1 files changed, 426 insertions, 201 deletions

diff --git a/src/lib/libssl/d1_both.c b/src/lib/libssl/d1_both.c
index 15a201a25c..4ce4064cc9 100644
--- a/src/lib/libssl/d1_both.c
+++ b/src/lib/libssl/d1_both.c
@@ -123,6 +123,37 @@
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 
+#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
+
+#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
+                        if ((end) - (start) <= 8) { \
+                                long ii; \
+                                for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
+                        } else { \
+                                long ii; \
+                                bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
+                                for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
+                                bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
+                        } }
+
+#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
+                        long ii; \
+                        OPENSSL_assert((msg_len) > 0); \
+                        is_complete = 1; \
+                        if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
+                        if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
+                                if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
+
+#if 0
+#define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
+                        long ii; \
+                        printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
+                        printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
+                        printf("\n"); }
+#endif
+
+static unsigned char bitmask_start_values[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
+static unsigned char bitmask_end_values[]   = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
 
 /* XDTLS:  figure out the right values */
 static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
@@ -136,15 +167,15 @@ static unsigned char *dtls1_write_message_header(SSL *s,
 static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
         unsigned long len, unsigned short seq_num, unsigned long frag_off, 
         unsigned long frag_len);
-static int dtls1_retransmit_buffered_messages(SSL *s);
 static long dtls1_get_message_fragment(SSL *s, int st1, int stn, 
         long max, int *ok);
 
 static hm_fragment *
-dtls1_hm_fragment_new(unsigned long frag_len)
+dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
         {
         hm_fragment *frag = NULL;
         unsigned char *buf = NULL;
+        unsigned char *bitmask = NULL;
 
         frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
         if ( frag == NULL)
@@ -163,6 +194,21 @@ dtls1_hm_fragment_new(unsigned long frag_len)
         /* zero length fragment gets zero frag->fragment */
         frag->fragment = buf;
 
+        /* Initialize reassembly bitmask if necessary */
+        if (reassembly)
+                {
+                bitmask = (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len));
+                if (bitmask == NULL)
+                        {
+                        if (buf != NULL) OPENSSL_free(buf);
+                        OPENSSL_free(frag);
+                        return NULL;
+                        }
+                memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
+                }
+
+        frag->reassembly = bitmask;
+
         return frag;
         }
 
@@ -170,6 +216,7 @@ static void
 dtls1_hm_fragment_free(hm_fragment *frag)
         {
         if (frag->fragment) OPENSSL_free(frag->fragment);
+        if (frag->reassembly) OPENSSL_free(frag->reassembly);
         OPENSSL_free(frag);
         }
 
@@ -178,7 +225,7 @@ int dtls1_do_write(SSL *s, int type)
         {
         int ret;
         int curr_mtu;
-        unsigned int len, frag_off;
+        unsigned int len, frag_off, mac_size, blocksize;
 
         /* AHA!  Figure out the MTU, and stick to the right size */
         if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
@@ -226,11 +273,22 @@ int dtls1_do_write(SSL *s, int type)
                 OPENSSL_assert(s->init_num == 
                         (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
 
+        if (s->write_hash)
+                mac_size = EVP_MD_CTX_size(s->write_hash);
+        else
+                mac_size = 0;
+
+        if (s->enc_write_ctx && 
+                (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
+                blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
+        else
+                blocksize = 0;
+
         frag_off = 0;
         while( s->init_num)
                 {
                 curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - 
-                        DTLS1_RT_HEADER_LENGTH;
+                        DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
 
                 if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
                         {
@@ -238,7 +296,8 @@ int dtls1_do_write(SSL *s, int type)
                         ret = BIO_flush(SSL_get_wbio(s));
                         if ( ret <= 0)
                                 return ret;
-                        curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH;
+                        curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
+                                mac_size - blocksize;
                         }
 
                 if ( s->init_num > curr_mtu)
@@ -280,7 +339,7 @@ int dtls1_do_write(SSL *s, int type)
                          * retransmit 
                          */
                         if ( BIO_ctrl(SSL_get_wbio(s),
-                                BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL))
+                                BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 )
                                 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
                                         BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
                         else
@@ -301,7 +360,7 @@ int dtls1_do_write(SSL *s, int type)
                                 const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
                                 int xlen;
 
-                                if (frag_off == 0 && s->client_version != DTLS1_BAD_VER)
+                                if (frag_off == 0 && s->version != DTLS1_BAD_VER)
                                         {
                                         /* reconstruct message header is if it
                                          * is being sent in single fragment */
@@ -352,6 +411,8 @@ long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
         {
         int i, al;
         struct hm_header_st *msg_hdr;
+        unsigned char *p;
+        unsigned long msg_len;
 
         /* s3->tmp is used to store messages that are unexpected, caused
          * by the absence of an optional handshake message */
@@ -371,76 +432,55 @@ long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                 }
 
         msg_hdr = &s->d1->r_msg_hdr;
-        do
-                {
-                if ( msg_hdr->frag_off == 0)
-                        {
-                        /* s->d1->r_message_header.msg_len = 0; */
-                        memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
-                        }
+        memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
 
-                i = dtls1_get_message_fragment(s, st1, stn, max, ok);
-                if ( i == DTLS1_HM_BAD_FRAGMENT ||
-                        i == DTLS1_HM_FRAGMENT_RETRY)  /* bad fragment received */
-                        continue;
-                else if ( i <= 0 && !*ok)
-                        return i;
+again:
+        i = dtls1_get_message_fragment(s, st1, stn, max, ok);
+        if ( i == DTLS1_HM_BAD_FRAGMENT ||
+                i == DTLS1_HM_FRAGMENT_RETRY)  /* bad fragment received */
+                goto again;
+        else if ( i <= 0 && !*ok)
+                return i;
 
-                /* Note that s->init_sum is used as a counter summing
-                 * up fragments' lengths: as soon as they sum up to
-                 * handshake packet length, we assume we have got all
-                 * the fragments. Overlapping fragments would cause
-                 * premature termination, so we don't expect overlaps.
-                 * Well, handling overlaps would require something more
-                 * drastic. Indeed, as it is now there is no way to
-                 * tell if out-of-order fragment from the middle was
-                 * the last. '>=' is the best/least we can do to control
-                 * the potential damage caused by malformed overlaps. */
-                if ((unsigned int)s->init_num >= msg_hdr->msg_len)
-                        {
-                        unsigned char *p = (unsigned char *)s->init_buf->data;
-                        unsigned long msg_len = msg_hdr->msg_len;
-
-                        /* reconstruct message header as if it was
-                         * sent in single fragment */
-                        *(p++) = msg_hdr->type;
-                        l2n3(msg_len,p);
-                        s2n (msg_hdr->seq,p);
-                        l2n3(0,p);
-                        l2n3(msg_len,p);
-                        if (s->client_version != DTLS1_BAD_VER)
-                                p       -= DTLS1_HM_HEADER_LENGTH,
-                                msg_len += DTLS1_HM_HEADER_LENGTH;
-
-                        ssl3_finish_mac(s, p, msg_len);
-                        if (s->msg_callback)
-                                s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
-                                        p, msg_len,
-                                        s, s->msg_callback_arg);
-
-                        memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
-
-                        s->d1->handshake_read_seq++;
-                        /* we just read a handshake message from the other side:
-                         * this means that we don't need to retransmit of the
-                         * buffered messages.  
-                         * XDTLS: may be able clear out this
-                         * buffer a little sooner (i.e if an out-of-order
-                         * handshake message/record is received at the record
-                         * layer.  
-                         * XDTLS: exception is that the server needs to
-                         * know that change cipher spec and finished messages
-                         * have been received by the client before clearing this
-                         * buffer.  this can simply be done by waiting for the
-                         * first data  segment, but is there a better way?  */
-                        dtls1_clear_record_buffer(s);
-
-                        s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
-                        return s->init_num;
-                        }
-                else
-                        msg_hdr->frag_off = i;
-                } while(1) ;
+        p = (unsigned char *)s->init_buf->data;
+        msg_len = msg_hdr->msg_len;
+
+        /* reconstruct message header */
+        *(p++) = msg_hdr->type;
+        l2n3(msg_len,p);
+        s2n (msg_hdr->seq,p);
+        l2n3(0,p);
+        l2n3(msg_len,p);
+        if (s->version != DTLS1_BAD_VER) {
+                p       -= DTLS1_HM_HEADER_LENGTH;
+                msg_len += DTLS1_HM_HEADER_LENGTH;
+        }
+
+        ssl3_finish_mac(s, p, msg_len);
+        if (s->msg_callback)
+                s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
+                        p, msg_len,
+                        s, s->msg_callback_arg);
+
+        memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
+
+        s->d1->handshake_read_seq++;
+        /* we just read a handshake message from the other side:
+         * this means that we don't need to retransmit of the
+         * buffered messages.  
+         * XDTLS: may be able clear out this
+         * buffer a little sooner (i.e if an out-of-order
+         * handshake message/record is received at the record
+         * layer.  
+         * XDTLS: exception is that the server needs to
+         * know that change cipher spec and finished messages
+         * have been received by the client before clearing this
+         * buffer.  this can simply be done by waiting for the
+         * first data  segment, but is there a better way?  */
+        dtls1_clear_record_buffer(s);
+
+        s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+        return s->init_num;
 
 f_err:
         ssl3_send_alert(s,SSL3_AL_FATAL,al);
@@ -474,7 +514,7 @@ static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max
                 {
                 /* msg_len is limited to 2^24, but is effectively checked
                  * against max above */
-                if (!BUF_MEM_grow_clean(s->init_buf,(int)msg_len+DTLS1_HM_HEADER_LENGTH))
+                if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH))
                         {
                         SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB);
                         return SSL_AD_INTERNAL_ERROR;
@@ -516,9 +556,14 @@ dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
                 return 0;
 
         frag = (hm_fragment *)item->data;
+        
+        /* Don't return if reassembly still in progress */
+        if (frag->reassembly != NULL)
+                return 0;
 
         if ( s->d1->handshake_read_seq == frag->msg_header.seq)
                 {
+                unsigned long frag_len = frag->msg_header.frag_len;
                 pqueue_pop(s->d1->buffered_messages);
 
                 al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
@@ -536,7 +581,7 @@ dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
                 if (al==0)
                         {
                         *ok = 1;
-                        return frag->msg_header.frag_len;
+                        return frag_len;
                         }
 
                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
@@ -550,18 +595,50 @@ dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
 
 
 static int
-dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
-{
-        int i=-1;
+dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+        {
         hm_fragment *frag = NULL;
         pitem *item = NULL;
-        PQ_64BIT seq64;
-        unsigned long frag_len = msg_hdr->frag_len;
+        int i = -1, is_complete;
+        unsigned char seq64be[8];
+        unsigned long frag_len = msg_hdr->frag_len, max_len;
 
         if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
                 goto err;
 
-        if (msg_hdr->seq <= s->d1->handshake_read_seq)
+        /* Determine maximum allowed message size. Depends on (user set)
+         * maximum certificate length, but 16k is minimum.
+         */
+        if (DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH < s->max_cert_list)
+                max_len = s->max_cert_list;
+        else
+                max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
+
+        if ((msg_hdr->frag_off+frag_len) > max_len)
+                goto err;
+
+        /* Try to find item in queue */
+        memset(seq64be,0,sizeof(seq64be));
+        seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
+        seq64be[7] = (unsigned char) msg_hdr->seq;
+        item = pqueue_find(s->d1->buffered_messages, seq64be);
+
+        if (item == NULL)
+                {
+                frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
+                if ( frag == NULL)
+                        goto err;
+                memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
+                frag->msg_header.frag_len = frag->msg_header.msg_len;
+                frag->msg_header.frag_off = 0;
+                }
+        else
+                frag = (hm_fragment*) item->data;
+
+        /* If message is already reassembled, this must be a
+         * retransmit and can be dropped.
+         */
+        if (frag->reassembly == NULL)
                 {
                 unsigned char devnull [256];
 
@@ -573,32 +650,128 @@ dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
                         if (i<=0) goto err;
                         frag_len -= i;
                         }
+                return DTLS1_HM_FRAGMENT_RETRY;
                 }
 
-        frag = dtls1_hm_fragment_new(frag_len);
-        if ( frag == NULL)
+        /* read the body of the fragment (header has already been read */
+        i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
+                frag->fragment + msg_hdr->frag_off,frag_len,0);
+        if (i<=0 || (unsigned long)i!=frag_len)
                 goto err;
 
-        memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
+        RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
+                            (long)(msg_hdr->frag_off + frag_len));
 
-        if (frag_len)
+        RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
+                                   is_complete);
+
+        if (is_complete)
+                {
+                OPENSSL_free(frag->reassembly);
+                frag->reassembly = NULL;
+                }
+
+        if (item == NULL)
                 {
-                /* read the body of the fragment (header has already been read */
-                i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
-                        frag->fragment,frag_len,0);
-                if (i<=0 || (unsigned long)i!=frag_len)
+                memset(seq64be,0,sizeof(seq64be));
+                seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
+                seq64be[7] = (unsigned char)(msg_hdr->seq);
+
+                item = pitem_new(seq64be, frag);
+                if (item == NULL)
+                        {
                         goto err;
+                        i = -1;
+                        }
+
+                pqueue_insert(s->d1->buffered_messages, item);
                 }
 
-        pq_64bit_init(&seq64);
-        pq_64bit_assign_word(&seq64, msg_hdr->seq);
+        return DTLS1_HM_FRAGMENT_RETRY;
+
+err:
+        if (frag != NULL) dtls1_hm_fragment_free(frag);
+        if (item != NULL) OPENSSL_free(item);
+        *ok = 0;
+        return i;
+        }
+
 
-        item = pitem_new(seq64, frag);
-        pq_64bit_free(&seq64);
-        if ( item == NULL)
+static int
+dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+{
+        int i=-1;
+        hm_fragment *frag = NULL;
+        pitem *item = NULL;
+        unsigned char seq64be[8];
+        unsigned long frag_len = msg_hdr->frag_len;
+
+        if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
                 goto err;
 
-        pqueue_insert(s->d1->buffered_messages, item);
+        /* Try to find item in queue, to prevent duplicate entries */
+        memset(seq64be,0,sizeof(seq64be));
+        seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
+        seq64be[7] = (unsigned char) msg_hdr->seq;
+        item = pqueue_find(s->d1->buffered_messages, seq64be);
+
+        /* If we already have an entry and this one is a fragment,
+         * don't discard it and rather try to reassemble it.
+         */
+        if (item != NULL && frag_len < msg_hdr->msg_len)
+                item = NULL;
+
+        /* Discard the message if sequence number was already there, is
+         * too far in the future, already in the queue or if we received
+         * a FINISHED before the SERVER_HELLO, which then must be a stale
+         * retransmit.
+         */
+        if (msg_hdr->seq <= s->d1->handshake_read_seq ||
+                msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
+                (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
+                {
+                unsigned char devnull [256];
+
+                while (frag_len)
+                        {
+                        i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
+                                devnull,
+                                frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
+                        if (i<=0) goto err;
+                        frag_len -= i;
+                        }
+                }
+        else
+                {
+                if (frag_len && frag_len < msg_hdr->msg_len)
+                        return dtls1_reassemble_fragment(s, msg_hdr, ok);
+
+                frag = dtls1_hm_fragment_new(frag_len, 0);
+                if ( frag == NULL)
+                        goto err;
+
+                memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
+
+                if (frag_len)
+                        {
+                        /* read the body of the fragment (header has already been read */
+                        i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
+                                frag->fragment,frag_len,0);
+                        if (i<=0 || (unsigned long)i!=frag_len)
+                                goto err;
+                        }
+
+                memset(seq64be,0,sizeof(seq64be));
+                seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
+                seq64be[7] = (unsigned char)(msg_hdr->seq);
+
+                item = pitem_new(seq64be, frag);
+                if ( item == NULL)
+                        goto err;
+
+                pqueue_insert(s->d1->buffered_messages, item);
+                }
+
         return DTLS1_HM_FRAGMENT_RETRY;
 
 err:
@@ -613,14 +786,14 @@ static long
 dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
         {
         unsigned char wire[DTLS1_HM_HEADER_LENGTH];
-        unsigned long l, frag_off, frag_len;
+        unsigned long len, frag_off, frag_len;
         int i,al;
         struct hm_header_st msg_hdr;
 
         /* see if we have the required fragment already */
         if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
                 {
-                if (*ok)        s->init_num += frag_len;
+                if (*ok)        s->init_num = frag_len;
                 return frag_len;
                 }
 
@@ -645,10 +818,13 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
         if ( msg_hdr.seq != s->d1->handshake_read_seq)
                 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
 
-        l = msg_hdr.msg_len;
+        len = msg_hdr.msg_len;
         frag_off = msg_hdr.frag_off;
         frag_len = msg_hdr.frag_len;
 
+        if (frag_len && frag_len < len)
+                return dtls1_reassemble_fragment(s, &msg_hdr, ok);
+
         if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
                 wire[0] == SSL3_MT_HELLO_REQUEST)
                 {
@@ -708,7 +884,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
          * s->init_buf->data, but as a counter summing up fragments'
          * lengths: as soon as they sum up to handshake packet
          * length, we assume we have got all the fragments. */
-        s->init_num += frag_len;
+        s->init_num = frag_len;
         return frag_len;
 
 f_err:
@@ -731,14 +907,30 @@ int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 
                 i=s->method->ssl3_enc->final_finish_mac(s,
-                        &(s->s3->finish_dgst1),
-                        &(s->s3->finish_dgst2),
                         sender,slen,s->s3->tmp.finish_md);
                 s->s3->tmp.finish_md_len = i;
                 memcpy(p, s->s3->tmp.finish_md, i);
                 p+=i;
                 l=i;
 
+        /* Copy the finished so we can use it for
+         * renegotiation checks
+         */
+        if(s->type == SSL_ST_CONNECT)
+                {
+                OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
+                memcpy(s->s3->previous_client_finished, 
+                       s->s3->tmp.finish_md, i);
+                s->s3->previous_client_finished_len=i;
+                }
+        else
+                {
+                OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
+                memcpy(s->s3->previous_server_finished, 
+                       s->s3->tmp.finish_md, i);
+                s->s3->previous_server_finished_len=i;
+                }
+
 #ifdef OPENSSL_SYS_WIN16
                 /* MSVC 1.5 does not clear the top bytes of the word unless
                  * I do this.
@@ -779,12 +971,11 @@ int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
                 s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
                 s->init_num=DTLS1_CCS_HEADER_LENGTH;
 
-                if (s->client_version == DTLS1_BAD_VER)
-                        {
+                if (s->version == DTLS1_BAD_VER) {
                         s->d1->next_handshake_write_seq++;
                         s2n(s->d1->handshake_write_seq,p);
                         s->init_num+=2;
-                        }
+                }
 
                 s->init_off=0;
 
@@ -801,14 +992,30 @@ int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
         return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
         }
 
+static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
+        {
+        int n;
+        unsigned char *p;
+
+        n=i2d_X509(x,NULL);
+        if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
+                {
+                SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
+                return 0;
+                }
+        p=(unsigned char *)&(buf->data[*l]);
+        l2n3(n,p);
+        i2d_X509(x,&p);
+        *l+=n+3;
+
+        return 1;
+        }
 unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
         {
         unsigned char *p;
-        int n,i;
+        int i;
         unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH;
         BUF_MEM *buf;
-        X509_STORE_CTX xs_ctx;
-        X509_OBJECT obj;
 
         /* TLSv1 sends a chain with nothing in it, instead of an alert */
         buf=s->init_buf;
@@ -819,54 +1026,35 @@ unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
                 }
         if (x != NULL)
                 {
-                if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
-                        {
-                        SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
-                        return(0);
-                        }
-
-                for (;;)
-                        {
-                        n=i2d_X509(x,NULL);
-                        if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
-                                {
-                                SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
-                                return(0);
-                                }
-                        p=(unsigned char *)&(buf->data[l]);
-                        l2n3(n,p);
-                        i2d_X509(x,&p);
-                        l+=n+3;
-                        if (X509_NAME_cmp(X509_get_subject_name(x),
-                                X509_get_issuer_name(x)) == 0) break;
-
-                        i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
-                                X509_get_issuer_name(x),&obj);
-                        if (i <= 0) break;
-                        x=obj.data.x509;
-                        /* Count is one too high since the X509_STORE_get uped the
-                         * ref count */
-                        X509_free(x);
-                        }
-
-                X509_STORE_CTX_cleanup(&xs_ctx);
-                }
-
-        /* Thawte special :-) */
-        if (s->ctx->extra_certs != NULL)
+                X509_STORE_CTX xs_ctx;
+
+                if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
+                        {
+                        SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
+                        return(0);
+                        }
+  
+                X509_verify_cert(&xs_ctx);
+                /* Don't leave errors in the queue */
+                ERR_clear_error();
+                for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
+                        {
+                        x = sk_X509_value(xs_ctx.chain, i);
+
+                        if (!dtls1_add_cert_to_buf(buf, &l, x))
+                                {
+                                X509_STORE_CTX_cleanup(&xs_ctx);
+                                return 0;
+                                }
+                        }
+                X509_STORE_CTX_cleanup(&xs_ctx);
+                }
+        /* Thawte special :-) */
         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
                 {
                 x=sk_X509_value(s->ctx->extra_certs,i);
-                n=i2d_X509(x,NULL);
-                if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
-                        {
-                        SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
-                        return(0);
-                        }
-                p=(unsigned char *)&(buf->data[l]);
-                l2n3(n,p);
-                i2d_X509(x,&p);
-                l+=n+3;
+                if (!dtls1_add_cert_to_buf(buf, &l, x))
+                        return 0;
                 }
 
         l-= (3 + DTLS1_HM_HEADER_LENGTH);
@@ -883,18 +1071,13 @@ unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
 
 int dtls1_read_failed(SSL *s, int code)
         {
-        DTLS1_STATE *state;
-        BIO *bio;
-        int send_alert = 0;
-
         if ( code > 0)
                 {
                 fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
                 return 1;
                 }
 
-        bio = SSL_get_rbio(s);
-        if ( ! BIO_dgram_recv_timedout(bio))
+        if (!dtls1_is_timer_expired(s))
                 {
                 /* not a timeout, none of our business, 
                    let higher layers handle this.  in fact it's probably an error */
@@ -907,23 +1090,6 @@ int dtls1_read_failed(SSL *s, int code)
                 return code;
                 }
 
-        state = s->d1;
-        state->timeout.num_alerts++;
-        if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
-                {
-                /* fail the connection, enough alerts have been sent */
-                SSLerr(SSL_F_DTLS1_READ_FAILED,SSL_R_READ_TIMEOUT_EXPIRED);
-                return 0;
-                }
-
-        state->timeout.read_timeouts++;
-        if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
-                {
-                send_alert = 1;
-                state->timeout.read_timeouts = 1;
-                }
-
-
 #if 0 /* for now, each alert contains only one record number */
         item = pqueue_peek(state->rcvd_records);
         if ( item )
@@ -934,16 +1100,29 @@ int dtls1_read_failed(SSL *s, int code)
 #endif
 
 #if 0  /* no more alert sending, just retransmit the last set of messages */
-                if ( send_alert)
-                        ssl3_send_alert(s,SSL3_AL_WARNING,
-                                DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
+        if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT)
+                ssl3_send_alert(s,SSL3_AL_WARNING,
+                        DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 #endif
 
-        return dtls1_retransmit_buffered_messages(s) ;
+        return dtls1_handle_timeout(s);
         }
 
+int
+dtls1_get_queue_priority(unsigned short seq, int is_ccs)
+        {
+        /* The index of the retransmission queue actually is the message sequence number,
+         * since the queue only contains messages of a single handshake. However, the
+         * ChangeCipherSpec has no message sequence number and so using only the sequence
+         * will result in the CCS and Finished having the same index. To prevent this,
+         * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
+         * This does not only differ CSS and Finished, it also maintains the order of the
+         * index (important for priority queues) and fits in the unsigned short variable.
+         */     
+        return seq * 2 - is_ccs;
+        }
 
-static int
+int
 dtls1_retransmit_buffered_messages(SSL *s)
         {
         pqueue sent = s->d1->sent_messages;
@@ -957,8 +1136,9 @@ dtls1_retransmit_buffered_messages(SSL *s)
         for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter))
                 {
                 frag = (hm_fragment *)item->data;
-                if ( dtls1_retransmit_message(s, frag->msg_header.seq, 0, &found) <= 0 &&
-                        found)
+                        if ( dtls1_retransmit_message(s,
+                                (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs),
+                                0, &found) <= 0 && found)
                         {
                         fprintf(stderr, "dtls1_retransmit_message() failed\n");
                         return -1;
@@ -973,22 +1153,20 @@ dtls1_buffer_message(SSL *s, int is_ccs)
         {
         pitem *item;
         hm_fragment *frag;
-        PQ_64BIT seq64;
-        unsigned int epoch = s->d1->w_epoch;
+        unsigned char seq64be[8];
 
         /* this function is called immediately after a message has 
          * been serialized */
         OPENSSL_assert(s->init_off == 0);
 
-        frag = dtls1_hm_fragment_new(s->init_num);
+        frag = dtls1_hm_fragment_new(s->init_num, 0);
 
         memcpy(frag->fragment, s->init_buf->data, s->init_num);
 
         if ( is_ccs)
                 {
                 OPENSSL_assert(s->d1->w_msg_hdr.msg_len + 
-                        DTLS1_CCS_HEADER_LENGTH <= (unsigned int)s->init_num);
-                epoch++;
+                               ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num);
                 }
         else
                 {
@@ -1003,11 +1181,20 @@ dtls1_buffer_message(SSL *s, int is_ccs)
         frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
         frag->msg_header.is_ccs = is_ccs;
 
-        pq_64bit_init(&seq64);
-        pq_64bit_assign_word(&seq64, epoch<<16 | frag->msg_header.seq);
-
-        item = pitem_new(seq64, frag);
-        pq_64bit_free(&seq64);
+        /* save current state*/
+        frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
+        frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
+        frag->msg_header.saved_retransmit_state.compress = s->compress;
+        frag->msg_header.saved_retransmit_state.session = s->session;
+        frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
+        
+        memset(seq64be,0,sizeof(seq64be));
+        seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
+                                                                                                                  frag->msg_header.is_ccs)>>8);
+        seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
+                                                                                                                  frag->msg_header.is_ccs));
+
+        item = pitem_new(seq64be, frag);
         if ( item == NULL)
                 {
                 dtls1_hm_fragment_free(frag);
@@ -1033,7 +1220,9 @@ dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
         pitem *item;
         hm_fragment *frag ;
         unsigned long header_length;
-        PQ_64BIT seq64;
+        unsigned char seq64be[8];
+        struct dtls1_retransmit_state saved_state;
+        unsigned char save_write_sequence[8];
 
         /*
           OPENSSL_assert(s->init_num == 0);
@@ -1041,11 +1230,11 @@ dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
          */
 
         /* XDTLS:  the requested message ought to be found, otherwise error */
-        pq_64bit_init(&seq64);
-        pq_64bit_assign_word(&seq64, seq);
+        memset(seq64be,0,sizeof(seq64be));
+        seq64be[6] = (unsigned char)(seq>>8);
+        seq64be[7] = (unsigned char)seq;
 
-        item = pqueue_find(s->d1->sent_messages, seq64);
-        pq_64bit_free(&seq64);
+        item = pqueue_find(s->d1->sent_messages, seq64be);
         if ( item == NULL)
                 {
                 fprintf(stderr, "retransmit:  message %d non-existant\n", seq);
@@ -1069,9 +1258,45 @@ dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
                 frag->msg_header.msg_len, frag->msg_header.seq, 0, 
                 frag->msg_header.frag_len);
 
+        /* save current state */
+        saved_state.enc_write_ctx = s->enc_write_ctx;
+        saved_state.write_hash = s->write_hash;
+        saved_state.compress = s->compress;
+        saved_state.session = s->session;
+        saved_state.epoch = s->d1->w_epoch;
+        saved_state.epoch = s->d1->w_epoch;
+        
         s->d1->retransmitting = 1;
+        
+        /* restore state in which the message was originally sent */
+        s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
+        s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
+        s->compress = frag->msg_header.saved_retransmit_state.compress;
+        s->session = frag->msg_header.saved_retransmit_state.session;
+        s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
+        
+        if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
+        {
+                memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
+                memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence));
+        }
+        
         ret = dtls1_do_write(s, frag->msg_header.is_ccs ? 
-                SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
+                                                 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
+        
+        /* restore current state */
+        s->enc_write_ctx = saved_state.enc_write_ctx;
+        s->write_hash = saved_state.write_hash;
+        s->compress = saved_state.compress;
+        s->session = saved_state.session;
+        s->d1->w_epoch = saved_state.epoch;
+        
+        if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
+        {
+                memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
+                memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence));
+        }
+
         s->d1->retransmitting = 0;
 
         (void)BIO_flush(SSL_get_wbio(s));
@@ -1160,7 +1385,7 @@ dtls1_min_mtu(void)
 static unsigned int 
 dtls1_guess_mtu(unsigned int curr_mtu)
         {
-        size_t i;
+        unsigned int i;
 
         if ( curr_mtu == 0 )
                 return g_probable_mtu[0] ;