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