mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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361 lines
12 KiB
C
361 lines
12 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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#include "cmdlfem4x05.h" //
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#include "cliparser.h"
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static int CmdHelp(const char *Cmd);
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// find presco preamble 0x10D in already demoded data
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static 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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static int getWiegandFromPrintedPresco(void *arr, uint32_t *fullcode) {
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char *s = (char *)arr;
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uint8_t val = 0;
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for (int i = 0; i < strlen(s); ++i) {
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// Get value from number string.
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if (s[i] == '*')
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val = 10;
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if (s[i] == '#')
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val = 11;
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if (s[i] >= 0x30 && s[i] <= 0x39)
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val = s[i] - 0x30;
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*fullcode += val;
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// last digit is only added, not multipled.
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if (i < strlen(s) - 1)
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*fullcode *= 12;
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}
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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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static 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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//see ASKDemod for what args are accepted
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int demodPresco(bool verbose) {
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(void) verbose; // unused so far
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bool st = true;
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if (ASKDemod_ext(32, 0, 0, 0, false, 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 fullcode = raw4;
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uint32_t usercode = fullcode & 0x0000FFFF;
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uint32_t sitecode = (fullcode >> 24) & 0x000000FF;
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PrintAndLogEx(SUCCESS, "Presco Site code: " _GREEN_("%u") " User code: " _GREEN_("%u") " Full code: " _GREEN_("%08X") " Raw: " _YELLOW_("%08X%08X%08X%08X")
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, sitecode
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, usercode
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, fullcode
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, raw1, raw2, raw3, raw4
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);
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return PM3_SUCCESS;
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}
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static int CmdPrescoDemod(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf presco demod",
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"Try to find presco preamble, if found decode / descramble data",
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"lf presco demod"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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CLIParserFree(ctx);
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return demodPresco(true);
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}
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//see ASKDemod for what args are accepted
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static int CmdPrescoReader(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf presco reader",
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"read a presco tag",
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"lf presco reader -@ -> continuous reader mode"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_lit0("@", NULL, "optional - continuous reader mode"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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bool cm = arg_get_lit(ctx, 1);
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CLIParserFree(ctx);
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do {
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lf_read(false, 12000);
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demodPresco(!cm);
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} while (cm && !kbd_enter_pressed());
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return PM3_SUCCESS;
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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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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf presco clone",
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"clone a presco tag to a T55x7, Q5/T5555 or EM4305/4469 tag.",
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"lf presco clone -d 018363467\n"
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"lf presco clone -d 018363467 --q5 -> encode for Q5/T5555 tag\n"
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"lf presco clone -d 018363467 --em -> encode for EM4305/4469"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_str0("c", NULL, "<hex>", "8 digit hex card number"),
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arg_str0("d", NULL, "<digits>", "9 digit presco card ID"),
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arg_lit0(NULL, "q5", "optional - specify writing to Q5/T5555 tag"),
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arg_lit0(NULL, "em", "optional - specify writing to EM4305/4469 tag"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, false);
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int hex_len = 0;
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uint8_t hex[4] = {0, 0, 0, 0};
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CLIGetHexWithReturn(ctx, 1, hex, &hex_len);
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uint8_t idstr[11];
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int slen = 9;
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memset(idstr, 0x00, sizeof(idstr));
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CLIGetStrWithReturn(ctx, 2, idstr, &slen);
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bool q5 = arg_get_lit(ctx, 3);
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bool em = arg_get_lit(ctx, 4);
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CLIParserFree(ctx);
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if (q5 && em) {
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PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
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return PM3_EINVARG;
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}
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uint32_t fullcode = 0;
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if (hex_len) {
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fullcode = bytes_to_num(hex, hex_len);
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} else {
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//param get string int param_getstr(const char *line, int paramnum, char * str)
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if (slen < 2) {
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PrintAndLogEx(ERR, "Must contain atleast 2 digits");
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return PM3_EINVARG;
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}
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getWiegandFromPrintedPresco(idstr, &fullcode);
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}
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uint32_t usercode = fullcode & 0x0000FFFF; //% 65566
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uint32_t sitecode = (fullcode >> 24) & 0x000000FF; // /= 16777216;
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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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char cardtype[16] = {"T55x7"};
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// Q5
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if (q5) {
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blocks[0] = T5555_FIXED | T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(32) | 4 << T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
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snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
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}
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// EM4305
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if (em) {
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blocks[0] = EM4305_PRESCO_CONFIG_BLOCK;
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snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
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}
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if ((sitecode & 0xFF) != sitecode) {
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sitecode &= 0xFF;
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PrintAndLogEx(INFO, "Site 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, "User code 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 " _GREEN_("%s") " with Site code: " _GREEN_("%u") " User code: " _GREEN_("%u") " Full code: " _GREEN_("%08x")
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, cardtype
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, sitecode
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, usercode
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, fullcode
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);
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print_blocks(blocks, ARRAYLEN(blocks));
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int res;
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if (em) {
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res = em4x05_clone_tag(blocks, ARRAYLEN(blocks), 0, false);
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} else {
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res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
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}
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PrintAndLogEx(SUCCESS, "Done");
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PrintAndLogEx(HINT, "Hint: try " _YELLOW_("`lf presco reader`") " to verify");
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return res;
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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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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf presco sim",
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"Enables simulation of presco card with specified card number.\n"
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"Simulation runs until the button is pressed or another USB command is issued.\n"
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"Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.",
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"lf presco sim -d 018363467"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_str0("c", NULL, "<hex>", "8 digit hex card number"),
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arg_str0("d", NULL, "<digits>", "9 digit presco card ID"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, false);
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int hex_len = 0;
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uint8_t hex[4] = {0, 0, 0, 0};
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CLIGetHexWithReturn(ctx, 1, hex, &hex_len);
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uint8_t idstr[11];
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int slen = 9;
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memset(idstr, 0x00, sizeof(idstr));
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CLIGetStrWithReturn(ctx, 2, idstr, &slen);
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CLIParserFree(ctx);
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uint32_t fullcode = 0;
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if (hex_len) {
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fullcode = bytes_to_num(hex, hex_len);
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} else {
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if (slen < 2) {
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PrintAndLogEx(ERR, "Must contain atleast 2 digits");
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return PM3_EINVARG;
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}
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getWiegandFromPrintedPresco(idstr, &fullcode);
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}
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uint32_t usercode = fullcode & 0x0000FFFF;
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uint32_t sitecode = (fullcode >> 24) & 0x000000FF;
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if ((sitecode & 0xFF) != sitecode) {
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sitecode &= 0xFF;
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PrintAndLogEx(INFO, "Site 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, "User code truncated to 16-bits (Presco): %u", usercode);
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}
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PrintAndLogEx(SUCCESS, "Simulating Presco - Site Code: " _GREEN_("%u") " User Code: " _GREEN_("%u") " Full Code: " _GREEN_("%08X")
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, sitecode
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, usercode
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, fullcode)
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;
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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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{"demod", CmdPrescoDemod, AlwaysAvailable, "demodulate Presco tag from the GraphBuffer"},
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{"reader", CmdPrescoReader, IfPm3Lf, "Attempt to read and Extract tag data"},
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{"clone", CmdPrescoClone, IfPm3Lf, "clone presco tag to T55x7 or 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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