/**
* tlsv1_client_handshake - Process TLS handshake
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Input data from TLS peer
* @in_len: Input data length
* @out_len: Length of the output buffer.
* @appl_data: Pointer to application data pointer, or %NULL if dropped
* @appl_data_len: Pointer to variable that is set to appl_data length
* Returns: Pointer to output data, %NULL on failure
*/
u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
size_t *out_len, u8 **appl_data,
size_t *appl_data_len)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
int no_appl_data;
if (conn->state == CLIENT_HELLO) {
if (in_len)
return NULL;
return tls_send_client_hello(conn, out_len);
}
if (in_data == NULL || in_len == 0)
return NULL;
pos = in_data;
end = in_data + in_len;
in_msg = os_malloc(in_len);
if (in_msg == NULL)
return NULL;
/* Each received packet may include multiple records */
while (pos < end) {
in_msg_len = in_len;
if (tlsv1_record_receive(&conn->rl, pos, end - pos,
in_msg, &in_msg_len, &alert)) {
wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
"record failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
goto failed;
}
ct = pos[0];
in_pos = in_msg;
in_end = in_msg + in_msg_len;
/* Each received record may include multiple messages of the
* same ContentType. */
while (in_pos < in_end) {
in_msg_len = in_end - in_pos;
if (tlsv1_client_process_handshake(conn, ct, in_pos,
&in_msg_len,
appl_data,
appl_data_len) < 0)
goto failed;
in_pos += in_msg_len;
}
pos += TLS_RECORD_HEADER_LEN + WPA_GET_BE16(pos + 3);
}
os_free(in_msg);
in_msg = NULL;
no_appl_data = appl_data == NULL || *appl_data == NULL;
msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
failed:
os_free(in_msg);
if (conn->alert_level) {
conn->state = FAILED;
os_free(msg);
msg = tlsv1_client_send_alert(conn, conn->alert_level,
conn->alert_description,
out_len);
} else if (msg == NULL) {
msg = os_zalloc(1);
*out_len = 0;
}
return msg;
}
/**
* tlsv1_client_handshake - Process TLS handshake
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Input data from TLS peer
* @in_len: Input data length
* @out_len: Length of the output buffer.
* @appl_data: Pointer to application data pointer, or %NULL if dropped
* @appl_data_len: Pointer to variable that is set to appl_data length
* @need_more_data: Set to 1 if more data would be needed to complete
* processing
* Returns: Pointer to output data, %NULL on failure
*/
u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
size_t *out_len, u8 **appl_data,
size_t *appl_data_len, int *need_more_data)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
int no_appl_data;
int used;
if (need_more_data)
*need_more_data = 0;
if (conn->state == CLIENT_HELLO) {
if (in_len)
return NULL;
return tls_send_client_hello(conn, out_len);
}
if (conn->partial_input) {
if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for pending record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
wpabuf_put_data(conn->partial_input, in_data, in_len);
in_data = wpabuf_head(conn->partial_input);
in_len = wpabuf_len(conn->partial_input);
}
if (in_data == NULL || in_len == 0)
return NULL;
pos = in_data;
end = in_data + in_len;
in_msg = os_malloc(in_len);
if (in_msg == NULL)
return NULL;
/* Each received packet may include multiple records */
while (pos < end) {
in_msg_len = in_len;
used = tlsv1_record_receive(&conn->rl, pos, end - pos,
in_msg, &in_msg_len, &alert);
if (used < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
"record failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
goto failed;
}
if (used == 0) {
struct wpabuf *partial;
wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
partial = wpabuf_alloc_copy(pos, end - pos);
wpabuf_free(conn->partial_input);
conn->partial_input = partial;
if (conn->partial_input == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"allocate memory for pending "
"record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
os_free(in_msg);
if (need_more_data)
*need_more_data = 1;
return NULL;
}
ct = pos[0];
in_pos = in_msg;
in_end = in_msg + in_msg_len;
/* Each received record may include multiple messages of the
* same ContentType. */
while (in_pos < in_end) {
in_msg_len = in_end - in_pos;
if (tlsv1_client_process_handshake(conn, ct, in_pos,
&in_msg_len,
appl_data,
appl_data_len) < 0)
goto failed;
in_pos += in_msg_len;
}
pos += used;
}
os_free(in_msg);
in_msg = NULL;
no_appl_data = appl_data == NULL || *appl_data == NULL;
msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
failed:
os_free(in_msg);
if (conn->alert_level) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
conn->state = FAILED;
os_free(msg);
msg = tlsv1_client_send_alert(conn, conn->alert_level,
conn->alert_description,
out_len);
} else if (msg == NULL) {
msg = os_zalloc(1);
*out_len = 0;
}
if (need_more_data == NULL || !(*need_more_data)) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
}
return msg;
}