X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8e220a91260072f1483f1fb41d6ce64459667e4c..fff58476af2e83ff89dbbc6c9804bfea116c88dd:/client/cmdhflegic.c?ds=sidebyside diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c index e2229a73..7ee601b2 100644 --- a/client/cmdhflegic.c +++ b/client/cmdhflegic.c @@ -1,26 +1,34 @@ +//----------------------------------------------------------------------------- +// 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 "proxusb.h" +#include "proxmark3.h" +#include "data.h" +#include "ui.h" #include "cmdparser.h" #include "cmdhflegic.h" - +#include "cmdmain.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"}, + {"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, " [] -- 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"}, {NULL, NULL, 0, NULL} }; @@ -35,3 +43,323 @@ int CmdHelp(const char *Cmd) CmdsHelp(CommandTable); 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) +{ + 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; + uint8_t data_buf[1024]; // receiver buffer + char out_string[3076]; // just use big buffer - bad practice + char token_type[4]; + + // copy data from proxmark into buffer + GetFromBigBuf(data_buf,sizeof(data_buf),0); + WaitForResponse(CMD_ACK,NULL); + + // Output CDF System area (9 bytes) plus remaining header area (12 bytes) + + PrintAndLog("\nCDF: System Area"); + + PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x", + data_buf[0], + data_buf[1], + data_buf[2], + data_buf[3], + data_buf[4] + ); + + crc = data_buf[4]; + + switch (data_buf[5]&0x7f) { + case 0x00 ... 0x2f: + strncpy(token_type, "IAM",sizeof(token_type)); + break; + case 0x30 ... 0x6f: + strcpy(token_type, "SAM"); + break; + case 0x70 ... 0x7f: + strcpy(token_type, "GAM"); + break; + default: + strcpy(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("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", + data_buf[9], + data_buf[10], + data_buf[11], + data_buf[12], + data_buf[13], + data_buf[14], + data_buf[15], + data_buf[16], + data_buf[17], + data_buf[18], + data_buf[19], + data_buf[20], + data_buf[21] + ); + + PrintAndLog("\nADF: User Area"); + + 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; + + wrp = (data_buf[i+2]^crc); + wrc = ((data_buf[i+3]^crc)&0x70)>>4; + + 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", + n, + 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, + (data_buf[i+4]^crc) + ); + + i+=5; + + if (wrc>0) { + PrintAndLog("WRC protected area:"); + 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] = ' '; + }; + + out_string[j] = '\0'; + + PrintAndLog("%s", out_string); + } + + if (wrp>wrc) { + PrintAndLog("Remaining write protected area:"); + + 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] = ' '; + }; + + out_string[j] = '\0'; + + PrintAndLog("%s", out_string); + if((wrp-wrc) == 8) { + sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc); + PrintAndLog("%s", out_string); + } + } + + PrintAndLog("Remaining segment payload:"); + 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] = ' '; + }; + + out_string[j] = '\0'; + + PrintAndLog("%s", out_string); + + // end with last segment + if (segment_flag & 0x8) + 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 "); + 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, + > 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; + } +