mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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486 lines
13 KiB
C
486 lines
13 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// High frequency Legic commands
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//-----------------------------------------------------------------------------
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#include <stdio.h>
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#include <string.h>
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#include "proxmark3.h"
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#include "data.h"
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#include "ui.h"
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#include "cmdparser.h"
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#include "cmdhflegic.h"
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#include "cmdmain.h"
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#include "util.h"
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#include "crc.h"
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static int CmdHelp(const char *Cmd);
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int usage_legic_calccrc8(void){
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PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
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PrintAndLog("There must be an even number of hexsymbols as input.");
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PrintAndLog("Usage: hf legic crc8 <hexbytes>");
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PrintAndLog("Options :");
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PrintAndLog(" <hexbytes> : hex bytes in a string");
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PrintAndLog("");
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PrintAndLog("Sample : hf legic crc8 deadbeef1122");
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return 0;
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}
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int usage_legic_load(void){
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PrintAndLog("It loads datasamples from the file `filename` to device memory");
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PrintAndLog("Usage: hf legic load <file name>");
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PrintAndLog(" sample: hf legic load filename");
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return 0;
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}
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int usage_legic_read(void){
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PrintAndLog("Read data from a legic tag.");
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PrintAndLog("Usage: hf legic read <offset> <num of bytes>");
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PrintAndLog("Options :");
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PrintAndLog(" <offset> : offset in data array to start download from");
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PrintAndLog(" <num of bytes> : number of bytes to download");
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PrintAndLog("");
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PrintAndLog(" sample: hf legic read");
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return 0;
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}
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/*
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* Output BigBuf and deobfuscate LEGIC RF tag data.
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* This is based on information given in the talk held
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* by Henryk Ploetz and Karsten Nohl at 26c3
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*/
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int CmdLegicDecode(const char *Cmd) {
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// Index for the bytearray.
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int i = 0;
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int k = 0, segmentNum;
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int segment_len = 0;
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int segment_flag = 0;
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uint8_t stamp_len = 0;
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int crc = 0;
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int wrp = 0;
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int wrc = 0;
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uint8_t data_buf[1024]; // receiver buffer, should be 1024..
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char token_type[4];
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// download EML memory, where the "legic read" command puts the data.
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GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
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if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
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PrintAndLog("Command execute timeout");
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return 1;
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}
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// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
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crc = data_buf[4];
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uint32_t calc_crc = CRC8Legic(data_buf, 4);
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PrintAndLog("\nCDF: System Area");
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PrintAndLog("------------------------------------------------------");
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PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
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data_buf[0],
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data_buf[1],
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data_buf[2],
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data_buf[3],
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data_buf[4],
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(calc_crc == crc) ? "OK":"Fail"
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);
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switch (data_buf[5] & 0x7f) {
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case 0x00 ... 0x2f:
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strncpy(token_type, "IAM",sizeof(token_type));
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break;
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case 0x30 ... 0x6f:
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strncpy(token_type, "SAM",sizeof(token_type));
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break;
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case 0x70 ... 0x7f:
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strncpy(token_type, "GAM",sizeof(token_type));
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break;
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default:
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strncpy(token_type, "???",sizeof(token_type));
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break;
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}
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stamp_len = 0xfc - data_buf[6];
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PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
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data_buf[5],
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data_buf[6],
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token_type,
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(data_buf[5]&0x80)>>7,
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stamp_len
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);
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PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
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data_buf[7]&0x0f,
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(data_buf[7]&0x70)>>4,
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(data_buf[7]&0x80)>>7,
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data_buf[7],
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data_buf[8]
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);
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PrintAndLog("Remaining Header Area");
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PrintAndLog("%s", sprint_hex(data_buf+9, 13));
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uint8_t segCrcBytes[8] = {0x00};
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uint32_t segCalcCRC = 0;
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uint32_t segCRC = 0;
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// see if user area is xored or just zeros.
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int numOfZeros = 0;
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for (int index=22; index < 256; ++index){
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if ( data_buf[index] == 0x00 )
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++numOfZeros;
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}
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// if possible zeros is less then 60%, lets assume data is xored
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// 256 - 22 (header) = 234
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// 1024 - 22 (header) = 1002
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int isXored = (numOfZeros*100/stamp_len) < 50;
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PrintAndLog("is data xored? %d ( %d %)", isXored, (numOfZeros*100/stamp_len));
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print_hex_break( data_buf, 33, 16);
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return 0;
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PrintAndLog("\nADF: User Area");
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PrintAndLog("------------------------------------------------------");
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i = 22;
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// 64 potential segements
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// how to detect there is no segments?!?
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for ( segmentNum=0; segmentNum<64; segmentNum++ ) {
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segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
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segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
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wrp = (data_buf[i+2]^crc);
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wrc = ((data_buf[i+3]^crc)&0x70)>>4;
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bool hasWRC = (wrc > 0);
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bool hasWRP = (wrp > wrc);
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int wrp_len = (wrp - wrc);
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int remain_seg_payload_len = (segment_len - wrp - 5);
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// validate segment-crc
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segCrcBytes[0]=data_buf[0]; //uid0
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segCrcBytes[1]=data_buf[1]; //uid1
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segCrcBytes[2]=data_buf[2]; //uid2
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segCrcBytes[3]=data_buf[3]; //uid3
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segCrcBytes[4]=(data_buf[i]^crc); //hdr0
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segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
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segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
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segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
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segCalcCRC = CRC8Legic(segCrcBytes, 8);
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segCRC = data_buf[i+4]^crc;
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PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
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segmentNum,
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data_buf[i]^crc,
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data_buf[i+1]^crc,
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data_buf[i+2]^crc,
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data_buf[i+3]^crc,
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segment_len,
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segment_flag,
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(segment_flag & 0x4) >> 2,
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(segment_flag & 0x8) >> 3,
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wrp,
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wrc,
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((data_buf[i+3]^crc) & 0x80) >> 7,
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segCRC,
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( segCRC == segCalcCRC ) ? "OK" : "fail"
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);
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i += 5;
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if ( hasWRC ) {
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PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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// de-xor? if not zero, assume it needs xoring.
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if ( isXored) {
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for ( k=i; k < wrc; ++k)
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data_buf[k] ^= crc;
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}
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print_hex_break( data_buf+i, wrc, 16);
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i += wrc;
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}
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if ( hasWRP ) {
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PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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if (isXored) {
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for (k=i; k < wrp_len; ++k)
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data_buf[k] ^= crc;
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}
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print_hex_break( data_buf+i, wrp_len, 16);
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i += wrp_len;
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// does this one work?
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if( wrp_len == 8 )
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PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
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}
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PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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if ( isXored ) {
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for ( k=i; k < remain_seg_payload_len; ++k)
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data_buf[k] ^= crc;
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}
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print_hex_break( data_buf+i, remain_seg_payload_len, 16);
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i += remain_seg_payload_len;
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PrintAndLog("-----+------------------------------------------------\n");
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// end with last segment
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if (segment_flag & 0x8) return 0;
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} // end for loop
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return 0;
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}
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int CmdLegicRFRead(const char *Cmd) {
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// params:
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// offset in data
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// number of bytes.
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char cmdp = param_getchar(Cmd, 0);
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if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
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int byte_count=0, offset=0;
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sscanf(Cmd, "%i %i", &offset, &byte_count);
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if(byte_count == 0) byte_count = -1;
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if(byte_count + offset > 1024) byte_count = 1024 - offset;
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UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
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clearCommandBuffer();
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SendCommand(&c);
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return 0;
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}
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int CmdLegicLoad(const char *Cmd) {
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char cmdp = param_getchar(Cmd, 0);
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if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
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char filename[FILE_PATH_SIZE] = {0x00};
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int len = strlen(Cmd);
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if (len > FILE_PATH_SIZE) {
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PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
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return 0;
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}
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memcpy(filename, Cmd, len);
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FILE *f = fopen(filename, "r");
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if(!f) {
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PrintAndLog("couldn't open '%s'", Cmd);
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return -1;
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}
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char line[80];
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int offset = 0;
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uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
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int index = 0;
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int totalbytes = 0;
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while ( fgets(line, sizeof(line), f) ) {
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int res = sscanf(line, "%x %x %x %x %x %x %x %x",
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(unsigned int *)&data[index],
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(unsigned int *)&data[index + 1],
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(unsigned int *)&data[index + 2],
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(unsigned int *)&data[index + 3],
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(unsigned int *)&data[index + 4],
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(unsigned int *)&data[index + 5],
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(unsigned int *)&data[index + 6],
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(unsigned int *)&data[index + 7]);
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if(res != 8) {
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PrintAndLog("Error: could not read samples");
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fclose(f);
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return -1;
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}
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index += res;
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if ( index == USB_CMD_DATA_SIZE ){
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// PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
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UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
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memcpy(c.d.asBytes, data, sizeof(data));
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clearCommandBuffer();
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SendCommand(&c);
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if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
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PrintAndLog("Command execute timeout");
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fclose(f);
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return 1;
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}
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offset += index;
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totalbytes += index;
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index = 0;
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}
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}
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fclose(f);
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// left over bytes?
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if ( index != 0 ) {
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UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
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memcpy(c.d.asBytes, data, 8);
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clearCommandBuffer();
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SendCommand(&c);
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if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
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PrintAndLog("Command execute timeout");
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return 1;
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}
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totalbytes += index;
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}
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PrintAndLog("loaded %u samples", totalbytes);
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return 0;
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}
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int CmdLegicSave(const char *Cmd) {
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int requested = 1024;
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int offset = 0;
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int delivered = 0;
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char filename[FILE_PATH_SIZE];
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uint8_t got[1024] = {0x00};
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sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
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/* If no length given save entire legic read buffer */
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/* round up to nearest 8 bytes so the saved data can be used with legicload */
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if (requested == 0)
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requested = 1024;
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if (requested % 8 != 0) {
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int remainder = requested % 8;
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requested = requested + 8 - remainder;
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}
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if (offset + requested > sizeof(got)) {
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PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
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return 0;
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}
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GetFromBigBuf(got, requested, offset);
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if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
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PrintAndLog("Command execute timeout");
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return 1;
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}
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FILE *f = fopen(filename, "w");
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if(!f) {
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PrintAndLog("couldn't open '%s'", Cmd+1);
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return -1;
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}
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for (int j = 0; j < requested; j += 8) {
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fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
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got[j+0], got[j+1], got[j+2], got[j+3],
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got[j+4], got[j+5], got[j+6], got[j+7]
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);
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delivered += 8;
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if (delivered >= requested) break;
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}
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fclose(f);
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PrintAndLog("saved %u samples", delivered);
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return 0;
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}
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//TODO: write a help text (iceman)
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int CmdLegicRfSim(const char *Cmd) {
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UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
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sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
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clearCommandBuffer();
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SendCommand(&c);
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return 0;
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}
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//TODO: write a help text (iceman)
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int CmdLegicRfWrite(const char *Cmd) {
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UsbCommand c = {CMD_WRITER_LEGIC_RF};
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int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
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if(res != 2) {
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PrintAndLog("Please specify the offset and length as two hex strings");
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return -1;
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}
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clearCommandBuffer();
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SendCommand(&c);
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return 0;
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}
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int CmdLegicRfFill(const char *Cmd) {
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UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
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int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
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if(res != 3) {
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PrintAndLog("Please specify the offset, length and value as two hex strings");
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return -1;
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}
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int i;
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UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
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for(i = 0; i < 48; i++) {
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c.d.asBytes[i] = cmd.arg[2];
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}
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for(i = 0; i < 22; i++) {
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c.arg[0] = i*48;
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SendCommand(&c);
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WaitForResponse(CMD_ACK,NULL);
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}
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clearCommandBuffer();
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SendCommand(&cmd);
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return 0;
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}
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int CmdLegicCalcCrc8(const char *Cmd){
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int len = strlen(Cmd);
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if ( len & 1 ) return usage_legic_calccrc8();
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// add 1 for null terminator.
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uint8_t *data = malloc(len+1);
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if ( data == NULL ) return 1;
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if (param_gethex(Cmd, 0, data, len )) {
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free(data);
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return usage_legic_calccrc8();
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}
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uint32_t checksum = CRC8Legic(data, len/2);
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PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
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free(data);
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return 0;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, 1, "This help"},
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{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
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{"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
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{"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
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{"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
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{"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
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{"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
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{"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
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{"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
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{NULL, NULL, 0, NULL}
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};
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|
int CmdHFLegic(const char *Cmd) {
|
|
clearCommandBuffer();
|
|
CmdsParse(CommandTable, Cmd);
|
|
return 0;
|
|
}
|
|
|
|
int CmdHelp(const char *Cmd) {
|
|
CmdsHelp(CommandTable);
|
|
return 0;
|
|
} |