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EAP-TTLS server: Add support for session resumption

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This allows TLS session resumption to be used to enable abbreviated
handshake and skipping of Phase 2.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-08-23 22:07:47 +03:00
parent 8bb5b875d1
commit b6f2ae3b5b
1 changed files with 90 additions and 1 deletions
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91
src/eap_server/eap_server_ttls.c
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@ -71,6 +71,36 @@ static void eap_ttls_state(struct eap_ttls_data *data, int state)
eap_ttls_state_txt(data->state),
eap_ttls_state_txt(state));
data->state = state;
if (state == FAILURE)
tls_connection_remove_session(data->ssl.conn);
}
static void eap_ttls_valid_session(struct eap_sm *sm,
struct eap_ttls_data *data)
{
struct wpabuf *buf;
if (!sm->tls_session_lifetime)
return;
buf = wpabuf_alloc(1 + 1 + sm->identity_len);
if (!buf)
return;
wpabuf_put_u8(buf, EAP_TYPE_TTLS);
if (sm->identity) {
u8 id_len;
if (sm->identity_len <= 255)
id_len = sm->identity_len;
else
id_len = 255;
wpabuf_put_u8(buf, id_len);
wpabuf_put_data(buf, sm->identity, id_len);
} else {
wpabuf_put_u8(buf, 0);
}
tls_connection_set_success_data(data->ssl.conn, buf);
}
@ -518,6 +548,7 @@ static void eap_ttls_process_phase2_pap(struct eap_sm *sm,
wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: Correct user password");
eap_ttls_state(data, SUCCESS);
eap_ttls_valid_session(sm, data);
}
@ -576,6 +607,7 @@ static void eap_ttls_process_phase2_chap(struct eap_sm *sm,
0) {
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Correct user password");
eap_ttls_state(data, SUCCESS);
eap_ttls_valid_session(sm, data);
} else {
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Invalid user password");
eap_ttls_state(data, FAILURE);
@ -643,6 +675,7 @@ static void eap_ttls_process_phase2_mschap(struct eap_sm *sm,
if (os_memcmp_const(nt_response, response + 2 + 24, 24) == 0) {
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");
eap_ttls_state(data, SUCCESS);
eap_ttls_valid_session(sm, data);
} else {
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Invalid NT-Response");
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAP: Received",
@ -906,6 +939,7 @@ static void eap_ttls_process_phase2_eap_response(struct eap_sm *sm,
break;
case PHASE2_METHOD:
eap_ttls_state(data, SUCCESS);
eap_ttls_valid_session(sm, data);
break;
case FAILURE:
break;
@ -1129,6 +1163,7 @@ static void eap_ttls_process_msg(struct eap_sm *sm, void *priv,
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
"acknowledged response");
eap_ttls_state(data, SUCCESS);
eap_ttls_valid_session(sm, data);
} else if (!data->mschapv2_resp_ok) {
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
"acknowledged error");
@ -1155,10 +1190,64 @@ static void eap_ttls_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_ttls_data *data = priv;
const struct wpabuf *buf;
const u8 *pos;
u8 id_len;
if (eap_server_tls_process(sm, &data->ssl, respData, data,
EAP_TYPE_TTLS, eap_ttls_process_version,
eap_ttls_process_msg) < 0)
eap_ttls_process_msg) < 0) {
eap_ttls_state(data, FAILURE);
return;
}
if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
!tls_connection_resumed(sm->ssl_ctx, data->ssl.conn))
return;
buf = tls_connection_get_success_data(data->ssl.conn);
if (!buf || wpabuf_len(buf) < 1) {
wpa_printf(MSG_DEBUG,
"EAP-TTLS: No success data in resumed session - reject attempt");
eap_ttls_state(data, FAILURE);
return;
}
pos = wpabuf_head(buf);
if (*pos != EAP_TYPE_TTLS) {
wpa_printf(MSG_DEBUG,
"EAP-TTLS: Resumed session for another EAP type (%u) - reject attempt",
*pos);
eap_ttls_state(data, FAILURE);
return;
}
pos++;
id_len = *pos++;
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: Identity from cached session",
pos, id_len);
os_free(sm->identity);
sm->identity = os_malloc(id_len ? id_len : 1);
if (!sm->identity) {
sm->identity_len = 0;
eap_ttls_state(data, FAILURE);
return;
}
os_memcpy(sm->identity, pos, id_len);
sm->identity_len = id_len;
if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: Phase2 Identity not found in the user database",
sm->identity, sm->identity_len);
eap_ttls_state(data, FAILURE);
return;
}
wpa_printf(MSG_DEBUG,
"EAP-TTLS: Resuming previous session - skip Phase2");
eap_ttls_state(data, SUCCESS);
tls_connection_set_success_data_resumed(data->ssl.conn);
}