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