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FT: Add FTIE, TIE[ReassocDeadline], TIE[KeyLifetime] to EAPOL-Key 3/4

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These are mandatory IEs to be included in the FT 4-Way Handshake
Message 3.
This commit is contained in:
Jouni Malinen 2010-04-10 21:42:54 +03:00
parent 48de343cd4
commit 86dfabb809
3 changed files with 51 additions and 8 deletions
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44
src/ap/wpa_auth.c
View file

@ -1633,10 +1633,12 @@ SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
return;
}
/* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, GTK[GN])
/* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
GTK[GN], IGTK, [FTIE], [TIE * 2])
*/
os_memset(rsc, 0, WPA_KEY_RSC_LEN);
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
/* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
wpa_ie = sm->wpa_auth->wpa_ie;
wpa_ie_len = sm->wpa_auth->wpa_ie_len;
if (sm->wpa == WPA_VERSION_WPA &&
@ -1669,8 +1671,10 @@ SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
if (gtk)
kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
kde_len += 2 + PMKID_LEN;
if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
kde_len += 300; /* FTIE + 2 * TIE */
}
#endif /* CONFIG_IEEE80211R */
kde = os_malloc(kde_len);
if (kde == NULL)
@ -1700,6 +1704,40 @@ SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
}
pos = ieee80211w_kde_add(sm, pos);
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
int res;
struct wpa_auth_config *conf;
conf = &sm->wpa_auth->conf;
res = wpa_write_ftie(conf, conf->r0_key_holder,
conf->r0_key_holder_len,
NULL, NULL, pos, kde + kde_len - pos,
NULL, 0);
if (res < 0) {
wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
"into EAPOL-Key Key Data");
os_free(kde);
return;
}
pos += res;
/* TIE[ReassociationDeadline] (TU) */
*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
*pos++ = 5;
*pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
WPA_PUT_LE32(pos, conf->reassociation_deadline);
pos += 4;
/* TIE[KeyLifetime] (seconds) */
*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
*pos++ = 5;
*pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
pos += 4;
}
#endif /* CONFIG_IEEE80211R */
wpa_send_eapol(sm->wpa_auth, sm,
(secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |

10
src/ap/wpa_auth_ft.c
View file

@ -97,11 +97,11 @@ int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
}
static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
size_t r0kh_id_len,
const u8 *anonce, const u8 *snonce,
u8 *buf, size_t len, const u8 *subelem,
size_t subelem_len)
int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
size_t r0kh_id_len,
const u8 *anonce, const u8 *snonce,
u8 *buf, size_t len, const u8 *subelem,
size_t subelem_len)
{
u8 *pos = buf, *ielen;
struct rsn_ftie *hdr;

5
src/ap/wpa_auth_i.h
View file

@ -214,6 +214,11 @@ void wpa_smk_m3(struct wpa_authenticator *wpa_auth,
#ifdef CONFIG_IEEE80211R
int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len);
int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
size_t r0kh_id_len,
const u8 *anonce, const u8 *snonce,
u8 *buf, size_t len, const u8 *subelem,
size_t subelem_len);
int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
struct wpa_ptk *ptk, size_t ptk_len);
struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void);