mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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281 lines
10 KiB
C
281 lines
10 KiB
C
//-----------------------------------------------------------------------------
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Low frequency Presco tag commands
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//-----------------------------------------------------------------------------
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#include "cmdlfpresco.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "commonutil.h" // ARRAYLEN
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#include "cmdparser.h" // command_t
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#include "comms.h"
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#include "ui.h"
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#include "cmddata.h"
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#include "cmdlf.h"
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#include "protocols.h" // for T55xx config register definitions
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#include "lfdemod.h" // parityTest
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#include "cmdlft55xx.h" // verifywrite
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static int CmdHelp(const char *Cmd);
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static int usage_lf_presco_clone(void) {
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PrintAndLogEx(NORMAL, "clone a Presco tag to a T55x7 tag.");
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PrintAndLogEx(NORMAL, "Usage: lf presco clone [h] d <Card-ID> c <hex-ID> <Q5>");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : this help");
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PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card ID");
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PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
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PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf presco clone d 123456789");
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return PM3_SUCCESS;
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}
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static int usage_lf_presco_sim(void) {
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PrintAndLogEx(NORMAL, "Enables simulation of presco card with specified card number.");
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PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
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PrintAndLogEx(NORMAL, "Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Usage: lf presco sim [h] d <Card-ID> or c <hex-ID>");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : this help");
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PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card number");
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PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf presco sim d 123456789");
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return PM3_SUCCESS;
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}
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//see ASKDemod for what args are accepted
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static int CmdPrescoDemod(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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bool st = true;
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if (ASKDemod_ext("32 0 0 0 0 a", false, false, 1, &st) != PM3_SUCCESS) {
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PrintAndLogEx(DEBUG, "DEBUG: Error Presco ASKDemod failed");
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return PM3_ESOFT;
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}
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size_t size = DemodBufferLen;
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int ans = detectPresco(DemodBuffer, &size);
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if (ans < 0) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: Size not correct: %zu", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: ans: %d", ans);
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return PM3_ESOFT;
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}
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setDemodBuff(DemodBuffer, 128, ans);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
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//got a good demod
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uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
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uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
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uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
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uint32_t raw4 = bytebits_to_byte(DemodBuffer + 96, 32);
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uint32_t cardid = raw4;
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PrintAndLogEx(SUCCESS, "Presco Tag Found: Card ID %08X, Raw: %08X%08X%08X%08X", cardid, raw1, raw2, raw3, raw4);
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uint32_t sitecode = 0, usercode = 0, fullcode = 0;
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bool Q5 = false;
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char cmd[12] = {0};
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sprintf(cmd, "H %08X", cardid);
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getWiegandFromPresco(cmd, &sitecode, &usercode, &fullcode, &Q5);
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PrintAndLogEx(SUCCESS, "SiteCode %u, UserCode %u, FullCode, %08X", sitecode, usercode, fullcode);
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return PM3_SUCCESS;
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}
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//see ASKDemod for what args are accepted
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static int CmdPrescoRead(const char *Cmd) {
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// Presco Number: 123456789 --> Sitecode 30 | usercode 8665
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lf_read(true, 12000);
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return CmdPrescoDemod(Cmd);
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}
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// takes base 12 ID converts to hex
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// Or takes 8 digit hex ID
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static int CmdPrescoClone(const char *Cmd) {
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bool Q5 = false;
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uint32_t sitecode = 0, usercode = 0, fullcode = 0;
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uint32_t blocks[5] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 4 << T55x7_MAXBLOCK_SHIFT | T55x7_ST_TERMINATOR, 0, 0, 0, 0};
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// get wiegand from printed number.
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if (getWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == PM3_EINVARG) return usage_lf_presco_clone();
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if (Q5)
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blocks[0] = T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(32) | 4 << T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
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if ((sitecode & 0xFF) != sitecode) {
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sitecode &= 0xFF;
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PrintAndLogEx(INFO, "Facility-Code Truncated to 8-bits (Presco): %u", sitecode);
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}
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if ((usercode & 0xFFFF) != usercode) {
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usercode &= 0xFFFF;
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PrintAndLogEx(INFO, "Card Number Truncated to 16-bits (Presco): %u", usercode);
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}
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blocks[1] = 0x10D00000; //preamble
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blocks[2] = 0x00000000;
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blocks[3] = 0x00000000;
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blocks[4] = fullcode;
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PrintAndLogEx(INFO, "Preparing to clone Presco to T55x7 with SiteCode: %u, UserCode: %u, FullCode: %08x", sitecode, usercode, fullcode);
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print_blocks(blocks, ARRAYLEN(blocks));
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return clone_t55xx_tag(blocks, ARRAYLEN(blocks));
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}
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// takes base 12 ID converts to hex
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// Or takes 8 digit hex ID
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static int CmdPrescoSim(const char *Cmd) {
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uint32_t sitecode = 0, usercode = 0, fullcode = 0;
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bool Q5 = false;
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// get wiegand from printed number.
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if (getWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == PM3_EINVARG)
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return usage_lf_presco_sim();
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PrintAndLogEx(SUCCESS, "Simulating Presco - SiteCode: %u, UserCode: %u, FullCode: %08X", sitecode, usercode, fullcode);
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uint8_t bs[128];
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getPrescoBits(fullcode, bs);
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lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + sizeof(bs));
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payload->encoding = 1;
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payload->invert = 0;
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payload->separator = 1;
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payload->clock = 32;
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memcpy(payload->data, bs, sizeof(bs));
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clearCommandBuffer();
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SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + sizeof(bs));
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free(payload);
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PacketResponseNG resp;
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WaitForResponse(CMD_LF_ASK_SIMULATE, &resp);
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PrintAndLogEx(INFO, "Done");
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if (resp.status != PM3_EOPABORTED)
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return resp.status;
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return PM3_SUCCESS;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, AlwaysAvailable, "This help"},
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{"read", CmdPrescoRead, IfPm3Lf, "Attempt to read and Extract tag data"},
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{"clone", CmdPrescoClone, IfPm3Lf, "clone presco tag to T55x7 (or to q5/T5555)"},
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{"sim", CmdPrescoSim, IfPm3Lf, "simulate presco tag"},
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{NULL, NULL, NULL, NULL}
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};
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static int CmdHelp(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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CmdsHelp(CommandTable);
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return PM3_SUCCESS;
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}
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int CmdLFPresco(const char *Cmd) {
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clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
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// find presco preamble 0x10D in already demoded data
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int detectPresco(uint8_t *dest, size_t *size) {
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if (*size < 128 * 2) return -1; //make sure buffer has data
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size_t startIdx = 0;
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uint8_t preamble[] = {0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
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return -2; //preamble not found
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if (*size != 128) return -3; //wrong demoded size
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//return start position
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return (int)startIdx;
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}
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// convert base 12 ID to sitecode & usercode & 8 bit other unknown code
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int getWiegandFromPresco(const char *Cmd, uint32_t *sitecode, uint32_t *usercode, uint32_t *fullcode, bool *Q5) {
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bool hex = false, errors = false;
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uint8_t cmdp = 0;
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char id[11];
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int stringlen = 0;
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memset(id, 0x00, sizeof(id));
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while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
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switch (tolower(param_getchar(Cmd, cmdp))) {
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case 'h':
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return PM3_EINVARG;
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case 'c':
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hex = true;
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//get hex
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*fullcode = param_get32ex(Cmd, cmdp + 1, 0, 16);
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cmdp += 2;
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break;
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case 'd':
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//param get string int param_getstr(const char *line, int paramnum, char * str)
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stringlen = param_getstr(Cmd, cmdp + 1, id, sizeof(id));
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if (stringlen < 2) return PM3_EINVARG;
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cmdp += 2;
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break;
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case 'q':
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*Q5 = true;
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cmdp++;
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break;
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default:
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PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
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errors = 1;
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break;
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}
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}
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//Validations
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if (errors || cmdp == 0) return PM3_EINVARG;
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if (!hex) {
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uint8_t val = 0;
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for (int index = 0; index < strlen(id); ++index) {
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// Get value from number string.
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if (id[index] == '*')
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val = 10;
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if (id[index] == '#')
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val = 11;
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if (id[index] >= 0x30 && id[index] <= 0x39)
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val = id[index] - 0x30;
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*fullcode += val;
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// last digit is only added, not multipled.
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if (index < strlen(id) - 1)
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*fullcode *= 12;
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}
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}
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*usercode = *fullcode & 0x0000FFFF; //% 65566
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*sitecode = (*fullcode >> 24) & 0x000000FF; // /= 16777216;
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return PM3_SUCCESS;
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}
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// calc not certain - intended to get bitstream for programming / sim
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int getPrescoBits(uint32_t fullcode, uint8_t *prescoBits) {
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num_to_bytebits(0x10D00000, 32, prescoBits);
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num_to_bytebits(0x00000000, 32, prescoBits + 32);
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num_to_bytebits(0x00000000, 32, prescoBits + 64);
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num_to_bytebits(fullcode, 32, prescoBits + 96);
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return PM3_SUCCESS;
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}
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int demodPresco(void) {
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return CmdPrescoDemod("");
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}
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