474 lines
12 KiB
C
474 lines
12 KiB
C
/*
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* hostapd / IEEE 802.11 authentication (ACL)
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* Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#ifndef CONFIG_NATIVE_WINDOWS
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#include "hostapd.h"
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#include "ieee802_11.h"
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#include "ieee802_11_auth.h"
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#include "radius.h"
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#include "radius_client.h"
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#include "eloop.h"
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#define RADIUS_ACL_TIMEOUT 30
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struct hostapd_cached_radius_acl {
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time_t timestamp;
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macaddr addr;
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int accepted; /* HOSTAPD_ACL_* */
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struct hostapd_cached_radius_acl *next;
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u32 session_timeout;
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u32 acct_interim_interval;
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int vlan_id;
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};
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struct hostapd_acl_query_data {
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time_t timestamp;
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u8 radius_id;
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macaddr addr;
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u8 *auth_msg; /* IEEE 802.11 authentication frame from station */
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size_t auth_msg_len;
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struct hostapd_acl_query_data *next;
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};
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static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache)
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{
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struct hostapd_cached_radius_acl *prev;
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while (acl_cache) {
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prev = acl_cache;
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acl_cache = acl_cache->next;
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free(prev);
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}
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}
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static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr,
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u32 *session_timeout,
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u32 *acct_interim_interval, int *vlan_id)
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{
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struct hostapd_cached_radius_acl *entry;
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time_t now;
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time(&now);
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entry = hapd->acl_cache;
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while (entry) {
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if (memcmp(entry->addr, addr, ETH_ALEN) == 0) {
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if (now - entry->timestamp > RADIUS_ACL_TIMEOUT)
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return -1; /* entry has expired */
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if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT)
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*session_timeout = entry->session_timeout;
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*acct_interim_interval = entry->acct_interim_interval;
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if (vlan_id)
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*vlan_id = entry->vlan_id;
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return entry->accepted;
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}
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entry = entry->next;
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}
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return -1;
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}
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static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
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{
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if (query == NULL)
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return;
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free(query->auth_msg);
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free(query);
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}
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static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr,
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struct hostapd_acl_query_data *query)
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{
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struct radius_msg *msg;
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char buf[128];
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query->radius_id = radius_client_get_id(hapd->radius);
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msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id);
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if (msg == NULL)
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return -1;
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radius_msg_make_authenticator(msg, addr, ETH_ALEN);
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snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
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if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
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strlen(buf))) {
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printf("Could not add User-Name\n");
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goto fail;
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}
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if (!radius_msg_add_attr_user_password(
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msg, (u8 *) buf, strlen(buf),
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hapd->conf->radius->auth_server->shared_secret,
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hapd->conf->radius->auth_server->shared_secret_len)) {
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printf("Could not add User-Password\n");
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goto fail;
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}
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if (hapd->conf->own_ip_addr.af == AF_INET &&
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!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
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(u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
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printf("Could not add NAS-IP-Address\n");
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goto fail;
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}
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#ifdef CONFIG_IPV6
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if (hapd->conf->own_ip_addr.af == AF_INET6 &&
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!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
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(u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
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printf("Could not add NAS-IPv6-Address\n");
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goto fail;
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}
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#endif /* CONFIG_IPV6 */
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if (hapd->conf->nas_identifier &&
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!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
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(u8 *) hapd->conf->nas_identifier,
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strlen(hapd->conf->nas_identifier))) {
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printf("Could not add NAS-Identifier\n");
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goto fail;
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}
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snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
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MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
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if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
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(u8 *) buf, strlen(buf))) {
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printf("Could not add Called-Station-Id\n");
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goto fail;
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}
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snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
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MAC2STR(addr));
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if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
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(u8 *) buf, strlen(buf))) {
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printf("Could not add Calling-Station-Id\n");
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goto fail;
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}
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if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
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RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
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printf("Could not add NAS-Port-Type\n");
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goto fail;
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}
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snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
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if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
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(u8 *) buf, strlen(buf))) {
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printf("Could not add Connect-Info\n");
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goto fail;
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}
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radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
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return 0;
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fail:
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radius_msg_free(msg);
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free(msg);
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return -1;
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}
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int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
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const u8 *msg, size_t len, u32 *session_timeout,
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u32 *acct_interim_interval, int *vlan_id)
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{
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*session_timeout = 0;
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*acct_interim_interval = 0;
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if (vlan_id)
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*vlan_id = 0;
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if (hostapd_maclist_found(hapd->conf->accept_mac,
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hapd->conf->num_accept_mac, addr))
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return HOSTAPD_ACL_ACCEPT;
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if (hostapd_maclist_found(hapd->conf->deny_mac,
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hapd->conf->num_deny_mac, addr))
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return HOSTAPD_ACL_REJECT;
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if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
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return HOSTAPD_ACL_ACCEPT;
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if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
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return HOSTAPD_ACL_REJECT;
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if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
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struct hostapd_acl_query_data *query;
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/* Check whether ACL cache has an entry for this station */
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int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
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acct_interim_interval,
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vlan_id);
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if (res == HOSTAPD_ACL_ACCEPT ||
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res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
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return res;
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if (res == HOSTAPD_ACL_REJECT)
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return HOSTAPD_ACL_REJECT;
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query = hapd->acl_queries;
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while (query) {
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if (memcmp(query->addr, addr, ETH_ALEN) == 0) {
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/* pending query in RADIUS retransmit queue;
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* do not generate a new one */
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return HOSTAPD_ACL_PENDING;
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}
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query = query->next;
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}
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if (!hapd->conf->radius->auth_server)
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return HOSTAPD_ACL_REJECT;
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/* No entry in the cache - query external RADIUS server */
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query = wpa_zalloc(sizeof(*query));
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if (query == NULL) {
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printf("malloc for query data failed\n");
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return HOSTAPD_ACL_REJECT;
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}
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time(&query->timestamp);
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memcpy(query->addr, addr, ETH_ALEN);
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if (hostapd_radius_acl_query(hapd, addr, query)) {
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printf("Failed to send Access-Request for ACL "
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"query.\n");
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hostapd_acl_query_free(query);
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return HOSTAPD_ACL_REJECT;
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}
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query->auth_msg = malloc(len);
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if (query->auth_msg == NULL) {
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printf("Failed to allocate memory for auth frame.\n");
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hostapd_acl_query_free(query);
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return HOSTAPD_ACL_REJECT;
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}
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memcpy(query->auth_msg, msg, len);
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query->auth_msg_len = len;
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query->next = hapd->acl_queries;
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hapd->acl_queries = query;
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/* Queued data will be processed in hostapd_acl_recv_radius()
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* when RADIUS server replies to the sent Access-Request. */
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return HOSTAPD_ACL_PENDING;
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}
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return HOSTAPD_ACL_REJECT;
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}
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static void hostapd_acl_expire_cache(struct hostapd_data *hapd, time_t now)
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{
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struct hostapd_cached_radius_acl *prev, *entry, *tmp;
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prev = NULL;
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entry = hapd->acl_cache;
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while (entry) {
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if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
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HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
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"Cached ACL entry for " MACSTR
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" has expired.\n", MAC2STR(entry->addr));
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if (prev)
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prev->next = entry->next;
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else
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hapd->acl_cache = entry->next;
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tmp = entry;
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entry = entry->next;
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free(tmp);
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continue;
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}
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prev = entry;
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entry = entry->next;
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}
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}
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static void hostapd_acl_expire_queries(struct hostapd_data *hapd, time_t now)
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{
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struct hostapd_acl_query_data *prev, *entry, *tmp;
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prev = NULL;
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entry = hapd->acl_queries;
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while (entry) {
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if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
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HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
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"ACL query for " MACSTR
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" has expired.\n", MAC2STR(entry->addr));
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if (prev)
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prev->next = entry->next;
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else
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hapd->acl_queries = entry->next;
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tmp = entry;
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entry = entry->next;
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hostapd_acl_query_free(tmp);
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continue;
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}
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prev = entry;
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entry = entry->next;
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}
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}
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static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
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{
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struct hostapd_data *hapd = eloop_ctx;
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time_t now;
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time(&now);
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hostapd_acl_expire_cache(hapd, now);
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hostapd_acl_expire_queries(hapd, now);
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eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
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}
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/* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
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* or -1 if not. */
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static RadiusRxResult
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hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
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u8 *shared_secret, size_t shared_secret_len,
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void *data)
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{
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struct hostapd_data *hapd = data;
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struct hostapd_acl_query_data *query, *prev;
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struct hostapd_cached_radius_acl *cache;
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query = hapd->acl_queries;
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prev = NULL;
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while (query) {
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if (query->radius_id == msg->hdr->identifier)
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break;
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prev = query;
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query = query->next;
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}
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if (query == NULL)
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return RADIUS_RX_UNKNOWN;
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HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Found matching Access-Request "
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"for RADIUS message (id=%d)\n", query->radius_id);
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if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
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printf("Incoming RADIUS packet did not have correct "
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"authenticator - dropped\n");
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return RADIUS_RX_INVALID_AUTHENTICATOR;
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}
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if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
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msg->hdr->code != RADIUS_CODE_ACCESS_REJECT) {
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printf("Unknown RADIUS message code %d to ACL query\n",
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msg->hdr->code);
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return RADIUS_RX_UNKNOWN;
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}
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/* Insert Accept/Reject info into ACL cache */
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cache = wpa_zalloc(sizeof(*cache));
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if (cache == NULL) {
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printf("Failed to add ACL cache entry\n");
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goto done;
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}
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time(&cache->timestamp);
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memcpy(cache->addr, query->addr, sizeof(cache->addr));
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if (msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
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if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
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&cache->session_timeout) == 0)
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cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
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else
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cache->accepted = HOSTAPD_ACL_ACCEPT;
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if (radius_msg_get_attr_int32(
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msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
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&cache->acct_interim_interval) == 0 &&
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cache->acct_interim_interval < 60) {
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HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Ignored too "
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"small Acct-Interim-Interval %d for "
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"STA " MACSTR "\n",
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cache->acct_interim_interval,
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MAC2STR(query->addr));
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cache->acct_interim_interval = 0;
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}
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cache->vlan_id = radius_msg_get_vlanid(msg);
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} else
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cache->accepted = HOSTAPD_ACL_REJECT;
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cache->next = hapd->acl_cache;
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hapd->acl_cache = cache;
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/* Re-send original authentication frame for 802.11 processing */
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HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Re-sending authentication frame "
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"after successful RADIUS ACL query\n");
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ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
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WLAN_FC_STYPE_AUTH, NULL);
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done:
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if (prev == NULL)
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hapd->acl_queries = query->next;
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else
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prev->next = query->next;
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hostapd_acl_query_free(query);
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return RADIUS_RX_PROCESSED;
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}
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int hostapd_acl_init(struct hostapd_data *hapd)
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{
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if (radius_client_register(hapd->radius, RADIUS_AUTH,
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hostapd_acl_recv_radius, hapd))
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return -1;
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eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
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return 0;
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}
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void hostapd_acl_deinit(struct hostapd_data *hapd)
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{
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struct hostapd_acl_query_data *query, *prev;
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eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);
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hostapd_acl_cache_free(hapd->acl_cache);
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query = hapd->acl_queries;
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while (query) {
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prev = query;
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query = query->next;
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hostapd_acl_query_free(prev);
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}
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}
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int hostapd_acl_reconfig(struct hostapd_data *hapd,
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struct hostapd_config *oldconf)
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{
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if (!hapd->radius_client_reconfigured)
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return 0;
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hostapd_acl_deinit(hapd);
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return hostapd_acl_init(hapd);
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}
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#endif /* CONFIG_NATIVE_WINDOWS */
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