X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/ad939de5017f3451376d6f559858a30bae675964..2994ab10d64e4121a1894b8f01e350be4fc1e988:/client/cmdlfpcf7931.c

diff --git a/client/cmdlfpcf7931.c b/client/cmdlfpcf7931.c
index 9c694b8d..74bc3b3e 100644
--- a/client/cmdlfpcf7931.c
+++ b/client/cmdlfpcf7931.c
@@ -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
@@ -32,7 +33,7 @@ static int CmdHelp(const char *Cmd);
 struct pcf7931_config configPcf = {
 	{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},
 	PCF7931_DEFAULT_INITDELAY,
-	PCF7931_DEFAULT_OFFSET_WIDTH, 
+	PCF7931_DEFAULT_OFFSET_WIDTH,
 	PCF7931_DEFAULT_OFFSET_POSITION
 	};
 
@@ -40,8 +41,8 @@ struct pcf7931_config configPcf = {
 int pcf7931_resetConfig(){
 	memset(configPcf.Pwd, 0xFF, sizeof(configPcf.Pwd) );
 	configPcf.InitDelay = PCF7931_DEFAULT_INITDELAY;
-	configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH; 
-	configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION; 
+	configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH;
+	configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION;
 	return 0;
 }
 
@@ -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");
@@ -87,7 +103,7 @@ int usage_pcf7931_config(){
 	PrintAndLog("       pwd     Password, hex, 7bytes, LSB-order");
 	PrintAndLog("       delay   Tag initialization delay (in us) decimal");
 	PrintAndLog("       offset  Low pulses width (in us) decimal");
-	PrintAndLog("       offset  Low pulses position (in us) decimal");  
+	PrintAndLog("       offset  Low pulses position (in us) decimal");
 	PrintAndLog("Examples:");
 	PrintAndLog("      lf pcf7931 config");
 	PrintAndLog("      lf pcf7931 config r");
@@ -96,7 +112,7 @@ int usage_pcf7931_config(){
 	return 0;
 }
 
-int CmdLFPCF7931Read(const char *Cmd){  
+int CmdLFPCF7931Read(const char *Cmd){
 
 	uint8_t ctmp = param_getchar(Cmd, 0);
 	if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();
@@ -112,12 +128,12 @@ int CmdLFPCF7931Read(const char *Cmd){
 	return 0;
 }
 
-int CmdLFPCF7931Config(const char *Cmd){ 
+int CmdLFPCF7931Config(const char *Cmd){
 
 	uint8_t ctmp = param_getchar(Cmd, 0);
 	if ( ctmp == 0) return pcf7931_printConfig();
 	if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_config();
-	if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig(); 
+	if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig();
 
 	if ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();
 
@@ -132,17 +148,17 @@ int CmdLFPCF7931Config(const char *Cmd){
 int CmdLFPCF7931Write(const char *Cmd){
 
 	uint8_t ctmp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();  
+	if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();
 
 	uint8_t block = 0, bytepos = 0, data = 0;
-	
+
 	if ( param_getdec(Cmd, 0, &block) ) return usage_pcf7931_write();
 	if ( param_getdec(Cmd, 1, &bytepos) ) return usage_pcf7931_write();
-	
+
 	if ( (block > 7) || (bytepos > 15) ) return usage_pcf7931_write();
 
 	data  = param_get8ex(Cmd, 2, 0, 16);
-	
+
 	PrintAndLog("Writing block: %d", block);
 	PrintAndLog("          pos: %d", bytepos);
 	PrintAndLog("         data: 0x%02X", data);
@@ -159,12 +175,47 @@ int CmdLFPCF7931Write(const char *Cmd){
 	return 0;
 }
 
-static command_t CommandTable[] = 
+int CmdLFPCF7931BruteForce(const char *Cmd){
+
+	uint8_t ctmp = param_getchar(Cmd, 0);
+	if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_bruteforce();
+
+	uint8_t start_password[7] = {0};
+	uint8_t tries = 3;
+
+	if (param_gethex(Cmd, 0, 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[0],
+			start_password[1],
+			start_password[2],
+			start_password[3],
+			start_password[4],
+			start_password[5],
+			start_password[6]);
+
+	PrintAndLog("Trying each password %d times", tries);
+
+	UsbCommand c = {CMD_PCF7931_BRUTEFORCE, {bytes_to_num(start_password, 7), 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}
 };