mirror of
https://github.com/vanhoefm/fragattacks.git
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af5389610b
Use monotonic clock for both cache and query timeouts. Signed-hostap: Johannes Berg <johannes.berg@intel.com>
644 lines
17 KiB
C
644 lines
17 KiB
C
/*
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* hostapd / IEEE 802.11 authentication (ACL)
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* Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*
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* Access control list for IEEE 802.11 authentication can uses statically
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* configured ACL from configuration files or an external RADIUS server.
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* Results from external RADIUS queries are cached to allow faster
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* authentication frame processing.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "utils/eloop.h"
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#include "crypto/sha1.h"
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#include "radius/radius.h"
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#include "radius/radius_client.h"
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#include "hostapd.h"
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#include "ap_config.h"
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#include "ap_drv_ops.h"
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#include "ieee802_11.h"
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#include "ieee802_1x.h"
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#include "ieee802_11_auth.h"
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#define RADIUS_ACL_TIMEOUT 30
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struct hostapd_cached_radius_acl {
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struct os_reltime 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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struct hostapd_sta_wpa_psk_short *psk;
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char *identity;
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char *radius_cui;
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};
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struct hostapd_acl_query_data {
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struct os_reltime 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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#ifndef CONFIG_NO_RADIUS
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static void hostapd_acl_cache_free_entry(struct hostapd_cached_radius_acl *e)
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{
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os_free(e->identity);
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os_free(e->radius_cui);
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hostapd_free_psk_list(e->psk);
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os_free(e);
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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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hostapd_acl_cache_free_entry(prev);
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}
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}
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static void copy_psk_list(struct hostapd_sta_wpa_psk_short **psk,
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struct hostapd_sta_wpa_psk_short *src)
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{
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struct hostapd_sta_wpa_psk_short **copy_to;
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struct hostapd_sta_wpa_psk_short *copy_from;
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/* Copy PSK linked list */
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copy_to = psk;
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copy_from = src;
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while (copy_from && copy_to) {
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*copy_to = os_zalloc(sizeof(struct hostapd_sta_wpa_psk_short));
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if (*copy_to == NULL)
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break;
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os_memcpy(*copy_to, copy_from,
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sizeof(struct hostapd_sta_wpa_psk_short));
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copy_from = copy_from->next;
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copy_to = &((*copy_to)->next);
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}
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if (copy_to)
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*copy_to = NULL;
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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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struct hostapd_sta_wpa_psk_short **psk,
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char **identity, char **radius_cui)
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{
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struct hostapd_cached_radius_acl *entry;
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struct os_reltime now;
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os_get_reltime(&now);
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for (entry = hapd->acl_cache; entry; entry = entry->next) {
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if (os_memcmp(entry->addr, addr, ETH_ALEN) != 0)
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continue;
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if (os_reltime_expired(&now, &entry->timestamp,
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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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if (session_timeout)
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*session_timeout = entry->session_timeout;
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if (acct_interim_interval)
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*acct_interim_interval =
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entry->acct_interim_interval;
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if (vlan_id)
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*vlan_id = entry->vlan_id;
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copy_psk_list(psk, entry->psk);
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if (identity) {
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if (entry->identity)
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*identity = os_strdup(entry->identity);
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else
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*identity = NULL;
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}
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if (radius_cui) {
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if (entry->radius_cui)
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*radius_cui = os_strdup(entry->radius_cui);
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else
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*radius_cui = NULL;
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}
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return entry->accepted;
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}
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return -1;
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}
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#endif /* CONFIG_NO_RADIUS */
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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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os_free(query->auth_msg);
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os_free(query);
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}
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#ifndef CONFIG_NO_RADIUS
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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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os_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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os_strlen(buf))) {
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wpa_printf(MSG_DEBUG, "Could not add User-Name");
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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, os_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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wpa_printf(MSG_DEBUG, "Could not add User-Password");
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goto fail;
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}
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if (add_common_radius_attr(hapd, hapd->conf->radius_auth_req_attr,
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NULL, msg) < 0)
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goto fail;
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os_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, os_strlen(buf))) {
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wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id");
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goto fail;
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}
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os_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, os_strlen(buf))) {
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wpa_printf(MSG_DEBUG, "Could not add Connect-Info");
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goto fail;
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}
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if (radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr) < 0)
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goto fail;
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return 0;
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fail:
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radius_msg_free(msg);
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return -1;
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}
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#endif /* CONFIG_NO_RADIUS */
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/**
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* hostapd_allowed_address - Check whether a specified STA can be authenticated
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* @hapd: hostapd BSS data
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* @addr: MAC address of the STA
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* @msg: Authentication message
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* @len: Length of msg in octets
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* @session_timeout: Buffer for returning session timeout (from RADIUS)
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* @acct_interim_interval: Buffer for returning account interval (from RADIUS)
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* @vlan_id: Buffer for returning VLAN ID
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* @psk: Linked list buffer for returning WPA PSK
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* @identity: Buffer for returning identity (from RADIUS)
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* @radius_cui: Buffer for returning CUI (from RADIUS)
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* Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING
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*
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* The caller is responsible for freeing the returned *identity and *radius_cui
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* values with os_free().
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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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struct hostapd_sta_wpa_psk_short **psk,
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char **identity, char **radius_cui)
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{
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if (session_timeout)
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*session_timeout = 0;
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if (acct_interim_interval)
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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 (psk)
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*psk = NULL;
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if (identity)
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*identity = NULL;
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if (radius_cui)
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*radius_cui = NULL;
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if (hostapd_maclist_found(hapd->conf->accept_mac,
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hapd->conf->num_accept_mac, addr, vlan_id))
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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, vlan_id))
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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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#ifdef CONFIG_NO_RADIUS
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return HOSTAPD_ACL_REJECT;
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#else /* CONFIG_NO_RADIUS */
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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, psk,
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identity, radius_cui);
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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 (os_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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if (identity) {
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os_free(*identity);
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*identity = NULL;
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}
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if (radius_cui) {
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os_free(*radius_cui);
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*radius_cui = NULL;
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}
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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 = os_zalloc(sizeof(*query));
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if (query == NULL) {
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wpa_printf(MSG_ERROR, "malloc for query data failed");
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return HOSTAPD_ACL_REJECT;
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}
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os_get_reltime(&query->timestamp);
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os_memcpy(query->addr, addr, ETH_ALEN);
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if (hostapd_radius_acl_query(hapd, addr, query)) {
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wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
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"for ACL query.");
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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 = os_malloc(len);
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if (query->auth_msg == NULL) {
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wpa_printf(MSG_ERROR, "Failed to allocate memory for "
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"auth frame.");
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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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os_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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#endif /* CONFIG_NO_RADIUS */
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}
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return HOSTAPD_ACL_REJECT;
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}
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#ifndef CONFIG_NO_RADIUS
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static void hostapd_acl_expire_cache(struct hostapd_data *hapd,
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struct os_reltime *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 (os_reltime_expired(now, &entry->timestamp,
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RADIUS_ACL_TIMEOUT)) {
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wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR
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" has expired.", 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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hostapd_drv_set_radius_acl_expire(hapd, entry->addr);
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tmp = entry;
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entry = entry->next;
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hostapd_acl_cache_free_entry(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,
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struct os_reltime *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 (os_reltime_expired(now, &entry->timestamp,
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RADIUS_ACL_TIMEOUT)) {
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wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
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" has expired.", 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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/**
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* hostapd_acl_expire - ACL cache expiration callback
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* @eloop_ctx: struct hostapd_data *
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* @timeout_ctx: Not used
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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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struct os_reltime now;
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os_get_reltime(&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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static void decode_tunnel_passwords(struct hostapd_data *hapd,
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const u8 *shared_secret,
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size_t shared_secret_len,
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struct radius_msg *msg,
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struct radius_msg *req,
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struct hostapd_cached_radius_acl *cache)
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{
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int passphraselen;
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char *passphrase, *strpassphrase;
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size_t i;
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struct hostapd_sta_wpa_psk_short *psk;
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/*
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* Decode all tunnel passwords as PSK and save them into a linked list.
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*/
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for (i = 0; ; i++) {
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passphrase = radius_msg_get_tunnel_password(
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msg, &passphraselen, shared_secret, shared_secret_len,
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req, i);
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/*
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* Passphrase is NULL iff there is no i-th Tunnel-Password
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* attribute in msg.
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*/
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if (passphrase == NULL)
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break;
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/*
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* passphrase does not contain the NULL termination.
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* Add it here as pbkdf2_sha1() requires it.
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*/
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strpassphrase = os_zalloc(passphraselen + 1);
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psk = os_zalloc(sizeof(struct hostapd_sta_wpa_psk_short));
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if (strpassphrase && psk) {
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os_memcpy(strpassphrase, passphrase, passphraselen);
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pbkdf2_sha1(strpassphrase,
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hapd->conf->ssid.ssid,
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hapd->conf->ssid.ssid_len, 4096,
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psk->psk, PMK_LEN);
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psk->next = cache->psk;
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cache->psk = psk;
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psk = NULL;
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}
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os_free(strpassphrase);
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os_free(psk);
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os_free(passphrase);
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}
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}
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/**
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* hostapd_acl_recv_radius - Process incoming RADIUS Authentication messages
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* @msg: RADIUS response message
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* @req: RADIUS request message
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* @shared_secret: RADIUS shared secret
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* @shared_secret_len: Length of shared_secret in octets
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* @data: Context data (struct hostapd_data *)
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* Returns: RADIUS_RX_PROCESSED if RADIUS message was a reply to ACL query (and
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* was processed here) or RADIUS_RX_UNKNOWN if not.
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*/
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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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const 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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struct radius_hdr *hdr = radius_msg_get_hdr(msg);
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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 == hdr->identifier)
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break;
|
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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 (hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
|
|
hdr->code != RADIUS_CODE_ACCESS_REJECT) {
|
|
wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
|
|
"query", 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;
|
|
}
|
|
os_get_reltime(&cache->timestamp);
|
|
os_memcpy(cache->addr, query->addr, sizeof(cache->addr));
|
|
if (hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
|
|
u8 *buf;
|
|
size_t len;
|
|
|
|
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);
|
|
|
|
decode_tunnel_passwords(hapd, shared_secret, shared_secret_len,
|
|
msg, req, cache);
|
|
|
|
if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_USER_NAME,
|
|
&buf, &len, NULL) == 0) {
|
|
cache->identity = os_zalloc(len + 1);
|
|
if (cache->identity)
|
|
os_memcpy(cache->identity, buf, len);
|
|
}
|
|
if (radius_msg_get_attr_ptr(
|
|
msg, RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
|
|
&buf, &len, NULL) == 0) {
|
|
cache->radius_cui = os_zalloc(len + 1);
|
|
if (cache->radius_cui)
|
|
os_memcpy(cache->radius_cui, buf, len);
|
|
}
|
|
|
|
if (hapd->conf->wpa_psk_radius == PSK_RADIUS_REQUIRED &&
|
|
!cache->psk)
|
|
cache->accepted = HOSTAPD_ACL_REJECT;
|
|
} else
|
|
cache->accepted = HOSTAPD_ACL_REJECT;
|
|
cache->next = hapd->acl_cache;
|
|
hapd->acl_cache = cache;
|
|
|
|
#ifdef CONFIG_DRIVER_RADIUS_ACL
|
|
hostapd_drv_set_radius_acl_auth(hapd, query->addr, cache->accepted,
|
|
cache->session_timeout);
|
|
#else /* CONFIG_DRIVER_RADIUS_ACL */
|
|
#ifdef NEED_AP_MLME
|
|
/* 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, NULL);
|
|
#endif /* NEED_AP_MLME */
|
|
#endif /* CONFIG_DRIVER_RADIUS_ACL */
|
|
|
|
done:
|
|
if (prev == NULL)
|
|
hapd->acl_queries = query->next;
|
|
else
|
|
prev->next = query->next;
|
|
|
|
hostapd_acl_query_free(query);
|
|
|
|
return RADIUS_RX_PROCESSED;
|
|
}
|
|
#endif /* CONFIG_NO_RADIUS */
|
|
|
|
|
|
/**
|
|
* hostapd_acl_init: Initialize IEEE 802.11 ACL
|
|
* @hapd: hostapd BSS data
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int hostapd_acl_init(struct hostapd_data *hapd)
|
|
{
|
|
#ifndef CONFIG_NO_RADIUS
|
|
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);
|
|
#endif /* CONFIG_NO_RADIUS */
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* hostapd_acl_deinit - Deinitialize IEEE 802.11 ACL
|
|
* @hapd: hostapd BSS data
|
|
*/
|
|
void hostapd_acl_deinit(struct hostapd_data *hapd)
|
|
{
|
|
struct hostapd_acl_query_data *query, *prev;
|
|
|
|
#ifndef CONFIG_NO_RADIUS
|
|
eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);
|
|
|
|
hostapd_acl_cache_free(hapd->acl_cache);
|
|
#endif /* CONFIG_NO_RADIUS */
|
|
|
|
query = hapd->acl_queries;
|
|
while (query) {
|
|
prev = query;
|
|
query = query->next;
|
|
hostapd_acl_query_free(prev);
|
|
}
|
|
}
|
|
|
|
|
|
void hostapd_free_psk_list(struct hostapd_sta_wpa_psk_short *psk)
|
|
{
|
|
while (psk) {
|
|
struct hostapd_sta_wpa_psk_short *prev = psk;
|
|
psk = psk->next;
|
|
os_free(prev);
|
|
}
|
|
}
|