+//-----------------------------------------------------------------------------
+// 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 <stdio.h>
#include <string.h>
-#include "proxusb.h"
+#include "proxmark3.h"
+#include "data.h"
+#include "ui.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"},
- {"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}
};
* 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 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 data_buf[1032]; // receiver buffer
+ uint8_t data_buf[1024]; // receiver buffer
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;
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] = ' ';
};
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] = ' ';
};
}
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] = ' ';
};
};
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, " %"lli" %"lli" %"lli, &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%"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;
+ }
+ SendCommand(&c);
+ return 0;
+}
+
+int CmdLegicRfFill(const char *Cmd)
+{
+ UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
+ 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}};
+ 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;
+ }
+
projects / proxmark3-svn / blobdiff