HS 2.0: OSU Provider NAI List advertisement

Extend hostapd to allow the new OSU Provider NAI List ANQP-element to be
advertised in addition to the previously used OSU Providers list
ANQP-element. The new osu_nai2 configurator parameter option is used to
specify the OSU_NAI value for the shared BSS (Single SSID) case while
osu_nai remains to be used for the separate OSU BSS.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

hostapd/config_file.c

@@ -2049,6 +2049,24 @@ static int hs20_parse_osu_nai(struct hostapd_bss_config *bss,
 }
 
 
+static int hs20_parse_osu_nai2(struct hostapd_bss_config *bss,
+			       char *pos, int line)
+{
+	if (bss->last_osu == NULL) {
+		wpa_printf(MSG_ERROR, "Line %d: Unexpected OSU field", line);
+		return -1;
+	}
+
+	os_free(bss->last_osu->osu_nai2);
+	bss->last_osu->osu_nai2 = os_strdup(pos);
+	if (bss->last_osu->osu_nai2 == NULL)
+		return -1;
+	bss->hs20_osu_providers_nai_count++;
+
+	return 0;
+}
+
+
 static int hs20_parse_osu_method_list(struct hostapd_bss_config *bss, char *pos,
 				      int line)
 {
@@ -3761,6 +3779,9 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 	} else if (os_strcmp(buf, "osu_nai") == 0) {
 		if (hs20_parse_osu_nai(bss, pos, line) < 0)
 			return 1;
+	} else if (os_strcmp(buf, "osu_nai2") == 0) {
+		if (hs20_parse_osu_nai2(bss, pos, line) < 0)
+			return 1;
 	} else if (os_strcmp(buf, "osu_method_list") == 0) {
 		if (hs20_parse_osu_method_list(bss, pos, line) < 0)
 			return 1;

hostapd/hostapd.conf

@@ -2227,12 +2227,15 @@ own_ip_addr=127.0.0.1
 # OSU Providers
 # One or more sets of following parameter. Each OSU provider is started by the
 # mandatory osu_server_uri item. The other parameters add information for the
-# last added OSU provider.
+# last added OSU provider. osu_nai specifies the OSU_NAI value for OSEN
+# authentication when using a standalone OSU BSS. osu_nai2 specifies the OSU_NAI
+# value for OSEN authentication when using a shared BSS (Single SSID) for OSU.
 #
 #osu_server_uri=https://example.com/osu/
 #osu_friendly_name=eng:Example operator
 #osu_friendly_name=fin:Esimerkkipalveluntarjoaja
 #osu_nai=anonymous@example.com
+#osu_nai2=anonymous@example.com
 #osu_method_list=1 0
 #osu_icon=icon32
 #osu_icon=icon64

src/ap/ap_config.c

@@ -631,6 +631,7 @@ void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 				os_free(p->icons[j]);
 			os_free(p->icons);
 			os_free(p->osu_nai);
+			os_free(p->osu_nai2);
 			os_free(p->service_desc);
 		}
 		os_free(conf->hs20_osu_providers);

src/ap/ap_config.h

@@ -585,10 +585,12 @@ struct hostapd_bss_config {
 		char **icons;
 		size_t icons_count;
 		char *osu_nai;
+		char *osu_nai2;
 		unsigned int service_desc_count;
 		struct hostapd_lang_string *service_desc;
 	} *hs20_osu_providers, *last_osu;
 	size_t hs20_osu_providers_count;
+	size_t hs20_osu_providers_nai_count;
 	char **hs20_operator_icon;
 	size_t hs20_operator_icon_count;
 	unsigned int hs20_deauth_req_timeout;

src/ap/gas_serv.c

@@ -181,6 +181,8 @@ static void anqp_add_hs_capab_list(struct hostapd_data *hapd,
 		wpabuf_put_u8(buf, HS20_STYPE_OPERATING_CLASS);
 	if (hapd->conf->hs20_osu_providers_count)
 		wpabuf_put_u8(buf, HS20_STYPE_OSU_PROVIDERS_LIST);
+	if (hapd->conf->hs20_osu_providers_nai_count)
+		wpabuf_put_u8(buf, HS20_STYPE_OSU_PROVIDERS_NAI_LIST);
 	if (hapd->conf->hs20_icons_count)
 		wpabuf_put_u8(buf, HS20_STYPE_ICON_REQUEST);
 	if (hapd->conf->hs20_operator_icon_count)
@@ -817,6 +819,40 @@ static void anqp_add_osu_providers_list(struct hostapd_data *hapd,
 }
 
 
+static void anqp_add_osu_provider_nai(struct wpabuf *buf,
+				      struct hs20_osu_provider *p)
+{
+	/* OSU_NAI for shared BSS (Single SSID) */
+	if (p->osu_nai2) {
+		wpabuf_put_u8(buf, os_strlen(p->osu_nai2));
+		wpabuf_put_str(buf, p->osu_nai2);
+	} else {
+		wpabuf_put_u8(buf, 0);
+	}
+}
+
+
+static void anqp_add_osu_providers_nai_list(struct hostapd_data *hapd,
+					    struct wpabuf *buf)
+{
+	if (hapd->conf->hs20_osu_providers_nai_count) {
+		size_t i;
+		u8 *len = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
+		wpabuf_put_be24(buf, OUI_WFA);
+		wpabuf_put_u8(buf, HS20_ANQP_OUI_TYPE);
+		wpabuf_put_u8(buf, HS20_STYPE_OSU_PROVIDERS_NAI_LIST);
+		wpabuf_put_u8(buf, 0); /* Reserved */
+
+		for (i = 0; i < hapd->conf->hs20_osu_providers_count; i++) {
+			anqp_add_osu_provider_nai(
+				buf, &hapd->conf->hs20_osu_providers[i]);
+		}
+
+		gas_anqp_set_element_len(buf, len);
+	}
+}
+
+
 static void anqp_add_icon_binary_file(struct hostapd_data *hapd,
 				      struct wpabuf *buf,
 				      const u8 *name, size_t name_len)
@@ -1024,6 +1060,8 @@ gas_serv_build_gas_resp_payload(struct hostapd_data *hapd,
 		anqp_add_icon_binary_file(hapd, buf, icon_name, icon_name_len);
 	if (request & ANQP_REQ_OPERATOR_ICON_METADATA)
 		anqp_add_operator_icon_metadata(hapd, buf);
+	if (request & ANQP_REQ_OSU_PROVIDERS_NAI_LIST)
+		anqp_add_osu_providers_nai_list(hapd, buf);
 #endif /* CONFIG_HS20 */
 
 #ifdef CONFIG_MBO
@@ -1216,6 +1254,11 @@ static void rx_anqp_hs_query_list(struct hostapd_data *hapd, u8 subtype,
 			     "Operator Icon Metadata",
 			     hapd->conf->hs20_operator_icon_count, qi);
 		break;
+	case HS20_STYPE_OSU_PROVIDERS_NAI_LIST:
+		set_anqp_req(ANQP_REQ_OSU_PROVIDERS_NAI_LIST,
+			     "OSU Providers NAI List",
+			     hapd->conf->hs20_osu_providers_nai_count, qi);
+		break;
 	default:
 		wpa_printf(MSG_DEBUG, "ANQP: Unsupported HS 2.0 subtype %u",
 			   subtype);

src/ap/gas_serv.h

@@ -62,6 +62,8 @@
 	(0x10000 << HS20_STYPE_ICON_REQUEST)
 #define ANQP_REQ_OPERATOR_ICON_METADATA \
 	(0x10000 << HS20_STYPE_OPERATOR_ICON_METADATA)
+#define ANQP_REQ_OSU_PROVIDERS_NAI_LIST \
+	(0x10000 << HS20_STYPE_OSU_PROVIDERS_NAI_LIST)
 /* The first MBO ANQP-element can be included in the optimized bitmap. */
 #define ANQP_REQ_MBO_CELL_DATA_CONN_PREF \
 	(BIT(29) << MBO_ANQP_SUBTYPE_CELL_CONN_PREF)

src/common/ieee802_11_defs.h

@@ -1331,6 +1331,7 @@ enum wmm_ac {
 #define HS20_STYPE_ICON_REQUEST 10
 #define HS20_STYPE_ICON_BINARY_FILE 11
 #define HS20_STYPE_OPERATOR_ICON_METADATA 12
+#define HS20_STYPE_OSU_PROVIDERS_NAI_LIST 13
 
 #define HS20_DGAF_DISABLED 0x01
 #define HS20_PPS_MO_ID_PRESENT 0x02