf[1] = s[1];
}
if( i != 32 )
{
printf( "Invalid WPA PMK.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
break;
case 'e' :
if ( opt.essid[0])
{
printf( "ESSID already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
memset( opt.essid, 0, sizeof( opt.essid ) );
strncpy( opt.essid, optarg, sizeof( opt.essid ) - 1 );
break;
case 'o' :
if ( opt.decrypted_fpath[0])
{
printf( "filename for decrypted packets already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
strncpy( opt.decrypted_fpath, optarg, sizeof( opt.decrypted_fpath ) - 1 );
break;
case 'c' :
if ( opt.corrupted_fpath[0])
{
printf( "filename for corrupted packets already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
strncpy( opt.corrupted_fpath, optarg, sizeof( opt.corrupted_fpath ) - 1 );
break;
case 'p' :
if( opt.crypt != CRYPT_NONE )
{
printf( "Encryption key already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.crypt = CRYPT_WPA;
memset( opt.passphrase, 0, sizeof( opt.passphrase ) );
strncpy( opt.passphrase, optarg, sizeof( opt.passphrase ) - 1 );
break;
case 'w' :
if( opt.crypt != CRYPT_NONE )
{
printf( "Encryption key already specified.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.crypt = CRYPT_WEP;
i = 0;
s = optarg;
buf[0] = s[0];
buf[1] = s[1];
buf[2] = '\0';
while( sscanf( buf, "%x", &n ) == 1 )
{
if( n < 0 || n > 255 )
{
printf( "Invalid WEP key.\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.wepkey[i++] = n;
if( i >= 64 ) break;
s += 2;
if( s[0] == ':' || s[0] == '-' )
s++;
if( s[0] == '\0' || s[1] == '\0' )
break;
buf[0] = s[0];
buf[1] = s[1];
}
if( i != 5 && i != 13 && i != 16 && i != 29 && i != 61 )
{
printf( "Invalid WEP key length. [5,13,16,29,61]\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
opt.weplen = i;
break;
case 'H' :
printf( usage, getVersion("Airdecap-ng", _MAJ, _MIN, _SUB_MIN, _REVISION, _BETA, _RC));
return( 1 );
default : goto usage;
}
}
if( argc - optind != 1 )
{
if(argc == 1)
{
usage:
printf( usage, getVersion("Airdecap-ng", _MAJ, _MIN, _SUB_MIN, _REVISION, _BETA, _RC));
}
if( argc - optind == 0)
{
printf("No file to decrypt specified.\n");
}
if(argc > 1)
{
printf("\"%s --help\" for help.\n", argv[0]);
}
return( 1 );
}
if( opt.crypt == CRYPT_WPA )
{
if( opt.passphrase[0] != '\0' )
{
/* compute the Pairwise Master Key */
if( opt.essid[0] == '\0' )
{
printf( "You must also specify the ESSID (-e).\n" );
printf("\"%s --help\" for help.\n", argv[0]);
return( 1 );
}
calc_pmk( opt.passphrase, opt.essid, opt.pmk );
}
}
char errbuf[PCAP_ERRBUF_SIZE];
if ((f_in = pcap_open_offline(argv[optind], errbuf)) == NULL)
{
if ((f_in = pcap_open_live(argv[optind], 65535, 1, 1, errbuf)) == NULL)
{
perror( "pcap_open failed\n" );
printf( "Could not open \"%s\".\n", argv[optind] );
return( 1 );
}
}
linktype = pcap_datalink(f_in);
n = strlen( argv[optind] );
if( n > 4 && ( n + 5 < (int) sizeof( buffer ) ) &&
argv[optind][n - 4] == '.' )
{
memcpy( buffer , argv[optind], n - 4 );
memcpy( buffer2, argv[optind], n - 4 );
memcpy( buffer + n - 4, "-dec", 4 );
memcpy( buffer2 + n - 4, "-bad", 4 );
memcpy( buffer + n, argv[optind] + n - 4, 5 );
memcpy( buffer2 + n, argv[optind] + n - 4, 5 );
}
else
{
if( n > 5 && ( n + 6 < (int) sizeof( buffer ) ) &&
argv[optind][n - 5] == '.' )
{
memcpy( buffer , argv[optind], n - 5 );
memcpy( buffer2, argv[optind], n - 5 );
memcpy( buffer + n - 5, "-dec", 4 );
memcpy( buffer2 + n - 5, "-bad", 4 );
memcpy( buffer + n - 1, argv[optind] + n - 5, 6 );
memcpy( buffer2 + n - 1, argv[optind] + n - 5, 6 );
}
else
{
memset( buffer , 0, sizeof( buffer ) );
memset( buffer2, 0, sizeof( buffer ) );
snprintf( (char *) buffer , sizeof( buffer ) - 1,
"%s-dec", argv[optind] );
snprintf( (char *) buffer2, sizeof( buffer ) - 1,
"%s-bad", argv[optind] );
}
}
if( opt.crypt == CRYPT_WEP && opt.no_convert == 1 )
{
opt.store_bad=1;
}
/* Support manually-configured output files*/
char output[65536];
if ( opt.decrypted_fpath[0])
strncpy(output, opt.decrypted_fpath, 65536);
else
strncpy(output, (char*)buffer, 65536);
f_out = pcap_open_live(output, 65535, 1, 1, errbuf);
if( f_out == NULL )
{
perror( "pcap_open failed" );
printf( "Could not create \"%s\".\n", buffer );
return( 1 );
}
/* loop reading and deciphering the packets */
memset( &stats, 0, sizeof( stats ) );
tt = time( NULL );
st_1st = NULL;
while( 1 )
{
if( time( NULL ) - tt > 0 )
{
/* update the status line every second */
printf( "\33[KRead %ld packets...\r", stats.nb_read );
fflush( stdout );
tt = time( NULL );
}
/* read one packet */
struct pcap_pkthdr *_pkh;
const u_char *buffer;
int res = pcap_next_ex(f_in, &_pkh, &buffer);
bool end = false;
switch (res) {
case 0: continue;
case -1:
printf("pcap_next_ex return -1\n");
pcap_close(f_in);
sleep(1);
if ((f_in = pcap_open_live(argv[optind], 65535, 1, 1, errbuf)) == NULL)
{
perror( "pcap_open failed\n" );
printf( "Could not open \"%s\".\n", argv[optind] );
end = true;
break;
}
continue;
case -2:
printf("pcap_next_ex return -2\n");
end = true;
break;
}
if (end) break;
pkh = *_pkh;
n = pkh.caplen;
stats.nb_read++;
h80211 = (unsigned char*)buffer;
if( linktype == LINKTYPE_PRISM_HEADER )
{
/* remove the prism header */
if( h80211[7] == 0x40 )
n = 64; /* prism54 */
else
{
n = *(int *)( h80211 + 4 );
if( magic == TCPDUMP_CIGAM )
SWAP32( n );
}
if( n < 8 || n >= (int) pkh.caplen )
continue;
h80211 += n; pkh.caplen -= n;
}
if( linktype == LINKTYPE_RADIOTAP_HDR )
{
/* remove the radiotap header */
n = *(unsigned short *)( h80211 + 2 );
if( n <= 0 || n >= (int) pkh.caplen )
continue;
h80211 += n; pkh.caplen -= n;
}
if( linktype == LINKTYPE_PPI_HDR )
{
/* Remove the PPI header */
n = le16_to_cpu(*(unsigned short *)( h80211 + 2));
if( n <= 0 || n>= (int) pkh.caplen )
continue;
/* for a while Kismet logged broken PPI headers */
if ( n == 24 && le16_to_cpu(*(unsigned short *)(h80211 + 8)) == 2 )
n = 32;
if( n <= 0 || n>= (int) pkh.caplen )
continue;
h80211 += n; pkh.caplen -= n;
}
/* remove the FCS if present (madwifi) */
if( check_crc_buf( h80211, pkh.caplen - 4 ) == 1 )
{
pkh.len -= 4;
pkh.caplen -= 4;
}
/* check if data */
if( ( h80211[0] & 0x0C ) != 0x08 )
continue;
/* check minimum size */
z = ( ( h80211[1] & 3 ) != 3 ) ? 24 : 30;
if( z + 16 > pkh.caplen )
continue;
/* check QoS header */
if ( GET_SUBTYPE(h80211[0]) == IEEE80211_FC0_SUBTYPE_QOS ) {
z += 2;
}
/* check the BSSID */
switch( h80211[1] & 3 )
{
case 0: memcpy( bssid, h80211 + 16, 6 ); break; //Adhoc
case 1: memcpy( bssid, h80211 + 4, 6 ); break; //ToDS
case 2: memcpy( bssid, h80211 + 10, 6 ); break; //FromDS
case 3: memcpy( bssid, h80211 + 10, 6 ); break; //WDS -> Transmitter taken as BSSID
}
if( memcmp( opt.bssid, ZERO, 6 ) != 0 )
if( memcmp( opt.bssid, bssid, 6 ) != 0 )
continue;
/* locate the station's MAC address */
switch( h80211[1] & 3 )
{
case 1: memcpy( stmac, h80211 + 10, 6 ); break;
case 2: memcpy( stmac, h80211 + 4, 6 ); break;
case 3: memcpy( stmac, h80211 + 10, 6 ); break;
default: continue;
}
st_prv = NULL;
st_cur = st_1st;
while( st_cur != NULL )
{
if( ! memcmp( st_cur->stmac, stmac, 6 ) )
break;
st_prv = st_cur;
st_cur = st_cur->next;
}
/* if it's a new station, add it */
if( st_cur == NULL )
{
if( ! ( st_cur = (struct WPA_ST_info *) malloc(
sizeof( struct WPA_ST_info ) ) ) )
{
perror( "malloc failed" );
break;
}
memset( st_cur, 0, sizeof( struct WPA_ST_info ) );
if( st_1st == NULL )
st_1st = st_cur;
else
st_prv->next = st_cur;
memcpy( st_cur->stmac, stmac, 6 );
memcpy( st_cur->bssid, bssid, 6 );
}
/* check if we haven't already processed this packet */
crc = calc_crc_buf( h80211 + z, pkh.caplen - z );
if( ( h80211[1] & 3 ) == 2 )
{
if( st_cur->t_crc == crc )
continue;
st_cur->t_crc = crc;
}
else
{
if( st_cur->f_crc == crc )
continue;
st_cur->f_crc = crc;
}
/* check the SNAP header to see if data is encrypted *
* as unencrypted data begins with AA AA 03 00 00 00 */
if( h80211[z] != h80211[z + 1] || h80211[z + 2] != 0x03 )
{
/* check the extended IV flag */
if( ( h80211[z + 3] & 0x20 ) == 0 )
{
unsigned char K[64];
stats.nb_wep++;
if( opt.crypt != CRYPT_WEP )
continue;
memcpy( K, h80211 + z, 3 );
memcpy( K + 3, opt.wepkey, opt.weplen );
if(opt.store_bad)
memcpy(buffer2, h80211, pkh.caplen);
if( decrypt_wep( h80211 + z + 4, pkh.caplen - z - 4,
K, 3 + opt.weplen ) == 0 )
{
if(opt.store_bad)
{
stats.nb_bad++;
memcpy(h80211, buffer2, pkh.caplen);
//if( write_packet( f_bad, &pkh, h80211 ) != 0 ) // gilgil temp
// break;
}
continue;
}
/* WEP data packet was successfully decrypted, *
* remove the WEP IV & ICV and write the data */
pkh.len -= 8;
pkh.caplen -= 8;
memmove( h80211 + z, h80211 + z + 4, pkh.caplen - z );
stats.nb_unwep++;
h80211[1] &= 0xBF;
if( write_packet( f_out, &pkh, h80211 ) != 0 )
break;
}
else
{
stats.nb_wpa++;
if( opt.crypt != CRYPT_WPA )
continue;
/* if the PTK is valid, try to decrypt */
if( st_cur == NULL || ! st_cur->valid_ptk )
continue;
if( st_cur->keyver == 1 )
{
if( decrypt_tkip( h80211, pkh.caplen,
st_cur->ptk + 32 ) == 0 )
continue;
pkh.len -= 20;
pkh.caplen -= 20;
}
else
{
if( decrypt_ccmp( h80211, pkh.caplen,
st_cur->ptk + 32 ) == 0 )
continue;
pkh.len -= 16;
pkh.caplen -= 16;
}
/* WPA data packet was successfully decrypted, *
* remove the WPA Ext.IV & MIC, write the data */
/* can overlap */
memmove( h80211 + z, h80211 + z + 8, pkh.caplen - z );
stats.nb_unwpa++;
h80211[1] &= 0xBF;
if( write_packet( f_out, &pkh, h80211 ) != 0 )
break;
}
}
else
{
/* check ethertype == EAPOL */
z += 6;
if( h80211[z] != 0x88 || h80211[z + 1] != 0x8E )
{
stats.nb_plain++;
// if( opt.crypt != CRYPT_NONE )
// continue;
if( write_packet( f_out, &pkh, h80211 ) != 0 )
break;
else
continue;
}
z += 2;
/* type == 3 (key), desc. == 254 (WPA) or 2 (RSN) */
if( h80211[z + 1] != 0x03 ||
( h80211[z + 4] != 0xFE && h80211[z + 4] != 0x02 ) )
continue;
/* frame 1: Pairwise == 1, Install == 0, Ack == 1, MIC == 0 */
if( ( h80211[z + 6] & 0x08 ) != 0 &&
( h80211[z + 6] & 0x40 ) == 0 &&
( h80211[z + 6] & 0x80 ) != 0 &&
( h80211[z + 5] & 0x01 ) == 0 )
{
/* set authenticator nonce */
memcpy( st_cur->anonce, &h80211[z + 17], 32 );
}
/* frame 2 or 4: Pairwise == 1, Install == 0, Ack == 0, MIC == 1 */
if( ( h80211[z + 6] & 0x08 ) != 0 &&
( h80211[z + 6] & 0x40 ) == 0 &&
( h80211[z + 6] & 0x80 ) == 0 &&
( h80211[z + 5] & 0x01 ) != 0 )
{
if( memcmp( &h80211[z + 17], ZERO, 32 ) != 0 )
{
/* set supplicant nonce */
memcpy( st_cur->snonce, &h80211[z + 17], 32 );
}
/* copy the MIC & eapol frame */
st_cur->eapol_size = ( h80211[z + 2] << 8 )
+ h80211[z + 3] + 4;
if (pkh.len - z < st_cur->eapol_size || st_cur->eapol_size == 0 ||
st_cur->eapol_size > sizeof(st_cur->eapol))
{
// Ignore the packet trying to crash us.
st_cur->eapol_size = 0;
continue;
}
memcpy( st_cur->keymic, &h80211[z + 81], 16 );
memcpy( st_cur->eapol, &h80211[z], st_cur->eapol_size );
memset( st_cur->eapol + 81, 0, 16 );
/* copy the key descriptor version */
st_cur->keyver = h80211[z + 6] & 7;
}
/* frame 3: Pairwise == 1, Install == 1, Ack == 1, MIC == 1 */
if( ( h80211[z + 6] & 0x08 ) != 0 &&
( h80211[z + 6] & 0x40 ) != 0 &&
( h80211[z + 6] & 0x80 ) != 0 &&
( h80211[z + 5] & 0x01 ) != 0 )
{
if( memcmp( &h80211[z + 17], ZERO, 32 ) != 0 )
{
/* set authenticator nonce */
memcpy( st_cur->anonce, &h80211[z + 17], 32 );
}
/* copy the MIC & eapol frame */
st_cur->eapol_size = ( h80211[z + 2] << 8 )
+ h80211[z + 3] + 4;
if (pkh.len - z < st_cur->eapol_size || st_cur->eapol_size == 0 ||
st_cur->eapol_size > sizeof(st_cur->eapol))
{
// Ignore the packet trying to crash us.
st_cur->eapol_size = 0;
continue;
}
memcpy( st_cur->keymic, &h80211[z + 81], 16 );
memcpy( st_cur->eapol, &h80211[z], st_cur->eapol_size );
memset( st_cur->eapol + 81, 0, 16 );
/* copy the key descriptor version */
st_cur->keyver = h80211[z + 6] & 7;
}
st_cur->valid_ptk = calc_ptk( st_cur, opt.pmk );
}
}
while (st_1st != NULL)
{
st_cur = st_1st->next;
free(st_1st);
st_1st = st_cur;
}
// pcap_close( f_in );
pcap_close( f_out );
if(opt.store_bad)
fclose( f_bad );
/* write some statistics */