wpa_supplicant/interworking.c

   1 /*
   2  * Interworking (IEEE 802.11u)
   3  * Copyright (c) 2011, Qualcomm Atheros
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "common/gas.h"
  20 #include "common/wpa_ctrl.h"
  21 #include "drivers/driver.h"
  22 #include "eap_common/eap_defs.h"
  23 #include "eap_peer/eap_methods.h"
  24 #include "wpa_supplicant_i.h"
  25 #include "config.h"
  26 #include "bss.h"
  27 #include "scan.h"
  28 #include "notify.h"
  29 #include "gas_query.h"
  30 #include "interworking.h"
  31
  32
  33 #if defined(EAP_SIM) | defined(EAP_SIM_DYNAMIC)
  34 #define INTERWORKING_3GPP
  35 #else
  36 #if defined(EAP_AKA) | defined(EAP_AKA_DYNAMIC)
  37 #define INTERWORKING_3GPP
  38 #else
  39 #if defined(EAP_AKA_PRIME) | defined(EAP_AKA_PRIME_DYNAMIC)
  40 #define INTERWORKING_3GPP
  41 #endif
  42 #endif
  43 #endif
  44
  45 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);
  46
  47
  48 static struct wpabuf * anqp_build_req(u16 info_ids[], size_t num_ids,
  49                                       struct wpabuf *extra)
  50 {
  51         struct wpabuf *buf;
  52         size_t i;
  53         u8 *len_pos;
  54
  55         buf = gas_anqp_build_initial_req(0, 4 + num_ids * 2 +
  56                                          (extra ? wpabuf_len(extra) : 0));
  57         if (buf == NULL)
  58                 return NULL;
  59
  60         len_pos = gas_anqp_add_element(buf, ANQP_QUERY_LIST);
  61         for (i = 0; i < num_ids; i++)
  62                 wpabuf_put_le16(buf, info_ids[i]);
  63         gas_anqp_set_element_len(buf, len_pos);
  64         if (extra)
  65                 wpabuf_put_buf(buf, extra);
  66
  67         gas_anqp_set_len(buf);
  68
  69         return buf;
  70 }
  71
  72
  73 static void interworking_anqp_resp_cb(void *ctx, const u8 *dst,
  74                                       u8 dialog_token,
  75                                       enum gas_query_result result,
  76                                       const struct wpabuf *adv_proto,
  77                                       const struct wpabuf *resp,
  78                                       u16 status_code)
  79 {
  80         struct wpa_supplicant *wpa_s = ctx;
  81
  82         anqp_resp_cb(wpa_s, dst, dialog_token, result, adv_proto, resp,
  83                      status_code);
  84         interworking_next_anqp_fetch(wpa_s);
  85 }
  86
  87
  88 static int interworking_anqp_send_req(struct wpa_supplicant *wpa_s,
  89                                       struct wpa_bss *bss)
  90 {
  91         struct wpabuf *buf;
  92         int ret = 0;
  93         int res;
  94         u16 info_ids[] = {
  95                 ANQP_CAPABILITY_LIST,
  96                 ANQP_VENUE_NAME,
  97                 ANQP_NETWORK_AUTH_TYPE,
  98                 ANQP_ROAMING_CONSORTIUM,
  99                 ANQP_IP_ADDR_TYPE_AVAILABILITY,
 100                 ANQP_NAI_REALM,
 101                 ANQP_3GPP_CELLULAR_NETWORK,
 102                 ANQP_DOMAIN_NAME
 103         };
 104         struct wpabuf *extra = NULL;
 105
 106         wpa_printf(MSG_DEBUG, "Interworking: ANQP Query Request to " MACSTR,
 107                    MAC2STR(bss->bssid));
 108
 109         buf = anqp_build_req(info_ids, sizeof(info_ids) / sizeof(info_ids[0]),
 110                              extra);
 111         wpabuf_free(extra);
 112         if (buf == NULL)
 113                 return -1;
 114
 115         res = gas_query_req(wpa_s->gas, bss->bssid, bss->freq, buf,
 116                             interworking_anqp_resp_cb, wpa_s);
 117         if (res < 0) {
 118                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
 119                 ret = -1;
 120         } else
 121                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
 122                            "%u", res);
 123
 124         wpabuf_free(buf);
 125         return ret;
 126 }
 127
 128
 129 struct nai_realm_eap {
 130         u8 method;
 131         u8 inner_method;
 132         enum nai_realm_eap_auth_inner_non_eap inner_non_eap;
 133         u8 cred_type;
 134         u8 tunneled_cred_type;
 135 };
 136
 137 struct nai_realm {
 138         u8 encoding;
 139         char *realm;
 140         u8 eap_count;
 141         struct nai_realm_eap *eap;
 142 };
 143
 144
 145 static void nai_realm_free(struct nai_realm *realms, u16 count)
 146 {
 147         u16 i;
 148
 149         if (realms == NULL)
 150                 return;
 151         for (i = 0; i < count; i++) {
 152                 os_free(realms[i].eap);
 153                 os_free(realms[i].realm);
 154         }
 155         os_free(realms);
 156 }
 157
 158
 159 static const u8 * nai_realm_parse_eap(struct nai_realm_eap *e, const u8 *pos,
 160                                       const u8 *end)
 161 {
 162         u8 elen, auth_count, a;
 163         const u8 *e_end;
 164
 165         if (pos + 3 > end) {
 166                 wpa_printf(MSG_DEBUG, "No room for EAP Method fixed fields");
 167                 return NULL;
 168         }
 169
 170         elen = *pos++;
 171         if (pos + elen > end || elen < 2) {
 172                 wpa_printf(MSG_DEBUG, "No room for EAP Method subfield");
 173                 return NULL;
 174         }
 175         e_end = pos + elen;
 176         e->method = *pos++;
 177         auth_count = *pos++;
 178         wpa_printf(MSG_DEBUG, "EAP Method: len=%u method=%u auth_count=%u",
 179                    elen, e->method, auth_count);
 180
 181         for (a = 0; a < auth_count; a++) {
 182                 u8 id, len;
 183
 184                 if (pos + 2 > end || pos + 2 + pos[1] > end) {
 185                         wpa_printf(MSG_DEBUG, "No room for Authentication "
 186                                    "Parameter subfield");
 187                         return NULL;
 188                 }
 189
 190                 id = *pos++;
 191                 len = *pos++;
 192
 193                 switch (id) {
 194                 case NAI_REALM_EAP_AUTH_NON_EAP_INNER_AUTH:
 195                         if (len < 1)
 196                                 break;
 197                         e->inner_non_eap = *pos;
 198                         if (e->method != EAP_TYPE_TTLS)
 199                                 break;
 200                         switch (*pos) {
 201                         case NAI_REALM_INNER_NON_EAP_PAP:
 202                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP");
 203                                 break;
 204                         case NAI_REALM_INNER_NON_EAP_CHAP:
 205                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP");
 206                                 break;
 207                         case NAI_REALM_INNER_NON_EAP_MSCHAP:
 208                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP");
 209                                 break;
 210                         case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 211                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2");
 212                                 break;
 213                         }
 214                         break;
 215                 case NAI_REALM_EAP_AUTH_INNER_AUTH_EAP_METHOD:
 216                         if (len < 1)
 217                                 break;
 218                         e->inner_method = *pos;
 219                         wpa_printf(MSG_DEBUG, "Inner EAP method: %u",
 220                                    e->inner_method);
 221                         break;
 222                 case NAI_REALM_EAP_AUTH_CRED_TYPE:
 223                         if (len < 1)
 224                                 break;
 225                         e->cred_type = *pos;
 226                         wpa_printf(MSG_DEBUG, "Credential Type: %u",
 227                                    e->cred_type);
 228                         break;
 229                 case NAI_REALM_EAP_AUTH_TUNNELED_CRED_TYPE:
 230                         if (len < 1)
 231                                 break;
 232                         e->tunneled_cred_type = *pos;
 233                         wpa_printf(MSG_DEBUG, "Tunneled EAP Method Credential "
 234                                    "Type: %u", e->tunneled_cred_type);
 235                         break;
 236                 default:
 237                         wpa_printf(MSG_DEBUG, "Unsupported Authentication "
 238                                    "Parameter: id=%u len=%u", id, len);
 239                         wpa_hexdump(MSG_DEBUG, "Authentication Parameter "
 240                                     "Value", pos, len);
 241                         break;
 242                 }
 243
 244                 pos += len;
 245         }
 246
 247         return e_end;
 248 }
 249
 250
 251 static const u8 * nai_realm_parse_realm(struct nai_realm *r, const u8 *pos,
 252                                         const u8 *end)
 253 {
 254         u16 len;
 255         const u8 *f_end;
 256         u8 realm_len, e;
 257
 258         if (end - pos < 4) {
 259                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 260                            "fixed fields");
 261                 return NULL;
 262         }
 263
 264         len = WPA_GET_LE16(pos); /* NAI Realm Data field Length */
 265         pos += 2;
 266         if (pos + len > end || len < 3) {
 267                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 268                            "(len=%u; left=%u)",
 269                            len, (unsigned int) (end - pos));
 270                 return NULL;
 271         }
 272         f_end = pos + len;
 273
 274         r->encoding = *pos++;
 275         realm_len = *pos++;
 276         if (pos + realm_len > f_end) {
 277                 wpa_printf(MSG_DEBUG, "No room for NAI Realm "
 278                            "(len=%u; left=%u)",
 279                            realm_len, (unsigned int) (f_end - pos));
 280                 return NULL;
 281         }
 282         wpa_hexdump_ascii(MSG_DEBUG, "NAI Realm", pos, realm_len);
 283         r->realm = os_malloc(realm_len + 1);
 284         if (r->realm == NULL)
 285                 return NULL;
 286         os_memcpy(r->realm, pos, realm_len);
 287         r->realm[realm_len] = '\0';
 288         pos += realm_len;
 289
 290         if (pos + 1 > f_end) {
 291                 wpa_printf(MSG_DEBUG, "No room for EAP Method Count");
 292                 return NULL;
 293         }
 294         r->eap_count = *pos++;
 295         wpa_printf(MSG_DEBUG, "EAP Count: %u", r->eap_count);
 296         if (pos + r->eap_count * 3 > f_end) {
 297                 wpa_printf(MSG_DEBUG, "No room for EAP Methods");
 298                 return NULL;
 299         }
 300         r->eap = os_zalloc(r->eap_count * sizeof(struct nai_realm_eap));
 301         if (r->eap == NULL)
 302                 return NULL;
 303
 304         for (e = 0; e < r->eap_count; e++) {
 305                 pos = nai_realm_parse_eap(&r->eap[e], pos, f_end);
 306                 if (pos == NULL)
 307                         return NULL;
 308         }
 309
 310         return f_end;
 311 }
 312
 313
 314 static struct nai_realm * nai_realm_parse(struct wpabuf *anqp, u16 *count)
 315 {
 316         struct nai_realm *realm;
 317         const u8 *pos, *end;
 318         u16 i, num;
 319
 320         if (anqp == NULL || wpabuf_len(anqp) < 2)
 321                 return NULL;
 322
 323         pos = wpabuf_head_u8(anqp);
 324         end = pos + wpabuf_len(anqp);
 325         num = WPA_GET_LE16(pos);
 326         wpa_printf(MSG_DEBUG, "NAI Realm Count: %u", num);
 327         pos += 2;
 328
 329         if (num * 5 > end - pos) {
 330                 wpa_printf(MSG_DEBUG, "Invalid NAI Realm Count %u - not "
 331                            "enough data (%u octets) for that many realms",
 332                            num, (unsigned int) (end - pos));
 333                 return NULL;
 334         }
 335
 336         realm = os_zalloc(num * sizeof(struct nai_realm));
 337         if (realm == NULL)
 338                 return NULL;
 339
 340         for (i = 0; i < num; i++) {
 341                 pos = nai_realm_parse_realm(&realm[i], pos, end);
 342                 if (pos == NULL) {
 343                         nai_realm_free(realm, num);
 344                         return NULL;
 345                 }
 346         }
 347
 348         *count = num;
 349         return realm;
 350 }
 351
 352
 353 static int nai_realm_match(struct nai_realm *realm, const char *home_realm)
 354 {
 355         char *tmp, *pos, *end;
 356         int match = 0;
 357
 358         if (realm->realm == NULL || home_realm == NULL)
 359                 return 0;
 360
 361         if (os_strchr(realm->realm, ';') == NULL)
 362                 return os_strcasecmp(realm->realm, home_realm) == 0;
 363
 364         tmp = os_strdup(realm->realm);
 365         if (tmp == NULL)
 366                 return 0;
 367
 368         pos = tmp;
 369         while (*pos) {
 370                 end = os_strchr(pos, ';');
 371                 if (end)
 372                         *end = '\0';
 373                 if (os_strcasecmp(pos, home_realm) == 0) {
 374                         match = 1;
 375                         break;
 376                 }
 377                 if (end == NULL)
 378                         break;
 379                 pos = end + 1;
 380         }
 381
 382         os_free(tmp);
 383
 384         return match;
 385 }
 386
 387
 388 static int nai_realm_cred_username(struct nai_realm_eap *eap)
 389 {
 390         if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL)
 391                 return 0; /* method not supported */
 392
 393         if (eap->method != EAP_TYPE_TTLS && eap->method != EAP_TYPE_PEAP) {
 394                 /* Only tunneled methods with username/password supported */
 395                 return 0;
 396         }
 397
 398         if (eap->method == EAP_TYPE_PEAP &&
 399             eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 400                 return 0;
 401
 402         if (eap->method == EAP_TYPE_TTLS) {
 403                 if (eap->inner_method == 0 && eap->inner_non_eap == 0)
 404                         return 0;
 405                 if (eap->inner_method &&
 406                     eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 407                         return 0;
 408                 if (eap->inner_non_eap &&
 409                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_PAP &&
 410                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_CHAP &&
 411                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAP &&
 412                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAPV2)
 413                         return 0;
 414         }
 415
 416         if (eap->inner_method &&
 417             eap->inner_method != EAP_TYPE_GTC &&
 418             eap->inner_method != EAP_TYPE_MSCHAPV2)
 419                 return 0;
 420
 421         return 1;
 422 }
 423
 424
 425 static struct nai_realm_eap * nai_realm_find_eap(struct wpa_supplicant *wpa_s,
 426                                                  struct nai_realm *realm)
 427 {
 428         u8 e;
 429
 430         if (wpa_s->conf->home_username == NULL ||
 431             wpa_s->conf->home_username[0] == '\0' ||
 432             wpa_s->conf->home_password == NULL ||
 433             wpa_s->conf->home_password[0] == '\0')
 434                 return NULL;
 435
 436         for (e = 0; e < realm->eap_count; e++) {
 437                 struct nai_realm_eap *eap = &realm->eap[e];
 438                 if (nai_realm_cred_username(eap))
 439                         return eap;
 440         }
 441
 442         return NULL;
 443 }
 444
 445
 446 #ifdef INTERWORKING_3GPP
 447
 448 static int plmn_id_match(struct wpabuf *anqp, const char *imsi)
 449 {
 450         const char *sep;
 451         u8 plmn[3];
 452         const u8 *pos, *end;
 453         u8 udhl;
 454
 455         sep = os_strchr(imsi, '-');
 456         if (sep == NULL || (sep - imsi != 5 && sep - imsi != 6))
 457                 return 0;
 458
 459         /* See Annex A of 3GPP TS 24.234 v8.1.0 for description */
 460         plmn[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
 461         plmn[1] = imsi[2] - '0';
 462         if (sep - imsi == 6)
 463                 plmn[1] |= (imsi[5] - '0') << 4;
 464         else
 465                 plmn[1] |= 0xf0;
 466         plmn[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);
 467
 468         if (anqp == NULL)
 469                 return 0;
 470         pos = wpabuf_head_u8(anqp);
 471         end = pos + wpabuf_len(anqp);
 472         if (pos + 2 > end)
 473                 return 0;
 474         if (*pos != 0) {
 475                 wpa_printf(MSG_DEBUG, "Unsupported GUD version 0x%x", *pos);
 476                 return 0;
 477         }
 478         pos++;
 479         udhl = *pos++;
 480         if (pos + udhl > end) {
 481                 wpa_printf(MSG_DEBUG, "Invalid UDHL");
 482                 return 0;
 483         }
 484         end = pos + udhl;
 485
 486         while (pos + 2 <= end) {
 487                 u8 iei, len;
 488                 const u8 *l_end;
 489                 iei = *pos++;
 490                 len = *pos++ & 0x7f;
 491                 if (pos + len > end)
 492                         break;
 493                 l_end = pos + len;
 494
 495                 if (iei == 0 && len > 0) {
 496                         /* PLMN List */
 497                         u8 num, i;
 498                         num = *pos++;
 499                         for (i = 0; i < num; i++) {
 500                                 if (pos + 3 > end)
 501                                         break;
 502                                 if (os_memcmp(pos, plmn, 3) == 0)
 503                                         return 1; /* Found matching PLMN */
 504                         }
 505                 }
 506
 507                 pos = l_end;
 508         }
 509
 510         return 0;
 511 }
 512
 513
 514 static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
 515 {
 516         const char *sep, *msin;
 517         char nai[100], *end, *pos;
 518         size_t msin_len, plmn_len;
 519
 520         /*
 521          * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
 522          * Root NAI:
 523          * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
 524          * <MNC> is zero-padded to three digits in case two-digit MNC is used
 525          */
 526
 527         if (imsi == NULL || os_strlen(imsi) > 16) {
 528                 wpa_printf(MSG_DEBUG, "No valid IMSI available");
 529                 return -1;
 530         }
 531         sep = os_strchr(imsi, '-');
 532         if (sep == NULL)
 533                 return -1;
 534         plmn_len = sep - imsi;
 535         if (plmn_len != 5 && plmn_len != 6)
 536                 return -1;
 537         msin = sep + 1;
 538         msin_len = os_strlen(msin);
 539
 540         pos = nai;
 541         end = pos + sizeof(nai);
 542         *pos++ = prefix;
 543         os_memcpy(pos, imsi, plmn_len);
 544         pos += plmn_len;
 545         os_memcpy(pos, msin, msin_len);
 546         pos += msin_len;
 547         pos += os_snprintf(pos, end - pos, "@wlan.mnc");
 548         if (plmn_len == 5) {
 549                 *pos++ = '0';
 550                 *pos++ = imsi[3];
 551                 *pos++ = imsi[4];
 552         } else {
 553                 *pos++ = imsi[3];
 554                 *pos++ = imsi[4];
 555                 *pos++ = imsi[5];
 556         }
 557         pos += os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
 558                            imsi[0], imsi[1], imsi[2]);
 559
 560         return wpa_config_set_quoted(ssid, "identity", nai);
 561 }
 562
 563 #endif /* INTERWORKING_3GPP */
 564
 565
 566 static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
 567                                      struct wpa_bss *bss)
 568 {
 569 #ifdef INTERWORKING_3GPP
 570         struct wpa_ssid *ssid;
 571         const u8 *ie;
 572
 573         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 574         if (ie == NULL)
 575                 return -1;
 576         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " (3GPP)",
 577                    MAC2STR(bss->bssid));
 578
 579         ssid = wpa_config_add_network(wpa_s->conf);
 580         if (ssid == NULL)
 581                 return -1;
 582
 583         wpas_notify_network_added(wpa_s, ssid);
 584         wpa_config_set_network_defaults(ssid);
 585         ssid->temporary = 1;
 586         ssid->ssid = os_zalloc(ie[1] + 1);
 587         if (ssid->ssid == NULL)
 588                 goto fail;
 589         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 590         ssid->ssid_len = ie[1];
 591
 592         /* TODO: figure out whether to use EAP-SIM, EAP-AKA, or EAP-AKA' */
 593         if (wpa_config_set(ssid, "eap", "SIM", 0) < 0) {
 594                 wpa_printf(MSG_DEBUG, "EAP-SIM not supported");
 595                 goto fail;
 596         }
 597         if (set_root_nai(ssid, wpa_s->conf->home_imsi, '1') < 0) {
 598                 wpa_printf(MSG_DEBUG, "Failed to set Root NAI");
 599                 goto fail;
 600         }
 601
 602         if (wpa_s->conf->home_milenage && wpa_s->conf->home_milenage[0]) {
 603                 if (wpa_config_set_quoted(ssid, "password",
 604                                           wpa_s->conf->home_milenage) < 0)
 605                         goto fail;
 606         } else {
 607                 /* TODO: PIN */
 608                 if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
 609                         goto fail;
 610         }
 611
 612         if (wpa_s->conf->home_password && wpa_s->conf->home_password[0] &&
 613             wpa_config_set_quoted(ssid, "password", wpa_s->conf->home_password)
 614             < 0)
 615                 goto fail;
 616
 617         wpa_supplicant_select_network(wpa_s, ssid);
 618
 619         return 0;
 620
 621 fail:
 622         wpas_notify_network_removed(wpa_s, ssid);
 623         wpa_config_remove_network(wpa_s->conf, ssid->id);
 624 #endif /* INTERWORKING_3GPP */
 625         return -1;
 626 }
 627
 628
 629 int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 630 {
 631         struct wpa_ssid *ssid;
 632         struct nai_realm *realm;
 633         struct nai_realm_eap *eap = NULL;
 634         u16 count, i;
 635         char buf[100];
 636         const u8 *ie;
 637
 638         if (bss == NULL)
 639                 return -1;
 640         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 641         if (ie == NULL || ie[1] == 0) {
 642                 wpa_printf(MSG_DEBUG, "Interworking: No SSID known for "
 643                            MACSTR, MAC2STR(bss->bssid));
 644                 return -1;
 645         }
 646
 647         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 648         if (realm == NULL) {
 649                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 650                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 651                 count = 0;
 652         }
 653
 654         for (i = 0; i < count; i++) {
 655                 if (!nai_realm_match(&realm[i], wpa_s->conf->home_realm))
 656                         continue;
 657                 eap = nai_realm_find_eap(wpa_s, &realm[i]);
 658                 if (eap)
 659                         break;
 660         }
 661
 662         if (!eap) {
 663                 if (interworking_connect_3gpp(wpa_s, bss) == 0) {
 664                         if (realm)
 665                                 nai_realm_free(realm, count);
 666                         return 0;
 667                 }
 668
 669                 wpa_printf(MSG_DEBUG, "Interworking: No matching credentials "
 670                            "and EAP method found for " MACSTR,
 671                            MAC2STR(bss->bssid));
 672                 nai_realm_free(realm, count);
 673                 return -1;
 674         }
 675
 676         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR,
 677                    MAC2STR(bss->bssid));
 678
 679         ssid = wpa_config_add_network(wpa_s->conf);
 680         if (ssid == NULL) {
 681                 nai_realm_free(realm, count);
 682                 return -1;
 683         }
 684         wpas_notify_network_added(wpa_s, ssid);
 685         wpa_config_set_network_defaults(ssid);
 686         ssid->temporary = 1;
 687         ssid->ssid = os_zalloc(ie[1] + 1);
 688         if (ssid->ssid == NULL)
 689                 goto fail;
 690         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 691         ssid->ssid_len = ie[1];
 692
 693         if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
 694                                                      eap->method), 0) < 0)
 695                 goto fail;
 696
 697         if (wpa_s->conf->home_username && wpa_s->conf->home_username[0] &&
 698             wpa_config_set_quoted(ssid, "identity",
 699                                   wpa_s->conf->home_username) < 0)
 700                 goto fail;
 701
 702         if (wpa_s->conf->home_password && wpa_s->conf->home_password[0] &&
 703             wpa_config_set_quoted(ssid, "password", wpa_s->conf->home_password)
 704             < 0)
 705                 goto fail;
 706
 707         switch (eap->method) {
 708         case EAP_TYPE_TTLS:
 709                 if (eap->inner_method) {
 710                         os_snprintf(buf, sizeof(buf), "\"autheap=%s\"",
 711                                     eap_get_name(EAP_VENDOR_IETF,
 712                                                  eap->inner_method));
 713                         if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 714                                 goto fail;
 715                         break;
 716                 }
 717                 switch (eap->inner_non_eap) {
 718                 case NAI_REALM_INNER_NON_EAP_PAP:
 719                         if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
 720                             0)
 721                                 goto fail;
 722                         break;
 723                 case NAI_REALM_INNER_NON_EAP_CHAP:
 724                         if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
 725                             < 0)
 726                                 goto fail;
 727                         break;
 728                 case NAI_REALM_INNER_NON_EAP_MSCHAP:
 729                         if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
 730                             < 0)
 731                                 goto fail;
 732                         break;
 733                 case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 734                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
 735                                            0) < 0)
 736                                 goto fail;
 737                         break;
 738                 }
 739                 break;
 740         case EAP_TYPE_PEAP:
 741                 os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
 742                             eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
 743                 if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 744                         goto fail;
 745                 break;
 746         }
 747
 748         if (wpa_s->conf->home_ca_cert && wpa_s->conf->home_ca_cert[0] &&
 749             wpa_config_set_quoted(ssid, "ca_cert", wpa_s->conf->home_ca_cert) <
 750             0)
 751                 goto fail;
 752
 753         nai_realm_free(realm, count);
 754
 755         wpa_supplicant_select_network(wpa_s, ssid);
 756
 757         return 0;
 758
 759 fail:
 760         wpas_notify_network_removed(wpa_s, ssid);
 761         wpa_config_remove_network(wpa_s->conf, ssid->id);
 762         nai_realm_free(realm, count);
 763         return -1;
 764 }
 765
 766
 767 static int interworking_credentials_available_3gpp(
 768         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 769 {
 770         int ret = 0;
 771
 772 #ifdef INTERWORKING_3GPP
 773         if (bss->anqp_3gpp == NULL)
 774                 return ret;
 775
 776         if (wpa_s->conf->home_imsi == NULL || !wpa_s->conf->home_imsi[0] ||
 777             wpa_s->conf->home_milenage == NULL ||
 778             !wpa_s->conf->home_milenage[0])
 779                 return ret;
 780
 781         wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from " MACSTR,
 782                    MAC2STR(bss->bssid));
 783         ret = plmn_id_match(bss->anqp_3gpp, wpa_s->conf->home_imsi);
 784         wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
 785 #endif /* INTERWORKING_3GPP */
 786         return ret;
 787 }
 788
 789
 790 static int interworking_credentials_available_realm(
 791         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 792 {
 793         struct nai_realm *realm;
 794         u16 count, i;
 795         int found = 0;
 796
 797         if (bss->anqp_nai_realm == NULL)
 798                 return 0;
 799
 800         if (wpa_s->conf->home_realm == NULL)
 801                 return 0;
 802
 803         wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
 804                    MACSTR, MAC2STR(bss->bssid));
 805         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 806         if (realm == NULL) {
 807                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 808                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 809                 return 0;
 810         }
 811
 812         for (i = 0; i < count; i++) {
 813                 if (!nai_realm_match(&realm[i], wpa_s->conf->home_realm))
 814                         continue;
 815                 if (nai_realm_find_eap(wpa_s, &realm[i])) {
 816                         found++;
 817                         break;
 818                 }
 819         }
 820
 821         nai_realm_free(realm, count);
 822
 823         return found;
 824 }
 825
 826
 827 static int interworking_credentials_available(struct wpa_supplicant *wpa_s,
 828                                               struct wpa_bss *bss)
 829 {
 830         return interworking_credentials_available_realm(wpa_s, bss) ||
 831                 interworking_credentials_available_3gpp(wpa_s, bss);
 832 }
 833
 834
 835 static void interworking_select_network(struct wpa_supplicant *wpa_s)
 836 {
 837         struct wpa_bss *bss, *selected = NULL;
 838         unsigned int count = 0;
 839
 840         wpa_s->network_select = 0;
 841
 842         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 843                 if (!interworking_credentials_available(wpa_s, bss))
 844                         continue;
 845                 count++;
 846                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR,
 847                         MAC2STR(bss->bssid));
 848                 if (selected == NULL && wpa_s->auto_select)
 849                         selected = bss;
 850         }
 851
 852         if (count == 0) {
 853                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
 854                         "with matching credentials found");
 855         }
 856
 857         if (selected)
 858                 interworking_connect(wpa_s, selected);
 859 }
 860
 861
 862 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
 863 {
 864         struct wpa_bss *bss;
 865         int found = 0;
 866         const u8 *ie;
 867
 868         if (!wpa_s->fetch_anqp_in_progress)
 869                 return;
 870
 871         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 872                 if (!(bss->caps & IEEE80211_CAP_ESS))
 873                         continue;
 874                 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
 875                 if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
 876                         continue; /* AP does not support Interworking */
 877
 878                 if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
 879                         found++;
 880                         bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
 881                         wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
 882                                 MACSTR, MAC2STR(bss->bssid));
 883                         interworking_anqp_send_req(wpa_s, bss);
 884                         break;
 885                 }
 886         }
 887
 888         if (found == 0) {
 889                 wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
 890                 wpa_s->fetch_anqp_in_progress = 0;
 891                 if (wpa_s->network_select)
 892                         interworking_select_network(wpa_s);
 893         }
 894 }
 895
 896
 897 static void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
 898 {
 899         struct wpa_bss *bss;
 900
 901         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
 902                 bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
 903
 904         wpa_s->fetch_anqp_in_progress = 1;
 905         interworking_next_anqp_fetch(wpa_s);
 906 }
 907
 908
 909 int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
 910 {
 911         if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
 912                 return 0;
 913
 914         wpa_s->network_select = 0;
 915
 916         interworking_start_fetch_anqp(wpa_s);
 917
 918         return 0;
 919 }
 920
 921
 922 void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
 923 {
 924         if (!wpa_s->fetch_anqp_in_progress)
 925                 return;
 926
 927         wpa_s->fetch_anqp_in_progress = 0;
 928 }
 929
 930
 931 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
 932                   u16 info_ids[], size_t num_ids)
 933 {
 934         struct wpabuf *buf;
 935         int ret = 0;
 936         int freq;
 937         struct wpa_bss *bss;
 938         int res;
 939
 940         freq = wpa_s->assoc_freq;
 941         bss = wpa_bss_get_bssid(wpa_s, dst);
 942         if (bss)
 943                 freq = bss->freq;
 944         if (freq <= 0)
 945                 return -1;
 946
 947         wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
 948                    MAC2STR(dst), (unsigned int) num_ids);
 949
 950         buf = anqp_build_req(info_ids, num_ids, NULL);
 951         if (buf == NULL)
 952                 return -1;
 953
 954         res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
 955         if (res < 0) {
 956                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
 957                 ret = -1;
 958         } else
 959                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
 960                            "%u", res);
 961
 962         wpabuf_free(buf);
 963         return ret;
 964 }
 965
 966
 967 static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
 968                                             const u8 *sa, u16 info_id,
 969                                             const u8 *data, size_t slen)
 970 {
 971         const u8 *pos = data;
 972         struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);
 973
 974         switch (info_id) {
 975         case ANQP_CAPABILITY_LIST:
 976                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
 977                         " ANQP Capability list", MAC2STR(sa));
 978                 break;
 979         case ANQP_VENUE_NAME:
 980                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
 981                         " Venue Name", MAC2STR(sa));
 982                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
 983                 if (bss) {
 984                         wpabuf_free(bss->anqp_venue_name);
 985                         bss->anqp_venue_name = wpabuf_alloc_copy(pos, slen);
 986                 }
 987                 break;
 988         case ANQP_NETWORK_AUTH_TYPE:
 989                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
 990                         " Network Authentication Type information",
 991                         MAC2STR(sa));
 992                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
 993                                   "Type", pos, slen);
 994                 if (bss) {
 995                         wpabuf_free(bss->anqp_network_auth_type);
 996                         bss->anqp_network_auth_type =
 997                                 wpabuf_alloc_copy(pos, slen);
 998                 }
 999                 break;
1000         case ANQP_ROAMING_CONSORTIUM:
1001                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1002                         " Roaming Consortium list", MAC2STR(sa));
1003                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
1004                                   pos, slen);
1005                 if (bss) {
1006                         wpabuf_free(bss->anqp_roaming_consortium);
1007                         bss->anqp_roaming_consortium =
1008                                 wpabuf_alloc_copy(pos, slen);
1009                 }
1010                 break;
1011         case ANQP_IP_ADDR_TYPE_AVAILABILITY:
1012                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1013                         " IP Address Type Availability information",
1014                         MAC2STR(sa));
1015                 wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
1016                             pos, slen);
1017                 if (bss) {
1018                         wpabuf_free(bss->anqp_ip_addr_type_availability);
1019                         bss->anqp_ip_addr_type_availability =
1020                                 wpabuf_alloc_copy(pos, slen);
1021                 }
1022                 break;
1023         case ANQP_NAI_REALM:
1024                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1025                         " NAI Realm list", MAC2STR(sa));
1026                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
1027                 if (bss) {
1028                         wpabuf_free(bss->anqp_nai_realm);
1029                         bss->anqp_nai_realm = wpabuf_alloc_copy(pos, slen);
1030                 }
1031                 break;
1032         case ANQP_3GPP_CELLULAR_NETWORK:
1033                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1034                         " 3GPP Cellular Network information", MAC2STR(sa));
1035                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
1036                                   pos, slen);
1037                 if (bss) {
1038                         wpabuf_free(bss->anqp_3gpp);
1039                         bss->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
1040                 }
1041                 break;
1042         case ANQP_DOMAIN_NAME:
1043                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1044                         " Domain Name list", MAC2STR(sa));
1045                 wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
1046                 if (bss) {
1047                         wpabuf_free(bss->anqp_domain_name);
1048                         bss->anqp_domain_name = wpabuf_alloc_copy(pos, slen);
1049                 }
1050                 break;
1051         case ANQP_VENDOR_SPECIFIC:
1052                 if (slen < 3)
1053                         return;
1054
1055                 switch (WPA_GET_BE24(pos)) {
1056                 default:
1057                         wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
1058                                    "vendor-specific ANQP OUI %06x",
1059                                    WPA_GET_BE24(pos));
1060                         return;
1061                 }
1062                 break;
1063         default:
1064                 wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
1065                            "%u", info_id);
1066                 break;
1067         }
1068 }
1069
1070
1071 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
1072                   enum gas_query_result result,
1073                   const struct wpabuf *adv_proto,
1074                   const struct wpabuf *resp, u16 status_code)
1075 {
1076         struct wpa_supplicant *wpa_s = ctx;
1077         const u8 *pos;
1078         const u8 *end;
1079         u16 info_id;
1080         u16 slen;
1081
1082         if (result != GAS_QUERY_SUCCESS)
1083                 return;
1084
1085         pos = wpabuf_head(adv_proto);
1086         if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
1087             pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
1088                 wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
1089                            "Protocol in response");
1090                 return;
1091         }
1092
1093         pos = wpabuf_head(resp);
1094         end = pos + wpabuf_len(resp);
1095
1096         while (pos < end) {
1097                 if (pos + 4 > end) {
1098                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
1099                         break;
1100                 }
1101                 info_id = WPA_GET_LE16(pos);
1102                 pos += 2;
1103                 slen = WPA_GET_LE16(pos);
1104                 pos += 2;
1105                 if (pos + slen > end) {
1106                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
1107                                    "for Info ID %u", info_id);
1108                         break;
1109                 }
1110                 interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
1111                                                 slen);
1112                 pos += slen;
1113         }
1114 }
1115
1116
1117 static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
1118                                           struct wpa_scan_results *scan_res)
1119 {
1120         wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
1121                    "ANQP fetch");
1122         interworking_start_fetch_anqp(wpa_s);
1123 }
1124
1125
1126 int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
1127 {
1128         interworking_stop_fetch_anqp(wpa_s);
1129         wpa_s->network_select = 1;
1130         wpa_s->auto_select = !!auto_select;
1131         wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
1132                    "selection");
1133         wpa_s->scan_res_handler = interworking_scan_res_handler;
1134         wpa_s->scan_req = 2;
1135         wpa_supplicant_req_scan(wpa_s, 0, 0);
1136
1137         return 0;
1138 }