1 files changed, 460 insertions, 0 deletions

diff --git a/src/lib/libssl/d1_lib.c b/src/lib/libssl/d1_lib.c
new file mode 100644
index 0000000000..73c44c807a
--- /dev/null
+++ b/src/lib/libssl/d1_lib.c
@@ -0,0 +1,460 @@
+/* ssl/d1_lib.c */
+/* 
+ * 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 <sys/param.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <openssl/objects.h>
+#include "ssl_locl.h"
+
+static void get_current_time(struct timeval *t);
+const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
+int dtls1_listen(SSL *s, struct sockaddr *client);
+
+SSL3_ENC_METHOD DTLSv1_enc_data = {
+        dtls1_enc,
+        tls1_mac,
+        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,
+};
+
+long
+dtls1_default_timeout(void)
+{
+        /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
+         * is way too long for http, the cache would over fill */
+        return (60*60*2);
+}
+
+int
+dtls1_new(SSL *s)
+{
+        DTLS1_STATE *d1;
+
+        if (!ssl3_new(s))
+                return (0);
+        if ((d1 = OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
+                memset(d1, 0, sizeof *d1);
+
+        /* d1->handshake_epoch=0; */
+
+        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 (s->server) {
+                d1->cookie_len = sizeof(s->d1->cookie);
+        }
+
+        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);
+                return (0);
+        }
+
+        s->d1 = d1;
+        s->method->ssl_clear(s);
+        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;
+                OPENSSL_free(frag->fragment);
+                OPENSSL_free(frag);
+                pitem_free(item);
+        }
+
+        while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
+                frag = (hm_fragment *)item->data;
+                OPENSSL_free(frag->fragment);
+                OPENSSL_free(frag);
+                pitem_free(item);
+        }
+
+        while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
+                frag = (hm_fragment *)item->data;
+                OPENSSL_free(frag->fragment);
+                OPENSSL_free(frag);
+                pitem_free(item);
+        }
+}
+
+void
+dtls1_free(SSL *s)
+{
+        ssl3_free(s);
+
+        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;
+}
+
+void
+dtls1_clear(SSL *s)
+{
+        pqueue unprocessed_rcds;
+        pqueue processed_rcds;
+        pqueue buffered_messages;
+        pqueue sent_messages;
+        pqueue buffered_app_data;
+        unsigned int mtu;
+
+        if (s->d1) {
+                unprocessed_rcds = s->d1->unprocessed_rcds.q;
+                processed_rcds = s->d1->processed_rcds.q;
+                buffered_messages = s->d1->buffered_messages;
+                sent_messages = s->d1->sent_messages;
+                buffered_app_data = s->d1->buffered_app_data.q;
+                mtu = s->d1->mtu;
+
+                dtls1_clear_queues(s);
+
+                memset(s->d1, 0, sizeof(*(s->d1)));
+
+                if (s->server) {
+                        s->d1->cookie_len = sizeof(s->d1->cookie);
+                }
+
+                if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
+                        s->d1->mtu = mtu;
+                }
+
+                s->d1->unprocessed_rcds.q = unprocessed_rcds;
+                s->d1->processed_rcds.q = processed_rcds;
+                s->d1->buffered_messages = buffered_messages;
+                s->d1->sent_messages = sent_messages;
+                s->d1->buffered_app_data.q = buffered_app_data;
+        }
+
+        ssl3_clear(s);
+        if (s->options & SSL_OP_CISCO_ANYCONNECT)
+                s->version = DTLS1_BAD_VER;
+        else
+                s->version = DTLS1_VERSION;
+}
+
+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, (struct timeval*) parg) != NULL) {
+                        ret = 1;
+                }
+                break;
+        case DTLS_CTRL_HANDLE_TIMEOUT:
+                ret = dtls1_handle_timeout(s);
+                break;
+        case DTLS_CTRL_LISTEN:
+                ret = dtls1_listen(s, parg);
+                break;
+
+        default:
+                ret = ssl3_ctrl(s, cmd, larg, parg);
+                break;
+        }
+        return (ret);
+}
+
+/*
+ * As it's impossible to use stream ciphers in "datagram" mode, this
+ * simple filter is designed to disengage them in DTLS. Unfortunately
+ * there is no universal way to identify stream SSL_CIPHER, so we have
+ * to explicitly list their SSL_* codes. Currently RC4 is the only one
+ * available, but if new ones emerge, they will have to be added...
+ */
+const SSL_CIPHER
+*dtls1_get_cipher(unsigned int u)
+{
+        const SSL_CIPHER *ciph = ssl3_get_cipher(u);
+
+        if (ciph != NULL) {
+                if (ciph->algorithm_enc == SSL_RC4)
+                        return NULL;
+        }
+
+        return ciph;
+}
+
+void
+dtls1_start_timer(SSL *s)
+{
+#ifndef OPENSSL_NO_SCTP
+        /* Disable timer for SCTP */
+        if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
+                return;
+        }
+#endif
+
+        /* 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));
+}
+
+struct timeval*
+dtls1_get_timeout(SSL *s, struct timeval* timeleft) {
+        struct 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(struct timeval));
+                return timeleft;
+        }
+
+        /* Calculate time left until timer expires */
+        memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct 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(struct timeval));
+        }
+
+
+        return timeleft;
+}
+
+int
+dtls1_is_timer_expired(SSL *s)
+{
+        struct 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(struct 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) {
+                s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
+
+        }
+
+        if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
+                /* fail the connection, enough alerts have been sent */
+                SSLerr(SSL_F_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(struct timeval *t)
+{
+        gettimeofday(t, NULL);
+}
+
+int
+dtls1_listen(SSL *s, struct sockaddr *client)
+{
+        int ret;
+
+        SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
+        s->d1->listen = 1;
+
+        ret = SSL_accept(s);
+        if (ret <= 0)
+                return ret;
+
+        (void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
+        return 1;
+}