1 /* 2 * EAP peer method: EAP-FAST PAC file processing 3 * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "eap_config.h" 13 #include "eap_i.h" 14 #include "eap_fast_pac.h" 15 16 /* TODO: encrypt PAC-Key in the PAC file */ 17 18 19 /* Text data format */ 20 static const char *pac_file_hdr = 21 "wpa_supplicant EAP-FAST PAC file - version 1"; 22 23 /* 24 * Binary data format 25 * 4-octet magic value: 6A E4 92 0C 26 * 2-octet version (big endian) 27 * <version specific data> 28 * 29 * version=0: 30 * Sequence of PAC entries: 31 * 2-octet PAC-Type (big endian) 32 * 32-octet PAC-Key 33 * 2-octet PAC-Opaque length (big endian) 34 * <variable len> PAC-Opaque data (length bytes) 35 * 2-octet PAC-Info length (big endian) 36 * <variable len> PAC-Info data (length bytes) 37 */ 38 39 #define EAP_FAST_PAC_BINARY_MAGIC 0x6ae4920c 40 #define EAP_FAST_PAC_BINARY_FORMAT_VERSION 0 41 42 43 /** 44 * eap_fast_free_pac - Free PAC data 45 * @pac: Pointer to the PAC entry 46 * 47 * Note that the PAC entry must not be in a list since this function does not 48 * remove the list links. 49 */ 50 void eap_fast_free_pac(struct eap_fast_pac *pac) 51 { 52 os_free(pac->pac_opaque); 53 os_free(pac->pac_info); 54 os_free(pac->a_id); 55 os_free(pac->i_id); 56 os_free(pac->a_id_info); 57 os_free(pac); 58 } 59 60 61 /** 62 * eap_fast_get_pac - Get a PAC entry based on A-ID 63 * @pac_root: Pointer to root of the PAC list 64 * @a_id: A-ID to search for 65 * @a_id_len: Length of A-ID 66 * @pac_type: PAC-Type to search for 67 * Returns: Pointer to the PAC entry, or %NULL if A-ID not found 68 */ 69 struct eap_fast_pac * eap_fast_get_pac(struct eap_fast_pac *pac_root, 70 const u8 *a_id, size_t a_id_len, 71 u16 pac_type) 72 { 73 struct eap_fast_pac *pac = pac_root; 74 75 while (pac) { 76 if (pac->pac_type == pac_type && pac->a_id_len == a_id_len && 77 os_memcmp(pac->a_id, a_id, a_id_len) == 0) { 78 return pac; 79 } 80 pac = pac->next; 81 } 82 return NULL; 83 } 84 85 86 static void eap_fast_remove_pac(struct eap_fast_pac **pac_root, 87 struct eap_fast_pac **pac_current, 88 const u8 *a_id, size_t a_id_len, u16 pac_type) 89 { 90 struct eap_fast_pac *pac, *prev; 91 92 pac = *pac_root; 93 prev = NULL; 94 95 while (pac) { 96 if (pac->pac_type == pac_type && pac->a_id_len == a_id_len && 97 os_memcmp(pac->a_id, a_id, a_id_len) == 0) { 98 if (prev == NULL) 99 *pac_root = pac->next; 100 else 101 prev->next = pac->next; 102 if (*pac_current == pac) 103 *pac_current = NULL; 104 eap_fast_free_pac(pac); 105 break; 106 } 107 prev = pac; 108 pac = pac->next; 109 } 110 } 111 112 113 static int eap_fast_copy_buf(u8 **dst, size_t *dst_len, 114 const u8 *src, size_t src_len) 115 { 116 if (src) { 117 *dst = os_malloc(src_len); 118 if (*dst == NULL) 119 return -1; 120 os_memcpy(*dst, src, src_len); 121 *dst_len = src_len; 122 } 123 return 0; 124 } 125 126 127 /** 128 * eap_fast_add_pac - Add a copy of a PAC entry to a list 129 * @pac_root: Pointer to PAC list root pointer 130 * @pac_current: Pointer to the current PAC pointer 131 * @entry: New entry to clone and add to the list 132 * Returns: 0 on success, -1 on failure 133 * 134 * This function makes a clone of the given PAC entry and adds this copied 135 * entry to the list (pac_root). If an old entry for the same A-ID is found, 136 * it will be removed from the PAC list and in this case, pac_current entry 137 * is set to %NULL if it was the removed entry. 138 */ 139 int eap_fast_add_pac(struct eap_fast_pac **pac_root, 140 struct eap_fast_pac **pac_current, 141 struct eap_fast_pac *entry) 142 { 143 struct eap_fast_pac *pac; 144 145 if (entry == NULL || entry->a_id == NULL) 146 return -1; 147 148 /* Remove a possible old entry for the matching A-ID. */ 149 eap_fast_remove_pac(pac_root, pac_current, 150 entry->a_id, entry->a_id_len, entry->pac_type); 151 152 /* Allocate a new entry and add it to the list of PACs. */ 153 pac = os_zalloc(sizeof(*pac)); 154 if (pac == NULL) 155 return -1; 156 157 pac->pac_type = entry->pac_type; 158 os_memcpy(pac->pac_key, entry->pac_key, EAP_FAST_PAC_KEY_LEN); 159 if (eap_fast_copy_buf(&pac->pac_opaque, &pac->pac_opaque_len, 160 entry->pac_opaque, entry->pac_opaque_len) < 0 || 161 eap_fast_copy_buf(&pac->pac_info, &pac->pac_info_len, 162 entry->pac_info, entry->pac_info_len) < 0 || 163 eap_fast_copy_buf(&pac->a_id, &pac->a_id_len, 164 entry->a_id, entry->a_id_len) < 0 || 165 eap_fast_copy_buf(&pac->i_id, &pac->i_id_len, 166 entry->i_id, entry->i_id_len) < 0 || 167 eap_fast_copy_buf(&pac->a_id_info, &pac->a_id_info_len, 168 entry->a_id_info, entry->a_id_info_len) < 0) { 169 eap_fast_free_pac(pac); 170 return -1; 171 } 172 173 pac->next = *pac_root; 174 *pac_root = pac; 175 176 return 0; 177 } 178 179 180 struct eap_fast_read_ctx { 181 FILE *f; 182 const char *pos; 183 const char *end; 184 int line; 185 char *buf; 186 size_t buf_len; 187 }; 188 189 static int eap_fast_read_line(struct eap_fast_read_ctx *rc, char **value) 190 { 191 char *pos; 192 193 rc->line++; 194 if (rc->f) { 195 if (fgets(rc->buf, rc->buf_len, rc->f) == NULL) 196 return -1; 197 } else { 198 const char *l_end; 199 size_t len; 200 if (rc->pos >= rc->end) 201 return -1; 202 l_end = rc->pos; 203 while (l_end < rc->end && *l_end != '\n') 204 l_end++; 205 len = l_end - rc->pos; 206 if (len >= rc->buf_len) 207 len = rc->buf_len - 1; 208 os_memcpy(rc->buf, rc->pos, len); 209 rc->buf[len] = '\0'; 210 rc->pos = l_end + 1; 211 } 212 213 rc->buf[rc->buf_len - 1] = '\0'; 214 pos = rc->buf; 215 while (*pos != '\0') { 216 if (*pos == '\n' || *pos == '\r') { 217 *pos = '\0'; 218 break; 219 } 220 pos++; 221 } 222 223 pos = os_strchr(rc->buf, '='); 224 if (pos) 225 *pos++ = '\0'; 226 *value = pos; 227 228 return 0; 229 } 230 231 232 static u8 * eap_fast_parse_hex(const char *value, size_t *len) 233 { 234 int hlen; 235 u8 *buf; 236 237 if (value == NULL) 238 return NULL; 239 hlen = os_strlen(value); 240 if (hlen & 1) 241 return NULL; 242 *len = hlen / 2; 243 buf = os_malloc(*len); 244 if (buf == NULL) 245 return NULL; 246 if (hexstr2bin(value, buf, *len)) { 247 os_free(buf); 248 return NULL; 249 } 250 return buf; 251 } 252 253 254 static int eap_fast_init_pac_data(struct eap_sm *sm, const char *pac_file, 255 struct eap_fast_read_ctx *rc) 256 { 257 os_memset(rc, 0, sizeof(*rc)); 258 259 rc->buf_len = 2048; 260 rc->buf = os_malloc(rc->buf_len); 261 if (rc->buf == NULL) 262 return -1; 263 264 if (os_strncmp(pac_file, "blob://", 7) == 0) { 265 const struct wpa_config_blob *blob; 266 blob = eap_get_config_blob(sm, pac_file + 7); 267 if (blob == NULL) { 268 wpa_printf(MSG_INFO, "EAP-FAST: No PAC blob '%s' - " 269 "assume no PAC entries have been " 270 "provisioned", pac_file + 7); 271 os_free(rc->buf); 272 return -1; 273 } 274 rc->pos = (char *) blob->data; 275 rc->end = (char *) blob->data + blob->len; 276 } else { 277 rc->f = fopen(pac_file, "rb"); 278 if (rc->f == NULL) { 279 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file '%s' - " 280 "assume no PAC entries have been " 281 "provisioned", pac_file); 282 os_free(rc->buf); 283 return -1; 284 } 285 } 286 287 return 0; 288 } 289 290 291 static void eap_fast_deinit_pac_data(struct eap_fast_read_ctx *rc) 292 { 293 os_free(rc->buf); 294 if (rc->f) 295 fclose(rc->f); 296 } 297 298 299 static const char * eap_fast_parse_start(struct eap_fast_pac **pac) 300 { 301 if (*pac) 302 return "START line without END"; 303 304 *pac = os_zalloc(sizeof(struct eap_fast_pac)); 305 if (*pac == NULL) 306 return "No memory for PAC entry"; 307 (*pac)->pac_type = PAC_TYPE_TUNNEL_PAC; 308 return NULL; 309 } 310 311 312 static const char * eap_fast_parse_end(struct eap_fast_pac **pac_root, 313 struct eap_fast_pac **pac) 314 { 315 if (*pac == NULL) 316 return "END line without START"; 317 if (*pac_root) { 318 struct eap_fast_pac *end = *pac_root; 319 while (end->next) 320 end = end->next; 321 end->next = *pac; 322 } else 323 *pac_root = *pac; 324 325 *pac = NULL; 326 return NULL; 327 } 328 329 330 static const char * eap_fast_parse_pac_type(struct eap_fast_pac *pac, 331 char *pos) 332 { 333 if (!pos) 334 return "Cannot parse pac type"; 335 pac->pac_type = atoi(pos); 336 if (pac->pac_type != PAC_TYPE_TUNNEL_PAC && 337 pac->pac_type != PAC_TYPE_USER_AUTHORIZATION && 338 pac->pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) 339 return "Unrecognized PAC-Type"; 340 341 return NULL; 342 } 343 344 345 static const char * eap_fast_parse_pac_key(struct eap_fast_pac *pac, char *pos) 346 { 347 u8 *key; 348 size_t key_len; 349 350 key = eap_fast_parse_hex(pos, &key_len); 351 if (key == NULL || key_len != EAP_FAST_PAC_KEY_LEN) { 352 os_free(key); 353 return "Invalid PAC-Key"; 354 } 355 356 os_memcpy(pac->pac_key, key, EAP_FAST_PAC_KEY_LEN); 357 os_free(key); 358 359 return NULL; 360 } 361 362 363 static const char * eap_fast_parse_pac_opaque(struct eap_fast_pac *pac, 364 char *pos) 365 { 366 os_free(pac->pac_opaque); 367 pac->pac_opaque = eap_fast_parse_hex(pos, &pac->pac_opaque_len); 368 if (pac->pac_opaque == NULL) 369 return "Invalid PAC-Opaque"; 370 return NULL; 371 } 372 373 374 static const char * eap_fast_parse_a_id(struct eap_fast_pac *pac, char *pos) 375 { 376 os_free(pac->a_id); 377 pac->a_id = eap_fast_parse_hex(pos, &pac->a_id_len); 378 if (pac->a_id == NULL) 379 return "Invalid A-ID"; 380 return NULL; 381 } 382 383 384 static const char * eap_fast_parse_i_id(struct eap_fast_pac *pac, char *pos) 385 { 386 os_free(pac->i_id); 387 pac->i_id = eap_fast_parse_hex(pos, &pac->i_id_len); 388 if (pac->i_id == NULL) 389 return "Invalid I-ID"; 390 return NULL; 391 } 392 393 394 static const char * eap_fast_parse_a_id_info(struct eap_fast_pac *pac, 395 char *pos) 396 { 397 os_free(pac->a_id_info); 398 pac->a_id_info = eap_fast_parse_hex(pos, &pac->a_id_info_len); 399 if (pac->a_id_info == NULL) 400 return "Invalid A-ID-Info"; 401 return NULL; 402 } 403 404 405 /** 406 * eap_fast_load_pac - Load PAC entries (text format) 407 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 408 * @pac_root: Pointer to root of the PAC list (to be filled) 409 * @pac_file: Name of the PAC file/blob to load 410 * Returns: 0 on success, -1 on failure 411 */ 412 int eap_fast_load_pac(struct eap_sm *sm, struct eap_fast_pac **pac_root, 413 const char *pac_file) 414 { 415 struct eap_fast_read_ctx rc; 416 struct eap_fast_pac *pac = NULL; 417 int count = 0; 418 char *pos; 419 const char *err = NULL; 420 421 if (pac_file == NULL) 422 return -1; 423 424 if (eap_fast_init_pac_data(sm, pac_file, &rc) < 0) 425 return 0; 426 427 if (eap_fast_read_line(&rc, &pos) < 0) { 428 /* empty file - assume it is fine to overwrite */ 429 eap_fast_deinit_pac_data(&rc); 430 return 0; 431 } 432 if (os_strcmp(pac_file_hdr, rc.buf) != 0) 433 err = "Unrecognized header line"; 434 435 while (!err && eap_fast_read_line(&rc, &pos) == 0) { 436 if (os_strcmp(rc.buf, "START") == 0) 437 err = eap_fast_parse_start(&pac); 438 else if (os_strcmp(rc.buf, "END") == 0) { 439 err = eap_fast_parse_end(pac_root, &pac); 440 count++; 441 } else if (!pac) 442 err = "Unexpected line outside START/END block"; 443 else if (os_strcmp(rc.buf, "PAC-Type") == 0) 444 err = eap_fast_parse_pac_type(pac, pos); 445 else if (os_strcmp(rc.buf, "PAC-Key") == 0) 446 err = eap_fast_parse_pac_key(pac, pos); 447 else if (os_strcmp(rc.buf, "PAC-Opaque") == 0) 448 err = eap_fast_parse_pac_opaque(pac, pos); 449 else if (os_strcmp(rc.buf, "A-ID") == 0) 450 err = eap_fast_parse_a_id(pac, pos); 451 else if (os_strcmp(rc.buf, "I-ID") == 0) 452 err = eap_fast_parse_i_id(pac, pos); 453 else if (os_strcmp(rc.buf, "A-ID-Info") == 0) 454 err = eap_fast_parse_a_id_info(pac, pos); 455 } 456 457 if (pac) { 458 err = "PAC block not terminated with END"; 459 eap_fast_free_pac(pac); 460 } 461 462 eap_fast_deinit_pac_data(&rc); 463 464 if (err) { 465 wpa_printf(MSG_INFO, "EAP-FAST: %s in '%s:%d'", 466 err, pac_file, rc.line); 467 return -1; 468 } 469 470 wpa_printf(MSG_DEBUG, "EAP-FAST: Read %d PAC entries from '%s'", 471 count, pac_file); 472 473 return 0; 474 } 475 476 477 static void eap_fast_write(char **buf, char **pos, size_t *buf_len, 478 const char *field, const u8 *data, 479 size_t len, int txt) 480 { 481 size_t i, need; 482 int ret; 483 char *end; 484 485 if (data == NULL || buf == NULL || *buf == NULL || 486 pos == NULL || *pos == NULL || *pos < *buf) 487 return; 488 489 need = os_strlen(field) + len * 2 + 30; 490 if (txt) 491 need += os_strlen(field) + len + 20; 492 493 if (*pos - *buf + need > *buf_len) { 494 char *nbuf = os_realloc(*buf, *buf_len + need); 495 if (nbuf == NULL) { 496 os_free(*buf); 497 *buf = NULL; 498 return; 499 } 500 *pos = nbuf + (*pos - *buf); 501 *buf = nbuf; 502 *buf_len += need; 503 } 504 end = *buf + *buf_len; 505 506 ret = os_snprintf(*pos, end - *pos, "%s=", field); 507 if (os_snprintf_error(end - *pos, ret)) 508 return; 509 *pos += ret; 510 *pos += wpa_snprintf_hex(*pos, end - *pos, data, len); 511 ret = os_snprintf(*pos, end - *pos, "\n"); 512 if (os_snprintf_error(end - *pos, ret)) 513 return; 514 *pos += ret; 515 516 if (txt) { 517 ret = os_snprintf(*pos, end - *pos, "%s-txt=", field); 518 if (os_snprintf_error(end - *pos, ret)) 519 return; 520 *pos += ret; 521 for (i = 0; i < len; i++) { 522 ret = os_snprintf(*pos, end - *pos, "%c", data[i]); 523 if (os_snprintf_error(end - *pos, ret)) 524 return; 525 *pos += ret; 526 } 527 ret = os_snprintf(*pos, end - *pos, "\n"); 528 if (os_snprintf_error(end - *pos, ret)) 529 return; 530 *pos += ret; 531 } 532 } 533 534 535 static int eap_fast_write_pac(struct eap_sm *sm, const char *pac_file, 536 char *buf, size_t len) 537 { 538 if (os_strncmp(pac_file, "blob://", 7) == 0) { 539 struct wpa_config_blob *blob; 540 blob = os_zalloc(sizeof(*blob)); 541 if (blob == NULL) 542 return -1; 543 blob->data = (u8 *) buf; 544 blob->len = len; 545 buf = NULL; 546 blob->name = os_strdup(pac_file + 7); 547 if (blob->name == NULL) { 548 os_free(blob); 549 return -1; 550 } 551 eap_set_config_blob(sm, blob); 552 } else { 553 FILE *f; 554 f = fopen(pac_file, "wb"); 555 if (f == NULL) { 556 wpa_printf(MSG_INFO, "EAP-FAST: Failed to open PAC " 557 "file '%s' for writing", pac_file); 558 return -1; 559 } 560 if (fwrite(buf, 1, len, f) != len) { 561 wpa_printf(MSG_INFO, "EAP-FAST: Failed to write all " 562 "PACs into '%s'", pac_file); 563 fclose(f); 564 return -1; 565 } 566 os_free(buf); 567 fclose(f); 568 } 569 570 return 0; 571 } 572 573 574 static int eap_fast_add_pac_data(struct eap_fast_pac *pac, char **buf, 575 char **pos, size_t *buf_len) 576 { 577 int ret; 578 579 ret = os_snprintf(*pos, *buf + *buf_len - *pos, 580 "START\nPAC-Type=%d\n", pac->pac_type); 581 if (os_snprintf_error(*buf + *buf_len - *pos, ret)) 582 return -1; 583 584 *pos += ret; 585 eap_fast_write(buf, pos, buf_len, "PAC-Key", 586 pac->pac_key, EAP_FAST_PAC_KEY_LEN, 0); 587 eap_fast_write(buf, pos, buf_len, "PAC-Opaque", 588 pac->pac_opaque, pac->pac_opaque_len, 0); 589 eap_fast_write(buf, pos, buf_len, "PAC-Info", 590 pac->pac_info, pac->pac_info_len, 0); 591 eap_fast_write(buf, pos, buf_len, "A-ID", 592 pac->a_id, pac->a_id_len, 0); 593 eap_fast_write(buf, pos, buf_len, "I-ID", 594 pac->i_id, pac->i_id_len, 1); 595 eap_fast_write(buf, pos, buf_len, "A-ID-Info", 596 pac->a_id_info, pac->a_id_info_len, 1); 597 if (*buf == NULL) { 598 wpa_printf(MSG_DEBUG, "EAP-FAST: No memory for PAC " 599 "data"); 600 return -1; 601 } 602 ret = os_snprintf(*pos, *buf + *buf_len - *pos, "END\n"); 603 if (os_snprintf_error(*buf + *buf_len - *pos, ret)) 604 return -1; 605 *pos += ret; 606 607 return 0; 608 } 609 610 611 /** 612 * eap_fast_save_pac - Save PAC entries (text format) 613 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 614 * @pac_root: Root of the PAC list 615 * @pac_file: Name of the PAC file/blob 616 * Returns: 0 on success, -1 on failure 617 */ 618 int eap_fast_save_pac(struct eap_sm *sm, struct eap_fast_pac *pac_root, 619 const char *pac_file) 620 { 621 struct eap_fast_pac *pac; 622 int ret, count = 0; 623 char *buf, *pos; 624 size_t buf_len; 625 626 if (pac_file == NULL) 627 return -1; 628 629 buf_len = 1024; 630 pos = buf = os_malloc(buf_len); 631 if (buf == NULL) 632 return -1; 633 634 ret = os_snprintf(pos, buf + buf_len - pos, "%s\n", pac_file_hdr); 635 if (os_snprintf_error(buf + buf_len - pos, ret)) { 636 os_free(buf); 637 return -1; 638 } 639 pos += ret; 640 641 pac = pac_root; 642 while (pac) { 643 if (eap_fast_add_pac_data(pac, &buf, &pos, &buf_len)) { 644 os_free(buf); 645 return -1; 646 } 647 count++; 648 pac = pac->next; 649 } 650 651 if (eap_fast_write_pac(sm, pac_file, buf, pos - buf)) { 652 os_free(buf); 653 return -1; 654 } 655 656 wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %d PAC entries into '%s'", 657 count, pac_file); 658 659 return 0; 660 } 661 662 663 /** 664 * eap_fast_pac_list_truncate - Truncate a PAC list to the given length 665 * @pac_root: Root of the PAC list 666 * @max_len: Maximum length of the list (>= 1) 667 * Returns: Number of PAC entries removed 668 */ 669 size_t eap_fast_pac_list_truncate(struct eap_fast_pac *pac_root, 670 size_t max_len) 671 { 672 struct eap_fast_pac *pac, *prev; 673 size_t count; 674 675 pac = pac_root; 676 prev = NULL; 677 count = 0; 678 679 while (pac) { 680 count++; 681 if (count > max_len) 682 break; 683 prev = pac; 684 pac = pac->next; 685 } 686 687 if (count <= max_len || prev == NULL) 688 return 0; 689 690 count = 0; 691 prev->next = NULL; 692 693 while (pac) { 694 prev = pac; 695 pac = pac->next; 696 eap_fast_free_pac(prev); 697 count++; 698 } 699 700 return count; 701 } 702 703 704 static void eap_fast_pac_get_a_id(struct eap_fast_pac *pac) 705 { 706 u8 *pos, *end; 707 u16 type, len; 708 709 pos = pac->pac_info; 710 end = pos + pac->pac_info_len; 711 712 while (pos + 4 < end) { 713 type = WPA_GET_BE16(pos); 714 pos += 2; 715 len = WPA_GET_BE16(pos); 716 pos += 2; 717 if (len > (unsigned int) (end - pos)) 718 break; 719 720 if (type == PAC_TYPE_A_ID) { 721 os_free(pac->a_id); 722 pac->a_id = os_malloc(len); 723 if (pac->a_id == NULL) 724 break; 725 os_memcpy(pac->a_id, pos, len); 726 pac->a_id_len = len; 727 } 728 729 if (type == PAC_TYPE_A_ID_INFO) { 730 os_free(pac->a_id_info); 731 pac->a_id_info = os_malloc(len); 732 if (pac->a_id_info == NULL) 733 break; 734 os_memcpy(pac->a_id_info, pos, len); 735 pac->a_id_info_len = len; 736 } 737 738 pos += len; 739 } 740 } 741 742 743 /** 744 * eap_fast_load_pac_bin - Load PAC entries (binary format) 745 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 746 * @pac_root: Pointer to root of the PAC list (to be filled) 747 * @pac_file: Name of the PAC file/blob to load 748 * Returns: 0 on success, -1 on failure 749 */ 750 int eap_fast_load_pac_bin(struct eap_sm *sm, struct eap_fast_pac **pac_root, 751 const char *pac_file) 752 { 753 const struct wpa_config_blob *blob = NULL; 754 u8 *buf, *end, *pos; 755 size_t len, count = 0; 756 struct eap_fast_pac *pac, *prev; 757 758 *pac_root = NULL; 759 760 if (pac_file == NULL) 761 return -1; 762 763 if (os_strncmp(pac_file, "blob://", 7) == 0) { 764 blob = eap_get_config_blob(sm, pac_file + 7); 765 if (blob == NULL) { 766 wpa_printf(MSG_INFO, "EAP-FAST: No PAC blob '%s' - " 767 "assume no PAC entries have been " 768 "provisioned", pac_file + 7); 769 return 0; 770 } 771 buf = blob->data; 772 len = blob->len; 773 } else { 774 buf = (u8 *) os_readfile(pac_file, &len); 775 if (buf == NULL) { 776 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file '%s' - " 777 "assume no PAC entries have been " 778 "provisioned", pac_file); 779 return 0; 780 } 781 } 782 783 if (len == 0) { 784 if (blob == NULL) 785 os_free(buf); 786 return 0; 787 } 788 789 if (len < 6 || WPA_GET_BE32(buf) != EAP_FAST_PAC_BINARY_MAGIC || 790 WPA_GET_BE16(buf + 4) != EAP_FAST_PAC_BINARY_FORMAT_VERSION) { 791 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC file '%s' (bin)", 792 pac_file); 793 if (blob == NULL) 794 os_free(buf); 795 return -1; 796 } 797 798 pac = prev = NULL; 799 pos = buf + 6; 800 end = buf + len; 801 while (pos < end) { 802 u16 val; 803 804 if (end - pos < 2 + EAP_FAST_PAC_KEY_LEN + 2 + 2) 805 goto parse_fail; 806 807 pac = os_zalloc(sizeof(*pac)); 808 if (pac == NULL) 809 goto parse_fail; 810 811 pac->pac_type = WPA_GET_BE16(pos); 812 pos += 2; 813 os_memcpy(pac->pac_key, pos, EAP_FAST_PAC_KEY_LEN); 814 pos += EAP_FAST_PAC_KEY_LEN; 815 val = WPA_GET_BE16(pos); 816 pos += 2; 817 if (val > end - pos) 818 goto parse_fail; 819 pac->pac_opaque_len = val; 820 pac->pac_opaque = os_malloc(pac->pac_opaque_len); 821 if (pac->pac_opaque == NULL) 822 goto parse_fail; 823 os_memcpy(pac->pac_opaque, pos, pac->pac_opaque_len); 824 pos += pac->pac_opaque_len; 825 if (2 > end - pos) 826 goto parse_fail; 827 val = WPA_GET_BE16(pos); 828 pos += 2; 829 if (val > end - pos) 830 goto parse_fail; 831 pac->pac_info_len = val; 832 pac->pac_info = os_malloc(pac->pac_info_len); 833 if (pac->pac_info == NULL) 834 goto parse_fail; 835 os_memcpy(pac->pac_info, pos, pac->pac_info_len); 836 pos += pac->pac_info_len; 837 eap_fast_pac_get_a_id(pac); 838 839 count++; 840 if (prev) 841 prev->next = pac; 842 else 843 *pac_root = pac; 844 prev = pac; 845 } 846 847 if (blob == NULL) 848 os_free(buf); 849 850 wpa_printf(MSG_DEBUG, "EAP-FAST: Read %lu PAC entries from '%s' (bin)", 851 (unsigned long) count, pac_file); 852 853 return 0; 854 855 parse_fail: 856 wpa_printf(MSG_INFO, "EAP-FAST: Failed to parse PAC file '%s' (bin)", 857 pac_file); 858 if (blob == NULL) 859 os_free(buf); 860 if (pac) 861 eap_fast_free_pac(pac); 862 return -1; 863 } 864 865 866 /** 867 * eap_fast_save_pac_bin - Save PAC entries (binary format) 868 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 869 * @pac_root: Root of the PAC list 870 * @pac_file: Name of the PAC file/blob 871 * Returns: 0 on success, -1 on failure 872 */ 873 int eap_fast_save_pac_bin(struct eap_sm *sm, struct eap_fast_pac *pac_root, 874 const char *pac_file) 875 { 876 size_t len, count = 0; 877 struct eap_fast_pac *pac; 878 u8 *buf, *pos; 879 880 len = 6; 881 pac = pac_root; 882 while (pac) { 883 if (pac->pac_opaque_len > 65535 || 884 pac->pac_info_len > 65535) 885 return -1; 886 len += 2 + EAP_FAST_PAC_KEY_LEN + 2 + pac->pac_opaque_len + 887 2 + pac->pac_info_len; 888 pac = pac->next; 889 } 890 891 buf = os_malloc(len); 892 if (buf == NULL) 893 return -1; 894 895 pos = buf; 896 WPA_PUT_BE32(pos, EAP_FAST_PAC_BINARY_MAGIC); 897 pos += 4; 898 WPA_PUT_BE16(pos, EAP_FAST_PAC_BINARY_FORMAT_VERSION); 899 pos += 2; 900 901 pac = pac_root; 902 while (pac) { 903 WPA_PUT_BE16(pos, pac->pac_type); 904 pos += 2; 905 os_memcpy(pos, pac->pac_key, EAP_FAST_PAC_KEY_LEN); 906 pos += EAP_FAST_PAC_KEY_LEN; 907 WPA_PUT_BE16(pos, pac->pac_opaque_len); 908 pos += 2; 909 os_memcpy(pos, pac->pac_opaque, pac->pac_opaque_len); 910 pos += pac->pac_opaque_len; 911 WPA_PUT_BE16(pos, pac->pac_info_len); 912 pos += 2; 913 os_memcpy(pos, pac->pac_info, pac->pac_info_len); 914 pos += pac->pac_info_len; 915 916 pac = pac->next; 917 count++; 918 } 919 920 if (eap_fast_write_pac(sm, pac_file, (char *) buf, len)) { 921 os_free(buf); 922 return -1; 923 } 924 925 wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %lu PAC entries into '%s' " 926 "(bin)", (unsigned long) count, pac_file); 927 928 return 0; 929 } 930