X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7fe9b0b742d7dae9c5af1d292d11840b5c3cbfae..18b90cce48df64bf528fe358308383bf8b5fba15:/client/cmdhflegic.c?ds=sidebyside diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c index 62ff9428..0262f81c 100644 --- a/client/cmdhflegic.c +++ b/client/cmdhflegic.c @@ -1,31 +1,486 @@ -#include "proxusb.h" +//----------------------------------------------------------------------------- +// Copyright (C) 2010 iZsh +// +// 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 +#include +#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 "); + PrintAndLog("Options :"); + PrintAndLog(" : 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 "); + PrintAndLog(" sample: hf legic load filename"); + return 0; +} + +int usage_legic_read(void){ + PrintAndLog("Read data from a legic tag."); + PrintAndLog("Usage: hf legic read "); + PrintAndLog("Options :"); + PrintAndLog(" : offset in data array to start download from"); + PrintAndLog(" : number of bytes to download"); + PrintAndLog(""); + PrintAndLog(" sample: 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[1024]; // receiver buffer, should be 1024.. + char token_type[4]; + + // 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" + ); + + 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; -int CmdHFLegic(const char *Cmd) -{ - CmdsParse(CommandTable, Cmd); - return 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); + + return 0; + + 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; + + 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) { + + // 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, + > 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, " [] -- Store samples"}, + {"load", CmdLegicLoad, 0, " -- Restore samples"}, + {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"}, + {"write", CmdLegicRfWrite,0, " -- Write sample buffer (user after load or read)"}, + {"fill", CmdLegicRfFill, 0, " -- 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