1 files changed, 447 insertions, 0 deletions

diff --git a/contrib/hostapd/ieee802_11_auth.c b/contrib/hostapd/ieee802_11_auth.c
new file mode 100644
index 0000000000000..8dbcee188dfd2
--- /dev/null
+++ b/contrib/hostapd/ieee802_11_auth.c
@@ -0,0 +1,447 @@
+/*
+ * Host AP (software wireless LAN access point) user space daemon for
+ * Host AP kernel driver / IEEE 802.11 authentication (ACL)
+ * Copyright (c) 2003-2005, Jouni Malinen <jkmaline@cc.hut.fi>
+ *
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include "hostapd.h"
+#include "ieee802_11.h"
+#include "ieee802_11_auth.h"
+#include "radius.h"
+#include "radius_client.h"
+#include "eloop.h"
+
+#define RADIUS_ACL_TIMEOUT 30
+
+
+struct hostapd_cached_radius_acl {
+	time_t timestamp;
+	macaddr addr;
+	int accepted; /* HOSTAPD_ACL_* */
+	struct hostapd_cached_radius_acl *next;
+	u32 session_timeout;
+	u32 acct_interim_interval;
+};
+
+
+struct hostapd_acl_query_data {
+	time_t timestamp;
+	u8 radius_id;
+	macaddr addr;
+	u8 *auth_msg; /* IEEE 802.11 authentication frame from station */
+	size_t auth_msg_len;
+	struct hostapd_acl_query_data *next;
+};
+
+
+static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache)
+{
+	struct hostapd_cached_radius_acl *prev;
+
+	while (acl_cache) {
+		prev = acl_cache;
+		acl_cache = acl_cache->next;
+		free(prev);
+	}
+}
+
+
+static int hostapd_acl_cache_get(struct hostapd_data *hapd, u8 *addr,
+				 u32 *session_timeout,
+				 u32 *acct_interim_interval)
+{
+	struct hostapd_cached_radius_acl *entry;
+	time_t now;
+
+	time(&now);
+	entry = hapd->acl_cache;
+
+	while (entry) {
+		if (memcmp(entry->addr, addr, ETH_ALEN) == 0) {
+			if (now - entry->timestamp > RADIUS_ACL_TIMEOUT)
+				return -1; /* entry has expired */
+			if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT)
+				*session_timeout = entry->session_timeout;
+			*acct_interim_interval = entry->acct_interim_interval;
+			return entry->accepted;
+		}
+
+		entry = entry->next;
+	}
+
+	return -1;
+}
+
+
+static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
+{
+	if (query == NULL)
+		return;
+	free(query->auth_msg);
+	free(query);
+}
+
+
+static int hostapd_radius_acl_query(hostapd *hapd, u8 *addr,
+				    struct hostapd_acl_query_data *query)
+{
+	struct radius_msg *msg;
+	char buf[128];
+
+	query->radius_id = radius_client_get_id(hapd->radius);
+	msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id);
+	if (msg == NULL)
+		return -1;
+
+	radius_msg_make_authenticator(msg, addr, ETH_ALEN);
+
+	snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
+	if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
+				 strlen(buf))) {
+		printf("Could not add User-Name\n");
+		goto fail;
+	}
+
+	if (!radius_msg_add_attr_user_password(
+		    msg, (u8 *) buf, strlen(buf),
+		    hapd->conf->auth_server->shared_secret,
+		    hapd->conf->auth_server->shared_secret_len)) {
+		printf("Could not add User-Password\n");
+		goto fail;
+	}
+
+	if (!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
+				 (u8 *) &hapd->conf->own_ip_addr, 4)) {
+		printf("Could not add NAS-IP-Address\n");
+		goto fail;
+	}
+
+	if (hapd->conf->nas_identifier &&
+	    !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
+				 (u8 *) hapd->conf->nas_identifier,
+				 strlen(hapd->conf->nas_identifier))) {
+		printf("Could not add NAS-Identifier\n");
+		goto fail;
+	}
+
+	snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
+		 MAC2STR(hapd->own_addr), hapd->conf->ssid);
+	if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
+				 (u8 *) buf, strlen(buf))) {
+		printf("Could not add Called-Station-Id\n");
+		goto fail;
+	}
+
+	snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
+		 MAC2STR(addr));
+	if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
+				 (u8 *) buf, strlen(buf))) {
+		printf("Could not add Calling-Station-Id\n");
+		goto fail;
+	}
+
+	if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
+				       RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
+		printf("Could not add NAS-Port-Type\n");
+		goto fail;
+	}
+
+	snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
+	if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
+				 (u8 *) buf, strlen(buf))) {
+		printf("Could not add Connect-Info\n");
+		goto fail;
+	}
+
+	radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
+	return 0;
+
+ fail:
+	radius_msg_free(msg);
+	free(msg);
+	return -1;
+}
+
+
+int hostapd_allowed_address(hostapd *hapd, u8 *addr, u8 *msg, size_t len,
+			    u32 *session_timeout, u32 *acct_interim_interval)
+{
+	*session_timeout = 0;
+	*acct_interim_interval = 0;
+
+	if (hostapd_maclist_found(hapd->conf->accept_mac,
+				  hapd->conf->num_accept_mac, addr))
+		return HOSTAPD_ACL_ACCEPT;
+
+	if (hostapd_maclist_found(hapd->conf->deny_mac,
+				  hapd->conf->num_deny_mac, addr))
+		return HOSTAPD_ACL_REJECT;
+
+	if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
+		return HOSTAPD_ACL_ACCEPT;
+	if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
+		return HOSTAPD_ACL_REJECT;
+
+	if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
+		struct hostapd_acl_query_data *query;
+
+		/* Check whether ACL cache has an entry for this station */
+		int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
+						acct_interim_interval);
+		if (res == HOSTAPD_ACL_ACCEPT ||
+		    res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
+			return res;
+		if (res == HOSTAPD_ACL_REJECT)
+			return HOSTAPD_ACL_REJECT;
+
+		query = hapd->acl_queries;
+		while (query) {
+			if (memcmp(query->addr, addr, ETH_ALEN) == 0) {
+				/* pending query in RADIUS retransmit queue;
+				 * do not generate a new one */
+				return HOSTAPD_ACL_PENDING;
+			}
+			query = query->next;
+		}
+
+		if (!hapd->conf->auth_server)
+			return HOSTAPD_ACL_REJECT;
+
+		/* No entry in the cache - query external RADIUS server */
+		query = malloc(sizeof(*query));
+		if (query == NULL) {
+			printf("malloc for query data failed\n");
+			return HOSTAPD_ACL_REJECT;
+		}
+		memset(query, 0, sizeof(*query));
+		time(&query->timestamp);
+		memcpy(query->addr, addr, ETH_ALEN);
+		if (hostapd_radius_acl_query(hapd, addr, query)) {
+			printf("Failed to send Access-Request for ACL "
+			       "query.\n");
+			hostapd_acl_query_free(query);
+			return HOSTAPD_ACL_REJECT;
+		}
+
+		query->auth_msg = malloc(len);
+		if (query->auth_msg == NULL) {
+			printf("Failed to allocate memory for auth frame.\n");
+			hostapd_acl_query_free(query);
+			return HOSTAPD_ACL_REJECT;
+		}
+		memcpy(query->auth_msg, msg, len);
+		query->auth_msg_len = len;
+		query->next = hapd->acl_queries;
+		hapd->acl_queries = query;
+
+		/* Queued data will be processed in hostapd_acl_recv_radius()
+		 * when RADIUS server replies to the sent Access-Request. */
+		return HOSTAPD_ACL_PENDING;
+	}
+
+	return HOSTAPD_ACL_REJECT;
+}
+
+
+static void hostapd_acl_expire_cache(hostapd *hapd, time_t now)
+{
+	struct hostapd_cached_radius_acl *prev, *entry, *tmp;
+
+	prev = NULL;
+	entry = hapd->acl_cache;
+
+	while (entry) {
+		if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
+			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
+				      "Cached ACL entry for " MACSTR
+				      " has expired.\n", MAC2STR(entry->addr));
+			if (prev)
+				prev->next = entry->next;
+			else
+				hapd->acl_cache = entry->next;
+
+			tmp = entry;
+			entry = entry->next;
+			free(tmp);
+			continue;
+		}
+
+		prev = entry;
+		entry = entry->next;
+	}
+}
+
+
+static void hostapd_acl_expire_queries(hostapd *hapd, time_t now)
+{
+	struct hostapd_acl_query_data *prev, *entry, *tmp;
+
+	prev = NULL;
+	entry = hapd->acl_queries;
+
+	while (entry) {
+		if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
+			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
+				      "ACL query for " MACSTR
+				      " has expired.\n", MAC2STR(entry->addr));
+			if (prev)
+				prev->next = entry->next;
+			else
+				hapd->acl_queries = entry->next;
+
+			tmp = entry;
+			entry = entry->next;
+			hostapd_acl_query_free(tmp);
+			continue;
+		}
+
+		prev = entry;
+		entry = entry->next;
+	}
+}
+
+
+static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
+{
+	hostapd *hapd = eloop_ctx;
+	time_t now;
+
+	time(&now);
+	hostapd_acl_expire_cache(hapd, now);
+	hostapd_acl_expire_queries(hapd, now);
+
+	eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
+}
+
+
+/* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
+ * or -1 if not. */
+static RadiusRxResult
+hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
+			u8 *shared_secret, size_t shared_secret_len,
+			void *data)
+{
+	struct hostapd_data *hapd = data;
+	struct hostapd_acl_query_data *query, *prev;
+	struct hostapd_cached_radius_acl *cache;
+
+	query = hapd->acl_queries;
+	prev = NULL;
+	while (query) {
+		if (query->radius_id == msg->hdr->identifier)
+			break;
+		prev = query;
+		query = query->next;
+	}
+	if (query == NULL)
+		return RADIUS_RX_UNKNOWN;
+
+	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Found matching Access-Request "
+		      "for RADIUS message (id=%d)\n", query->radius_id);
+
+	if (radius_msg_verify_acct(msg, shared_secret, shared_secret_len,
+				   req)) {
+		printf("Incoming RADIUS packet did not have correct "
+		       "authenticator - dropped\n");
+		return RADIUS_RX_INVALID_AUTHENTICATOR;
+	}
+
+	if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
+	    msg->hdr->code != RADIUS_CODE_ACCESS_REJECT) {
+		printf("Unknown RADIUS message code %d to ACL query\n",
+		       msg->hdr->code);
+		return RADIUS_RX_UNKNOWN;
+	}
+
+	/* Insert Accept/Reject info into ACL cache */
+	cache = malloc(sizeof(*cache));
+	if (cache == NULL) {
+		printf("Failed to add ACL cache entry\n");
+		goto done;
+	}
+	memset(cache, 0, sizeof(*cache));
+	time(&cache->timestamp);
+	memcpy(cache->addr, query->addr, sizeof(cache->addr));
+	if (msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
+		if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
+					      &cache->session_timeout) == 0)
+			cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
+		else
+			cache->accepted = HOSTAPD_ACL_ACCEPT;
+
+		if (radius_msg_get_attr_int32(
+			    msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
+			    &cache->acct_interim_interval) == 0 &&
+		    cache->acct_interim_interval < 60) {
+			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Ignored too "
+				      "small Acct-Interim-Interval %d for "
+				      "STA " MACSTR "\n",
+				      cache->acct_interim_interval,
+				      MAC2STR(query->addr));
+			cache->acct_interim_interval = 0;
+		}
+	} else
+		cache->accepted = HOSTAPD_ACL_REJECT;
+	cache->next = hapd->acl_cache;
+	hapd->acl_cache = cache;
+
+	/* Re-send original authentication frame for 802.11 processing */
+	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Re-sending authentication frame "
+		      "after successful RADIUS ACL query\n");
+	ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
+			WLAN_FC_STYPE_AUTH);
+
+ done:
+	if (prev == NULL)
+		hapd->acl_queries = query->next;
+	else
+		prev->next = query->next;
+
+	hostapd_acl_query_free(query);
+
+	return RADIUS_RX_PROCESSED;
+}
+
+
+int hostapd_acl_init(hostapd *hapd)
+{
+	if (radius_client_register(hapd->radius, RADIUS_AUTH,
+				   hostapd_acl_recv_radius, hapd))
+		return -1;
+
+	eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
+
+	return 0;
+}
+
+
+void hostapd_acl_deinit(hostapd *hapd)
+{
+	struct hostapd_acl_query_data *query, *prev;
+
+	hostapd_acl_cache_free(hapd->acl_cache);
+
+	query = hapd->acl_queries;
+	while (query) {
+		prev = query;
+		query = query->next;
+		hostapd_acl_query_free(prev);
+	}
+}