src/eap_peer/eap_fast_pac.c

   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         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
 343 static 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
 361 static 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
 372 static 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
 382 static 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
 392 static 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  */
 410 int 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             os_strcmp(pac_file_hdr, rc.buf) != 0)
 427                 err = "Unrecognized header line";
 428
 429         while (!err && eap_fast_read_line(&rc, &pos) == 0) {
 430                 if (os_strcmp(rc.buf, "START") == 0)
 431                         err = eap_fast_parse_start(&pac);
 432                 else if (os_strcmp(rc.buf, "END") == 0) {
 433                         err = eap_fast_parse_end(pac_root, &pac);
 434                         count++;
 435                 } else if (!pac)
 436                         err = "Unexpected line outside START/END block";
 437                 else if (os_strcmp(rc.buf, "PAC-Type") == 0)
 438                         err = eap_fast_parse_pac_type(pac, pos);
 439                 else if (os_strcmp(rc.buf, "PAC-Key") == 0)
 440                         err = eap_fast_parse_pac_key(pac, pos);
 441                 else if (os_strcmp(rc.buf, "PAC-Opaque") == 0)
 442                         err = eap_fast_parse_pac_opaque(pac, pos);
 443                 else if (os_strcmp(rc.buf, "A-ID") == 0)
 444                         err = eap_fast_parse_a_id(pac, pos);
 445                 else if (os_strcmp(rc.buf, "I-ID") == 0)
 446                         err = eap_fast_parse_i_id(pac, pos);
 447                 else if (os_strcmp(rc.buf, "A-ID-Info") == 0)
 448                         err = eap_fast_parse_a_id_info(pac, pos);
 449         }
 450
 451         if (pac) {
 452                 err = "PAC block not terminated with END";
 453                 eap_fast_free_pac(pac);
 454         }
 455
 456         eap_fast_deinit_pac_data(&rc);
 457
 458         if (err) {
 459                 wpa_printf(MSG_INFO, "EAP-FAST: %s in '%s:%d'",
 460                            err, pac_file, rc.line);
 461                 return -1;
 462         }
 463
 464         wpa_printf(MSG_DEBUG, "EAP-FAST: Read %d PAC entries from '%s'",
 465                    count, pac_file);
 466
 467         return 0;
 468 }
 469
 470
 471 static void eap_fast_write(char **buf, char **pos, size_t *buf_len,
 472                            const char *field, const u8 *data,
 473                            size_t len, int txt)
 474 {
 475         size_t i, need;
 476         int ret;
 477         char *end;
 478
 479         if (data == NULL || buf == NULL || *buf == NULL ||
 480             pos == NULL || *pos == NULL || *pos < *buf)
 481                 return;
 482
 483         need = os_strlen(field) + len * 2 + 30;
 484         if (txt)
 485                 need += os_strlen(field) + len + 20;
 486
 487         if (*pos - *buf + need > *buf_len) {
 488                 char *nbuf = os_realloc(*buf, *buf_len + need);
 489                 if (nbuf == NULL) {
 490                         os_free(*buf);
 491                         *buf = NULL;
 492                         return;
 493                 }
 494                 *pos = nbuf + (*pos - *buf);
 495                 *buf = nbuf;
 496                 *buf_len += need;
 497         }
 498         end = *buf + *buf_len;
 499
 500         ret = os_snprintf(*pos, end - *pos, "%s=", field);
 501         if (ret < 0 || ret >= end - *pos)
 502                 return;
 503         *pos += ret;
 504         *pos += wpa_snprintf_hex(*pos, end - *pos, data, len);
 505         ret = os_snprintf(*pos, end - *pos, "\n");
 506         if (ret < 0 || ret >= end - *pos)
 507                 return;
 508         *pos += ret;
 509
 510         if (txt) {
 511                 ret = os_snprintf(*pos, end - *pos, "%s-txt=", field);
 512                 if (ret < 0 || ret >= end - *pos)
 513                         return;
 514                 *pos += ret;
 515                 for (i = 0; i < len; i++) {
 516                         ret = os_snprintf(*pos, end - *pos, "%c", data[i]);
 517                         if (ret < 0 || ret >= end - *pos)
 518                                 return;
 519                         *pos += ret;
 520                 }
 521                 ret = os_snprintf(*pos, end - *pos, "\n");
 522                 if (ret < 0 || ret >= end - *pos)
 523                         return;
 524                 *pos += ret;
 525         }
 526 }
 527
 528
 529 static int eap_fast_write_pac(struct eap_sm *sm, const char *pac_file,
 530                               char *buf, size_t len)
 531 {
 532         if (os_strncmp(pac_file, "blob://", 7) == 0) {
 533                 struct wpa_config_blob *blob;
 534                 blob = os_zalloc(sizeof(*blob));
 535                 if (blob == NULL)
 536                         return -1;
 537                 blob->data = (u8 *) buf;
 538                 blob->len = len;
 539                 buf = NULL;
 540                 blob->name = os_strdup(pac_file + 7);
 541                 if (blob->name == NULL) {
 542                         os_free(blob);
 543                         return -1;
 544                 }
 545                 eap_set_config_blob(sm, blob);
 546         } else {
 547                 FILE *f;
 548                 f = fopen(pac_file, "wb");
 549                 if (f == NULL) {
 550                         wpa_printf(MSG_INFO, "EAP-FAST: Failed to open PAC "
 551                                    "file '%s' for writing", pac_file);
 552                         return -1;
 553                 }
 554                 if (fwrite(buf, 1, len, f) != len) {
 555                         wpa_printf(MSG_INFO, "EAP-FAST: Failed to write all "
 556                                    "PACs into '%s'", pac_file);
 557                         fclose(f);
 558                         return -1;
 559                 }
 560                 os_free(buf);
 561                 fclose(f);
 562         }
 563
 564         return 0;
 565 }
 566
 567
 568 static int eap_fast_add_pac_data(struct eap_fast_pac *pac, char **buf,
 569                                  char **pos, size_t *buf_len)
 570 {
 571         int ret;
 572
 573         ret = os_snprintf(*pos, *buf + *buf_len - *pos,
 574                           "START\nPAC-Type=%d\n", pac->pac_type);
 575         if (ret < 0 || ret >= *buf + *buf_len - *pos)
 576                 return -1;
 577
 578         *pos += ret;
 579         eap_fast_write(buf, pos, buf_len, "PAC-Key",
 580                        pac->pac_key, EAP_FAST_PAC_KEY_LEN, 0);
 581         eap_fast_write(buf, pos, buf_len, "PAC-Opaque",
 582                        pac->pac_opaque, pac->pac_opaque_len, 0);
 583         eap_fast_write(buf, pos, buf_len, "PAC-Info",
 584                        pac->pac_info, pac->pac_info_len, 0);
 585         eap_fast_write(buf, pos, buf_len, "A-ID",
 586                        pac->a_id, pac->a_id_len, 0);
 587         eap_fast_write(buf, pos, buf_len, "I-ID",
 588                        pac->i_id, pac->i_id_len, 1);
 589         eap_fast_write(buf, pos, buf_len, "A-ID-Info",
 590                        pac->a_id_info, pac->a_id_info_len, 1);
 591         if (*buf == NULL) {
 592                 wpa_printf(MSG_DEBUG, "EAP-FAST: No memory for PAC "
 593                            "data");
 594                 return -1;
 595         }
 596         ret = os_snprintf(*pos, *buf + *buf_len - *pos, "END\n");
 597         if (ret < 0 || ret >= *buf + *buf_len - *pos)
 598                 return -1;
 599         *pos += ret;
 600
 601         return 0;
 602 }
 603
 604
 605 /**
 606  * eap_fast_save_pac - Save PAC entries (text format)
 607  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 608  * @pac_root: Root of the PAC list
 609  * @pac_file: Name of the PAC file/blob
 610  * Returns: 0 on success, -1 on failure
 611  */
 612 int eap_fast_save_pac(struct eap_sm *sm, struct eap_fast_pac *pac_root,
 613                       const char *pac_file)
 614 {
 615         struct eap_fast_pac *pac;
 616         int ret, count = 0;
 617         char *buf, *pos;
 618         size_t buf_len;
 619
 620         if (pac_file == NULL)
 621                 return -1;
 622
 623         buf_len = 1024;
 624         pos = buf = os_malloc(buf_len);
 625         if (buf == NULL)
 626                 return -1;
 627
 628         ret = os_snprintf(pos, buf + buf_len - pos, "%s\n", pac_file_hdr);
 629         if (ret < 0 || ret >= buf + buf_len - pos) {
 630                 os_free(buf);
 631                 return -1;
 632         }
 633         pos += ret;
 634
 635         pac = pac_root;
 636         while (pac) {
 637                 if (eap_fast_add_pac_data(pac, &buf, &pos, &buf_len)) {
 638                         os_free(buf);
 639                         return -1;
 640                 }
 641                 count++;
 642                 pac = pac->next;
 643         }
 644
 645         if (eap_fast_write_pac(sm, pac_file, buf, pos - buf)) {
 646                 os_free(buf);
 647                 return -1;
 648         }
 649
 650         wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %d PAC entries into '%s'",
 651                    count, pac_file);
 652
 653         return 0;
 654 }
 655
 656
 657 /**
 658  * eap_fast_pac_list_truncate - Truncate a PAC list to the given length
 659  * @pac_root: Root of the PAC list
 660  * @max_len: Maximum length of the list (>= 1)
 661  * Returns: Number of PAC entries removed
 662  */
 663 size_t eap_fast_pac_list_truncate(struct eap_fast_pac *pac_root,
 664                                   size_t max_len)
 665 {
 666         struct eap_fast_pac *pac, *prev;
 667         size_t count;
 668
 669         pac = pac_root;
 670         prev = NULL;
 671         count = 0;
 672
 673         while (pac) {
 674                 count++;
 675                 if (count > max_len)
 676                         break;
 677                 prev = pac;
 678                 pac = pac->next;
 679         }
 680
 681         if (count <= max_len || prev == NULL)
 682                 return 0;
 683
 684         count = 0;
 685         prev->next = NULL;
 686
 687         while (pac) {
 688                 prev = pac;
 689                 pac = pac->next;
 690                 eap_fast_free_pac(prev);
 691                 count++;
 692         }
 693
 694         return count;
 695 }
 696
 697
 698 static void eap_fast_pac_get_a_id(struct eap_fast_pac *pac)
 699 {
 700         u8 *pos, *end;
 701         u16 type, len;
 702
 703         pos = pac->pac_info;
 704         end = pos + pac->pac_info_len;
 705
 706         while (pos + 4 < end) {
 707                 type = WPA_GET_BE16(pos);
 708                 pos += 2;
 709                 len = WPA_GET_BE16(pos);
 710                 pos += 2;
 711                 if (pos + len > end)
 712                         break;
 713
 714                 if (type == PAC_TYPE_A_ID) {
 715                         os_free(pac->a_id);
 716                         pac->a_id = os_malloc(len);
 717                         if (pac->a_id == NULL)
 718                                 break;
 719                         os_memcpy(pac->a_id, pos, len);
 720                         pac->a_id_len = len;
 721                 }
 722
 723                 if (type == PAC_TYPE_A_ID_INFO) {
 724                         os_free(pac->a_id_info);
 725                         pac->a_id_info = os_malloc(len);
 726                         if (pac->a_id_info == NULL)
 727                                 break;
 728                         os_memcpy(pac->a_id_info, pos, len);
 729                         pac->a_id_info_len = len;
 730                 }
 731
 732                 pos += len;
 733         }
 734 }
 735
 736
 737 /**
 738  * eap_fast_load_pac_bin - Load PAC entries (binary format)
 739  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 740  * @pac_root: Pointer to root of the PAC list (to be filled)
 741  * @pac_file: Name of the PAC file/blob to load
 742  * Returns: 0 on success, -1 on failure
 743  */
 744 int eap_fast_load_pac_bin(struct eap_sm *sm, struct eap_fast_pac **pac_root,
 745                           const char *pac_file)
 746 {
 747         const struct wpa_config_blob *blob = NULL;
 748         u8 *buf, *end, *pos;
 749         size_t len, count = 0;
 750         struct eap_fast_pac *pac, *prev;
 751
 752         *pac_root = NULL;
 753
 754         if (pac_file == NULL)
 755                 return -1;
 756
 757         if (os_strncmp(pac_file, "blob://", 7) == 0) {
 758                 blob = eap_get_config_blob(sm, pac_file + 7);
 759                 if (blob == NULL) {
 760                         wpa_printf(MSG_INFO, "EAP-FAST: No PAC blob '%s' - "
 761                                    "assume no PAC entries have been "
 762                                    "provisioned", pac_file + 7);
 763                         return 0;
 764                 }
 765                 buf = blob->data;
 766                 len = blob->len;
 767         } else {
 768                 buf = (u8 *) os_readfile(pac_file, &len);
 769                 if (buf == NULL) {
 770                         wpa_printf(MSG_INFO, "EAP-FAST: No PAC file '%s' - "
 771                                    "assume no PAC entries have been "
 772                                    "provisioned", pac_file);
 773                         return 0;
 774                 }
 775         }
 776
 777         if (len == 0) {
 778                 if (blob == NULL)
 779                         os_free(buf);
 780                 return 0;
 781         }
 782
 783         if (len < 6 || WPA_GET_BE32(buf) != EAP_FAST_PAC_BINARY_MAGIC ||
 784             WPA_GET_BE16(buf + 4) != EAP_FAST_PAC_BINARY_FORMAT_VERSION) {
 785                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC file '%s' (bin)",
 786                            pac_file);
 787                 if (blob == NULL)
 788                         os_free(buf);
 789                 return -1;
 790         }
 791
 792         pac = prev = NULL;
 793         pos = buf + 6;
 794         end = buf + len;
 795         while (pos < end) {
 796                 if (end - pos < 2 + 32 + 2 + 2)
 797                         goto parse_fail;
 798
 799                 pac = os_zalloc(sizeof(*pac));
 800                 if (pac == NULL)
 801                         goto parse_fail;
 802
 803                 pac->pac_type = WPA_GET_BE16(pos);
 804                 pos += 2;
 805                 os_memcpy(pac->pac_key, pos, EAP_FAST_PAC_KEY_LEN);
 806                 pos += EAP_FAST_PAC_KEY_LEN;
 807                 pac->pac_opaque_len = WPA_GET_BE16(pos);
 808                 pos += 2;
 809                 if (pos + pac->pac_opaque_len + 2 > end)
 810                         goto parse_fail;
 811                 pac->pac_opaque = os_malloc(pac->pac_opaque_len);
 812                 if (pac->pac_opaque == NULL)
 813                         goto parse_fail;
 814                 os_memcpy(pac->pac_opaque, pos, pac->pac_opaque_len);
 815                 pos += pac->pac_opaque_len;
 816                 pac->pac_info_len = WPA_GET_BE16(pos);
 817                 pos += 2;
 818                 if (pos + pac->pac_info_len > end)
 819                         goto parse_fail;
 820                 pac->pac_info = os_malloc(pac->pac_info_len);
 821                 if (pac->pac_info == NULL)
 822                         goto parse_fail;
 823                 os_memcpy(pac->pac_info, pos, pac->pac_info_len);
 824                 pos += pac->pac_info_len;
 825                 eap_fast_pac_get_a_id(pac);
 826
 827                 count++;
 828                 if (prev)
 829                         prev->next = pac;
 830                 else
 831                         *pac_root = pac;
 832                 prev = pac;
 833         }
 834
 835         if (blob == NULL)
 836                 os_free(buf);
 837
 838         wpa_printf(MSG_DEBUG, "EAP-FAST: Read %lu PAC entries from '%s' (bin)",
 839                    (unsigned long) count, pac_file);
 840
 841         return 0;
 842
 843 parse_fail:
 844         wpa_printf(MSG_INFO, "EAP-FAST: Failed to parse PAC file '%s' (bin)",
 845                    pac_file);
 846         if (blob == NULL)
 847                 os_free(buf);
 848         if (pac)
 849                 eap_fast_free_pac(pac);
 850         return -1;
 851 }
 852
 853
 854 /**
 855  * eap_fast_save_pac_bin - Save PAC entries (binary format)
 856  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 857  * @pac_root: Root of the PAC list
 858  * @pac_file: Name of the PAC file/blob
 859  * Returns: 0 on success, -1 on failure
 860  */
 861 int eap_fast_save_pac_bin(struct eap_sm *sm, struct eap_fast_pac *pac_root,
 862                           const char *pac_file)
 863 {
 864         size_t len, count = 0;
 865         struct eap_fast_pac *pac;
 866         u8 *buf, *pos;
 867
 868         len = 6;
 869         pac = pac_root;
 870         while (pac) {
 871                 if (pac->pac_opaque_len > 65535 ||
 872                     pac->pac_info_len > 65535)
 873                         return -1;
 874                 len += 2 + EAP_FAST_PAC_KEY_LEN + 2 + pac->pac_opaque_len +
 875                         2 + pac->pac_info_len;
 876                 pac = pac->next;
 877         }
 878
 879         buf = os_malloc(len);
 880         if (buf == NULL)
 881                 return -1;
 882
 883         pos = buf;
 884         WPA_PUT_BE32(pos, EAP_FAST_PAC_BINARY_MAGIC);
 885         pos += 4;
 886         WPA_PUT_BE16(pos, EAP_FAST_PAC_BINARY_FORMAT_VERSION);
 887         pos += 2;
 888
 889         pac = pac_root;
 890         while (pac) {
 891                 WPA_PUT_BE16(pos, pac->pac_type);
 892                 pos += 2;
 893                 os_memcpy(pos, pac->pac_key, EAP_FAST_PAC_KEY_LEN);
 894                 pos += EAP_FAST_PAC_KEY_LEN;
 895                 WPA_PUT_BE16(pos, pac->pac_opaque_len);
 896                 pos += 2;
 897                 os_memcpy(pos, pac->pac_opaque, pac->pac_opaque_len);
 898                 pos += pac->pac_opaque_len;
 899                 WPA_PUT_BE16(pos, pac->pac_info_len);
 900                 pos += 2;
 901                 os_memcpy(pos, pac->pac_info, pac->pac_info_len);
 902                 pos += pac->pac_info_len;
 903
 904                 pac = pac->next;
 905                 count++;
 906         }
 907
 908         if (eap_fast_write_pac(sm, pac_file, (char *) buf, len)) {
 909                 os_free(buf);
 910                 return -1;
 911         }
 912
 913         wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %lu PAC entries into '%s' "
 914                    "(bin)", (unsigned long) count, pac_file);
 915
 916         return 0;
 917 }