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path: root/crypto/openssl/ssl/s3_pkt.c
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Diffstat (limited to 'crypto/openssl/ssl/s3_pkt.c')
-rw-r--r--crypto/openssl/ssl/s3_pkt.c67
1 files changed, 52 insertions, 15 deletions
diff --git a/crypto/openssl/ssl/s3_pkt.c b/crypto/openssl/ssl/s3_pkt.c
index 811a047f9f27..1ec9e6ea46da 100644
--- a/crypto/openssl/ssl/s3_pkt.c
+++ b/crypto/openssl/ssl/s3_pkt.c
@@ -110,6 +110,7 @@
*/
#include <stdio.h>
+#include <limits.h>
#include <errno.h>
#define USE_SOCKETS
#include "ssl_locl.h"
@@ -274,6 +275,12 @@ int ssl3_read_n(SSL *s, int n, int max, int extend)
return(n);
}
+/* MAX_EMPTY_RECORDS defines the number of consecutive, empty records that will
+ * be processed per call to ssl3_get_record. Without this limit an attacker
+ * could send empty records at a faster rate than we can process and cause
+ * ssl3_get_record to loop forever. */
+#define MAX_EMPTY_RECORDS 32
+
/* Call this to get a new input record.
* It will return <= 0 if more data is needed, normally due to an error
* or non-blocking IO.
@@ -294,6 +301,7 @@ static int ssl3_get_record(SSL *s)
short version;
unsigned mac_size, orig_len;
size_t extra;
+ unsigned empty_record_count = 0;
rr= &(s->s3->rrec);
sess=s->session;
@@ -337,7 +345,7 @@ fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
if (version != s->version)
{
SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- if ((s->version & 0xFF00) == (version & 0xFF00))
+ if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
/* Send back error using their minor version number :-) */
s->version = (unsigned short)version;
al=SSL_AD_PROTOCOL_VERSION;
@@ -524,7 +532,17 @@ printf("\n");
s->packet_length=0;
/* just read a 0 length packet */
- if (rr->length == 0) goto again;
+ if (rr->length == 0)
+ {
+ empty_record_count++;
+ if (empty_record_count > MAX_EMPTY_RECORDS)
+ {
+ al=SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_RECORD_TOO_SMALL);
+ goto f_err;
+ }
+ goto again;
+ }
#if 0
fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
@@ -582,10 +600,11 @@ int ssl3_do_compress(SSL *ssl)
int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
{
const unsigned char *buf=buf_;
- unsigned int tot,n,nw;
- int i;
+ unsigned int n,nw;
+ int i,tot;
s->rwstate=SSL_NOTHING;
+ OPENSSL_assert(s->s3->wnum <= INT_MAX);
tot=s->s3->wnum;
s->s3->wnum=0;
@@ -600,6 +619,22 @@ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
}
}
+ /* ensure that if we end up with a smaller value of data to write
+ * out than the the original len from a write which didn't complete
+ * for non-blocking I/O and also somehow ended up avoiding
+ * the check for this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as
+ * it must never be possible to end up with (len-tot) as a large
+ * number that will then promptly send beyond the end of the users
+ * buffer ... so we trap and report the error in a way the user
+ * will notice
+ */
+ if (len < tot)
+ {
+ SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_BAD_LENGTH);
+ return(-1);
+ }
+
+
n=(len-tot);
for (;;)
{
@@ -643,9 +678,6 @@ static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
SSL3_BUFFER *wb=&(s->s3->wbuf);
SSL_SESSION *sess;
- if (wb->buf == NULL)
- if (!ssl3_setup_write_buffer(s))
- return -1;
/* first check if there is a SSL3_BUFFER still being written
* out. This will happen with non blocking IO */
@@ -659,12 +691,12 @@ static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
if (i <= 0)
return(i);
/* if it went, fall through and send more stuff */
- /* we may have released our buffer, so get it again */
- if (wb->buf == NULL)
- if (!ssl3_setup_write_buffer(s))
- return -1;
}
+ if (wb->buf == NULL)
+ if (!ssl3_setup_write_buffer(s))
+ return -1;
+
if (len == 0 && !create_empty_fragment)
return 0;
@@ -826,8 +858,7 @@ static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
wr->length += eivlen;
}
- /* ssl3_enc can only have an error on read */
- s->method->ssl3_enc->enc(s,1);
+ if(s->method->ssl3_enc->enc(s,1)<1) goto err;
/* record length after mac and block padding */
s2n(wr->length,plen);
@@ -955,7 +986,7 @@ int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
if (!ssl3_setup_read_buffer(s))
return(-1);
- if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
+ if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE)) ||
(peek && (type != SSL3_RT_APPLICATION_DATA)))
{
SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
@@ -1474,8 +1505,14 @@ int ssl3_do_change_cipher_spec(SSL *s)
slen=s->method->ssl3_enc->client_finished_label_len;
}
- s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
+ i = s->method->ssl3_enc->final_finish_mac(s,
sender,slen,s->s3->tmp.peer_finish_md);
+ if (i == 0)
+ {
+ SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ s->s3->tmp.peer_finish_md_len = i;
return(1);
}