+++ /dev/null
-/*
- * hostapd - PMKSA cache for IEEE 802.11i RSN
- * Copyright (c) 2004-2008, 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 "utils/includes.h"
-
-#include "utils/common.h"
-#include "utils/eloop.h"
-#include "eapol_auth/eapol_auth_sm.h"
-#include "eapol_auth/eapol_auth_sm_i.h"
-#include "sta_info.h"
-#include "ap_config.h"
-#include "pmksa_cache_auth.h"
-
-
-static const int pmksa_cache_max_entries = 1024;
-static const int dot11RSNAConfigPMKLifetime = 43200;
-
-struct rsn_pmksa_cache {
-#define PMKID_HASH_SIZE 128
-#define PMKID_HASH(pmkid) (unsigned int) ((pmkid)[0] & 0x7f)
- struct rsn_pmksa_cache_entry *pmkid[PMKID_HASH_SIZE];
- struct rsn_pmksa_cache_entry *pmksa;
- int pmksa_count;
-
- void (*free_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx);
- void *ctx;
-};
-
-
-static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa);
-
-
-static void _pmksa_cache_free_entry(struct rsn_pmksa_cache_entry *entry)
-{
- if (entry == NULL)
- return;
- os_free(entry->identity);
-#ifndef CONFIG_NO_RADIUS
- radius_free_class(&entry->radius_class);
-#endif /* CONFIG_NO_RADIUS */
- os_free(entry);
-}
-
-
-static void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
- struct rsn_pmksa_cache_entry *entry)
-{
- struct rsn_pmksa_cache_entry *pos, *prev;
-
- pmksa->pmksa_count--;
- pmksa->free_cb(entry, pmksa->ctx);
- pos = pmksa->pmkid[PMKID_HASH(entry->pmkid)];
- prev = NULL;
- while (pos) {
- if (pos == entry) {
- if (prev != NULL) {
- prev->hnext = pos->hnext;
- } else {
- pmksa->pmkid[PMKID_HASH(entry->pmkid)] =
- pos->hnext;
- }
- break;
- }
- prev = pos;
- pos = pos->hnext;
- }
-
- pos = pmksa->pmksa;
- prev = NULL;
- while (pos) {
- if (pos == entry) {
- if (prev != NULL)
- prev->next = pos->next;
- else
- pmksa->pmksa = pos->next;
- break;
- }
- prev = pos;
- pos = pos->next;
- }
- _pmksa_cache_free_entry(entry);
-}
-
-
-static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)
-{
- struct rsn_pmksa_cache *pmksa = eloop_ctx;
- struct os_time now;
-
- os_get_time(&now);
- while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) {
- struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;
- pmksa->pmksa = entry->next;
- wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for "
- MACSTR, MAC2STR(entry->spa));
- pmksa_cache_free_entry(pmksa, entry);
- }
-
- pmksa_cache_set_expiration(pmksa);
-}
-
-
-static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)
-{
- int sec;
- struct os_time now;
-
- eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);
- if (pmksa->pmksa == NULL)
- return;
- os_get_time(&now);
- sec = pmksa->pmksa->expiration - now.sec;
- if (sec < 0)
- sec = 0;
- eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL);
-}
-
-
-static void pmksa_cache_from_eapol_data(struct rsn_pmksa_cache_entry *entry,
- struct eapol_state_machine *eapol)
-{
- if (eapol == NULL)
- return;
-
- if (eapol->identity) {
- entry->identity = os_malloc(eapol->identity_len);
- if (entry->identity) {
- entry->identity_len = eapol->identity_len;
- os_memcpy(entry->identity, eapol->identity,
- eapol->identity_len);
- }
- }
-
-#ifndef CONFIG_NO_RADIUS
- radius_copy_class(&entry->radius_class, &eapol->radius_class);
-#endif /* CONFIG_NO_RADIUS */
-
- entry->eap_type_authsrv = eapol->eap_type_authsrv;
- entry->vlan_id = ((struct sta_info *) eapol->sta)->vlan_id;
-}
-
-
-void pmksa_cache_to_eapol_data(struct rsn_pmksa_cache_entry *entry,
- struct eapol_state_machine *eapol)
-{
- if (entry == NULL || eapol == NULL)
- return;
-
- if (entry->identity) {
- os_free(eapol->identity);
- eapol->identity = os_malloc(entry->identity_len);
- if (eapol->identity) {
- eapol->identity_len = entry->identity_len;
- os_memcpy(eapol->identity, entry->identity,
- entry->identity_len);
- }
- wpa_hexdump_ascii(MSG_DEBUG, "STA identity from PMKSA",
- eapol->identity, eapol->identity_len);
- }
-
-#ifndef CONFIG_NO_RADIUS
- radius_free_class(&eapol->radius_class);
- radius_copy_class(&eapol->radius_class, &entry->radius_class);
-#endif /* CONFIG_NO_RADIUS */
- if (eapol->radius_class.attr) {
- wpa_printf(MSG_DEBUG, "Copied %lu Class attribute(s) from "
- "PMKSA", (unsigned long) eapol->radius_class.count);
- }
-
- eapol->eap_type_authsrv = entry->eap_type_authsrv;
- ((struct sta_info *) eapol->sta)->vlan_id = entry->vlan_id;
-}
-
-
-static void pmksa_cache_link_entry(struct rsn_pmksa_cache *pmksa,
- struct rsn_pmksa_cache_entry *entry)
-{
- struct rsn_pmksa_cache_entry *pos, *prev;
-
- /* Add the new entry; order by expiration time */
- pos = pmksa->pmksa;
- prev = NULL;
- while (pos) {
- if (pos->expiration > entry->expiration)
- break;
- prev = pos;
- pos = pos->next;
- }
- if (prev == NULL) {
- entry->next = pmksa->pmksa;
- pmksa->pmksa = entry;
- } else {
- entry->next = prev->next;
- prev->next = entry;
- }
- entry->hnext = pmksa->pmkid[PMKID_HASH(entry->pmkid)];
- pmksa->pmkid[PMKID_HASH(entry->pmkid)] = entry;
-
- pmksa->pmksa_count++;
- wpa_printf(MSG_DEBUG, "RSN: added PMKSA cache entry for " MACSTR,
- MAC2STR(entry->spa));
- wpa_hexdump(MSG_DEBUG, "RSN: added PMKID", entry->pmkid, PMKID_LEN);
-}
-
-
-/**
- * pmksa_cache_auth_add - Add a PMKSA cache entry
- * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
- * @pmk: The new pairwise master key
- * @pmk_len: PMK length in bytes, usually PMK_LEN (32)
- * @aa: Authenticator address
- * @spa: Supplicant address
- * @session_timeout: Session timeout
- * @eapol: Pointer to EAPOL state machine data
- * @akmp: WPA_KEY_MGMT_* used in key derivation
- * Returns: Pointer to the added PMKSA cache entry or %NULL on error
- *
- * This function create a PMKSA entry for a new PMK and adds it to the PMKSA
- * cache. If an old entry is already in the cache for the same Supplicant,
- * this entry will be replaced with the new entry. PMKID will be calculated
- * based on the PMK.
- */
-struct rsn_pmksa_cache_entry *
-pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
- const u8 *pmk, size_t pmk_len,
- const u8 *aa, const u8 *spa, int session_timeout,
- struct eapol_state_machine *eapol, int akmp)
-{
- struct rsn_pmksa_cache_entry *entry, *pos;
- struct os_time now;
-
- if (pmk_len > PMK_LEN)
- return NULL;
-
- entry = os_zalloc(sizeof(*entry));
- if (entry == NULL)
- return NULL;
- os_memcpy(entry->pmk, pmk, pmk_len);
- entry->pmk_len = pmk_len;
- rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid,
- wpa_key_mgmt_sha256(akmp));
- os_get_time(&now);
- entry->expiration = now.sec;
- if (session_timeout > 0)
- entry->expiration += session_timeout;
- else
- entry->expiration += dot11RSNAConfigPMKLifetime;
- entry->akmp = akmp;
- os_memcpy(entry->spa, spa, ETH_ALEN);
- pmksa_cache_from_eapol_data(entry, eapol);
-
- /* Replace an old entry for the same STA (if found) with the new entry
- */
- pos = pmksa_cache_auth_get(pmksa, spa, NULL);
- if (pos)
- pmksa_cache_free_entry(pmksa, pos);
-
- if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
- /* Remove the oldest entry to make room for the new entry */
- wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache "
- "entry (for " MACSTR ") to make room for new one",
- MAC2STR(pmksa->pmksa->spa));
- pmksa_cache_free_entry(pmksa, pmksa->pmksa);
- }
-
- pmksa_cache_link_entry(pmksa, entry);
-
- return entry;
-}
-
-
-struct rsn_pmksa_cache_entry *
-pmksa_cache_add_okc(struct rsn_pmksa_cache *pmksa,
- const struct rsn_pmksa_cache_entry *old_entry,
- const u8 *aa, const u8 *pmkid)
-{
- struct rsn_pmksa_cache_entry *entry;
-
- entry = os_zalloc(sizeof(*entry));
- if (entry == NULL)
- return NULL;
- os_memcpy(entry->pmkid, pmkid, PMKID_LEN);
- os_memcpy(entry->pmk, old_entry->pmk, old_entry->pmk_len);
- entry->pmk_len = old_entry->pmk_len;
- entry->expiration = old_entry->expiration;
- entry->akmp = old_entry->akmp;
- os_memcpy(entry->spa, old_entry->spa, ETH_ALEN);
- entry->opportunistic = 1;
- if (old_entry->identity) {
- entry->identity = os_malloc(old_entry->identity_len);
- if (entry->identity) {
- entry->identity_len = old_entry->identity_len;
- os_memcpy(entry->identity, old_entry->identity,
- old_entry->identity_len);
- }
- }
-#ifndef CONFIG_NO_RADIUS
- radius_copy_class(&entry->radius_class, &old_entry->radius_class);
-#endif /* CONFIG_NO_RADIUS */
- entry->eap_type_authsrv = old_entry->eap_type_authsrv;
- entry->vlan_id = old_entry->vlan_id;
- entry->opportunistic = 1;
-
- pmksa_cache_link_entry(pmksa, entry);
-
- return entry;
-}
-
-
-/**
- * pmksa_cache_auth_deinit - Free all entries in PMKSA cache
- * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
- */
-void pmksa_cache_auth_deinit(struct rsn_pmksa_cache *pmksa)
-{
- struct rsn_pmksa_cache_entry *entry, *prev;
- int i;
-
- if (pmksa == NULL)
- return;
-
- entry = pmksa->pmksa;
- while (entry) {
- prev = entry;
- entry = entry->next;
- _pmksa_cache_free_entry(prev);
- }
- eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);
- for (i = 0; i < PMKID_HASH_SIZE; i++)
- pmksa->pmkid[i] = NULL;
- os_free(pmksa);
-}
-
-
-/**
- * pmksa_cache_auth_get - Fetch a PMKSA cache entry
- * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
- * @spa: Supplicant address or %NULL to match any
- * @pmkid: PMKID or %NULL to match any
- * Returns: Pointer to PMKSA cache entry or %NULL if no match was found
- */
-struct rsn_pmksa_cache_entry *
-pmksa_cache_auth_get(struct rsn_pmksa_cache *pmksa,
- const u8 *spa, const u8 *pmkid)
-{
- struct rsn_pmksa_cache_entry *entry;
-
- if (pmkid)
- entry = pmksa->pmkid[PMKID_HASH(pmkid)];
- else
- entry = pmksa->pmksa;
- while (entry) {
- if ((spa == NULL ||
- os_memcmp(entry->spa, spa, ETH_ALEN) == 0) &&
- (pmkid == NULL ||
- os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0))
- return entry;
- entry = pmkid ? entry->hnext : entry->next;
- }
- return NULL;
-}
-
-
-/**
- * pmksa_cache_get_okc - Fetch a PMKSA cache entry using OKC
- * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
- * @aa: Authenticator address
- * @spa: Supplicant address
- * @pmkid: PMKID
- * Returns: Pointer to PMKSA cache entry or %NULL if no match was found
- *
- * Use opportunistic key caching (OKC) to find a PMK for a supplicant.
- */
-struct rsn_pmksa_cache_entry * pmksa_cache_get_okc(
- struct rsn_pmksa_cache *pmksa, const u8 *aa, const u8 *spa,
- const u8 *pmkid)
-{
- struct rsn_pmksa_cache_entry *entry;
- u8 new_pmkid[PMKID_LEN];
-
- entry = pmksa->pmksa;
- while (entry) {
- if (os_memcmp(entry->spa, spa, ETH_ALEN) != 0)
- continue;
- rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa, new_pmkid,
- wpa_key_mgmt_sha256(entry->akmp));
- if (os_memcmp(new_pmkid, pmkid, PMKID_LEN) == 0)
- return entry;
- entry = entry->next;
- }
- return NULL;
-}
-
-
-/**
- * pmksa_cache_auth_init - Initialize PMKSA cache
- * @free_cb: Callback function to be called when a PMKSA cache entry is freed
- * @ctx: Context pointer for free_cb function
- * Returns: Pointer to PMKSA cache data or %NULL on failure
- */
-struct rsn_pmksa_cache *
-pmksa_cache_auth_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,
- void *ctx), void *ctx)
-{
- struct rsn_pmksa_cache *pmksa;
-
- pmksa = os_zalloc(sizeof(*pmksa));
- if (pmksa) {
- pmksa->free_cb = free_cb;
- pmksa->ctx = ctx;
- }
-
- return pmksa;
-}
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