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proxmark3/client/cmdhflegic.c

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//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// High frequency Legic commands
//-----------------------------------------------------------------------------
#include "cmdhflegic.h"
static int CmdHelp(const char *Cmd);
int usage_legic_calccrc8(void){
PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
PrintAndLog("There must be an even number of hexsymbols as input.");
PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
PrintAndLog("Options:");
PrintAndLog(" b <hexbytes> : hex bytes");
PrintAndLog(" u <uidcrc> : MCC hexbyte");
PrintAndLog(" c <crc type> : 8|16 bit crc size");
PrintAndLog("");
PrintAndLog("Samples:");
PrintAndLog(" hf legic crc8 b deadbeef1122");
PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A c 16");
return 0;
}
int usage_legic_load(void){
PrintAndLog("It loads datasamples from the file `filename` to device memory");
PrintAndLog("Usage: hf legic load <file name>");
PrintAndLog("");
PrintAndLog("Samples:");
PrintAndLog(" hf legic load filename");
return 0;
}
int usage_legic_read(void){
PrintAndLog("Read data from a legic tag.");
PrintAndLog("Usage: hf legic read <offset> <num of bytes>");
PrintAndLog("Options:");
PrintAndLog(" <offset> : offset in data array to start download from");
PrintAndLog(" <num of bytes> : number of bytes to download");
PrintAndLog("");
PrintAndLog("Samples:");
PrintAndLog(" hf legic read");
return 0;
}
/*
* Output BigBuf and deobfuscate LEGIC RF tag data.
* This is based on information given in the talk held
* by Henryk Ploetz and Karsten Nohl at 26c3
*/
int CmdLegicDecode(const char *Cmd) {
// Index for the bytearray.
int i = 0;
int k = 0, segmentNum;
int segment_len = 0;
int segment_flag = 0;
uint8_t stamp_len = 0;
int crc = 0;
int wrp = 0;
int wrc = 0;
uint8_t data_buf[1052]; // receiver buffer, should be 1024..
char token_type[5];
int dcf;
int bIsSegmented = 0;
// download EML memory, where the "legic read" command puts the data.
GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
PrintAndLog("Command execute timeout");
return 1;
}
// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
crc = data_buf[4];
uint32_t calc_crc = CRC8Legic(data_buf, 4);
PrintAndLog("\nCDF: System Area");
PrintAndLog("------------------------------------------------------");
PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
data_buf[0],
data_buf[1],
data_buf[2],
data_buf[3],
data_buf[4],
(calc_crc == crc) ? "OK":"Fail"
);
token_type[0] = 0;
dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
// New unwritten media?
if(dcf == 0xFFFF) {
PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
dcf,
data_buf[5],
data_buf[6]
);
} else if(dcf > 60000) { // Master token?
int fl = 0;
if(data_buf[6] == 0xec) {
strncpy(token_type, "XAM", sizeof(token_type));
fl = 1;
stamp_len = 0x0c - (data_buf[5] >> 4);
} else {
switch (data_buf[5] & 0x7f) {
case 0x00 ... 0x2f:
strncpy(token_type, "IAM",sizeof(token_type));
fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
break;
case 0x30 ... 0x6f:
strncpy(token_type, "SAM",sizeof(token_type));
fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
break;
case 0x70 ... 0x7f:
strncpy(token_type, "GAM",sizeof(token_type));
fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
break;
}
stamp_len = 0xfc - data_buf[6];
}
PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
dcf,
data_buf[5],
data_buf[6],
token_type,
(data_buf[5]&0x80)>>7,
stamp_len,
fl
);
} else { // Is IM(-S) type of card...
if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
bIsSegmented = 1;
strncpy(token_type, "IM-S", sizeof(token_type));
} else {
strncpy(token_type, "IM", sizeof(token_type));
}
PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
dcf,
data_buf[5],
data_buf[6],
token_type,
(data_buf[5]&0x80)>>7
);
}
// Makes no sence to show this on blank media...
if(dcf != 0xFFFF) {
if(bIsSegmented) {
PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
data_buf[7]&0x0f,
(data_buf[7]&0x70)>>4,
(data_buf[7]&0x80)>>7,
data_buf[8]
);
}
// Header area is only available on IM-S cards, on master tokens this data is the master token data itself
if(bIsSegmented || dcf > 60000) {
if(dcf > 60000) {
PrintAndLog("Master token data");
PrintAndLog("%s", sprint_hex(data_buf+8, 14));
} else {
PrintAndLog("Remaining Header Area");
PrintAndLog("%s", sprint_hex(data_buf+9, 13));
}
}
}
uint8_t segCrcBytes[8] = {0x00};
uint32_t segCalcCRC = 0;
uint32_t segCRC = 0;
// Data card?
if(dcf <= 60000) {
PrintAndLog("\nADF: User Area");
PrintAndLog("------------------------------------------------------");
if(bIsSegmented) {
// Data start point on segmented cards
i = 22;
// decode segments
for (segmentNum=1; segmentNum < 128; segmentNum++ )
{
segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
wrp = (data_buf[i+2]^crc);
wrc = ((data_buf[i+3]^crc)&0x70)>>4;
bool hasWRC = (wrc > 0);
bool hasWRP = (wrp > wrc);
int wrp_len = (wrp - wrc);
int remain_seg_payload_len = (segment_len - wrp - 5);
// validate segment-crc
segCrcBytes[0]=data_buf[0]; //uid0
segCrcBytes[1]=data_buf[1]; //uid1
segCrcBytes[2]=data_buf[2]; //uid2
segCrcBytes[3]=data_buf[3]; //uid3
segCrcBytes[4]=(data_buf[i]^crc); //hdr0
segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
segCalcCRC = CRC8Legic(segCrcBytes, 8);
segCRC = data_buf[i+4]^crc;
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)",
segmentNum,
data_buf[i]^crc,
data_buf[i+1]^crc,
data_buf[i+2]^crc,
data_buf[i+3]^crc,
segment_len,
segment_flag,
(segment_flag & 0x4) >> 2,
(segment_flag & 0x8) >> 3,
wrp,
wrc,
((data_buf[i+3]^crc) & 0x80) >> 7,
segCRC,
( segCRC == segCalcCRC ) ? "OK" : "fail"
);
i += 5;
if ( hasWRC ) {
PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
for ( k=i; k < (i+wrc); ++k)
data_buf[k] ^= crc;
print_hex_break( data_buf+i, wrc, 16);
i += wrc;
}
if ( hasWRP ) {
PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
for (k=i; k < (i+wrp_len); ++k)
data_buf[k] ^= crc;
print_hex_break( data_buf+i, wrp_len, 16);
i += wrp_len;
// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
if( wrp_len == 8 )
PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
}
PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
for ( k=i; k < (i+remain_seg_payload_len); ++k)
data_buf[k] ^= crc;
print_hex_break( data_buf+i, remain_seg_payload_len, 16);
i += remain_seg_payload_len;
PrintAndLog("-----+------------------------------------------------\n");
// end with last segment
if (segment_flag & 0x8) return 0;
} // end for loop
} else {
// Data start point on unsegmented cards
i = 8;
wrp = data_buf[7] & 0x0F;
wrc = (data_buf[7] & 0x07) >> 4;
bool hasWRC = (wrc > 0);
bool hasWRP = (wrp > wrc);
int wrp_len = (wrp - wrc);
int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
wrp,
wrc,
(data_buf[7] & 0x80) >> 7
);
if ( hasWRC ) {
PrintAndLog("WRC protected area: (I %d | WRC %d)", i, wrc);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
print_hex_break( data_buf+i, wrc, 16);
i += wrc;
}
if ( hasWRP ) {
PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
print_hex_break( data_buf+i, wrp_len, 16);
i += wrp_len;
// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
if( wrp_len == 8 )
PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
}
PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
print_hex_break( data_buf+i, remain_seg_payload_len, 16);
i += remain_seg_payload_len;
PrintAndLog("-----+------------------------------------------------\n");
}
}
return 0;
}
int CmdLegicRFRead(const char *Cmd) {
// params:
// offset in data
// number of bytes.
char cmdp = param_getchar(Cmd, 0);
if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
int byte_count=0, offset=0;
sscanf(Cmd, "%i %i", &offset, &byte_count);
if(byte_count == 0) byte_count = -1;
if(byte_count + offset > 1024) byte_count = 1024 - offset;
UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
clearCommandBuffer();
SendCommand(&c);
return 0;
}
int CmdLegicLoad(const char *Cmd) {
char cmdp = param_getchar(Cmd, 0);
if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
char filename[FILE_PATH_SIZE] = {0x00};
int len = strlen(Cmd);
if (len > FILE_PATH_SIZE) {
PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
return 0;
}
memcpy(filename, Cmd, len);
FILE *f = fopen(filename, "r");
if(!f) {
PrintAndLog("couldn't open '%s'", Cmd);
return -1;
}
char line[80];
int offset = 0;
uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
int index = 0;
int totalbytes = 0;
while ( fgets(line, sizeof(line), f) ) {
int res = sscanf(line, "%x %x %x %x %x %x %x %x",
(unsigned int *)&data[index],
(unsigned int *)&data[index + 1],
(unsigned int *)&data[index + 2],
(unsigned int *)&data[index + 3],
(unsigned int *)&data[index + 4],
(unsigned int *)&data[index + 5],
(unsigned int *)&data[index + 6],
(unsigned int *)&data[index + 7]);
if(res != 8) {
PrintAndLog("Error: could not read samples");
fclose(f);
return -1;
}
index += res;
if ( index == USB_CMD_DATA_SIZE ){
// PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
memcpy(c.d.asBytes, data, sizeof(data));
clearCommandBuffer();
SendCommand(&c);
if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
PrintAndLog("Command execute timeout");
fclose(f);
return 1;
}
offset += index;
totalbytes += index;
index = 0;
}
}
fclose(f);
// left over bytes?
if ( index != 0 ) {
UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
memcpy(c.d.asBytes, data, 8);
clearCommandBuffer();
SendCommand(&c);
if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
PrintAndLog("Command execute timeout");
return 1;
}
totalbytes += index;
}
PrintAndLog("loaded %u samples", totalbytes);
return 0;
}
int CmdLegicSave(const char *Cmd) {
int requested = 1024;
int offset = 0;
int delivered = 0;
char filename[FILE_PATH_SIZE];
uint8_t got[1024] = {0x00};
sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
/* If no length given save entire legic read buffer */
/* round up to nearest 8 bytes so the saved data can be used with legicload */
if (requested == 0)
requested = 1024;
if (requested % 8 != 0) {
int remainder = requested % 8;
requested = requested + 8 - remainder;
}
if (offset + requested > sizeof(got)) {
PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
return 0;
}
GetFromBigBuf(got, requested, offset);
if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
PrintAndLog("Command execute timeout");
return 1;
}
FILE *f = fopen(filename, "w");
if(!f) {
PrintAndLog("couldn't open '%s'", Cmd+1);
return -1;
}
for (int j = 0; j < requested; j += 8) {
fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
got[j+0], got[j+1], got[j+2], got[j+3],
got[j+4], got[j+5], got[j+6], got[j+7]
);
delivered += 8;
if (delivered >= requested) break;
}
fclose(f);
PrintAndLog("saved %u samples", delivered);
return 0;
}
//TODO: write a help text (iceman)
int CmdLegicRfSim(const char *Cmd) {
UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
clearCommandBuffer();
SendCommand(&c);
return 0;
}
//TODO: write a help text (iceman)
int CmdLegicRfWrite(const char *Cmd) {
UsbCommand c = {CMD_WRITER_LEGIC_RF};
int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
if(res != 2) {
PrintAndLog("Please specify the offset and length as two hex strings");
return -1;
}
clearCommandBuffer();
SendCommand(&c);
return 0;
}
//TODO: write a help text (iceman)
int CmdLegicRfRawWrite(const char *Cmd) {
char answer;
UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
if(res != 2) {
PrintAndLog("Please specify the offset and value as two hex strings");
return -1;
}
if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
PrintAndLog("############# DANGER !! #############");
PrintAndLog("# changing the DCF is irreversible #");
PrintAndLog("#####################################");
PrintAndLog("do youe really want to continue? y(es) n(o)");
if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
SendCommand(&c);
return 0;
}
return -1;
}
clearCommandBuffer();
SendCommand(&c);
return 0;
}
//TODO: write a help text (iceman)
int CmdLegicRfFill(const char *Cmd) {
UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
if(res != 3) {
PrintAndLog("Please specify the offset, length and value as two hex strings");
return -1;
}
int i;
UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
memset(c.d.asBytes, cmd.arg[2], 48);
for(i = 0; i < 22; i++) {
c.arg[0] = i*48;
clearCommandBuffer();
SendCommand(&c);
WaitForResponse(CMD_ACK, NULL);
}
clearCommandBuffer();
SendCommand(&cmd);
return 0;
}
int CmdLegicCalcCrc8(const char *Cmd){
uint8_t *data = NULL;
uint8_t cmdp = 0, uidcrc = 0, type=0;
bool errors = false;
int len = 0;
int bg, en;
while(param_getchar(Cmd, cmdp) != 0x00) {
switch(param_getchar(Cmd, cmdp)) {
case 'b':
case 'B':
// peek at length of the input string so we can
// figure out how many elements to malloc in "data"
bg=en=0;
param_getptr(Cmd, &bg, &en, cmdp+1);
len = (en - bg + 1);
// check that user entered even number of characters
// for hex data string
if (len & 1) {
errors = true;
break;
}
// it's possible for user to accidentally enter "b" parameter
// more than once - we have to clean previous malloc
if (data) free(data);
data = malloc(len >> 1);
if ( data == NULL ) {
PrintAndLog("Can't allocate memory. exiting");
errors = true;
break;
}
param_gethex(Cmd, cmdp+1, data, len);
len >>= 1;
cmdp += 2;
break;
case 'u':
case 'U':
uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
cmdp += 2;
break;
case 'c':
case 'C':
type = param_get8ex(Cmd, cmdp+1, 0, 10);
cmdp += 2;
break;
case 'h':
case 'H':
errors = true;
break;
default:
PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
errors = true;
break;
}
if (errors) break;
}
//Validations
if (errors){
if (data) free(data);
return usage_legic_calccrc8();
}
switch (type){
case 16:
PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
break;
default:
PrintAndLog("LEGIC CRC8: %X", CRC8Legic(data, len) );
break;
}
if (data) free(data);
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
{"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
{"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
{"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
{"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
{"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
{"writeRaw",CmdLegicRfRawWrite, 0, "<address> <value> -- Write direct to address"},
{"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
{"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
{NULL, NULL, 0, NULL}
};
int CmdHFLegic(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}
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