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Split EAPOL-Key msg 3/4 Key Data validation into helper functions

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This commit is contained in:
Jouni Malinen 2010-04-10 21:55:29 +03:00
parent 86dfabb809
commit 5af8187e11
1 changed files with 75 additions and 41 deletions
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116
src/rsn_supp/wpa.c
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@ -790,6 +790,78 @@ static void wpa_report_ie_mismatch(struct wpa_sm *sm,
}
#ifdef CONFIG_IEEE80211R
static int ft_validate_mdie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
struct rsn_mdie *mdie;
/* TODO: verify that full MDIE matches with the one from scan
* results, not only mobility domain */
mdie = (struct rsn_mdie *) (ie->mdie + 2);
if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not "
"match with the current mobility domain");
return -1;
}
return 0;
}
static int ft_validate_rsnie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
struct wpa_ie_data rsn;
if (!ie->rsn_ie)
return 0;
/*
* Verify that PMKR1Name from EAPOL-Key message 3/4
* matches with the value we derived.
*/
if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 ||
rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
"FT 4-way handshake message 3/4");
return -1;
}
if (os_memcmp(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: PMKR1Name mismatch in "
"FT 4-way handshake message 3/4");
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator",
rsn.pmkid, WPA_PMK_NAME_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
return -1;
}
return 0;
}
static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
if (ft_validate_mdie(sm, src_addr, ie) < 0 ||
ft_validate_rsnie(sm, src_addr, ie) < 0)
return -1;
return 0;
}
#endif /* CONFIG_IEEE80211R */
static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
@ -841,19 +913,9 @@ static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
}
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt)) {
struct rsn_mdie *mdie;
/* TODO: verify that full MDIE matches with the one from scan
* results, not only mobility domain */
mdie = (struct rsn_mdie *) (ie->mdie + 2);
if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not "
"match with the current mobility domain");
return -1;
}
}
if (wpa_key_mgmt_ft(sm->key_mgmt) &&
wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0)
return -1;
#endif /* CONFIG_IEEE80211R */
return 0;
@ -954,34 +1016,6 @@ static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
goto failed;
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt) && ie.rsn_ie) {
struct wpa_ie_data rsn;
/*
* Verify that PMKR1Name from EAPOL-Key message 3/4 matches
* with the value we derived.
*/
if (wpa_parse_wpa_ie_rsn(ie.rsn_ie, ie.rsn_ie_len, &rsn) < 0 ||
rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
"FT 4-way handshake message 3/4");
return;
}
if (os_memcmp(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) !=
0) {
wpa_printf(MSG_DEBUG, "FT: PMKR1Name mismatch in "
"FT 4-way handshake message 3/4");
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
"Authenticator",
rsn.pmkid, WPA_PMK_NAME_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
return;
}
}
#endif /* CONFIG_IEEE80211R */
if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way "
"Handshake differs from 3 of 4-Way Handshake - drop"