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-rw-r--r--hostapd/ieee802_11_auth.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/hostapd/ieee802_11_auth.c b/hostapd/ieee802_11_auth.c
new file mode 100644
index 0000000..a705374
--- /dev/null
+++ b/hostapd/ieee802_11_auth.c
@@ -0,0 +1,471 @@
+/*
+ * hostapd / IEEE 802.11 authentication (ACL)
+ * Copyright (c) 2003-2007, Jouni Malinen <j@w1.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 "includes.h"
+
+#ifndef CONFIG_NATIVE_WINDOWS
+
+#include "hostapd.h"
+#include "ieee802_11.h"
+#include "ieee802_11_auth.h"
+#include "radius/radius.h"
+#include "radius/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;
+ int vlan_id;
+};
+
+
+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;
+ os_free(prev);
+ }
+}
+
+
+static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr,
+ u32 *session_timeout,
+ u32 *acct_interim_interval, int *vlan_id)
+{
+ struct hostapd_cached_radius_acl *entry;
+ time_t now;
+
+ time(&now);
+ entry = hapd->acl_cache;
+
+ while (entry) {
+ if (os_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;
+ if (vlan_id)
+ *vlan_id = entry->vlan_id;
+ return entry->accepted;
+ }
+
+ entry = entry->next;
+ }
+
+ return -1;
+}
+
+
+static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
+{
+ if (query == NULL)
+ return;
+ os_free(query->auth_msg);
+ os_free(query);
+}
+
+
+static int hostapd_radius_acl_query(struct hostapd_data *hapd, const 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);
+
+ os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
+ if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
+ os_strlen(buf))) {
+ wpa_printf(MSG_DEBUG, "Could not add User-Name");
+ goto fail;
+ }
+
+ if (!radius_msg_add_attr_user_password(
+ msg, (u8 *) buf, os_strlen(buf),
+ hapd->conf->radius->auth_server->shared_secret,
+ hapd->conf->radius->auth_server->shared_secret_len)) {
+ wpa_printf(MSG_DEBUG, "Could not add User-Password");
+ goto fail;
+ }
+
+ if (hapd->conf->own_ip_addr.af == AF_INET &&
+ !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
+ (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
+ wpa_printf(MSG_DEBUG, "Could not add NAS-IP-Address");
+ goto fail;
+ }
+
+#ifdef CONFIG_IPV6
+ if (hapd->conf->own_ip_addr.af == AF_INET6 &&
+ !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
+ (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
+ wpa_printf(MSG_DEBUG, "Could not add NAS-IPv6-Address");
+ goto fail;
+ }
+#endif /* CONFIG_IPV6 */
+
+ if (hapd->conf->nas_identifier &&
+ !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
+ (u8 *) hapd->conf->nas_identifier,
+ os_strlen(hapd->conf->nas_identifier))) {
+ wpa_printf(MSG_DEBUG, "Could not add NAS-Identifier");
+ goto fail;
+ }
+
+ os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
+ MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
+ if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
+ (u8 *) buf, os_strlen(buf))) {
+ wpa_printf(MSG_DEBUG, "Could not add Called-Station-Id");
+ goto fail;
+ }
+
+ os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
+ MAC2STR(addr));
+ if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
+ (u8 *) buf, os_strlen(buf))) {
+ wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id");
+ goto fail;
+ }
+
+ if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
+ RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
+ wpa_printf(MSG_DEBUG, "Could not add NAS-Port-Type");
+ goto fail;
+ }
+
+ os_snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
+ if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
+ (u8 *) buf, os_strlen(buf))) {
+ wpa_printf(MSG_DEBUG, "Could not add Connect-Info");
+ goto fail;
+ }
+
+ radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
+ return 0;
+
+ fail:
+ radius_msg_free(msg);
+ os_free(msg);
+ return -1;
+}
+
+
+int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
+ const u8 *msg, size_t len, u32 *session_timeout,
+ u32 *acct_interim_interval, int *vlan_id)
+{
+ *session_timeout = 0;
+ *acct_interim_interval = 0;
+ if (vlan_id)
+ *vlan_id = 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,
+ vlan_id);
+ 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 (os_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->radius->auth_server)
+ return HOSTAPD_ACL_REJECT;
+
+ /* No entry in the cache - query external RADIUS server */
+ query = os_zalloc(sizeof(*query));
+ if (query == NULL) {
+ wpa_printf(MSG_ERROR, "malloc for query data failed");
+ return HOSTAPD_ACL_REJECT;
+ }
+ time(&query->timestamp);
+ os_memcpy(query->addr, addr, ETH_ALEN);
+ if (hostapd_radius_acl_query(hapd, addr, query)) {
+ wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
+ "for ACL query.");
+ hostapd_acl_query_free(query);
+ return HOSTAPD_ACL_REJECT;
+ }
+
+ query->auth_msg = os_malloc(len);
+ if (query->auth_msg == NULL) {
+ wpa_printf(MSG_ERROR, "Failed to allocate memory for "
+ "auth frame.");
+ hostapd_acl_query_free(query);
+ return HOSTAPD_ACL_REJECT;
+ }
+ os_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(struct hostapd_data *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) {
+ wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR
+ " has expired.", MAC2STR(entry->addr));
+ if (prev)
+ prev->next = entry->next;
+ else
+ hapd->acl_cache = entry->next;
+
+ tmp = entry;
+ entry = entry->next;
+ os_free(tmp);
+ continue;
+ }
+
+ prev = entry;
+ entry = entry->next;
+ }
+}
+
+
+static void hostapd_acl_expire_queries(struct hostapd_data *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) {
+ wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
+ " has expired.", 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)
+{
+ struct hostapd_data *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;
+
+ wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS "
+ "message (id=%d)", query->radius_id);
+
+ if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
+ wpa_printf(MSG_INFO, "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) {
+ wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
+ "query", msg->hdr->code);
+ return RADIUS_RX_UNKNOWN;
+ }
+
+ /* Insert Accept/Reject info into ACL cache */
+ cache = os_zalloc(sizeof(*cache));
+ if (cache == NULL) {
+ wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry");
+ goto done;
+ }
+ time(&cache->timestamp);
+ os_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) {
+ wpa_printf(MSG_DEBUG, "Ignored too small "
+ "Acct-Interim-Interval %d for STA " MACSTR,
+ cache->acct_interim_interval,
+ MAC2STR(query->addr));
+ cache->acct_interim_interval = 0;
+ }
+
+ cache->vlan_id = radius_msg_get_vlanid(msg);
+ } else
+ cache->accepted = HOSTAPD_ACL_REJECT;
+ cache->next = hapd->acl_cache;
+ hapd->acl_cache = cache;
+
+ /* Re-send original authentication frame for 802.11 processing */
+ wpa_printf(MSG_DEBUG, "Re-sending authentication frame after "
+ "successful RADIUS ACL query");
+ ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
+ WLAN_FC_STYPE_AUTH, NULL);
+
+ 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(struct hostapd_data *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(struct hostapd_data *hapd)
+{
+ struct hostapd_acl_query_data *query, *prev;
+
+ eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);
+
+ hostapd_acl_cache_free(hapd->acl_cache);
+
+ query = hapd->acl_queries;
+ while (query) {
+ prev = query;
+ query = query->next;
+ hostapd_acl_query_free(prev);
+ }
+}
+
+
+int hostapd_acl_reconfig(struct hostapd_data *hapd,
+ struct hostapd_config *oldconf)
+{
+ if (!hapd->radius_client_reconfigured)
+ return 0;
+
+ hostapd_acl_deinit(hapd);
+ return hostapd_acl_init(hapd);
+}
+
+#endif /* CONFIG_NATIVE_WINDOWS */