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