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authorParménides GV <parmegv@sdf.org>2014-12-12 11:49:24 +0100
committerParménides GV <parmegv@sdf.org>2014-12-12 11:49:24 +0100
commit0e7e4005460964cf8dac080e3d99e1df2a1bdc4d (patch)
tree63fdba4f03bf47b0faa62b9d24cdff9a5a79a8b7 /ics-openvpn-stripped/main/openssl/ssl/d1_both.c
parent61dc26ab57ad4e2dba341998cabec3f411865e46 (diff)
Updated ics-openvpn to rev924.
Diffstat (limited to 'ics-openvpn-stripped/main/openssl/ssl/d1_both.c')
-rw-r--r--ics-openvpn-stripped/main/openssl/ssl/d1_both.c85
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)