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Redesigned EAP-TLS/PEAP/TTLS/FAST fragmentation/reassembly

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Fragmentation is now done as a separate step to clean up the design and to
allow the same code to be used in both Phase 1 and Phase 2. This adds
support for fragmenting EAP-PEAP/TTLS/FAST Phase 2 (tunneled) data.
This commit is contained in:
Jouni Malinen 2008-05-28 09:57:17 +03:00
parent ab17e3f2b7
commit 34f564dbd5
7 changed files with 469 additions and 607 deletions
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2
hostapd/ChangeLog
View file

@ -10,6 +10,8 @@ ChangeLog for hostapd
and IF-TNCCS interfaces from TNCS)
* added support for optional cryptobinding with PEAPv0
* added fragmentation support for EAP-TNC
* added support for fragmenting EAP-TTLS/PEAP/FAST Phase 2 (tunneled)
data
2008-02-22 - v0.6.3
* fixed Reassociation Response callback processing when using internal

173
src/eap_server/eap_fast.c
View file

@ -533,63 +533,6 @@ static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
}
static struct wpabuf * eap_fast_build_req(struct eap_sm *sm,
struct eap_fast_data *data, u8 id)
{
int res;
struct wpabuf *req;
res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_FAST,
data->fast_version, id, &req);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
if (eap_fast_phase1_done(sm, data) < 0) {
os_free(req);
return NULL;
}
}
if (res == 1)
return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
data->fast_version);
return req;
}
static struct wpabuf * eap_fast_encrypt(struct eap_sm *sm,
struct eap_fast_data *data,
u8 id, u8 *plain, size_t plain_len)
{
int res;
struct wpabuf *buf;
/* TODO: add support for fragmentation, if needed. This will need to
* add TLS Message Length field, if the frame is fragmented. */
buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
1 + data->ssl.tls_out_limit,
EAP_CODE_REQUEST, id);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, data->fast_version);
res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
plain, plain_len, wpabuf_put(buf, 0),
data->ssl.tls_out_limit);
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt Phase 2 "
"data");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
eap_update_len(buf);
return buf;
}
static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
struct eap_fast_data *data,
u8 id)
@ -827,16 +770,28 @@ static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_fast_data *data = priv;
struct wpabuf *req;
struct wpabuf *req = NULL;
struct wpabuf *encr;
if (data->state == START)
return eap_fast_build_start(sm, data, id);
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
data->fast_version);
}
if (data->state == PHASE1)
return eap_fast_build_req(sm, data, id);
if (data->ssl.state == WAIT_FRAG_ACK) {
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
data->fast_version, id);
}
switch (data->state) {
case START:
return eap_fast_build_start(sm, data, id);
case PHASE1:
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
if (eap_fast_phase1_done(sm, data) < 0)
return NULL;
}
break;
case PHASE2_ID:
case PHASE2_METHOD:
req = eap_fast_build_phase2_req(sm, data, id);
@ -864,16 +819,21 @@ static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
return NULL;
}
if (req == NULL)
return NULL;
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
req);
encr = eap_fast_encrypt(sm, data, id, wpabuf_mhead(req),
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);
return encr;
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = encr;
}
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
data->fast_version, id);
}
@ -1305,11 +1265,16 @@ static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
static void eap_fast_process_phase2(struct eap_sm *sm,
struct eap_fast_data *data,
const u8 *in_data, size_t in_len)
struct wpabuf *in_buf)
{
u8 *in_decrypted;
int len_decrypted, res;
int len_decrypted;
size_t buf_len;
u8 *in_data;
size_t in_len;
in_data = wpabuf_mhead(in_buf);
in_len = wpabuf_len(in_buf);
wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
" Phase 2", (unsigned long) in_len);
@ -1325,15 +1290,7 @@ static void eap_fast_process_phase2(struct eap_sm *sm,
return;
}
/* FIX: get rid of const -> non-const typecast */
res = eap_server_tls_data_reassemble(sm, &data->ssl, (u8 **) &in_data,
&in_len);
if (res < 0 || res == 1)
return;
buf_len = in_len;
if (data->ssl.tls_in_total > buf_len)
buf_len = data->ssl.tls_in_total;
/*
* Even though we try to disable TLS compression, it is possible that
* this cannot be done with all TLS libraries. Add extra buffer space
@ -1344,9 +1301,6 @@ static void eap_fast_process_phase2(struct eap_sm *sm,
buf_len *= 3;
in_decrypted = os_malloc(buf_len);
if (in_decrypted == NULL) {
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
"for decryption");
return;
@ -1355,9 +1309,6 @@ static void eap_fast_process_phase2(struct eap_sm *sm,
len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
in_data, in_len,
in_decrypted, buf_len);
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
if (len_decrypted < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
"data");
@ -1407,49 +1358,17 @@ static int eap_fast_process_version(struct eap_fast_data *data,
}
static int eap_fast_process_length(struct eap_fast_data *data,
const u8 **pos, size_t *left)
{
u32 tls_msg_len;
if (*left < 4) {
wpa_printf(MSG_INFO, "EAP-FAST: Short frame with TLS "
"length");
eap_fast_state(data, FAILURE);
return -1;
}
tls_msg_len = WPA_GET_BE32(*pos);
wpa_printf(MSG_DEBUG, "EAP-FAST: TLS Message Length: %d",
tls_msg_len);
if (data->ssl.tls_in_left == 0) {
data->ssl.tls_in_total = tls_msg_len;
data->ssl.tls_in_left = tls_msg_len;
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
}
*pos += 4;
*left -= 4;
return 0;
}
static int eap_fast_process_phase1(struct eap_sm *sm,
struct eap_fast_data *data,
const u8 *pos, size_t left)
struct eap_fast_data *data)
{
if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
eap_fast_state(data, FAILURE);
return -1;
}
if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
data->ssl.tls_out_len > 0)
wpabuf_len(data->ssl.out_buf) > 0)
return 1;
/*
@ -1504,6 +1423,7 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
const u8 *pos;
u8 flags;
size_t left;
int ret;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData,
&left);
@ -1518,13 +1438,16 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
if (eap_fast_process_version(data, flags & EAP_PEAP_VERSION_MASK))
return;
if ((flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) &&
eap_fast_process_length(data, &pos, &left))
ret = eap_server_tls_reassemble(&data->ssl, flags, &pos, &left);
if (ret < 0) {
eap_fast_state(data, FAILURE);
return;
} else if (ret == 1)
return;
switch (data->state) {
case PHASE1:
if (eap_fast_process_phase1(sm, data, pos, left))
if (eap_fast_process_phase1(sm, data))
break;
/* fall through to PHASE2_START */
@ -1535,7 +1458,7 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
case PHASE2_METHOD:
case CRYPTO_BINDING:
case REQUEST_PAC:
eap_fast_process_phase2(sm, data, pos, left);
eap_fast_process_phase2(sm, data, data->ssl.in_buf);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
@ -1548,6 +1471,8 @@ static void eap_fast_process(struct eap_sm *sm, void *priv,
"in TLS processing");
eap_fast_state(data, FAILURE);
}
eap_server_tls_free_in_buf(&data->ssl);
}

174
src/eap_server/eap_peap.c
View file

@ -230,64 +230,6 @@ static struct wpabuf * eap_peap_build_start(struct eap_sm *sm,
}
static struct wpabuf * eap_peap_build_req(struct eap_sm *sm,
struct eap_peap_data *data, u8 id)
{
int res;
struct wpabuf *req;
res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_PEAP,
data->peap_version, id, &req);
if (data->peap_version < 2 &&
tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, starting "
"Phase2");
eap_peap_state(data, PHASE2_START);
}
if (res == 1)
return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
data->peap_version);
return req;
}
static struct wpabuf * eap_peap_encrypt(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id, const u8 *plain,
size_t plain_len)
{
int res;
struct wpabuf *buf;
/* TODO: add support for fragmentation, if needed. This will need to
* add TLS Message Length field, if the frame is fragmented. */
buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP,
1 + data->ssl.tls_out_limit,
EAP_CODE_REQUEST, id);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, data->peap_version);
res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
plain, plain_len, wpabuf_put(buf, 0),
data->ssl.tls_out_limit);
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt Phase 2 "
"data");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
eap_update_len(buf);
return buf;
}
static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id)
@ -317,7 +259,7 @@ static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
req_len -= sizeof(struct eap_hdr);
}
encr_req = eap_peap_encrypt(sm, data, id, req, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
wpabuf_free(buf);
return encr_req;
@ -355,7 +297,7 @@ static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
req += sizeof(struct eap_hdr);
req_len -= sizeof(struct eap_hdr);
encr_req = eap_peap_encrypt(sm, data, id, req, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
wpabuf_free(buf);
return encr_req;
@ -577,7 +519,7 @@ static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
buf);
encr_req = eap_peap_encrypt(sm, data, id, wpabuf_head(buf),
encr_req = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_head(buf),
wpabuf_len(buf));
wpabuf_free(buf);
@ -605,7 +547,7 @@ static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
(u8 *) hdr, req_len);
encr_req = eap_peap_encrypt(sm, data, id, (u8 *) hdr, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, (u8 *) hdr, req_len);
os_free(hdr);
return encr_req;
@ -616,30 +558,66 @@ static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_peap_data *data = priv;
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
data->peap_version);
}
if (data->ssl.state == WAIT_FRAG_ACK) {
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
data->peap_version, id);
}
switch (data->state) {
case START:
return eap_peap_build_start(sm, data, id);
case PHASE1:
case PHASE1_ID2:
return eap_peap_build_req(sm, data, id);
if (data->peap_version < 2 &&
tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
"starting Phase2");
eap_peap_state(data, PHASE2_START);
}
break;
case PHASE2_ID:
case PHASE2_METHOD:
return eap_peap_build_phase2_req(sm, data, id);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_req(sm, data, id);
break;
#ifdef EAP_TNC
case PHASE2_SOH:
return eap_peap_build_phase2_soh(sm, data, id);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_soh(sm, data, id);
break;
#endif /* EAP_TNC */
case PHASE2_TLV:
return eap_peap_build_phase2_tlv(sm, data, id);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_tlv(sm, data, id);
break;
case SUCCESS_REQ:
return eap_peap_build_phase2_term(sm, data, id, 1);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
1);
break;
case FAILURE_REQ:
return eap_peap_build_phase2_term(sm, data, id, 0);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
0);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
__func__, data->state);
return NULL;
}
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
data->peap_version, id);
}
@ -1135,7 +1113,7 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
const u8 *in_data, size_t in_len)
{
struct wpabuf *in_decrypted;
int len_decrypted, res;
int len_decrypted;
const struct eap_hdr *hdr;
size_t buf_len, len;
@ -1152,15 +1130,7 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
return;
}
/* FIX: get rid of const -> non-const typecast */
res = eap_server_tls_data_reassemble(sm, &data->ssl, (u8 **) &in_data,
&in_len);
if (res < 0 || res == 1)
return;
buf_len = in_len;
if (data->ssl.tls_in_total > buf_len)
buf_len = data->ssl.tls_in_total;
/*
* Even though we try to disable TLS compression, it is possible that
* this cannot be done with all TLS libraries. Add extra buffer space
@ -1171,9 +1141,6 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
buf_len *= 3;
in_decrypted = wpabuf_alloc(buf_len);
if (in_decrypted == NULL) {
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
wpa_printf(MSG_WARNING, "EAP-PEAP: failed to allocate memory "
"for decryption");
return;
@ -1183,9 +1150,6 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
in_data, in_len,
wpabuf_mhead(in_decrypted),
buf_len);
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
if (len_decrypted < 0) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
"data");
@ -1315,7 +1279,6 @@ static int eap_peapv2_start_phase2(struct eap_sm *sm,
{
struct wpabuf *buf, *buf2;
int res;
u8 *tls_out;
wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Phase1 done, include first Phase2 "
"payload in the same message");
@ -1358,18 +1321,11 @@ static int eap_peapv2_start_phase2(struct eap_sm *sm,
buf);
/* Append TLS data into the pending buffer after the Server Finished */
tls_out = os_realloc(data->ssl.tls_out,
data->ssl.tls_out_len + wpabuf_len(buf));
if (tls_out == NULL) {
if (wpabuf_resize(&data->ssl.out_buf, wpabuf_len(buf)) < 0) {
wpabuf_free(buf);
return -1;
}
os_memcpy(tls_out + data->ssl.tls_out_len, wpabuf_head(buf),
wpabuf_len(buf));
data->ssl.tls_out = tls_out;
data->ssl.tls_out_len += wpabuf_len(buf);
wpabuf_put_buf(data->ssl.out_buf, buf);
wpabuf_free(buf);
return 0;
@ -1383,8 +1339,8 @@ static void eap_peap_process(struct eap_sm *sm, void *priv,
const u8 *pos;
u8 flags;
size_t left;
unsigned int tls_msg_len;
int peer_version;
int ret;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PEAP, respData,
&left);
@ -1409,33 +1365,17 @@ static void eap_peap_process(struct eap_sm *sm, void *priv,
peer_version, data->peap_version, peer_version);
data->peap_version = peer_version;
}
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
if (left < 4) {
wpa_printf(MSG_INFO, "EAP-PEAP: Short frame with TLS "
"length");
ret = eap_server_tls_reassemble(&data->ssl, flags, &pos, &left);
if (ret < 0) {
eap_peap_state(data, FAILURE);
return;
}
tls_msg_len = WPA_GET_BE32(pos);
wpa_printf(MSG_DEBUG, "EAP-PEAP: TLS Message Length: %d",
tls_msg_len);
if (data->ssl.tls_in_left == 0) {
data->ssl.tls_in_total = tls_msg_len;
data->ssl.tls_in_left = tls_msg_len;
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
}
pos += 4;
left -= 4;
}
} else if (ret == 1)
return;
switch (data->state) {
case PHASE1:
if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) <
0) {
wpa_printf(MSG_INFO, "EAP-PEAP: TLS processing "
"failed");
if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
eap_peap_state(data, FAILURE);
break;
}
@ -1476,6 +1416,8 @@ static void eap_peap_process(struct eap_sm *sm, void *priv,
"in TLS processing");
eap_peap_state(data, FAILURE);
}
eap_server_tls_free_in_buf(&data->ssl);
}

76
src/eap_server/eap_tls.c
View file

@ -1,6 +1,6 @@
/*
* hostapd / EAP-TLS (RFC 2716)
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -80,40 +80,36 @@ static struct wpabuf * eap_tls_build_start(struct eap_sm *sm,
}
static struct wpabuf * eap_tls_build_req(struct eap_sm *sm,
struct eap_tls_data *data, u8 id)
{
int res;
struct wpabuf *req;
res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TLS, 0,
id, &req);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
data->state = SUCCESS;
}
if (res == 1)
return eap_server_tls_build_ack(id, EAP_TYPE_TLS, 0);
return req;
}
static struct wpabuf * eap_tls_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_tls_data *data = priv;
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_TLS, 0);
}
if (data->ssl.state == WAIT_FRAG_ACK) {
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TLS, 0,
id);
}
switch (data->state) {
case START:
return eap_tls_build_start(sm, data, id);
case CONTINUE:
return eap_tls_build_req(sm, data, id);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
data->state = SUCCESS;
}
break;
default:
wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
__func__, data->state);
return NULL;
}
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TLS, 0, id);
}
@ -140,50 +136,34 @@ static void eap_tls_process(struct eap_sm *sm, void *priv,
const u8 *pos;
u8 flags;
size_t left;
unsigned int tls_msg_len;
int ret;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLS, respData, &left);
if (pos == NULL || left < 1)
return; /* Should not happen - frame already validated */
flags = *pos++;
left--;
wpa_printf(MSG_DEBUG, "EAP-TLS: Received packet(len=%lu) - "
"Flags 0x%02x", (unsigned long) wpabuf_len(respData),
flags);
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
if (left < 4) {
wpa_printf(MSG_INFO, "EAP-TLS: Short frame with TLS "
"length");
data->state = FAILURE;
return;
}
tls_msg_len = WPA_GET_BE32(pos);
wpa_printf(MSG_DEBUG, "EAP-TLS: TLS Message Length: %d",
tls_msg_len);
if (data->ssl.tls_in_left == 0) {
data->ssl.tls_in_total = tls_msg_len;
data->ssl.tls_in_left = tls_msg_len;
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
}
pos += 4;
left -= 4;
}
if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
wpa_printf(MSG_INFO, "EAP-TLS: TLS processing failed");
ret = eap_server_tls_reassemble(&data->ssl, flags, &pos, &left);
if (ret < 0) {
data->state = FAILURE;
return;
}
} else if (ret == 1)
return;
if (eap_server_tls_phase1(sm, &data->ssl) < 0)
data->state = FAILURE;
if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
wpa_printf(MSG_INFO, "EAP-TLS: Locally detected fatal error "
"in TLS processing");
data->state = FAILURE;
return;
}
eap_server_tls_free_in_buf(&data->ssl);
}

398
src/eap_server/eap_tls_common.c
View file

@ -1,6 +1,6 @@
/*
* hostapd / EAP-TLS/PEAP/TTLS/FAST common functions
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -58,8 +58,8 @@ int eap_server_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
void eap_server_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
{
tls_connection_deinit(sm->ssl_ctx, data->conn);
os_free(data->tls_in);
os_free(data->tls_out);
os_free(data->in_buf);
os_free(data->out_buf);
}
@ -106,176 +106,60 @@ fail:
}
int eap_server_tls_data_reassemble(struct eap_sm *sm,
struct eap_ssl_data *data,
u8 **in_data, size_t *in_len)
struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
int eap_type, int peap_version, u8 id)
{
u8 *buf;
if (data->tls_in_left > *in_len || data->tls_in) {
if (*in_len == 0) {
wpa_printf(MSG_INFO, "SSL: Empty fragment when trying "
"to reassemble");
return -1;
}
if (data->tls_in_len + *in_len > 65536) {
/* Limit length to avoid rogue peers from causing large
* memory allocations. */
os_free(data->tls_in);
data->tls_in = NULL;
data->tls_in_len = 0;
wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
" over 64 kB)");
return -1;
}
buf = os_realloc(data->tls_in, data->tls_in_len + *in_len);
if (buf == NULL) {
os_free(data->tls_in);
data->tls_in = NULL;
data->tls_in_len = 0;
wpa_printf(MSG_INFO, "SSL: Could not allocate memory "
"for TLS data");
return -1;
}
os_memcpy(buf + data->tls_in_len, *in_data, *in_len);
data->tls_in = buf;
data->tls_in_len += *in_len;
if (*in_len > data->tls_in_left) {
wpa_printf(MSG_INFO, "SSL: more data than TLS message "
"length indicated");
data->tls_in_left = 0;
return -1;
}
data->tls_in_left -= *in_len;
if (data->tls_in_left > 0) {
wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
"data", (unsigned long) data->tls_in_left);
return 1;
}
*in_data = data->tls_in;
*in_len = data->tls_in_len;
} else
data->tls_in_left = 0;
return 0;
}
int eap_server_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
const u8 *in_data, size_t in_len)
{
WPA_ASSERT(data->tls_out_len == 0 || in_len == 0);
if (data->tls_out_len == 0) {
u8 *_in_data = (u8 *) in_data; /* FIX: get rid of the typecast
*/
/* No more data to send out - expect to receive more data from
* the peer. */
int res = eap_server_tls_data_reassemble(sm, data, &_in_data,
&in_len);
if (res < 0 || res == 1) {
wpa_printf(MSG_DEBUG, "SSL: data reassembly failed");
return res;
}
/* Full TLS message reassembled - continue handshake processing
*/
if (data->tls_out) {
/* This should not happen.. */
wpa_printf(MSG_INFO, "SSL: eap_tls_process_helper - "
"pending tls_out data even though "
"tls_out_len = 0");
os_free(data->tls_out);
WPA_ASSERT(data->tls_out == NULL);
}
data->tls_out = tls_connection_server_handshake(
sm->ssl_ctx, data->conn, _in_data, in_len,
&data->tls_out_len);
/* Clear reassembled input data (if the buffer was needed). */
data->tls_in_left = data->tls_in_total = data->tls_in_len = 0;
os_free(data->tls_in);
data->tls_in = NULL;
}
if (data->tls_out == NULL) {
wpa_printf(MSG_DEBUG, "SSL: failed to generate output data");
data->tls_out_len = 0;
return -1;
}
if (data->tls_out_len == 0) {
/* TLS negotiation should now be complete since all other cases
* needing more that should have been catched above based on
* the TLS Message Length field. */
wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
os_free(data->tls_out);
data->tls_out = NULL;
if (tls_connection_get_read_alerts(sm->ssl_ctx, data->conn)) {
wpa_printf(MSG_DEBUG, "SSL: Remote end sent a fatal "
"alert - abort handshake");
return -1;
}
return 1;
}
wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
"%lu bytes)",
(unsigned long) data->tls_out_len - data->tls_out_pos,
(unsigned long) data->tls_out_len);
return 0;
}
int eap_server_tls_buildReq_helper(struct eap_sm *sm,
struct eap_ssl_data *data,
int eap_type, int peap_version, u8 id,
struct wpabuf **out_data)
{
size_t len;
u8 *flags;
struct wpabuf *req;
int incl_len;
u8 flags;
size_t send_len, plen;
incl_len = data->tls_out_pos == 0 &&
data->tls_out_len > data->tls_out_limit;
req = eap_msg_alloc(EAP_VENDOR_IETF, eap_type,
1 + (incl_len ? 4 : 0) + data->tls_out_limit,
wpa_printf(MSG_DEBUG, "SSL: Generating Request");
flags = peap_version;
send_len = wpabuf_len(data->out_buf) - data->out_used;
if (1 + send_len > data->tls_out_limit) {
send_len = data->tls_out_limit - 1;
flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
if (data->out_used == 0) {
flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
send_len -= 4;
}
}
plen = 1 + send_len;
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
plen += 4;
req = eap_msg_alloc(EAP_VENDOR_IETF, eap_type, plen,
EAP_CODE_REQUEST, id);
if (req == NULL) {
*out_data = NULL;
return -1;
}
flags = wpabuf_put(req, 1);
*flags = peap_version;
if (incl_len) {
*flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
wpabuf_put_be32(req, data->tls_out_len);
if (req == NULL)
return NULL;
wpabuf_put_u8(req, flags); /* Flags */
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
wpabuf_put_be32(req, wpabuf_len(data->out_buf));
wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
send_len);
data->out_used += send_len;
if (data->out_used == wpabuf_len(data->out_buf)) {
wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
"(message sent completely)",
(unsigned long) send_len);
wpabuf_free(data->out_buf);
data->out_buf = NULL;
data->out_used = 0;
data->state = MSG;
} else {
wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
"(%lu more to send)", (unsigned long) send_len,
(unsigned long) wpabuf_len(data->out_buf) -
data->out_used);
data->state = WAIT_FRAG_ACK;
}
len = data->tls_out_len - data->tls_out_pos;
if (len > data->tls_out_limit) {
*flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
len = data->tls_out_limit;
wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
"will follow", (unsigned long) len);
}
wpabuf_put_data(req, &data->tls_out[data->tls_out_pos], len);
data->tls_out_pos += len;
eap_update_len(req);
*out_data = req;
if (!(*flags & EAP_TLS_FLAGS_MORE_FRAGMENTS)) {
data->tls_out_len = 0;
data->tls_out_pos = 0;
os_free(data->tls_out);
data->tls_out = NULL;
}
return 0;
return req;
}
@ -291,3 +175,183 @@ struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int peap_version)
wpabuf_put_u8(req, peap_version); /* Flags */
return req;
}
static int eap_server_tls_process_cont(struct eap_ssl_data *data,
const u8 *buf, size_t len)
{
/* Process continuation of a pending message */
if (len > wpabuf_tailroom(data->in_buf)) {
wpa_printf(MSG_DEBUG, "SSL: Fragment overflow");
return -1;
}
wpabuf_put_data(data->in_buf, buf, len);
wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes, waiting for %lu "
"bytes more", (unsigned long) len,
(unsigned long) wpabuf_tailroom(data->in_buf));
return 0;
}
static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
u8 flags, u32 message_length,
const u8 *buf, size_t len)
{
/* Process a fragment that is not the last one of the message */
if (data->in_buf == NULL && !(flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
wpa_printf(MSG_DEBUG, "SSL: No Message Length field in a "
"fragmented packet");
return -1;
}
if (data->in_buf == NULL) {
/* First fragment of the message */
/* Limit length to avoid rogue peers from causing large
* memory allocations. */
if (message_length > 65536) {
wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
" over 64 kB)");
return -1;
}
data->in_buf = wpabuf_alloc(message_length);
if (data->in_buf == NULL) {
wpa_printf(MSG_DEBUG, "SSL: No memory for message");
return -1;
}
wpabuf_put_data(data->in_buf, buf, len);
wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes in first "
"fragment, waiting for %lu bytes more",
(unsigned long) len,
(unsigned long) wpabuf_tailroom(data->in_buf));
}
return 0;
}
int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data)
{
u8 *next;
size_t next_len;
next = tls_connection_server_handshake(
sm->ssl_ctx, data->conn,
wpabuf_mhead(data->in_buf),
wpabuf_len(data->in_buf),
&next_len);
if (next == NULL) {
wpa_printf(MSG_INFO, "SSL: TLS processing failed");
return -1;
}
if (data->out_buf) {
/* This should not happen.. */
wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
"processing new message");
os_free(data->out_buf);
WPA_ASSERT(data->out_buf == NULL);
}
data->out_buf = wpabuf_alloc_ext_data(next, next_len);
if (data->out_buf == NULL) {
os_free(next);
return -1;
}
return 0;
}
int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
const u8 **pos, size_t *left)
{
unsigned int tls_msg_len = 0;
const u8 *end = *pos + *left;
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
if (*left < 4) {
wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
"length");
return -1;
}
tls_msg_len = WPA_GET_BE32(*pos);
wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
tls_msg_len);
*pos += 4;
*left -= 4;
}
wpa_printf(MSG_DEBUG, "SSL: Received packet: Flags 0x%x "
"Message Length %u", flags, tls_msg_len);
if (data->state == WAIT_FRAG_ACK) {
if (*left != 0) {
wpa_printf(MSG_DEBUG, "SSL: Unexpected payload in "
"WAIT_FRAG_ACK state");
return -1;
}
wpa_printf(MSG_DEBUG, "SSL: Fragment acknowledged");
return 1;
}
if (data->in_buf &&
eap_server_tls_process_cont(data, *pos, end - *pos) < 0)
return -1;
if (flags & EAP_TLS_FLAGS_MORE_FRAGMENTS) {
if (eap_server_tls_process_fragment(data, flags, tls_msg_len,
*pos, end - *pos) < 0)
return -1;
data->state = FRAG_ACK;
return 1;
}
if (data->state == FRAG_ACK) {
wpa_printf(MSG_DEBUG, "SSL: All fragments received");
data->state = MSG;
}
if (data->in_buf == NULL) {
/* Wrap unfragmented messages as wpabuf without extra copy */
wpabuf_set(&data->tmpbuf, *pos, end - *pos);
data->in_buf = &data->tmpbuf;
}
return 0;
}
void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
{
if (data->in_buf != &data->tmpbuf)
wpabuf_free(data->in_buf);
data->in_buf = NULL;
}
struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
struct eap_ssl_data *data,
const u8 *plain, size_t plain_len)
{
int res;
struct wpabuf *buf;
size_t buf_len;
/* reserve some extra room for encryption overhead */
buf_len = plain_len + 200;
buf = wpabuf_alloc(buf_len);
res = tls_connection_encrypt(sm->ssl_ctx, data->conn,
plain, plain_len, wpabuf_put(buf, 0),
buf_len);
if (res < 0) {
wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
return buf;
}

34
src/eap_server/eap_tls_common.h
View file

@ -1,6 +1,6 @@
/*
* hostapd / EAP-TLS/PEAP/TTLS/FAST common functions
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -18,18 +18,17 @@
struct eap_ssl_data {
struct tls_connection *conn;
u8 *tls_out;
size_t tls_out_len;
size_t tls_out_pos;
size_t tls_out_limit;
u8 *tls_in;
size_t tls_in_len;
size_t tls_in_left;
size_t tls_in_total;
int phase2;
struct eap_sm *eap;
enum { MSG, FRAG_ACK, WAIT_FRAG_ACK } state;
struct wpabuf *in_buf;
struct wpabuf *out_buf;
size_t out_used;
struct wpabuf tmpbuf;
};
@ -48,16 +47,17 @@ int eap_server_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
void eap_server_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data);
u8 * eap_server_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
char *label, size_t len);
int eap_server_tls_data_reassemble(struct eap_sm *sm,
struct eap_ssl_data *data,
u8 **in_data, size_t *in_len);
int eap_server_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
const u8 *in_data, size_t in_len);
int eap_server_tls_buildReq_helper(struct eap_sm *sm,
struct eap_ssl_data *data,
int eap_type, int peap_version, u8 id,
struct wpabuf **out_data);
struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
int eap_type, int peap_version,
u8 id);
struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type,
int peap_version);
int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data);
int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
const u8 **pos, size_t *left);
void eap_server_tls_free_in_buf(struct eap_ssl_data *data);
struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
struct eap_ssl_data *data,
const u8 *plain, size_t plain_len);
#endif /* EAP_TLS_COMMON_H */

207
src/eap_server/eap_ttls.c
View file

@ -445,62 +445,6 @@ static struct wpabuf * eap_ttls_build_start(struct eap_sm *sm,
}
static struct wpabuf * eap_ttls_build_req(struct eap_sm *sm,
struct eap_ttls_data *data, u8 id)
{
int res;
struct wpabuf *req;
res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TTLS,
data->ttls_version, id, &req);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase1 done, starting "
"Phase2");
eap_ttls_state(data, PHASE2_START);
}
if (res == 1)
return eap_server_tls_build_ack(id, EAP_TYPE_TTLS,
data->ttls_version);
return req;
}
static struct wpabuf * eap_ttls_encrypt(struct eap_sm *sm,
struct eap_ttls_data *data,
u8 id, u8 *plain, size_t plain_len)
{
int res;
struct wpabuf *buf;
/* TODO: add support for fragmentation, if needed. This will need to
* add TLS Message Length field, if the frame is fragmented. */
buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS,
1 + data->ssl.tls_out_limit,
EAP_CODE_REQUEST, id);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, data->ttls_version);
res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
plain, plain_len, wpabuf_put(buf, 0),
data->ssl.tls_out_limit);
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 "
"data");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
eap_update_len(buf);
return buf;
}
static struct wpabuf * eap_ttls_build_phase2_eap_req(
struct eap_sm *sm, struct eap_ttls_data *data, u8 id)
{
@ -528,7 +472,7 @@ static struct wpabuf * eap_ttls_build_phase2_eap_req(
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated Phase "
"2 data", req, req_len);
encr_req = eap_ttls_encrypt(sm, data, id, req, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
wpabuf_free(buf);
return encr_req;
@ -536,7 +480,7 @@ static struct wpabuf * eap_ttls_build_phase2_eap_req(
static struct wpabuf * eap_ttls_build_phase2_mschapv2(
struct eap_sm *sm, struct eap_ttls_data *data, u8 id)
struct eap_sm *sm, struct eap_ttls_data *data)
{
struct wpabuf *encr_req;
u8 *req, *pos, *end;
@ -570,7 +514,7 @@ static struct wpabuf * eap_ttls_build_phase2_mschapv2(
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
"data", req, req_len);
encr_req = eap_ttls_encrypt(sm, data, id, req, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
os_free(req);
return encr_req;
@ -578,20 +522,16 @@ static struct wpabuf * eap_ttls_build_phase2_mschapv2(
static struct wpabuf * eap_ttls_build_phase_finished(
struct eap_sm *sm, struct eap_ttls_data *data, u8 id, int final)
struct eap_sm *sm, struct eap_ttls_data *data, int final)
{
int len;
struct wpabuf *req;
const int max_len = 300;
len = 1 + max_len;
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, len,
EAP_CODE_REQUEST, id);
req = wpabuf_alloc(max_len);
if (req == NULL)
return NULL;
wpabuf_put_u8(req, data->ttls_version);
len = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
data->ssl.conn, final,
wpabuf_mhead(req),
@ -601,7 +541,6 @@ static struct wpabuf * eap_ttls_build_phase_finished(
return NULL;
}
wpabuf_put(req, len);
eap_update_len(req);
return req;
}
@ -611,22 +550,50 @@ static struct wpabuf * eap_ttls_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_ttls_data *data = priv;
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_TTLS,
data->ttls_version);
}
if (data->ssl.state == WAIT_FRAG_ACK) {
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
data->ttls_version, id);
}
switch (data->state) {
case START:
return eap_ttls_build_start(sm, data, id);
case PHASE1:
return eap_ttls_build_req(sm, data, id);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase1 done, "
"starting Phase2");
eap_ttls_state(data, PHASE2_START);
}
break;
case PHASE2_METHOD:
return eap_ttls_build_phase2_eap_req(sm, data, id);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_ttls_build_phase2_eap_req(sm, data,
id);
break;
case PHASE2_MSCHAPV2_RESP:
return eap_ttls_build_phase2_mschapv2(sm, data, id);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_ttls_build_phase2_mschapv2(sm, data);
break;
case PHASE_FINISHED:
return eap_ttls_build_phase_finished(sm, data, id, 1);
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_ttls_build_phase_finished(sm, data, 1);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
__func__, data->state);
return NULL;
}
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
data->ttls_version, id);
}
@ -1148,12 +1115,17 @@ static void eap_ttls_process_phase2_eap(struct eap_sm *sm,
static void eap_ttls_process_phase2(struct eap_sm *sm,
struct eap_ttls_data *data,
u8 *in_data, size_t in_len)
struct wpabuf *in_buf)
{
u8 *in_decrypted;
int len_decrypted, res;
int len_decrypted;
struct eap_ttls_avp parse;
size_t buf_len;
u8 *in_data;
size_t in_len;
in_data = wpabuf_mhead(in_buf);
in_len = wpabuf_len(in_buf);
wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
" Phase 2", (unsigned long) in_len);
@ -1169,14 +1141,7 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
return;
}
res = eap_server_tls_data_reassemble(sm, &data->ssl, &in_data,
&in_len);
if (res < 0 || res == 1)
return;
buf_len = in_len;
if (data->ssl.tls_in_total > buf_len)
buf_len = data->ssl.tls_in_total;
/*
* Even though we try to disable TLS compression, it is possible that
* this cannot be done with all TLS libraries. Add extra buffer space
@ -1187,9 +1152,6 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
buf_len *= 3;
in_decrypted = os_malloc(buf_len);
if (in_decrypted == NULL) {
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
"for decryption");
return;
@ -1198,9 +1160,6 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
in_data, in_len,
in_decrypted, buf_len);
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
if (len_decrypted < 0) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
"data");
@ -1313,26 +1272,10 @@ static void eap_ttls_start_tnc(struct eap_sm *sm, struct eap_ttls_data *data)
}
static void eap_ttls_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
static void eap_ttls_process_version(struct eap_sm *sm,
struct eap_ttls_data *data,
int peer_version)
{
struct eap_ttls_data *data = priv;
const u8 *pos;
u8 flags;
size_t left;
unsigned int tls_msg_len;
int peer_version;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TTLS, respData,
&left);
if (pos == NULL || left < 1)
return;
flags = *pos++;
left--;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - "
"Flags 0x%02x", (unsigned long) wpabuf_len(respData),
flags);
peer_version = flags & EAP_PEAP_VERSION_MASK;
if (peer_version < data->ttls_version) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: peer ver=%d, own ver=%d; "
"use version %d",
@ -1349,42 +1292,46 @@ static void eap_ttls_process(struct eap_sm *sm, void *priv,
}
data->tls_ia_configured = 1;
}
}
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
if (left < 4) {
wpa_printf(MSG_INFO, "EAP-TTLS: Short frame with TLS "
"length");
static void eap_ttls_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_ttls_data *data = priv;
const u8 *pos;
u8 flags;
size_t left;
int ret;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TTLS, respData,
&left);
if (pos == NULL || left < 1)
return;
flags = *pos++;
left--;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - "
"Flags 0x%02x", (unsigned long) wpabuf_len(respData),
flags);
eap_ttls_process_version(sm, data, flags & EAP_PEAP_VERSION_MASK);
ret = eap_server_tls_reassemble(&data->ssl, flags, &pos, &left);
if (ret < 0) {
eap_ttls_state(data, FAILURE);
return;
}
tls_msg_len = WPA_GET_BE32(pos);
wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS Message Length: %d",
tls_msg_len);
if (data->ssl.tls_in_left == 0) {
data->ssl.tls_in_total = tls_msg_len;
data->ssl.tls_in_left = tls_msg_len;
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
}
pos += 4;
left -= 4;
}
} else if (ret == 1)
return;
switch (data->state) {
case PHASE1:
if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) <
0) {
wpa_printf(MSG_INFO, "EAP-TTLS: TLS processing "
"failed");
if (eap_server_tls_phase1(sm, &data->ssl) < 0)
eap_ttls_state(data, FAILURE);
}
break;
case PHASE2_START:
case PHASE2_METHOD:
case PHASE_FINISHED:
/* FIX: get rid of const->non-const typecast */
eap_ttls_process_phase2(sm, data, (u8 *) pos, left);
eap_ttls_process_phase2(sm, data, data->ssl.in_buf);
eap_ttls_start_tnc(sm, data);
break;
case PHASE2_MSCHAPV2_RESP:
@ -1417,6 +1364,8 @@ static void eap_ttls_process(struct eap_sm *sm, void *priv,
"in TLS processing");
eap_ttls_state(data, FAILURE);
}
eap_server_tls_free_in_buf(&data->ssl);
}