mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-26 17:28:29 -05:00
1238 lines
30 KiB
C
1238 lines
30 KiB
C
/*
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* hostapd / RADIUS authentication server
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* Copyright (c) 2005-2008, 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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#include <net/if.h>
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#include "common.h"
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#include "radius.h"
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#include "eloop.h"
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#include "defs.h"
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#include "eap_server/eap.h"
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#include "radius_server.h"
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#define RADIUS_SESSION_TIMEOUT 60
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#define RADIUS_MAX_SESSION 100
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#define RADIUS_MAX_MSG_LEN 3000
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static struct eapol_callbacks radius_server_eapol_cb;
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struct radius_client;
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struct radius_server_data;
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struct radius_server_counters {
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u32 access_requests;
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u32 invalid_requests;
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u32 dup_access_requests;
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u32 access_accepts;
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u32 access_rejects;
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u32 access_challenges;
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u32 malformed_access_requests;
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u32 bad_authenticators;
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u32 packets_dropped;
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u32 unknown_types;
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};
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struct radius_session {
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struct radius_session *next;
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struct radius_client *client;
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struct radius_server_data *server;
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unsigned int sess_id;
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struct eap_sm *eap;
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struct eap_eapol_interface *eap_if;
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struct radius_msg *last_msg;
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char *last_from_addr;
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int last_from_port;
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struct sockaddr_storage last_from;
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socklen_t last_fromlen;
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u8 last_identifier;
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struct radius_msg *last_reply;
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u8 last_authenticator[16];
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};
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struct radius_client {
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struct radius_client *next;
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struct in_addr addr;
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struct in_addr mask;
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#ifdef CONFIG_IPV6
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struct in6_addr addr6;
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struct in6_addr mask6;
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#endif /* CONFIG_IPV6 */
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char *shared_secret;
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int shared_secret_len;
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struct radius_session *sessions;
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struct radius_server_counters counters;
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};
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struct radius_server_data {
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int auth_sock;
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struct radius_client *clients;
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unsigned int next_sess_id;
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void *conf_ctx;
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int num_sess;
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void *eap_sim_db_priv;
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void *ssl_ctx;
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u8 *pac_opaque_encr_key;
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char *eap_fast_a_id;
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int eap_sim_aka_result_ind;
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int ipv6;
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struct os_time start_time;
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struct radius_server_counters counters;
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int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
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int phase2, struct eap_user *user);
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};
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extern int wpa_debug_level;
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#define RADIUS_DEBUG(args...) \
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wpa_printf(MSG_DEBUG, "RADIUS SRV: " args)
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#define RADIUS_ERROR(args...) \
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wpa_printf(MSG_ERROR, "RADIUS SRV: " args)
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#define RADIUS_DUMP(args...) \
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wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args)
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#define RADIUS_DUMP_ASCII(args...) \
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wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args)
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static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx);
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static struct radius_client *
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radius_server_get_client(struct radius_server_data *data, struct in_addr *addr,
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int ipv6)
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{
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struct radius_client *client = data->clients;
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while (client) {
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#ifdef CONFIG_IPV6
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if (ipv6) {
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struct in6_addr *addr6;
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int i;
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addr6 = (struct in6_addr *) addr;
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for (i = 0; i < 16; i++) {
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if ((addr6->s6_addr[i] &
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client->mask6.s6_addr[i]) !=
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(client->addr6.s6_addr[i] &
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client->mask6.s6_addr[i])) {
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i = 17;
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break;
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}
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}
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if (i == 16) {
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break;
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}
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}
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#endif /* CONFIG_IPV6 */
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if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) ==
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(addr->s_addr & client->mask.s_addr)) {
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break;
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}
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client = client->next;
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}
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return client;
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}
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static struct radius_session *
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radius_server_get_session(struct radius_client *client, unsigned int sess_id)
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{
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struct radius_session *sess = client->sessions;
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while (sess) {
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if (sess->sess_id == sess_id) {
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break;
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}
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sess = sess->next;
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}
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return sess;
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}
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static void radius_server_session_free(struct radius_server_data *data,
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struct radius_session *sess)
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{
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eloop_cancel_timeout(radius_server_session_timeout, data, sess);
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eap_server_sm_deinit(sess->eap);
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if (sess->last_msg) {
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radius_msg_free(sess->last_msg);
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os_free(sess->last_msg);
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}
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os_free(sess->last_from_addr);
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if (sess->last_reply) {
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radius_msg_free(sess->last_reply);
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os_free(sess->last_reply);
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}
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os_free(sess);
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data->num_sess--;
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}
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static void radius_server_session_remove_timeout(void *eloop_ctx,
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void *timeout_ctx);
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static void radius_server_session_remove(struct radius_server_data *data,
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struct radius_session *sess)
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{
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struct radius_client *client = sess->client;
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struct radius_session *session, *prev;
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eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
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prev = NULL;
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session = client->sessions;
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while (session) {
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if (session == sess) {
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if (prev == NULL) {
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client->sessions = sess->next;
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} else {
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prev->next = sess->next;
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}
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radius_server_session_free(data, sess);
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break;
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}
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prev = session;
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session = session->next;
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}
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}
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static void radius_server_session_remove_timeout(void *eloop_ctx,
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void *timeout_ctx)
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{
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struct radius_server_data *data = eloop_ctx;
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struct radius_session *sess = timeout_ctx;
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RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id);
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radius_server_session_remove(data, sess);
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}
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static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx)
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{
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struct radius_server_data *data = eloop_ctx;
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struct radius_session *sess = timeout_ctx;
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RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id);
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radius_server_session_remove(data, sess);
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}
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static struct radius_session *
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radius_server_new_session(struct radius_server_data *data,
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struct radius_client *client)
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{
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struct radius_session *sess;
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if (data->num_sess >= RADIUS_MAX_SESSION) {
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RADIUS_DEBUG("Maximum number of existing session - no room "
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"for a new session");
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return NULL;
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}
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sess = os_zalloc(sizeof(*sess));
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if (sess == NULL)
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return NULL;
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sess->server = data;
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sess->client = client;
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sess->sess_id = data->next_sess_id++;
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sess->next = client->sessions;
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client->sessions = sess;
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eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0,
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radius_server_session_timeout, data, sess);
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data->num_sess++;
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return sess;
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}
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static struct radius_session *
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radius_server_get_new_session(struct radius_server_data *data,
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struct radius_client *client,
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struct radius_msg *msg)
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{
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u8 *user;
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size_t user_len;
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int res;
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struct radius_session *sess;
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struct eap_config eap_conf;
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RADIUS_DEBUG("Creating a new session");
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user = os_malloc(256);
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if (user == NULL) {
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return NULL;
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}
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res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256);
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if (res < 0 || res > 256) {
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RADIUS_DEBUG("Could not get User-Name");
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os_free(user);
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return NULL;
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}
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user_len = res;
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RADIUS_DUMP_ASCII("User-Name", user, user_len);
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res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL);
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os_free(user);
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if (res == 0) {
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RADIUS_DEBUG("Matching user entry found");
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sess = radius_server_new_session(data, client);
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if (sess == NULL) {
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RADIUS_DEBUG("Failed to create a new session");
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return NULL;
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}
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} else {
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RADIUS_DEBUG("User-Name not found from user database");
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return NULL;
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}
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os_memset(&eap_conf, 0, sizeof(eap_conf));
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eap_conf.ssl_ctx = data->ssl_ctx;
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eap_conf.eap_sim_db_priv = data->eap_sim_db_priv;
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eap_conf.backend_auth = TRUE;
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eap_conf.eap_server = 1;
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eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key;
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eap_conf.eap_fast_a_id = data->eap_fast_a_id;
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eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind;
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sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb,
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&eap_conf);
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if (sess->eap == NULL) {
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RADIUS_DEBUG("Failed to initialize EAP state machine for the "
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"new session");
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radius_server_session_free(data, sess);
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return NULL;
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}
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sess->eap_if = eap_get_interface(sess->eap);
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sess->eap_if->eapRestart = TRUE;
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sess->eap_if->portEnabled = TRUE;
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RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id);
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return sess;
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}
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static struct radius_msg *
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radius_server_encapsulate_eap(struct radius_server_data *data,
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struct radius_client *client,
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struct radius_session *sess,
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struct radius_msg *request)
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{
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struct radius_msg *msg;
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int code;
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unsigned int sess_id;
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if (sess->eap_if->eapFail) {
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sess->eap_if->eapFail = FALSE;
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code = RADIUS_CODE_ACCESS_REJECT;
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} else if (sess->eap_if->eapSuccess) {
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sess->eap_if->eapSuccess = FALSE;
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code = RADIUS_CODE_ACCESS_ACCEPT;
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} else {
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sess->eap_if->eapReq = FALSE;
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code = RADIUS_CODE_ACCESS_CHALLENGE;
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}
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msg = radius_msg_new(code, request->hdr->identifier);
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if (msg == NULL) {
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RADIUS_DEBUG("Failed to allocate reply message");
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return NULL;
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}
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sess_id = htonl(sess->sess_id);
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if (code == RADIUS_CODE_ACCESS_CHALLENGE &&
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!radius_msg_add_attr(msg, RADIUS_ATTR_STATE,
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(u8 *) &sess_id, sizeof(sess_id))) {
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RADIUS_DEBUG("Failed to add State attribute");
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}
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if (sess->eap_if->eapReqData &&
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!radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData),
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wpabuf_len(sess->eap_if->eapReqData))) {
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RADIUS_DEBUG("Failed to add EAP-Message attribute");
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}
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if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) {
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int len;
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if (sess->eap_if->eapKeyDataLen > 64) {
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len = 32;
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} else {
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len = sess->eap_if->eapKeyDataLen / 2;
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}
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if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator,
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(u8 *) client->shared_secret,
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client->shared_secret_len,
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sess->eap_if->eapKeyData + len,
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len, sess->eap_if->eapKeyData,
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len)) {
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RADIUS_DEBUG("Failed to add MPPE key attributes");
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}
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}
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if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
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RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
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radius_msg_free(msg);
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os_free(msg);
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return NULL;
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}
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if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
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client->shared_secret_len,
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request->hdr->authenticator) < 0) {
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RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
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}
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return msg;
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}
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static int radius_server_reject(struct radius_server_data *data,
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struct radius_client *client,
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struct radius_msg *request,
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struct sockaddr *from, socklen_t fromlen,
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const char *from_addr, int from_port)
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{
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struct radius_msg *msg;
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int ret = 0;
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struct eap_hdr eapfail;
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RADIUS_DEBUG("Reject invalid request from %s:%d",
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from_addr, from_port);
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msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
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request->hdr->identifier);
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if (msg == NULL) {
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return -1;
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}
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os_memset(&eapfail, 0, sizeof(eapfail));
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eapfail.code = EAP_CODE_FAILURE;
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eapfail.identifier = 0;
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eapfail.length = host_to_be16(sizeof(eapfail));
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if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
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RADIUS_DEBUG("Failed to add EAP-Message attribute");
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}
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if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
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RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
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radius_msg_free(msg);
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os_free(msg);
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return -1;
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}
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if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
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client->shared_secret_len,
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request->hdr->authenticator) < 0) {
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RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
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}
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if (wpa_debug_level <= MSG_MSGDUMP) {
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radius_msg_dump(msg);
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}
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data->counters.access_rejects++;
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client->counters.access_rejects++;
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if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
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(struct sockaddr *) from, sizeof(*from)) < 0) {
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perror("sendto[RADIUS SRV]");
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ret = -1;
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}
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radius_msg_free(msg);
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os_free(msg);
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return ret;
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}
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static int radius_server_request(struct radius_server_data *data,
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struct radius_msg *msg,
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struct sockaddr *from, socklen_t fromlen,
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struct radius_client *client,
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const char *from_addr, int from_port,
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struct radius_session *force_sess)
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{
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u8 *eap = NULL;
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size_t eap_len;
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int res, state_included = 0;
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u8 statebuf[4];
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unsigned int state;
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struct radius_session *sess;
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struct radius_msg *reply;
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if (force_sess)
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sess = force_sess;
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else {
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res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
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sizeof(statebuf));
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state_included = res >= 0;
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if (res == sizeof(statebuf)) {
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state = WPA_GET_BE32(statebuf);
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sess = radius_server_get_session(client, state);
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} else {
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sess = NULL;
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}
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}
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if (sess) {
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RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
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} else if (state_included) {
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RADIUS_DEBUG("State attribute included but no session found");
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radius_server_reject(data, client, msg, from, fromlen,
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from_addr, from_port);
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return -1;
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} else {
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sess = radius_server_get_new_session(data, client, msg);
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if (sess == NULL) {
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RADIUS_DEBUG("Could not create a new session");
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radius_server_reject(data, client, msg, from, fromlen,
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from_addr, from_port);
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return -1;
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}
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}
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if (sess->last_from_port == from_port &&
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sess->last_identifier == msg->hdr->identifier &&
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os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
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0) {
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RADIUS_DEBUG("Duplicate message from %s", from_addr);
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data->counters.dup_access_requests++;
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client->counters.dup_access_requests++;
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if (sess->last_reply) {
|
|
res = sendto(data->auth_sock, sess->last_reply->buf,
|
|
sess->last_reply->buf_used, 0,
|
|
(struct sockaddr *) from, fromlen);
|
|
if (res < 0) {
|
|
perror("sendto[RADIUS SRV]");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
RADIUS_DEBUG("No previous reply available for duplicate "
|
|
"message");
|
|
return -1;
|
|
}
|
|
|
|
eap = radius_msg_get_eap(msg, &eap_len);
|
|
if (eap == NULL) {
|
|
RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
|
|
from_addr);
|
|
data->counters.packets_dropped++;
|
|
client->counters.packets_dropped++;
|
|
return -1;
|
|
}
|
|
|
|
RADIUS_DUMP("Received EAP data", eap, eap_len);
|
|
|
|
/* FIX: if Code is Request, Success, or Failure, send Access-Reject;
|
|
* RFC3579 Sect. 2.6.2.
|
|
* Include EAP-Response/Nak with no preferred method if
|
|
* code == request.
|
|
* If code is not 1-4, discard the packet silently.
|
|
* Or is this already done by the EAP state machine? */
|
|
|
|
wpabuf_free(sess->eap_if->eapRespData);
|
|
sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
|
|
if (sess->eap_if->eapRespData == NULL)
|
|
os_free(eap);
|
|
eap = NULL;
|
|
sess->eap_if->eapResp = TRUE;
|
|
eap_server_sm_step(sess->eap);
|
|
|
|
if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
|
|
sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
|
|
RADIUS_DUMP("EAP data from the state machine",
|
|
wpabuf_head(sess->eap_if->eapReqData),
|
|
wpabuf_len(sess->eap_if->eapReqData));
|
|
} else if (sess->eap_if->eapFail) {
|
|
RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
|
|
"set");
|
|
} else if (eap_sm_method_pending(sess->eap)) {
|
|
if (sess->last_msg) {
|
|
radius_msg_free(sess->last_msg);
|
|
os_free(sess->last_msg);
|
|
}
|
|
sess->last_msg = msg;
|
|
sess->last_from_port = from_port;
|
|
os_free(sess->last_from_addr);
|
|
sess->last_from_addr = os_strdup(from_addr);
|
|
sess->last_fromlen = fromlen;
|
|
os_memcpy(&sess->last_from, from, fromlen);
|
|
return -2;
|
|
} else {
|
|
RADIUS_DEBUG("No EAP data from the state machine - ignore this"
|
|
" Access-Request silently (assuming it was a "
|
|
"duplicate)");
|
|
data->counters.packets_dropped++;
|
|
client->counters.packets_dropped++;
|
|
return -1;
|
|
}
|
|
|
|
reply = radius_server_encapsulate_eap(data, client, sess, msg);
|
|
|
|
if (reply) {
|
|
RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
|
|
if (wpa_debug_level <= MSG_MSGDUMP) {
|
|
radius_msg_dump(reply);
|
|
}
|
|
|
|
switch (reply->hdr->code) {
|
|
case RADIUS_CODE_ACCESS_ACCEPT:
|
|
data->counters.access_accepts++;
|
|
client->counters.access_accepts++;
|
|
break;
|
|
case RADIUS_CODE_ACCESS_REJECT:
|
|
data->counters.access_rejects++;
|
|
client->counters.access_rejects++;
|
|
break;
|
|
case RADIUS_CODE_ACCESS_CHALLENGE:
|
|
data->counters.access_challenges++;
|
|
client->counters.access_challenges++;
|
|
break;
|
|
}
|
|
res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
|
|
(struct sockaddr *) from, fromlen);
|
|
if (res < 0) {
|
|
perror("sendto[RADIUS SRV]");
|
|
}
|
|
if (sess->last_reply) {
|
|
radius_msg_free(sess->last_reply);
|
|
os_free(sess->last_reply);
|
|
}
|
|
sess->last_reply = reply;
|
|
sess->last_from_port = from_port;
|
|
sess->last_identifier = msg->hdr->identifier;
|
|
os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
|
|
16);
|
|
} else {
|
|
data->counters.packets_dropped++;
|
|
client->counters.packets_dropped++;
|
|
}
|
|
|
|
if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) {
|
|
RADIUS_DEBUG("Removing completed session 0x%x after timeout",
|
|
sess->sess_id);
|
|
eloop_cancel_timeout(radius_server_session_remove_timeout,
|
|
data, sess);
|
|
eloop_register_timeout(10, 0,
|
|
radius_server_session_remove_timeout,
|
|
data, sess);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void radius_server_receive_auth(int sock, void *eloop_ctx,
|
|
void *sock_ctx)
|
|
{
|
|
struct radius_server_data *data = eloop_ctx;
|
|
u8 *buf = NULL;
|
|
struct sockaddr_storage from;
|
|
socklen_t fromlen;
|
|
int len;
|
|
struct radius_client *client = NULL;
|
|
struct radius_msg *msg = NULL;
|
|
char abuf[50];
|
|
int from_port = 0;
|
|
|
|
buf = os_malloc(RADIUS_MAX_MSG_LEN);
|
|
if (buf == NULL) {
|
|
goto fail;
|
|
}
|
|
|
|
fromlen = sizeof(from);
|
|
len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
|
|
(struct sockaddr *) &from, &fromlen);
|
|
if (len < 0) {
|
|
perror("recvfrom[radius_server]");
|
|
goto fail;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6
|
|
if (data->ipv6) {
|
|
struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
|
|
if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
|
|
== NULL)
|
|
abuf[0] = '\0';
|
|
from_port = ntohs(from6->sin6_port);
|
|
RADIUS_DEBUG("Received %d bytes from %s:%d",
|
|
len, abuf, from_port);
|
|
|
|
client = radius_server_get_client(data,
|
|
(struct in_addr *)
|
|
&from6->sin6_addr, 1);
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
if (!data->ipv6) {
|
|
struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
|
|
os_strlcpy(abuf, inet_ntoa(from4->sin_addr), sizeof(abuf));
|
|
from_port = ntohs(from4->sin_port);
|
|
RADIUS_DEBUG("Received %d bytes from %s:%d",
|
|
len, abuf, from_port);
|
|
|
|
client = radius_server_get_client(data, &from4->sin_addr, 0);
|
|
}
|
|
|
|
RADIUS_DUMP("Received data", buf, len);
|
|
|
|
if (client == NULL) {
|
|
RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
|
|
data->counters.invalid_requests++;
|
|
goto fail;
|
|
}
|
|
|
|
msg = radius_msg_parse(buf, len);
|
|
if (msg == NULL) {
|
|
RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
|
|
data->counters.malformed_access_requests++;
|
|
client->counters.malformed_access_requests++;
|
|
goto fail;
|
|
}
|
|
|
|
os_free(buf);
|
|
buf = NULL;
|
|
|
|
if (wpa_debug_level <= MSG_MSGDUMP) {
|
|
radius_msg_dump(msg);
|
|
}
|
|
|
|
if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
|
|
RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
|
|
data->counters.unknown_types++;
|
|
client->counters.unknown_types++;
|
|
goto fail;
|
|
}
|
|
|
|
data->counters.access_requests++;
|
|
client->counters.access_requests++;
|
|
|
|
if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
|
|
client->shared_secret_len, NULL)) {
|
|
RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
|
|
data->counters.bad_authenticators++;
|
|
client->counters.bad_authenticators++;
|
|
goto fail;
|
|
}
|
|
|
|
if (radius_server_request(data, msg, (struct sockaddr *) &from,
|
|
fromlen, client, abuf, from_port, NULL) ==
|
|
-2)
|
|
return; /* msg was stored with the session */
|
|
|
|
fail:
|
|
if (msg) {
|
|
radius_msg_free(msg);
|
|
os_free(msg);
|
|
}
|
|
os_free(buf);
|
|
}
|
|
|
|
|
|
static int radius_server_open_socket(int port)
|
|
{
|
|
int s;
|
|
struct sockaddr_in addr;
|
|
|
|
s = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
perror("socket");
|
|
return -1;
|
|
}
|
|
|
|
os_memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(port);
|
|
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
|
|
perror("bind");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_IPV6
|
|
static int radius_server_open_socket6(int port)
|
|
{
|
|
int s;
|
|
struct sockaddr_in6 addr;
|
|
|
|
s = socket(PF_INET6, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
perror("socket[IPv6]");
|
|
return -1;
|
|
}
|
|
|
|
os_memset(&addr, 0, sizeof(addr));
|
|
addr.sin6_family = AF_INET6;
|
|
os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
|
|
addr.sin6_port = htons(port);
|
|
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
|
|
perror("bind");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
|
|
static void radius_server_free_sessions(struct radius_server_data *data,
|
|
struct radius_session *sessions)
|
|
{
|
|
struct radius_session *session, *prev;
|
|
|
|
session = sessions;
|
|
while (session) {
|
|
prev = session;
|
|
session = session->next;
|
|
radius_server_session_free(data, prev);
|
|
}
|
|
}
|
|
|
|
|
|
static void radius_server_free_clients(struct radius_server_data *data,
|
|
struct radius_client *clients)
|
|
{
|
|
struct radius_client *client, *prev;
|
|
|
|
client = clients;
|
|
while (client) {
|
|
prev = client;
|
|
client = client->next;
|
|
|
|
radius_server_free_sessions(data, prev->sessions);
|
|
os_free(prev->shared_secret);
|
|
os_free(prev);
|
|
}
|
|
}
|
|
|
|
|
|
static struct radius_client *
|
|
radius_server_read_clients(const char *client_file, int ipv6)
|
|
{
|
|
FILE *f;
|
|
const int buf_size = 1024;
|
|
char *buf, *pos;
|
|
struct radius_client *clients, *tail, *entry;
|
|
int line = 0, mask, failed = 0, i;
|
|
struct in_addr addr;
|
|
#ifdef CONFIG_IPV6
|
|
struct in6_addr addr6;
|
|
#endif /* CONFIG_IPV6 */
|
|
unsigned int val;
|
|
|
|
f = fopen(client_file, "r");
|
|
if (f == NULL) {
|
|
RADIUS_ERROR("Could not open client file '%s'", client_file);
|
|
return NULL;
|
|
}
|
|
|
|
buf = os_malloc(buf_size);
|
|
if (buf == NULL) {
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
|
|
clients = tail = NULL;
|
|
while (fgets(buf, buf_size, f)) {
|
|
/* Configuration file format:
|
|
* 192.168.1.0/24 secret
|
|
* 192.168.1.2 secret
|
|
* fe80::211:22ff:fe33:4455/64 secretipv6
|
|
*/
|
|
line++;
|
|
buf[buf_size - 1] = '\0';
|
|
pos = buf;
|
|
while (*pos != '\0' && *pos != '\n')
|
|
pos++;
|
|
if (*pos == '\n')
|
|
*pos = '\0';
|
|
if (*buf == '\0' || *buf == '#')
|
|
continue;
|
|
|
|
pos = buf;
|
|
while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
|
|
(*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
|
|
(*pos >= 'A' && *pos <= 'F')) {
|
|
pos++;
|
|
}
|
|
|
|
if (*pos == '\0') {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
|
|
if (*pos == '/') {
|
|
char *end;
|
|
*pos++ = '\0';
|
|
mask = strtol(pos, &end, 10);
|
|
if ((pos == end) ||
|
|
(mask < 0 || mask > (ipv6 ? 128 : 32))) {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
pos = end;
|
|
} else {
|
|
mask = ipv6 ? 128 : 32;
|
|
*pos++ = '\0';
|
|
}
|
|
|
|
if (!ipv6 && inet_aton(buf, &addr) == 0) {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
#ifdef CONFIG_IPV6
|
|
if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
|
|
if (inet_pton(AF_INET, buf, &addr) <= 0) {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
/* Convert IPv4 address to IPv6 */
|
|
if (mask <= 32)
|
|
mask += (128 - 32);
|
|
os_memset(addr6.s6_addr, 0, 10);
|
|
addr6.s6_addr[10] = 0xff;
|
|
addr6.s6_addr[11] = 0xff;
|
|
os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr,
|
|
4);
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
while (*pos == ' ' || *pos == '\t') {
|
|
pos++;
|
|
}
|
|
|
|
if (*pos == '\0') {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
|
|
entry = os_zalloc(sizeof(*entry));
|
|
if (entry == NULL) {
|
|
failed = 1;
|
|
break;
|
|
}
|
|
entry->shared_secret = os_strdup(pos);
|
|
if (entry->shared_secret == NULL) {
|
|
failed = 1;
|
|
os_free(entry);
|
|
break;
|
|
}
|
|
entry->shared_secret_len = os_strlen(entry->shared_secret);
|
|
entry->addr.s_addr = addr.s_addr;
|
|
if (!ipv6) {
|
|
val = 0;
|
|
for (i = 0; i < mask; i++)
|
|
val |= 1 << (31 - i);
|
|
entry->mask.s_addr = htonl(val);
|
|
}
|
|
#ifdef CONFIG_IPV6
|
|
if (ipv6) {
|
|
int offset = mask / 8;
|
|
|
|
os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
|
|
os_memset(entry->mask6.s6_addr, 0xff, offset);
|
|
val = 0;
|
|
for (i = 0; i < (mask % 8); i++)
|
|
val |= 1 << (7 - i);
|
|
if (offset < 16)
|
|
entry->mask6.s6_addr[offset] = val;
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
if (tail == NULL) {
|
|
clients = tail = entry;
|
|
} else {
|
|
tail->next = entry;
|
|
tail = entry;
|
|
}
|
|
}
|
|
|
|
if (failed) {
|
|
RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
|
|
radius_server_free_clients(NULL, clients);
|
|
clients = NULL;
|
|
}
|
|
|
|
os_free(buf);
|
|
fclose(f);
|
|
|
|
return clients;
|
|
}
|
|
|
|
|
|
struct radius_server_data *
|
|
radius_server_init(struct radius_server_conf *conf)
|
|
{
|
|
struct radius_server_data *data;
|
|
|
|
#ifndef CONFIG_IPV6
|
|
if (conf->ipv6) {
|
|
fprintf(stderr, "RADIUS server compiled without IPv6 "
|
|
"support.\n");
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
data = os_zalloc(sizeof(*data));
|
|
if (data == NULL)
|
|
return NULL;
|
|
|
|
os_get_time(&data->start_time);
|
|
data->conf_ctx = conf->conf_ctx;
|
|
data->eap_sim_db_priv = conf->eap_sim_db_priv;
|
|
data->ssl_ctx = conf->ssl_ctx;
|
|
data->ipv6 = conf->ipv6;
|
|
if (conf->pac_opaque_encr_key) {
|
|
data->pac_opaque_encr_key = os_malloc(16);
|
|
os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key,
|
|
16);
|
|
}
|
|
if (conf->eap_fast_a_id)
|
|
data->eap_fast_a_id = os_strdup(conf->eap_fast_a_id);
|
|
data->get_eap_user = conf->get_eap_user;
|
|
data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
|
|
|
|
data->clients = radius_server_read_clients(conf->client_file,
|
|
conf->ipv6);
|
|
if (data->clients == NULL) {
|
|
printf("No RADIUS clients configured.\n");
|
|
radius_server_deinit(data);
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6
|
|
if (conf->ipv6)
|
|
data->auth_sock = radius_server_open_socket6(conf->auth_port);
|
|
else
|
|
#endif /* CONFIG_IPV6 */
|
|
data->auth_sock = radius_server_open_socket(conf->auth_port);
|
|
if (data->auth_sock < 0) {
|
|
printf("Failed to open UDP socket for RADIUS authentication "
|
|
"server\n");
|
|
radius_server_deinit(data);
|
|
return NULL;
|
|
}
|
|
if (eloop_register_read_sock(data->auth_sock,
|
|
radius_server_receive_auth,
|
|
data, NULL)) {
|
|
radius_server_deinit(data);
|
|
return NULL;
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
|
|
void radius_server_deinit(struct radius_server_data *data)
|
|
{
|
|
if (data == NULL)
|
|
return;
|
|
|
|
if (data->auth_sock >= 0) {
|
|
eloop_unregister_read_sock(data->auth_sock);
|
|
close(data->auth_sock);
|
|
}
|
|
|
|
radius_server_free_clients(data, data->clients);
|
|
|
|
os_free(data->pac_opaque_encr_key);
|
|
os_free(data->eap_fast_a_id);
|
|
os_free(data);
|
|
}
|
|
|
|
|
|
int radius_server_get_mib(struct radius_server_data *data, char *buf,
|
|
size_t buflen)
|
|
{
|
|
int ret, uptime;
|
|
unsigned int idx;
|
|
char *end, *pos;
|
|
struct os_time now;
|
|
struct radius_client *cli;
|
|
|
|
/* RFC 2619 - RADIUS Authentication Server MIB */
|
|
|
|
if (data == NULL || buflen == 0)
|
|
return 0;
|
|
|
|
pos = buf;
|
|
end = buf + buflen;
|
|
|
|
os_get_time(&now);
|
|
uptime = (now.sec - data->start_time.sec) * 100 +
|
|
((now.usec - data->start_time.usec) / 10000) % 100;
|
|
ret = os_snprintf(pos, end - pos,
|
|
"RADIUS-AUTH-SERVER-MIB\n"
|
|
"radiusAuthServIdent=hostapd\n"
|
|
"radiusAuthServUpTime=%d\n"
|
|
"radiusAuthServResetTime=0\n"
|
|
"radiusAuthServConfigReset=4\n",
|
|
uptime);
|
|
if (ret < 0 || ret >= end - pos) {
|
|
*pos = '\0';
|
|
return pos - buf;
|
|
}
|
|
pos += ret;
|
|
|
|
ret = os_snprintf(pos, end - pos,
|
|
"radiusAuthServTotalAccessRequests=%u\n"
|
|
"radiusAuthServTotalInvalidRequests=%u\n"
|
|
"radiusAuthServTotalDupAccessRequests=%u\n"
|
|
"radiusAuthServTotalAccessAccepts=%u\n"
|
|
"radiusAuthServTotalAccessRejects=%u\n"
|
|
"radiusAuthServTotalAccessChallenges=%u\n"
|
|
"radiusAuthServTotalMalformedAccessRequests=%u\n"
|
|
"radiusAuthServTotalBadAuthenticators=%u\n"
|
|
"radiusAuthServTotalPacketsDropped=%u\n"
|
|
"radiusAuthServTotalUnknownTypes=%u\n",
|
|
data->counters.access_requests,
|
|
data->counters.invalid_requests,
|
|
data->counters.dup_access_requests,
|
|
data->counters.access_accepts,
|
|
data->counters.access_rejects,
|
|
data->counters.access_challenges,
|
|
data->counters.malformed_access_requests,
|
|
data->counters.bad_authenticators,
|
|
data->counters.packets_dropped,
|
|
data->counters.unknown_types);
|
|
if (ret < 0 || ret >= end - pos) {
|
|
*pos = '\0';
|
|
return pos - buf;
|
|
}
|
|
pos += ret;
|
|
|
|
for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
|
|
char abuf[50], mbuf[50];
|
|
#ifdef CONFIG_IPV6
|
|
if (data->ipv6) {
|
|
if (inet_ntop(AF_INET6, &cli->addr6, abuf,
|
|
sizeof(abuf)) == NULL)
|
|
abuf[0] = '\0';
|
|
if (inet_ntop(AF_INET6, &cli->mask6, abuf,
|
|
sizeof(mbuf)) == NULL)
|
|
mbuf[0] = '\0';
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
if (!data->ipv6) {
|
|
os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf));
|
|
os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf));
|
|
}
|
|
|
|
ret = os_snprintf(pos, end - pos,
|
|
"radiusAuthClientIndex=%u\n"
|
|
"radiusAuthClientAddress=%s/%s\n"
|
|
"radiusAuthServAccessRequests=%u\n"
|
|
"radiusAuthServDupAccessRequests=%u\n"
|
|
"radiusAuthServAccessAccepts=%u\n"
|
|
"radiusAuthServAccessRejects=%u\n"
|
|
"radiusAuthServAccessChallenges=%u\n"
|
|
"radiusAuthServMalformedAccessRequests=%u\n"
|
|
"radiusAuthServBadAuthenticators=%u\n"
|
|
"radiusAuthServPacketsDropped=%u\n"
|
|
"radiusAuthServUnknownTypes=%u\n",
|
|
idx,
|
|
abuf, mbuf,
|
|
cli->counters.access_requests,
|
|
cli->counters.dup_access_requests,
|
|
cli->counters.access_accepts,
|
|
cli->counters.access_rejects,
|
|
cli->counters.access_challenges,
|
|
cli->counters.malformed_access_requests,
|
|
cli->counters.bad_authenticators,
|
|
cli->counters.packets_dropped,
|
|
cli->counters.unknown_types);
|
|
if (ret < 0 || ret >= end - pos) {
|
|
*pos = '\0';
|
|
return pos - buf;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
return pos - buf;
|
|
}
|
|
|
|
|
|
static int radius_server_get_eap_user(void *ctx, const u8 *identity,
|
|
size_t identity_len, int phase2,
|
|
struct eap_user *user)
|
|
{
|
|
struct radius_session *sess = ctx;
|
|
struct radius_server_data *data = sess->server;
|
|
|
|
return data->get_eap_user(data->conf_ctx, identity, identity_len,
|
|
phase2, user);
|
|
}
|
|
|
|
|
|
static struct eapol_callbacks radius_server_eapol_cb =
|
|
{
|
|
.get_eap_user = radius_server_get_eap_user,
|
|
};
|
|
|
|
|
|
void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
|
|
{
|
|
struct radius_client *cli;
|
|
struct radius_session *s, *sess = NULL;
|
|
struct radius_msg *msg;
|
|
|
|
if (data == NULL)
|
|
return;
|
|
|
|
for (cli = data->clients; cli; cli = cli->next) {
|
|
for (s = cli->sessions; s; s = s->next) {
|
|
if (s->eap == ctx && s->last_msg) {
|
|
sess = s;
|
|
break;
|
|
}
|
|
if (sess)
|
|
break;
|
|
}
|
|
if (sess)
|
|
break;
|
|
}
|
|
|
|
if (sess == NULL) {
|
|
RADIUS_DEBUG("No session matched callback ctx");
|
|
return;
|
|
}
|
|
|
|
msg = sess->last_msg;
|
|
sess->last_msg = NULL;
|
|
eap_sm_pending_cb(sess->eap);
|
|
if (radius_server_request(data, msg,
|
|
(struct sockaddr *) &sess->last_from,
|
|
sess->last_fromlen, cli,
|
|
sess->last_from_addr,
|
|
sess->last_from_port, sess) == -2)
|
|
return; /* msg was stored with the session */
|
|
|
|
radius_msg_free(msg);
|
|
os_free(msg);
|
|
}
|