libeap/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         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 }