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PR: 2006

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Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>
Approved by: steve@openssl.org

Do not use multiple DTLS records for a single user message
This commit is contained in:
Dr. Stephen Henson 2009-08-26 11:51:57 +00:00
parent 19c5314f28
commit 480b9e5d29
3 changed files with 10 additions and 59 deletions
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67
ssl/d1_pkt.c
View File

@ -1257,7 +1257,6 @@ err:
int
dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
{
unsigned int n,tot;
int i;
if (SSL_in_init(s) && !s->in_handshake)
@ -1271,31 +1270,14 @@ dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
}
}
tot = s->s3->wnum;
n = len - tot;
while( n)
if (len > SSL3_RT_MAX_PLAIN_LENGTH)
{
/* dtls1_write_bytes sends one record at a time, sized according to
* the currently known MTU */
i = dtls1_write_bytes(s, type, buf_, len);
if (i <= 0) return i;
if ((i == (int)n) ||
(type == SSL3_RT_APPLICATION_DATA &&
(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
{
/* next chunk of data should get another prepended empty fragment
* in ciphersuites with known-IV weakness: */
s->s3->empty_fragment_done = 0;
return tot+i;
}
tot += i;
n-=i;
SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
return -1;
}
return tot;
i = dtls1_write_bytes(s, type, buf_, len);
return i;
}
@ -1336,46 +1318,13 @@ have_handshake_fragment(SSL *s, int type, unsigned char *buf,
/* Call this to write data in records of type 'type'
* It will return <= 0 if not all data has been sent or non-blocking IO.
*/
int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
int dtls1_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 mtu;
OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
s->rwstate=SSL_NOTHING;
tot=s->s3->wnum;
n=(len-tot);
/* handshake layer figures out MTU for itself, but data records
* are also sent through this interface, so need to figure out MTU */
#if 0
mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
mtu += DTLS1_HM_HEADER_LENGTH; /* HM already inserted */
#endif
mtu = s->d1->mtu;
if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
mtu = SSL3_RT_MAX_PLAIN_LENGTH;
if (n > mtu)
nw=mtu;
else
nw=n;
i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
if (i <= 0)
{
s->s3->wnum=tot;
return i;
}
if ( (int)s->s3->wnum + i == len)
s->s3->wnum = 0;
else
s->s3->wnum += i;
i=do_dtls1_write(s, type, buf, len, 0);
return i;
}

1
ssl/ssl.h
View File

@ -2211,6 +2211,7 @@ void ERR_load_SSL_strings(void);
#define SSL_R_TLSV1_CERTIFICATE_UNOBTAINABLE 1111
#define SSL_R_TLSV1_UNRECOGNIZED_NAME 1112
#define SSL_R_TLSV1_UNSUPPORTED_EXTENSION 1110
#define SSL_R_DTLS_MESSAGE_TOO_BIG 1200
#define SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER 232
#define SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST 157
#define SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 233

1
ssl/ssl_err.c
View File

@ -490,6 +490,7 @@ static ERR_STRING_DATA SSL_str_reasons[]=
{ERR_REASON(SSL_R_TLSV1_CERTIFICATE_UNOBTAINABLE),"tlsv1 certificate unobtainable"},
{ERR_REASON(SSL_R_TLSV1_UNRECOGNIZED_NAME),"tlsv1 unrecognized name"},
{ERR_REASON(SSL_R_TLSV1_UNSUPPORTED_EXTENSION),"tlsv1 unsupported extension"},
{ERR_REASON(SSL_R_DTLS_MESSAGE_TOO_BIG),"dtls message too big"},
{ERR_REASON(SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER),"tls client cert req with anon cipher"},
{ERR_REASON(SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST),"tls invalid ecpointformat list"},
{ERR_REASON(SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST),"tls peer did not respond with certificate list"},