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387d98c |
diff -up openssl-0.9.8k/crypto/pqueue/pqueue.c.dtls-dos openssl-0.9.8k/crypto/pqueue/pqueue.c
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387d98c |
--- openssl-0.9.8k/crypto/pqueue/pqueue.c.dtls-dos 2005-06-28 14:53:33.000000000 +0200
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387d98c |
+++ openssl-0.9.8k/crypto/pqueue/pqueue.c 2009-05-21 18:26:29.000000000 +0200
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387d98c |
@@ -234,3 +234,17 @@ pqueue_next(pitem **item)
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387d98c |
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387d98c |
return ret;
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387d98c |
}
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387d98c |
+
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387d98c |
+int
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387d98c |
+pqueue_size(pqueue_s *pq)
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387d98c |
+{
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387d98c |
+ pitem *item = pq->items;
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387d98c |
+ int count = 0;
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387d98c |
+
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387d98c |
+ while(item != NULL)
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387d98c |
+ {
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387d98c |
+ count++;
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387d98c |
+ item = item->next;
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387d98c |
+ }
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387d98c |
+ return count;
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387d98c |
+}
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387d98c |
diff -up openssl-0.9.8k/crypto/pqueue/pqueue.h.dtls-dos openssl-0.9.8k/crypto/pqueue/pqueue.h
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387d98c |
--- openssl-0.9.8k/crypto/pqueue/pqueue.h.dtls-dos 2009-04-21 11:43:58.000000000 +0200
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387d98c |
+++ openssl-0.9.8k/crypto/pqueue/pqueue.h 2009-05-21 18:26:29.000000000 +0200
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387d98c |
@@ -91,5 +91,6 @@ pitem *pqueue_iterator(pqueue pq);
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387d98c |
pitem *pqueue_next(piterator *iter);
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387d98c |
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387d98c |
void pqueue_print(pqueue pq);
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387d98c |
+int pqueue_size(pqueue pq);
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387d98c |
|
|
|
387d98c |
#endif /* ! HEADER_PQUEUE_H */
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|
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387d98c |
diff -up openssl-0.9.8k/ssl/d1_both.c.dtls-dos openssl-0.9.8k/ssl/d1_both.c
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387d98c |
--- openssl-0.9.8k/ssl/d1_both.c.dtls-dos 2007-10-17 23:17:49.000000000 +0200
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387d98c |
+++ openssl-0.9.8k/ssl/d1_both.c 2009-05-21 18:26:29.000000000 +0200
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387d98c |
@@ -519,6 +519,7 @@ dtls1_retrieve_buffered_fragment(SSL *s,
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387d98c |
|
|
|
387d98c |
if ( s->d1->handshake_read_seq == frag->msg_header.seq)
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|
|
387d98c |
{
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|
|
387d98c |
+ unsigned long frag_len = frag->msg_header.frag_len;
|
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|
387d98c |
pqueue_pop(s->d1->buffered_messages);
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|
|
387d98c |
|
|
|
387d98c |
al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
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|
|
387d98c |
@@ -536,7 +537,7 @@ dtls1_retrieve_buffered_fragment(SSL *s,
|
|
|
387d98c |
if (al==0)
|
|
|
387d98c |
{
|
|
|
387d98c |
*ok = 1;
|
|
|
387d98c |
- return frag->msg_header.frag_len;
|
|
|
387d98c |
+ return frag_len;
|
|
|
387d98c |
}
|
|
|
387d98c |
|
|
|
387d98c |
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
|
387d98c |
@@ -561,7 +562,16 @@ dtls1_process_out_of_seq_message(SSL *s,
|
|
|
387d98c |
if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
|
|
|
387d98c |
goto err;
|
|
|
387d98c |
|
|
|
387d98c |
- if (msg_hdr->seq <= s->d1->handshake_read_seq)
|
|
|
387d98c |
+ /* Try to find item in queue, to prevent duplicate entries */
|
|
|
387d98c |
+ pq_64bit_init(&seq64);
|
|
|
387d98c |
+ pq_64bit_assign_word(&seq64, msg_hdr->seq);
|
|
|
387d98c |
+ item = pqueue_find(s->d1->buffered_messages, seq64);
|
|
|
387d98c |
+ pq_64bit_free(&seq64);
|
|
|
387d98c |
+
|
|
|
387d98c |
+ /* Discard the message if sequence number was already there, is
|
|
|
387d98c |
+ * too far in the future or the fragment is already in the queue */
|
|
|
387d98c |
+ if (msg_hdr->seq <= s->d1->handshake_read_seq ||
|
|
|
387d98c |
+ msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL)
|
|
|
387d98c |
{
|
|
|
387d98c |
unsigned char devnull [256];
|
|
|
387d98c |
|
|
|
387d98c |
diff -up openssl-0.9.8k/ssl/d1_pkt.c.dtls-dos openssl-0.9.8k/ssl/d1_pkt.c
|
|
|
387d98c |
--- openssl-0.9.8k/ssl/d1_pkt.c.dtls-dos 2009-04-21 11:44:02.000000000 +0200
|
|
|
387d98c |
+++ openssl-0.9.8k/ssl/d1_pkt.c 2009-05-21 18:26:29.000000000 +0200
|
|
|
387d98c |
@@ -167,6 +167,10 @@ dtls1_buffer_record(SSL *s, record_pqueu
|
|
|
387d98c |
DTLS1_RECORD_DATA *rdata;
|
|
|
387d98c |
pitem *item;
|
|
|
387d98c |
|
|
|
387d98c |
+ /* Limit the size of the queue to prevent DOS attacks */
|
|
|
387d98c |
+ if (pqueue_size(queue->q) >= 100)
|
|
|
387d98c |
+ return 0;
|
|
|
387d98c |
+
|
|
|
387d98c |
rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
|
|
|
387d98c |
item = pitem_new(priority, rdata);
|
|
|
387d98c |
if (rdata == NULL || item == NULL)
|