fragattacks/wpa_supplicant/interworking.c

/*
 * Interworking (IEEE 802.11u)
 * Copyright (c) 2011, Qualcomm Atheros
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "common/ieee802_11_defs.h"
#include "common/gas.h"
#include "common/wpa_ctrl.h"
#include "drivers/driver.h"
#include "eap_common/eap_defs.h"
#include "eap_peer/eap_methods.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "bss.h"
#include "scan.h"
#include "notify.h"
#include "gas_query.h"
#include "interworking.h"


#if defined(EAP_SIM) | defined(EAP_SIM_DYNAMIC)
#define INTERWORKING_3GPP
#else
#if defined(EAP_AKA) | defined(EAP_AKA_DYNAMIC)
#define INTERWORKING_3GPP
#else
#if defined(EAP_AKA_PRIME) | defined(EAP_AKA_PRIME_DYNAMIC)
#define INTERWORKING_3GPP
#endif
#endif
#endif

static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);


static struct wpabuf * anqp_build_req(u16 info_ids[], size_t num_ids,
				      struct wpabuf *extra)
{
	struct wpabuf *buf;
	size_t i;
	u8 *len_pos;

	buf = gas_anqp_build_initial_req(0, 4 + num_ids * 2 +
					 (extra ? wpabuf_len(extra) : 0));
	if (buf == NULL)
		return NULL;

	len_pos = gas_anqp_add_element(buf, ANQP_QUERY_LIST);
	for (i = 0; i < num_ids; i++)
		wpabuf_put_le16(buf, info_ids[i]);
	gas_anqp_set_element_len(buf, len_pos);
	if (extra)
		wpabuf_put_buf(buf, extra);

	gas_anqp_set_len(buf);

	return buf;
}


static void interworking_anqp_resp_cb(void *ctx, const u8 *dst,
				      u8 dialog_token,
				      enum gas_query_result result,
				      const struct wpabuf *adv_proto,
				      const struct wpabuf *resp,
				      u16 status_code)
{
	struct wpa_supplicant *wpa_s = ctx;

	anqp_resp_cb(wpa_s, dst, dialog_token, result, adv_proto, resp,
		     status_code);
	interworking_next_anqp_fetch(wpa_s);
}


static int interworking_anqp_send_req(struct wpa_supplicant *wpa_s,
				      struct wpa_bss *bss)
{
	struct wpabuf *buf;
	int ret = 0;
	int res;
	u16 info_ids[] = {
		ANQP_CAPABILITY_LIST,
		ANQP_VENUE_NAME,
		ANQP_NETWORK_AUTH_TYPE,
		ANQP_ROAMING_CONSORTIUM,
		ANQP_IP_ADDR_TYPE_AVAILABILITY,
		ANQP_NAI_REALM,
		ANQP_3GPP_CELLULAR_NETWORK,
		ANQP_DOMAIN_NAME
	};
	struct wpabuf *extra = NULL;

	wpa_printf(MSG_DEBUG, "Interworking: ANQP Query Request to " MACSTR,
		   MAC2STR(bss->bssid));

	buf = anqp_build_req(info_ids, sizeof(info_ids) / sizeof(info_ids[0]),
			     extra);
	wpabuf_free(extra);
	if (buf == NULL)
		return -1;

	res = gas_query_req(wpa_s->gas, bss->bssid, bss->freq, buf,
			    interworking_anqp_resp_cb, wpa_s);
	if (res < 0) {
		wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
		ret = -1;
	} else
		wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
			   "%u", res);

	wpabuf_free(buf);
	return ret;
}


struct nai_realm_eap {
	u8 method;
	u8 inner_method;
	enum nai_realm_eap_auth_inner_non_eap inner_non_eap;
	u8 cred_type;
	u8 tunneled_cred_type;
};

struct nai_realm {
	u8 encoding;
	char *realm;
	u8 eap_count;
	struct nai_realm_eap *eap;
};


static void nai_realm_free(struct nai_realm *realms, u16 count)
{
	u16 i;

	if (realms == NULL)
		return;
	for (i = 0; i < count; i++) {
		os_free(realms[i].eap);
		os_free(realms[i].realm);
	}
	os_free(realms);
}


static const u8 * nai_realm_parse_eap(struct nai_realm_eap *e, const u8 *pos,
				      const u8 *end)
{
	u8 elen, auth_count, a;
	const u8 *e_end;

	if (pos + 3 > end) {
		wpa_printf(MSG_DEBUG, "No room for EAP Method fixed fields");
		return NULL;
	}

	elen = *pos++;
	if (pos + elen > end || elen < 2) {
		wpa_printf(MSG_DEBUG, "No room for EAP Method subfield");
		return NULL;
	}
	e_end = pos + elen;
	e->method = *pos++;
	auth_count = *pos++;
	wpa_printf(MSG_DEBUG, "EAP Method: len=%u method=%u auth_count=%u",
		   elen, e->method, auth_count);

	for (a = 0; a < auth_count; a++) {
		u8 id, len;

		if (pos + 2 > end || pos + 2 + pos[1] > end) {
			wpa_printf(MSG_DEBUG, "No room for Authentication "
				   "Parameter subfield");
			return NULL;
		}

		id = *pos++;
		len = *pos++;

		switch (id) {
		case NAI_REALM_EAP_AUTH_NON_EAP_INNER_AUTH:
			if (len < 1)
				break;
			e->inner_non_eap = *pos;
			if (e->method != EAP_TYPE_TTLS)
				break;
			switch (*pos) {
			case NAI_REALM_INNER_NON_EAP_PAP:
				wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP");
				break;
			case NAI_REALM_INNER_NON_EAP_CHAP:
				wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP");
				break;
			case NAI_REALM_INNER_NON_EAP_MSCHAP:
				wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP");
				break;
			case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
				wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2");
				break;
			}
			break;
		case NAI_REALM_EAP_AUTH_INNER_AUTH_EAP_METHOD:
			if (len < 1)
				break;
			e->inner_method = *pos;
			wpa_printf(MSG_DEBUG, "Inner EAP method: %u",
				   e->inner_method);
			break;
		case NAI_REALM_EAP_AUTH_CRED_TYPE:
			if (len < 1)
				break;
			e->cred_type = *pos;
			wpa_printf(MSG_DEBUG, "Credential Type: %u",
				   e->cred_type);
			break;
		case NAI_REALM_EAP_AUTH_TUNNELED_CRED_TYPE:
			if (len < 1)
				break;
			e->tunneled_cred_type = *pos;
			wpa_printf(MSG_DEBUG, "Tunneled EAP Method Credential "
				   "Type: %u", e->tunneled_cred_type);
			break;
		default:
			wpa_printf(MSG_DEBUG, "Unsupported Authentication "
				   "Parameter: id=%u len=%u", id, len);
			wpa_hexdump(MSG_DEBUG, "Authentication Parameter "
				    "Value", pos, len);
			break;
		}

		pos += len;
	}

	return e_end;
}


static const u8 * nai_realm_parse_realm(struct nai_realm *r, const u8 *pos,
					const u8 *end)
{
	u16 len;
	const u8 *f_end;
	u8 realm_len, e;

	if (end - pos < 4) {
		wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
			   "fixed fields");
		return NULL;
	}

	len = WPA_GET_LE16(pos); /* NAI Realm Data field Length */
	pos += 2;
	if (pos + len > end || len < 3) {
		wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
			   "(len=%u; left=%u)",
			   len, (unsigned int) (end - pos));
		return NULL;
	}
	f_end = pos + len;

	r->encoding = *pos++;
	realm_len = *pos++;
	if (pos + realm_len > f_end) {
		wpa_printf(MSG_DEBUG, "No room for NAI Realm "
			   "(len=%u; left=%u)",
			   realm_len, (unsigned int) (f_end - pos));
		return NULL;
	}
	wpa_hexdump_ascii(MSG_DEBUG, "NAI Realm", pos, realm_len);
	r->realm = os_malloc(realm_len + 1);
	if (r->realm == NULL)
		return NULL;
	os_memcpy(r->realm, pos, realm_len);
	r->realm[realm_len] = '\0';
	pos += realm_len;

	if (pos + 1 > f_end) {
		wpa_printf(MSG_DEBUG, "No room for EAP Method Count");
		return NULL;
	}
	r->eap_count = *pos++;
	wpa_printf(MSG_DEBUG, "EAP Count: %u", r->eap_count);
	if (pos + r->eap_count * 3 > f_end) {
		wpa_printf(MSG_DEBUG, "No room for EAP Methods");
		return NULL;
	}
	r->eap = os_zalloc(r->eap_count * sizeof(struct nai_realm_eap));
	if (r->eap == NULL)
		return NULL;

	for (e = 0; e < r->eap_count; e++) {
		pos = nai_realm_parse_eap(&r->eap[e], pos, f_end);
		if (pos == NULL)
			return NULL;
	}

	return f_end;
}


static struct nai_realm * nai_realm_parse(struct wpabuf *anqp, u16 *count)
{
	struct nai_realm *realm;
	const u8 *pos, *end;
	u16 i, num;

	if (anqp == NULL || wpabuf_len(anqp) < 2)
		return NULL;

	pos = wpabuf_head_u8(anqp);
	end = pos + wpabuf_len(anqp);
	num = WPA_GET_LE16(pos);
	wpa_printf(MSG_DEBUG, "NAI Realm Count: %u", num);
	pos += 2;

	if (num * 5 > end - pos) {
		wpa_printf(MSG_DEBUG, "Invalid NAI Realm Count %u - not "
			   "enough data (%u octets) for that many realms",
			   num, (unsigned int) (end - pos));
		return NULL;
	}

	realm = os_zalloc(num * sizeof(struct nai_realm));
	if (realm == NULL)
		return NULL;

	for (i = 0; i < num; i++) {
		pos = nai_realm_parse_realm(&realm[i], pos, end);
		if (pos == NULL) {
			nai_realm_free(realm, num);
			return NULL;
		}
	}

	*count = num;
	return realm;
}


static int nai_realm_match(struct nai_realm *realm, const char *home_realm)
{
	char *tmp, *pos, *end;
	int match = 0;

	if (realm->realm == NULL || home_realm == NULL)
		return 0;

	if (os_strchr(realm->realm, ';') == NULL)
		return os_strcasecmp(realm->realm, home_realm) == 0;

	tmp = os_strdup(realm->realm);
	if (tmp == NULL)
		return 0;

	pos = tmp;
	while (*pos) {
		end = os_strchr(pos, ';');
		if (end)
			*end = '\0';
		if (os_strcasecmp(pos, home_realm) == 0) {
			match = 1;
			break;
		}
		if (end == NULL)
			break;
		pos = end + 1;
	}

	os_free(tmp);

	return match;
}


static int nai_realm_cred_username(struct nai_realm_eap *eap)
{
	if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL)
		return 0; /* method not supported */

	if (eap->method != EAP_TYPE_TTLS && eap->method != EAP_TYPE_PEAP) {
		/* Only tunneled methods with username/password supported */
		return 0;
	}

	if (eap->method == EAP_TYPE_PEAP &&
	    eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
		return 0;

	if (eap->method == EAP_TYPE_TTLS) {
		if (eap->inner_method == 0 && eap->inner_non_eap == 0)
			return 0;
		if (eap->inner_method &&
		    eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
			return 0;
		if (eap->inner_non_eap &&
		    eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_PAP &&
		    eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_CHAP &&
		    eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAP &&
		    eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAPV2)
			return 0;
	}

	if (eap->inner_method &&
	    eap->inner_method != EAP_TYPE_GTC &&
	    eap->inner_method != EAP_TYPE_MSCHAPV2)
		return 0;

	return 1;
}


static struct nai_realm_eap * nai_realm_find_eap(struct wpa_supplicant *wpa_s,
						 struct nai_realm *realm)
{
	u8 e;

	if (wpa_s->conf->home_username == NULL ||
	    wpa_s->conf->home_username[0] == '\0' ||
	    wpa_s->conf->home_password == NULL ||
	    wpa_s->conf->home_password[0] == '\0')
		return NULL;

	for (e = 0; e < realm->eap_count; e++) {
		struct nai_realm_eap *eap = &realm->eap[e];
		if (nai_realm_cred_username(eap))
			return eap;
	}

	return NULL;
}


#ifdef INTERWORKING_3GPP

static int plmn_id_match(struct wpabuf *anqp, const char *imsi)
{
	const char *sep;
	u8 plmn[3];
	const u8 *pos, *end;
	u8 udhl;

	sep = os_strchr(imsi, '-');
	if (sep == NULL || (sep - imsi != 5 && sep - imsi != 6))
		return 0;

	/* See Annex A of 3GPP TS 24.234 v8.1.0 for description */
	plmn[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
	plmn[1] = imsi[2] - '0';
	if (sep - imsi == 6)
		plmn[1] |= (imsi[5] - '0') << 4;
	else
		plmn[1] |= 0xf0;
	plmn[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);

	if (anqp == NULL)
		return 0;
	pos = wpabuf_head_u8(anqp);
	end = pos + wpabuf_len(anqp);
	if (pos + 2 > end)
		return 0;
	if (*pos != 0) {
		wpa_printf(MSG_DEBUG, "Unsupported GUD version 0x%x", *pos);
		return 0;
	}
	pos++;
	udhl = *pos++;
	if (pos + udhl > end) {
		wpa_printf(MSG_DEBUG, "Invalid UDHL");
		return 0;
	}
	end = pos + udhl;

	while (pos + 2 <= end) {
		u8 iei, len;
		const u8 *l_end;
		iei = *pos++;
		len = *pos++ & 0x7f;
		if (pos + len > end)
			break;
		l_end = pos + len;

		if (iei == 0 && len > 0) {
			/* PLMN List */
			u8 num, i;
			num = *pos++;
			for (i = 0; i < num; i++) {
				if (pos + 3 > end)
					break;
				if (os_memcmp(pos, plmn, 3) == 0)
					return 1; /* Found matching PLMN */
			}
		}

		pos = l_end;
	}

	return 0;
}


static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
{
	const char *sep, *msin;
	char nai[100], *end, *pos;
	size_t msin_len, plmn_len;

	/*
	 * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
	 * Root NAI:
	 * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
	 * <MNC> is zero-padded to three digits in case two-digit MNC is used
	 */

	if (imsi == NULL || os_strlen(imsi) > 16) {
		wpa_printf(MSG_DEBUG, "No valid IMSI available");
		return -1;
	}
	sep = os_strchr(imsi, '-');
	if (sep == NULL)
		return -1;
	plmn_len = sep - imsi;
	if (plmn_len != 5 && plmn_len != 6)
		return -1;
	msin = sep + 1;
	msin_len = os_strlen(msin);

	pos = nai;
	end = pos + sizeof(nai);
	*pos++ = prefix;
	os_memcpy(pos, imsi, plmn_len);
	pos += plmn_len;
	os_memcpy(pos, msin, msin_len);
	pos += msin_len;
	pos += os_snprintf(pos, end - pos, "@wlan.mnc");
	if (plmn_len == 5) {
		*pos++ = '0';
		*pos++ = imsi[3];
		*pos++ = imsi[4];
	} else {
		*pos++ = imsi[3];
		*pos++ = imsi[4];
		*pos++ = imsi[5];
	}
	pos += os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
			   imsi[0], imsi[1], imsi[2]);

	return wpa_config_set_quoted(ssid, "identity", nai);
}

#endif /* INTERWORKING_3GPP */


static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
				     struct wpa_bss *bss)
{
#ifdef INTERWORKING_3GPP
	struct wpa_ssid *ssid;
	const u8 *ie;

	ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
	wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " (3GPP)",
		   MAC2STR(bss->bssid));

	ssid = wpa_config_add_network(wpa_s->conf);
	if (ssid == NULL)
		return -1;

	wpas_notify_network_added(wpa_s, ssid);
	wpa_config_set_network_defaults(ssid);
	ssid->temporary = 1;
	ssid->ssid = os_zalloc(ie[1] + 1);
	if (ssid->ssid == NULL)
		goto fail;
	os_memcpy(ssid->ssid, ie + 2, ie[1]);
	ssid->ssid_len = ie[1];

	/* TODO: figure out whether to use EAP-SIM, EAP-AKA, or EAP-AKA' */
	if (wpa_config_set(ssid, "eap", "SIM", 0) < 0) {
		wpa_printf(MSG_DEBUG, "EAP-SIM not supported");
		goto fail;
	}
	if (set_root_nai(ssid, wpa_s->conf->home_imsi, '1') < 0) {
		wpa_printf(MSG_DEBUG, "Failed to set Root NAI");
		goto fail;
	}

	if (wpa_s->conf->home_milenage && wpa_s->conf->home_milenage[0]) {
		if (wpa_config_set_quoted(ssid, "password",
					  wpa_s->conf->home_milenage) < 0)
			goto fail;
	} else {
		/* TODO: PIN */
		if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
			goto fail;
	}

	if (wpa_s->conf->home_password && wpa_s->conf->home_password[0] &&
	    wpa_config_set_quoted(ssid, "password", wpa_s->conf->home_password)
	    < 0)
		goto fail;

	wpa_supplicant_select_network(wpa_s, ssid);

	return 0;

fail:
	wpas_notify_network_removed(wpa_s, ssid);
	wpa_config_remove_network(wpa_s->conf, ssid->id);
#endif /* INTERWORKING_3GPP */
	return -1;
}


int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
	struct wpa_ssid *ssid;
	struct nai_realm *realm;
	struct nai_realm_eap *eap = NULL;
	u16 count, i;
	char buf[100];
	const u8 *ie;

	if (bss == NULL)
		return -1;
	ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
	if (ie == NULL || ie[1] == 0) {
		wpa_printf(MSG_DEBUG, "Interworking: No SSID known for "
			   MACSTR, MAC2STR(bss->bssid));
		return -1;
	}

	realm = nai_realm_parse(bss->anqp_nai_realm, &count);
	if (realm == NULL) {
		wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
			   "Realm list from " MACSTR, MAC2STR(bss->bssid));
		count = 0;
	}

	for (i = 0; i < count; i++) {
		if (!nai_realm_match(&realm[i], wpa_s->conf->home_realm))
			continue;
		eap = nai_realm_find_eap(wpa_s, &realm[i]);
		if (eap)
			break;
	}

	if (!eap) {
		if (interworking_connect_3gpp(wpa_s, bss) == 0) {
			if (realm)
				nai_realm_free(realm, count);
			return 0;
		}

		wpa_printf(MSG_DEBUG, "Interworking: No matching credentials "
			   "and EAP method found for " MACSTR,
			   MAC2STR(bss->bssid));
		nai_realm_free(realm, count);
		return -1;
	}

	wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR,
		   MAC2STR(bss->bssid));

	ssid = wpa_config_add_network(wpa_s->conf);
	if (ssid == NULL) {
		nai_realm_free(realm, count);
		return -1;
	}
	wpas_notify_network_added(wpa_s, ssid);
	wpa_config_set_network_defaults(ssid);
	ssid->temporary = 1;
	ssid->ssid = os_zalloc(ie[1] + 1);
	if (ssid->ssid == NULL)
		goto fail;
	os_memcpy(ssid->ssid, ie + 2, ie[1]);
	ssid->ssid_len = ie[1];

	if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
						     eap->method), 0) < 0)
		goto fail;

	if (wpa_s->conf->home_username && wpa_s->conf->home_username[0] &&
	    wpa_config_set_quoted(ssid, "identity",
				  wpa_s->conf->home_username) < 0)
		goto fail;

	if (wpa_s->conf->home_password && wpa_s->conf->home_password[0] &&
	    wpa_config_set_quoted(ssid, "password", wpa_s->conf->home_password)
	    < 0)
		goto fail;

	switch (eap->method) {
	case EAP_TYPE_TTLS:
		if (eap->inner_method) {
			os_snprintf(buf, sizeof(buf), "\"autheap=%s\"",
				    eap_get_name(EAP_VENDOR_IETF,
						 eap->inner_method));
			if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
				goto fail;
			break;
		}
		switch (eap->inner_non_eap) {
		case NAI_REALM_INNER_NON_EAP_PAP:
			if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
			    0)
				goto fail;
			break;
		case NAI_REALM_INNER_NON_EAP_CHAP:
			if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
			    < 0)
				goto fail;
			break;
		case NAI_REALM_INNER_NON_EAP_MSCHAP:
			if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
			    < 0)
				goto fail;
			break;
		case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
			if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
					   0) < 0)
				goto fail;
			break;
		}
		break;
	case EAP_TYPE_PEAP:
		os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
			    eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
		if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
			goto fail;
		break;
	}

	if (wpa_s->conf->home_ca_cert && wpa_s->conf->home_ca_cert[0] &&
	    wpa_config_set_quoted(ssid, "ca_cert", wpa_s->conf->home_ca_cert) <
	    0)
		goto fail;

	nai_realm_free(realm, count);

	wpa_supplicant_select_network(wpa_s, ssid);

	return 0;

fail:
	wpas_notify_network_removed(wpa_s, ssid);
	wpa_config_remove_network(wpa_s->conf, ssid->id);
	nai_realm_free(realm, count);
	return -1;
}


static int interworking_credentials_available_3gpp(
	struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
	int ret = 0;

#ifdef INTERWORKING_3GPP
	if (bss->anqp_3gpp == NULL)
		return ret;

	if (wpa_s->conf->home_imsi == NULL || !wpa_s->conf->home_imsi[0] ||
	    wpa_s->conf->home_milenage == NULL ||
	    !wpa_s->conf->home_milenage[0])
		return ret;

	wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from " MACSTR,
		   MAC2STR(bss->bssid));
	ret = plmn_id_match(bss->anqp_3gpp, wpa_s->conf->home_imsi);
	wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
#endif /* INTERWORKING_3GPP */
	return ret;
}


static int interworking_credentials_available_realm(
	struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
	struct nai_realm *realm;
	u16 count, i;
	int found = 0;

	if (bss->anqp_nai_realm == NULL)
		return 0;

	if (wpa_s->conf->home_realm == NULL)
		return 0;

	wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
		   MACSTR, MAC2STR(bss->bssid));
	realm = nai_realm_parse(bss->anqp_nai_realm, &count);
	if (realm == NULL) {
		wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
			   "Realm list from " MACSTR, MAC2STR(bss->bssid));
		return 0;
	}

	for (i = 0; i < count; i++) {
		if (!nai_realm_match(&realm[i], wpa_s->conf->home_realm))
			continue;
		if (nai_realm_find_eap(wpa_s, &realm[i])) {
			found++;
			break;
		}
	}

	nai_realm_free(realm, count);

	return found;
}


static int interworking_credentials_available(struct wpa_supplicant *wpa_s,
					      struct wpa_bss *bss)
{
	return interworking_credentials_available_realm(wpa_s, bss) ||
		interworking_credentials_available_3gpp(wpa_s, bss);
}


static void interworking_select_network(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss, *selected = NULL;
	unsigned int count = 0;

	wpa_s->network_select = 0;

	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (!interworking_credentials_available(wpa_s, bss))
			continue;
		count++;
		wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR,
			MAC2STR(bss->bssid));
		if (selected == NULL && wpa_s->auto_select)
			selected = bss;
	}

	if (count == 0) {
		wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
			"with matching credentials found");
	}

	if (selected)
		interworking_connect(wpa_s, selected);
}


static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss;
	int found = 0;
	const u8 *ie;

	if (!wpa_s->fetch_anqp_in_progress)
		return;

	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (!(bss->caps & IEEE80211_CAP_ESS))
			continue;
		ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
		if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
			continue; /* AP does not support Interworking */

		if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
			found++;
			bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
			wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
				MACSTR, MAC2STR(bss->bssid));
			interworking_anqp_send_req(wpa_s, bss);
			break;
		}
	}

	if (found == 0) {
		wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
		wpa_s->fetch_anqp_in_progress = 0;
		if (wpa_s->network_select)
			interworking_select_network(wpa_s);
	}
}


static void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss;

	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
		bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;

	wpa_s->fetch_anqp_in_progress = 1;
	interworking_next_anqp_fetch(wpa_s);
}


int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
{
	if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
		return 0;

	wpa_s->network_select = 0;

	interworking_start_fetch_anqp(wpa_s);

	return 0;
}


void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
{
	if (!wpa_s->fetch_anqp_in_progress)
		return;

	wpa_s->fetch_anqp_in_progress = 0;
}


int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
		  u16 info_ids[], size_t num_ids)
{
	struct wpabuf *buf;
	int ret = 0;
	int freq;
	struct wpa_bss *bss;
	int res;

	freq = wpa_s->assoc_freq;
	bss = wpa_bss_get_bssid(wpa_s, dst);
	if (bss)
		freq = bss->freq;
	if (freq <= 0)
		return -1;

	wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
		   MAC2STR(dst), (unsigned int) num_ids);

	buf = anqp_build_req(info_ids, num_ids, NULL);
	if (buf == NULL)
		return -1;

	res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
	if (res < 0) {
		wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
		ret = -1;
	} else
		wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
			   "%u", res);

	wpabuf_free(buf);
	return ret;
}


static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
					    const u8 *sa, u16 info_id,
					    const u8 *data, size_t slen)
{
	const u8 *pos = data;
	struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);

	switch (info_id) {
	case ANQP_CAPABILITY_LIST:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" ANQP Capability list", MAC2STR(sa));
		break;
	case ANQP_VENUE_NAME:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" Venue Name", MAC2STR(sa));
		wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_venue_name);
			bss->anqp_venue_name = wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_NETWORK_AUTH_TYPE:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" Network Authentication Type information",
			MAC2STR(sa));
		wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
				  "Type", pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_network_auth_type);
			bss->anqp_network_auth_type =
				wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_ROAMING_CONSORTIUM:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" Roaming Consortium list", MAC2STR(sa));
		wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
				  pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_roaming_consortium);
			bss->anqp_roaming_consortium =
				wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_IP_ADDR_TYPE_AVAILABILITY:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" IP Address Type Availability information",
			MAC2STR(sa));
		wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
			    pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_ip_addr_type_availability);
			bss->anqp_ip_addr_type_availability =
				wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_NAI_REALM:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" NAI Realm list", MAC2STR(sa));
		wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_nai_realm);
			bss->anqp_nai_realm = wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_3GPP_CELLULAR_NETWORK:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" 3GPP Cellular Network information", MAC2STR(sa));
		wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
				  pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_3gpp);
			bss->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_DOMAIN_NAME:
		wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
			" Domain Name list", MAC2STR(sa));
		wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
		if (bss) {
			wpabuf_free(bss->anqp_domain_name);
			bss->anqp_domain_name = wpabuf_alloc_copy(pos, slen);
		}
		break;
	case ANQP_VENDOR_SPECIFIC:
		if (slen < 3)
			return;

		switch (WPA_GET_BE24(pos)) {
		default:
			wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
				   "vendor-specific ANQP OUI %06x",
				   WPA_GET_BE24(pos));
			return;
		}
		break;
	default:
		wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
			   "%u", info_id);
		break;
	}
}


void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
		  enum gas_query_result result,
		  const struct wpabuf *adv_proto,
		  const struct wpabuf *resp, u16 status_code)
{
	struct wpa_supplicant *wpa_s = ctx;
	const u8 *pos;
	const u8 *end;
	u16 info_id;
	u16 slen;

	if (result != GAS_QUERY_SUCCESS)
		return;

	pos = wpabuf_head(adv_proto);
	if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
	    pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
		wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
			   "Protocol in response");
		return;
	}

	pos = wpabuf_head(resp);
	end = pos + wpabuf_len(resp);

	while (pos < end) {
		if (pos + 4 > end) {
			wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
			break;
		}
		info_id = WPA_GET_LE16(pos);
		pos += 2;
		slen = WPA_GET_LE16(pos);
		pos += 2;
		if (pos + slen > end) {
			wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
				   "for Info ID %u", info_id);
			break;
		}
		interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
						slen);
		pos += slen;
	}
}


static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
					  struct wpa_scan_results *scan_res)
{
	wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
		   "ANQP fetch");
	interworking_start_fetch_anqp(wpa_s);
}


int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
{
	interworking_stop_fetch_anqp(wpa_s);
	wpa_s->network_select = 1;
	wpa_s->auto_select = !!auto_select;
	wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
		   "selection");
	wpa_s->scan_res_handler = interworking_scan_res_handler;
	wpa_s->scan_req = 2;
	wpa_supplicant_req_scan(wpa_s, 0, 0);

	return 0;
}