* dovecot with imaps* webmail * can't use the same keys generated in www lab, they're for the wrong FQDN<source>andrew@p51[http:~/prog/seneca/ops345/new$ sudo su -root@p51:~# certonly --manual --preferred-challenges dnscertonly: command not foundroot@p51:~# certbot certonly --manual --preferred-challenges dnsSaving debug log to /var/log/letsencrypt/letsencrypt.logPlugins selected: Authenticator manual, Installer NonePlease enter in your domain name(s) (comma and/or space separated) (Enter 'c'to cancel): email.asmith15.ops345.caObtaining a new certificatePerforming the following challenges:dns-01 challenge for email.asmith15.ops345.ca - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -NOTE: The IP of this machine will be publicly logged as having requested thiscertificate. If you're running certbot in manual mode on a machine that is notyour server, please ensure you're okay with that. Are you OK with your IP being logged?- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -(Y)es/(N)o: y - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Please deploy a DNS TXT record under the name_acme-challenge.email.asmith15wiki.ops345littlesvr.ca with the following value: PdK1vlZnYMdBO7untofSCkfXH2ejk3EE019R7A90x7Q Before continuing, verify the record is deployed.- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Press Enter to ContinueWaiting for verification...Cleaning up challenges IMPORTANT NOTES: - Congratulations! Your certificate and chain have been saved at: /etcwiki/letsencrypt/live/email.asmith15.ops345.ca/fullchain.pem Your key file OPS345_Lab_7 This page has been saved at: /etc/letsencrypt/live/email.asmith15.ops345.ca/privkey.pem Your cert will expire on 2022-02-28. To obtain a new or tweaked version of this certificate in the future, simply run certbot again. To non-interactively renew *all* of your certificates, run "certbot renew" - If you like Certbot, please consider supporting our work by: Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate Donating to EFF: https://eff.org/donate-le root@p51:~# cp /etc/letsencrypt/live/email.asmith15.ops345.ca/cert.pem ~andrew/prog/seneca/ops345/new/keys/email.asmith15.ops345.ca.cert.pemroot@p51:~# cp /etc/letsencrypt/live/email.asmith15.ops345.ca/privkey.pem ~andrew/prog/seneca/ops345/new/keys/email.asmith15.ops345.ca.key.pemroot@p51:~# chown andrew ~andrew/prog/seneca/ops345/new/keys/email.asmith15.ops345.ca.*</source>* Put keys on the email server:<source>scp -P 2212 -i keys/ssh/ops345-all-aws-machines.pem keys/email.asmith15moved.ops345.ca.* andrew@34.202.103.43:~[root@email andrew]# cp email.asmith15.ops345.ca.cert.pem /etc/pki/tls/certs/[root@email andrew]# cp email.asmith15.ops345.ca.key.pem /etc/pki/tls/private/</source>* configure postfix to enable encrypted connections from client software. add this to the bottom of main.cf:<source># Settings to enable secure SMTP using my self-signed certificate:smtpd_tls_auth_only = nosmtpd_use_tls = yessmtp_use_tls = yessmtpd_tls_key_file = /etc/pki/tls/private/email.asmith15.ops345.ca.key.pemsmtpd_tls_cert_file = /etc/pki/tls/certs/email.asmith15.ops345.ca.cert.pemtls_random_source = dev:/dev/urandomsmtpd_tls_loglevel = 1</source>* test with telnet/EHLO: should say 250-STARTTLS* complete test will be done with thunderbird later* dovecot installed in previous lab, it needs very little configuration for our simple setup* /etc/dovecot/dovecot.conf:* Modify the protocols option so that Dovecot will work with IMAP connections, no POP3 or LMTP.* 10-ssl.conf:<source>ssl_cert = </etc/pki/tls/certs/email.asmith15.ops345.ca.cert.pemssl_key = </etc/pki/tls/private/email.asmith15.ops345.ca.key.pem</source>* ss should show port 993, no 995 or 110* there's no iptables running on email, so just open port 993 in ops345sgemail* configure thunderbird:** IMAP: email.asmith15.ops345.ca, SSL 993, normal password, username without @domain** SMTP: email.asmith15.ops345.ca, STARTTLS 25, normal password, username without @domain* tail -f /var/log/maillog and send a message from thunderbird* The message is not sent, because postfix is not configured to authenticate users. encryption alone is not enough.* https://www.xmodulo.com/enable-user-authentication-postfix-smtp-server-sasl.html** except the SSL/TLS parameters part.* Send email again. Note the messages about connection timed out. We can't do anything about that in AWS Academy:** https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/* There's more to do anyway to set up a real sending server, as a minimum DKIM/SPF but reverse DNS for the domain also helps.
