contrib/hostapd/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                 /* 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
 475 static 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
 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 }