Re: Forcing TLS 1.2 on submission

2018-03-29 Thread Viktor Dukhovni
> On Mar 29, 2018, at 5:03 PM, @lbutlr wrote: > > If you do this, then you do not need smtpd_tls_exclude_ciphers, right? No, protocol versions and ciphersuites are different beasts. But with "smtpd_tls_mandatory_ciphers = high" there's generally not much need for any further ciphersuite exclu

Re: Forcing TLS 1.2 on submission

2018-03-29 Thread @lbutlr
On 2018-03-29 (13:15 MDT), Viktor Dukhovni wrote: > > smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3,!TLSv1,!TLSv1.1 If you do this, then you do not need smtpd_tls_exclude_ciphers, right? Also, do the setting above also exclude the weaker protocols like MD5 and RC2? -- Chico: You sing-a high. Co

Re: Forcing TLS 1.2 on submission

2018-03-29 Thread Viktor Dukhovni
> On Mar 29, 2018, at 3:26 PM, J Doe wrote: > > Ok, I have to say I feel pretty pleased with myself - I found a solution > roughly around when your e-mail came it, so I tried my solution first and it > worked! > > I ran nmap against the server to enumerate the TLS versions in use and the >

Re: Forcing TLS 1.2 on submission

2018-03-29 Thread J Doe
Hi Viktor > On Mar 29, 2018, at 3:15 PM, Viktor Dukhovni > wrote: > > > >> On Mar 29, 2018, at 2:56 PM, J Doe wrote: >> >> I am attempting to restrict the TLS protocol version used by my SMTP AUTH’d >> clients on the submission service. >> >> In master.cf I have added the following to the

Re: Forcing TLS 1.2 on submission

2018-03-29 Thread Viktor Dukhovni
> On Mar 29, 2018, at 2:56 PM, J Doe wrote: > > I am attempting to restrict the TLS protocol version used by my SMTP AUTH’d > clients on the submission service. > > In master.cf I have added the following to the submission service: > >-o smtpd_tls_ciphers=high >-o smtpd_tls_exclude_c

Forcing TLS 1.2 on submission

2018-03-29 Thread J Doe
Hi, I am attempting to restrict the TLS protocol version used by my SMTP AUTH’d clients on the submission service. In master.cf I have added the following to the submission service: -o smtpd_tls_ciphers=high -o smtpd_tls_exclude_ciphers=EXPORT,MEDIUM -o smtpd_tls_protocols=!SSLv2,!S