eap_fast_pac.c revision a54fa5fb807eaeff45464139b5a7759f060cec68
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 */ 20static 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 */ 50void 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 */ 69struct 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 86static 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 113static 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 */ 139int 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 180struct 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 189static 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 232static 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 254static 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 291static 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 299static 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 312static 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 330static const char * eap_fast_parse_pac_type(struct eap_fast_pac *pac, 331 char *pos) 332{ 333 pac->pac_type = atoi(pos); 334 if (pac->pac_type != PAC_TYPE_TUNNEL_PAC && 335 pac->pac_type != PAC_TYPE_USER_AUTHORIZATION && 336 pac->pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) 337 return "Unrecognized PAC-Type"; 338 339 return NULL; 340} 341 342 343static const char * eap_fast_parse_pac_key(struct eap_fast_pac *pac, char *pos) 344{ 345 u8 *key; 346 size_t key_len; 347 348 key = eap_fast_parse_hex(pos, &key_len); 349 if (key == NULL || key_len != EAP_FAST_PAC_KEY_LEN) { 350 os_free(key); 351 return "Invalid PAC-Key"; 352 } 353 354 os_memcpy(pac->pac_key, key, EAP_FAST_PAC_KEY_LEN); 355 os_free(key); 356 357 return NULL; 358} 359 360 361static const char * eap_fast_parse_pac_opaque(struct eap_fast_pac *pac, 362 char *pos) 363{ 364 os_free(pac->pac_opaque); 365 pac->pac_opaque = eap_fast_parse_hex(pos, &pac->pac_opaque_len); 366 if (pac->pac_opaque == NULL) 367 return "Invalid PAC-Opaque"; 368 return NULL; 369} 370 371 372static const char * eap_fast_parse_a_id(struct eap_fast_pac *pac, char *pos) 373{ 374 os_free(pac->a_id); 375 pac->a_id = eap_fast_parse_hex(pos, &pac->a_id_len); 376 if (pac->a_id == NULL) 377 return "Invalid A-ID"; 378 return NULL; 379} 380 381 382static const char * eap_fast_parse_i_id(struct eap_fast_pac *pac, char *pos) 383{ 384 os_free(pac->i_id); 385 pac->i_id = eap_fast_parse_hex(pos, &pac->i_id_len); 386 if (pac->i_id == NULL) 387 return "Invalid I-ID"; 388 return NULL; 389} 390 391 392static const char * eap_fast_parse_a_id_info(struct eap_fast_pac *pac, 393 char *pos) 394{ 395 os_free(pac->a_id_info); 396 pac->a_id_info = eap_fast_parse_hex(pos, &pac->a_id_info_len); 397 if (pac->a_id_info == NULL) 398 return "Invalid A-ID-Info"; 399 return NULL; 400} 401 402 403/** 404 * eap_fast_load_pac - Load PAC entries (text format) 405 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 406 * @pac_root: Pointer to root of the PAC list (to be filled) 407 * @pac_file: Name of the PAC file/blob to load 408 * Returns: 0 on success, -1 on failure 409 */ 410int eap_fast_load_pac(struct eap_sm *sm, struct eap_fast_pac **pac_root, 411 const char *pac_file) 412{ 413 struct eap_fast_read_ctx rc; 414 struct eap_fast_pac *pac = NULL; 415 int count = 0; 416 char *pos; 417 const char *err = NULL; 418 419 if (pac_file == NULL) 420 return -1; 421 422 if (eap_fast_init_pac_data(sm, pac_file, &rc) < 0) 423 return 0; 424 425 if (eap_fast_read_line(&rc, &pos) < 0) { 426 /* empty file - assume it is fine to overwrite */ 427 eap_fast_deinit_pac_data(&rc); 428 return 0; 429 } 430 if (os_strcmp(pac_file_hdr, rc.buf) != 0) 431 err = "Unrecognized header line"; 432 433 while (!err && eap_fast_read_line(&rc, &pos) == 0) { 434 if (os_strcmp(rc.buf, "START") == 0) 435 err = eap_fast_parse_start(&pac); 436 else if (os_strcmp(rc.buf, "END") == 0) { 437 err = eap_fast_parse_end(pac_root, &pac); 438 count++; 439 } else if (!pac) 440 err = "Unexpected line outside START/END block"; 441 else if (os_strcmp(rc.buf, "PAC-Type") == 0) 442 err = eap_fast_parse_pac_type(pac, pos); 443 else if (os_strcmp(rc.buf, "PAC-Key") == 0) 444 err = eap_fast_parse_pac_key(pac, pos); 445 else if (os_strcmp(rc.buf, "PAC-Opaque") == 0) 446 err = eap_fast_parse_pac_opaque(pac, pos); 447 else if (os_strcmp(rc.buf, "A-ID") == 0) 448 err = eap_fast_parse_a_id(pac, pos); 449 else if (os_strcmp(rc.buf, "I-ID") == 0) 450 err = eap_fast_parse_i_id(pac, pos); 451 else if (os_strcmp(rc.buf, "A-ID-Info") == 0) 452 err = eap_fast_parse_a_id_info(pac, pos); 453 } 454 455 if (pac) { 456 err = "PAC block not terminated with END"; 457 eap_fast_free_pac(pac); 458 } 459 460 eap_fast_deinit_pac_data(&rc); 461 462 if (err) { 463 wpa_printf(MSG_INFO, "EAP-FAST: %s in '%s:%d'", 464 err, pac_file, rc.line); 465 return -1; 466 } 467 468 wpa_printf(MSG_DEBUG, "EAP-FAST: Read %d PAC entries from '%s'", 469 count, pac_file); 470 471 return 0; 472} 473 474 475static void eap_fast_write(char **buf, char **pos, size_t *buf_len, 476 const char *field, const u8 *data, 477 size_t len, int txt) 478{ 479 size_t i, need; 480 int ret; 481 char *end; 482 483 if (data == NULL || buf == NULL || *buf == NULL || 484 pos == NULL || *pos == NULL || *pos < *buf) 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 *pos = nbuf + (*pos - *buf); 499 *buf = nbuf; 500 *buf_len += need; 501 } 502 end = *buf + *buf_len; 503 504 ret = os_snprintf(*pos, end - *pos, "%s=", field); 505 if (ret < 0 || ret >= end - *pos) 506 return; 507 *pos += ret; 508 *pos += wpa_snprintf_hex(*pos, end - *pos, data, len); 509 ret = os_snprintf(*pos, end - *pos, "\n"); 510 if (ret < 0 || ret >= end - *pos) 511 return; 512 *pos += ret; 513 514 if (txt) { 515 ret = os_snprintf(*pos, end - *pos, "%s-txt=", field); 516 if (ret < 0 || ret >= end - *pos) 517 return; 518 *pos += ret; 519 for (i = 0; i < len; i++) { 520 ret = os_snprintf(*pos, end - *pos, "%c", data[i]); 521 if (ret < 0 || ret >= end - *pos) 522 return; 523 *pos += ret; 524 } 525 ret = os_snprintf(*pos, end - *pos, "\n"); 526 if (ret < 0 || ret >= end - *pos) 527 return; 528 *pos += ret; 529 } 530} 531 532 533static 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 572static 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 */ 616int 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 */ 667size_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 702static 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 */ 748int 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 847parse_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 */ 865int 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