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Check EAP-AKA' AT_KDF duplication only if KDF was negotiated

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This fixes an issue where two AKA'/Challenge messages are received when
resynchronizing SEQ#. Previously, this used to trigger an authentication
failure since the second Challenge message did not duplicate AT_KDF.
This commit is contained in:
Jouni Malinen 2009-02-15 10:28:55 +02:00
parent 3fe430b5d5
commit 2cfcd014f4
1 changed files with 4 additions and 1 deletions
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5
src/eap_peer/eap_aka.c
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@ -60,6 +60,7 @@ struct eap_aka_data {
u8 *network_name; u8 *network_name;
size_t network_name_len; size_t network_name_len;
u16 kdf; u16 kdf;
int kdf_negotiation;
}; };
@ -665,6 +666,7 @@ static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
{ {
struct eap_sim_msg *msg; struct eap_sim_msg *msg;
data->kdf_negotiation = 1;
data->kdf = kdf; data->kdf = kdf;
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF " wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
"select)", id); "select)", id);
@ -704,7 +706,7 @@ static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
/* The only allowed (and required) duplication of a KDF is the addition /* The only allowed (and required) duplication of a KDF is the addition
* of the selected KDF into the beginning of the list. */ * of the selected KDF into the beginning of the list. */
if (data->kdf) { if (data->kdf_negotiation) {
if (attr->kdf[0] != data->kdf) { if (attr->kdf[0] != data->kdf) {
wpa_printf(MSG_WARNING, "EAP-AKA': The server did not " wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
"accept the selected KDF"); "accept the selected KDF");
@ -1251,6 +1253,7 @@ static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
wpabuf_free(data->id_msgs); wpabuf_free(data->id_msgs);
data->id_msgs = NULL; data->id_msgs = NULL;
data->use_result_ind = 0; data->use_result_ind = 0;
data->kdf_negotiation = 0;
} }