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-rw-r--r--lib/ssluse.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/lib/ssluse.c b/lib/ssluse.c
index 975ab8cf6..b09ba6db7 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -1425,6 +1425,7 @@ ossl_connect_step1(struct connectdata *conn,
X509_LOOKUP *lookup=NULL;
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
+ long ctx_options;
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
bool sni;
#ifdef ENABLE_IPV6
@@ -1530,20 +1531,33 @@ ossl_connect_step1(struct connectdata *conn,
If someone writes an application with libcurl and openssl who wants to
enable the feature, one can do this in the SSL callback.
+ SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG option enabling allowed proper
+ interoperability with web server Netscape Enterprise Server 2.0.1 which
+ was released back in 1996.
+
+ Due to CVE-2010-4180, option SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG has
+ become ineffective as of OpenSSL 0.9.8q and 1.0.0c. In order to mitigate
+ CVE-2010-4180 when using previous OpenSSL versions we no longer enable
+ this option regardless of OpenSSL version and SSL_OP_ALL definition.
*/
+
+ ctx_options = SSL_OP_ALL;
+
#ifdef SSL_OP_NO_TICKET
- /* expect older openssl releases to not have this define so only use it if
- present */
-#define CURL_CTX_OPTIONS SSL_OP_ALL|SSL_OP_NO_TICKET
-#else
-#define CURL_CTX_OPTIONS SSL_OP_ALL
+ ctx_options |= SSL_OP_NO_TICKET;
#endif
- SSL_CTX_set_options(connssl->ctx, CURL_CTX_OPTIONS);
+#if defined(SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && \
+ (SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG == 0x00000008L)
+ /* mitigate CVE-2010-4180 */
+ ctx_options &= ~SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG;
+#endif
/* disable SSLv2 in the default case (i.e. allow SSLv3 and TLSv1) */
if(data->set.ssl.version == CURL_SSLVERSION_DEFAULT)
- SSL_CTX_set_options(connssl->ctx, SSL_OP_NO_SSLv2);
+ ctx_options |= SSL_OP_NO_SSLv2;
+
+ SSL_CTX_set_options(connssl->ctx, ctx_options);
#if 0
/*