X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7fe9b0b742d7dae9c5af1d292d11840b5c3cbfae..e3f9c50d81680809c6cdb821dee419a666ecd2c3:/client/cmdhflegic.c

diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index 62ff9428..7b58567f 100644
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -1,31 +1,466 @@
-#include "proxusb.h"
+//-----------------------------------------------------------------------------
+// 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 "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 CmdLegicRFRead(const char *Cmd)
-{
-  UsbCommand c = {CMD_READER_LEGIC_RF};
-  SendCommand(&c);
-  return 0;
+int usage_legic_calccrc8(void){
+	PrintAndLog("Calculates the legic crc8 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("");
+	PrintAndLog("Sample  : hf legic crc8 deadbeef1122");
+	return 0;
 }
 
-static command_t CommandTable[] = 
-{
-  {"help",        CmdHelp,        1, "This help"},
-  {"reader",      CmdLegicRFRead, 0, "Start the LEGIC RF reader"},
-  {NULL, NULL, 0, NULL}
-};
+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");
+	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[1200]; // receiver buffer,  should be 1024..
+	char token_type[4];
+
+	// copy data from proxmark into buffer
+	GetFromBigBuf(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" 
+	);
+ 
+	switch (data_buf[5] & 0x7f) {
+		case 0x00 ... 0x2f:
+			strncpy(token_type, "IAM",sizeof(token_type));
+			break;
+		case 0x30 ... 0x6f:
+			strncpy(token_type, "SAM",sizeof(token_type));
+			break;
+		case 0x70 ... 0x7f:
+			strncpy(token_type, "GAM",sizeof(token_type));
+			break;
+		default:
+			strncpy(token_type, "???",sizeof(token_type));
+			break;
+	}
+
+	stamp_len = 0xfc - data_buf[6];
+
+	PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
+		data_buf[5],
+		data_buf[6],
+		token_type,
+		(data_buf[5]&0x80)>>7,
+		stamp_len
+	);
+
+	PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
+		data_buf[7]&0x0f,
+		(data_buf[7]&0x70)>>4,
+		(data_buf[7]&0x80)>>7,
+		data_buf[7],
+		data_buf[8]
+	);
+
+	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);
+	
+	PrintAndLog("\nADF: User Area");
+	PrintAndLog("------------------------------------------------------");
+	i = 22;  
+	// 64 potential segements
+	// how to detect there is no segments?!?
+	for ( segmentNum=0; segmentNum<64; segmentNum++ ) {
+		segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
+		segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 
-int CmdHFLegic(const char *Cmd)
-{
-  CmdsParse(CommandTable, Cmd);
-  return 0;
+		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("-----+------------------------------------------------");
+			// de-xor?  if not zero, assume it needs xoring.
+			if ( isXored) {
+				for ( k=i; k < 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("-----+------------------------------------------------");
+
+			if (isXored) {
+				for (k=i; k < wrp_len; ++k)
+					data_buf[k] ^= crc;
+			}
+			
+			print_hex_break( data_buf+i, wrp_len, 16);
+			
+			i += wrp_len;
+			
+			// does this one work?
+			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)
+				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
+	return 0;
 }
 
-int CmdHelp(const char *Cmd)
-{
-  CmdsHelp(CommandTable);
-  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}};
+	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;
+}
+
+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);
+	}
+	clearCommandBuffer();
+    SendCommand(&cmd);
+    return 0;
+ }
+
+int CmdLegicCalcCrc8(const char *Cmd){
+
+	int len =  strlen(Cmd);	
+	if ( len & 1 ) return usage_legic_calccrc8(); 
+	
+	// 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();	
+	}
+	
+	uint32_t checksum =  CRC8Legic(data, len/2);	
+	PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
+	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)"},
+	{"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;
+}
\ No newline at end of file