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Use monotonic clock for last_sae_token_key_update

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Just the usual, with a new function os_reltime_initialized()
thrown in that checks whether time has ever been retrieved
(time can't be completely zero).

Signed-hostap: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-11-25 21:56:07 +01:00 committed by Jouni Malinen
parent 100298e896
commit fe52c210cf
3 changed files with 12 additions and 6 deletions
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2
src/ap/hostapd.h
View file

@ -241,7 +241,7 @@ struct hostapd_data {
#ifdef CONFIG_SAE
/** Key used for generating SAE anti-clogging tokens */
u8 sae_token_key[8];
os_time_t last_sae_token_key_update;
struct os_reltime last_sae_token_key_update;
#endif /* CONFIG_SAE */
};

10
src/ap/ieee802_11.c
View file

@ -411,17 +411,17 @@ static struct wpabuf * auth_build_token_req(struct hostapd_data *hapd,
{
struct wpabuf *buf;
u8 *token;
struct os_time t;
struct os_reltime now;
os_get_time(&t);
if (hapd->last_sae_token_key_update == 0 ||
t.sec > hapd->last_sae_token_key_update + 60) {
os_get_reltime(&now);
if (!os_reltime_initialized(&hapd->last_sae_token_key_update) ||
os_reltime_expired(&now, &hapd->last_sae_token_key_update, 60)) {
if (random_get_bytes(hapd->sae_token_key,
sizeof(hapd->sae_token_key)) < 0)
return NULL;
wpa_hexdump(MSG_DEBUG, "SAE: Updated token key",
hapd->sae_token_key, sizeof(hapd->sae_token_key));
hapd->last_sae_token_key_update = t.sec;
hapd->last_sae_token_key_update = now;
}
buf = wpabuf_alloc(SHA256_MAC_LEN);

6
src/utils/os.h
View file

@ -108,6 +108,12 @@ static inline int os_reltime_expired(struct os_reltime *now,
}
static inline int os_reltime_initialized(struct os_reltime *t)
{
return t->sec != 0 || t->usec != 0;
}
/**
* os_mktime - Convert broken-down time into seconds since 1970-01-01
* @year: Four digit year