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WPS: Fix debug prints in wps_derive_psk() error case

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Check for hmac_sha256() failures and exit from wps_derive_psk() without
printing out the derived keys if anything fails. This removes a valgrind
warning on uninitialized value when running the ap_wps_m3_oom test case.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2016-05-16 19:35:03 +03:00 committed by Jouni Malinen
parent 7d1007a674
commit aae125e2cf
4 changed files with 16 additions and 11 deletions
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13
src/wps/wps_common.c
View file

@ -129,23 +129,26 @@ int wps_derive_keys(struct wps_data *wps)
}
void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
int wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
size_t dev_passwd_len)
{
u8 hash[SHA256_MAC_LEN];
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
(dev_passwd_len + 1) / 2, hash);
if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
(dev_passwd_len + 1) / 2, hash) < 0)
return -1;
os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
dev_passwd + (dev_passwd_len + 1) / 2,
dev_passwd_len / 2, hash);
dev_passwd_len / 2, hash) < 0)
return -1;
os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
dev_passwd, dev_passwd_len);
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
return 0;
}

3
src/wps/wps_enrollee.c
View file

@ -173,7 +173,8 @@ static struct wpabuf * wps_build_m3(struct wps_data *wps)
wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
return NULL;
}
wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
if (wps_derive_psk(wps, wps->dev_password, wps->dev_password_len) < 0)
return NULL;
if (wps->wps->ap && random_pool_ready() != 1) {
wpa_printf(MSG_INFO,

2
src/wps/wps_i.h
View file

@ -132,7 +132,7 @@ struct wps_data {
void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
const char *label, u8 *res, size_t res_len);
int wps_derive_keys(struct wps_data *wps);
void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
int wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
size_t dev_passwd_len);
struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
size_t encr_len);

3
src/wps/wps_registrar.c
View file

@ -1928,7 +1928,8 @@ static struct wpabuf * wps_build_m4(struct wps_data *wps)
wpa_printf(MSG_DEBUG, "WPS: Building Message M4");
wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
if (wps_derive_psk(wps, wps->dev_password, wps->dev_password_len) < 0)
return NULL;
plain = wpabuf_alloc(200);
if (plain == NULL)