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 JsonSaveStr(json_t *root, char *path, char *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, json_string(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, json_string(value));
  86         }
  87 };
  88
  89 int JsonSaveBufAsHex(json_t *elm, char *path, uint8_t *data, size_t datalen) {
  90         char * msg = sprint_hex(data, datalen);
  91         if (msg && strlen(msg) && msg[strlen(msg) - 1] == ' ')
  92                 msg[strlen(msg) - 1] = '\0';
  93
  94         return JsonSaveStr(elm, path, msg);
  95 }
  96
  97 int JsonSaveHex(json_t *elm, char *path, uint64_t data, int datalen) {
  98         uint8_t bdata[8] = {0};
  99         int len = 0;
 100         if (!datalen) {
 101                 for (uint64_t u = 0xffffffffffffffff; u; u = u << 8) {
 102                         if (!(data & u)) {
 103                                 break;
 104                         }
 105                         len++;
 106                 }
 107                 if (!len)
 108                         len = 1;
 109         } else {
 110                 len = datalen;
 111         }
 112         num_to_bytes(data, len, bdata);
 113
 114         return JsonSaveBufAsHex(elm, path, bdata, len);
 115 }
 116
 117 int JsonSaveTLVValue(json_t *root, char *path, struct tlvdb *tlvdbelm) {
 118         const struct tlv *tlvelm = tlvdb_get_tlv(tlvdbelm);
 119         if (tlvelm)
 120                 return JsonSaveBufAsHex(root, path, (uint8_t *)tlvelm->value, tlvelm->len);
 121         else
 122                 return 1;
 123 }
 124
 125 int JsonSaveTLVElm(json_t *elm, char *path, struct tlv *tlvelm, bool saveName, bool saveValue, bool saveAppDataLink) {
 126         json_error_t error;
 127
 128         if (strlen(path) < 1 || !tlvelm)
 129                 return 1;
 130
 131         if (path[0] == '$') {
 132
 133                 json_t *obj = json_path_get(elm, path);
 134                 if (!obj) {
 135                         obj = json_object();
 136
 137                         if (json_is_array(elm)) {
 138                                 if (json_array_append_new(elm, obj)) {
 139                                         PrintAndLog("ERROR: can't append array: %s", path);
 140                                         return 2;
 141                                 }
 142                         } else {
 143                                 if (json_path_set(elm, path, obj, 0, &error)) {
 144                                         PrintAndLog("ERROR: can't set json path: ", error.text);
 145                                         return 2;
 146                                 }
 147                         }
 148                 }
 149
 150                 if (saveAppDataLink) {
 151                         char * AppDataName = GetApplicationDataName(tlvelm->tag);
 152                         if (AppDataName)
 153                                 JsonSaveStr(obj, "appdata", AppDataName);
 154                 } else {
 155                         char * name = emv_get_tag_name(tlvelm);
 156                         if (saveName && name && strlen(name) > 0 && strncmp(name, "Unknown", 7))
 157                                 JsonSaveStr(obj, "name", emv_get_tag_name(tlvelm));
 158                         JsonSaveHex(obj, "tag", tlvelm->tag, 0);
 159                         if (saveValue) {
 160                                 JsonSaveHex(obj, "length", tlvelm->len, 0);
 161                                 JsonSaveBufAsHex(obj, "value", (uint8_t *)tlvelm->value, tlvelm->len);
 162                         };
 163                 }
 164         }
 165
 166         return 0;
 167 }
 168
 169 int JsonSaveTLVTreeElm(json_t *elm, char *path, struct tlvdb *tlvdbelm, bool saveName, bool saveValue, bool saveAppDataLink) {
 170         return JsonSaveTLVElm(elm, path, (struct tlv *)tlvdb_get_tlv(tlvdbelm), saveName, saveValue, saveAppDataLink);
 171 }
 172
 173 int JsonSaveTLVTree(json_t *root, json_t *elm, char *path, struct tlvdb *tlvdbelm) {
 174         struct tlvdb *tlvp = tlvdbelm;
 175         while (tlvp) {
 176                 const struct tlv * tlvpelm = tlvdb_get_tlv(tlvp);
 177                 char * AppDataName = NULL;
 178                 if (tlvpelm)
 179                         AppDataName = GetApplicationDataName(tlvpelm->tag);
 180
 181                 if (AppDataName) {
 182                         char appdatalink[200] = {0};
 183                         sprintf(appdatalink, "$.ApplicationData.%s", AppDataName);
 184                         JsonSaveBufAsHex(root, appdatalink, (uint8_t *)tlvpelm->value, tlvpelm->len);
 185                 }
 186
 187                 json_t *pelm = json_path_get(elm, path);
 188                 if (pelm && json_is_array(pelm)) {
 189                         json_t *appendelm = json_object();
 190                         json_array_append_new(pelm, appendelm);
 191                         JsonSaveTLVTreeElm(appendelm, "$", tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName);
 192                         pelm = appendelm;
 193                 } else {
 194                         JsonSaveTLVTreeElm(elm, path, tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName);
 195                         pelm = json_path_get(elm, path);
 196                 }
 197
 198                 if (tlvdb_elm_get_children(tlvp)) {
 199                         // get path element
 200                         if(!pelm)
 201                                 return 1;
 202
 203                         // check childs element and add it if not found
 204                         json_t *chjson = json_path_get(pelm, "$.Childs");
 205                         if (!chjson) {
 206                                 json_object_set_new(pelm, "Childs", json_array());
 207
 208                                 chjson = json_path_get(pelm, "$.Childs");
 209                         }
 210
 211                         // check
 212                         if (!json_is_array(chjson)) {
 213                                 PrintAndLog("E->Internal logic error. `$.Childs` is not an array.");
 214                                 break;
 215                         }
 216
 217                         // Recursion
 218                         JsonSaveTLVTree(root, chjson, "$", tlvdb_elm_get_children(tlvp));
 219                 }
 220
 221                 tlvp = tlvdb_elm_get_next(tlvp);
 222         }
 223         return 0;
 224 }
 225
 226 bool HexToBuffer(const char *errormsg, const char *hexvalue, uint8_t * buffer, size_t maxbufferlen, size_t *bufferlen) {
 227         int buflen = 0;
 228
 229         switch(param_gethex_to_eol(hexvalue, 0, buffer, maxbufferlen, &buflen)) {
 230         case 1:
 231                 PrintAndLog("%s Invalid HEX value.", errormsg);
 232                 return false;
 233         case 2:
 234                 PrintAndLog("%s Hex value too large.", errormsg);
 235                 return false;
 236         case 3:
 237                 PrintAndLog("%s Hex value must have even number of digits.", errormsg);
 238                 return false;
 239         }
 240
 241         if (buflen > maxbufferlen) {
 242                 PrintAndLog("%s HEX length (%d) more than %d", errormsg, *bufferlen, maxbufferlen);
 243                 return false;
 244         }
 245
 246         *bufferlen = buflen;
 247
 248         return true;
 249 }
 250
 251 bool ParamLoadFromJson(struct tlvdb *tlv) {
 252         json_t *root;
 253         json_error_t error;
 254
 255         if (!tlv) {
 256                 PrintAndLog("ERROR load params: tlv tree is NULL.");
 257                 return false;
 258         }
 259
 260         // current path + file name
 261         const char *relfname = "emv/defparams.json";
 262         char fname[strlen(get_my_executable_directory()) + strlen(relfname) + 1];
 263         strcpy(fname, get_my_executable_directory());
 264         strcat(fname, relfname);
 265
 266         root = json_load_file(fname, 0, &error);
 267         if (!root) {
 268                 PrintAndLog("Load params: json error on line %d: %s", error.line, error.text);
 269                 return false;
 270         }
 271
 272         if (!json_is_array(root)) {
 273                 PrintAndLog("Load params: Invalid json format. root must be array.");
 274                 return false;
 275         }
 276
 277         PrintAndLog("Load params: json(%d) OK", json_array_size(root));
 278
 279         for(int i = 0; i < json_array_size(root); i++) {
 280                 json_t *data, *jtag, *jlength, *jvalue;
 281
 282                 data = json_array_get(root, i);
 283                 if(!json_is_object(data))
 284                 {
 285                         PrintAndLog("Load params: data [%d] is not an object", i + 1);
 286                         json_decref(root);
 287                         return false;
 288                 }
 289
 290                 jtag = json_object_get(data, "tag");
 291                 if(!json_is_string(jtag))
 292                 {
 293                         PrintAndLog("Load params: data [%d] tag is not a string", i + 1);
 294                         json_decref(root);
 295                         return false;
 296                 }
 297                 const char *tlvTag = json_string_value(jtag);
 298
 299                 jvalue = json_object_get(data, "value");
 300                 if(!json_is_string(jvalue))
 301                 {
 302                         PrintAndLog("Load params: data [%d] value is not a string", i + 1);
 303                         json_decref(root);
 304                         return false;
 305                 }
 306                 const char *tlvValue = json_string_value(jvalue);
 307
 308                 jlength = json_object_get(data, "length");
 309                 if(!json_is_number(jlength))
 310                 {
 311                         PrintAndLog("Load params: data [%d] length is not a number", i + 1);
 312                         json_decref(root);
 313                         return false;
 314                 }
 315
 316                 int tlvLength = json_integer_value(jlength);
 317                 if (tlvLength > 250) {
 318                         PrintAndLog("Load params: data [%d] length more than 250", i + 1);
 319                         json_decref(root);
 320                         return false;
 321                 }
 322
 323                 PrintAndLog("TLV param: %s[%d]=%s", tlvTag, tlvLength, tlvValue);
 324                 uint8_t buf[251] = {0};
 325                 size_t buflen = 0;
 326
 327                 // 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...
 328                 if (!HexToBuffer("TLV Error type:", tlvTag, buf, 2, &buflen)) {
 329                         json_decref(root);
 330                         return false;
 331                 }
 332                 tlv_tag_t tag = 0;
 333                 for (int i = 0; i < buflen; i++) {
 334                         tag = (tag << 8) + buf[i];
 335                 }
 336
 337                 if (!HexToBuffer("TLV Error value:", tlvValue, buf, sizeof(buf) - 1, &buflen)) {
 338                         json_decref(root);
 339                         return false;
 340                 }
 341
 342                 if (buflen != tlvLength) {
 343                         PrintAndLog("Load params: data [%d] length of HEX must(%d) be identical to length in TLV param(%d)", i + 1, buflen, tlvLength);
 344                         json_decref(root);
 345                         return false;
 346                 }
 347
 348                 tlvdb_change_or_add_node(tlv, tag, tlvLength, (const unsigned char *)buf);
 349         }
 350
 351         json_decref(root);
 352
 353         return true;
 354 }
 355