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