1 files changed, 439 insertions, 0 deletions

diff --git a/src/ssl/d1_lib.c b/src/ssl/d1_lib.c
new file mode 100644
index 0000000..8244cb9
--- /dev/null
+++ b/src/ssl/d1_lib.c
@@ -0,0 +1,439 @@
+/*
+ * DTLS implementation written by Nagendra Modadugu
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <openssl/base.h>
+
+#include <limits.h>
+#include <stdio.h>
+
+#if defined(OPENSSL_WINDOWS)
+#include <sys/timeb.h>
+#else
+#include <sys/socket.h>
+#include <sys/time.h>
+#endif
+
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/obj.h>
+
+#include "ssl_locl.h"
+
+static void get_current_time(OPENSSL_timeval *t);
+static OPENSSL_timeval *dtls1_get_timeout(SSL *s, OPENSSL_timeval *timeleft);
+static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
+static int dtls1_handshake_write(SSL *s);
+
+const SSL3_ENC_METHOD DTLSv1_enc_data = {
+  tls1_enc,
+  tls1_prf,
+  tls1_setup_key_block,
+  tls1_generate_master_secret,
+  tls1_change_cipher_state,
+  tls1_final_finish_mac,
+  TLS1_FINISH_MAC_LENGTH,
+  tls1_cert_verify_mac,
+  TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
+  TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
+  tls1_alert_code,
+  tls1_export_keying_material,
+  SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV,
+  DTLS1_HM_HEADER_LENGTH,
+  dtls1_set_handshake_header,
+  dtls1_handshake_write,
+};
+
+const SSL3_ENC_METHOD DTLSv1_2_enc_data = {
+  tls1_enc,
+  tls1_prf,
+  tls1_setup_key_block,
+  tls1_generate_master_secret,
+  tls1_change_cipher_state,
+  tls1_final_finish_mac,
+  TLS1_FINISH_MAC_LENGTH,
+  tls1_cert_verify_mac,
+  TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
+  TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
+  tls1_alert_code,
+  tls1_export_keying_material,
+  SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS |
+      SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS,
+  DTLS1_HM_HEADER_LENGTH,
+  dtls1_set_handshake_header,
+  dtls1_handshake_write,
+};
+
+int dtls1_new(SSL *s) {
+  DTLS1_STATE *d1;
+
+  if (!ssl3_new(s)) {
+    return 0;
+  }
+  d1 = OPENSSL_malloc(sizeof *d1);
+  if (d1 == NULL) {
+    ssl3_free(s);
+    return 0;
+  }
+  memset(d1, 0, sizeof *d1);
+
+  d1->unprocessed_rcds.q = pqueue_new();
+  d1->processed_rcds.q = pqueue_new();
+  d1->buffered_messages = pqueue_new();
+  d1->sent_messages = pqueue_new();
+  d1->buffered_app_data.q = pqueue_new();
+
+  if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q ||
+      !d1->buffered_messages || !d1->sent_messages ||
+      !d1->buffered_app_data.q) {
+    if (d1->unprocessed_rcds.q) {
+      pqueue_free(d1->unprocessed_rcds.q);
+    }
+    if (d1->processed_rcds.q) {
+      pqueue_free(d1->processed_rcds.q);
+    }
+    if (d1->buffered_messages) {
+      pqueue_free(d1->buffered_messages);
+    }
+    if (d1->sent_messages) {
+      pqueue_free(d1->sent_messages);
+    }
+    if (d1->buffered_app_data.q) {
+      pqueue_free(d1->buffered_app_data.q);
+    }
+    OPENSSL_free(d1);
+    ssl3_free(s);
+    return 0;
+  }
+
+  s->d1 = d1;
+
+  /* Set the version to the highest version for DTLS. This controls the initial
+   * state of |s->enc_method| and what the API reports as the version prior to
+   * negotiation.
+   *
+   * TODO(davidben): This is fragile and confusing. */
+  s->version = DTLS1_2_VERSION;
+  return 1;
+}
+
+static void dtls1_clear_queues(SSL *s) {
+  pitem *item = NULL;
+  hm_fragment *frag = NULL;
+  DTLS1_RECORD_DATA *rdata;
+
+  while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
+    rdata = (DTLS1_RECORD_DATA *)item->data;
+    if (rdata->rbuf.buf) {
+      OPENSSL_free(rdata->rbuf.buf);
+    }
+    OPENSSL_free(item->data);
+    pitem_free(item);
+  }
+
+  while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
+    rdata = (DTLS1_RECORD_DATA *)item->data;
+    if (rdata->rbuf.buf) {
+      OPENSSL_free(rdata->rbuf.buf);
+    }
+    OPENSSL_free(item->data);
+    pitem_free(item);
+  }
+
+  while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
+    frag = (hm_fragment *)item->data;
+    dtls1_hm_fragment_free(frag);
+    pitem_free(item);
+  }
+
+  while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
+    frag = (hm_fragment *)item->data;
+    dtls1_hm_fragment_free(frag);
+    pitem_free(item);
+  }
+
+  while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
+    rdata = (DTLS1_RECORD_DATA *)item->data;
+    if (rdata->rbuf.buf) {
+      OPENSSL_free(rdata->rbuf.buf);
+    }
+    OPENSSL_free(item->data);
+    pitem_free(item);
+  }
+}
+
+void dtls1_free(SSL *s) {
+  ssl3_free(s);
+
+  if (s == NULL || s->d1 == NULL) {
+    return;
+  }
+
+  dtls1_clear_queues(s);
+
+  pqueue_free(s->d1->unprocessed_rcds.q);
+  pqueue_free(s->d1->processed_rcds.q);
+  pqueue_free(s->d1->buffered_messages);
+  pqueue_free(s->d1->sent_messages);
+  pqueue_free(s->d1->buffered_app_data.q);
+
+  OPENSSL_free(s->d1);
+  s->d1 = NULL;
+}
+
+long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg) {
+  int ret = 0;
+
+  switch (cmd) {
+    case DTLS_CTRL_GET_TIMEOUT:
+      if (dtls1_get_timeout(s, (OPENSSL_timeval *)parg) != NULL) {
+        ret = 1;
+      }
+      break;
+
+    case DTLS_CTRL_HANDLE_TIMEOUT:
+      ret = dtls1_handle_timeout(s);
+      break;
+
+    default:
+      ret = ssl3_ctrl(s, cmd, larg, parg);
+      break;
+  }
+
+  return ret;
+}
+
+const SSL_CIPHER *dtls1_get_cipher(unsigned int u) {
+  const SSL_CIPHER *ciph = ssl3_get_cipher(u);
+  /* DTLS does not support stream ciphers. */
+  if (ciph == NULL || ciph->algorithm_enc == SSL_RC4) {
+    return NULL;
+  }
+
+  return ciph;
+}
+
+void dtls1_start_timer(SSL *s) {
+  /* If timer is not set, initialize duration with 1 second */
+  if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
+    s->d1->timeout_duration = 1;
+  }
+
+  /* Set timeout to current time */
+  get_current_time(&s->d1->next_timeout);
+
+  /* Add duration to current time */
+  s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
+  BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
+           &s->d1->next_timeout);
+}
+
+static OPENSSL_timeval *dtls1_get_timeout(SSL *s, OPENSSL_timeval *timeleft) {
+  OPENSSL_timeval timenow;
+
+  /* If no timeout is set, just return NULL */
+  if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
+    return NULL;
+  }
+
+  /* Get current time */
+  get_current_time(&timenow);
+
+  /* If timer already expired, set remaining time to 0 */
+  if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
+      (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
+       s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
+    memset(timeleft, 0, sizeof(OPENSSL_timeval));
+    return timeleft;
+  }
+
+  /* Calculate time left until timer expires */
+  memcpy(timeleft, &s->d1->next_timeout, sizeof(OPENSSL_timeval));
+  timeleft->tv_sec -= timenow.tv_sec;
+  timeleft->tv_usec -= timenow.tv_usec;
+  if (timeleft->tv_usec < 0) {
+    timeleft->tv_sec--;
+    timeleft->tv_usec += 1000000;
+  }
+
+  /* If remaining time is less than 15 ms, set it to 0 to prevent issues
+   * because of small devergences with socket timeouts. */
+  if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
+    memset(timeleft, 0, sizeof(OPENSSL_timeval));
+  }
+
+  return timeleft;
+}
+
+int dtls1_is_timer_expired(SSL *s) {
+  OPENSSL_timeval timeleft;
+
+  /* Get time left until timeout, return false if no timer running */
+  if (dtls1_get_timeout(s, &timeleft) == NULL) {
+    return 0;
+  }
+
+  /* Return false if timer is not expired yet */
+  if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
+    return 0;
+  }
+
+  /* Timer expired, so return true */
+  return 1;
+}
+
+void dtls1_double_timeout(SSL *s) {
+  s->d1->timeout_duration *= 2;
+  if (s->d1->timeout_duration > 60) {
+    s->d1->timeout_duration = 60;
+  }
+  dtls1_start_timer(s);
+}
+
+void dtls1_stop_timer(SSL *s) {
+  /* Reset everything */
+  memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
+  memset(&s->d1->next_timeout, 0, sizeof(OPENSSL_timeval));
+  s->d1->timeout_duration = 1;
+  BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
+           &s->d1->next_timeout);
+  /* Clear retransmission buffer */
+  dtls1_clear_record_buffer(s);
+}
+
+int dtls1_check_timeout_num(SSL *s) {
+  s->d1->timeout.num_alerts++;
+
+  /* Reduce MTU after 2 unsuccessful retransmissions */
+  if (s->d1->timeout.num_alerts > 2 &&
+      !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
+    long mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0,
+                        NULL);
+    if (mtu >= 0 && mtu <= (1 << 30) && (unsigned)mtu >= dtls1_min_mtu()) {
+      s->d1->mtu = (unsigned)mtu;
+    }
+  }
+
+  if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
+    /* fail the connection, enough alerts have been sent */
+    OPENSSL_PUT_ERROR(SSL, dtls1_check_timeout_num, SSL_R_READ_TIMEOUT_EXPIRED);
+    return -1;
+  }
+
+  return 0;
+}
+
+int dtls1_handle_timeout(SSL *s) {
+  /* if no timer is expired, don't do anything */
+  if (!dtls1_is_timer_expired(s)) {
+    return 0;
+  }
+
+  dtls1_double_timeout(s);
+
+  if (dtls1_check_timeout_num(s) < 0) {
+    return -1;
+  }
+
+  s->d1->timeout.read_timeouts++;
+  if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
+    s->d1->timeout.read_timeouts = 1;
+  }
+
+  dtls1_start_timer(s);
+  return dtls1_retransmit_buffered_messages(s);
+}
+
+static void get_current_time(OPENSSL_timeval *t) {
+#if defined(OPENSSL_WINDOWS)
+  struct _timeb time;
+  _ftime(&time);
+  t->tv_sec = time.time;
+  t->tv_usec = time.millitm * 1000;
+#else
+  gettimeofday(t, NULL);
+#endif
+}
+
+static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len) {
+  uint8_t *message = (uint8_t *)s->init_buf->data;
+  const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
+  uint8_t serialised_header[DTLS1_HM_HEADER_LENGTH];
+  uint8_t *p = serialised_header;
+
+  s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
+  s->d1->next_handshake_write_seq++;
+
+  dtls1_set_message_header(s, htype, len, s->d1->handshake_write_seq, 0, len);
+  s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH;
+  s->init_off = 0;
+
+  /* Buffer the message to handle re-xmits */
+  dtls1_buffer_message(s, 0);
+
+  /* Add the new message to the handshake hash. Serialize the message
+   * header as if it were a single fragment. */
+  *p++ = msg_hdr->type;
+  l2n3(msg_hdr->msg_len, p);
+  s2n(msg_hdr->seq, p);
+  l2n3(0, p);
+  l2n3(msg_hdr->msg_len, p);
+  ssl3_finish_mac(s, serialised_header, sizeof(serialised_header));
+  ssl3_finish_mac(s, message + DTLS1_HM_HEADER_LENGTH, len);
+}
+
+static int dtls1_handshake_write(SSL *s) {
+  return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
+}