+++ /dev/null
-/*
- * RSN pre-authentication (supplicant)
- * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "wpa.h"
-#include "eloop.h"
-#include "l2_packet/l2_packet.h"
-#include "eapol_supp/eapol_supp_sm.h"
-#include "preauth.h"
-#include "pmksa_cache.h"
-#include "wpa_i.h"
-#include "common/ieee802_11_defs.h"
-
-
-#if defined(IEEE8021X_EAPOL) && !defined(CONFIG_NO_WPA2)
-
-#define PMKID_CANDIDATE_PRIO_SCAN 1000
-
-
-struct rsn_pmksa_candidate {
- struct dl_list list;
- u8 bssid[ETH_ALEN];
- int priority;
-};
-
-
-/**
- * pmksa_candidate_free - Free all entries in PMKSA candidate list
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- */
-void pmksa_candidate_free(struct wpa_sm *sm)
-{
- struct rsn_pmksa_candidate *entry, *n;
-
- if (sm == NULL)
- return;
-
- dl_list_for_each_safe(entry, n, &sm->pmksa_candidates,
- struct rsn_pmksa_candidate, list) {
- dl_list_del(&entry->list);
- os_free(entry);
- }
-}
-
-
-static void rsn_preauth_receive(void *ctx, const u8 *src_addr,
- const u8 *buf, size_t len)
-{
- struct wpa_sm *sm = ctx;
-
- wpa_printf(MSG_DEBUG, "RX pre-auth from " MACSTR, MAC2STR(src_addr));
- wpa_hexdump(MSG_MSGDUMP, "RX pre-auth", buf, len);
-
- if (sm->preauth_eapol == NULL ||
- is_zero_ether_addr(sm->preauth_bssid) ||
- os_memcmp(sm->preauth_bssid, src_addr, ETH_ALEN) != 0) {
- wpa_printf(MSG_WARNING, "RSN pre-auth frame received from "
- "unexpected source " MACSTR " - dropped",
- MAC2STR(src_addr));
- return;
- }
-
- eapol_sm_rx_eapol(sm->preauth_eapol, src_addr, buf, len);
-}
-
-
-static void rsn_preauth_eapol_cb(struct eapol_sm *eapol, int success,
- void *ctx)
-{
- struct wpa_sm *sm = ctx;
- u8 pmk[PMK_LEN];
-
- if (success) {
- int res, pmk_len;
- pmk_len = PMK_LEN;
- res = eapol_sm_get_key(eapol, pmk, PMK_LEN);
- if (res) {
- /*
- * EAP-LEAP is an exception from other EAP methods: it
- * uses only 16-byte PMK.
- */
- res = eapol_sm_get_key(eapol, pmk, 16);
- pmk_len = 16;
- }
- if (res == 0) {
- wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from pre-auth",
- pmk, pmk_len);
- sm->pmk_len = pmk_len;
- pmksa_cache_add(sm->pmksa, pmk, pmk_len,
- sm->preauth_bssid, sm->own_addr,
- sm->network_ctx,
- WPA_KEY_MGMT_IEEE8021X);
- } else {
- wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
- "RSN: failed to get master session key from "
- "pre-auth EAPOL state machines");
- success = 0;
- }
- }
-
- wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "RSN: pre-authentication with "
- MACSTR " %s", MAC2STR(sm->preauth_bssid),
- success ? "completed successfully" : "failed");
-
- rsn_preauth_deinit(sm);
- rsn_preauth_candidate_process(sm);
-}
-
-
-static void rsn_preauth_timeout(void *eloop_ctx, void *timeout_ctx)
-{
- struct wpa_sm *sm = eloop_ctx;
-
- wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "RSN: pre-authentication with "
- MACSTR " timed out", MAC2STR(sm->preauth_bssid));
- rsn_preauth_deinit(sm);
- rsn_preauth_candidate_process(sm);
-}
-
-
-static int rsn_preauth_eapol_send(void *ctx, int type, const u8 *buf,
- size_t len)
-{
- struct wpa_sm *sm = ctx;
- u8 *msg;
- size_t msglen;
- int res;
-
- /* TODO: could add l2_packet_sendmsg that allows fragments to avoid
- * extra copy here */
-
- if (sm->l2_preauth == NULL)
- return -1;
-
- msg = wpa_sm_alloc_eapol(sm, type, buf, len, &msglen, NULL);
- if (msg == NULL)
- return -1;
-
- wpa_hexdump(MSG_MSGDUMP, "TX EAPOL (preauth)", msg, msglen);
- res = l2_packet_send(sm->l2_preauth, sm->preauth_bssid,
- ETH_P_RSN_PREAUTH, msg, msglen);
- os_free(msg);
- return res;
-}
-
-
-/**
- * rsn_preauth_init - Start new RSN pre-authentication
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * @dst: Authenticator address (BSSID) with which to preauthenticate
- * @eap_conf: Current EAP configuration
- * Returns: 0 on success, -1 on another pre-authentication is in progress,
- * -2 on layer 2 packet initialization failure, -3 on EAPOL state machine
- * initialization failure, -4 on memory allocation failure
- *
- * This function request an RSN pre-authentication with a given destination
- * address. This is usually called for PMKSA candidates found from scan results
- * or from driver reports. In addition, ctrl_iface PREAUTH command can trigger
- * pre-authentication.
- */
-int rsn_preauth_init(struct wpa_sm *sm, const u8 *dst,
- struct eap_peer_config *eap_conf)
-{
- struct eapol_config eapol_conf;
- struct eapol_ctx *ctx;
-
- if (sm->preauth_eapol)
- return -1;
-
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
- "RSN: starting pre-authentication with " MACSTR, MAC2STR(dst));
-
- sm->l2_preauth = l2_packet_init(sm->ifname, sm->own_addr,
- ETH_P_RSN_PREAUTH,
- rsn_preauth_receive, sm, 0);
- if (sm->l2_preauth == NULL) {
- wpa_printf(MSG_WARNING, "RSN: Failed to initialize L2 packet "
- "processing for pre-authentication");
- return -2;
- }
-
- if (sm->bridge_ifname) {
- sm->l2_preauth_br = l2_packet_init(sm->bridge_ifname,
- sm->own_addr,
- ETH_P_RSN_PREAUTH,
- rsn_preauth_receive, sm, 0);
- if (sm->l2_preauth_br == NULL) {
- wpa_printf(MSG_WARNING, "RSN: Failed to initialize L2 "
- "packet processing (bridge) for "
- "pre-authentication");
- return -2;
- }
- }
-
- ctx = os_zalloc(sizeof(*ctx));
- if (ctx == NULL) {
- wpa_printf(MSG_WARNING, "Failed to allocate EAPOL context.");
- return -4;
- }
- ctx->ctx = sm->ctx->ctx;
- ctx->msg_ctx = sm->ctx->ctx;
- ctx->preauth = 1;
- ctx->cb = rsn_preauth_eapol_cb;
- ctx->cb_ctx = sm;
- ctx->scard_ctx = sm->scard_ctx;
- ctx->eapol_send = rsn_preauth_eapol_send;
- ctx->eapol_send_ctx = sm;
- ctx->set_config_blob = sm->ctx->set_config_blob;
- ctx->get_config_blob = sm->ctx->get_config_blob;
-
- sm->preauth_eapol = eapol_sm_init(ctx);
- if (sm->preauth_eapol == NULL) {
- os_free(ctx);
- wpa_printf(MSG_WARNING, "RSN: Failed to initialize EAPOL "
- "state machines for pre-authentication");
- return -3;
- }
- os_memset(&eapol_conf, 0, sizeof(eapol_conf));
- eapol_conf.accept_802_1x_keys = 0;
- eapol_conf.required_keys = 0;
- eapol_conf.fast_reauth = sm->fast_reauth;
- eapol_conf.workaround = sm->eap_workaround;
- eapol_sm_notify_config(sm->preauth_eapol, eap_conf, &eapol_conf);
- /*
- * Use a shorter startPeriod with preauthentication since the first
- * preauth EAPOL-Start frame may end up being dropped due to race
- * condition in the AP between the data receive and key configuration
- * after the 4-Way Handshake.
- */
- eapol_sm_configure(sm->preauth_eapol, -1, -1, 5, 6);
- os_memcpy(sm->preauth_bssid, dst, ETH_ALEN);
-
- eapol_sm_notify_portValid(sm->preauth_eapol, TRUE);
- /* 802.1X::portControl = Auto */
- eapol_sm_notify_portEnabled(sm->preauth_eapol, TRUE);
-
- eloop_register_timeout(sm->dot11RSNAConfigSATimeout, 0,
- rsn_preauth_timeout, sm, NULL);
-
- return 0;
-}
-
-
-/**
- * rsn_preauth_deinit - Abort RSN pre-authentication
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- *
- * This function aborts the current RSN pre-authentication (if one is started)
- * and frees resources allocated for it.
- */
-void rsn_preauth_deinit(struct wpa_sm *sm)
-{
- if (sm == NULL || !sm->preauth_eapol)
- return;
-
- eloop_cancel_timeout(rsn_preauth_timeout, sm, NULL);
- eapol_sm_deinit(sm->preauth_eapol);
- sm->preauth_eapol = NULL;
- os_memset(sm->preauth_bssid, 0, ETH_ALEN);
-
- l2_packet_deinit(sm->l2_preauth);
- sm->l2_preauth = NULL;
- if (sm->l2_preauth_br) {
- l2_packet_deinit(sm->l2_preauth_br);
- sm->l2_preauth_br = NULL;
- }
-}
-
-
-/**
- * rsn_preauth_candidate_process - Process PMKSA candidates
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- *
- * Go through the PMKSA candidates and start pre-authentication if a candidate
- * without an existing PMKSA cache entry is found. Processed candidates will be
- * removed from the list.
- */
-void rsn_preauth_candidate_process(struct wpa_sm *sm)
-{
- struct rsn_pmksa_candidate *candidate, *n;
-
- if (dl_list_empty(&sm->pmksa_candidates))
- return;
-
- /* TODO: drop priority for old candidate entries */
-
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: processing PMKSA candidate "
- "list");
- if (sm->preauth_eapol ||
- sm->proto != WPA_PROTO_RSN ||
- wpa_sm_get_state(sm) != WPA_COMPLETED ||
- (sm->key_mgmt != WPA_KEY_MGMT_IEEE8021X &&
- sm->key_mgmt != WPA_KEY_MGMT_IEEE8021X_SHA256)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: not in suitable "
- "state for new pre-authentication");
- return; /* invalid state for new pre-auth */
- }
-
- dl_list_for_each_safe(candidate, n, &sm->pmksa_candidates,
- struct rsn_pmksa_candidate, list) {
- struct rsn_pmksa_cache_entry *p = NULL;
- p = pmksa_cache_get(sm->pmksa, candidate->bssid, NULL);
- if (os_memcmp(sm->bssid, candidate->bssid, ETH_ALEN) != 0 &&
- (p == NULL || p->opportunistic)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA "
- "candidate " MACSTR
- " selected for pre-authentication",
- MAC2STR(candidate->bssid));
- dl_list_del(&candidate->list);
- rsn_preauth_init(sm, candidate->bssid,
- sm->eap_conf_ctx);
- os_free(candidate);
- return;
- }
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA candidate "
- MACSTR " does not need pre-authentication anymore",
- MAC2STR(candidate->bssid));
- /* Some drivers (e.g., NDIS) expect to get notified about the
- * PMKIDs again, so report the existing data now. */
- if (p) {
- wpa_sm_add_pmkid(sm, candidate->bssid, p->pmkid);
- }
-
- dl_list_del(&candidate->list);
- os_free(candidate);
- }
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: no more pending PMKSA "
- "candidates");
-}
-
-
-/**
- * pmksa_candidate_add - Add a new PMKSA candidate
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * @bssid: BSSID (authenticator address) of the candidate
- * @prio: Priority (the smaller number, the higher priority)
- * @preauth: Whether the candidate AP advertises support for pre-authentication
- *
- * This function is used to add PMKSA candidates for RSN pre-authentication. It
- * is called from scan result processing and from driver events for PMKSA
- * candidates, i.e., EVENT_PMKID_CANDIDATE events to wpa_supplicant_event().
- */
-void pmksa_candidate_add(struct wpa_sm *sm, const u8 *bssid,
- int prio, int preauth)
-{
- struct rsn_pmksa_candidate *cand, *pos;
-
- if (sm->network_ctx && sm->proactive_key_caching)
- pmksa_cache_get_opportunistic(sm->pmksa, sm->network_ctx,
- bssid);
-
- if (!preauth) {
- wpa_printf(MSG_DEBUG, "RSN: Ignored PMKID candidate without "
- "preauth flag");
- return;
- }
-
- /* If BSSID already on candidate list, update the priority of the old
- * entry. Do not override priority based on normal scan results. */
- cand = NULL;
- dl_list_for_each(pos, &sm->pmksa_candidates,
- struct rsn_pmksa_candidate, list) {
- if (os_memcmp(pos->bssid, bssid, ETH_ALEN) == 0) {
- cand = pos;
- break;
- }
- }
-
- if (cand) {
- dl_list_del(&cand->list);
- if (prio < PMKID_CANDIDATE_PRIO_SCAN)
- cand->priority = prio;
- } else {
- cand = os_zalloc(sizeof(*cand));
- if (cand == NULL)
- return;
- os_memcpy(cand->bssid, bssid, ETH_ALEN);
- cand->priority = prio;
- }
-
- /* Add candidate to the list; order by increasing priority value. i.e.,
- * highest priority (smallest value) first. */
- dl_list_for_each(pos, &sm->pmksa_candidates,
- struct rsn_pmksa_candidate, list) {
- if (cand->priority <= pos->priority) {
- dl_list_add(pos->list.prev, &cand->list);
- cand = NULL;
- break;
- }
- }
- if (cand)
- dl_list_add_tail(&sm->pmksa_candidates, &cand->list);
-
- wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: added PMKSA cache "
- "candidate " MACSTR " prio %d", MAC2STR(bssid), prio);
- rsn_preauth_candidate_process(sm);
-}
-
-
-/* TODO: schedule periodic scans if current AP supports preauth */
-
-/**
- * rsn_preauth_scan_results - Start processing scan results for canditates
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * Returns: 0 if ready to process results or -1 to skip processing
- *
- * This functions is used to notify RSN code about start of new scan results
- * processing. The actual scan results will be provided by calling
- * rsn_preauth_scan_result() for each BSS if this function returned 0.
- */
-int rsn_preauth_scan_results(struct wpa_sm *sm)
-{
- if (sm->ssid_len == 0)
- return -1;
-
- /*
- * TODO: is it ok to free all candidates? What about the entries
- * received from EVENT_PMKID_CANDIDATE?
- */
- pmksa_candidate_free(sm);
-
- return 0;
-}
-
-
-/**
- * rsn_preauth_scan_result - Processing scan result for PMKSA canditates
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- *
- * Add all suitable APs (Authenticators) from scan results into PMKSA
- * candidate list.
- */
-void rsn_preauth_scan_result(struct wpa_sm *sm, const u8 *bssid,
- const u8 *ssid, const u8 *rsn)
-{
- struct wpa_ie_data ie;
- struct rsn_pmksa_cache_entry *pmksa;
-
- if (ssid[1] != sm->ssid_len ||
- os_memcmp(ssid + 2, sm->ssid, sm->ssid_len) != 0)
- return; /* Not for the current SSID */
-
- if (os_memcmp(bssid, sm->bssid, ETH_ALEN) == 0)
- return; /* Ignore current AP */
-
- if (wpa_parse_wpa_ie(rsn, 2 + rsn[1], &ie))
- return;
-
- pmksa = pmksa_cache_get(sm->pmksa, bssid, NULL);
- if (pmksa && (!pmksa->opportunistic ||
- !(ie.capabilities & WPA_CAPABILITY_PREAUTH)))
- return;
-
- /* Give less priority to candidates found from normal scan results. */
- pmksa_candidate_add(sm, bssid, PMKID_CANDIDATE_PRIO_SCAN,
- ie.capabilities & WPA_CAPABILITY_PREAUTH);
-}
-
-
-#ifdef CONFIG_CTRL_IFACE
-/**
- * rsn_preauth_get_status - Get pre-authentication status
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * @buf: Buffer for status information
- * @buflen: Maximum buffer length
- * @verbose: Whether to include verbose status information
- * Returns: Number of bytes written to buf.
- *
- * Query WPA2 pre-authentication for status information. This function fills in
- * a text area with current status information. If the buffer (buf) is not
- * large enough, status information will be truncated to fit the buffer.
- */
-int rsn_preauth_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
- int verbose)
-{
- char *pos = buf, *end = buf + buflen;
- int res, ret;
-
- if (sm->preauth_eapol) {
- ret = os_snprintf(pos, end - pos, "Pre-authentication "
- "EAPOL state machines:\n");
- if (ret < 0 || ret >= end - pos)
- return pos - buf;
- pos += ret;
- res = eapol_sm_get_status(sm->preauth_eapol,
- pos, end - pos, verbose);
- if (res >= 0)
- pos += res;
- }
-
- return pos - buf;
-}
-#endif /* CONFIG_CTRL_IFACE */
-
-
-/**
- * rsn_preauth_in_progress - Verify whether pre-authentication is in progress
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- */
-int rsn_preauth_in_progress(struct wpa_sm *sm)
-{
- return sm->preauth_eapol != NULL;
-}
-
-#endif /* IEEE8021X_EAPOL and !CONFIG_NO_WPA2 */
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