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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2018 Merlok
   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 // EMV json logic
   9 //-----------------------------------------------------------------------------
  10
  11 #include "emvjson.h"
  12 #include <ctype.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <inttypes.h>
  16 #include <string.h>
  17 #include "util.h"
  18 #include "ui.h"
  19 #include "proxmark3.h"
  20 #include "emv_tags.h"
  21
  22 static const ApplicationDataElm ApplicationData[] = {
  23 {0x82,    "AIP"},
  24 {0x94,    "AFL"},
  25
  26 {0x5A,    "PAN"},
  27 {0x5F34,  "PANSeqNo"},
  28 {0x5F24,  "ExpirationDate"},
  29 {0x5F25,  "EffectiveDate"},
  30 {0x5F28,  "IssuerCountryCode"},
  31
  32 {0x50,    "ApplicationLabel"},
  33 {0x9F08,  "VersionNumber"},
  34 {0x9F42,  "CurrencyCode"},
  35 {0x5F2D,  "LanguagePreference"},
  36 {0x87,    "PriorityIndicator"},
  37 {0x9F36,  "ATC"}, //Application Transaction Counter
  38
  39 {0x5F20,  "CardholderName"},
  40
  41 {0x9F38,  "PDOL"},
  42 {0x8C,    "CDOL1"},
  43 {0x8D,    "CDOL2"},
  44
  45 {0x9F07,  "AUC"},   // Application Usage Control
  46 {0x9F6C,  "CTQ"},
  47 {0x8E,    "CVMList"},
  48 {0x9F0D,  "IACDefault"},
  49 {0x9F0E,  "IACDeny"},
  50 {0x9F0F,  "IACOnline"},
  51
  52 {0x8F,    "CertificationAuthorityPublicKeyIndex"},
  53 {0x9F32,  "IssuerPublicKeyExponent"},
  54 {0x92,    "IssuerPublicKeyRemainder"},
  55 {0x90,    "IssuerPublicKeyCertificate"},
  56 {0x9F47,  "ICCPublicKeyExponent"},
  57 {0x9F46,  "ICCPublicKeyCertificate"},
  58
  59 {0x00,    "end..."}
  60 };
  61 int ApplicationDataLen = sizeof(ApplicationData) / sizeof(ApplicationDataElm);
  62
  63 char* GetApplicationDataName(tlv_tag_t tag) {
  64         for (int i = 0; i < ApplicationDataLen; i++)
  65                 if (ApplicationData[i].Tag == tag)
  66                         return ApplicationData[i].Name;
  67
  68         return NULL;
  69 }
  70
  71 int JsonSaveJsonObject(json_t *root, char *path, json_t *value) {
  72         json_error_t error;
  73
  74         if (strlen(path) < 1)
  75                 return 1;
  76
  77         if (path[0] == '$') {
  78                 if (json_path_set(root, path, value, 0, &error)) {
  79                         PrintAndLog("ERROR: can't set json path: ", error.text);
  80                         return 2;
  81                 } else {
  82                         return 0;
  83                 }
  84         } else {
  85                 return json_object_set_new(root, path, value);
  86         }
  87 }
  88
  89 int JsonSaveInt(json_t *root, char *path, int value) {
  90         return JsonSaveJsonObject(root, path, json_integer(value));
  91 }
  92
  93 int JsonSaveStr(json_t *root, char *path, char *value) {
  94         return JsonSaveJsonObject(root, path, json_string(value));
  95 };
  96
  97 int JsonSaveBufAsHexCompact(json_t *elm, char *path, uint8_t *data, size_t datalen) {
  98         char * msg = sprint_hex_inrow(data, datalen);
  99         if (msg && strlen(msg) && msg[strlen(msg) - 1] == ' ')
 100                 msg[strlen(msg) - 1] = '\0';
 101
 102         return JsonSaveStr(elm, path, msg);
 103 }
 104
 105 int JsonSaveBufAsHex(json_t *elm, char *path, uint8_t *data, size_t datalen) {
 106         char * msg = sprint_hex(data, datalen);
 107         if (msg && strlen(msg) && msg[strlen(msg) - 1] == ' ')
 108                 msg[strlen(msg) - 1] = '\0';
 109
 110         return JsonSaveStr(elm, path, msg);
 111 }
 112
 113 int JsonSaveHex(json_t *elm, char *path, uint64_t data, int datalen) {
 114         uint8_t bdata[8] = {0};
 115         int len = 0;
 116         if (!datalen) {
 117                 for (uint64_t u = 0xffffffffffffffff; u; u = u << 8) {
 118                         if (!(data & u)) {
 119                                 break;
 120                         }
 121                         len++;
 122                 }
 123                 if (!len)
 124                         len = 1;
 125         } else {
 126                 len = datalen;
 127         }
 128         num_to_bytes(data, len, bdata);
 129
 130         return JsonSaveBufAsHex(elm, path, bdata, len);
 131 }
 132
 133 int JsonSaveTLVValue(json_t *root, char *path, struct tlvdb *tlvdbelm) {
 134         const struct tlv *tlvelm = tlvdb_get_tlv(tlvdbelm);
 135         if (tlvelm)
 136                 return JsonSaveBufAsHex(root, path, (uint8_t *)tlvelm->value, tlvelm->len);
 137         else
 138                 return 1;
 139 }
 140
 141 int JsonSaveTLVElm(json_t *elm, char *path, struct tlv *tlvelm, bool saveName, bool saveValue, bool saveAppDataLink) {
 142         json_error_t error;
 143
 144         if (strlen(path) < 1 || !tlvelm)
 145                 return 1;
 146
 147         if (path[0] == '$') {
 148
 149                 json_t *obj = json_path_get(elm, path);
 150                 if (!obj) {
 151                         obj = json_object();
 152
 153                         if (json_is_array(elm)) {
 154                                 if (json_array_append_new(elm, obj)) {
 155                                         PrintAndLog("ERROR: can't append array: %s", path);
 156                                         return 2;
 157                                 }
 158                         } else {
 159                                 if (json_path_set(elm, path, obj, 0, &error)) {
 160                                         PrintAndLog("ERROR: can't set json path: ", error.text);
 161                                         return 2;
 162                                 }
 163                         }
 164                 }
 165
 166                 if (saveAppDataLink) {
 167                         char * AppDataName = GetApplicationDataName(tlvelm->tag);
 168                         if (AppDataName)
 169                                 JsonSaveStr(obj, "appdata", AppDataName);
 170                 } else {
 171                         char * name = emv_get_tag_name(tlvelm);
 172                         if (saveName && name && strlen(name) > 0 && strncmp(name, "Unknown", 7))
 173                                 JsonSaveStr(obj, "name", emv_get_tag_name(tlvelm));
 174                         JsonSaveHex(obj, "tag", tlvelm->tag, 0);
 175                         if (saveValue) {
 176                                 JsonSaveHex(obj, "length", tlvelm->len, 0);
 177                                 JsonSaveBufAsHex(obj, "value", (uint8_t *)tlvelm->value, tlvelm->len);
 178                         };
 179                 }
 180         }
 181
 182         return 0;
 183 }
 184
 185 int JsonSaveTLVTreeElm(json_t *elm, char *path, struct tlvdb *tlvdbelm, bool saveName, bool saveValue, bool saveAppDataLink) {
 186         return JsonSaveTLVElm(elm, path, (struct tlv *)tlvdb_get_tlv(tlvdbelm), saveName, saveValue, saveAppDataLink);
 187 }
 188
 189 int JsonSaveTLVTree(json_t *root, json_t *elm, char *path, struct tlvdb *tlvdbelm) {
 190         struct tlvdb *tlvp = tlvdbelm;
 191         while (tlvp) {
 192                 const struct tlv * tlvpelm = tlvdb_get_tlv(tlvp);
 193                 char * AppDataName = NULL;
 194                 if (tlvpelm)
 195                         AppDataName = GetApplicationDataName(tlvpelm->tag);
 196
 197                 if (AppDataName) {
 198                         char appdatalink[200] = {0};
 199                         sprintf(appdatalink, "$.ApplicationData.%s", AppDataName);
 200                         JsonSaveBufAsHex(root, appdatalink, (uint8_t *)tlvpelm->value, tlvpelm->len);
 201                 }
 202
 203                 json_t *pelm = json_path_get(elm, path);
 204                 if (pelm && json_is_array(pelm)) {
 205                         json_t *appendelm = json_object();
 206                         json_array_append_new(pelm, appendelm);
 207                         JsonSaveTLVTreeElm(appendelm, "$", tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName);
 208                         pelm = appendelm;
 209                 } else {
 210                         JsonSaveTLVTreeElm(elm, path, tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName);
 211                         pelm = json_path_get(elm, path);
 212                 }
 213
 214                 if (tlvdb_elm_get_children(tlvp)) {
 215                         // get path element
 216                         if(!pelm)
 217                                 return 1;
 218
 219                         // check childs element and add it if not found
 220                         json_t *chjson = json_path_get(pelm, "$.Childs");
 221                         if (!chjson) {
 222                                 json_object_set_new(pelm, "Childs", json_array());
 223
 224                                 chjson = json_path_get(pelm, "$.Childs");
 225                         }
 226
 227                         // check
 228                         if (!json_is_array(chjson)) {
 229                                 PrintAndLog("E->Internal logic error. `$.Childs` is not an array.");
 230                                 break;
 231                         }
 232
 233                         // Recursion
 234                         JsonSaveTLVTree(root, chjson, "$", tlvdb_elm_get_children(tlvp));
 235                 }
 236
 237                 tlvp = tlvdb_elm_get_next(tlvp);
 238         }
 239         return 0;
 240 }
 241
 242 bool HexToBuffer(const char *errormsg, const char *hexvalue, uint8_t * buffer, size_t maxbufferlen, size_t *bufferlen) {
 243         int buflen = 0;
 244
 245         switch(param_gethex_to_eol(hexvalue, 0, buffer, maxbufferlen, &buflen)) {
 246         case 1:
 247                 PrintAndLog("%s Invalid HEX value.", errormsg);
 248                 return false;
 249         case 2:
 250                 PrintAndLog("%s Hex value too large.", errormsg);
 251                 return false;
 252         case 3:
 253                 PrintAndLog("%s Hex value must have even number of digits.", errormsg);
 254                 return false;
 255         }
 256
 257         if (buflen > maxbufferlen) {
 258                 PrintAndLog("%s HEX length (%d) more than %d", errormsg, *bufferlen, maxbufferlen);
 259                 return false;
 260         }
 261
 262         *bufferlen = buflen;
 263
 264         return true;
 265 }
 266
 267 int JsonLoadStr(json_t *root, char *path, char *value) {
 268         if (!value)
 269                 return 1;
 270
 271         json_t *jelm = json_path_get((const json_t *)root, path);
 272         if (!jelm || !json_is_string(jelm))
 273                 return 2;
 274
 275         const char * strval = json_string_value(jelm);
 276         if (!strval)
 277                 return 1;
 278
 279         memcpy(value, strval, strlen(strval));
 280
 281         return 0;
 282 }
 283
 284 int JsonLoadBufAsHex(json_t *elm, char *path, uint8_t *data, size_t maxbufferlen, size_t *datalen) {
 285         if (datalen)
 286                 *datalen = 0;
 287
 288         json_t *jelm = json_path_get((const json_t *)elm, path);
 289         if (!jelm || !json_is_string(jelm))
 290                 return 1;
 291
 292         if (!HexToBuffer("ERROR load", json_string_value(jelm), data, maxbufferlen, datalen))
 293                 return 2;
 294
 295         return 0;
 296 };
 297
 298 bool ParamLoadFromJson(struct tlvdb *tlv) {
 299         json_t *root;
 300         json_error_t error;
 301
 302         if (!tlv) {
 303                 PrintAndLog("ERROR load params: tlv tree is NULL.");
 304                 return false;
 305         }
 306
 307         // current path + file name
 308         const char *relfname = "emv/defparams.json";
 309         char fname[strlen(get_my_executable_directory()) + strlen(relfname) + 1];
 310         strcpy(fname, get_my_executable_directory());
 311         strcat(fname, relfname);
 312
 313         root = json_load_file(fname, 0, &error);
 314         if (!root) {
 315                 PrintAndLog("Load params: json error on line %d: %s", error.line, error.text);
 316                 return false;
 317         }
 318
 319         if (!json_is_array(root)) {
 320                 PrintAndLog("Load params: Invalid json format. root must be array.");
 321                 return false;
 322         }
 323
 324         PrintAndLog("Load params: json(%d) OK", json_array_size(root));
 325
 326         for(int i = 0; i < json_array_size(root); i++) {
 327                 json_t *data, *jtag, *jlength, *jvalue;
 328
 329                 data = json_array_get(root, i);
 330                 if(!json_is_object(data))
 331                 {
 332                         PrintAndLog("Load params: data [%d] is not an object", i + 1);
 333                         json_decref(root);
 334                         return false;
 335                 }
 336
 337                 jtag = json_object_get(data, "tag");
 338                 if(!json_is_string(jtag))
 339                 {
 340                         PrintAndLog("Load params: data [%d] tag is not a string", i + 1);
 341                         json_decref(root);
 342                         return false;
 343                 }
 344                 const char *tlvTag = json_string_value(jtag);
 345
 346                 jvalue = json_object_get(data, "value");
 347                 if(!json_is_string(jvalue))
 348                 {
 349                         PrintAndLog("Load params: data [%d] value is not a string", i + 1);
 350                         json_decref(root);
 351                         return false;
 352                 }
 353                 const char *tlvValue = json_string_value(jvalue);
 354
 355                 jlength = json_object_get(data, "length");
 356                 if(!json_is_number(jlength))
 357                 {
 358                         PrintAndLog("Load params: data [%d] length is not a number", i + 1);
 359                         json_decref(root);
 360                         return false;
 361                 }
 362
 363                 int tlvLength = json_integer_value(jlength);
 364                 if (tlvLength > 250) {
 365                         PrintAndLog("Load params: data [%d] length more than 250", i + 1);
 366                         json_decref(root);
 367                         return false;
 368                 }
 369
 370                 PrintAndLog("TLV param: %s[%d]=%s", tlvTag, tlvLength, tlvValue);
 371                 uint8_t buf[251] = {0};
 372                 size_t buflen = 0;
 373
 374                 // here max length must be 4, but now tlv_tag_t is 2-byte var. so let it be 2 by now...  TODO: needs refactoring tlv_tag_t...
 375                 if (!HexToBuffer("TLV Error type:", tlvTag, buf, 2, &buflen)) {
 376                         json_decref(root);
 377                         return false;
 378                 }
 379                 tlv_tag_t tag = 0;
 380                 for (int i = 0; i < buflen; i++) {
 381                         tag = (tag << 8) + buf[i];
 382                 }
 383
 384                 if (!HexToBuffer("TLV Error value:", tlvValue, buf, sizeof(buf) - 1, &buflen)) {
 385                         json_decref(root);
 386                         return false;
 387                 }
 388
 389                 if (buflen != tlvLength) {
 390                         PrintAndLog("Load params: data [%d] length of HEX must(%d) be identical to length in TLV param(%d)", i + 1, buflen, tlvLength);
 391                         json_decref(root);
 392                         return false;
 393                 }
 394
 395                 tlvdb_change_or_add_node(tlv, tag, tlvLength, (const unsigned char *)buf);
 396         }
 397
 398         json_decref(root);
 399
 400         return true;
 401 }
 402