On 28/10/2019 16:12 Fourhundred Thecat via dovecot dovecot@dovecot.org wrote:
When my client connects, I see this in my log:
dovecot: imap-login: TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)
Whereas, when client connects to my postfix server, I see:
Anonymous TLS connection established from * TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
how can I tell dovecot to use AES256, instead of AES128 ?
is this set by ssl_cipher_list ? Here are my current values (defaults)
# doveconf ssl_cipher_list ssl_cipher_list = ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH
# dovecot --version 2.3.4.1
thanks,
Perhaps your client does not support it?
Also, you could try the *default* cipher list (unset ssl_cipher_list), which is reasonable. Also make sure you have 'ssl_prefer_server_ciphers=yes', so that the server-side priority list is used.
aki