radius_server.c

最新的Host AP 新添加了许多pcmcia 的驱动

	struct eap_hdr eapfail;

	RADIUS_DEBUG("Reject invalid request from %s:%d",
		     from_addr, from_port);

	msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
			     request->hdr->identifier);
	if (msg == NULL) {
		return -1;
	}

	os_memset(&eapfail, 0, sizeof(eapfail));
	eapfail.code = EAP_CODE_FAILURE;
	eapfail.identifier = 0;
	eapfail.length = host_to_be16(sizeof(eapfail));

	if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
		RADIUS_DEBUG("Failed to add EAP-Message attribute");
	}

	if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
		RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
		radius_msg_free(msg);
		os_free(msg);
		return -1;
	}

	if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
				  client->shared_secret_len,
				  request->hdr->authenticator) < 0) {
		RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
	}

	if (wpa_debug_level <= MSG_MSGDUMP) {
		radius_msg_dump(msg);
	}

	data->counters.access_rejects++;
	client->counters.access_rejects++;
	if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
		   (struct sockaddr *) from, sizeof(*from)) < 0) {
		perror("sendto[RADIUS SRV]");
		ret = -1;
	}

	radius_msg_free(msg);
	os_free(msg);

	return ret;
}


static int radius_server_request(struct radius_server_data *data,
				 struct radius_msg *msg,
				 struct sockaddr *from, socklen_t fromlen,
				 struct radius_client *client,
				 const char *from_addr, int from_port,
				 struct radius_session *force_sess)
{
	u8 *eap = NULL;
	size_t eap_len;
	int res, state_included = 0;
	u8 statebuf[4];
	unsigned int state;
	struct radius_session *sess;
	struct radius_msg *reply;

	if (force_sess)
		sess = force_sess;
	else {
		res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
					  sizeof(statebuf));
		state_included = res >= 0;
		if (res == sizeof(statebuf)) {
			state = WPA_GET_BE32(statebuf);
			sess = radius_server_get_session(client, state);
		} else {
			sess = NULL;
		}
	}

	if (sess) {
		RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
	} else if (state_included) {
		RADIUS_DEBUG("State attribute included but no session found");
		radius_server_reject(data, client, msg, from, fromlen,
				     from_addr, from_port);
		return -1;
	} else {
		sess = radius_server_get_new_session(data, client, msg);
		if (sess == NULL) {
			RADIUS_DEBUG("Could not create a new session");
			radius_server_reject(data, client, msg, from, fromlen,
					     from_addr, from_port);
			return -1;
		}
	}

	if (sess->last_from_port == from_port &&
	    sess->last_identifier == msg->hdr->identifier &&
	    os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
	    0) {
		RADIUS_DEBUG("Duplicate message from %s", from_addr);
		data->counters.dup_access_requests++;
		client->counters.dup_access_requests++;

		if (sess->last_reply) {
			res = sendto(data->auth_sock, sess->last_reply->buf,
				     sess->last_reply->buf_used, 0,
				     (struct sockaddr *) from, fromlen);
			if (res < 0) {
				perror("sendto[RADIUS SRV]");
			}
			return 0;
		}

		RADIUS_DEBUG("No previous reply available for duplicate "
			     "message");
		return -1;
	}
		      
	eap = radius_msg_get_eap(msg, &eap_len);
	if (eap == NULL) {
		RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
			     from_addr);
		data->counters.packets_dropped++;
		client->counters.packets_dropped++;
		return -1;
	}

	RADIUS_DUMP("Received EAP data", eap, eap_len);

	/* FIX: if Code is Request, Success, or Failure, send Access-Reject;
	 * RFC3579 Sect. 2.6.2.
	 * Include EAP-Response/Nak with no preferred method if
	 * code == request.
	 * If code is not 1-4, discard the packet silently.
	 * Or is this already done by the EAP state machine? */

	wpabuf_free(sess->eap_if->eapRespData);
	sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
	if (sess->eap_if->eapRespData == NULL)
		os_free(eap);
	eap = NULL;
	sess->eap_if->eapResp = TRUE;
	eap_server_sm_step(sess->eap);

	if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
	     sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
		RADIUS_DUMP("EAP data from the state machine",
			    wpabuf_head(sess->eap_if->eapReqData),
			    wpabuf_len(sess->eap_if->eapReqData));
	} else if (sess->eap_if->eapFail) {
		RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
			     "set");
	} else if (eap_sm_method_pending(sess->eap)) {
		if (sess->last_msg) {
			radius_msg_free(sess->last_msg);
			os_free(sess->last_msg);
		}
		sess->last_msg = msg;
		sess->last_from_port = from_port;
		os_free(sess->last_from_addr);
		sess->last_from_addr = os_strdup(from_addr);
		sess->last_fromlen = fromlen;
		os_memcpy(&sess->last_from, from, fromlen);
		return -2;
	} else {
		RADIUS_DEBUG("No EAP data from the state machine - ignore this"
			     " Access-Request silently (assuming it was a "
			     "duplicate)");
		data->counters.packets_dropped++;
		client->counters.packets_dropped++;
		return -1;
	}

	reply = radius_server_encapsulate_eap(data, client, sess, msg);

	if (reply) {
		RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
		if (wpa_debug_level <= MSG_MSGDUMP) {
			radius_msg_dump(reply);
		}

		switch (reply->hdr->code) {
		case RADIUS_CODE_ACCESS_ACCEPT:
			data->counters.access_accepts++;
			client->counters.access_accepts++;
			break;
		case RADIUS_CODE_ACCESS_REJECT:
			data->counters.access_rejects++;
			client->counters.access_rejects++;
			break;
		case RADIUS_CODE_ACCESS_CHALLENGE:
			data->counters.access_challenges++;
			client->counters.access_challenges++;
			break;
		}
		res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
			     (struct sockaddr *) from, fromlen);
		if (res < 0) {
			perror("sendto[RADIUS SRV]");
		}
		if (sess->last_reply) {
			radius_msg_free(sess->last_reply);
			os_free(sess->last_reply);
		}
		sess->last_reply = reply;
		sess->last_from_port = from_port;
		sess->last_identifier = msg->hdr->identifier;
		os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
			  16);
	} else {
		data->counters.packets_dropped++;
		client->counters.packets_dropped++;
	}

	if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) {
		RADIUS_DEBUG("Removing completed session 0x%x after timeout",
			     sess->sess_id);
		eloop_cancel_timeout(radius_server_session_remove_timeout,
				     data, sess);
		eloop_register_timeout(10, 0,
				       radius_server_session_remove_timeout,
				       data, sess);
	}

	return 0;
}


static void radius_server_receive_auth(int sock, void *eloop_ctx,
				       void *sock_ctx)
{
	struct radius_server_data *data = eloop_ctx;
	u8 *buf = NULL;
	struct sockaddr_storage from;
	socklen_t fromlen;
	int len;
	struct radius_client *client = NULL;
	struct radius_msg *msg = NULL;
	char abuf[50];
	int from_port = 0;

	buf = os_malloc(RADIUS_MAX_MSG_LEN);
	if (buf == NULL) {
		goto fail;
	}

	fromlen = sizeof(from);
	len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
		       (struct sockaddr *) &from, &fromlen);
	if (len < 0) {
		perror("recvfrom[radius_server]");
		goto fail;
	}

#ifdef CONFIG_IPV6
	if (data->ipv6) {
		struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
		if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
		    == NULL)
			abuf[0] = '\0';
		from_port = ntohs(from6->sin6_port);
		RADIUS_DEBUG("Received %d bytes from %s:%d",
			     len, abuf, from_port);

		client = radius_server_get_client(data,
						  (struct in_addr *)
						  &from6->sin6_addr, 1);
	}
#endif /* CONFIG_IPV6 */

	if (!data->ipv6) {
		struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
		os_strlcpy(abuf, inet_ntoa(from4->sin_addr), sizeof(abuf));
		from_port = ntohs(from4->sin_port);
		RADIUS_DEBUG("Received %d bytes from %s:%d",
			     len, abuf, from_port);

		client = radius_server_get_client(data, &from4->sin_addr, 0);
	}

	RADIUS_DUMP("Received data", buf, len);

	if (client == NULL) {
		RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
		data->counters.invalid_requests++;
		goto fail;
	}

	msg = radius_msg_parse(buf, len);
	if (msg == NULL) {
		RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
		data->counters.malformed_access_requests++;
		client->counters.malformed_access_requests++;
		goto fail;
	}

	os_free(buf);
	buf = NULL;

	if (wpa_debug_level <= MSG_MSGDUMP) {
		radius_msg_dump(msg);
	}

	if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
		RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
		data->counters.unknown_types++;
		client->counters.unknown_types++;
		goto fail;
	}

	data->counters.access_requests++;
	client->counters.access_requests++;

	if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
				       client->shared_secret_len, NULL)) {
		RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
		data->counters.bad_authenticators++;
		client->counters.bad_authenticators++;
		goto fail;
	}

	if (radius_server_request(data, msg, (struct sockaddr *) &from,
				  fromlen, client, abuf, from_port, NULL) ==
	    -2)
		return; /* msg was stored with the session */

fail:
	if (msg) {
		radius_msg_free(msg);
		os_free(msg);
	}
	os_free(buf);
}


static int radius_server_open_socket(int port)
{
	int s;
	struct sockaddr_in addr;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		perror("socket");
		return -1;
	}

	os_memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		perror("bind");
		close(s);
		return -1;
	}

	return s;
}


#ifdef CONFIG_IPV6
static int radius_server_open_socket6(int port)
{
	int s;
	struct sockaddr_in6 addr;

	s = socket(PF_INET6, SOCK_DGRAM, 0);
	if (s < 0) {
		perror("socket[IPv6]");
		return -1;
	}

	os_memset(&addr, 0, sizeof(addr));
	addr.sin6_family = AF_INET6;
	os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
	addr.sin6_port = htons(port);
	if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		perror("bind");
		close(s);
		return -1;
	}

	return s;
}
#endif /* CONFIG_IPV6 */


static void radius_server_free_sessions(struct radius_server_data *data,
					struct radius_session *sessions)
{
	struct radius_session *session, *prev;

	session = sessions;
	while (session) {
		prev = session;
		session = session->next;
		radius_server_session_free(data, prev);
	}
}


static void radius_server_free_clients(struct radius_server_data *data,
				       struct radius_client *clients)
{
	struct radius_client *client, *prev;

	client = clients;
	while (client) {
		prev = client;
		client = client->next;

		radius_server_free_sessions(data, prev->sessions);
		os_free(prev->shared_secret);
		os_free(prev);
	}
}


static struct radius_client *
radius_server_read_clients(const char *client_file, int ipv6)
{
	FILE *f;
	const int buf_size = 1024;
	char *buf, *pos;
	struct radius_client *clients, *tail, *entry;
	int line = 0, mask, failed = 0, i;
	struct in_addr addr;