RADIUS DAS: Support Acct-Multi-Session-Id as a session identifier

This extends Disconnect-Request support for an additiona session
identification attribute.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/hostapd.c

@@ -15,6 +15,8 @@
 #include "radius/radius_client.h"
 #include "radius/radius_das.h"
 #include "eap_server/tncs.h"
+#include "eapol_auth/eapol_auth_sm.h"
+#include "eapol_auth/eapol_auth_sm_i.h"
 #include "hostapd.h"
 #include "authsrv.h"
 #include "sta_info.h"
@@ -673,6 +675,42 @@ static struct sta_info * hostapd_das_find_sta(struct hostapd_data *hapd,
 		wpa_printf(MSG_DEBUG, "RADIUS DAS: Acct-Session-Id match");
 	}
 
+	if (attr->acct_multi_session_id) {
+		num_attr++;
+		if (attr->acct_multi_session_id_len != 17) {
+			wpa_printf(MSG_DEBUG,
+				   "RADIUS DAS: Acct-Multi-Session-Id cannot match");
+			return NULL;
+		}
+		count = 0;
+
+		for (sta = hapd->sta_list; sta; sta = sta->next) {
+			if (!sta->radius_das_match)
+				continue;
+			if (!sta->eapol_sm ||
+			    !sta->eapol_sm->acct_multi_session_id_hi) {
+				sta->radius_das_match = 0;
+				continue;
+			}
+			os_snprintf(buf, sizeof(buf), "%08X+%08X",
+				    sta->eapol_sm->acct_multi_session_id_hi,
+				    sta->eapol_sm->acct_multi_session_id_lo);
+			if (os_memcmp(attr->acct_multi_session_id, buf, 17) !=
+			    0)
+				sta->radius_das_match = 0;
+			else
+				count++;
+		}
+
+		if (count == 0) {
+			wpa_printf(MSG_DEBUG,
+				   "RADIUS DAS: No matches remaining after Acct-Multi-Session-Id check");
+			return NULL;
+		}
+		wpa_printf(MSG_DEBUG,
+			   "RADIUS DAS: Acct-Multi-Session-Id match");
+	}
+
 	if (attr->cui) {
 		num_attr++;
 		count = 0;

src/radius/radius_das.c

@@ -42,6 +42,7 @@ static struct radius_msg * radius_das_disconnect(struct radius_das_data *das,
 		RADIUS_ATTR_CALLING_STATION_ID,
 		RADIUS_ATTR_NAS_IDENTIFIER,
 		RADIUS_ATTR_ACCT_SESSION_ID,
+		RADIUS_ATTR_ACCT_MULTI_SESSION_ID,
 		RADIUS_ATTR_EVENT_TIMESTAMP,
 		RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
 		RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
@@ -129,6 +130,12 @@ static struct radius_msg * radius_das_disconnect(struct radius_das_data *das,
 		attrs.acct_session_id_len = len;
 	}
 
+	if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_ACCT_MULTI_SESSION_ID,
+				    &buf, &len, NULL) == 0) {
+		attrs.acct_multi_session_id = buf;
+		attrs.acct_multi_session_id_len = len;
+	}
+
 	if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
 				    &buf, &len, NULL) == 0) {
 		attrs.cui = buf;

src/radius/radius_das.h

@@ -31,6 +31,8 @@ struct radius_das_attrs {
 	size_t user_name_len;
 	const u8 *acct_session_id;
 	size_t acct_session_id_len;
+	const u8 *acct_multi_session_id;
+	size_t acct_multi_session_id_len;
 	const u8 *cui;
 	size_t cui_len;
 };