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PCF7931: improved read code and implemented a simple password bruteforce (#745)

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* Improved PCF 7931 read code and implemented a simple PCF7931 password bruteforce
* Warning on the PCF7931 bruteforce command
This commit is contained in:
Samuele 2019-01-06 18:33:06 +01:00 • committed by pwpiwi
commit 818e15b0c8
6 changed files with 349 additions and 237 deletions
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51
client/cmdlfpcf7931.c
View file

@ -1,6 +1,7 @@
//-----------------------------------------------------------------------------
// Copyright (C) 2012 Chalk <chalk.secu at gmail.com>
// 2015 Dake <thomas.cayrou at gmail.com>
// 2018 sguerrini97 <sguerrini97 at gmail.com>
// 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
@ -76,6 +77,21 @@ int usage_pcf7931_write(){
return 0;
}
int usage_pcf7931_bruteforce()
{
PrintAndLog("Usage: lf pcf7931 bruteforce [h] <start password> <tries>");
PrintAndLog("This command tries to disable PAC of a PCF7931 transponder by bruteforcing the password.");
PrintAndLog("!! THIS IS NOT INTENDED TO RECOVER THE FULL PASSWORD !!");
PrintAndLog("!! DO NOT USE UNLESS THE FIRST 5 BYTES OF THE PASSWORD ARE KNOWN !!");
PrintAndLog("Options:");
PrintAndLog(" h This help");
PrintAndLog(" start password hex password to start from");
PrintAndLog(" tries How many times to send the same data frame");
PrintAndLog("Examples:");
PrintAndLog(" lf pcf7931 bruteforce 00000000123456 3");
return 0;
}
int usage_pcf7931_config(){
PrintAndLog("Usage: lf pcf7931 config [h] [r] <pwd> <delay> <offset width> <offset position>");
PrintAndLog("This command tries to set the configuration used with PCF7931 commands");
@ -159,12 +175,47 @@ int CmdLFPCF7931Write(const char *Cmd){
return 0;
}
int CmdLFPCF7931BruteForce(const char *Cmd){
uint8_t ctmp = param_getchar(Cmd, 0);
if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_bruteforce();
uint64_t start_password = 0;
uint8_t tries = 3;
if (param_gethex(Cmd, 0, (uint8_t*)(&start_password), 14)) return usage_pcf7931_bruteforce();
if (param_getdec(Cmd, 1, &tries)) return usage_pcf7931_bruteforce();
PrintAndLog("Bruteforcing from password: %02x %02x %02x %02x %02x %02x %02x",
start_password & 0xFF,
(start_password >> 8) & 0xFF,
(start_password >> 16) & 0xFF,
(start_password >> 24) & 0xFF,
(start_password >> 32) & 0xFF,
(start_password >> 48) & 0xFF,
(start_password >> 56) & 0xFF);
PrintAndLog("Trying each password %d times", tries);
UsbCommand c = {CMD_PCF7931_BRUTEFORCE, {start_password, tries} };
c.d.asDwords[7] = (configPcf.OffsetWidth + 128);
c.d.asDwords[8] = (configPcf.OffsetPosition + 128);
c.d.asDwords[9] = configPcf.InitDelay;
clearCommandBuffer();
SendCommand(&c);
//no ack?
return 0;
}
static command_t CommandTable[] =
{
{"help", CmdHelp, 1, "This help"},
{"read", CmdLFPCF7931Read, 0, "Read content of a PCF7931 transponder"},
{"write", CmdLFPCF7931Write, 0, "Write data on a PCF7931 transponder."},
{"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
{"bruteforce", CmdLFPCF7931BruteForce, 0, "Bruteforce a PCF7931 transponder password."},
{NULL, NULL, 0, NULL}
};

3
client/cmdlfpcf7931.h
View file

@ -1,6 +1,7 @@
//-----------------------------------------------------------------------------
// Copyright (C) 2012 Chalk <chalk.secu at gmail.com>
// 2015 Dake <thomas.cayrou at gmail.com>
// 2018 sguerrini97 <sguerrini97 at gmail.com>
// 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
@ -26,12 +27,14 @@ int pcf7931_printConfig();
int usage_pcf7931_read();
int usage_pcf7931_write();
int usage_pcf7931_bruteforce();
int usage_pcf7931_config();
int CmdLFPCF7931(const char *Cmd);
int CmdLFPCF7931Read(const char *Cmd);
int CmdLFPCF7931Write(const char *Cmd);
int CmdLFPCF7931BruteForce(const char *Cmd);
int CmdLFPCF7931Config(const char *Cmd);
#endif