----- Message from Ezsra McDonald <[email protected]> ---------
Date: Tue, 19 Oct 2021 15:12:35 -0500
From: Ezsra McDonald <[email protected]>
Reply-To: Info <[email protected]>
Subject: cyradm TLS issues
To: Info <[email protected]>
SYSTEM INFORMATION:
OS: CentOS 7
Cyrus-Imap: RPM = cyrus-imapd-2.4.17-15.el7.x86_64
TLS CONFIGURATION:
tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem
tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.key
tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt
tls_cipher_list:
HIGH:!aNULL:!eNULL:!LOW:!MD5:!EXPORT:!DES:!3DES:!RC4:@STRENGTH
tls_prefer_server_ciphers: 1
tls_versions: tls1_2
#tls_versions: tls1_0 tls1_1 tls1_2
PROBLEM:
When I attempt to login using cyradm I get SSL/TLS errors. The
only way I have been able to get this to work was to enable TLS
version 1.0. Security team won't allow less than TLS1.2 and I am not
able to move to a newer OS at this time. Is there a way to get it
working on CentOS 7 with TLSv1.2 or later? Maybe I need different
ciphers?
If I uncomment the last line I am able to connect and login.
tls_versions: tls1_0 tls1_1 tls1_2
ERRORS:
:~$ cyradm --user cyrus --tlskey --auth plain localhost
[ SSL_connect error -1 ]
[ SSL session removed ]
[ TLS negotiation did not succeed ]
LOGS: With only TLSv1.2 enabled
imap[]: STARTTLS negotiation failed: localhost [127.0.0.1]
LOGS: With TLSv1.0 enabled
imap[]: starttls: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256
bits new) no authentication
Any assistance is appreciated.
--Ez
CYRUS[1] / Info / see discussions[2] + participants[3] +
delivery options[4] Permalink[5]
Your error shows you are connecting from localhost. Why use TLS on
localhost... do the Security team insist on encrypted connection on
localhost? Seems like overkill.
I run a separate IMAPD with a separate config file with
'allowplaintext: yes' which listens only to localhost connection for
just this purpose. Even if you need to connect remotely, a SSH session
to localhost which is easy to secure will sort that out.
Simon.
Links:
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[5]
https://cyrus.topicbox.com/groups/info/T21eaaa194ab9b730-Mb01973f841d0bc229cd0d491
___________
Simon Wilson
M: 0400 12 11 16
------------------------------------------
Cyrus: Info
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