#include <stdio.h>
#define USE_SOCKETS
#include <openssl/objects.h>
+#include <openssl/rand.h>
#include "ssl_locl.h"
#if defined(OPENSSL_SYS_VMS)
static int dtls1_handshake_write(SSL *s);
int dtls1_listen(SSL *s, struct sockaddr *client);
+/* XDTLS: figure out the right values */
+static const unsigned int g_probable_mtu[] = { 1500, 512, 256 };
+
const SSL3_ENC_METHOD DTLSv1_enc_data = {
tls1_enc,
tls1_mac,
}
p = &buf[DTLS1_RT_HEADER_LENGTH];
- msglen = dtls1_raw_hello_verify_request(p + DTLS1_HM_HEADER_LENGTH,
- cookie, cookielen);
+ msglen = dtls_raw_hello_verify_request(p + DTLS1_HM_HEADER_LENGTH,
+ cookie, cookielen);
*p++ = DTLS1_MT_HELLO_VERIFY_REQUEST;
*/
SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
- /* Put us into the "init" state so that we don't get our state cleared */
- statem_set_in_init(s, 1);
+ /*
+ * Tell the state machine that we've done the initial hello verify
+ * exchange
+ */
+ ossl_statem_set_hello_verify_done(s);
if(BIO_dgram_get_peer(rbio, client) <= 0) {
SSLerr(SSL_F_DTLS1_LISTEN, ERR_R_INTERNAL_ERROR);
{
return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
}
+
+#ifndef OPENSSL_NO_HEARTBEATS
+int dtls1_process_heartbeat(SSL *s, unsigned char *p, unsigned int length)
+{
+ unsigned char *pl;
+ unsigned short hbtype;
+ unsigned int payload;
+ unsigned int padding = 16; /* Use minimum padding */
+
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
+ p, length, s, s->msg_callback_arg);
+
+ /* Read type and payload length first */
+ if (1 + 2 + 16 > length)
+ return 0; /* silently discard */
+ if (length > SSL3_RT_MAX_PLAIN_LENGTH)
+ return 0; /* silently discard per RFC 6520 sec. 4 */
+
+ hbtype = *p++;
+ n2s(p, payload);
+ if (1 + 2 + payload + 16 > length)
+ return 0; /* silently discard per RFC 6520 sec. 4 */
+ pl = p;
+
+ if (hbtype == TLS1_HB_REQUEST) {
+ unsigned char *buffer, *bp;
+ unsigned int write_length = 1 /* heartbeat type */ +
+ 2 /* heartbeat length */ +
+ payload + padding;
+ int r;
+
+ if (write_length > SSL3_RT_MAX_PLAIN_LENGTH)
+ return 0;
+
+ /*
+ * Allocate memory for the response, size is 1 byte message type,
+ * plus 2 bytes payload length, plus payload, plus padding
+ */
+ buffer = OPENSSL_malloc(write_length);
+ if (buffer == NULL)
+ return -1;
+ bp = buffer;
+
+ /* Enter response type, length and copy payload */
+ *bp++ = TLS1_HB_RESPONSE;
+ s2n(payload, bp);
+ memcpy(bp, pl, payload);
+ bp += payload;
+ /* Random padding */
+ if (RAND_bytes(bp, padding) <= 0) {
+ OPENSSL_free(buffer);
+ return -1;
+ }
+
+ r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, write_length);
+
+ if (r >= 0 && s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buffer, write_length, s, s->msg_callback_arg);
+
+ OPENSSL_free(buffer);
+
+ if (r < 0)
+ return r;
+ } else if (hbtype == TLS1_HB_RESPONSE) {
+ unsigned int seq;
+
+ /*
+ * We only send sequence numbers (2 bytes unsigned int), and 16
+ * random bytes, so we just try to read the sequence number
+ */
+ n2s(pl, seq);
+
+ if (payload == 18 && seq == s->tlsext_hb_seq) {
+ dtls1_stop_timer(s);
+ s->tlsext_hb_seq++;
+ s->tlsext_hb_pending = 0;
+ }
+ }
+
+ return 0;
+}
+
+int dtls1_heartbeat(SSL *s)
+{
+ unsigned char *buf, *p;
+ int ret = -1;
+ unsigned int payload = 18; /* Sequence number + random bytes */
+ unsigned int padding = 16; /* Use minimum padding */
+
+ /* Only send if peer supports and accepts HB requests... */
+ if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
+ s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
+ return -1;
+ }
+
+ /* ...and there is none in flight yet... */
+ if (s->tlsext_hb_pending) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING);
+ return -1;
+ }
+
+ /* ...and no handshake in progress. */
+ if (SSL_in_init(s) || ossl_statem_get_in_handshake(s)) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
+ return -1;
+ }
+
+ /*
+ * Check if padding is too long, payload and padding must not exceed 2^14
+ * - 3 = 16381 bytes in total.
+ */
+ OPENSSL_assert(payload + padding <= 16381);
+
+ /*-
+ * Create HeartBeat message, we just use a sequence number
+ * as payload to distuingish different messages and add
+ * some random stuff.
+ * - Message Type, 1 byte
+ * - Payload Length, 2 bytes (unsigned int)
+ * - Payload, the sequence number (2 bytes uint)
+ * - Payload, random bytes (16 bytes uint)
+ * - Padding
+ */
+ buf = OPENSSL_malloc(1 + 2 + payload + padding);
+ if (buf == NULL) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ p = buf;
+ /* Message Type */
+ *p++ = TLS1_HB_REQUEST;
+ /* Payload length (18 bytes here) */
+ s2n(payload, p);
+ /* Sequence number */
+ s2n(s->tlsext_hb_seq, p);
+ /* 16 random bytes */
+ if (RAND_bytes(p, 16) <= 0) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ p += 16;
+ /* Random padding */
+ if (RAND_bytes(p, padding) <= 0) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
+ if (ret >= 0) {
+ if (s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buf, 3 + payload + padding,
+ s, s->msg_callback_arg);
+
+ dtls1_start_timer(s);
+ s->tlsext_hb_pending = 1;
+ }
+
+ err:
+ OPENSSL_free(buf);
+
+ return ret;
+}
+#endif
+
+int dtls1_shutdown(SSL *s)
+{
+ int ret;
+#ifndef OPENSSL_NO_SCTP
+ BIO *wbio;
+
+ wbio = SSL_get_wbio(s);
+ if (wbio != NULL && BIO_dgram_is_sctp(wbio) &&
+ !(s->shutdown & SSL_SENT_SHUTDOWN)) {
+ ret = BIO_dgram_sctp_wait_for_dry(wbio);
+ if (ret < 0)
+ return -1;
+
+ if (ret == 0)
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1,
+ NULL);
+ }
+#endif
+ ret = ssl3_shutdown(s);
+#ifndef OPENSSL_NO_SCTP
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
+#endif
+ return ret;
+}
+
+int dtls1_query_mtu(SSL *s)
+{
+ if (s->d1->link_mtu) {
+ s->d1->mtu =
+ s->d1->link_mtu - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
+ s->d1->link_mtu = 0;
+ }
+
+ /* AHA! Figure out the MTU, and stick to the right size */
+ if (s->d1->mtu < dtls1_min_mtu(s)) {
+ if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
+ s->d1->mtu =
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
+
+ /*
+ * I've seen the kernel return bogus numbers when it doesn't know
+ * (initial write), so just make sure we have a reasonable number
+ */
+ if (s->d1->mtu < dtls1_min_mtu(s)) {
+ /* Set to min mtu */
+ s->d1->mtu = dtls1_min_mtu(s);
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
+ s->d1->mtu, NULL);
+ }
+ } else
+ return 0;
+ }
+ return 1;
+}
+
+unsigned int dtls1_link_min_mtu(void)
+{
+ return (g_probable_mtu[(sizeof(g_probable_mtu) /
+ sizeof(g_probable_mtu[0])) - 1]);
+}
+
+unsigned int dtls1_min_mtu(SSL *s)
+{
+ return dtls1_link_min_mtu() - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
+}
projects / openssl.git / blobdiff