Updated ics-openvpn to rev924.

1 files changed, 52 insertions, 33 deletions

diff --git a/ics-openvpn-stripped/main/openssl/ssl/d1_both.c b/ics-openvpn-stripped/main/openssl/ssl/d1_both.c
index 04aa2310..2e4250fc 100644
--- a/ics-openvpn-stripped/main/openssl/ssl/d1_both.c
+++ b/ics-openvpn-stripped/main/openssl/ssl/d1_both.c
@@ -587,29 +587,32 @@ dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
 		return 0;
 	}
 
+/* dtls1_max_handshake_message_len returns the maximum number of bytes
+ * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but may
+ * be greater if the maximum certificate list size requires it. */
+static unsigned long dtls1_max_handshake_message_len(const SSL *s)
+	{
+	unsigned long max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
+	if (max_len < (unsigned long)s->max_cert_list)
+		return s->max_cert_list;
+	return max_len;
+	}
 
 static int
-dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+dtls1_reassemble_fragment(SSL *s, const struct hm_header_st* msg_hdr, int *ok)
 	{
 	hm_fragment *frag = NULL;
 	pitem *item = NULL;
 	int i = -1, is_complete;
 	unsigned char seq64be[8];
-	unsigned long frag_len = msg_hdr->frag_len, max_len;
+	unsigned long frag_len = msg_hdr->frag_len;
 
-	if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
+	if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len ||
+	    msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
 		goto err;
 
-	/* 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;
+	if (frag_len == 0)
+		return DTLS1_HM_FRAGMENT_RETRY;
 
 	/* Try to find item in queue */
 	memset(seq64be,0,sizeof(seq64be));
@@ -639,7 +642,8 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 
 
 	/* If message is already reassembled, this must be a
-	 * retransmit and can be dropped.
+	 * retransmit and can be dropped. In this case item != NULL and so frag
+	 * does not need to be freed.
 	 */
 	if (frag->reassembly == NULL)
 		{
@@ -659,7 +663,9 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 	/* 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)
+	if ((unsigned long)i!=frag_len)
+		i=-1;
+	if (i<=0)
 		goto err;
 
 	RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
@@ -676,10 +682,6 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 
 	if (item == NULL)
 		{
-		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)
 			{
@@ -687,21 +689,25 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 			goto err;
 			}
 
-		pqueue_insert(s->d1->buffered_messages, item);
+		item = pqueue_insert(s->d1->buffered_messages, item);
+		/* pqueue_insert fails iff a duplicate item is inserted.
+		 * However, |item| cannot be a duplicate. If it were,
+		 * |pqueue_find|, above, would have returned it and control
+		 * would never have reached this branch. */
+		OPENSSL_assert(item != NULL);
 		}
 
 	return DTLS1_HM_FRAGMENT_RETRY;
 
 err:
-	if (frag != NULL) dtls1_hm_fragment_free(frag);
-	if (item != NULL) OPENSSL_free(item);
+	if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
 	*ok = 0;
 	return i;
 	}
 
 
 static int
-dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+dtls1_process_out_of_seq_message(SSL *s, const struct hm_header_st* msg_hdr, int *ok)
 {
 	int i=-1;
 	hm_fragment *frag = NULL;
@@ -721,7 +727,7 @@ dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 	/* 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)
+	if (item != NULL && frag_len != msg_hdr->msg_len)
 		item = NULL;
 
 	/* Discard the message if sequence number was already there, is
@@ -746,9 +752,12 @@ dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 		}
 	else
 		{
-		if (frag_len && frag_len < msg_hdr->msg_len)
+		if (frag_len != msg_hdr->msg_len)
 			return dtls1_reassemble_fragment(s, msg_hdr, ok);
 
+		if (frag_len > dtls1_max_handshake_message_len(s))
+			goto err;
+
 		frag = dtls1_hm_fragment_new(frag_len, 0);
 		if ( frag == NULL)
 			goto err;
@@ -760,26 +769,31 @@ dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 			/* 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)
+			if ((unsigned long)i!=frag_len)
+				i = -1;
+			if (i<=0)
 				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);
+		item = pqueue_insert(s->d1->buffered_messages, item);
+		/* pqueue_insert fails iff a duplicate item is inserted.
+		 * However, |item| cannot be a duplicate. If it were,
+		 * |pqueue_find|, above, would have returned it. Then, either
+		 * |frag_len| != |msg_hdr->msg_len| in which case |item| is set
+		 * to NULL and it will have been processed with
+		 * |dtls1_reassemble_fragment|, above, or the record will have
+		 * been discarded. */
+		OPENSSL_assert(item != NULL);
 		}
 
 	return DTLS1_HM_FRAGMENT_RETRY;
 
 err:
-	if ( frag != NULL) dtls1_hm_fragment_free(frag);
-	if ( item != NULL) OPENSSL_free(item);
+	if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
 	*ok = 0;
 	return i;
 	}
@@ -1180,6 +1194,8 @@ dtls1_buffer_message(SSL *s, int is_ccs)
 	OPENSSL_assert(s->init_off == 0);
 
 	frag = dtls1_hm_fragment_new(s->init_num, 0);
+	if (!frag)
+		return 0;
 
 	memcpy(frag->fragment, s->init_buf->data, s->init_num);
 
@@ -1476,6 +1492,9 @@ dtls1_process_heartbeat(SSL *s)
 	/* Read type and payload length first */
 	if (1 + 2 + 16 > s->s3->rrec.length)
 		return 0; /* silently discard */
+	if (s->s3->rrec.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 > s->s3->rrec.length)