Certificate and showing a sign-cert not there

[Christian Kivalo]

On 2022-02-08 15:53, Wayne Spivak wrote:
> Hi -
> 
> I am running Postfix 3.6.4 with Dovecot 2.3.17.1 (476cd46418).
> 
> I have a multi-signed cert from Entrust.
> 
> The cert works fine on port 25.
Certificates on port 25 verify ok for me.
> 
> However, on Port 587 I get an error: c
Certificates on port 587 verify ok for me.
> 
> [root at mcq wbs]# openssl s_client -connect mcq.sbanetweb.com:993
> -servername mcq.sbanetweb.com

Now you check port 993? For me the certificates also don't verify on 
port 993.

Have you built your certificate file correctly?
The intermediate cert seems to be missing.

For port 25, 587 you send a chain of 3 certificates.
For port 993 you only send one certificate.

> 
> CONNECTED(00000003)
> 
> depth=0 C = US, ST = New York, L = Bellmore, O = SBA  Consulting LTD,
> CN = mcq.sbanetweb.com
> 
> verify error:num=20:unable to get local issuer certificate
> 
> verify return:1
> 
> depth=0 C = US, ST = New York, L = Bellmore, O = SBA  Consulting LTD,
> CN = mcq.sbanetweb.com
> 
> verify error:num=21:unable to verify the first certificate
> 
> verify return:1
> 
> depth=0 C = US, ST = New York, L = Bellmore, O = SBA  Consulting LTD,
> CN = mcq.sbanetweb.com
> 
> verify return:1
> 
> ---
> 
> Certificate chain
> 
>  0 s:C = US, ST = New York, L = Bellmore, O = SBA  Consulting LTD, CN
> = mcq.sbanetweb.com
> 
>    i:C = US, O = "Entrust, Inc.", OU = See www.entrust.net/legal-terms
> [1], OU = "(c) 2012 Entrust, Inc. - for authorized use only", CN =
> Entrust Certification Authority - L1K
> 
> [root at mcq wbs]# dovecot -n
> 
> # 2.3.17.1 (476cd46418): /etc/dovecot/dovecot.conf
> 
> # OS: Linux 5.16.5-200.fc35.x86_64 x86_64 Fedora release 35 (Thirty
> Five)
> 
> # Hostname: mcq.sbanetweb.com
> 
> auth_mechanisms = plain login
> 
> disable_plaintext_auth = no
> 
> mbox_write_locks = fcntl
> 
> namespace inbox {
> 
>   inbox = yes
> 
>   location =
> 
>   mailbox Drafts {
> 
>     special_use = \Drafts
> 
>   }
> 
>   mailbox Junk {
> 
>     special_use = \Junk
> 
>   }
> 
>   mailbox Sent {
> 
>     special_use = \Sent
> 
>   }
> 
>   mailbox "Sent Messages" {
> 
>     special_use = \Sent
> 
>   }
> 
>   mailbox Trash {
> 
>     special_use = \Trash
> 
>   }
> 
>   prefix =
> 
> }
> 
> passdb {
> 
>   driver = pam
> 
> }
> 
> protocols = imap
> 
> service auth {
> 
>   unix_listener /var/spool/postfix/private/auth {
> 
>     group = postfix
> 
>     mode = 0666
> 
>     user = postfix
> 
>   }
> 
>   unix_listener auth-userdb {
> 
>     group = postfix
> 
>     mode = 0666
> 
>     user = postfix
> 
>   }
> 
> }
> 
> service imap-login {
> 
>   inet_listener imap {
> 
>     port = 143
> 
>   }
> 
>   inet_listener imaps {
> 
>     port = 993
> 
>     ssl = yes
> 
>   }
> 
> }
> 
> service submission-login {
> 
>   inet_listener submission {
> 
>     port = 587
> 
>   }
> 
> }
> 
> ssl = required
> 
> ssl_cert = </etc/postfix/tls/ServerCertificate.pem
In what order are the certificates in here?

See 
https://doc.dovecot.org/configuration_manual/dovecot_ssl_configuration/#id7

> 
> ssl_cipher_list =
> ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
> 
> ssl_client_ca_dir = /etc/postfix/tls/
> 
> ssl_client_ca_file = ChainBundle.pem
> 
> ssl_dh = # hidden, use -P to show it
> 
> ssl_key = # hidden, use -P to show it
> 
> ssl_prefer_server_ciphers = yes
> 
> userdb {
> 
>   driver = passwd
> 
> }
> 
> protocol imap {
> 
>   mail_max_userip_connections = 15
> 
> }
> 
> Any ideas?
> 
> Wayne Spivak
> 
> SBANETWEB.com
> 
> Links:
> ------
> [1] http://www.entrust.net/legal-terms

-- 
  Christian Kivalo