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CURLOPT_SSL_OPTIONS: added

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Allow an appliction to set libcurl specific SSL options. The first and
only options supported right now is CURLSSLOPT_ALLOW_BEAST.

It will make libcurl to disable any work-arounds the underlying SSL
library may have to address a known security flaw in the SSL3 and TLS1.0
protocol versions.

This is a reaction to us unconditionally removing that behavior after
this security advisory:

http://curl.haxx.se/docs/adv_20120124B.html

... it did however cause a lot of programs to fail because of old
servers not liking this work-around. Now programs can opt to decrease
the security in order to interoperate with old servers better.
This commit is contained in:
Daniel Stenberg
2012-02-06 22:12:06 +01:00
parent 2a266c1c7c
commit 2a699bc6e9
6 changed files with 40 additions and 6 deletions
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5
lib/ssluse.c
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@@ -1566,7 +1566,10 @@ ossl_connect_step1(struct connectdata *conn,
#endif
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
ctx_options &= ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
/* unless the user explicitly ask to allow the protocol vulnerability we
use the work-around */
if(!conn->data->set.ssl_enable_beast)
ctx_options &= ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
#endif
/* disable SSLv2 in the default case (i.e. allow SSLv3 and TLSv1) */