## ## SSL settings ## # SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt> ssl = required # PEM encoded X.509 SSL/TLS certificate and private key. They're opened before # dropping root privileges, so keep the key file unreadable by anyone but # root. Included doc/mkcert.sh can be used to easily generate self-signed # certificate, just make sure to update the domains in dovecot-openssl.cnf ssl_cert = </etc/dovecot/private/dovecot.pem ssl_key = </etc/dovecot/private/dovecot.key # If key file is password protected, give the password here. Alternatively # give it when starting dovecot with -p parameter. Since this file is often # world-readable, you may want to place this setting instead to a different # root owned 0600 file by using ssl_key_password = <path. #ssl_key_password = # PEM encoded trusted certificate authority. Set this only if you intend to use # ssl_verify_client_cert=yes. The file should contain the CA certificate(s) # followed by the matching CRL(s). (e.g. ssl_ca = </etc/ssl/certs/ca.pem) #ssl_ca = # Require that CRL check succeeds for client certificates. #ssl_require_crl = yes # Directory and/or file for trusted SSL CA certificates. These are used only # when Dovecot needs to act as an SSL client (e.g. imapc backend or # submission service). The directory is usually /etc/ssl/certs in # Debian-based systems and the file is /etc/pki/tls/cert.pem in # RedHat-based systems. ssl_client_ca_dir = /etc/ssl/certs #ssl_client_ca_file = # Require valid cert when connecting to a remote server #ssl_client_require_valid_cert = yes # Request client to send a certificate. If you also want to require it, set # auth_ssl_require_client_cert=yes in auth section. #ssl_verify_client_cert = no # Which field from certificate to use for username. commonName and # x500UniqueIdentifier are the usual choices. You'll also need to set # auth_ssl_username_from_cert=yes. #ssl_cert_username_field = commonName # SSL DH parameters # Generate new params with `openssl dhparam -out /etc/dovecot/dh.pem 4096` # Or migrate from old ssl-parameters.dat file with the command dovecot # gives on startup when ssl_dh is unset. ssl_dh = </usr/share/dovecot/dh.pem # Minimum SSL protocol version to use. Potentially recognized values are SSLv3, # TLSv1, TLSv1.1, and TLSv1.2, depending on the OpenSSL version used. ssl_min_protocol = TLSv1.2 # SSL ciphers to use, the default is: #ssl_cipher_list = ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH # To disable non-EC DH, use: #ssl_cipher_list = ALL:!DH:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384 # Colon separated list of elliptic curves to use. Empty value (the default) # means use the defaults from the SSL library. P-521:P-384:P-256 would be an # example of a valid value. #ssl_curve_list = # Prefer the server's order of ciphers over client's. ssl_prefer_server_ciphers = no # SSL crypto device to use, for valid values run "openssl engine" #ssl_crypto_device = # SSL extra options. Currently supported options are: # compression - Enable compression. # no_ticket - Disable SSL session tickets. #ssl_options = # include domain specific ssl certs !include_try ../sites.d/*