//-----------------------------------------------------------------------------
// High frequency Legic commands
//-----------------------------------------------------------------------------
-
-#include <stdio.h>
-#include <string.h>
-#include "proxmark3.h"
-#include "data.h"
-#include "ui.h"
-#include "cmdparser.h"
#include "cmdhflegic.h"
-#include "cmdmain.h"
-#include "util.h"
-#include "crc.h"
+
static int CmdHelp(const char *Cmd);
int usage_legic_calccrc8(void){
- PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
+ 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 <hexbytes>");
- PrintAndLog("Options :");
- PrintAndLog(" <hexbytes> : hex bytes in a string");
+ 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("Sample : hf legic crc8 deadbeef1122");
+ 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(" sample: hf legic load filename");
+ 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
+ * This is based on information given in the talk held
* by Henryk Ploetz and Karsten Nohl at 26c3
*/
int CmdLegicDecode(const char *Cmd) {
int crc = 0;
int wrp = 0;
int wrc = 0;
- uint8_t data_buf[1200]; // receiver buffer, should be 1024..
- char token_type[4];
+ uint8_t data_buf[1052]; // receiver buffer, should be 1024..
+ char token_type[5];
+ int dcf;
+ int bIsSegmented = 0;
- // copy data from proxmark into buffer
- GetFromBigBuf(data_buf, sizeof(data_buf), 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;
(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));
- break;
- default:
- strncpy(token_type, "???",sizeof(token_type));
+ fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
break;
}
stamp_len = 0xfc - data_buf[6];
+ }
- PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
+ 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
+ stamp_len,
+ fl
);
- PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
+ } 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[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;
- // see if user area is xored or just zeros.
- int numOfZeros = 0;
- for (int index=22; index < 256; ++index){
- if ( data_buf[index] == 0x00 )
- ++numOfZeros;
- }
- // if possible zeros is less then 60%, lets assume data is xored
- // 256 - 22 (header) = 234
- // 1024 - 22 (header) = 1002
- int isXored = (numOfZeros*100/stamp_len) < 50;
- PrintAndLog("is data xored? %d ( %d %)", isXored, (numOfZeros*100/stamp_len));
- print_hex_break( data_buf, 33, 16);
+ // Data card?
+ if(dcf <= 60000) {
PrintAndLog("\nADF: User Area");
PrintAndLog("------------------------------------------------------");
+
+ if(bIsSegmented) {
+
+ // Data start point on segmented cards
i = 22;
- // 64 potential segements
- // how to detect there is no segments?!?
- for ( segmentNum=0; segmentNum<64; segmentNum++ ) {
+
+ // 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;
PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
- // de-xor? if not zero, assume it needs xoring.
- if ( isXored) {
- for ( k=i; k < wrc; ++k)
+
+ for ( k=i; k < (i+wrc); ++k)
data_buf[k] ^= crc;
- }
+
print_hex_break( data_buf+i, wrc, 16);
i += wrc;
PrintAndLog("\nrow | data");
PrintAndLog("-----+------------------------------------------------");
- if (isXored) {
- for (k=i; k < wrp_len; ++k)
+ 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?
+ // 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("-----+------------------------------------------------");
- if ( isXored ) {
- for ( k=i; k < remain_seg_payload_len; ++k)
+
+ 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);
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;
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};
+ 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");
int i;
UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
- for(i = 0; i < 48; i++) {
- c.d.asBytes[i] = cmd.arg[2];
- }
-
+ 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);
+ WaitForResponse(CMD_ACK, NULL);
}
clearCommandBuffer();
SendCommand(&cmd);
int CmdLegicCalcCrc8(const char *Cmd){
- int len = strlen(Cmd);
- if ( len & 1 ) return usage_legic_calccrc8();
+ uint8_t *data = NULL;
+ uint8_t cmdp = 0, uidcrc = 0, type=0;
+ bool errors = false;
+ int len = 0;
+ int bg, en;
- // add 1 for null terminator.
- uint8_t *data = malloc(len+1);
- if ( data == NULL ) return 1;
-
- if (param_gethex(Cmd, 0, data, len )) {
- free(data);
- return usage_legic_calccrc8();
+ 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;
}
- uint32_t checksum = CRC8Legic(data, len/2);
- PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
- free(data);
+ if (data) free(data);
return 0;
}
{"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}
projects / proxmark3-svn / blobdiff