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https://github.com/vanhoefm/fragattacks.git
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EAP-FAST: Divided eap_fast_process() into number of helper functions
This commit is contained in:
Jouni Malinen
parent
7f4c1d4300
commit
cdd1bc9288
@ -1323,6 +1323,119 @@ static void eap_fast_process_phase2(struct eap_sm *sm,
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}
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static int eap_fast_process_version(struct eap_fast_data *data,
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int peer_version)
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{
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data->peer_version = peer_version;
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if (data->force_version >= 0 && peer_version != data->force_version) {
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wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
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" version (forced=%d peer=%d) - reject",
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data->force_version, peer_version);
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eap_fast_state(data, FAILURE);
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return -1;
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}
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if (peer_version < data->fast_version) {
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wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
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"use version %d",
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peer_version, data->fast_version, peer_version);
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data->fast_version = peer_version;
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}
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return 0;
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}
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static int eap_fast_process_length(struct eap_fast_data *data,
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const u8 **pos, size_t *left)
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{
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u32 tls_msg_len;
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if (*left < 4) {
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wpa_printf(MSG_INFO, "EAP-FAST: Short frame with TLS "
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"length");
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eap_fast_state(data, FAILURE);
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return -1;
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}
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tls_msg_len = WPA_GET_BE32(*pos);
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wpa_printf(MSG_DEBUG, "EAP-FAST: TLS Message Length: %d",
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tls_msg_len);
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if (data->ssl.tls_in_left == 0) {
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data->ssl.tls_in_total = tls_msg_len;
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data->ssl.tls_in_left = tls_msg_len;
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os_free(data->ssl.tls_in);
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data->ssl.tls_in = NULL;
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data->ssl.tls_in_len = 0;
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}
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*pos += 4;
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*left -= 4;
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return 0;
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}
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static int eap_fast_process_phase1(struct eap_sm *sm,
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struct eap_fast_data *data,
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const u8 *pos, size_t left)
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{
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if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
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wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
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eap_fast_state(data, FAILURE);
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return -1;
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}
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if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
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data->ssl.tls_out_len > 0)
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return 1;
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/*
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* Phase 1 was completed with the received message (e.g., when using
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* abbreviated handshake), so Phase 2 can be started immediately
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* without having to send through an empty message to the peer.
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*/
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return eap_fast_phase1_done(sm, data);
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}
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static void eap_fast_process_phase2_start(struct eap_sm *sm,
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struct eap_fast_data *data)
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{
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u8 next_type;
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if (data->identity) {
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os_free(sm->identity);
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sm->identity = data->identity;
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data->identity = NULL;
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sm->identity_len = data->identity_len;
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data->identity_len = 0;
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if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
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"Phase2 Identity not found "
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"in the user database",
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sm->identity, sm->identity_len);
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next_type = eap_fast_req_failure(sm, data);
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} else {
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wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
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"known - skip Phase 2 Identity Request");
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next_type = sm->user->methods[0].method;
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sm->user_eap_method_index = 1;
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}
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eap_fast_state(data, PHASE2_METHOD);
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} else {
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eap_fast_state(data, PHASE2_ID);
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next_type = EAP_TYPE_IDENTITY;
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}
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eap_fast_phase2_init(sm, data, next_type);
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}
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static void eap_fast_process(struct eap_sm *sm, void *priv,
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struct wpabuf *respData)
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{
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@ -1330,9 +1443,6 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
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const u8 *pos;
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u8 flags;
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size_t left;
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unsigned int tls_msg_len;
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int peer_version;
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u8 next_type;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData,
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&left);
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@ -1343,95 +1453,22 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
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wpa_printf(MSG_DEBUG, "EAP-FAST: Received packet(len=%lu) - "
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"Flags 0x%02x", (unsigned long) wpabuf_len(respData),
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flags);
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data->peer_version = peer_version = flags & EAP_PEAP_VERSION_MASK;
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if (data->force_version >= 0 && peer_version != data->force_version) {
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wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
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" version (forced=%d peer=%d) - reject",
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data->force_version, peer_version);
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eap_fast_state(data, FAILURE);
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if (eap_fast_process_version(data, flags & EAP_PEAP_VERSION_MASK))
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return;
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if ((flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) &&
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eap_fast_process_length(data, &pos, &left))
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return;
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}
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if (peer_version < data->fast_version) {
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wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
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"use version %d",
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peer_version, data->fast_version, peer_version);
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data->fast_version = peer_version;
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}
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if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
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if (left < 4) {
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wpa_printf(MSG_INFO, "EAP-FAST: Short frame with TLS "
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"length");
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eap_fast_state(data, FAILURE);
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return;
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}
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tls_msg_len = WPA_GET_BE32(pos);
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wpa_printf(MSG_DEBUG, "EAP-FAST: TLS Message Length: %d",
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tls_msg_len);
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if (data->ssl.tls_in_left == 0) {
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data->ssl.tls_in_total = tls_msg_len;
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data->ssl.tls_in_left = tls_msg_len;
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os_free(data->ssl.tls_in);
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data->ssl.tls_in = NULL;
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data->ssl.tls_in_len = 0;
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}
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pos += 4;
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left -= 4;
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}
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switch (data->state) {
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case PHASE1:
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if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) <
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0) {
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wpa_printf(MSG_INFO, "EAP-FAST: TLS processing "
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"failed");
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eap_fast_state(data, FAILURE);
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}
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if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
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data->ssl.tls_out_len > 0)
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break;
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/*
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* Phase 1 was completed with the received message (e.g., when
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* using abbreviated handshake), so Phase 2 can be started
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* immediately without having to send through an empty message
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* to the peer.
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*/
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if (eap_fast_phase1_done(sm, data) < 0)
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if (eap_fast_process_phase1(sm, data, pos, left))
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break;
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/* fall through to PHASE2_START */
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case PHASE2_START:
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if (data->identity) {
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os_free(sm->identity);
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sm->identity = data->identity;
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data->identity = NULL;
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sm->identity_len = data->identity_len;
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data->identity_len = 0;
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if (eap_user_get(sm, sm->identity, sm->identity_len, 1)
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!= 0) {
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
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"Phase2 Identity not found "
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"in the user database",
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sm->identity,
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sm->identity_len);
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next_type = eap_fast_req_failure(sm, data);
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} else {
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wpa_printf(MSG_DEBUG, "EAP-FAST: Identity "
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"already known - skip Phase 2 "
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"Identity Request");
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next_type = sm->user->methods[0].method;
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sm->user_eap_method_index = 1;
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}
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eap_fast_state(data, PHASE2_METHOD);
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} else {
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eap_fast_state(data, PHASE2_ID);
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next_type = EAP_TYPE_IDENTITY;
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}
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eap_fast_phase2_init(sm, data, next_type);
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eap_fast_process_phase2_start(sm, data);
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break;
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case PHASE2_ID:
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case PHASE2_METHOD:
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