wpa_supplicant/interworking.c

   1 /*
   2  * Interworking (IEEE 802.11u)
   3  * Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
   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 "common/ieee802_11_defs.h"
  13 #include "common/gas.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "utils/pcsc_funcs.h"
  16 #include "drivers/driver.h"
  17 #include "eap_common/eap_defs.h"
  18 #include "eap_peer/eap.h"
  19 #include "eap_peer/eap_methods.h"
  20 #include "wpa_supplicant_i.h"
  21 #include "config.h"
  22 #include "config_ssid.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "notify.h"
  26 #include "gas_query.h"
  27 #include "hs20_supplicant.h"
  28 #include "interworking.h"
  29
  30
  31 #if defined(EAP_SIM) | defined(EAP_SIM_DYNAMIC)
  32 #define INTERWORKING_3GPP
  33 #else
  34 #if defined(EAP_AKA) | defined(EAP_AKA_DYNAMIC)
  35 #define INTERWORKING_3GPP
  36 #else
  37 #if defined(EAP_AKA_PRIME) | defined(EAP_AKA_PRIME_DYNAMIC)
  38 #define INTERWORKING_3GPP
  39 #endif
  40 #endif
  41 #endif
  42
  43 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);
  44
  45
  46 static void interworking_reconnect(struct wpa_supplicant *wpa_s)
  47 {
  48         if (wpa_s->wpa_state >= WPA_AUTHENTICATING) {
  49                 wpa_supplicant_cancel_sched_scan(wpa_s);
  50                 wpa_supplicant_deauthenticate(wpa_s,
  51                                               WLAN_REASON_DEAUTH_LEAVING);
  52         }
  53         wpa_s->disconnected = 0;
  54         wpa_s->reassociate = 1;
  55
  56         if (wpa_s->last_scan_res_used > 0) {
  57                 struct os_time now;
  58                 os_get_time(&now);
  59                 if (now.sec - wpa_s->last_scan.sec <= 5) {
  60                         wpa_printf(MSG_DEBUG, "Interworking: Old scan results "
  61                                    "are fresh - connect without new scan");
  62                         if (wpas_select_network_from_last_scan(wpa_s) >= 0)
  63                                 return;
  64                 }
  65         }
  66
  67         wpa_supplicant_req_scan(wpa_s, 0, 0);
  68 }
  69
  70
  71 static struct wpabuf * anqp_build_req(u16 info_ids[], size_t num_ids,
  72                                       struct wpabuf *extra)
  73 {
  74         struct wpabuf *buf;
  75         size_t i;
  76         u8 *len_pos;
  77
  78         buf = gas_anqp_build_initial_req(0, 4 + num_ids * 2 +
  79                                          (extra ? wpabuf_len(extra) : 0));
  80         if (buf == NULL)
  81                 return NULL;
  82
  83         len_pos = gas_anqp_add_element(buf, ANQP_QUERY_LIST);
  84         for (i = 0; i < num_ids; i++)
  85                 wpabuf_put_le16(buf, info_ids[i]);
  86         gas_anqp_set_element_len(buf, len_pos);
  87         if (extra)
  88                 wpabuf_put_buf(buf, extra);
  89
  90         gas_anqp_set_len(buf);
  91
  92         return buf;
  93 }
  94
  95
  96 static void interworking_anqp_resp_cb(void *ctx, const u8 *dst,
  97                                       u8 dialog_token,
  98                                       enum gas_query_result result,
  99                                       const struct wpabuf *adv_proto,
 100                                       const struct wpabuf *resp,
 101                                       u16 status_code)
 102 {
 103         struct wpa_supplicant *wpa_s = ctx;
 104
 105         anqp_resp_cb(wpa_s, dst, dialog_token, result, adv_proto, resp,
 106                      status_code);
 107         interworking_next_anqp_fetch(wpa_s);
 108 }
 109
 110
 111 static int cred_with_roaming_consortium(struct wpa_supplicant *wpa_s)
 112 {
 113         struct wpa_cred *cred;
 114
 115         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 116                 if (cred->roaming_consortium_len)
 117                         return 1;
 118         }
 119         return 0;
 120 }
 121
 122
 123 static int cred_with_3gpp(struct wpa_supplicant *wpa_s)
 124 {
 125         struct wpa_cred *cred;
 126
 127         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 128                 if (cred->pcsc || cred->imsi)
 129                         return 1;
 130         }
 131         return 0;
 132 }
 133
 134
 135 static int cred_with_nai_realm(struct wpa_supplicant *wpa_s)
 136 {
 137         struct wpa_cred *cred;
 138
 139         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 140                 if (cred->pcsc || cred->imsi)
 141                         continue;
 142                 if (!cred->eap_method)
 143                         return 1;
 144                 if (cred->realm && cred->roaming_consortium_len == 0)
 145                         return 1;
 146         }
 147         return 0;
 148 }
 149
 150
 151 static int cred_with_domain(struct wpa_supplicant *wpa_s)
 152 {
 153         struct wpa_cred *cred;
 154
 155         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 156                 if (cred->domain || cred->pcsc || cred->imsi)
 157                         return 1;
 158         }
 159         return 0;
 160 }
 161
 162
 163 static int additional_roaming_consortiums(struct wpa_bss *bss)
 164 {
 165         const u8 *ie;
 166         ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
 167         if (ie == NULL || ie[1] == 0)
 168                 return 0;
 169         return ie[2]; /* Number of ANQP OIs */
 170 }
 171
 172
 173 static int interworking_anqp_send_req(struct wpa_supplicant *wpa_s,
 174                                       struct wpa_bss *bss)
 175 {
 176         struct wpabuf *buf;
 177         int ret = 0;
 178         int res;
 179         u16 info_ids[8];
 180         size_t num_info_ids = 0;
 181         struct wpabuf *extra = NULL;
 182         int all = wpa_s->fetch_all_anqp;
 183
 184         wpa_printf(MSG_DEBUG, "Interworking: ANQP Query Request to " MACSTR,
 185                    MAC2STR(bss->bssid));
 186
 187         info_ids[num_info_ids++] = ANQP_CAPABILITY_LIST;
 188         if (all) {
 189                 info_ids[num_info_ids++] = ANQP_VENUE_NAME;
 190                 info_ids[num_info_ids++] = ANQP_NETWORK_AUTH_TYPE;
 191         }
 192         if (all || (cred_with_roaming_consortium(wpa_s) &&
 193                     additional_roaming_consortiums(bss)))
 194                 info_ids[num_info_ids++] = ANQP_ROAMING_CONSORTIUM;
 195         if (all)
 196                 info_ids[num_info_ids++] = ANQP_IP_ADDR_TYPE_AVAILABILITY;
 197         if (all || cred_with_nai_realm(wpa_s))
 198                 info_ids[num_info_ids++] = ANQP_NAI_REALM;
 199         if (all || cred_with_3gpp(wpa_s))
 200                 info_ids[num_info_ids++] = ANQP_3GPP_CELLULAR_NETWORK;
 201         if (all || cred_with_domain(wpa_s))
 202                 info_ids[num_info_ids++] = ANQP_DOMAIN_NAME;
 203         wpa_hexdump(MSG_DEBUG, "Interworking: ANQP Query info",
 204                     (u8 *) info_ids, num_info_ids * 2);
 205
 206 #ifdef CONFIG_HS20
 207         if (wpa_bss_get_vendor_ie(bss, HS20_IE_VENDOR_TYPE)) {
 208                 u8 *len_pos;
 209
 210                 extra = wpabuf_alloc(100);
 211                 if (!extra)
 212                         return -1;
 213
 214                 len_pos = gas_anqp_add_element(extra, ANQP_VENDOR_SPECIFIC);
 215                 wpabuf_put_be24(extra, OUI_WFA);
 216                 wpabuf_put_u8(extra, HS20_ANQP_OUI_TYPE);
 217                 wpabuf_put_u8(extra, HS20_STYPE_QUERY_LIST);
 218                 wpabuf_put_u8(extra, 0); /* Reserved */
 219                 wpabuf_put_u8(extra, HS20_STYPE_CAPABILITY_LIST);
 220                 if (all) {
 221                         wpabuf_put_u8(extra,
 222                                       HS20_STYPE_OPERATOR_FRIENDLY_NAME);
 223                         wpabuf_put_u8(extra, HS20_STYPE_WAN_METRICS);
 224                         wpabuf_put_u8(extra, HS20_STYPE_CONNECTION_CAPABILITY);
 225                         wpabuf_put_u8(extra, HS20_STYPE_OPERATING_CLASS);
 226                 }
 227                 gas_anqp_set_element_len(extra, len_pos);
 228         }
 229 #endif /* CONFIG_HS20 */
 230
 231         buf = anqp_build_req(info_ids, num_info_ids, extra);
 232         wpabuf_free(extra);
 233         if (buf == NULL)
 234                 return -1;
 235
 236         res = gas_query_req(wpa_s->gas, bss->bssid, bss->freq, buf,
 237                             interworking_anqp_resp_cb, wpa_s);
 238         if (res < 0) {
 239                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
 240                 ret = -1;
 241         } else
 242                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
 243                            "%u", res);
 244
 245         wpabuf_free(buf);
 246         return ret;
 247 }
 248
 249
 250 struct nai_realm_eap {
 251         u8 method;
 252         u8 inner_method;
 253         enum nai_realm_eap_auth_inner_non_eap inner_non_eap;
 254         u8 cred_type;
 255         u8 tunneled_cred_type;
 256 };
 257
 258 struct nai_realm {
 259         u8 encoding;
 260         char *realm;
 261         u8 eap_count;
 262         struct nai_realm_eap *eap;
 263 };
 264
 265
 266 static void nai_realm_free(struct nai_realm *realms, u16 count)
 267 {
 268         u16 i;
 269
 270         if (realms == NULL)
 271                 return;
 272         for (i = 0; i < count; i++) {
 273                 os_free(realms[i].eap);
 274                 os_free(realms[i].realm);
 275         }
 276         os_free(realms);
 277 }
 278
 279
 280 static const u8 * nai_realm_parse_eap(struct nai_realm_eap *e, const u8 *pos,
 281                                       const u8 *end)
 282 {
 283         u8 elen, auth_count, a;
 284         const u8 *e_end;
 285
 286         if (pos + 3 > end) {
 287                 wpa_printf(MSG_DEBUG, "No room for EAP Method fixed fields");
 288                 return NULL;
 289         }
 290
 291         elen = *pos++;
 292         if (pos + elen > end || elen < 2) {
 293                 wpa_printf(MSG_DEBUG, "No room for EAP Method subfield");
 294                 return NULL;
 295         }
 296         e_end = pos + elen;
 297         e->method = *pos++;
 298         auth_count = *pos++;
 299         wpa_printf(MSG_DEBUG, "EAP Method: len=%u method=%u auth_count=%u",
 300                    elen, e->method, auth_count);
 301
 302         for (a = 0; a < auth_count; a++) {
 303                 u8 id, len;
 304
 305                 if (pos + 2 > end || pos + 2 + pos[1] > end) {
 306                         wpa_printf(MSG_DEBUG, "No room for Authentication "
 307                                    "Parameter subfield");
 308                         return NULL;
 309                 }
 310
 311                 id = *pos++;
 312                 len = *pos++;
 313
 314                 switch (id) {
 315                 case NAI_REALM_EAP_AUTH_NON_EAP_INNER_AUTH:
 316                         if (len < 1)
 317                                 break;
 318                         e->inner_non_eap = *pos;
 319                         if (e->method != EAP_TYPE_TTLS)
 320                                 break;
 321                         switch (*pos) {
 322                         case NAI_REALM_INNER_NON_EAP_PAP:
 323                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP");
 324                                 break;
 325                         case NAI_REALM_INNER_NON_EAP_CHAP:
 326                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP");
 327                                 break;
 328                         case NAI_REALM_INNER_NON_EAP_MSCHAP:
 329                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP");
 330                                 break;
 331                         case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 332                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2");
 333                                 break;
 334                         }
 335                         break;
 336                 case NAI_REALM_EAP_AUTH_INNER_AUTH_EAP_METHOD:
 337                         if (len < 1)
 338                                 break;
 339                         e->inner_method = *pos;
 340                         wpa_printf(MSG_DEBUG, "Inner EAP method: %u",
 341                                    e->inner_method);
 342                         break;
 343                 case NAI_REALM_EAP_AUTH_CRED_TYPE:
 344                         if (len < 1)
 345                                 break;
 346                         e->cred_type = *pos;
 347                         wpa_printf(MSG_DEBUG, "Credential Type: %u",
 348                                    e->cred_type);
 349                         break;
 350                 case NAI_REALM_EAP_AUTH_TUNNELED_CRED_TYPE:
 351                         if (len < 1)
 352                                 break;
 353                         e->tunneled_cred_type = *pos;
 354                         wpa_printf(MSG_DEBUG, "Tunneled EAP Method Credential "
 355                                    "Type: %u", e->tunneled_cred_type);
 356                         break;
 357                 default:
 358                         wpa_printf(MSG_DEBUG, "Unsupported Authentication "
 359                                    "Parameter: id=%u len=%u", id, len);
 360                         wpa_hexdump(MSG_DEBUG, "Authentication Parameter "
 361                                     "Value", pos, len);
 362                         break;
 363                 }
 364
 365                 pos += len;
 366         }
 367
 368         return e_end;
 369 }
 370
 371
 372 static const u8 * nai_realm_parse_realm(struct nai_realm *r, const u8 *pos,
 373                                         const u8 *end)
 374 {
 375         u16 len;
 376         const u8 *f_end;
 377         u8 realm_len, e;
 378
 379         if (end - pos < 4) {
 380                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 381                            "fixed fields");
 382                 return NULL;
 383         }
 384
 385         len = WPA_GET_LE16(pos); /* NAI Realm Data field Length */
 386         pos += 2;
 387         if (pos + len > end || len < 3) {
 388                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 389                            "(len=%u; left=%u)",
 390                            len, (unsigned int) (end - pos));
 391                 return NULL;
 392         }
 393         f_end = pos + len;
 394
 395         r->encoding = *pos++;
 396         realm_len = *pos++;
 397         if (pos + realm_len > f_end) {
 398                 wpa_printf(MSG_DEBUG, "No room for NAI Realm "
 399                            "(len=%u; left=%u)",
 400                            realm_len, (unsigned int) (f_end - pos));
 401                 return NULL;
 402         }
 403         wpa_hexdump_ascii(MSG_DEBUG, "NAI Realm", pos, realm_len);
 404         r->realm = os_malloc(realm_len + 1);
 405         if (r->realm == NULL)
 406                 return NULL;
 407         os_memcpy(r->realm, pos, realm_len);
 408         r->realm[realm_len] = '\0';
 409         pos += realm_len;
 410
 411         if (pos + 1 > f_end) {
 412                 wpa_printf(MSG_DEBUG, "No room for EAP Method Count");
 413                 return NULL;
 414         }
 415         r->eap_count = *pos++;
 416         wpa_printf(MSG_DEBUG, "EAP Count: %u", r->eap_count);
 417         if (pos + r->eap_count * 3 > f_end) {
 418                 wpa_printf(MSG_DEBUG, "No room for EAP Methods");
 419                 return NULL;
 420         }
 421         r->eap = os_calloc(r->eap_count, sizeof(struct nai_realm_eap));
 422         if (r->eap == NULL)
 423                 return NULL;
 424
 425         for (e = 0; e < r->eap_count; e++) {
 426                 pos = nai_realm_parse_eap(&r->eap[e], pos, f_end);
 427                 if (pos == NULL)
 428                         return NULL;
 429         }
 430
 431         return f_end;
 432 }
 433
 434
 435 static struct nai_realm * nai_realm_parse(struct wpabuf *anqp, u16 *count)
 436 {
 437         struct nai_realm *realm;
 438         const u8 *pos, *end;
 439         u16 i, num;
 440
 441         if (anqp == NULL || wpabuf_len(anqp) < 2)
 442                 return NULL;
 443
 444         pos = wpabuf_head_u8(anqp);
 445         end = pos + wpabuf_len(anqp);
 446         num = WPA_GET_LE16(pos);
 447         wpa_printf(MSG_DEBUG, "NAI Realm Count: %u", num);
 448         pos += 2;
 449
 450         if (num * 5 > end - pos) {
 451                 wpa_printf(MSG_DEBUG, "Invalid NAI Realm Count %u - not "
 452                            "enough data (%u octets) for that many realms",
 453                            num, (unsigned int) (end - pos));
 454                 return NULL;
 455         }
 456
 457         realm = os_calloc(num, sizeof(struct nai_realm));
 458         if (realm == NULL)
 459                 return NULL;
 460
 461         for (i = 0; i < num; i++) {
 462                 pos = nai_realm_parse_realm(&realm[i], pos, end);
 463                 if (pos == NULL) {
 464                         nai_realm_free(realm, num);
 465                         return NULL;
 466                 }
 467         }
 468
 469         *count = num;
 470         return realm;
 471 }
 472
 473
 474 static int nai_realm_match(struct nai_realm *realm, const char *home_realm)
 475 {
 476         char *tmp, *pos, *end;
 477         int match = 0;
 478
 479         if (realm->realm == NULL || home_realm == NULL)
 480                 return 0;
 481
 482         if (os_strchr(realm->realm, ';') == NULL)
 483                 return os_strcasecmp(realm->realm, home_realm) == 0;
 484
 485         tmp = os_strdup(realm->realm);
 486         if (tmp == NULL)
 487                 return 0;
 488
 489         pos = tmp;
 490         while (*pos) {
 491                 end = os_strchr(pos, ';');
 492                 if (end)
 493                         *end = '\0';
 494                 if (os_strcasecmp(pos, home_realm) == 0) {
 495                         match = 1;
 496                         break;
 497                 }
 498                 if (end == NULL)
 499                         break;
 500                 pos = end + 1;
 501         }
 502
 503         os_free(tmp);
 504
 505         return match;
 506 }
 507
 508
 509 static int nai_realm_cred_username(struct nai_realm_eap *eap)
 510 {
 511         if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL)
 512                 return 0; /* method not supported */
 513
 514         if (eap->method != EAP_TYPE_TTLS && eap->method != EAP_TYPE_PEAP) {
 515                 /* Only tunneled methods with username/password supported */
 516                 return 0;
 517         }
 518
 519         if (eap->method == EAP_TYPE_PEAP &&
 520             eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 521                 return 0;
 522
 523         if (eap->method == EAP_TYPE_TTLS) {
 524                 if (eap->inner_method == 0 && eap->inner_non_eap == 0)
 525                         return 0;
 526                 if (eap->inner_method &&
 527                     eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 528                         return 0;
 529                 if (eap->inner_non_eap &&
 530                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_PAP &&
 531                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_CHAP &&
 532                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAP &&
 533                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAPV2)
 534                         return 0;
 535         }
 536
 537         if (eap->inner_method &&
 538             eap->inner_method != EAP_TYPE_GTC &&
 539             eap->inner_method != EAP_TYPE_MSCHAPV2)
 540                 return 0;
 541
 542         return 1;
 543 }
 544
 545
 546 static int nai_realm_cred_cert(struct nai_realm_eap *eap)
 547 {
 548         if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL)
 549                 return 0; /* method not supported */
 550
 551         if (eap->method != EAP_TYPE_TLS) {
 552                 /* Only EAP-TLS supported for credential authentication */
 553                 return 0;
 554         }
 555
 556         return 1;
 557 }
 558
 559
 560 static struct nai_realm_eap * nai_realm_find_eap(struct wpa_cred *cred,
 561                                                  struct nai_realm *realm)
 562 {
 563         u8 e;
 564
 565         if (cred == NULL ||
 566             cred->username == NULL ||
 567             cred->username[0] == '\0' ||
 568             ((cred->password == NULL ||
 569               cred->password[0] == '\0') &&
 570              (cred->private_key == NULL ||
 571               cred->private_key[0] == '\0')))
 572                 return NULL;
 573
 574         for (e = 0; e < realm->eap_count; e++) {
 575                 struct nai_realm_eap *eap = &realm->eap[e];
 576                 if (cred->password && cred->password[0] &&
 577                     nai_realm_cred_username(eap))
 578                         return eap;
 579                 if (cred->private_key && cred->private_key[0] &&
 580                     nai_realm_cred_cert(eap))
 581                         return eap;
 582         }
 583
 584         return NULL;
 585 }
 586
 587
 588 #ifdef INTERWORKING_3GPP
 589
 590 static int plmn_id_match(struct wpabuf *anqp, const char *imsi, int mnc_len)
 591 {
 592         u8 plmn[3];
 593         const u8 *pos, *end;
 594         u8 udhl;
 595
 596         /* See Annex A of 3GPP TS 24.234 v8.1.0 for description */
 597         plmn[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
 598         plmn[1] = imsi[2] - '0';
 599         /* default to MNC length 3 if unknown */
 600         if (mnc_len != 2)
 601                 plmn[1] |= (imsi[5] - '0') << 4;
 602         else
 603                 plmn[1] |= 0xf0;
 604         plmn[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);
 605
 606         if (anqp == NULL)
 607                 return 0;
 608         pos = wpabuf_head_u8(anqp);
 609         end = pos + wpabuf_len(anqp);
 610         if (pos + 2 > end)
 611                 return 0;
 612         if (*pos != 0) {
 613                 wpa_printf(MSG_DEBUG, "Unsupported GUD version 0x%x", *pos);
 614                 return 0;
 615         }
 616         pos++;
 617         udhl = *pos++;
 618         if (pos + udhl > end) {
 619                 wpa_printf(MSG_DEBUG, "Invalid UDHL");
 620                 return 0;
 621         }
 622         end = pos + udhl;
 623
 624         while (pos + 2 <= end) {
 625                 u8 iei, len;
 626                 const u8 *l_end;
 627                 iei = *pos++;
 628                 len = *pos++ & 0x7f;
 629                 if (pos + len > end)
 630                         break;
 631                 l_end = pos + len;
 632
 633                 if (iei == 0 && len > 0) {
 634                         /* PLMN List */
 635                         u8 num, i;
 636                         num = *pos++;
 637                         for (i = 0; i < num; i++) {
 638                                 if (pos + 3 > end)
 639                                         break;
 640                                 if (os_memcmp(pos, plmn, 3) == 0)
 641                                         return 1; /* Found matching PLMN */
 642                                 pos += 3;
 643                         }
 644                 }
 645
 646                 pos = l_end;
 647         }
 648
 649         return 0;
 650 }
 651
 652
 653 static int build_root_nai(char *nai, size_t nai_len, const char *imsi,
 654                           size_t mnc_len, char prefix)
 655 {
 656         const char *sep, *msin;
 657         char *end, *pos;
 658         size_t msin_len, plmn_len;
 659
 660         /*
 661          * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
 662          * Root NAI:
 663          * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
 664          * <MNC> is zero-padded to three digits in case two-digit MNC is used
 665          */
 666
 667         if (imsi == NULL || os_strlen(imsi) > 16) {
 668                 wpa_printf(MSG_DEBUG, "No valid IMSI available");
 669                 return -1;
 670         }
 671         sep = os_strchr(imsi, '-');
 672         if (sep) {
 673                 plmn_len = sep - imsi;
 674                 msin = sep + 1;
 675         } else if (mnc_len && os_strlen(imsi) >= 3 + mnc_len) {
 676                 plmn_len = 3 + mnc_len;
 677                 msin = imsi + plmn_len;
 678         } else
 679                 return -1;
 680         if (plmn_len != 5 && plmn_len != 6)
 681                 return -1;
 682         msin_len = os_strlen(msin);
 683
 684         pos = nai;
 685         end = nai + nai_len;
 686         if (prefix)
 687                 *pos++ = prefix;
 688         os_memcpy(pos, imsi, plmn_len);
 689         pos += plmn_len;
 690         os_memcpy(pos, msin, msin_len);
 691         pos += msin_len;
 692         pos += os_snprintf(pos, end - pos, "@wlan.mnc");
 693         if (plmn_len == 5) {
 694                 *pos++ = '0';
 695                 *pos++ = imsi[3];
 696                 *pos++ = imsi[4];
 697         } else {
 698                 *pos++ = imsi[3];
 699                 *pos++ = imsi[4];
 700                 *pos++ = imsi[5];
 701         }
 702         pos += os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
 703                            imsi[0], imsi[1], imsi[2]);
 704
 705         return 0;
 706 }
 707
 708
 709 static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
 710 {
 711         char nai[100];
 712         if (build_root_nai(nai, sizeof(nai), imsi, 0, prefix) < 0)
 713                 return -1;
 714         return wpa_config_set_quoted(ssid, "identity", nai);
 715 }
 716
 717 #endif /* INTERWORKING_3GPP */
 718
 719
 720 static int interworking_set_hs20_params(struct wpa_supplicant *wpa_s,
 721                                         struct wpa_ssid *ssid)
 722 {
 723         if (wpa_config_set(ssid, "key_mgmt",
 724                            wpa_s->conf->pmf != NO_MGMT_FRAME_PROTECTION ?
 725                            "WPA-EAP WPA-EAP-SHA256" : "WPA-EAP", 0) < 0)
 726                 return -1;
 727         if (wpa_config_set(ssid, "proto", "RSN", 0) < 0)
 728                 return -1;
 729         if (wpa_config_set(ssid, "pairwise", "CCMP", 0) < 0)
 730                 return -1;
 731         return 0;
 732 }
 733
 734
 735 static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
 736                                      struct wpa_bss *bss)
 737 {
 738 #ifdef INTERWORKING_3GPP
 739         struct wpa_cred *cred;
 740         struct wpa_ssid *ssid;
 741         const u8 *ie;
 742         int eap_type;
 743         int res;
 744         char prefix;
 745
 746         if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL)
 747                 return -1;
 748
 749         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 750                 char *sep;
 751                 const char *imsi;
 752                 int mnc_len;
 753
 754 #ifdef PCSC_FUNCS
 755                 if (cred->pcsc && wpa_s->conf->pcsc_reader && wpa_s->scard &&
 756                     wpa_s->imsi[0]) {
 757                         imsi = wpa_s->imsi;
 758                         mnc_len = wpa_s->mnc_len;
 759                         goto compare;
 760                 }
 761 #endif /* PCSC_FUNCS */
 762
 763                 if (cred->imsi == NULL || !cred->imsi[0] ||
 764                     cred->milenage == NULL || !cred->milenage[0])
 765                         continue;
 766
 767                 sep = os_strchr(cred->imsi, '-');
 768                 if (sep == NULL ||
 769                     (sep - cred->imsi != 5 && sep - cred->imsi != 6))
 770                         continue;
 771                 mnc_len = sep - cred->imsi - 3;
 772                 imsi = cred->imsi;
 773
 774 #ifdef PCSC_FUNCS
 775         compare:
 776 #endif /* PCSC_FUNCS */
 777                 if (plmn_id_match(bss->anqp->anqp_3gpp, imsi, mnc_len))
 778                         break;
 779         }
 780         if (cred == NULL)
 781                 return -1;
 782
 783         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 784         if (ie == NULL)
 785                 return -1;
 786         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " (3GPP)",
 787                    MAC2STR(bss->bssid));
 788
 789         ssid = wpa_config_add_network(wpa_s->conf);
 790         if (ssid == NULL)
 791                 return -1;
 792         ssid->parent_cred = cred;
 793
 794         wpas_notify_network_added(wpa_s, ssid);
 795         wpa_config_set_network_defaults(ssid);
 796         ssid->priority = cred->priority;
 797         ssid->temporary = 1;
 798         ssid->ssid = os_zalloc(ie[1] + 1);
 799         if (ssid->ssid == NULL)
 800                 goto fail;
 801         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 802         ssid->ssid_len = ie[1];
 803
 804         if (interworking_set_hs20_params(wpa_s, ssid) < 0)
 805                 goto fail;
 806
 807         eap_type = EAP_TYPE_SIM;
 808         if (cred->pcsc && wpa_s->scard && scard_supports_umts(wpa_s->scard))
 809                 eap_type = EAP_TYPE_AKA;
 810         if (cred->eap_method && cred->eap_method[0].vendor == EAP_VENDOR_IETF) {
 811                 if (cred->eap_method[0].method == EAP_TYPE_SIM ||
 812                     cred->eap_method[0].method == EAP_TYPE_AKA ||
 813                     cred->eap_method[0].method == EAP_TYPE_AKA_PRIME)
 814                         eap_type = cred->eap_method[0].method;
 815         }
 816
 817         switch (eap_type) {
 818         case EAP_TYPE_SIM:
 819                 prefix = '1';
 820                 res = wpa_config_set(ssid, "eap", "SIM", 0);
 821                 break;
 822         case EAP_TYPE_AKA:
 823                 prefix = '0';
 824                 res = wpa_config_set(ssid, "eap", "AKA", 0);
 825                 break;
 826         case EAP_TYPE_AKA_PRIME:
 827                 prefix = '6';
 828                 res = wpa_config_set(ssid, "eap", "AKA'", 0);
 829                 break;
 830         default:
 831                 res = -1;
 832                 break;
 833         }
 834         if (res < 0) {
 835                 wpa_printf(MSG_DEBUG, "Selected EAP method (%d) not supported",
 836                            eap_type);
 837                 goto fail;
 838         }
 839
 840         if (!cred->pcsc && set_root_nai(ssid, cred->imsi, prefix) < 0) {
 841                 wpa_printf(MSG_DEBUG, "Failed to set Root NAI");
 842                 goto fail;
 843         }
 844
 845         if (cred->milenage && cred->milenage[0]) {
 846                 if (wpa_config_set_quoted(ssid, "password",
 847                                           cred->milenage) < 0)
 848                         goto fail;
 849         } else if (cred->pcsc) {
 850                 if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
 851                         goto fail;
 852                 if (wpa_s->conf->pcsc_pin &&
 853                     wpa_config_set_quoted(ssid, "pin", wpa_s->conf->pcsc_pin)
 854                     < 0)
 855                         goto fail;
 856         }
 857
 858         if (cred->password && cred->password[0] &&
 859             wpa_config_set_quoted(ssid, "password", cred->password) < 0)
 860                 goto fail;
 861
 862         wpa_config_update_prio_list(wpa_s->conf);
 863         interworking_reconnect(wpa_s);
 864
 865         return 0;
 866
 867 fail:
 868         wpas_notify_network_removed(wpa_s, ssid);
 869         wpa_config_remove_network(wpa_s->conf, ssid->id);
 870 #endif /* INTERWORKING_3GPP */
 871         return -1;
 872 }
 873
 874
 875 static int roaming_consortium_element_match(const u8 *ie, const u8 *rc_id,
 876                                             size_t rc_len)
 877 {
 878         const u8 *pos, *end;
 879         u8 lens;
 880
 881         if (ie == NULL)
 882                 return 0;
 883
 884         pos = ie + 2;
 885         end = ie + 2 + ie[1];
 886
 887         /* Roaming Consortium element:
 888          * Number of ANQP OIs
 889          * OI #1 and #2 lengths
 890          * OI #1, [OI #2], [OI #3]
 891          */
 892
 893         if (pos + 2 > end)
 894                 return 0;
 895
 896         pos++; /* skip Number of ANQP OIs */
 897         lens = *pos++;
 898         if (pos + (lens & 0x0f) + (lens >> 4) > end)
 899                 return 0;
 900
 901         if ((lens & 0x0f) == rc_len && os_memcmp(pos, rc_id, rc_len) == 0)
 902                 return 1;
 903         pos += lens & 0x0f;
 904
 905         if ((lens >> 4) == rc_len && os_memcmp(pos, rc_id, rc_len) == 0)
 906                 return 1;
 907         pos += lens >> 4;
 908
 909         if (pos < end && (size_t) (end - pos) == rc_len &&
 910             os_memcmp(pos, rc_id, rc_len) == 0)
 911                 return 1;
 912
 913         return 0;
 914 }
 915
 916
 917 static int roaming_consortium_anqp_match(const struct wpabuf *anqp,
 918                                          const u8 *rc_id, size_t rc_len)
 919 {
 920         const u8 *pos, *end;
 921         u8 len;
 922
 923         if (anqp == NULL)
 924                 return 0;
 925
 926         pos = wpabuf_head(anqp);
 927         end = pos + wpabuf_len(anqp);
 928
 929         /* Set of <OI Length, OI> duples */
 930         while (pos < end) {
 931                 len = *pos++;
 932                 if (pos + len > end)
 933                         break;
 934                 if (len == rc_len && os_memcmp(pos, rc_id, rc_len) == 0)
 935                         return 1;
 936                 pos += len;
 937         }
 938
 939         return 0;
 940 }
 941
 942
 943 static int roaming_consortium_match(const u8 *ie, const struct wpabuf *anqp,
 944                                     const u8 *rc_id, size_t rc_len)
 945 {
 946         return roaming_consortium_element_match(ie, rc_id, rc_len) ||
 947                 roaming_consortium_anqp_match(anqp, rc_id, rc_len);
 948 }
 949
 950
 951 static struct wpa_cred * interworking_credentials_available_roaming_consortium(
 952         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 953 {
 954         struct wpa_cred *cred, *selected = NULL;
 955         const u8 *ie;
 956
 957         ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
 958
 959         if (ie == NULL &&
 960             (bss->anqp == NULL || bss->anqp->roaming_consortium == NULL))
 961                 return NULL;
 962
 963         if (wpa_s->conf->cred == NULL)
 964                 return NULL;
 965
 966         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 967                 if (cred->roaming_consortium_len == 0)
 968                         continue;
 969
 970                 if (!roaming_consortium_match(ie,
 971                                               bss->anqp ?
 972                                               bss->anqp->roaming_consortium :
 973                                               NULL,
 974                                               cred->roaming_consortium,
 975                                               cred->roaming_consortium_len))
 976                         continue;
 977
 978                 if (selected == NULL ||
 979                     selected->priority < cred->priority)
 980                         selected = cred;
 981         }
 982
 983         return selected;
 984 }
 985
 986
 987 static int interworking_set_eap_params(struct wpa_ssid *ssid,
 988                                        struct wpa_cred *cred, int ttls)
 989 {
 990         if (cred->eap_method) {
 991                 ttls = cred->eap_method->vendor == EAP_VENDOR_IETF &&
 992                         cred->eap_method->method == EAP_TYPE_TTLS;
 993
 994                 os_free(ssid->eap.eap_methods);
 995                 ssid->eap.eap_methods =
 996                         os_malloc(sizeof(struct eap_method_type) * 2);
 997                 if (ssid->eap.eap_methods == NULL)
 998                         return -1;
 999                 os_memcpy(ssid->eap.eap_methods, cred->eap_method,
1000                           sizeof(*cred->eap_method));
1001                 ssid->eap.eap_methods[1].vendor = EAP_VENDOR_IETF;
1002                 ssid->eap.eap_methods[1].method = EAP_TYPE_NONE;
1003         }
1004
1005         if (ttls && cred->username && cred->username[0]) {
1006                 const char *pos;
1007                 char *anon;
1008                 /* Use anonymous NAI in Phase 1 */
1009                 pos = os_strchr(cred->username, '@');
1010                 if (pos) {
1011                         size_t buflen = 9 + os_strlen(pos) + 1;
1012                         anon = os_malloc(buflen);
1013                         if (anon == NULL)
1014                                 return -1;
1015                         os_snprintf(anon, buflen, "anonymous%s", pos);
1016                 } else if (cred->realm) {
1017                         size_t buflen = 10 + os_strlen(cred->realm) + 1;
1018                         anon = os_malloc(buflen);
1019                         if (anon == NULL)
1020                                 return -1;
1021                         os_snprintf(anon, buflen, "anonymous@%s", cred->realm);
1022                 } else {
1023                         anon = os_strdup("anonymous");
1024                         if (anon == NULL)
1025                                 return -1;
1026                 }
1027                 if (wpa_config_set_quoted(ssid, "anonymous_identity", anon) <
1028                     0) {
1029                         os_free(anon);
1030                         return -1;
1031                 }
1032                 os_free(anon);
1033         }
1034
1035         if (cred->username && cred->username[0] &&
1036             wpa_config_set_quoted(ssid, "identity", cred->username) < 0)
1037                 return -1;
1038
1039         if (cred->password && cred->password[0]) {
1040                 if (cred->ext_password &&
1041                     wpa_config_set(ssid, "password", cred->password, 0) < 0)
1042                         return -1;
1043                 if (!cred->ext_password &&
1044                     wpa_config_set_quoted(ssid, "password", cred->password) <
1045                     0)
1046                         return -1;
1047         }
1048
1049         if (cred->client_cert && cred->client_cert[0] &&
1050             wpa_config_set_quoted(ssid, "client_cert", cred->client_cert) < 0)
1051                 return -1;
1052
1053 #ifdef ANDROID
1054         if (cred->private_key &&
1055             os_strncmp(cred->private_key, "keystore://", 11) == 0) {
1056                 /* Use OpenSSL engine configuration for Android keystore */
1057                 if (wpa_config_set_quoted(ssid, "engine_id", "keystore") < 0 ||
1058                     wpa_config_set_quoted(ssid, "key_id",
1059                                           cred->private_key + 11) < 0 ||
1060                     wpa_config_set(ssid, "engine", "1", 0) < 0)
1061                         return -1;
1062         } else
1063 #endif /* ANDROID */
1064         if (cred->private_key && cred->private_key[0] &&
1065             wpa_config_set_quoted(ssid, "private_key", cred->private_key) < 0)
1066                 return -1;
1067
1068         if (cred->private_key_passwd && cred->private_key_passwd[0] &&
1069             wpa_config_set_quoted(ssid, "private_key_passwd",
1070                                   cred->private_key_passwd) < 0)
1071                 return -1;
1072
1073         if (cred->phase1) {
1074                 os_free(ssid->eap.phase1);
1075                 ssid->eap.phase1 = os_strdup(cred->phase1);
1076         }
1077         if (cred->phase2) {
1078                 os_free(ssid->eap.phase2);
1079                 ssid->eap.phase2 = os_strdup(cred->phase2);
1080         }
1081
1082         if (cred->ca_cert && cred->ca_cert[0] &&
1083             wpa_config_set_quoted(ssid, "ca_cert", cred->ca_cert) < 0)
1084                 return -1;
1085
1086         return 0;
1087 }
1088
1089
1090 static int interworking_connect_roaming_consortium(
1091         struct wpa_supplicant *wpa_s, struct wpa_cred *cred,
1092         struct wpa_bss *bss, const u8 *ssid_ie)
1093 {
1094         struct wpa_ssid *ssid;
1095
1096         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " based on "
1097                    "roaming consortium match", MAC2STR(bss->bssid));
1098
1099         ssid = wpa_config_add_network(wpa_s->conf);
1100         if (ssid == NULL)
1101                 return -1;
1102         ssid->parent_cred = cred;
1103         wpas_notify_network_added(wpa_s, ssid);
1104         wpa_config_set_network_defaults(ssid);
1105         ssid->priority = cred->priority;
1106         ssid->temporary = 1;
1107         ssid->ssid = os_zalloc(ssid_ie[1] + 1);
1108         if (ssid->ssid == NULL)
1109                 goto fail;
1110         os_memcpy(ssid->ssid, ssid_ie + 2, ssid_ie[1]);
1111         ssid->ssid_len = ssid_ie[1];
1112
1113         if (interworking_set_hs20_params(wpa_s, ssid) < 0)
1114                 goto fail;
1115
1116         if (cred->eap_method == NULL) {
1117                 wpa_printf(MSG_DEBUG, "Interworking: No EAP method set for "
1118                            "credential using roaming consortium");
1119                 goto fail;
1120         }
1121
1122         if (interworking_set_eap_params(
1123                     ssid, cred,
1124                     cred->eap_method->vendor == EAP_VENDOR_IETF &&
1125                     cred->eap_method->method == EAP_TYPE_TTLS) < 0)
1126                 goto fail;
1127
1128         wpa_config_update_prio_list(wpa_s->conf);
1129         interworking_reconnect(wpa_s);
1130
1131         return 0;
1132
1133 fail:
1134         wpas_notify_network_removed(wpa_s, ssid);
1135         wpa_config_remove_network(wpa_s->conf, ssid->id);
1136         return -1;
1137 }
1138
1139
1140 int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1141 {
1142         struct wpa_cred *cred;
1143         struct wpa_ssid *ssid;
1144         struct nai_realm *realm;
1145         struct nai_realm_eap *eap = NULL;
1146         u16 count, i;
1147         char buf[100];
1148         const u8 *ie;
1149
1150         if (wpa_s->conf->cred == NULL || bss == NULL)
1151                 return -1;
1152         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
1153         if (ie == NULL || ie[1] == 0) {
1154                 wpa_printf(MSG_DEBUG, "Interworking: No SSID known for "
1155                            MACSTR, MAC2STR(bss->bssid));
1156                 return -1;
1157         }
1158
1159         if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
1160                 /*
1161                  * We currently support only HS 2.0 networks and those are
1162                  * required to use WPA2-Enterprise.
1163                  */
1164                 wpa_printf(MSG_DEBUG, "Interworking: Network does not use "
1165                            "RSN");
1166                 return -1;
1167         }
1168
1169         cred = interworking_credentials_available_roaming_consortium(wpa_s,
1170                                                                      bss);
1171         if (cred)
1172                 return interworking_connect_roaming_consortium(wpa_s, cred,
1173                                                                bss, ie);
1174
1175         realm = nai_realm_parse(bss->anqp ? bss->anqp->nai_realm : NULL,
1176                                 &count);
1177         if (realm == NULL) {
1178                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
1179                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
1180                 count = 0;
1181         }
1182
1183         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1184                 for (i = 0; i < count; i++) {
1185                         if (!nai_realm_match(&realm[i], cred->realm))
1186                                 continue;
1187                         eap = nai_realm_find_eap(cred, &realm[i]);
1188                         if (eap)
1189                                 break;
1190                 }
1191                 if (eap)
1192                         break;
1193         }
1194
1195         if (!eap) {
1196                 if (interworking_connect_3gpp(wpa_s, bss) == 0) {
1197                         if (realm)
1198                                 nai_realm_free(realm, count);
1199                         return 0;
1200                 }
1201
1202                 wpa_printf(MSG_DEBUG, "Interworking: No matching credentials "
1203                            "and EAP method found for " MACSTR,
1204                            MAC2STR(bss->bssid));
1205                 nai_realm_free(realm, count);
1206                 return -1;
1207         }
1208
1209         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR,
1210                    MAC2STR(bss->bssid));
1211
1212         ssid = wpa_config_add_network(wpa_s->conf);
1213         if (ssid == NULL) {
1214                 nai_realm_free(realm, count);
1215                 return -1;
1216         }
1217         ssid->parent_cred = cred;
1218         wpas_notify_network_added(wpa_s, ssid);
1219         wpa_config_set_network_defaults(ssid);
1220         ssid->priority = cred->priority;
1221         ssid->temporary = 1;
1222         ssid->ssid = os_zalloc(ie[1] + 1);
1223         if (ssid->ssid == NULL)
1224                 goto fail;
1225         os_memcpy(ssid->ssid, ie + 2, ie[1]);
1226         ssid->ssid_len = ie[1];
1227
1228         if (interworking_set_hs20_params(wpa_s, ssid) < 0)
1229                 goto fail;
1230
1231         if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
1232                                                      eap->method), 0) < 0)
1233                 goto fail;
1234
1235         switch (eap->method) {
1236         case EAP_TYPE_TTLS:
1237                 if (eap->inner_method) {
1238                         os_snprintf(buf, sizeof(buf), "\"autheap=%s\"",
1239                                     eap_get_name(EAP_VENDOR_IETF,
1240                                                  eap->inner_method));
1241                         if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
1242                                 goto fail;
1243                         break;
1244                 }
1245                 switch (eap->inner_non_eap) {
1246                 case NAI_REALM_INNER_NON_EAP_PAP:
1247                         if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
1248                             0)
1249                                 goto fail;
1250                         break;
1251                 case NAI_REALM_INNER_NON_EAP_CHAP:
1252                         if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
1253                             < 0)
1254                                 goto fail;
1255                         break;
1256                 case NAI_REALM_INNER_NON_EAP_MSCHAP:
1257                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAP\"",
1258                                            0) < 0)
1259                                 goto fail;
1260                         break;
1261                 case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
1262                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
1263                                            0) < 0)
1264                                 goto fail;
1265                         break;
1266                 }
1267                 break;
1268         case EAP_TYPE_PEAP:
1269                 os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
1270                             eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
1271                 if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
1272                         goto fail;
1273                 break;
1274         case EAP_TYPE_TLS:
1275                 break;
1276         }
1277
1278         if (interworking_set_eap_params(ssid, cred,
1279                                         eap->method == EAP_TYPE_TTLS) < 0)
1280                 goto fail;
1281
1282         nai_realm_free(realm, count);
1283
1284         wpa_config_update_prio_list(wpa_s->conf);
1285         interworking_reconnect(wpa_s);
1286
1287         return 0;
1288
1289 fail:
1290         wpas_notify_network_removed(wpa_s, ssid);
1291         wpa_config_remove_network(wpa_s->conf, ssid->id);
1292         nai_realm_free(realm, count);
1293         return -1;
1294 }
1295
1296
1297 static struct wpa_cred * interworking_credentials_available_3gpp(
1298         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1299 {
1300         struct wpa_cred *cred, *selected = NULL;
1301         int ret;
1302
1303 #ifdef INTERWORKING_3GPP
1304         if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL)
1305                 return NULL;
1306
1307         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1308                 char *sep;
1309                 const char *imsi;
1310                 int mnc_len;
1311
1312 #ifdef PCSC_FUNCS
1313                 if (cred->pcsc && wpa_s->conf->pcsc_reader && wpa_s->scard &&
1314                     wpa_s->imsi[0]) {
1315                         imsi = wpa_s->imsi;
1316                         mnc_len = wpa_s->mnc_len;
1317                         goto compare;
1318                 }
1319 #endif /* PCSC_FUNCS */
1320
1321                 if (cred->imsi == NULL || !cred->imsi[0] ||
1322                     cred->milenage == NULL || !cred->milenage[0])
1323                         continue;
1324
1325                 sep = os_strchr(cred->imsi, '-');
1326                 if (sep == NULL ||
1327                     (sep - cred->imsi != 5 && sep - cred->imsi != 6))
1328                         continue;
1329                 mnc_len = sep - cred->imsi - 3;
1330                 imsi = cred->imsi;
1331
1332 #ifdef PCSC_FUNCS
1333         compare:
1334 #endif /* PCSC_FUNCS */
1335                 wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from "
1336                            MACSTR, MAC2STR(bss->bssid));
1337                 ret = plmn_id_match(bss->anqp->anqp_3gpp, imsi, mnc_len);
1338                 wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
1339                 if (ret) {
1340                         if (selected == NULL ||
1341                             selected->priority < cred->priority)
1342                                 selected = cred;
1343                 }
1344         }
1345 #endif /* INTERWORKING_3GPP */
1346         return selected;
1347 }
1348
1349
1350 static struct wpa_cred * interworking_credentials_available_realm(
1351         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1352 {
1353         struct wpa_cred *cred, *selected = NULL;
1354         struct nai_realm *realm;
1355         u16 count, i;
1356
1357         if (bss->anqp == NULL || bss->anqp->nai_realm == NULL)
1358                 return NULL;
1359
1360         if (wpa_s->conf->cred == NULL)
1361                 return NULL;
1362
1363         wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
1364                    MACSTR, MAC2STR(bss->bssid));
1365         realm = nai_realm_parse(bss->anqp->nai_realm, &count);
1366         if (realm == NULL) {
1367                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
1368                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
1369                 return NULL;
1370         }
1371
1372         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1373                 if (cred->realm == NULL)
1374                         continue;
1375
1376                 for (i = 0; i < count; i++) {
1377                         if (!nai_realm_match(&realm[i], cred->realm))
1378                                 continue;
1379                         if (nai_realm_find_eap(cred, &realm[i])) {
1380                                 if (selected == NULL ||
1381                                     selected->priority < cred->priority)
1382                                         selected = cred;
1383                                 break;
1384                         }
1385                 }
1386         }
1387
1388         nai_realm_free(realm, count);
1389
1390         return selected;
1391 }
1392
1393
1394 static struct wpa_cred * interworking_credentials_available(
1395         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1396 {
1397         struct wpa_cred *cred, *cred2;
1398
1399         cred = interworking_credentials_available_realm(wpa_s, bss);
1400         cred2 = interworking_credentials_available_3gpp(wpa_s, bss);
1401         if (cred && cred2 && cred2->priority >= cred->priority)
1402                 cred = cred2;
1403         if (!cred)
1404                 cred = cred2;
1405
1406         cred2 = interworking_credentials_available_roaming_consortium(wpa_s,
1407                                                                       bss);
1408         if (cred && cred2 && cred2->priority >= cred->priority)
1409                 cred = cred2;
1410         if (!cred)
1411                 cred = cred2;
1412
1413         return cred;
1414 }
1415
1416
1417 static int domain_name_list_contains(struct wpabuf *domain_names,
1418                                      const char *domain)
1419 {
1420         const u8 *pos, *end;
1421         size_t len;
1422
1423         len = os_strlen(domain);
1424         pos = wpabuf_head(domain_names);
1425         end = pos + wpabuf_len(domain_names);
1426
1427         while (pos + 1 < end) {
1428                 if (pos + 1 + pos[0] > end)
1429                         break;
1430
1431                 wpa_hexdump_ascii(MSG_DEBUG, "Interworking: AP domain name",
1432                                   pos + 1, pos[0]);
1433                 if (pos[0] == len &&
1434                     os_strncasecmp(domain, (const char *) (pos + 1), len) == 0)
1435                         return 1;
1436
1437                 pos += 1 + pos[0];
1438         }
1439
1440         return 0;
1441 }
1442
1443
1444 int interworking_home_sp_cred(struct wpa_supplicant *wpa_s,
1445                               struct wpa_cred *cred,
1446                               struct wpabuf *domain_names)
1447 {
1448 #ifdef INTERWORKING_3GPP
1449         char nai[100], *realm;
1450
1451         char *imsi = NULL;
1452         int mnc_len = 0;
1453         if (cred->imsi)
1454                 imsi = cred->imsi;
1455 #ifdef CONFIG_PCSC
1456         else if (cred->pcsc && wpa_s->conf->pcsc_reader &&
1457                  wpa_s->scard && wpa_s->imsi[0]) {
1458                 imsi = wpa_s->imsi;
1459                 mnc_len = wpa_s->mnc_len;
1460         }
1461 #endif /* CONFIG_PCSC */
1462         if (imsi && build_root_nai(nai, sizeof(nai), imsi, mnc_len, 0) == 0) {
1463                 realm = os_strchr(nai, '@');
1464                 if (realm)
1465                         realm++;
1466                 wpa_printf(MSG_DEBUG, "Interworking: Search for match "
1467                            "with SIM/USIM domain %s", realm);
1468                 if (realm &&
1469                     domain_name_list_contains(domain_names, realm))
1470                         return 1;
1471         }
1472 #endif /* INTERWORKING_3GPP */
1473
1474         if (cred->domain == NULL)
1475                 return 0;
1476
1477         wpa_printf(MSG_DEBUG, "Interworking: Search for match with "
1478                    "home SP FQDN %s", cred->domain);
1479         if (domain_name_list_contains(domain_names, cred->domain))
1480                 return 1;
1481
1482         return 0;
1483 }
1484
1485
1486 static int interworking_home_sp(struct wpa_supplicant *wpa_s,
1487                                 struct wpabuf *domain_names)
1488 {
1489         struct wpa_cred *cred;
1490
1491         if (domain_names == NULL || wpa_s->conf->cred == NULL)
1492                 return -1;
1493
1494         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1495                 int res = interworking_home_sp_cred(wpa_s, cred, domain_names);
1496                 if (res)
1497                         return res;
1498         }
1499
1500         return 0;
1501 }
1502
1503
1504 static int interworking_find_network_match(struct wpa_supplicant *wpa_s)
1505 {
1506         struct wpa_bss *bss;
1507         struct wpa_ssid *ssid;
1508
1509         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1510                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1511                         if (wpas_network_disabled(wpa_s, ssid) ||
1512                             ssid->mode != WPAS_MODE_INFRA)
1513                                 continue;
1514                         if (ssid->ssid_len != bss->ssid_len ||
1515                             os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) !=
1516                             0)
1517                                 continue;
1518                         /*
1519                          * TODO: Consider more accurate matching of security
1520                          * configuration similarly to what is done in events.c
1521                          */
1522                         return 1;
1523                 }
1524         }
1525
1526         return 0;
1527 }
1528
1529
1530 static void interworking_select_network(struct wpa_supplicant *wpa_s)
1531 {
1532         struct wpa_bss *bss, *selected = NULL, *selected_home = NULL;
1533         int selected_prio = -999999, selected_home_prio = -999999;
1534         unsigned int count = 0;
1535         const char *type;
1536         int res;
1537         struct wpa_cred *cred;
1538
1539         wpa_s->network_select = 0;
1540
1541         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1542                 cred = interworking_credentials_available(wpa_s, bss);
1543                 if (!cred)
1544                         continue;
1545                 if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
1546                         /*
1547                          * We currently support only HS 2.0 networks and those
1548                          * are required to use WPA2-Enterprise.
1549                          */
1550                         wpa_printf(MSG_DEBUG, "Interworking: Credential match "
1551                                    "with " MACSTR " but network does not use "
1552                                    "RSN", MAC2STR(bss->bssid));
1553                         continue;
1554                 }
1555                 count++;
1556                 res = interworking_home_sp(wpa_s, bss->anqp ?
1557                                            bss->anqp->domain_name : NULL);
1558                 if (res > 0)
1559                         type = "home";
1560                 else if (res == 0)
1561                         type = "roaming";
1562                 else
1563                         type = "unknown";
1564                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR " type=%s",
1565                         MAC2STR(bss->bssid), type);
1566                 if (wpa_s->auto_select ||
1567                     (wpa_s->conf->auto_interworking &&
1568                      wpa_s->auto_network_select)) {
1569                         if (selected == NULL ||
1570                             cred->priority > selected_prio) {
1571                                 selected = bss;
1572                                 selected_prio = cred->priority;
1573                         }
1574                         if (res > 0 &&
1575                             (selected_home == NULL ||
1576                              cred->priority > selected_home_prio)) {
1577                                 selected_home = bss;
1578                                 selected_home_prio = cred->priority;
1579                         }
1580                 }
1581         }
1582
1583         if (selected_home && selected_home != selected &&
1584             selected_home_prio >= selected_prio) {
1585                 /* Prefer network operated by the Home SP */
1586                 selected = selected_home;
1587         }
1588
1589         if (count == 0) {
1590                 /*
1591                  * No matching network was found based on configured
1592                  * credentials. Check whether any of the enabled network blocks
1593                  * have matching APs.
1594                  */
1595                 if (interworking_find_network_match(wpa_s)) {
1596                         wpa_printf(MSG_DEBUG, "Interworking: Possible BSS "
1597                                    "match for enabled network configurations");
1598                         if (wpa_s->auto_select)
1599                                 interworking_reconnect(wpa_s);
1600                         return;
1601                 }
1602
1603                 if (wpa_s->auto_network_select) {
1604                         wpa_printf(MSG_DEBUG, "Interworking: Continue "
1605                                    "scanning after ANQP fetch");
1606                         wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval,
1607                                                 0);
1608                         return;
1609                 }
1610
1611                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
1612                         "with matching credentials found");
1613         }
1614
1615         if (selected)
1616                 interworking_connect(wpa_s, selected);
1617 }
1618
1619
1620 static struct wpa_bss_anqp *
1621 interworking_match_anqp_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1622 {
1623         struct wpa_bss *other;
1624
1625         if (is_zero_ether_addr(bss->hessid))
1626                 return NULL; /* Cannot be in the same homegenous ESS */
1627
1628         dl_list_for_each(other, &wpa_s->bss, struct wpa_bss, list) {
1629                 if (other == bss)
1630                         continue;
1631                 if (other->anqp == NULL)
1632                         continue;
1633                 if (!(other->flags & WPA_BSS_ANQP_FETCH_TRIED))
1634                         continue;
1635                 if (os_memcmp(bss->hessid, other->hessid, ETH_ALEN) != 0)
1636                         continue;
1637                 if (bss->ssid_len != other->ssid_len ||
1638                     os_memcmp(bss->ssid, other->ssid, bss->ssid_len) != 0)
1639                         continue;
1640
1641                 wpa_printf(MSG_DEBUG, "Interworking: Share ANQP data with "
1642                            "already fetched BSSID " MACSTR " and " MACSTR,
1643                            MAC2STR(other->bssid), MAC2STR(bss->bssid));
1644                 other->anqp->users++;
1645                 return other->anqp;
1646         }
1647
1648         return NULL;
1649 }
1650
1651
1652 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
1653 {
1654         struct wpa_bss *bss;
1655         int found = 0;
1656         const u8 *ie;
1657
1658         if (!wpa_s->fetch_anqp_in_progress)
1659                 return;
1660
1661         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1662                 if (!(bss->caps & IEEE80211_CAP_ESS))
1663                         continue;
1664                 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
1665                 if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
1666                         continue; /* AP does not support Interworking */
1667
1668                 if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
1669                         if (bss->anqp == NULL) {
1670                                 bss->anqp = interworking_match_anqp_info(wpa_s,
1671                                                                          bss);
1672                                 if (bss->anqp) {
1673                                         /* Shared data already fetched */
1674                                         continue;
1675                                 }
1676                                 bss->anqp = wpa_bss_anqp_alloc();
1677                                 if (bss->anqp == NULL)
1678                                         break;
1679                         }
1680                         found++;
1681                         bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
1682                         wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
1683                                 MACSTR, MAC2STR(bss->bssid));
1684                         interworking_anqp_send_req(wpa_s, bss);
1685                         break;
1686                 }
1687         }
1688
1689         if (found == 0) {
1690                 wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
1691                 wpa_s->fetch_anqp_in_progress = 0;
1692                 if (wpa_s->network_select)
1693                         interworking_select_network(wpa_s);
1694         }
1695 }
1696
1697
1698 void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
1699 {
1700         struct wpa_bss *bss;
1701
1702         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
1703                 bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
1704
1705         wpa_s->fetch_anqp_in_progress = 1;
1706         interworking_next_anqp_fetch(wpa_s);
1707 }
1708
1709
1710 int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
1711 {
1712         if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
1713                 return 0;
1714
1715         wpa_s->network_select = 0;
1716         wpa_s->fetch_all_anqp = 1;
1717
1718         interworking_start_fetch_anqp(wpa_s);
1719
1720         return 0;
1721 }
1722
1723
1724 void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
1725 {
1726         if (!wpa_s->fetch_anqp_in_progress)
1727                 return;
1728
1729         wpa_s->fetch_anqp_in_progress = 0;
1730 }
1731
1732
1733 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
1734                   u16 info_ids[], size_t num_ids)
1735 {
1736         struct wpabuf *buf;
1737         int ret = 0;
1738         int freq;
1739         struct wpa_bss *bss;
1740         int res;
1741
1742         freq = wpa_s->assoc_freq;
1743         bss = wpa_bss_get_bssid(wpa_s, dst);
1744         if (bss) {
1745                 wpa_bss_anqp_unshare_alloc(bss);
1746                 freq = bss->freq;
1747         }
1748         if (freq <= 0)
1749                 return -1;
1750
1751         wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
1752                    MAC2STR(dst), (unsigned int) num_ids);
1753
1754         buf = anqp_build_req(info_ids, num_ids, NULL);
1755         if (buf == NULL)
1756                 return -1;
1757
1758         res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
1759         if (res < 0) {
1760                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
1761                 ret = -1;
1762         } else
1763                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
1764                            "%u", res);
1765
1766         wpabuf_free(buf);
1767         return ret;
1768 }
1769
1770
1771 static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
1772                                             const u8 *sa, u16 info_id,
1773                                             const u8 *data, size_t slen)
1774 {
1775         const u8 *pos = data;
1776         struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);
1777         struct wpa_bss_anqp *anqp = NULL;
1778 #ifdef CONFIG_HS20
1779         u8 type;
1780 #endif /* CONFIG_HS20 */
1781
1782         if (bss)
1783                 anqp = bss->anqp;
1784
1785         switch (info_id) {
1786         case ANQP_CAPABILITY_LIST:
1787                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1788                         " ANQP Capability list", MAC2STR(sa));
1789                 break;
1790         case ANQP_VENUE_NAME:
1791                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1792                         " Venue Name", MAC2STR(sa));
1793                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
1794                 if (anqp) {
1795                         wpabuf_free(anqp->venue_name);
1796                         anqp->venue_name = wpabuf_alloc_copy(pos, slen);
1797                 }
1798                 break;
1799         case ANQP_NETWORK_AUTH_TYPE:
1800                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1801                         " Network Authentication Type information",
1802                         MAC2STR(sa));
1803                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
1804                                   "Type", pos, slen);
1805                 if (anqp) {
1806                         wpabuf_free(anqp->network_auth_type);
1807                         anqp->network_auth_type = wpabuf_alloc_copy(pos, slen);
1808                 }
1809                 break;
1810         case ANQP_ROAMING_CONSORTIUM:
1811                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1812                         " Roaming Consortium list", MAC2STR(sa));
1813                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
1814                                   pos, slen);
1815                 if (anqp) {
1816                         wpabuf_free(anqp->roaming_consortium);
1817                         anqp->roaming_consortium = wpabuf_alloc_copy(pos, slen);
1818                 }
1819                 break;
1820         case ANQP_IP_ADDR_TYPE_AVAILABILITY:
1821                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1822                         " IP Address Type Availability information",
1823                         MAC2STR(sa));
1824                 wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
1825                             pos, slen);
1826                 if (anqp) {
1827                         wpabuf_free(anqp->ip_addr_type_availability);
1828                         anqp->ip_addr_type_availability =
1829                                 wpabuf_alloc_copy(pos, slen);
1830                 }
1831                 break;
1832         case ANQP_NAI_REALM:
1833                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1834                         " NAI Realm list", MAC2STR(sa));
1835                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
1836                 if (anqp) {
1837                         wpabuf_free(anqp->nai_realm);
1838                         anqp->nai_realm = wpabuf_alloc_copy(pos, slen);
1839                 }
1840                 break;
1841         case ANQP_3GPP_CELLULAR_NETWORK:
1842                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1843                         " 3GPP Cellular Network information", MAC2STR(sa));
1844                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
1845                                   pos, slen);
1846                 if (anqp) {
1847                         wpabuf_free(anqp->anqp_3gpp);
1848                         anqp->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
1849                 }
1850                 break;
1851         case ANQP_DOMAIN_NAME:
1852                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1853                         " Domain Name list", MAC2STR(sa));
1854                 wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
1855                 if (anqp) {
1856                         wpabuf_free(anqp->domain_name);
1857                         anqp->domain_name = wpabuf_alloc_copy(pos, slen);
1858                 }
1859                 break;
1860         case ANQP_VENDOR_SPECIFIC:
1861                 if (slen < 3)
1862                         return;
1863
1864                 switch (WPA_GET_BE24(pos)) {
1865 #ifdef CONFIG_HS20
1866                 case OUI_WFA:
1867                         pos += 3;
1868                         slen -= 3;
1869
1870                         if (slen < 1)
1871                                 return;
1872                         type = *pos++;
1873                         slen--;
1874
1875                         switch (type) {
1876                         case HS20_ANQP_OUI_TYPE:
1877                                 hs20_parse_rx_hs20_anqp_resp(wpa_s, sa, pos,
1878                                                              slen);
1879                                 break;
1880                         default:
1881                                 wpa_printf(MSG_DEBUG, "HS20: Unsupported ANQP "
1882                                            "vendor type %u", type);
1883                                 break;
1884                         }
1885                         break;
1886 #endif /* CONFIG_HS20 */
1887                 default:
1888                         wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
1889                                    "vendor-specific ANQP OUI %06x",
1890                                    WPA_GET_BE24(pos));
1891                         return;
1892                 }
1893                 break;
1894         default:
1895                 wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
1896                            "%u", info_id);
1897                 break;
1898         }
1899 }
1900
1901
1902 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
1903                   enum gas_query_result result,
1904                   const struct wpabuf *adv_proto,
1905                   const struct wpabuf *resp, u16 status_code)
1906 {
1907         struct wpa_supplicant *wpa_s = ctx;
1908         const u8 *pos;
1909         const u8 *end;
1910         u16 info_id;
1911         u16 slen;
1912
1913         if (result != GAS_QUERY_SUCCESS)
1914                 return;
1915
1916         pos = wpabuf_head(adv_proto);
1917         if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
1918             pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
1919                 wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
1920                            "Protocol in response");
1921                 return;
1922         }
1923
1924         pos = wpabuf_head(resp);
1925         end = pos + wpabuf_len(resp);
1926
1927         while (pos < end) {
1928                 if (pos + 4 > end) {
1929                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
1930                         break;
1931                 }
1932                 info_id = WPA_GET_LE16(pos);
1933                 pos += 2;
1934                 slen = WPA_GET_LE16(pos);
1935                 pos += 2;
1936                 if (pos + slen > end) {
1937                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
1938                                    "for Info ID %u", info_id);
1939                         break;
1940                 }
1941                 interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
1942                                                 slen);
1943                 pos += slen;
1944         }
1945 }
1946
1947
1948 static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
1949                                           struct wpa_scan_results *scan_res)
1950 {
1951         wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
1952                    "ANQP fetch");
1953         interworking_start_fetch_anqp(wpa_s);
1954 }
1955
1956
1957 int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
1958 {
1959         interworking_stop_fetch_anqp(wpa_s);
1960         wpa_s->network_select = 1;
1961         wpa_s->auto_network_select = 0;
1962         wpa_s->auto_select = !!auto_select;
1963         wpa_s->fetch_all_anqp = 0;
1964         wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
1965                    "selection");
1966         wpa_s->scan_res_handler = interworking_scan_res_handler;
1967         wpa_s->scan_req = MANUAL_SCAN_REQ;
1968         wpa_supplicant_req_scan(wpa_s, 0, 0);
1969
1970         return 0;
1971 }
1972
1973
1974 static void gas_resp_cb(void *ctx, const u8 *addr, u8 dialog_token,
1975                         enum gas_query_result result,
1976                         const struct wpabuf *adv_proto,
1977                         const struct wpabuf *resp, u16 status_code)
1978 {
1979         struct wpa_supplicant *wpa_s = ctx;
1980
1981         wpa_msg(wpa_s, MSG_INFO, GAS_RESPONSE_INFO "addr=" MACSTR
1982                 " dialog_token=%d status_code=%d resp_len=%d",
1983                 MAC2STR(addr), dialog_token, status_code,
1984                 resp ? (int) wpabuf_len(resp) : -1);
1985         if (!resp)
1986                 return;
1987
1988         wpabuf_free(wpa_s->last_gas_resp);
1989         wpa_s->last_gas_resp = wpabuf_dup(resp);
1990         if (wpa_s->last_gas_resp == NULL)
1991                 return;
1992         os_memcpy(wpa_s->last_gas_addr, addr, ETH_ALEN);
1993         wpa_s->last_gas_dialog_token = dialog_token;
1994 }
1995
1996
1997 int gas_send_request(struct wpa_supplicant *wpa_s, const u8 *dst,
1998                      const struct wpabuf *adv_proto,
1999                      const struct wpabuf *query)
2000 {
2001         struct wpabuf *buf;
2002         int ret = 0;
2003         int freq;
2004         struct wpa_bss *bss;
2005         int res;
2006         size_t len;
2007         u8 query_resp_len_limit = 0, pame_bi = 0;
2008
2009         freq = wpa_s->assoc_freq;
2010         bss = wpa_bss_get_bssid(wpa_s, dst);
2011         if (bss)
2012                 freq = bss->freq;
2013         if (freq <= 0)
2014                 return -1;
2015
2016         wpa_printf(MSG_DEBUG, "GAS request to " MACSTR " (freq %d MHz)",
2017                    MAC2STR(dst), freq);
2018         wpa_hexdump_buf(MSG_DEBUG, "Advertisement Protocol ID", adv_proto);
2019         wpa_hexdump_buf(MSG_DEBUG, "GAS Query", query);
2020
2021         len = 3 + wpabuf_len(adv_proto) + 2;
2022         if (query)
2023                 len += wpabuf_len(query);
2024         buf = gas_build_initial_req(0, len);
2025         if (buf == NULL)
2026                 return -1;
2027
2028         /* Advertisement Protocol IE */
2029         wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
2030         wpabuf_put_u8(buf, 1 + wpabuf_len(adv_proto)); /* Length */
2031         wpabuf_put_u8(buf, (query_resp_len_limit & 0x7f) |
2032                       (pame_bi ? 0x80 : 0));
2033         wpabuf_put_buf(buf, adv_proto);
2034
2035         /* GAS Query */
2036         if (query) {
2037                 wpabuf_put_le16(buf, wpabuf_len(query));
2038                 wpabuf_put_buf(buf, query);
2039         } else
2040                 wpabuf_put_le16(buf, 0);
2041
2042         res = gas_query_req(wpa_s->gas, dst, freq, buf, gas_resp_cb, wpa_s);
2043         if (res < 0) {
2044                 wpa_printf(MSG_DEBUG, "GAS: Failed to send Query Request");
2045                 ret = -1;
2046         } else
2047                 wpa_printf(MSG_DEBUG, "GAS: Query started with dialog token "
2048                            "%u", res);
2049
2050         wpabuf_free(buf);
2051         return ret;
2052 }