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Fix DTLS anonymous EC(DH) denial of service

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CVE-2014-3510

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
This commit is contained in:
Emilia Käsper 2014-07-24 22:15:29 +02:00 committed by Matt Caswell
parent fc4f4cdb8b
commit 88ae012c80
2 changed files with 28 additions and 2 deletions
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23
ssl/d1_clnt.c
View File

@ -996,6 +996,13 @@ int dtls1_send_client_key_exchange(SSL *s)
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
if (s->session->sess_cert == NULL)
{
/* We should always have a server certificate with SSL_kRSA. */
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto err;
}
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa=s->session->sess_cert->peer_rsa_tmp;
else
@ -1186,6 +1193,13 @@ int dtls1_send_client_key_exchange(SSL *s)
{
DH *dh_srvr,*dh_clnt;
if (s->session->sess_cert == NULL)
{
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
if (s->session->sess_cert->peer_dh_tmp != NULL)
dh_srvr=s->session->sess_cert->peer_dh_tmp;
else
@ -1245,6 +1259,13 @@ int dtls1_send_client_key_exchange(SSL *s)
int ecdh_clnt_cert = 0;
int field_size = 0;
if (s->session->sess_cert == NULL)
{
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
/* Did we send out the client's
* ECDH share for use in premaster
* computation as part of client certificate?
@ -1720,5 +1741,3 @@ int dtls1_send_client_certificate(SSL *s)
/* SSL3_ST_CW_CERT_D */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
}

7
ssl/s3_clnt.c
View File

@ -2253,6 +2253,13 @@ int ssl3_send_client_key_exchange(SSL *s)
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
if (s->session->sess_cert == NULL)
{
/* We should always have a server certificate with SSL_kRSA. */
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto err;
}
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa=s->session->sess_cert->peer_rsa_tmp;
else