On 3/11/15 12:14 AM, Xin Li wrote:
On 3/10/15 23:57, Julian Elischer wrote:
[sorry for reposting but the original copy I got back had been truncated]
libssl has a new "feature"
implemented by:
crypto/openssl/ssl/t1_lib.c
672 /* Add padding to workaround bugs in F5 terminators.
673 * See https://tools.ietf.org/html/draft-agl-tls-padding-03
674 *
675 * NB: because this code works out the length of all
existing
676 * extensions it MUST always appear last.
677 */
678 //if (s->options & SSL_OP_TLSEXT_PADDING)
unfortunatly this makes sendmail incompatible with various email servers
around the world,
including (apparently (ironically (*))) Ironport email gateways.
It fails in TLS handshake.
I hate workarounds of workarounds :(
How about this?
%%%
Index: contrib/sendmail/src/readcf.c
===================================================================
--- contrib/sendmail/src/readcf.c (revision 279857)
+++ contrib/sendmail/src/readcf.c (working copy)
@@ -116,7 +116,7 @@ readcf(cfname, safe, e)
#if STARTTLS
Srv_SSL_Options = SSL_OP_ALL;
- Clt_SSL_Options = SSL_OP_ALL
+ Clt_SSL_Options = SSL_OP_ALL & ~SSL_OP_TLSEXT_PADDING
#ifdef SSL_OP_NO_SSLv2
| SSL_OP_NO_SSLv2
#endif
%%%
that's certainly better.. MY change was to just prove where the
problem was after reading a bit on the web.
The trouble is that that may break mail servers behind F5 appliances.
One wonders if one could only turn it off for every second attempt on
a retry after a failed attempt.
or some other way of not breaking the F5 appliances...
I found I could not talk to my child's school (department of
education) and my bank, over a period of just a week..
I will look to see if I start picking up new failures now (and see how
many F5 appliances there are :-).
Cheers,
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