All,
I have applied, commited, and pushed, David's SSL DH options patch supplied privately.

    Constructive comments welcome!

I am presently running the code from this last patch and the update that I previously commited earlier today, and it appears to be working.
    Evidence follows;

--- pre-changes from today - using /etc/c-config.cf

   # These are the hard coded default values, but are show for completeness
   set ssl-protocols -all +TLSV1
   set ssl-cipher-list HIGH:!ADH:!EXP:!LOW:!SSLV2:!SSLV3

---

subject=/CN= --- redacted ---
issuer=/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
---
No client certificate CA names sent
---
SSL handshake has read 2911 bytes and written 712 bytes
---
New, TLSv1/SSLv3, Cipher is AES256-SHA
Server public key is 4096 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : AES256-SHA
    Session-ID: --- redacted ---
    Session-ID-ctx:
    Master-Key: --- redacted ---
    Key-Arg   : None
    Start Time: 1491529991
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---
* OK [CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ SASL-IR LOGIN-REFERRALS 
AUTH=PLAIN AUTH=LOGIN] cpe-67-10-173-141.satx.res.rr.com Panda IMAP 2010.417 at 
Thu, 6 Apr 2017 20:53:11 -0500 (CDT)
* BYE Autologout (idle for too long)
read:errno=0

--- end ---



--- post changes from today  - using /etc/c-config.cf

   set ssl-protocols -all +TLSV1.1 +TLSV1.2
   set ssl-cipher-list HIGH:!ADH:!EXP:!LOW:!SSLV2:!SSLV3
   set ssl-dh-parameters /etc/mail/certs/dh.param

---

subject=/CN= --- redacted ---
issuer=/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: DH, 2048 bits
---
SSL handshake has read 4103 bytes and written 625 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-GCM-SHA384
Server public key is 4096 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : DHE-RSA-AES256-GCM-SHA384
    Session-ID: --- redacted ---
    Session-ID-ctx:
    Master-Key: --- redacted ---
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - --- redacted ---

    Start Time: 1491528526
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---
* OK [CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ SASL-IR LOGIN-REFERRALS 
AUTH=PLAIN AUTH=LOGIN] localhost Panda IMAP 2010.417 at Thu, 6 Apr 2017 
20:28:46 -0500 (CDT)
* BYE Autologout (idle for too long)
read:errno=0

--- end ---


Regards
Neal Horman

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Description: S/MIME Cryptographic Signature

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