| 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 | // Tools for work with CBOR format http://cbor.io/spec.html |
| 9 | // via Intel tinycbor (https://github.com/intel/tinycbor) library |
| 10 | //----------------------------------------------------------------------------- |
| 11 | // |
| 12 | |
| 13 | #include "cbortools.h" |
| 14 | |
| 15 | #include <stdlib.h> |
| 16 | #include <inttypes.h> |
| 17 | |
| 18 | #include "emv/emvjson.h" |
| 19 | #include "util.h" |
| 20 | #include "fidocore.h" |
| 21 | |
| 22 | static void indent(int nestingLevel) { |
| 23 | while (nestingLevel--) |
| 24 | printf(" "); |
| 25 | } |
| 26 | |
| 27 | static CborError dumpelm(CborValue *it, bool *got_next, int nestingLevel) { |
| 28 | CborError err; |
| 29 | *got_next = false; |
| 30 | |
| 31 | CborType type = cbor_value_get_type(it); |
| 32 | indent(nestingLevel); |
| 33 | switch (type) { |
| 34 | case CborMapType: |
| 35 | case CborArrayType: { |
| 36 | printf(type == CborArrayType ? "Array[" : "Map["); |
| 37 | break; |
| 38 | } |
| 39 | |
| 40 | case CborIntegerType: { |
| 41 | int64_t val; |
| 42 | cbor_value_get_int64(it, &val); // can't fail |
| 43 | printf("%lld", (long long)val); |
| 44 | break; |
| 45 | } |
| 46 | |
| 47 | case CborByteStringType: { |
| 48 | uint8_t *buf; |
| 49 | size_t n; |
| 50 | err = cbor_value_dup_byte_string(it, &buf, &n, it); |
| 51 | *got_next = true; |
| 52 | if (err) |
| 53 | return err; // parse error |
| 54 | printf("%s", sprint_hex(buf, n)); |
| 55 | free(buf); |
| 56 | break; |
| 57 | } |
| 58 | |
| 59 | case CborTextStringType: { |
| 60 | char *buf; |
| 61 | size_t n; |
| 62 | err = cbor_value_dup_text_string(it, &buf, &n, it); |
| 63 | *got_next = true; |
| 64 | if (err) |
| 65 | return err; // parse error |
| 66 | printf("%s", buf); |
| 67 | free(buf); |
| 68 | break; |
| 69 | } |
| 70 | |
| 71 | case CborTagType: { |
| 72 | CborTag tag; |
| 73 | cbor_value_get_tag(it, &tag); |
| 74 | printf("Tag(%lld)", (long long)tag); |
| 75 | break; |
| 76 | } |
| 77 | |
| 78 | case CborSimpleType: { |
| 79 | uint8_t type; |
| 80 | cbor_value_get_simple_type(it, &type); |
| 81 | printf("simple(%u)", type); |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | case CborNullType: |
| 86 | printf("null"); |
| 87 | break; |
| 88 | |
| 89 | case CborUndefinedType: |
| 90 | printf("undefined"); |
| 91 | break; |
| 92 | |
| 93 | case CborBooleanType: { |
| 94 | bool val; |
| 95 | cbor_value_get_boolean(it, &val); // can't fail |
| 96 | printf("%s", val ? "true" : "false"); |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | case CborDoubleType: { |
| 101 | double val; |
| 102 | if (false) { |
| 103 | float f; |
| 104 | case CborFloatType: |
| 105 | cbor_value_get_float(it, &f); |
| 106 | val = f; |
| 107 | } else { |
| 108 | cbor_value_get_double(it, &val); |
| 109 | } |
| 110 | printf("%g", val); |
| 111 | break; |
| 112 | } |
| 113 | case CborHalfFloatType: { |
| 114 | uint16_t val; |
| 115 | cbor_value_get_half_float(it, &val); |
| 116 | printf("__f16(%04x)", val); |
| 117 | break; |
| 118 | } |
| 119 | |
| 120 | case CborInvalidType: |
| 121 | printf("CborInvalidType!!!"); |
| 122 | break; |
| 123 | } |
| 124 | |
| 125 | return CborNoError; |
| 126 | } |
| 127 | |
| 128 | static CborError dumprecursive(uint8_t cmdCode, bool isResponse, CborValue *it, bool isMapType, int nestingLevel) { |
| 129 | int elmCount = 0; |
| 130 | while (!cbor_value_at_end(it)) { |
| 131 | CborError err; |
| 132 | CborType type = cbor_value_get_type(it); |
| 133 | //printf("^%x^", type); |
| 134 | bool got_next; |
| 135 | |
| 136 | switch (type) { |
| 137 | case CborMapType: |
| 138 | case CborArrayType: { |
| 139 | // recursive type |
| 140 | CborValue recursed; |
| 141 | assert(cbor_value_is_container(it)); |
| 142 | if (!(isMapType && (elmCount % 2))) |
| 143 | indent(nestingLevel); |
| 144 | printf(type == CborArrayType ? "Array[\n" : "Map[\n"); |
| 145 | err = cbor_value_enter_container(it, &recursed); |
| 146 | if (err) |
| 147 | return err; // parse error |
| 148 | err = dumprecursive(cmdCode, isResponse, &recursed, (type == CborMapType), nestingLevel + 1); |
| 149 | if (err) |
| 150 | return err; // parse error |
| 151 | err = cbor_value_leave_container(it, &recursed); |
| 152 | if (err) |
| 153 | return err; // parse error |
| 154 | indent(nestingLevel); |
| 155 | printf("]"); |
| 156 | got_next = true; |
| 157 | break; |
| 158 | } |
| 159 | |
| 160 | default: { |
| 161 | err = dumpelm(it, &got_next, (isMapType && (elmCount % 2)) ? 0 : nestingLevel); |
| 162 | if (err) |
| 163 | return err; |
| 164 | if (cmdCode > 0 && nestingLevel == 1 && isMapType && !(elmCount % 2)) { |
| 165 | int64_t val; |
| 166 | cbor_value_get_int64(it, &val); |
| 167 | char *desc = fido2GetCmdMemberDescription(cmdCode, isResponse, val); |
| 168 | if (desc) |
| 169 | printf(" (%s)", desc); |
| 170 | } |
| 171 | break; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | if (!got_next) { |
| 176 | err = cbor_value_advance_fixed(it); |
| 177 | if (err) |
| 178 | return err; |
| 179 | } |
| 180 | if (isMapType && !(elmCount % 2)) { |
| 181 | printf(": "); |
| 182 | } else { |
| 183 | printf("\n"); |
| 184 | } |
| 185 | elmCount++; |
| 186 | } |
| 187 | return CborNoError; |
| 188 | } |
| 189 | |
| 190 | int TinyCborInit(uint8_t *data, size_t length, CborValue *cb) { |
| 191 | CborParser parser; |
| 192 | CborError err = cbor_parser_init(data, length, 0, &parser, cb); |
| 193 | if (err) |
| 194 | return err; |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | int TinyCborPrintFIDOPackage(uint8_t cmdCode, bool isResponse, uint8_t *data, size_t length) { |
| 200 | CborValue cb; |
| 201 | int res; |
| 202 | res = TinyCborInit(data, length, &cb); |
| 203 | if (res) |
| 204 | return res; |
| 205 | |
| 206 | CborError err = dumprecursive(cmdCode, isResponse, &cb, false, 0); |
| 207 | |
| 208 | if (err) { |
| 209 | fprintf(stderr, |
| 210 | #if __WORDSIZE == 64 |
| 211 | "CBOR parsing failure at offset %" PRId64 " : %s\n", |
| 212 | #else |
| 213 | "CBOR parsing failure at offset %" PRId32 " : %s\n", |
| 214 | #endif |
| 215 | cb.ptr - data, cbor_error_string(err)); |
| 216 | return 1; |
| 217 | } |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | int JsonObjElmCount(json_t *elm) { |
| 223 | int res = 0; |
| 224 | const char *key; |
| 225 | json_t *value; |
| 226 | |
| 227 | if (!json_is_object(elm)) |
| 228 | return 0; |
| 229 | |
| 230 | json_object_foreach(elm, key, value) { |
| 231 | if (strlen(key) > 0 && key[0] != '.') |
| 232 | res++; |
| 233 | } |
| 234 | |
| 235 | return res; |
| 236 | } |
| 237 | |
| 238 | int JsonToCbor(json_t *elm, CborEncoder *encoder) { |
| 239 | if (!elm || !encoder) |
| 240 | return 1; |
| 241 | |
| 242 | int res; |
| 243 | |
| 244 | // CBOR map == JSON object |
| 245 | if (json_is_object(elm)) { |
| 246 | CborEncoder map; |
| 247 | const char *key; |
| 248 | json_t *value; |
| 249 | |
| 250 | res = cbor_encoder_create_map(encoder, &map, JsonObjElmCount(elm)); |
| 251 | cbor_check(res); |
| 252 | |
| 253 | json_object_foreach(elm, key, value) { |
| 254 | if (strlen(key) > 0 && key[0] != '.') { |
| 255 | res = cbor_encode_text_stringz(&map, key); |
| 256 | cbor_check(res); |
| 257 | |
| 258 | // RECURSION! |
| 259 | JsonToCbor(value, &map); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | res = cbor_encoder_close_container(encoder, &map); |
| 264 | cbor_check(res); |
| 265 | } |
| 266 | |
| 267 | // CBOR array == JSON array |
| 268 | if (json_is_array(elm)) { |
| 269 | size_t index; |
| 270 | json_t *value; |
| 271 | CborEncoder array; |
| 272 | |
| 273 | res = cbor_encoder_create_array(encoder, &array, json_array_size(elm)); |
| 274 | cbor_check(res); |
| 275 | |
| 276 | json_array_foreach(elm, index, value) { |
| 277 | // RECURSION! |
| 278 | JsonToCbor(value, &array); |
| 279 | } |
| 280 | |
| 281 | res = cbor_encoder_close_container(encoder, &array); |
| 282 | cbor_check(res); |
| 283 | } |
| 284 | |
| 285 | if (json_is_boolean(elm)) { |
| 286 | res = cbor_encode_boolean(encoder, json_is_true(elm)); |
| 287 | cbor_check(res); |
| 288 | } |
| 289 | |
| 290 | if (json_is_integer(elm)) { |
| 291 | res = cbor_encode_int(encoder, json_integer_value(elm)); |
| 292 | cbor_check(res); |
| 293 | } |
| 294 | |
| 295 | if (json_is_real(elm)) { |
| 296 | res = cbor_encode_float(encoder, json_real_value(elm)); |
| 297 | cbor_check(res); |
| 298 | } |
| 299 | |
| 300 | if (json_is_string(elm)) { |
| 301 | const char * val = json_string_value(elm); |
| 302 | if (CheckStringIsHEXValue(val)) { |
| 303 | size_t datalen = 0; |
| 304 | uint8_t data[4096] = {0}; |
| 305 | res = JsonLoadBufAsHex(elm, "$", data, sizeof(data), &datalen); |
| 306 | if (res) |
| 307 | return 100; |
| 308 | |
| 309 | res = cbor_encode_byte_string(encoder, data, datalen); |
| 310 | cbor_check(res); |
| 311 | } else { |
| 312 | res = cbor_encode_text_stringz(encoder, val); |
| 313 | cbor_check(res); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | int CborMapGetKeyById(CborParser *parser, CborValue *map, uint8_t *data, size_t dataLen, int key) { |
| 323 | CborValue cb; |
| 324 | |
| 325 | CborError err = cbor_parser_init(data, dataLen, 0, parser, &cb); |
| 326 | cbor_check(err); |
| 327 | |
| 328 | if (cbor_value_get_type(&cb) != CborMapType) |
| 329 | return 1; |
| 330 | |
| 331 | err = cbor_value_enter_container(&cb, map); |
| 332 | cbor_check(err); |
| 333 | |
| 334 | int64_t indx; |
| 335 | while (!cbor_value_at_end(map)) { |
| 336 | // check number |
| 337 | if (cbor_value_get_type(map) != CborIntegerType) |
| 338 | return 1; |
| 339 | |
| 340 | cbor_value_get_int64(map, &indx); |
| 341 | |
| 342 | err = cbor_value_advance(map); |
| 343 | cbor_check(err); |
| 344 | |
| 345 | if (indx == key) |
| 346 | return 0; |
| 347 | |
| 348 | // pass value |
| 349 | err = cbor_value_advance(map); |
| 350 | cbor_check(err); |
| 351 | } |
| 352 | |
| 353 | err = cbor_value_leave_container(&cb, map); |
| 354 | cbor_check(err); |
| 355 | |
| 356 | return 2; |
| 357 | } |
| 358 | |
| 359 | CborError CborGetArrayBinStringValue(CborValue *elm, uint8_t *data, size_t maxdatalen, size_t *datalen) { |
| 360 | return CborGetArrayBinStringValueEx(elm, data, maxdatalen, datalen, NULL, 0); |
| 361 | } |
| 362 | |
| 363 | CborError CborGetArrayBinStringValueEx(CborValue *elm, uint8_t *data, size_t maxdatalen, size_t *datalen, uint8_t *delimeter, size_t delimeterlen) { |
| 364 | CborValue array; |
| 365 | if (datalen) |
| 366 | *datalen = 0; |
| 367 | |
| 368 | size_t slen = maxdatalen; |
| 369 | size_t totallen = 0; |
| 370 | |
| 371 | CborError res = cbor_value_enter_container(elm, &array); |
| 372 | cbor_check(res); |
| 373 | |
| 374 | while (!cbor_value_at_end(&array)) { |
| 375 | res = cbor_value_copy_byte_string(&array, &data[totallen], &slen, &array); |
| 376 | cbor_check(res); |
| 377 | |
| 378 | totallen += slen; |
| 379 | if (delimeter) { |
| 380 | memcpy(&data[totallen], delimeter, delimeterlen); |
| 381 | totallen += delimeterlen; |
| 382 | } |
| 383 | slen = maxdatalen - totallen; |
| 384 | } |
| 385 | |
| 386 | res = cbor_value_leave_container(elm, &array); |
| 387 | cbor_check(res); |
| 388 | |
| 389 | if (datalen) |
| 390 | *datalen = totallen; |
| 391 | |
| 392 | return CborNoError; |
| 393 | }; |
| 394 | |
| 395 | CborError CborGetBinStringValue(CborValue *elm, uint8_t *data, size_t maxdatalen, size_t *datalen) { |
| 396 | if (datalen) |
| 397 | *datalen = 0; |
| 398 | |
| 399 | size_t slen = maxdatalen; |
| 400 | |
| 401 | CborError res = cbor_value_copy_byte_string(elm, data, &slen, elm); |
| 402 | cbor_check(res); |
| 403 | |
| 404 | if (datalen) |
| 405 | *datalen = slen; |
| 406 | |
| 407 | return CborNoError; |
| 408 | }; |
| 409 | |
| 410 | CborError CborGetArrayStringValue(CborValue *elm, char *data, size_t maxdatalen, size_t *datalen, char *delimeter) { |
| 411 | CborValue array; |
| 412 | if (datalen) |
| 413 | *datalen = 0; |
| 414 | |
| 415 | size_t slen = maxdatalen; |
| 416 | size_t totallen = 0; |
| 417 | |
| 418 | CborError res = cbor_value_enter_container(elm, &array); |
| 419 | cbor_check(res); |
| 420 | |
| 421 | while (!cbor_value_at_end(&array)) { |
| 422 | res = cbor_value_copy_text_string(&array, &data[totallen], &slen, &array); |
| 423 | cbor_check(res); |
| 424 | |
| 425 | totallen += slen; |
| 426 | if (delimeter) { |
| 427 | strcat(data, delimeter); |
| 428 | totallen += strlen(delimeter); |
| 429 | } |
| 430 | slen = maxdatalen - totallen; |
| 431 | data[totallen] = 0x00; |
| 432 | } |
| 433 | |
| 434 | res = cbor_value_leave_container(elm, &array); |
| 435 | cbor_check(res); |
| 436 | |
| 437 | if (datalen) |
| 438 | *datalen = totallen; |
| 439 | |
| 440 | return CborNoError; |
| 441 | }; |
| 442 | |
| 443 | CborError CborGetStringValue(CborValue *elm, char *data, size_t maxdatalen, size_t *datalen) { |
| 444 | if (datalen) |
| 445 | *datalen = 0; |
| 446 | |
| 447 | size_t slen = maxdatalen; |
| 448 | |
| 449 | CborError res = cbor_value_copy_text_string(elm, data, &slen, elm); |
| 450 | cbor_check(res); |
| 451 | |
| 452 | if (datalen) |
| 453 | *datalen = slen; |
| 454 | |
| 455 | return CborNoError; |
| 456 | }; |
| 457 | |
| 458 | CborError CborGetStringValueBuf(CborValue *elm) { |
| 459 | static char stringBuf[2048]; |
| 460 | memset(stringBuf, 0x00, sizeof(stringBuf)); |
| 461 | |
| 462 | return CborGetStringValue(elm, stringBuf, sizeof(stringBuf), NULL); |
| 463 | }; |
| 464 | |
| 465 | int CBOREncodeElm(json_t *root, char *rootElmId, CborEncoder *encoder) { |
| 466 | json_t *elm = NULL; |
| 467 | if (rootElmId && strlen(rootElmId) && rootElmId[0] == '$') |
| 468 | elm = json_path_get(root, rootElmId); |
| 469 | else |
| 470 | elm = json_object_get(root, rootElmId); |
| 471 | |
| 472 | if (!elm) |
| 473 | return 1; |
| 474 | |
| 475 | int res = JsonToCbor(elm, encoder); |
| 476 | |
| 477 | return res; |
| 478 | } |
| 479 | |
| 480 | CborError CBOREncodeClientDataHash(json_t *root, CborEncoder *encoder) { |
| 481 | uint8_t buf[100] = {0}; |
| 482 | size_t jlen; |
| 483 | |
| 484 | JsonLoadBufAsHex(root, "$.ClientDataHash", buf, sizeof(buf), &jlen); |
| 485 | |
| 486 | // fill with 0x00 if not found |
| 487 | if (!jlen) |
| 488 | jlen = 32; |
| 489 | |
| 490 | int res = cbor_encode_byte_string(encoder, buf, jlen); |
| 491 | cbor_check(res); |
| 492 | |
| 493 | return 0; |
| 494 | } |