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EAP-pwd: Validate Prep field in EAP-pwd-ID/Response

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RFC 5931 Section 2.8.5.1 does not list the Prep field as something that
the server validates to match the Request. However, the supplicant side
has to use the same pre-processing mechanism for the password for the
authentication to work, so we may as well as enforce this field to match
the requested value now that wpa_supplicant implementation is fixed to
copy the value from the request.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2016-10-08 19:43:36 +03:00
parent 2875e32333
commit 53b2555f67
1 changed files with 3 additions and 1 deletions
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4
src/eap_server/eap_server_pwd.c
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@ -602,7 +602,9 @@ static void eap_pwd_process_id_resp(struct eap_sm *sm,
if ((data->group_num != be_to_host16(id->group_num)) ||
(id->random_function != EAP_PWD_DEFAULT_RAND_FUNC) ||
(os_memcmp(id->token, (u8 *)&data->token, sizeof(data->token))) ||
(id->prf != EAP_PWD_DEFAULT_PRF)) {
(id->prf != EAP_PWD_DEFAULT_PRF) ||
id->prep !=
data->password_hash ? EAP_PWD_PREP_MS : EAP_PWD_PREP_NONE) {
wpa_printf(MSG_INFO, "EAP-pwd: peer changed parameters");
eap_pwd_state(data, FAILURE);
return;