X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d7fd9084475efe88e647e1127a09a240fcdbed91..4490a4769074e6b5a91f9da1bee2296ac2b42f5f:/client/cmdhflegic.c diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c index 21598bcd..2cfb286e 100644 --- a/client/cmdhflegic.c +++ b/client/cmdhflegic.c @@ -7,65 +7,118 @@ //----------------------------------------------------------------------------- // 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); +#define SESSION_IV 0x55 +#define MAX_LENGTH 1024 + 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 "); - PrintAndLog("Options :"); - PrintAndLog(" : hex bytes in a string"); + PrintAndLog("Usage: hf legic crc8 [h] b u c "); + PrintAndLog("Options:"); + PrintAndLog(" h : this help"); + PrintAndLog(" b : hex bytes"); + PrintAndLog(" u : MCC hexbyte"); + PrintAndLog(" c : 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 "); - PrintAndLog(" sample: hf legic load filename"); + PrintAndLog("Usage: hf legic load [h] "); + PrintAndLog("Options:"); + PrintAndLog(" h : this help"); + PrintAndLog(" : Name of file to load"); + 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 [h] "); + PrintAndLog("Options:"); + PrintAndLog(" h : this help"); + PrintAndLog(" : offset in data array to start download from"); + PrintAndLog(" : number of bytes to download"); + PrintAndLog(" : (optional) Initialization vector to use (ODD and 7bits)"); + PrintAndLog(""); + PrintAndLog("Samples:"); + PrintAndLog(" hf legic read"); + PrintAndLog(" hf legic read 10 4"); + return 0; +} +int usage_legic_sim(void){ + PrintAndLog("Missing help text."); + return 0; +} +int usage_legic_write(void){ + PrintAndLog(" Write sample buffer to a legic tag. (use after load or read)"); + PrintAndLog("Usage: hf legic write [h] "); + PrintAndLog("Options:"); + PrintAndLog(" h : this help"); + PrintAndLog(" : offset in data array to start writing from"); + PrintAndLog(" : number of bytes to write"); + PrintAndLog(" : (optional) Initialization vector to use (ODD and 7bits)"); + PrintAndLog(""); + PrintAndLog("Samples:"); + PrintAndLog(" hf legic write"); + PrintAndLog(" hf legic write 10 4"); + return 0; +} +int usage_legic_rawwrite(void){ + PrintAndLog("Write raw data direct to a specific address on legic tag."); + PrintAndLog("Usage: hf legic writeraw [h]
"); + PrintAndLog("Options:"); + PrintAndLog(" h : this help"); + PrintAndLog("
: address to write to"); + PrintAndLog(" : value to write"); + PrintAndLog(" : (optional) Initialization vector to use (ODD and 7bits)"); + PrintAndLog(""); + PrintAndLog("Samples:"); + PrintAndLog(" hf legic writeraw"); + PrintAndLog(" hf legic writeraw 10 4"); + return 0; +} +int usage_legic_fill(void){ + PrintAndLog("Missing help text."); 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) { - // Index for the bytearray. - int i = 0; - int k = 0, segmentNum; - int segment_len = 0; - int segment_flag = 0; + + int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0; + int crc = 0, wrp = 0, wrc = 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]; + uint8_t data_buf[1024]; // receiver buffer + char token_type[5] = {0,0,0,0,0}; + int dcf = 0; + int bIsSegmented = 0; // copy data from proxmark into buffer GetFromBigBuf(data_buf,sizeof(data_buf),0); - WaitForResponse(CMD_ACK,NULL); - + 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], @@ -75,160 +128,314 @@ int CmdLegicDecode(const char *Cmd) { (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 - ); + token_type[0] = 0; + dcf = ((int)data_buf[6] << 8) | (int)data_buf[5]; - 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] - ); + // New unwritten media? + if(dcf == 0xFFFF) { - PrintAndLog("Remaining Header Area"); - PrintAndLog("%s", sprint_hex(data_buf+9, 13)); + PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)", + dcf, + data_buf[5], + data_buf[6] + ); - uint8_t segCrcBytes[8] = {0x00}; - uint32_t segCalcCRC = 0; - uint32_t segCRC = 0; + } 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)); + fl = (0x7f - (data_buf[5] & 0x7f)) + 1; + break; + } - PrintAndLog("\nADF: User Area"); - i = 22; - // 64 potential segements - 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; + stamp_len = 0xfc - data_buf[6]; + } - wrp = (data_buf[i+2]^crc); - wrc = ((data_buf[i+3]^crc)&0x70)>>4; + 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, + fl + ); - 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: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x (%s)", - segmentNum, - data_buf[i]^crc, - data_buf[i+1]^crc, - data_buf[i+2]^crc, - data_buf[i+3]^crc, - segment_flag, - (segment_flag & 0x4) >> 2, - (segment_flag & 0x8) >> 3, - segment_len, - wrp, - wrc, - ((data_buf[i+3]^crc) & 0x80) >> 7, - segCRC, - ( segCRC == segCalcCRC ) ? "OK" : "fail" + } 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[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] = {0,0,0,0,0,0,0,0}; + uint32_t segCalcCRC = 0; + uint32_t segCRC = 0; - i += 5; + // Data card? + if(dcf <= 60000) { + + PrintAndLog("\nADF: User Area"); + PrintAndLog("------------------------------------------------------"); + + if(bIsSegmented) { + + // Data start point on segmented cards + i = 22; + + // 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; + + 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); - - for ( k=i; k < wrc; k++) - data_buf[k] ^= crc; - - //is WRC / 8? - - // for ( k=i; k < wrc; k += 8) - PrintAndLog("%s", sprint_hex( data_buf+i, wrc ) ); + if ( hasWRC ) { + PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc); + PrintAndLog("\nrow | data"); + PrintAndLog("-----+------------------------------------------------"); + + for ( k=i; k < (i + wrc); ++k) + data_buf[k] ^= crc; + + print_hex_break( data_buf+i, wrc, 16); - i += wrc; - } + 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); - - // // de-xor? - // if ( data_buf[k] > 0) { - // for (k=i; k < wrp_len; k++) - // data_buf[k] ^= crc; - // } + 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("-----+------------------------------------------------"); + + for (k=i; k < (i+wrp_len); ++k) + data_buf[k] ^= crc; - // for (k=i; k < wrp_len; k += 16) { - - PrintAndLog("%s", sprint_hex( data_buf+i, wrp_len)); - // } + print_hex_break( data_buf+i, wrp_len, 16); - i += wrp_len; + i += wrp_len; - // 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); - } + // 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:"); - - // if ( data_buf[k] > 0 ) { - // for ( k=i; k < remain_seg_payload_len; k++) - // data_buf[k] ^= crc; - // } + PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len); + PrintAndLog("\nrow | data"); + PrintAndLog("-----+------------------------------------------------"); + + for ( k=i; k < (i+remain_seg_payload_len); ++k) + data_buf[k] ^= crc; - // for ( k=i; k < remain_seg_payload_len; k++) - PrintAndLog("%s", sprint_hex( data_buf+i, remain_seg_payload_len ) ); + print_hex_break( data_buf+i, remain_seg_payload_len, 16); - i += remain_seg_payload_len; + i += remain_seg_payload_len; - // end with last segment - if (segment_flag & 0x8) return 0; + PrintAndLog("-----+------------------------------------------------\n"); - } // end for loop + // end with last segment + 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] & 0x70) >> 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) { - 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}}; + // params: + // offset in data + // number of bytes. + char cmdp = param_getchar(Cmd, 0); + if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read(); + + uint32_t offset = 0, len = 0, IV = 1; + sscanf(Cmd, "%x %x %x", &offset, &len, &IV); + + // OUT-OF-BOUNDS check + if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset; + + if ( (IV & 0x7F) != IV ){ + IV &= 0x7F; + PrintAndLog("Truncating IV to 7bits"); + } + if ( (IV & 1) == 0 ){ + IV |= 0x01; // IV must be odd + PrintAndLog("LSB of IV must be SET"); + } + PrintAndLog("Current IV: 0x%02x", IV); + + // get some prng bytes from + uint8_t temp[12]; + legic_prng_init(IV); + for ( uint8_t j = 0; j < sizeof(temp); ++j) + temp[j] = legic_prng_get_bits(8); + + PrintAndLog("PRNG: %s", sprint_hex(temp, sizeof(temp))); + + UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}}; clearCommandBuffer(); SendCommand(&c); + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) { + uint8_t isOK = resp.arg[0] & 0xFF; + uint16_t len = resp.arg[1] & 0x3FF; + if ( isOK ) { + PrintAndLog("use 'hf legic decode'"); + } + uint8_t *data = resp.d.asBytes; + PrintAndLog("\nData |"); + PrintAndLog("-----------------------------"); + PrintAndLog(" %s|\n", sprint_hex(data, len)); + // } + } else { + PrintAndLog("command execution time out"); + return 1; + } return 0; } int CmdLegicLoad(const char *Cmd) { - + +// iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :) char cmdp = param_getchar(Cmd, 0); if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load(); @@ -309,9 +516,11 @@ int CmdLegicSave(const char *Cmd) { int requested = 1024; int offset = 0; int delivered = 0; - char filename[FILE_PATH_SIZE]; + char filename[FILE_PATH_SIZE] = {0x00}; uint8_t got[1024] = {0x00}; + memset(filename, 0, FILE_PATH_SIZE); + sscanf(Cmd, " %s %i %i", filename, &requested, &offset); /* If no length given save entire legic read buffer */ @@ -329,15 +538,18 @@ int CmdLegicSave(const char *Cmd) { 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; } - - 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], @@ -352,6 +564,7 @@ int CmdLegicSave(const char *Cmd) { 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]); @@ -361,19 +574,98 @@ int CmdLegicRfSim(const char *Cmd) { } 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"); + + // params: + // offset - in tag memory + // length - num of bytes to be written + // IV - initialisation vector + + char cmdp = param_getchar(Cmd, 0); + if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write(); + + uint32_t offset = 0, len = 0, IV = 0; + + UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}}; + int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV); + if(res < 2) { + PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string"); return -1; } + + // OUT-OF-BOUNDS check + if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset; + + if ( (IV & 0x7F) != IV ){ + IV &= 0x7F; + PrintAndLog("Truncating IV to 7bits"); + } + if ( (IV & 1) == 0 ){ + IV |= 0x01; // IV must be odd + PrintAndLog("LSB of IV must be SET"); + } + + PrintAndLog("Current IV: 0x%02x", IV); + + c.arg[0] = offset; + c.arg[1] = len; + c.arg[2] = IV; + clearCommandBuffer(); SendCommand(&c); return 0; } +int CmdLegicRfRawWrite(const char *Cmd) { + + char cmdp = param_getchar(Cmd, 0); + if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite(); + + uint32_t address = 0, data = 0, IV = 0; + char answer; + + UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} }; + int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV); + if(res < 2) + return usage_legic_rawwrite(); + + // OUT-OF-BOUNDS check + if(address > MAX_LENGTH) + return usage_legic_rawwrite(); + + if ( (IV & 0x7F) != IV ){ + IV &= 0x7F; + PrintAndLog("Truncating IV to 7bits"); + } + if ( (IV & 1) == 0 ){ + IV |= 0x01; // IV must be odd + PrintAndLog("LSB of IV must be SET"); + } + PrintAndLog("Current IV: 0x%02x", IV); + + c.arg[0] = address; + c.arg[1] = data; + c.arg[2] = IV; + + 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"); @@ -382,46 +674,152 @@ int CmdLegicRfFill(const char *Cmd) { 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); return 0; } +void static calc4(uint8_t *cmd, uint8_t len){ + crc_t crc; + //crc_init_ref(&crc, 4, 0x19 >> 1, 0x5, 0, TRUE, TRUE); + crc_init(&crc, 4, 0x19 >> 1, 0x5, 0); + + crc_clear(&crc); + crc_update(&crc, 1, 1); /* CMD_READ */ + crc_update(&crc, cmd[0], 8); + crc_update(&crc, cmd[1], 8); + printf("crc4 %X\n", reflect(crc_finish(&crc), 4) ) ; + + crc_clear(&crc); + crc_update(&crc, 1, 1); /* CMD_READ */ + crc_update(&crc, cmd[0], 8); + crc_update(&crc, cmd[1], 8); + printf("crc4 %X\n", crc_finish(&crc), 4 ) ; + + printf("---- old ---\n"); + crc_update2(&crc, 1, 1); /* CMD_READ */ + crc_update2(&crc, cmd[0], 8); + crc_update2(&crc, cmd[1], 8); + printf("crc4 %X \n", reflect(crc_finish(&crc), 4) ) ; + + + crc_clear(&crc); + crc_update2(&crc, 1, 1); /* CMD_READ */ + crc_update2(&crc, cmd[0], 8); + crc_update2(&crc, cmd[1], 8); + printf("crc4 %X\n", crc_finish(&crc), 4 ) ; +} + 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; - uint8_t *data = malloc(len); - if ( data == NULL ) return 1; - - param_gethex(Cmd, 0, data, len ); + 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; + if (param_getptr(Cmd, &bg, &en, cmdp+1)) { + errors = true; + break; + } + 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; + } + + if (param_gethex(Cmd, cmdp+1, data, len)) { + errors = true; + break; + } + + 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; + case 4: + calc4(data, 0); + 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; } 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"}, + {"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)"}, + {"write", CmdLegicRfWrite,0, " -- Write sample buffer (user after load or read)"}, + {"writeraw",CmdLegicRfRawWrite, 0, "
-- Write direct to address"}, {"fill", CmdLegicRfFill, 0, " -- Fill/Write tag with constant value"}, {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"}, + {"info", CmdLegicCalcCrc8, 1, "Information"}, {NULL, NULL, 0, NULL} };