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eap-tls-common: Add support for fragmented response

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This commit is contained in:
Tim Kourt 2018-11-29 14:41:35 -08:00 committed by Denis Kenzior
parent 718f967d17
commit c35c91ad20
1 changed files with 78 additions and 4 deletions
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82
src/eap-tls-common.c
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@ -98,6 +98,11 @@ struct eap_tls_state {
struct databuf *tx_pdu_buf;
struct databuf *rx_pdu_buf;
size_t tx_frag_offset;
size_t tx_frag_last_len;
bool expecting_frag_ack:1;
char *ca_cert;
char *client_cert;
char *client_key;
@ -109,12 +114,16 @@ struct eap_tls_state {
static void __eap_tls_common_state_reset(struct eap_tls_state *eap_tls)
{
eap_tls->version_negotiated = EAP_TLS_VERSION_NOT_NEGOTIATED;
eap_tls->expecting_frag_ack = false;
if (eap_tls->tunnel) {
l_tls_free(eap_tls->tunnel);
eap_tls->tunnel = NULL;
}
eap_tls->tx_frag_offset = 0;
eap_tls->tx_frag_last_len = 0;
if (eap_tls->plain_buf) {
databuf_free(eap_tls->plain_buf);
eap_tls->plain_buf = NULL;
@ -215,17 +224,55 @@ static bool eap_tls_validate_version(struct eap_state *eap,
return true;
}
static void eap_tls_send_fragment(struct eap_state *eap)
{
struct eap_tls_state *eap_tls = eap_get_data(eap);
size_t mtu = eap_get_mtu(eap);
uint8_t buf[mtu];
size_t len = eap_tls->tx_pdu_buf->len - eap_tls->tx_frag_offset;
size_t header_len = EAP_TLS_HEADER_LEN;
buf[EAP_TLS_HEADER_OCTET_FLAGS] = eap_tls->version_negotiated;
if (len > mtu - EAP_TLS_HEADER_LEN) {
len = mtu - EAP_TLS_HEADER_LEN;
buf[EAP_TLS_HEADER_OCTET_FLAGS] |= EAP_TLS_FLAG_M;
eap_tls->expecting_frag_ack = true;
}
if (!eap_tls->tx_frag_offset) {
buf[EAP_TLS_HEADER_OCTET_FLAGS] |= EAP_TLS_FLAG_L;
l_put_be32(eap_tls->tx_pdu_buf->len,
&buf[EAP_TLS_HEADER_OCTET_FRAG_LEN]);
len -= 4;
header_len += 4;
}
memcpy(buf + header_len,
eap_tls->tx_pdu_buf->data + eap_tls->tx_frag_offset, len);
eap_send_response(eap, eap_get_method_type(eap), buf, header_len + len);
eap_tls->tx_frag_last_len = len;
}
static void eap_tls_send_response(struct eap_state *eap,
const uint8_t *pdu, size_t pdu_len)
{
struct eap_tls_state *eap_tls = eap_get_data(eap);
size_t msg_len = EAP_TLS_HEADER_LEN + pdu_len;
uint8_t buf[msg_len];
buf[EAP_TLS_HEADER_OCTET_FLAGS] = eap_tls->version_negotiated;
memcpy(buf + EAP_TLS_HEADER_LEN, pdu, pdu_len);
if (msg_len <= eap_get_mtu(eap)) {
uint8_t buf[msg_len];
eap_send_response(eap, eap_get_method_type(eap), buf, msg_len);
buf[EAP_TLS_HEADER_OCTET_FLAGS] = eap_tls->version_negotiated;
memcpy(buf + EAP_TLS_HEADER_LEN, pdu, pdu_len);
eap_send_response(eap, eap_get_method_type(eap), buf, msg_len);
return;
}
eap_tls->tx_frag_offset = 0;
eap_tls_send_fragment(eap);
}
static void eap_tls_common_send_empty_response(struct eap_state *eap)
@ -334,6 +381,26 @@ static void eap_tls_send_fragmented_request_ack(struct eap_state *eap)
eap_tls_common_send_empty_response(eap);
}
static bool eap_tls_handle_fragmented_response_ack(struct eap_state *eap,
size_t len)
{
struct eap_tls_state *eap_tls = eap_get_data(eap);
if (len)
return false;
if (!eap_tls->tx_frag_last_len)
return false;
eap_tls->tx_frag_offset += eap_tls->tx_frag_last_len;
eap_tls->tx_frag_last_len = 0;
eap_tls->expecting_frag_ack = false;
eap_tls_send_fragment(eap);
return true;
}
static int eap_tls_handle_fragmented_request(struct eap_state *eap,
const uint8_t *pkt,
size_t len,
@ -431,6 +498,13 @@ void eap_tls_common_handle_request(struct eap_state *eap,
pkt += 1;
len -= 1;
if (eap_tls->expecting_frag_ack) {
if (!eap_tls_handle_fragmented_response_ack(eap, len))
goto error;
return;
}
if (flags_version & EAP_TLS_FLAG_L || eap_tls->rx_pdu_buf) {
int r = eap_tls_handle_fragmented_request(eap, pkt, len,
flags_version);