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 1; /* Assume TTLS/MSCHAPv2 is used */
 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                 default:
1267                         /* EAP params were not set - assume TTLS/MSCHAPv2 */
1268                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
1269                                            0) < 0)
1270                                 goto fail;
1271                         break;
1272                 }
1273                 break;
1274         case EAP_TYPE_PEAP:
1275                 os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
1276                             eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
1277                 if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
1278                         goto fail;
1279                 break;
1280         case EAP_TYPE_TLS:
1281                 break;
1282         }
1283
1284         if (interworking_set_eap_params(ssid, cred,
1285                                         eap->method == EAP_TYPE_TTLS) < 0)
1286                 goto fail;
1287
1288         nai_realm_free(realm, count);
1289
1290         wpa_config_update_prio_list(wpa_s->conf);
1291         interworking_reconnect(wpa_s);
1292
1293         return 0;
1294
1295 fail:
1296         wpas_notify_network_removed(wpa_s, ssid);
1297         wpa_config_remove_network(wpa_s->conf, ssid->id);
1298         nai_realm_free(realm, count);
1299         return -1;
1300 }
1301
1302
1303 static struct wpa_cred * interworking_credentials_available_3gpp(
1304         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1305 {
1306         struct wpa_cred *cred, *selected = NULL;
1307         int ret;
1308
1309 #ifdef INTERWORKING_3GPP
1310         if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL)
1311                 return NULL;
1312
1313         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1314                 char *sep;
1315                 const char *imsi;
1316                 int mnc_len;
1317
1318 #ifdef PCSC_FUNCS
1319                 if (cred->pcsc && wpa_s->conf->pcsc_reader && wpa_s->scard &&
1320                     wpa_s->imsi[0]) {
1321                         imsi = wpa_s->imsi;
1322                         mnc_len = wpa_s->mnc_len;
1323                         goto compare;
1324                 }
1325 #endif /* PCSC_FUNCS */
1326
1327                 if (cred->imsi == NULL || !cred->imsi[0] ||
1328                     cred->milenage == NULL || !cred->milenage[0])
1329                         continue;
1330
1331                 sep = os_strchr(cred->imsi, '-');
1332                 if (sep == NULL ||
1333                     (sep - cred->imsi != 5 && sep - cred->imsi != 6))
1334                         continue;
1335                 mnc_len = sep - cred->imsi - 3;
1336                 imsi = cred->imsi;
1337
1338 #ifdef PCSC_FUNCS
1339         compare:
1340 #endif /* PCSC_FUNCS */
1341                 wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from "
1342                            MACSTR, MAC2STR(bss->bssid));
1343                 ret = plmn_id_match(bss->anqp->anqp_3gpp, imsi, mnc_len);
1344                 wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
1345                 if (ret) {
1346                         if (selected == NULL ||
1347                             selected->priority < cred->priority)
1348                                 selected = cred;
1349                 }
1350         }
1351 #endif /* INTERWORKING_3GPP */
1352         return selected;
1353 }
1354
1355
1356 static struct wpa_cred * interworking_credentials_available_realm(
1357         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1358 {
1359         struct wpa_cred *cred, *selected = NULL;
1360         struct nai_realm *realm;
1361         u16 count, i;
1362
1363         if (bss->anqp == NULL || bss->anqp->nai_realm == NULL)
1364                 return NULL;
1365
1366         if (wpa_s->conf->cred == NULL)
1367                 return NULL;
1368
1369         wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
1370                    MACSTR, MAC2STR(bss->bssid));
1371         realm = nai_realm_parse(bss->anqp->nai_realm, &count);
1372         if (realm == NULL) {
1373                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
1374                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
1375                 return NULL;
1376         }
1377
1378         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1379                 if (cred->realm == NULL)
1380                         continue;
1381
1382                 for (i = 0; i < count; i++) {
1383                         if (!nai_realm_match(&realm[i], cred->realm))
1384                                 continue;
1385                         if (nai_realm_find_eap(cred, &realm[i])) {
1386                                 if (selected == NULL ||
1387                                     selected->priority < cred->priority)
1388                                         selected = cred;
1389                                 break;
1390                         }
1391                 }
1392         }
1393
1394         nai_realm_free(realm, count);
1395
1396         return selected;
1397 }
1398
1399
1400 static struct wpa_cred * interworking_credentials_available(
1401         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1402 {
1403         struct wpa_cred *cred, *cred2;
1404
1405         cred = interworking_credentials_available_realm(wpa_s, bss);
1406         cred2 = interworking_credentials_available_3gpp(wpa_s, bss);
1407         if (cred && cred2 && cred2->priority >= cred->priority)
1408                 cred = cred2;
1409         if (!cred)
1410                 cred = cred2;
1411
1412         cred2 = interworking_credentials_available_roaming_consortium(wpa_s,
1413                                                                       bss);
1414         if (cred && cred2 && cred2->priority >= cred->priority)
1415                 cred = cred2;
1416         if (!cred)
1417                 cred = cred2;
1418
1419         return cred;
1420 }
1421
1422
1423 static int domain_name_list_contains(struct wpabuf *domain_names,
1424                                      const char *domain)
1425 {
1426         const u8 *pos, *end;
1427         size_t len;
1428
1429         len = os_strlen(domain);
1430         pos = wpabuf_head(domain_names);
1431         end = pos + wpabuf_len(domain_names);
1432
1433         while (pos + 1 < end) {
1434                 if (pos + 1 + pos[0] > end)
1435                         break;
1436
1437                 wpa_hexdump_ascii(MSG_DEBUG, "Interworking: AP domain name",
1438                                   pos + 1, pos[0]);
1439                 if (pos[0] == len &&
1440                     os_strncasecmp(domain, (const char *) (pos + 1), len) == 0)
1441                         return 1;
1442
1443                 pos += 1 + pos[0];
1444         }
1445
1446         return 0;
1447 }
1448
1449
1450 int interworking_home_sp_cred(struct wpa_supplicant *wpa_s,
1451                               struct wpa_cred *cred,
1452                               struct wpabuf *domain_names)
1453 {
1454 #ifdef INTERWORKING_3GPP
1455         char nai[100], *realm;
1456
1457         char *imsi = NULL;
1458         int mnc_len = 0;
1459         if (cred->imsi)
1460                 imsi = cred->imsi;
1461 #ifdef CONFIG_PCSC
1462         else if (cred->pcsc && wpa_s->conf->pcsc_reader &&
1463                  wpa_s->scard && wpa_s->imsi[0]) {
1464                 imsi = wpa_s->imsi;
1465                 mnc_len = wpa_s->mnc_len;
1466         }
1467 #endif /* CONFIG_PCSC */
1468         if (imsi && build_root_nai(nai, sizeof(nai), imsi, mnc_len, 0) == 0) {
1469                 realm = os_strchr(nai, '@');
1470                 if (realm)
1471                         realm++;
1472                 wpa_printf(MSG_DEBUG, "Interworking: Search for match "
1473                            "with SIM/USIM domain %s", realm);
1474                 if (realm &&
1475                     domain_name_list_contains(domain_names, realm))
1476                         return 1;
1477         }
1478 #endif /* INTERWORKING_3GPP */
1479
1480         if (cred->domain == NULL)
1481                 return 0;
1482
1483         wpa_printf(MSG_DEBUG, "Interworking: Search for match with "
1484                    "home SP FQDN %s", cred->domain);
1485         if (domain_name_list_contains(domain_names, cred->domain))
1486                 return 1;
1487
1488         return 0;
1489 }
1490
1491
1492 static int interworking_home_sp(struct wpa_supplicant *wpa_s,
1493                                 struct wpabuf *domain_names)
1494 {
1495         struct wpa_cred *cred;
1496
1497         if (domain_names == NULL || wpa_s->conf->cred == NULL)
1498                 return -1;
1499
1500         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
1501                 int res = interworking_home_sp_cred(wpa_s, cred, domain_names);
1502                 if (res)
1503                         return res;
1504         }
1505
1506         return 0;
1507 }
1508
1509
1510 static int interworking_find_network_match(struct wpa_supplicant *wpa_s)
1511 {
1512         struct wpa_bss *bss;
1513         struct wpa_ssid *ssid;
1514
1515         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1516                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1517                         if (wpas_network_disabled(wpa_s, ssid) ||
1518                             ssid->mode != WPAS_MODE_INFRA)
1519                                 continue;
1520                         if (ssid->ssid_len != bss->ssid_len ||
1521                             os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) !=
1522                             0)
1523                                 continue;
1524                         /*
1525                          * TODO: Consider more accurate matching of security
1526                          * configuration similarly to what is done in events.c
1527                          */
1528                         return 1;
1529                 }
1530         }
1531
1532         return 0;
1533 }
1534
1535
1536 static void interworking_select_network(struct wpa_supplicant *wpa_s)
1537 {
1538         struct wpa_bss *bss, *selected = NULL, *selected_home = NULL;
1539         int selected_prio = -999999, selected_home_prio = -999999;
1540         unsigned int count = 0;
1541         const char *type;
1542         int res;
1543         struct wpa_cred *cred;
1544
1545         wpa_s->network_select = 0;
1546
1547         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1548                 cred = interworking_credentials_available(wpa_s, bss);
1549                 if (!cred)
1550                         continue;
1551                 if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
1552                         /*
1553                          * We currently support only HS 2.0 networks and those
1554                          * are required to use WPA2-Enterprise.
1555                          */
1556                         wpa_printf(MSG_DEBUG, "Interworking: Credential match "
1557                                    "with " MACSTR " but network does not use "
1558                                    "RSN", MAC2STR(bss->bssid));
1559                         continue;
1560                 }
1561                 count++;
1562                 res = interworking_home_sp(wpa_s, bss->anqp ?
1563                                            bss->anqp->domain_name : NULL);
1564                 if (res > 0)
1565                         type = "home";
1566                 else if (res == 0)
1567                         type = "roaming";
1568                 else
1569                         type = "unknown";
1570                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR " type=%s",
1571                         MAC2STR(bss->bssid), type);
1572                 if (wpa_s->auto_select ||
1573                     (wpa_s->conf->auto_interworking &&
1574                      wpa_s->auto_network_select)) {
1575                         if (selected == NULL ||
1576                             cred->priority > selected_prio) {
1577                                 selected = bss;
1578                                 selected_prio = cred->priority;
1579                         }
1580                         if (res > 0 &&
1581                             (selected_home == NULL ||
1582                              cred->priority > selected_home_prio)) {
1583                                 selected_home = bss;
1584                                 selected_home_prio = cred->priority;
1585                         }
1586                 }
1587         }
1588
1589         if (selected_home && selected_home != selected &&
1590             selected_home_prio >= selected_prio) {
1591                 /* Prefer network operated by the Home SP */
1592                 selected = selected_home;
1593         }
1594
1595         if (count == 0) {
1596                 /*
1597                  * No matching network was found based on configured
1598                  * credentials. Check whether any of the enabled network blocks
1599                  * have matching APs.
1600                  */
1601                 if (interworking_find_network_match(wpa_s)) {
1602                         wpa_printf(MSG_DEBUG, "Interworking: Possible BSS "
1603                                    "match for enabled network configurations");
1604                         if (wpa_s->auto_select)
1605                                 interworking_reconnect(wpa_s);
1606                         return;
1607                 }
1608
1609                 if (wpa_s->auto_network_select) {
1610                         wpa_printf(MSG_DEBUG, "Interworking: Continue "
1611                                    "scanning after ANQP fetch");
1612                         wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval,
1613                                                 0);
1614                         return;
1615                 }
1616
1617                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
1618                         "with matching credentials found");
1619         }
1620
1621         if (selected)
1622                 interworking_connect(wpa_s, selected);
1623 }
1624
1625
1626 static struct wpa_bss_anqp *
1627 interworking_match_anqp_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
1628 {
1629         struct wpa_bss *other;
1630
1631         if (is_zero_ether_addr(bss->hessid))
1632                 return NULL; /* Cannot be in the same homegenous ESS */
1633
1634         dl_list_for_each(other, &wpa_s->bss, struct wpa_bss, list) {
1635                 if (other == bss)
1636                         continue;
1637                 if (other->anqp == NULL)
1638                         continue;
1639                 if (!(other->flags & WPA_BSS_ANQP_FETCH_TRIED))
1640                         continue;
1641                 if (os_memcmp(bss->hessid, other->hessid, ETH_ALEN) != 0)
1642                         continue;
1643                 if (bss->ssid_len != other->ssid_len ||
1644                     os_memcmp(bss->ssid, other->ssid, bss->ssid_len) != 0)
1645                         continue;
1646
1647                 wpa_printf(MSG_DEBUG, "Interworking: Share ANQP data with "
1648                            "already fetched BSSID " MACSTR " and " MACSTR,
1649                            MAC2STR(other->bssid), MAC2STR(bss->bssid));
1650                 other->anqp->users++;
1651                 return other->anqp;
1652         }
1653
1654         return NULL;
1655 }
1656
1657
1658 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
1659 {
1660         struct wpa_bss *bss;
1661         int found = 0;
1662         const u8 *ie;
1663
1664         if (!wpa_s->fetch_anqp_in_progress)
1665                 return;
1666
1667         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1668                 if (!(bss->caps & IEEE80211_CAP_ESS))
1669                         continue;
1670                 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
1671                 if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
1672                         continue; /* AP does not support Interworking */
1673
1674                 if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
1675                         if (bss->anqp == NULL) {
1676                                 bss->anqp = interworking_match_anqp_info(wpa_s,
1677                                                                          bss);
1678                                 if (bss->anqp) {
1679                                         /* Shared data already fetched */
1680                                         continue;
1681                                 }
1682                                 bss->anqp = wpa_bss_anqp_alloc();
1683                                 if (bss->anqp == NULL)
1684                                         break;
1685                         }
1686                         found++;
1687                         bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
1688                         wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
1689                                 MACSTR, MAC2STR(bss->bssid));
1690                         interworking_anqp_send_req(wpa_s, bss);
1691                         break;
1692                 }
1693         }
1694
1695         if (found == 0) {
1696                 wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
1697                 wpa_s->fetch_anqp_in_progress = 0;
1698                 if (wpa_s->network_select)
1699                         interworking_select_network(wpa_s);
1700         }
1701 }
1702
1703
1704 void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
1705 {
1706         struct wpa_bss *bss;
1707
1708         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
1709                 bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
1710
1711         wpa_s->fetch_anqp_in_progress = 1;
1712         interworking_next_anqp_fetch(wpa_s);
1713 }
1714
1715
1716 int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
1717 {
1718         if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
1719                 return 0;
1720
1721         wpa_s->network_select = 0;
1722         wpa_s->fetch_all_anqp = 1;
1723
1724         interworking_start_fetch_anqp(wpa_s);
1725
1726         return 0;
1727 }
1728
1729
1730 void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
1731 {
1732         if (!wpa_s->fetch_anqp_in_progress)
1733                 return;
1734
1735         wpa_s->fetch_anqp_in_progress = 0;
1736 }
1737
1738
1739 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
1740                   u16 info_ids[], size_t num_ids)
1741 {
1742         struct wpabuf *buf;
1743         int ret = 0;
1744         int freq;
1745         struct wpa_bss *bss;
1746         int res;
1747
1748         freq = wpa_s->assoc_freq;
1749         bss = wpa_bss_get_bssid(wpa_s, dst);
1750         if (bss) {
1751                 wpa_bss_anqp_unshare_alloc(bss);
1752                 freq = bss->freq;
1753         }
1754         if (freq <= 0)
1755                 return -1;
1756
1757         wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
1758                    MAC2STR(dst), (unsigned int) num_ids);
1759
1760         buf = anqp_build_req(info_ids, num_ids, NULL);
1761         if (buf == NULL)
1762                 return -1;
1763
1764         res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
1765         if (res < 0) {
1766                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
1767                 ret = -1;
1768         } else
1769                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
1770                            "%u", res);
1771
1772         wpabuf_free(buf);
1773         return ret;
1774 }
1775
1776
1777 static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
1778                                             const u8 *sa, u16 info_id,
1779                                             const u8 *data, size_t slen)
1780 {
1781         const u8 *pos = data;
1782         struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);
1783         struct wpa_bss_anqp *anqp = NULL;
1784 #ifdef CONFIG_HS20
1785         u8 type;
1786 #endif /* CONFIG_HS20 */
1787
1788         if (bss)
1789                 anqp = bss->anqp;
1790
1791         switch (info_id) {
1792         case ANQP_CAPABILITY_LIST:
1793                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1794                         " ANQP Capability list", MAC2STR(sa));
1795                 break;
1796         case ANQP_VENUE_NAME:
1797                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1798                         " Venue Name", MAC2STR(sa));
1799                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
1800                 if (anqp) {
1801                         wpabuf_free(anqp->venue_name);
1802                         anqp->venue_name = wpabuf_alloc_copy(pos, slen);
1803                 }
1804                 break;
1805         case ANQP_NETWORK_AUTH_TYPE:
1806                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1807                         " Network Authentication Type information",
1808                         MAC2STR(sa));
1809                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
1810                                   "Type", pos, slen);
1811                 if (anqp) {
1812                         wpabuf_free(anqp->network_auth_type);
1813                         anqp->network_auth_type = wpabuf_alloc_copy(pos, slen);
1814                 }
1815                 break;
1816         case ANQP_ROAMING_CONSORTIUM:
1817                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1818                         " Roaming Consortium list", MAC2STR(sa));
1819                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
1820                                   pos, slen);
1821                 if (anqp) {
1822                         wpabuf_free(anqp->roaming_consortium);
1823                         anqp->roaming_consortium = wpabuf_alloc_copy(pos, slen);
1824                 }
1825                 break;
1826         case ANQP_IP_ADDR_TYPE_AVAILABILITY:
1827                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1828                         " IP Address Type Availability information",
1829                         MAC2STR(sa));
1830                 wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
1831                             pos, slen);
1832                 if (anqp) {
1833                         wpabuf_free(anqp->ip_addr_type_availability);
1834                         anqp->ip_addr_type_availability =
1835                                 wpabuf_alloc_copy(pos, slen);
1836                 }
1837                 break;
1838         case ANQP_NAI_REALM:
1839                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1840                         " NAI Realm list", MAC2STR(sa));
1841                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
1842                 if (anqp) {
1843                         wpabuf_free(anqp->nai_realm);
1844                         anqp->nai_realm = wpabuf_alloc_copy(pos, slen);
1845                 }
1846                 break;
1847         case ANQP_3GPP_CELLULAR_NETWORK:
1848                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1849                         " 3GPP Cellular Network information", MAC2STR(sa));
1850                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
1851                                   pos, slen);
1852                 if (anqp) {
1853                         wpabuf_free(anqp->anqp_3gpp);
1854                         anqp->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
1855                 }
1856                 break;
1857         case ANQP_DOMAIN_NAME:
1858                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1859                         " Domain Name list", MAC2STR(sa));
1860                 wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
1861                 if (anqp) {
1862                         wpabuf_free(anqp->domain_name);
1863                         anqp->domain_name = wpabuf_alloc_copy(pos, slen);
1864                 }
1865                 break;
1866         case ANQP_VENDOR_SPECIFIC:
1867                 if (slen < 3)
1868                         return;
1869
1870                 switch (WPA_GET_BE24(pos)) {
1871 #ifdef CONFIG_HS20
1872                 case OUI_WFA:
1873                         pos += 3;
1874                         slen -= 3;
1875
1876                         if (slen < 1)
1877                                 return;
1878                         type = *pos++;
1879                         slen--;
1880
1881                         switch (type) {
1882                         case HS20_ANQP_OUI_TYPE:
1883                                 hs20_parse_rx_hs20_anqp_resp(wpa_s, sa, pos,
1884                                                              slen);
1885                                 break;
1886                         default:
1887                                 wpa_printf(MSG_DEBUG, "HS20: Unsupported ANQP "
1888                                            "vendor type %u", type);
1889                                 break;
1890                         }
1891                         break;
1892 #endif /* CONFIG_HS20 */
1893                 default:
1894                         wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
1895                                    "vendor-specific ANQP OUI %06x",
1896                                    WPA_GET_BE24(pos));
1897                         return;
1898                 }
1899                 break;
1900         default:
1901                 wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
1902                            "%u", info_id);
1903                 break;
1904         }
1905 }
1906
1907
1908 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
1909                   enum gas_query_result result,
1910                   const struct wpabuf *adv_proto,
1911                   const struct wpabuf *resp, u16 status_code)
1912 {
1913         struct wpa_supplicant *wpa_s = ctx;
1914         const u8 *pos;
1915         const u8 *end;
1916         u16 info_id;
1917         u16 slen;
1918
1919         if (result != GAS_QUERY_SUCCESS)
1920                 return;
1921
1922         pos = wpabuf_head(adv_proto);
1923         if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
1924             pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
1925                 wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
1926                            "Protocol in response");
1927                 return;
1928         }
1929
1930         pos = wpabuf_head(resp);
1931         end = pos + wpabuf_len(resp);
1932
1933         while (pos < end) {
1934                 if (pos + 4 > end) {
1935                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
1936                         break;
1937                 }
1938                 info_id = WPA_GET_LE16(pos);
1939                 pos += 2;
1940                 slen = WPA_GET_LE16(pos);
1941                 pos += 2;
1942                 if (pos + slen > end) {
1943                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
1944                                    "for Info ID %u", info_id);
1945                         break;
1946                 }
1947                 interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
1948                                                 slen);
1949                 pos += slen;
1950         }
1951 }
1952
1953
1954 static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
1955                                           struct wpa_scan_results *scan_res)
1956 {
1957         wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
1958                    "ANQP fetch");
1959         interworking_start_fetch_anqp(wpa_s);
1960 }
1961
1962
1963 int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
1964 {
1965         interworking_stop_fetch_anqp(wpa_s);
1966         wpa_s->network_select = 1;
1967         wpa_s->auto_network_select = 0;
1968         wpa_s->auto_select = !!auto_select;
1969         wpa_s->fetch_all_anqp = 0;
1970         wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
1971                    "selection");
1972         wpa_s->scan_res_handler = interworking_scan_res_handler;
1973         wpa_s->scan_req = MANUAL_SCAN_REQ;
1974         wpa_supplicant_req_scan(wpa_s, 0, 0);
1975
1976         return 0;
1977 }
1978
1979
1980 static void gas_resp_cb(void *ctx, const u8 *addr, u8 dialog_token,
1981                         enum gas_query_result result,
1982                         const struct wpabuf *adv_proto,
1983                         const struct wpabuf *resp, u16 status_code)
1984 {
1985         struct wpa_supplicant *wpa_s = ctx;
1986
1987         wpa_msg(wpa_s, MSG_INFO, GAS_RESPONSE_INFO "addr=" MACSTR
1988                 " dialog_token=%d status_code=%d resp_len=%d",
1989                 MAC2STR(addr), dialog_token, status_code,
1990                 resp ? (int) wpabuf_len(resp) : -1);
1991         if (!resp)
1992                 return;
1993
1994         wpabuf_free(wpa_s->last_gas_resp);
1995         wpa_s->last_gas_resp = wpabuf_dup(resp);
1996         if (wpa_s->last_gas_resp == NULL)
1997                 return;
1998         os_memcpy(wpa_s->last_gas_addr, addr, ETH_ALEN);
1999         wpa_s->last_gas_dialog_token = dialog_token;
2000 }
2001
2002
2003 int gas_send_request(struct wpa_supplicant *wpa_s, const u8 *dst,
2004                      const struct wpabuf *adv_proto,
2005                      const struct wpabuf *query)
2006 {
2007         struct wpabuf *buf;
2008         int ret = 0;
2009         int freq;
2010         struct wpa_bss *bss;
2011         int res;
2012         size_t len;
2013         u8 query_resp_len_limit = 0, pame_bi = 0;
2014
2015         freq = wpa_s->assoc_freq;
2016         bss = wpa_bss_get_bssid(wpa_s, dst);
2017         if (bss)
2018                 freq = bss->freq;
2019         if (freq <= 0)
2020                 return -1;
2021
2022         wpa_printf(MSG_DEBUG, "GAS request to " MACSTR " (freq %d MHz)",
2023                    MAC2STR(dst), freq);
2024         wpa_hexdump_buf(MSG_DEBUG, "Advertisement Protocol ID", adv_proto);
2025         wpa_hexdump_buf(MSG_DEBUG, "GAS Query", query);
2026
2027         len = 3 + wpabuf_len(adv_proto) + 2;
2028         if (query)
2029                 len += wpabuf_len(query);
2030         buf = gas_build_initial_req(0, len);
2031         if (buf == NULL)
2032                 return -1;
2033
2034         /* Advertisement Protocol IE */
2035         wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
2036         wpabuf_put_u8(buf, 1 + wpabuf_len(adv_proto)); /* Length */
2037         wpabuf_put_u8(buf, (query_resp_len_limit & 0x7f) |
2038                       (pame_bi ? 0x80 : 0));
2039         wpabuf_put_buf(buf, adv_proto);
2040
2041         /* GAS Query */
2042         if (query) {
2043                 wpabuf_put_le16(buf, wpabuf_len(query));
2044                 wpabuf_put_buf(buf, query);
2045         } else
2046                 wpabuf_put_le16(buf, 0);
2047
2048         res = gas_query_req(wpa_s->gas, dst, freq, buf, gas_resp_cb, wpa_s);
2049         if (res < 0) {
2050                 wpa_printf(MSG_DEBUG, "GAS: Failed to send Query Request");
2051                 ret = -1;
2052         } else
2053                 wpa_printf(MSG_DEBUG, "GAS: Query started with dialog token "
2054                            "%u", res);
2055
2056         wpabuf_free(buf);
2057         return ret;
2058 }