git.zerfleddert.de Git - proxmark3-svn/blobdiff

+//-----------------------------------------------------------------------------

+//

+// 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 <stdio.h>

#include <string.h>

#include <stdio.h>

#include <string.h>

-#include "proxusb.h"

+#include <inttypes.h>

+#include "proxmark3.h"

+#include "data.h"

+#include "ui.h"

#include "cmdparser.h"

#include "cmdhflegic.h"

#include "cmdmain.h"

#include "cmdparser.h"

#include "cmdhflegic.h"

#include "cmdmain.h"

-#include "data.h"

-#include "ui.h"

-#include <string.h>

-#include <stdio.h>

-

+#include "util.h"

static int CmdHelp(const char *Cmd);

-int CmdLegicRFRead(const char *Cmd)

-{

- int byte_count=0,offset=0;

- sscanf(Cmd, "%i %i", &offset, &byte_count);

- if(byte_count == 0) byte_count = 256;

- if(byte_count + offset > 256) byte_count = 256 - offset;

- UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};

- SendCommand(&c);

- return 0;

-}

-

static command_t CommandTable[] =

{

{"help", CmdHelp, 1, "This help"},

static command_t CommandTable[] =

{

{"help", CmdHelp, 1, "This help"},

- {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},

{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},

+ {"reader", 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)"},

+ {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},

{NULL, NULL, 0, NULL}

};

{NULL, NULL, 0, NULL}

};

* 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

* 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

- * FIXME: will crash if sample buffer does not contain valid legic data

*/

int CmdLegicDecode(const char *Cmd)

{

*/

int CmdLegicDecode(const char *Cmd)

{

- int h, i, j, k, n;

+ int i, j, k, n;

int segment_len = 0;

int segment_flag = 0;

int stamp_len = 0;

int crc = 0;

int wrp = 0;

int wrc = 0;

int segment_len = 0;

int segment_flag = 0;

int stamp_len = 0;

int crc = 0;

int wrp = 0;

int wrc = 0;

- int data_buf[1032]; // receiver buffer

+ uint8_t data_buf[1052]; // receiver buffer

char out_string[3076]; // just use big buffer - bad practice

char token_type[4];

char out_string[3076]; // just use big buffer - bad practice

char token_type[4];

- int delivered = 0;

-

- h = 0;

// copy data from proxmark into buffer

- for (i = 0; i < 256; i += 12, h += 48) {

- UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};

- SendCommand(&c);

- WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);

-

- for (j = 0; j < 48; j += 8) {

- for (k = 0; k < 8; k++) {

- data_buf[h+j+k] = sample_buf[j+k];

- }

- delivered += 8;

- if (delivered >= 1024)

- break;

- }

+ GetFromBigBuf(data_buf,sizeof(data_buf),0);

+ WaitForResponse(CMD_ACK,NULL);

// Output CDF System area (9 bytes) plus remaining header area (12 bytes)

PrintAndLog("\nADF: User Area");

- i = 22;

+ i = 22;

for (n=0; n<64; n++) {

segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);

segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;

for (n=0; n<64; n++) {

segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);

segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;

if (wrc>0) {

PrintAndLog("WRC protected area:");

if (wrc>0) {

PrintAndLog("WRC protected area:");

- for (k=0, j=0; k < wrc; k++, i++, j += 3) {

+ for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

if (wrp>wrc) {

PrintAndLog("Remaining write protected area:");

if (wrp>wrc) {

PrintAndLog("Remaining write protected area:");

- for (k=0, j=0; k < (wrp-wrc); k++, i++, j += 3) {

+ for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

}

PrintAndLog("Remaining segment payload:");

}

PrintAndLog("Remaining segment payload:");

- for (k=0, j=0; k < (segment_len - wrp - 5); k++, i++, j += 3) {

+ for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

sprintf(&out_string[j], "%02x", (data_buf[i]^crc));

out_string[j+2] = ' ';

};

return 0;

}

};

return 0;

}

+

+int CmdLegicRFRead(const char *Cmd)

+{

+ 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}};

+ SendCommand(&c);

+ return 0;

+}

+

+int CmdLegicLoad(const char *Cmd)

+{

+ char filename[FILE_PATH_SIZE] = {0x00};

+ int len = 0;

+

+ if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) {

+ PrintAndLog("It loads datasamples from the file `filename`");

+ PrintAndLog("Usage: hf legic load <file name>");

+ PrintAndLog(" sample: hf legic load filename");

+ return 0;

+ }

+

+ 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; unsigned int data[8];

+ while(fgets(line, sizeof(line), f)) {

+ int res = sscanf(line, "%x %x %x %x %x %x %x %x",

+ &data[0], &data[1], &data[2], &data[3],

+ &data[4], &data[5], &data[6], &data[7]);

+ if(res != 8) {

+ PrintAndLog("Error: could not read samples");

+ fclose(f);

+ return -1;

+ }

+ UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};

+ int j; for(j = 0; j < 8; j++) {

+ c.d.asBytes[j] = data[j];

+ }

+ SendCommand(&c);

+ WaitForResponse(CMD_ACK, NULL);

+ offset += 8;

+ }

+ fclose(f);

+ PrintAndLog("loaded %u samples", offset);

+ 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];

+

+ 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;

+ }

+

+ FILE *f = fopen(filename, "w");

+ if(!f) {

+ PrintAndLog("couldn't open '%s'", Cmd+1);

+ return -1;

+ }

+

+ GetFromBigBuf(got,requested,offset);

+ WaitForResponse(CMD_ACK,NULL);

+

+ 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;

+}

+

+int CmdLegicRfSim(const char *Cmd)

+{

+ UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};

+ c.arg[0] = 6;

+ c.arg[1] = 3;

+ c.arg[2] = 0;

+ sscanf(Cmd, " %" SCNi64 " %" SCNi64 " %" SCNi64, &c.arg[0], &c.arg[1], &c.arg[2]);

+ SendCommand(&c);

+ return 0;

+}

+

+int CmdLegicRfWrite(const char *Cmd)

+{

+ UsbCommand c={CMD_WRITER_LEGIC_RF};

+ int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64, &c.arg[0], &c.arg[1]);

+ if(res != 2) {

+ PrintAndLog("Please specify the offset and length as two hex strings");

+ return -1;

+ }

+ SendCommand(&c);

+ return 0;

+}

+

+int CmdLegicRfFill(const char *Cmd)

+{

+ UsbCommand cmd ={CMD_WRITER_LEGIC_RF};

+ int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64 " 0x%" SCNx64, &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}};

+ for(i = 0; i < 48; i++) {

+ c.d.asBytes[i] = cmd.arg[2];

+ }

+ for(i = 0; i < 22; i++) {

+ c.arg[0] = i*48;

+ SendCommand(&c);

+ WaitForResponse(CMD_ACK,NULL);

+ }

+ SendCommand(&cmd);

+ return 0;

+ }

+