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EAP-FAST server: Piggyback Phase 2 start with end of Phase 1

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If Finished message from peer has been received before the server
Finished message, start Phase 2 with the same message to avoid extra
roundtrip when the peer does not have anything to send after the server
Finished message.
This commit is contained in:
Jouni Malinen 2009-12-20 11:39:45 +02:00
parent 1a1bf008cb
commit c479e41f53
1 changed files with 61 additions and 16 deletions
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75
src/eap_server/eap_fast.c
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@ -73,6 +73,10 @@ struct eap_fast_data {
};
static int eap_fast_process_phase2_start(struct eap_sm *sm,
struct eap_fast_data *data);
static const char * eap_fast_state_txt(int state)
{
switch (state) {
@ -804,11 +808,48 @@ static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
}
static int eap_fast_encrypt_phase2(struct eap_sm *sm,
struct eap_fast_data *data,
struct wpabuf *plain, int piggyback)
{
struct wpabuf *encr;
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
plain);
encr = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_mhead(plain),
wpabuf_len(plain));
wpabuf_free(plain);
if (data->ssl.out_buf && piggyback) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
"(len=%d) with last Phase 1 Message (len=%d "
"used=%d)",
(int) wpabuf_len(encr),
(int) wpabuf_len(data->ssl.out_buf),
(int) data->ssl.out_used);
if (wpabuf_resize(&data->ssl.out_buf, wpabuf_len(encr)) < 0) {
wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
"output buffer");
wpabuf_free(encr);
return -1;
}
wpabuf_put_buf(data->ssl.out_buf, encr);
wpabuf_free(encr);
} else {
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = encr;
}
return 0;
}
static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_fast_data *data = priv;
struct wpabuf *req = NULL;
struct wpabuf *encr;
int piggyback = 0;
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
@ -827,6 +868,19 @@ static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
if (eap_fast_phase1_done(sm, data) < 0)
return NULL;
if (data->state == PHASE2_START) {
/*
* Try to generate Phase 2 data to piggyback
* with the end of Phase 1 to avoid extra
* roundtrip.
*/
wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
"Phase 2");
if (eap_fast_process_phase2_start(sm, data))
break;
req = eap_fast_build_phase2_req(sm, data, id);
piggyback = 1;
}
}
break;
case PHASE2_ID:
@ -856,18 +910,9 @@ static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
return NULL;
}
if (req) {
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 "
"TLVs", req);
encr = eap_server_tls_encrypt(sm, &data->ssl,
wpabuf_mhead(req),
wpabuf_len(req));
wpabuf_free(req);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = encr;
}
if (req &&
eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
return NULL;
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
data->fast_version, id);
@ -1443,7 +1488,7 @@ static int eap_fast_process_phase1(struct eap_sm *sm,
}
static void eap_fast_process_phase2_start(struct eap_sm *sm,
static int eap_fast_process_phase2_start(struct eap_sm *sm,
struct eap_fast_data *data)
{
u8 next_type;
@ -1474,7 +1519,7 @@ static void eap_fast_process_phase2_start(struct eap_sm *sm,
next_type = EAP_TYPE_IDENTITY;
}
eap_fast_phase2_init(sm, data, next_type);
return eap_fast_phase2_init(sm, data, next_type);
}