git.zerfleddert.de Git - proxmark3-svn/blob - client/scripting.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2013 m h swende <martin at swende.se>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Some lua scripting glue to proxmark core.
   9 //-----------------------------------------------------------------------------
  10
  11 #include <lua.h>
  12 #include <lualib.h>
  13 #include <lauxlib.h>
  14 #include "proxmark3.h"
  15 #include "usb_cmd.h"
  16 #include "cmdmain.h"
  17 #include "scripting.h"
  18 #include "util.h"
  19 #include "nonce2key/nonce2key.h"
  20 #include "../common/iso15693tools.h"
  21 #include "../common/crc16.h"
  22 #include "../common/crc64.h"
  23 #include "aes.h"
  24 /**
  25  * The following params expected:
  26  *  UsbCommand c
  27  *@brief l_SendCommand
  28  * @param L
  29  * @return
  30  */
  31 static int l_SendCommand(lua_State *L){
  32
  33     /*
  34      *
  35      The SendCommand (native) expects the following structure:
  36
  37      typedef struct {
  38       uint64_t cmd; //8 bytes
  39       uint64_t arg[3]; // 8*3 bytes = 24 bytes
  40       union {
  41         uint8_t  asBytes[USB_CMD_DATA_SIZE]; // 1 byte * 512 = 512 bytes (OR)
  42         uint32_t asDwords[USB_CMD_DATA_SIZE/4]; // 4 byte * 128 = 512 bytes
  43       } d;
  44     } PACKED UsbCommand;
  45
  46     ==> A 544 byte buffer will do.
  47     **/
  48     //Pop cmd
  49     size_t size;
  50     const char *data = luaL_checklstring(L, 1, &size);
  51     if(size != sizeof(UsbCommand))
  52     {
  53         printf("Got data size %d, expected %d" , (int) size,(int) sizeof(UsbCommand));
  54         lua_pushstring(L,"Wrong data size");
  55         return 1;
  56     }
  57
  58 //    UsbCommand c = (*data);
  59     SendCommand((UsbCommand* )data);
  60     return 0; // no return values
  61 }
  62 /**
  63  * @brief The following params expected:
  64  * uint32_t cmd
  65  * size_t ms_timeout
  66  * @param L
  67  * @return
  68  */
  69 static int l_WaitForResponseTimeout(lua_State *L){
  70
  71     uint32_t cmd = 0;
  72     size_t ms_timeout = -1;
  73
  74     //Check number of arguments
  75     int n = lua_gettop(L);
  76     if(n == 0)
  77     {
  78         //signal error by returning Nil, errorstring
  79         lua_pushnil(L);
  80         lua_pushstring(L,"You need to supply at least command to wait for");
  81         return 2; // two return values
  82     }
  83     if(n >= 1)
  84     {
  85         //pop cmd
  86         cmd = luaL_checkunsigned(L,1);
  87     }
  88     if(n >= 2)
  89     {
  90         //Did the user send a timeout ?
  91         //Check if the current top of stack is an integer
  92         ms_timeout = luaL_checkunsigned(L,2);
  93         //printf("Timeout set to %dms\n" , (int) ms_timeout);
  94     }
  95
  96     UsbCommand response;
  97
  98     if(WaitForResponseTimeout(cmd, &response, ms_timeout))
  99     {
 100         //Push it as a string
 101          lua_pushlstring(L,(const char *)&response,sizeof(UsbCommand));
 102
 103         return 1;// return 1 to signal one return value
 104     }else{
 105         //Push a Nil instead
 106         lua_pushnil(L);
 107         return 1;// one return value
 108     }
 109 }
 110
 111 static int returnToLuaWithError(lua_State *L, const char* fmt, ...)
 112 {
 113     char buffer[200];
 114     va_list args;
 115     va_start(args,fmt);
 116     vsnprintf(buffer, sizeof(buffer), fmt,args);
 117     va_end(args);
 118
 119     lua_pushnil(L);
 120     lua_pushstring(L,buffer);
 121     return 2;
 122 }
 123
 124 static int l_nonce2key(lua_State *L){
 125
 126     size_t size;
 127     const char *p_uid = luaL_checklstring(L, 1, &size);
 128     if(size != 4)  return returnToLuaWithError(L,"Wrong size of uid, got %d bytes, expected 4", (int) size);
 129
 130     const char *p_nt = luaL_checklstring(L, 2, &size);
 131     if(size != 4)  return returnToLuaWithError(L,"Wrong size of nt, got %d bytes, expected 4", (int) size);
 132
 133     const char *p_nr = luaL_checklstring(L, 3, &size);
 134     if(size != 4)  return returnToLuaWithError(L,"Wrong size of nr, got %d bytes, expected 4", (int) size);
 135
 136     const char *p_par_info = luaL_checklstring(L, 4, &size);
 137     if(size != 8)  return returnToLuaWithError(L,"Wrong size of par_info, got %d bytes, expected 8", (int) size);
 138
 139     const char *p_pks_info = luaL_checklstring(L, 5, &size);
 140     if(size != 8)  return returnToLuaWithError(L,"Wrong size of ks_info, got %d bytes, expected 8", (int) size);
 141
 142
 143     uint32_t uid = bytes_to_num(( uint8_t *)p_uid,4);
 144     uint32_t nt = bytes_to_num(( uint8_t *)p_nt,4);
 145
 146     uint32_t nr = bytes_to_num(( uint8_t*)p_nr,4);
 147     uint64_t par_info = bytes_to_num(( uint8_t *)p_par_info,8);
 148     uint64_t ks_info = bytes_to_num(( uint8_t *)p_pks_info,8);
 149
 150     uint64_t key = 0;
 151
 152     int retval = nonce2key(uid,nt, nr, par_info,ks_info, &key);
 153
 154     //Push the retval on the stack
 155     lua_pushinteger(L,retval);
 156
 157     //Push the key onto the stack
 158     uint8_t dest_key[8];
 159     num_to_bytes(key,sizeof(dest_key),dest_key);
 160
 161     //printf("Pushing to lua stack: %012"llx"\n",key);
 162     lua_pushlstring(L,(const char *) dest_key,sizeof(dest_key));
 163
 164     return 2; //Two return values
 165 }
 166 //static int l_PrintAndLog(lua_State *L){ return CmdHF14AMfDump(luaL_checkstring(L, 1));}
 167 static int l_clearCommandBuffer(lua_State *L){
 168     clearCommandBuffer();
 169     return 0;
 170 }
 171 /**
 172  * @brief l_foobar is a dummy function to test lua-integration with
 173  * @param L
 174  * @return
 175  */
 176 static int l_foobar(lua_State *L)
 177 {
 178     //Check number of arguments
 179     int n = lua_gettop(L);
 180     printf("foobar called with %d arguments" , n);
 181     lua_settop(L, 0);
 182     printf("Arguments discarded, stack now contains %d elements", lua_gettop(L));
 183
 184     // todo: this is not used, where was it intended for?
 185     // UsbCommand response =  {CMD_MIFARE_READBL, {1337, 1338, 1339}};
 186
 187     printf("Now returning a uint64_t as a string");
 188     uint64_t x = 0xDEADBEEF;
 189     uint8_t destination[8];
 190     num_to_bytes(x,sizeof(x),destination);
 191     lua_pushlstring(L,(const char *)&x,sizeof(x));
 192     lua_pushlstring(L,(const char *)destination,sizeof(destination));
 193
 194     return 2;
 195 }
 196
 197
 198 /**
 199  * @brief Utility to check if a key has been pressed by the user. This method does not block.
 200  * @param L
 201  * @return boolean, true if kbhit, false otherwise.
 202  */
 203 static int l_ukbhit(lua_State *L)
 204 {
 205     lua_pushboolean(L,ukbhit() ? true : false);
 206     return 1;
 207 }
 208 /**
 209  * @brief Calls the command line parser to deal with the command. This enables
 210  * lua-scripts to do stuff like "core.console('hf mf mifare')"
 211  * @param L
 212  * @return
 213  */
 214 static int l_CmdConsole(lua_State *L)
 215 {
 216     CommandReceived((char *)luaL_checkstring(L, 1));
 217     return 0;
 218 }
 219
 220 static int l_iso15693_crc(lua_State *L)
 221 {
 222     //    uint16_t Iso15693Crc(uint8_t *v, int n);
 223     size_t size;
 224     const char *v = luaL_checklstring(L, 1, &size);
 225     uint16_t retval = Iso15693Crc((uint8_t *) v, size);
 226     lua_pushinteger(L, (int) retval);
 227     return 1;
 228 }
 229
 230 /*
 231  Simple AES 128 cbc hook up to OpenSSL.
 232  params:  key, input
 233 */
 234 static int l_aes128decrypt(lua_State *L)
 235 {
 236         //Check number of arguments
 237         int i;
 238     size_t size;
 239     const char *p_key = luaL_checklstring(L, 1, &size);
 240     if(size != 32)  return returnToLuaWithError(L,"Wrong size of key, got %d bytes, expected 32", (int) size);
 241
 242     const char *p_encTxt = luaL_checklstring(L, 2, &size);
 243
 244         unsigned char indata[16] = {0x00};
 245         unsigned char outdata[16] = {0x00};
 246     unsigned char aes_key[16] = {0x00};
 247         unsigned char iv[16] = {0x00};
 248
 249         for (i = 0; i < 32; i += 2) {
 250                 sscanf(&p_encTxt[i], "%02x", (unsigned int *)&indata[i / 2]);
 251                 sscanf(&p_key[i], "%02x", (unsigned int *)&aes_key[i / 2]);
 252         }
 253
 254     aes_context ctx;
 255     aes_init(&ctx);
 256     //aes_setkey_enc(&ctx, (const unsigned char *)aes_key, 128);
 257         aes_setkey_dec(&ctx, aes_key, 128);
 258         aes_crypt_cbc(&ctx, AES_DECRYPT, sizeof(indata), iv, indata, outdata );
 259     //Push decrypted array as a string
 260         lua_pushlstring(L,(const char *)&outdata, sizeof(outdata));
 261         return 1;// return 1 to signal one return value
 262 }
 263 static int l_aes128encrypt(lua_State *L)
 264 {
 265         //Check number of arguments
 266         int i;
 267     size_t size;
 268     const char *p_key = luaL_checklstring(L, 1, &size);
 269     if(size != 32)  return returnToLuaWithError(L,"Wrong size of key, got %d bytes, expected 32", (int) size);
 270
 271     const char *p_txt = luaL_checklstring(L, 2, &size);
 272
 273         unsigned char indata[16] = {0x00};
 274         unsigned char outdata[16] = {0x00};
 275     unsigned char aes_key[16] = {0x00};
 276         unsigned char iv[16] = {0x00};
 277
 278         for (i = 0; i < 32; i += 2) {
 279                 sscanf(&p_txt[i], "%02x", (unsigned int *)&indata[i / 2]);
 280                 sscanf(&p_key[i], "%02x", (unsigned int *)&aes_key[i / 2]);
 281         }
 282
 283     aes_context ctx;
 284     aes_init(&ctx);
 285     aes_setkey_enc(&ctx, aes_key, 128);
 286         aes_crypt_cbc(&ctx, AES_ENCRYPT, sizeof(indata), iv, indata, outdata );
 287     //Push encrypted array as a string
 288         lua_pushlstring(L,(const char *)&outdata, sizeof(outdata));
 289         return 1;// return 1 to signal one return value
 290 }
 291
 292 static int l_crc16(lua_State *L)
 293 {
 294         size_t size;
 295         const char *p_str = luaL_checklstring(L, 1, &size);
 296
 297         uint16_t retval = crc16_ccitt( (uint8_t*) p_str, size);
 298     lua_pushinteger(L, (int) retval);
 299     return 1;
 300 }
 301
 302 static int l_crc64(lua_State *L)
 303 {
 304         size_t size;
 305         uint64_t crc = 0;
 306         unsigned char outdata[8] = {0x00};
 307
 308         const char *p_str = luaL_checklstring(L, 1, &size);
 309
 310         crc64( (uint8_t*) p_str, size, &crc);
 311
 312         outdata[0] = (uint8_t)(crc >> 56) & 0xff;
 313         outdata[1] = (uint8_t)(crc >> 48) & 0xff;
 314         outdata[2] = (uint8_t)(crc >> 40) & 0xff;
 315         outdata[3] = (uint8_t)(crc >> 32) & 0xff;
 316         outdata[4] = (uint8_t)(crc >> 24) & 0xff;
 317         outdata[5] = (uint8_t)(crc >> 16) & 0xff;
 318         outdata[6] = (uint8_t)(crc >> 8) & 0xff;
 319         outdata[7] = crc & 0xff;
 320         lua_pushlstring(L,(const char *)&outdata, sizeof(outdata));
 321     return 1;
 322 }
 323
 324 /**
 325  * @brief Sets the lua path to include "./lualibs/?.lua", in order for a script to be
 326  * able to do "require('foobar')" if foobar.lua is within lualibs folder.
 327  * Taken from http://stackoverflow.com/questions/4125971/setting-the-global-lua-path-variable-from-c-c
 328  * @param L
 329  * @param path
 330  * @return
 331  */
 332 int setLuaPath( lua_State* L, const char* path )
 333 {
 334     lua_getglobal( L, "package" );
 335     lua_getfield( L, -1, "path" ); // get field "path" from table at top of stack (-1)
 336     const char* cur_path = lua_tostring( L, -1 ); // grab path string from top of stack
 337     int requiredLength = strlen(cur_path)+ strlen(path)+10; //A few bytes too many, whatever we can afford it
 338     char * buf = malloc(requiredLength);
 339     snprintf(buf, requiredLength, "%s;%s", cur_path, path);
 340     lua_pop( L, 1 ); // get rid of the string on the stack we just pushed on line 5
 341     lua_pushstring( L, buf ); // push the new one
 342     lua_setfield( L, -2, "path" ); // set the field "path" in table at -2 with value at top of stack
 343     lua_pop( L, 1 ); // get rid of package table from top of stack
 344     free(buf);
 345         return 0; // all done!
 346 }
 347
 348
 349 int set_pm3_libraries(lua_State *L)
 350 {
 351
 352     static const luaL_Reg libs[] = {
 353         {"SendCommand",                 l_SendCommand},
 354         {"WaitForResponseTimeout",      l_WaitForResponseTimeout},
 355         {"nonce2key",                   l_nonce2key},
 356         //{"PrintAndLog",                 l_PrintAndLog},
 357         {"foobar",                      l_foobar},
 358         {"ukbhit",                      l_ukbhit},
 359         {"clearCommandBuffer",          l_clearCommandBuffer},
 360         {"console",                     l_CmdConsole},
 361         {"iso15693_crc",                l_iso15693_crc},
 362                 {"aes128_decrypt",              l_aes128decrypt},
 363                 {"aes128_encrypt",              l_aes128encrypt},
 364                 {"crc16",                       l_crc16},
 365                 {"crc64",                                               l_crc64},
 366         {NULL, NULL}
 367     };
 368
 369     lua_pushglobaltable(L);
 370     // Core library is in this table. Contains '
 371     //this is 'pm3' table
 372     lua_newtable(L);
 373
 374     //Put the function into the hash table.
 375     for (int i = 0; libs[i].name; i++) {
 376         lua_pushcfunction(L, libs[i].func);
 377         lua_setfield(L, -2, libs[i].name);//set the name, pop stack
 378     }
 379     //Name of 'core'
 380     lua_setfield(L, -2, "core");
 381
 382     //-- remove the global environment table from the stack
 383     lua_pop(L, 1);
 384
 385     //-- Last but not least, add to the LUA_PATH (package.path in lua)
 386     // so we can load libraries from the ./lualib/ - directory
 387     setLuaPath(L,"./lualibs/?.lua");
 388
 389     return 1;
 390 }