wpa_supplicant/config_file.c

   1 /*
   2  * WPA Supplicant / Configuration backend: text file
   3  * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  *
  14  * This file implements a configuration backend for text files. All the
  15  * configuration information is stored in a text file that uses a format
  16  * described in the sample configuration file, wpa_supplicant.conf.
  17  */
  18
  19 #include "includes.h"
  20
  21 #include "common.h"
  22 #include "config.h"
  23 #include "base64.h"
  24 #include "uuid.h"
  25 #include "eap_peer/eap_methods.h"
  26
  27
  28 /**
  29  * wpa_config_get_line - Read the next configuration file line
  30  * @s: Buffer for the line
  31  * @size: The buffer length
  32  * @stream: File stream to read from
  33  * @line: Pointer to a variable storing the file line number
  34  * @_pos: Buffer for the pointer to the beginning of data on the text line or
  35  * %NULL if not needed (returned value used instead)
  36  * Returns: Pointer to the beginning of data on the text line or %NULL if no
  37  * more text lines are available.
  38  *
  39  * This function reads the next non-empty line from the configuration file and
  40  * removes comments. The returned string is guaranteed to be null-terminated.
  41  */
  42 static char * wpa_config_get_line(char *s, int size, FILE *stream, int *line,
  43                                   char **_pos)
  44 {
  45         char *pos, *end, *sstart;
  46
  47         while (fgets(s, size, stream)) {
  48                 (*line)++;
  49                 s[size - 1] = '\0';
  50                 pos = s;
  51
  52                 /* Skip white space from the beginning of line. */
  53                 while (*pos == ' ' || *pos == '\t' || *pos == '\r')
  54                         pos++;
  55
  56                 /* Skip comment lines and empty lines */
  57                 if (*pos == '#' || *pos == '\n' || *pos == '\0')
  58                         continue;
  59
  60                 /*
  61                  * Remove # comments unless they are within a double quoted
  62                  * string.
  63                  */
  64                 sstart = os_strchr(pos, '"');
  65                 if (sstart)
  66                         sstart = os_strrchr(sstart + 1, '"');
  67                 if (!sstart)
  68                         sstart = pos;
  69                 end = os_strchr(sstart, '#');
  70                 if (end)
  71                         *end-- = '\0';
  72                 else
  73                         end = pos + os_strlen(pos) - 1;
  74
  75                 /* Remove trailing white space. */
  76                 while (end > pos &&
  77                        (*end == '\n' || *end == ' ' || *end == '\t' ||
  78                         *end == '\r'))
  79                         *end-- = '\0';
  80
  81                 if (*pos == '\0')
  82                         continue;
  83
  84                 if (_pos)
  85                         *_pos = pos;
  86                 return pos;
  87         }
  88
  89         if (_pos)
  90                 *_pos = NULL;
  91         return NULL;
  92 }
  93
  94
  95 static int wpa_config_validate_network(struct wpa_ssid *ssid, int line)
  96 {
  97         int errors = 0;
  98
  99         if (ssid->passphrase) {
 100                 if (ssid->psk_set) {
 101                         wpa_printf(MSG_ERROR, "Line %d: both PSK and "
 102                                    "passphrase configured.", line);
 103                         errors++;
 104                 }
 105                 wpa_config_update_psk(ssid);
 106         }
 107
 108         if ((ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_FT_PSK |
 109                                WPA_KEY_MGMT_PSK_SHA256)) &&
 110             !ssid->psk_set) {
 111                 wpa_printf(MSG_ERROR, "Line %d: WPA-PSK accepted for key "
 112                            "management, but no PSK configured.", line);
 113                 errors++;
 114         }
 115
 116         if ((ssid->group_cipher & WPA_CIPHER_CCMP) &&
 117             !(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
 118             !(ssid->pairwise_cipher & WPA_CIPHER_NONE)) {
 119                 /* Group cipher cannot be stronger than the pairwise cipher. */
 120                 wpa_printf(MSG_DEBUG, "Line %d: removed CCMP from group cipher"
 121                            " list since it was not allowed for pairwise "
 122                            "cipher", line);
 123                 ssid->group_cipher &= ~WPA_CIPHER_CCMP;
 124         }
 125
 126         return errors;
 127 }
 128
 129
 130 static struct wpa_ssid * wpa_config_read_network(FILE *f, int *line, int id)
 131 {
 132         struct wpa_ssid *ssid;
 133         int errors = 0, end = 0;
 134         char buf[256], *pos, *pos2;
 135
 136         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new network block",
 137                    *line);
 138         ssid = os_zalloc(sizeof(*ssid));
 139         if (ssid == NULL)
 140                 return NULL;
 141         ssid->id = id;
 142
 143         wpa_config_set_network_defaults(ssid);
 144
 145         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 146                 if (os_strcmp(pos, "}") == 0) {
 147                         end = 1;
 148                         break;
 149                 }
 150
 151                 pos2 = os_strchr(pos, '=');
 152                 if (pos2 == NULL) {
 153                         wpa_printf(MSG_ERROR, "Line %d: Invalid SSID line "
 154                                    "'%s'.", *line, pos);
 155                         errors++;
 156                         continue;
 157                 }
 158
 159                 *pos2++ = '\0';
 160                 if (*pos2 == '"') {
 161                         if (os_strchr(pos2 + 1, '"') == NULL) {
 162                                 wpa_printf(MSG_ERROR, "Line %d: invalid "
 163                                            "quotation '%s'.", *line, pos2);
 164                                 errors++;
 165                                 continue;
 166                         }
 167                 }
 168
 169                 if (wpa_config_set(ssid, pos, pos2, *line) < 0)
 170                         errors++;
 171         }
 172
 173         if (!end) {
 174                 wpa_printf(MSG_ERROR, "Line %d: network block was not "
 175                            "terminated properly.", *line);
 176                 errors++;
 177         }
 178
 179         errors += wpa_config_validate_network(ssid, *line);
 180
 181         if (errors) {
 182                 wpa_config_free_ssid(ssid);
 183                 ssid = NULL;
 184         }
 185
 186         return ssid;
 187 }
 188
 189
 190 #ifndef CONFIG_NO_CONFIG_BLOBS
 191 static struct wpa_config_blob * wpa_config_read_blob(FILE *f, int *line,
 192                                                      const char *name)
 193 {
 194         struct wpa_config_blob *blob;
 195         char buf[256], *pos;
 196         unsigned char *encoded = NULL, *nencoded;
 197         int end = 0;
 198         size_t encoded_len = 0, len;
 199
 200         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new named blob '%s'",
 201                    *line, name);
 202
 203         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 204                 if (os_strcmp(pos, "}") == 0) {
 205                         end = 1;
 206                         break;
 207                 }
 208
 209                 len = os_strlen(pos);
 210                 nencoded = os_realloc(encoded, encoded_len + len);
 211                 if (nencoded == NULL) {
 212                         wpa_printf(MSG_ERROR, "Line %d: not enough memory for "
 213                                    "blob", *line);
 214                         os_free(encoded);
 215                         return NULL;
 216                 }
 217                 encoded = nencoded;
 218                 os_memcpy(encoded + encoded_len, pos, len);
 219                 encoded_len += len;
 220         }
 221
 222         if (!end) {
 223                 wpa_printf(MSG_ERROR, "Line %d: blob was not terminated "
 224                            "properly", *line);
 225                 os_free(encoded);
 226                 return NULL;
 227         }
 228
 229         blob = os_zalloc(sizeof(*blob));
 230         if (blob == NULL) {
 231                 os_free(encoded);
 232                 return NULL;
 233         }
 234         blob->name = os_strdup(name);
 235         blob->data = base64_decode(encoded, encoded_len, &blob->len);
 236         os_free(encoded);
 237
 238         if (blob->name == NULL || blob->data == NULL) {
 239                 wpa_config_free_blob(blob);
 240                 return NULL;
 241         }
 242
 243         return blob;
 244 }
 245
 246
 247 static int wpa_config_process_blob(struct wpa_config *config, FILE *f,
 248                                    int *line, char *bname)
 249 {
 250         char *name_end;
 251         struct wpa_config_blob *blob;
 252
 253         name_end = os_strchr(bname, '=');
 254         if (name_end == NULL) {
 255                 wpa_printf(MSG_ERROR, "Line %d: no blob name terminator",
 256                            *line);
 257                 return -1;
 258         }
 259         *name_end = '\0';
 260
 261         blob = wpa_config_read_blob(f, line, bname);
 262         if (blob == NULL) {
 263                 wpa_printf(MSG_ERROR, "Line %d: failed to read blob %s",
 264                            *line, bname);
 265                 return -1;
 266         }
 267         wpa_config_set_blob(config, blob);
 268         return 0;
 269 }
 270 #endif /* CONFIG_NO_CONFIG_BLOBS */
 271
 272
 273 static int wpa_config_process_country(struct wpa_config *config, char *pos)
 274 {
 275         if (!pos[0] || !pos[1]) {
 276                 wpa_printf(MSG_DEBUG, "Invalid country set");
 277                 return -1;
 278         }
 279         config->alpha2[0] = pos[0];
 280         config->alpha2[1] = pos[1];
 281         wpa_printf(MSG_DEBUG, "country='%c%c'",
 282                    config->alpha2[0], config->alpha2[1]);
 283         return 0;
 284 }
 285
 286
 287 #ifdef CONFIG_CTRL_IFACE
 288 static int wpa_config_process_ctrl_interface(struct wpa_config *config,
 289                                              char *pos)
 290 {
 291         os_free(config->ctrl_interface);
 292         config->ctrl_interface = os_strdup(pos);
 293         wpa_printf(MSG_DEBUG, "ctrl_interface='%s'", config->ctrl_interface);
 294         return 0;
 295 }
 296
 297
 298 static int wpa_config_process_ctrl_interface_group(struct wpa_config *config,
 299                                                    char *pos)
 300 {
 301         os_free(config->ctrl_interface_group);
 302         config->ctrl_interface_group = os_strdup(pos);
 303         wpa_printf(MSG_DEBUG, "ctrl_interface_group='%s' (DEPRECATED)",
 304                    config->ctrl_interface_group);
 305         return 0;
 306 }
 307 #endif /* CONFIG_CTRL_IFACE */
 308
 309
 310 static int wpa_config_process_eapol_version(struct wpa_config *config,
 311                                             int line, char *pos)
 312 {
 313         config->eapol_version = atoi(pos);
 314         if (config->eapol_version < 1 || config->eapol_version > 2) {
 315                 wpa_printf(MSG_ERROR, "Line %d: Invalid EAPOL version (%d): "
 316                            "'%s'.", line, config->eapol_version, pos);
 317                 return -1;
 318         }
 319         wpa_printf(MSG_DEBUG, "eapol_version=%d", config->eapol_version);
 320         return 0;
 321 }
 322
 323
 324 static int wpa_config_process_ap_scan(struct wpa_config *config, char *pos)
 325 {
 326         config->ap_scan = atoi(pos);
 327         wpa_printf(MSG_DEBUG, "ap_scan=%d", config->ap_scan);
 328         return 0;
 329 }
 330
 331
 332 static int wpa_config_process_fast_reauth(struct wpa_config *config, char *pos)
 333 {
 334         config->fast_reauth = atoi(pos);
 335         wpa_printf(MSG_DEBUG, "fast_reauth=%d", config->fast_reauth);
 336         return 0;
 337 }
 338
 339
 340 #ifdef EAP_TLS_OPENSSL
 341
 342 static int wpa_config_process_opensc_engine_path(struct wpa_config *config,
 343                                                  char *pos)
 344 {
 345         os_free(config->opensc_engine_path);
 346         config->opensc_engine_path = os_strdup(pos);
 347         wpa_printf(MSG_DEBUG, "opensc_engine_path='%s'",
 348                    config->opensc_engine_path);
 349         return 0;
 350 }
 351
 352
 353 static int wpa_config_process_pkcs11_engine_path(struct wpa_config *config,
 354                                                  char *pos)
 355 {
 356         os_free(config->pkcs11_engine_path);
 357         config->pkcs11_engine_path = os_strdup(pos);
 358         wpa_printf(MSG_DEBUG, "pkcs11_engine_path='%s'",
 359                    config->pkcs11_engine_path);
 360         return 0;
 361 }
 362
 363
 364 static int wpa_config_process_pkcs11_module_path(struct wpa_config *config,
 365                                                  char *pos)
 366 {
 367         os_free(config->pkcs11_module_path);
 368         config->pkcs11_module_path = os_strdup(pos);
 369         wpa_printf(MSG_DEBUG, "pkcs11_module_path='%s'",
 370                    config->pkcs11_module_path);
 371         return 0;
 372 }
 373
 374 #endif /* EAP_TLS_OPENSSL */
 375
 376
 377 static int wpa_config_process_driver_param(struct wpa_config *config,
 378                                            char *pos)
 379 {
 380         os_free(config->driver_param);
 381         config->driver_param = os_strdup(pos);
 382         wpa_printf(MSG_DEBUG, "driver_param='%s'", config->driver_param);
 383         return 0;
 384 }
 385
 386
 387 static int wpa_config_process_pmk_lifetime(struct wpa_config *config,
 388                                            char *pos)
 389 {
 390         config->dot11RSNAConfigPMKLifetime = atoi(pos);
 391         wpa_printf(MSG_DEBUG, "dot11RSNAConfigPMKLifetime=%d",
 392                    config->dot11RSNAConfigPMKLifetime);
 393         return 0;
 394 }
 395
 396
 397 static int wpa_config_process_pmk_reauth_threshold(struct wpa_config *config,
 398                                                    char *pos)
 399 {
 400         config->dot11RSNAConfigPMKReauthThreshold = atoi(pos);
 401         wpa_printf(MSG_DEBUG, "dot11RSNAConfigPMKReauthThreshold=%d",
 402                    config->dot11RSNAConfigPMKReauthThreshold);
 403         return 0;
 404 }
 405
 406
 407 static int wpa_config_process_sa_timeout(struct wpa_config *config, char *pos)
 408 {
 409         config->dot11RSNAConfigSATimeout = atoi(pos);
 410         wpa_printf(MSG_DEBUG, "dot11RSNAConfigSATimeout=%d",
 411                    config->dot11RSNAConfigSATimeout);
 412         return 0;
 413 }
 414
 415
 416 #ifndef CONFIG_NO_CONFIG_WRITE
 417 static int wpa_config_process_update_config(struct wpa_config *config,
 418                                             char *pos)
 419 {
 420         config->update_config = atoi(pos);
 421         wpa_printf(MSG_DEBUG, "update_config=%d", config->update_config);
 422         return 0;
 423 }
 424 #endif /* CONFIG_NO_CONFIG_WRITE */
 425
 426
 427 static int wpa_config_process_load_dynamic_eap(int line, char *so)
 428 {
 429         int ret;
 430         wpa_printf(MSG_DEBUG, "load_dynamic_eap=%s", so);
 431         ret = eap_peer_method_load(so);
 432         if (ret == -2) {
 433                 wpa_printf(MSG_DEBUG, "This EAP type was already loaded - not "
 434                            "reloading.");
 435         } else if (ret) {
 436                 wpa_printf(MSG_ERROR, "Line %d: Failed to load dynamic EAP "
 437                            "method '%s'.", line, so);
 438                 return -1;
 439         }
 440
 441         return 0;
 442 }
 443
 444
 445 #ifdef CONFIG_WPS
 446 static int wpa_config_process_uuid(struct wpa_config *config, int line,
 447                                    char *pos)
 448 {
 449         char buf[40];
 450         if (uuid_str2bin(pos, config->uuid)) {
 451                 wpa_printf(MSG_ERROR, "Line %d: invalid UUID", line);
 452                 return -1;
 453         }
 454         uuid_bin2str(config->uuid, buf, sizeof(buf));
 455         wpa_printf(MSG_DEBUG, "uuid=%s", buf);
 456         return 0;
 457 }
 458 #endif /* CONFIG_WPS */
 459
 460
 461 static int wpa_config_process_global(struct wpa_config *config, char *pos,
 462                                      int line)
 463 {
 464 #ifdef CONFIG_CTRL_IFACE
 465         if (os_strncmp(pos, "ctrl_interface=", 15) == 0)
 466                 return wpa_config_process_ctrl_interface(config, pos + 15);
 467
 468         if (os_strncmp(pos, "ctrl_interface_group=", 21) == 0)
 469                 return wpa_config_process_ctrl_interface_group(config,
 470                                                                pos + 21);
 471 #endif /* CONFIG_CTRL_IFACE */
 472
 473         if (os_strncmp(pos, "eapol_version=", 14) == 0)
 474                 return wpa_config_process_eapol_version(config, line,
 475                                                         pos + 14);
 476
 477         if (os_strncmp(pos, "ap_scan=", 8) == 0)
 478                 return wpa_config_process_ap_scan(config, pos + 8);
 479
 480         if (os_strncmp(pos, "fast_reauth=", 12) == 0)
 481                 return wpa_config_process_fast_reauth(config, pos + 12);
 482
 483 #ifdef EAP_TLS_OPENSSL
 484         if (os_strncmp(pos, "opensc_engine_path=", 19) == 0)
 485                 return wpa_config_process_opensc_engine_path(config, pos + 19);
 486
 487         if (os_strncmp(pos, "pkcs11_engine_path=", 19) == 0)
 488                 return wpa_config_process_pkcs11_engine_path(config, pos + 19);
 489
 490         if (os_strncmp(pos, "pkcs11_module_path=", 19) == 0)
 491                 return wpa_config_process_pkcs11_module_path(config, pos + 19);
 492 #endif /* EAP_TLS_OPENSSL */
 493
 494         if (os_strncmp(pos, "driver_param=", 13) == 0)
 495                 return wpa_config_process_driver_param(config, pos + 13);
 496
 497         if (os_strncmp(pos, "dot11RSNAConfigPMKLifetime=", 27) == 0)
 498                 return wpa_config_process_pmk_lifetime(config, pos + 27);
 499
 500         if (os_strncmp(pos, "dot11RSNAConfigPMKReauthThreshold=", 34) == 0)
 501                 return wpa_config_process_pmk_reauth_threshold(config,
 502                                                                pos + 34);
 503
 504         if (os_strncmp(pos, "dot11RSNAConfigSATimeout=", 25) == 0)
 505                 return wpa_config_process_sa_timeout(config, pos + 25);
 506
 507 #ifndef CONFIG_NO_CONFIG_WRITE
 508         if (os_strncmp(pos, "update_config=", 14) == 0)
 509                 return wpa_config_process_update_config(config, pos + 14);
 510 #endif /* CONFIG_NO_CONFIG_WRITE */
 511
 512         if (os_strncmp(pos, "load_dynamic_eap=", 17) == 0)
 513                 return wpa_config_process_load_dynamic_eap(line, pos + 17);
 514
 515 #ifdef CONFIG_WPS
 516         if (os_strncmp(pos, "uuid=", 5) == 0)
 517                 return wpa_config_process_uuid(config, line, pos + 5);
 518 #endif /* CONFIG_WPS */
 519
 520         if (os_strncmp(pos, "country=", 8) == 0)
 521                 return wpa_config_process_country(config, pos + 8);
 522
 523         return -1;
 524 }
 525
 526
 527 struct wpa_config * wpa_config_read(const char *name)
 528 {
 529         FILE *f;
 530         char buf[256], *pos;
 531         int errors = 0, line = 0;
 532         struct wpa_ssid *ssid, *tail = NULL, *head = NULL;
 533         struct wpa_config *config;
 534         int id = 0;
 535
 536         config = wpa_config_alloc_empty(NULL, NULL);
 537         if (config == NULL)
 538                 return NULL;
 539         wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name);
 540         f = fopen(name, "r");
 541         if (f == NULL) {
 542                 os_free(config);
 543                 return NULL;
 544         }
 545
 546         while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
 547                 if (os_strcmp(pos, "network={") == 0) {
 548                         ssid = wpa_config_read_network(f, &line, id++);
 549                         if (ssid == NULL) {
 550                                 wpa_printf(MSG_ERROR, "Line %d: failed to "
 551                                            "parse network block.", line);
 552                                 errors++;
 553                                 continue;
 554                         }
 555                         if (head == NULL) {
 556                                 head = tail = ssid;
 557                         } else {
 558                                 tail->next = ssid;
 559                                 tail = ssid;
 560                         }
 561                         if (wpa_config_add_prio_network(config, ssid)) {
 562                                 wpa_printf(MSG_ERROR, "Line %d: failed to add "
 563                                            "network block to priority list.",
 564                                            line);
 565                                 errors++;
 566                                 continue;
 567                         }
 568 #ifndef CONFIG_NO_CONFIG_BLOBS
 569                 } else if (os_strncmp(pos, "blob-base64-", 12) == 0) {
 570                         if (wpa_config_process_blob(config, f, &line, pos + 12)
 571                             < 0) {
 572                                 errors++;
 573                                 continue;
 574                         }
 575 #endif /* CONFIG_NO_CONFIG_BLOBS */
 576                 } else if (wpa_config_process_global(config, pos, line) < 0) {
 577                         wpa_printf(MSG_ERROR, "Line %d: Invalid configuration "
 578                                    "line '%s'.", line, pos);
 579                         errors++;
 580                         continue;
 581                 }
 582         }
 583
 584         fclose(f);
 585
 586         config->ssid = head;
 587         wpa_config_debug_dump_networks(config);
 588
 589         if (errors) {
 590                 wpa_config_free(config);
 591                 config = NULL;
 592                 head = NULL;
 593         }
 594
 595         return config;
 596 }
 597
 598
 599 #ifndef CONFIG_NO_CONFIG_WRITE
 600
 601 static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
 602 {
 603         char *value = wpa_config_get(ssid, field);
 604         if (value == NULL)
 605                 return;
 606         fprintf(f, "\t%s=%s\n", field, value);
 607         os_free(value);
 608 }
 609
 610
 611 static void write_int(FILE *f, const char *field, int value, int def)
 612 {
 613         if (value == def)
 614                 return;
 615         fprintf(f, "\t%s=%d\n", field, value);
 616 }
 617
 618
 619 static void write_bssid(FILE *f, struct wpa_ssid *ssid)
 620 {
 621         char *value = wpa_config_get(ssid, "bssid");
 622         if (value == NULL)
 623                 return;
 624         fprintf(f, "\tbssid=%s\n", value);
 625         os_free(value);
 626 }
 627
 628
 629 static void write_psk(FILE *f, struct wpa_ssid *ssid)
 630 {
 631         char *value = wpa_config_get(ssid, "psk");
 632         if (value == NULL)
 633                 return;
 634         fprintf(f, "\tpsk=%s\n", value);
 635         os_free(value);
 636 }
 637
 638
 639 static void write_proto(FILE *f, struct wpa_ssid *ssid)
 640 {
 641         char *value;
 642
 643         if (ssid->proto == DEFAULT_PROTO)
 644                 return;
 645
 646         value = wpa_config_get(ssid, "proto");
 647         if (value == NULL)
 648                 return;
 649         if (value[0])
 650                 fprintf(f, "\tproto=%s\n", value);
 651         os_free(value);
 652 }
 653
 654
 655 static void write_key_mgmt(FILE *f, struct wpa_ssid *ssid)
 656 {
 657         char *value;
 658
 659         if (ssid->key_mgmt == DEFAULT_KEY_MGMT)
 660                 return;
 661
 662         value = wpa_config_get(ssid, "key_mgmt");
 663         if (value == NULL)
 664                 return;
 665         if (value[0])
 666                 fprintf(f, "\tkey_mgmt=%s\n", value);
 667         os_free(value);
 668 }
 669
 670
 671 static void write_pairwise(FILE *f, struct wpa_ssid *ssid)
 672 {
 673         char *value;
 674
 675         if (ssid->pairwise_cipher == DEFAULT_PAIRWISE)
 676                 return;
 677
 678         value = wpa_config_get(ssid, "pairwise");
 679         if (value == NULL)
 680                 return;
 681         if (value[0])
 682                 fprintf(f, "\tpairwise=%s\n", value);
 683         os_free(value);
 684 }
 685
 686
 687 static void write_group(FILE *f, struct wpa_ssid *ssid)
 688 {
 689         char *value;
 690
 691         if (ssid->group_cipher == DEFAULT_GROUP)
 692                 return;
 693
 694         value = wpa_config_get(ssid, "group");
 695         if (value == NULL)
 696                 return;
 697         if (value[0])
 698                 fprintf(f, "\tgroup=%s\n", value);
 699         os_free(value);
 700 }
 701
 702
 703 static void write_auth_alg(FILE *f, struct wpa_ssid *ssid)
 704 {
 705         char *value;
 706
 707         if (ssid->auth_alg == 0)
 708                 return;
 709
 710         value = wpa_config_get(ssid, "auth_alg");
 711         if (value == NULL)
 712                 return;
 713         if (value[0])
 714                 fprintf(f, "\tauth_alg=%s\n", value);
 715         os_free(value);
 716 }
 717
 718
 719 #ifdef IEEE8021X_EAPOL
 720 static void write_eap(FILE *f, struct wpa_ssid *ssid)
 721 {
 722         char *value;
 723
 724         value = wpa_config_get(ssid, "eap");
 725         if (value == NULL)
 726                 return;
 727
 728         if (value[0])
 729                 fprintf(f, "\teap=%s\n", value);
 730         os_free(value);
 731 }
 732 #endif /* IEEE8021X_EAPOL */
 733
 734
 735 static void write_wep_key(FILE *f, int idx, struct wpa_ssid *ssid)
 736 {
 737         char field[20], *value;
 738         int res;
 739
 740         res = os_snprintf(field, sizeof(field), "wep_key%d", idx);
 741         if (res < 0 || (size_t) res >= sizeof(field))
 742                 return;
 743         value = wpa_config_get(ssid, field);
 744         if (value) {
 745                 fprintf(f, "\t%s=%s\n", field, value);
 746                 os_free(value);
 747         }
 748 }
 749
 750
 751 static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 752 {
 753         int i;
 754
 755 #define STR(t) write_str(f, #t, ssid)
 756 #define INT(t) write_int(f, #t, ssid->t, 0)
 757 #define INTe(t) write_int(f, #t, ssid->eap.t, 0)
 758 #define INT_DEF(t, def) write_int(f, #t, ssid->t, def)
 759 #define INT_DEFe(t, def) write_int(f, #t, ssid->eap.t, def)
 760
 761         STR(ssid);
 762         INT(scan_ssid);
 763         write_bssid(f, ssid);
 764         write_psk(f, ssid);
 765         write_proto(f, ssid);
 766         write_key_mgmt(f, ssid);
 767         write_pairwise(f, ssid);
 768         write_group(f, ssid);
 769         write_auth_alg(f, ssid);
 770 #ifdef IEEE8021X_EAPOL
 771         write_eap(f, ssid);
 772         STR(identity);
 773         STR(anonymous_identity);
 774         STR(password);
 775         STR(ca_cert);
 776         STR(ca_path);
 777         STR(client_cert);
 778         STR(private_key);
 779         STR(private_key_passwd);
 780         STR(dh_file);
 781         STR(subject_match);
 782         STR(altsubject_match);
 783         STR(ca_cert2);
 784         STR(ca_path2);
 785         STR(client_cert2);
 786         STR(private_key2);
 787         STR(private_key2_passwd);
 788         STR(dh_file2);
 789         STR(subject_match2);
 790         STR(altsubject_match2);
 791         STR(phase1);
 792         STR(phase2);
 793         STR(pcsc);
 794         STR(pin);
 795         STR(engine_id);
 796         STR(key_id);
 797         STR(cert_id);
 798         STR(ca_cert_id);
 799         STR(key2_id);
 800         STR(pin2);
 801         STR(engine2_id);
 802         STR(cert2_id);
 803         STR(ca_cert2_id);
 804         INTe(engine);
 805         INTe(engine2);
 806         INT_DEF(eapol_flags, DEFAULT_EAPOL_FLAGS);
 807 #endif /* IEEE8021X_EAPOL */
 808         for (i = 0; i < 4; i++)
 809                 write_wep_key(f, i, ssid);
 810         INT(wep_tx_keyidx);
 811         INT(priority);
 812 #ifdef IEEE8021X_EAPOL
 813         INT_DEF(eap_workaround, DEFAULT_EAP_WORKAROUND);
 814         STR(pac_file);
 815         INT_DEFe(fragment_size, DEFAULT_FRAGMENT_SIZE);
 816 #endif /* IEEE8021X_EAPOL */
 817         INT(mode);
 818         INT(proactive_key_caching);
 819         INT(disabled);
 820         INT(peerkey);
 821 #ifdef CONFIG_IEEE80211W
 822         INT(ieee80211w);
 823 #endif /* CONFIG_IEEE80211W */
 824         STR(id_str);
 825
 826 #undef STR
 827 #undef INT
 828 #undef INT_DEF
 829 }
 830
 831
 832 #ifndef CONFIG_NO_CONFIG_BLOBS
 833 static int wpa_config_write_blob(FILE *f, struct wpa_config_blob *blob)
 834 {
 835         unsigned char *encoded;
 836
 837         encoded = base64_encode(blob->data, blob->len, NULL);
 838         if (encoded == NULL)
 839                 return -1;
 840
 841         fprintf(f, "\nblob-base64-%s={\n%s}\n", blob->name, encoded);
 842         os_free(encoded);
 843         return 0;
 844 }
 845 #endif /* CONFIG_NO_CONFIG_BLOBS */
 846
 847
 848 static void wpa_config_write_global(FILE *f, struct wpa_config *config)
 849 {
 850 #ifdef CONFIG_CTRL_IFACE
 851         if (config->ctrl_interface)
 852                 fprintf(f, "ctrl_interface=%s\n", config->ctrl_interface);
 853         if (config->ctrl_interface_group)
 854                 fprintf(f, "ctrl_interface_group=%s\n",
 855                         config->ctrl_interface_group);
 856 #endif /* CONFIG_CTRL_IFACE */
 857         if (config->eapol_version != DEFAULT_EAPOL_VERSION)
 858                 fprintf(f, "eapol_version=%d\n", config->eapol_version);
 859         if (config->ap_scan != DEFAULT_AP_SCAN)
 860                 fprintf(f, "ap_scan=%d\n", config->ap_scan);
 861         if (config->fast_reauth != DEFAULT_FAST_REAUTH)
 862                 fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
 863 #ifdef EAP_TLS_OPENSSL
 864         if (config->opensc_engine_path)
 865                 fprintf(f, "opensc_engine_path=%s\n",
 866                         config->opensc_engine_path);
 867         if (config->pkcs11_engine_path)
 868                 fprintf(f, "pkcs11_engine_path=%s\n",
 869                         config->pkcs11_engine_path);
 870         if (config->pkcs11_module_path)
 871                 fprintf(f, "pkcs11_module_path=%s\n",
 872                         config->pkcs11_module_path);
 873 #endif /* EAP_TLS_OPENSSL */
 874         if (config->driver_param)
 875                 fprintf(f, "driver_param=%s\n", config->driver_param);
 876         if (config->dot11RSNAConfigPMKLifetime)
 877                 fprintf(f, "dot11RSNAConfigPMKLifetime=%d\n",
 878                         config->dot11RSNAConfigPMKLifetime);
 879         if (config->dot11RSNAConfigPMKReauthThreshold)
 880                 fprintf(f, "dot11RSNAConfigPMKReauthThreshold=%d\n",
 881                         config->dot11RSNAConfigPMKReauthThreshold);
 882         if (config->dot11RSNAConfigSATimeout)
 883                 fprintf(f, "dot11RSNAConfigSATimeout=%d\n",
 884                         config->dot11RSNAConfigSATimeout);
 885         if (config->update_config)
 886                 fprintf(f, "update_config=%d\n", config->update_config);
 887 #ifdef CONFIG_WPS
 888         if (is_nil_uuid(config->uuid)) {
 889                 char buf[40];
 890                 uuid_bin2str(config->uuid, buf, sizeof(buf));
 891                 fprintf(f, "uuid=%s\n", buf);
 892         }
 893 #endif /* CONFIG_WPS */
 894         if (config->alpha2[0] && config->alpha2[1]) {
 895                 fprintf(f, "country=%c%c\n",
 896                         config->alpha2[0], config->alpha2[1]);
 897         }
 898 }
 899
 900 #endif /* CONFIG_NO_CONFIG_WRITE */
 901
 902
 903 int wpa_config_write(const char *name, struct wpa_config *config)
 904 {
 905 #ifndef CONFIG_NO_CONFIG_WRITE
 906         FILE *f;
 907         struct wpa_ssid *ssid;
 908 #ifndef CONFIG_NO_CONFIG_BLOBS
 909         struct wpa_config_blob *blob;
 910 #endif /* CONFIG_NO_CONFIG_BLOBS */
 911         int ret = 0;
 912
 913         wpa_printf(MSG_DEBUG, "Writing configuration file '%s'", name);
 914
 915         f = fopen(name, "w");
 916         if (f == NULL) {
 917                 wpa_printf(MSG_DEBUG, "Failed to open '%s' for writing", name);
 918                 return -1;
 919         }
 920
 921         wpa_config_write_global(f, config);
 922
 923         for (ssid = config->ssid; ssid; ssid = ssid->next) {
 924                 if (ssid->key_mgmt == WPA_KEY_MGMT_WPS)
 925                         continue; /* do not save temporary WPS networks */
 926                 fprintf(f, "\nnetwork={\n");
 927                 wpa_config_write_network(f, ssid);
 928                 fprintf(f, "}\n");
 929         }
 930
 931 #ifndef CONFIG_NO_CONFIG_BLOBS
 932         for (blob = config->blobs; blob; blob = blob->next) {
 933                 ret = wpa_config_write_blob(f, blob);
 934                 if (ret)
 935                         break;
 936         }
 937 #endif /* CONFIG_NO_CONFIG_BLOBS */
 938
 939         fclose(f);
 940
 941         wpa_printf(MSG_DEBUG, "Configuration file '%s' written %ssuccessfully",
 942                    name, ret ? "un" : "");
 943         return ret;
 944 #else /* CONFIG_NO_CONFIG_WRITE */
 945         return -1;
 946 #endif /* CONFIG_NO_CONFIG_WRITE */
 947 }