//-----------------------------------------------------------------------------
// 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
// Low frequency PCF7931 commands
//-----------------------------------------------------------------------------
+#include "cmdlfpcf7931.h"
+
#include <stdio.h>
#include <string.h>
-#include "proxmark3.h"
+#include "comms.h"
#include "ui.h"
+#include "util.h"
#include "graph.h"
#include "cmdparser.h"
#include "cmddata.h"
#include "cmdmain.h"
#include "cmdlf.h"
-#include "cmdlfpcf7931.h"
static int CmdHelp(const char *Cmd);
-struct pcf7931_config configPcf = {{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},17500,{0,0}};
+#define PCF7931_DEFAULT_INITDELAY 17500
+#define PCF7931_DEFAULT_OFFSET_WIDTH 0
+#define PCF7931_DEFAULT_OFFSET_POSITION 0
+
+// Default values - Configuration
+struct pcf7931_config configPcf = {
+ {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},
+ PCF7931_DEFAULT_INITDELAY,
+ PCF7931_DEFAULT_OFFSET_WIDTH,
+ PCF7931_DEFAULT_OFFSET_POSITION
+ };
+
+// Resets the configuration settings to default values.
+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;
+ return 0;
+}
+
+int pcf7931_printConfig(){
+ PrintAndLog("Password (LSB first on bytes) : %s", sprint_hex( configPcf.Pwd, sizeof(configPcf.Pwd)));
+ PrintAndLog("Tag initialization delay : %d us", configPcf.InitDelay);
+ PrintAndLog("Offset low pulses width : %d us", configPcf.OffsetWidth);
+ PrintAndLog("Offset low pulses position : %d us", configPcf.OffsetPosition);
+ return 0;
+}
+
+int usage_pcf7931_read(){
+ PrintAndLog("Usage: lf pcf7931 read [h] ");
+ PrintAndLog("This command tries to read a PCF7931 tag.");
+ PrintAndLog("Options:");
+ PrintAndLog(" h This help");
+ PrintAndLog("Examples:");
+ PrintAndLog(" lf pcf7931 read");
+ return 0;
+}
+
+int usage_pcf7931_write(){
+ PrintAndLog("Usage: lf pcf7931 write [h] <block address> <byte address> <data>");
+ PrintAndLog("This command tries to write a PCF7931 tag.");
+ PrintAndLog("Options:");
+ PrintAndLog(" h This help");
+ PrintAndLog(" blockaddress Block to save [0-7]");
+ PrintAndLog(" byteaddress Index of byte inside block to write [0-15]");
+ PrintAndLog(" data one byte of data (hex)");
+ PrintAndLog("Examples:");
+ PrintAndLog(" lf pcf7931 write 2 1 FF");
+ return 0;
+}
-int CmdLFPCF7931Read(const char *Cmd)
+int usage_pcf7931_bruteforce()
{
- UsbCommand c = {CMD_PCF7931_READ};
- SendCommand(&c);
- UsbCommand resp;
- WaitForResponse(CMD_ACK,&resp);
- return 0;
+ 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 CmdLFPCF7931Config(const char *Cmd)
-{
- int res = 0;
- res = sscanf(Cmd, "%02x %02x %02x %02x %02x %02x %02x %d %d %d", &configPcf.password[0], &configPcf.password[1], &configPcf.password[2], &configPcf.password[3], &configPcf.password[4], &configPcf.password[5], &configPcf.password[6], &configPcf.init_delay, &configPcf.offset[0], &configPcf.offset[1]);
-
- if (res >= 7 || res < 1){
- if(res == 7) configPcf.init_delay = 17500; //default value
-
- if(res<=8){
- configPcf.offset[0] = 0; //default value
- configPcf.offset[1] = 0; //default value
- }
-
- if(res < 1){
- PrintAndLog("Usage: <password byte 1 (in hex, lsb first)> <password byte 2 (in hex, lsb first)> [...] <password byte 7 (in hex, lsb first)> <tag initialization delay (in us)> <optional : offset on the low pulses width (in us)> <optional : offset on the low pulses position (in us)>");
- PrintAndLog("The time offsets could be usefull to correct slew rate generated by the antenna.");
- }
-
- PrintAndLog("Current configuration :");
- PrintAndLog("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", configPcf.password[0], configPcf.password[1], configPcf.password[2], configPcf.password[3], configPcf.password[4], configPcf.password[5], configPcf.password[6]);
- PrintAndLog("Tag initialization delay : %d us", configPcf.init_delay);
- PrintAndLog("Offsets : %d us on the low pulses width, %d us on the low pulses positions", configPcf.offset[0], configPcf.offset[1]);
-
- return 0;
- }
-
- //default values
- configPcf.password[0] = 0xFF;
- configPcf.password[1] = 0xFF;
- configPcf.password[2] = 0xFF;
- configPcf.password[3] = 0xFF;
- configPcf.password[4] = 0xFF;
- configPcf.password[5] = 0xFF;
- configPcf.password[6] = 0xFF;
-
- configPcf.init_delay = 17500;
- configPcf.offset[0] = 0;
- configPcf.offset[1] = 0;
-
- PrintAndLog("Incorrect format");
- PrintAndLog("Examples of right usage : lf pcf7931 config 11 22 33 44 55 66 77 20000");
- PrintAndLog(" lf pcf7931 config FF FF FF FF FF FF FF 17500 -10 30");
- 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");
+ PrintAndLog("The time offsets could be useful to correct slew rate generated by the antenna");
+ PrintAndLog("Caling without some parameter will print the current configuration.");
+ PrintAndLog("Options:");
+ PrintAndLog(" h This help");
+ PrintAndLog(" r Reset configuration to default values");
+ 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("Examples:");
+ PrintAndLog(" lf pcf7931 config");
+ PrintAndLog(" lf pcf7931 config r");
+ PrintAndLog(" lf pcf7931 config 11223344556677 20000");
+ PrintAndLog(" lf pcf7931 config 11223344556677 17500 -10 30");
+ return 0;
}
+int CmdLFPCF7931Read(const char *Cmd){
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();
-int CmdLFPCF7931Write(const char *Cmd)
-{
- UsbCommand c = {CMD_PCF7931_WRITE};
-
- int res = 0;
- res = sscanf(Cmd, "%x %x %x", &c.arg[0], &c.arg[1], &c.arg[2]);
-
- if(res < 1) {
- PrintAndLog("Please specify the block address in hex");
- return 0;
- }
- if (res == 1){
- PrintAndLog("Please specify the byte address in hex");
- return 0;
- }
- if(res == 2) {
- PrintAndLog("Please specify the data in hex (1 byte)");
- return 0;
- }
- if(res == 3) {
- uint8_t n=0;
- for(n=0;n<7;n++) c.d.asDwords[n] = configPcf.password[n];
- c.d.asDwords[7] = (configPcf.offset[0]+128);
- c.d.asDwords[8] = (configPcf.offset[1]+128);
- c.d.asDwords[9] = configPcf.init_delay;
- SendCommand(&c);
- return 0;
- }
-
- PrintAndLog("INCORRECT FORMAT");
- return 0;
+ UsbCommand resp;
+ UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};
+ clearCommandBuffer();
+ SendCommand(&c);
+ if ( !WaitForResponseTimeout(CMD_ACK, &resp, 2500) ) {
+ PrintAndLog("command execution time out");
+ return 1;
+ }
+ return 0;
+}
+
+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 ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();
+
+ configPcf.InitDelay = (param_get32ex(Cmd,1,0,10) & 0xFFFF);
+ configPcf.OffsetWidth = (int)(param_get32ex(Cmd,2,0,10) & 0xFFFF);
+ configPcf.OffsetPosition = (int)(param_get32ex(Cmd,3,0,10) & 0xFFFF);
+
+ pcf7931_printConfig();
+ return 0;
}
+int CmdLFPCF7931Write(const char *Cmd){
+
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ 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);
+
+ UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };
+ memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd) );
+ 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;
+}
+
+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, 1, "Read content of a PCF7931 transponder"},
- {"write", CmdLFPCF7931Write, 1, "Write data on a PCF7931 transponder. Usage : lf pcf7931 write <bloc address> <byte address> <data>"},
- {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
- {NULL, NULL, 0, NULL}
+ {"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}
};
int CmdLFPCF7931(const char *Cmd)
{
- CmdsParse(CommandTable, Cmd);
- return 0;
+ CmdsParse(CommandTable, Cmd);
+ return 0;
}
int CmdHelp(const char *Cmd)
{
- CmdsHelp(CommandTable);
- return 0;
+ CmdsHelp(CommandTable);
+ return 0;
}
projects / proxmark3-svn / blobdiff