# 1.1.11: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.28-14-server x86_64 Ubuntu 9.04
Here's the situation:
I have several local clients (Thunderbird) which do not use TLS at all.
It's plaintext completely, on port 143, because the connection is local
and there are no unauthorized users on this network (it's a home
network). I want to keep it that way to keep things simple.
Tools / Account Settings / Server Settings:
Use Secure Connection: Never
Use Secure Authentication: unchecked
Until now, this has worked very well. No problems so far.
But now I am also setting up IMAPS for remote iPhone clients, with
client/server certificates. This is how I generated the certs:
http://impetus.us/~rjmooney/projects/misc/clientcertauth.html
On the iPhone I uploaded the client.crt file (couldn't import client.p12
for some reason). For Dovecot I am using ca.crt, server.crt and server.key.
ssl_listen: *:993
ssl_disable: no
ssl_ca_file: /blah/ca.crt
ssl_cert_file: /blah/server.crt
ssl_key_file: /blah/server.key
ssl_key_password:
ssl_parameters_regenerate: 168
ssl_cipher_list: ALL:!LOW:!SSLv2
ssl_cert_username_field: commonName
ssl_verify_client_cert: yes
disable_plaintext_auth: no
auth default:
mechanisms: plain login
ssl_require_client_cert: no
ssl_username_from_cert: no
I analyzed the connection on 993 with Wireshark and apparently all is
good: it's encrypted, I see the certificate exchanges taking place.
But I am worried about authenticating the connections from the iPhone
and I would like to configure "ssl_require_client_cert: yes" so that a
valid certificate is always required. But if I do that then Thunderbird
fails to login because it's required a certificate.
This is puzzling. I thought that setting would only influence SSL
connections. But apparently it also affects plaintext logins from
Thunderbird.
Is there a way to require a cert from the iPhone TLS connections on port
993, but do not require it from clients connecting to port 143?
--
Florin Andrei
http://florin.myip.org/
