/*
* WPA Supplicant - RSN PMKSA cache
- * Copyright (c) 2004-2009, 2011-2012, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, 2011-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
#include "wpa_i.h"
#include "pmksa_cache.h"
-#if defined(IEEE8021X_EAPOL) && !defined(CONFIG_NO_WPA2)
+#if defined(IEEE8021X_EAPOL) && !defined(CONFIG_NO_WPA)
static const int pmksa_cache_max_entries = 32;
struct wpa_sm *sm; /* TODO: get rid of this reference(?) */
void (*free_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx,
- int replace);
+ enum pmksa_free_reason reason);
void *ctx;
};
static void _pmksa_cache_free_entry(struct rsn_pmksa_cache_entry *entry)
{
- os_free(entry);
+ bin_clear_free(entry, sizeof(*entry));
}
static void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
struct rsn_pmksa_cache_entry *entry,
- int replace)
+ enum pmksa_free_reason reason)
{
wpa_sm_remove_pmkid(pmksa->sm, entry->aa, entry->pmkid);
pmksa->pmksa_count--;
- pmksa->free_cb(entry, pmksa->ctx, replace);
+ pmksa->free_cb(entry, pmksa->ctx, reason);
_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;
+ struct os_reltime now;
- os_get_time(&now);
+ os_get_reltime(&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->aa));
- pmksa_cache_free_entry(pmksa, entry, 0);
+ pmksa_cache_free_entry(pmksa, entry, PMKSA_EXPIRE);
}
pmksa_cache_set_expiration(pmksa);
{
int sec;
struct rsn_pmksa_cache_entry *entry;
- struct os_time now;
+ struct os_reltime now;
eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);
eloop_cancel_timeout(pmksa_cache_reauth, pmksa, NULL);
if (pmksa->pmksa == NULL)
return;
- os_get_time(&now);
+ os_get_reltime(&now);
sec = pmksa->pmksa->expiration - now.sec;
if (sec < 0)
sec = 0;
* @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
* @pmk: The new pairwise master key
* @pmk_len: PMK length in bytes, usually PMK_LEN (32)
+ * @pmkid: Calculated PMKID
+ * @kck: Key confirmation key or %NULL if not yet derived
+ * @kck_len: KCK length in bytes
* @aa: Authenticator address
* @spa: Supplicant address
* @network_ctx: Network configuration context for this PMK
*/
struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
+ const u8 *pmkid, const u8 *kck, size_t kck_len,
const u8 *aa, const u8 *spa, void *network_ctx, int akmp)
{
struct rsn_pmksa_cache_entry *entry, *pos, *prev;
- struct os_time now;
+ struct os_reltime now;
- if (pmk_len > PMK_LEN)
+ if (pmk_len > PMK_LEN_MAX)
+ return NULL;
+
+ if (wpa_key_mgmt_suite_b(akmp) && !kck)
return NULL;
entry = os_zalloc(sizeof(*entry));
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);
+ if (pmkid)
+ os_memcpy(entry->pmkid, pmkid, PMKID_LEN);
+ else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
+ rsn_pmkid_suite_b_192(kck, kck_len, aa, spa, entry->pmkid);
+ else if (wpa_key_mgmt_suite_b(akmp))
+ rsn_pmkid_suite_b(kck, kck_len, aa, spa, entry->pmkid);
+ else
+ rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid,
+ wpa_key_mgmt_sha256(akmp));
+ os_get_reltime(&now);
entry->expiration = now.sec + pmksa->sm->dot11RSNAConfigPMKLifetime;
entry->reauth_time = now.sec + pmksa->sm->dot11RSNAConfigPMKLifetime *
pmksa->sm->dot11RSNAConfigPMKReauthThreshold / 100;
while (pos) {
if (os_memcmp(aa, pos->aa, ETH_ALEN) == 0) {
if (pos->pmk_len == pmk_len &&
- os_memcmp(pos->pmk, pmk, pmk_len) == 0 &&
- os_memcmp(pos->pmkid, entry->pmkid, PMKID_LEN) ==
- 0) {
+ os_memcmp_const(pos->pmk, pmk, pmk_len) == 0 &&
+ os_memcmp_const(pos->pmkid, entry->pmkid,
+ PMKID_LEN) == 0) {
wpa_printf(MSG_DEBUG, "WPA: reusing previous "
"PMKSA entry");
os_free(entry);
pmksa->pmksa = pos->next;
else
prev->next = pos->next;
- if (pos == pmksa->sm->cur_pmksa) {
- /* We are about to replace the current PMKSA
- * cache entry. This happens when the PMKSA
- * caching attempt fails, so we don't want to
- * force pmksa_cache_free_entry() to disconnect
- * at this point. Let's just make sure the old
- * PMKSA cache entry will not be used in the
- * future.
- */
- wpa_printf(MSG_DEBUG, "RSN: replacing current "
- "PMKSA entry");
- pmksa->sm->cur_pmksa = NULL;
- }
- wpa_printf(MSG_DEBUG, "RSN: Replace PMKSA entry for "
- "the current AP");
- pmksa_cache_free_entry(pmksa, pos, 1);
/*
* If OKC is used, there may be other PMKSA cache
* entries based on the same PMK. These needs to be
* flushed so that a new entry can be created based on
- * the new PMK.
+ * the new PMK. Only clear other entries if they have a
+ * matching PMK and this PMK has been used successfully
+ * with the current AP, i.e., if opportunistic flag has
+ * been cleared in wpa_supplicant_key_neg_complete().
*/
- pmksa_cache_flush(pmksa, network_ctx);
+ wpa_printf(MSG_DEBUG, "RSN: Replace PMKSA entry for "
+ "the current AP and any PMKSA cache entry "
+ "that was based on the old PMK");
+ if (!pos->opportunistic)
+ pmksa_cache_flush(pmksa, network_ctx, pos->pmk,
+ pos->pmk_len);
+ pmksa_cache_free_entry(pmksa, pos, PMKSA_REPLACE);
break;
}
prev = pos;
if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
/* Remove the oldest entry to make room for the new entry */
pos = pmksa->pmksa;
- pmksa->pmksa = pos->next;
- wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache "
- "entry (for " MACSTR ") to make room for new one",
- MAC2STR(pos->aa));
- pmksa_cache_free_entry(pmksa, pos, 0);
+
+ if (pos == pmksa->sm->cur_pmksa) {
+ /*
+ * Never remove the current PMKSA cache entry, since
+ * it's in use, and removing it triggers a needless
+ * deauthentication.
+ */
+ pos = pos->next;
+ pmksa->pmksa->next = pos ? pos->next : NULL;
+ } else
+ pmksa->pmksa = pos->next;
+
+ if (pos) {
+ wpa_printf(MSG_DEBUG, "RSN: removed the oldest idle "
+ "PMKSA cache entry (for " MACSTR ") to "
+ "make room for new one",
+ MAC2STR(pos->aa));
+ pmksa_cache_free_entry(pmksa, pos, PMKSA_FREE);
+ }
}
/* Add the new entry; order by expiration time */
* pmksa_cache_flush - Flush PMKSA cache entries for a specific network
* @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
* @network_ctx: Network configuration context or %NULL to flush all entries
+ * @pmk: PMK to match for or %NYLL to match all PMKs
+ * @pmk_len: PMK length
*/
-void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa, void *network_ctx)
+void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa, void *network_ctx,
+ const u8 *pmk, size_t pmk_len)
{
struct rsn_pmksa_cache_entry *entry, *prev = NULL, *tmp;
int removed = 0;
entry = pmksa->pmksa;
while (entry) {
- if (entry->network_ctx == network_ctx || network_ctx == NULL) {
+ if ((entry->network_ctx == network_ctx ||
+ network_ctx == NULL) &&
+ (pmk == NULL ||
+ (pmk_len == entry->pmk_len &&
+ os_memcmp(pmk, entry->pmk, pmk_len) == 0))) {
wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry "
"for " MACSTR, MAC2STR(entry->aa));
if (prev)
pmksa->pmksa = entry->next;
tmp = entry;
entry = entry->next;
- pmksa_cache_free_entry(pmksa, tmp, 0);
+ pmksa_cache_free_entry(pmksa, tmp, PMKSA_FREE);
removed++;
} else {
prev = entry;
struct rsn_pmksa_cache_entry *new_entry;
new_entry = pmksa_cache_add(pmksa, old_entry->pmk, old_entry->pmk_len,
+ NULL, NULL, 0,
aa, pmksa->sm->own_addr,
old_entry->network_ctx, old_entry->akmp);
if (new_entry == NULL)
int i, ret;
char *pos = buf;
struct rsn_pmksa_cache_entry *entry;
- struct os_time now;
+ struct os_reltime now;
- os_get_time(&now);
+ os_get_reltime(&now);
ret = os_snprintf(pos, buf + len - pos,
"Index / AA / PMKID / expiration (in seconds) / "
"opportunistic\n");
- if (ret < 0 || ret >= buf + len - pos)
+ if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
i = 0;
i++;
ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ",
i, MAC2STR(entry->aa));
- if (ret < 0 || ret >= buf + len - pos)
+ if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,
ret = os_snprintf(pos, buf + len - pos, " %d %d\n",
(int) (entry->expiration - now.sec),
entry->opportunistic);
- if (ret < 0 || ret >= buf + len - pos)
+ if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
entry = entry->next;
*/
struct rsn_pmksa_cache *
pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,
- void *ctx, int replace),
+ void *ctx, enum pmksa_free_reason reason),
void *ctx, struct wpa_sm *sm)
{
struct rsn_pmksa_cache *pmksa;
return pmksa;
}
-#endif /* IEEE8021X_EAPOL and !CONFIG_NO_WPA2 */
+#endif /* IEEE8021X_EAPOL */
projects / mech_eap.git / blobdiff