Difference between revisions of "TLS certificate for sendmail"
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250 HELP |
250 HELP |
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| − | To obtain the certificate (see [https://cromwell-intl.com/open-source/sendmail-ssl.html here): |
+ | To obtain the certificate (see [https://cromwell-intl.com/open-source/sendmail-ssl.html here]): |
openssl s_client -connect pomo.komputilo.org:465 -tls1_2 |
openssl s_client -connect pomo.komputilo.org:465 -tls1_2 |
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Revision as of 09:33, 18 April 2020
Getting the certificate:
apt install certbot certbot certonly --webroot #domain name: pomo.komputilo.org #webroot for pomo: directoy apache serves for http://pomo.komputilo.org
To install the certificate in sendmail, insert into /etc/mail/sendmail.mc (partially copied from sendmail.org, and letsencrypt.org):
define(`confCACERT_PATH', `/etc/letsencrypt/live/pomo.komputilo.org')dnl define(`confCACERT', `/etc/letsencrypt/live/pomo.komputilo.org/chain.pem')dnl define(`confSERVER_CERT', `/etc/letsencrypt/live/pomo.komputilo.org/cert.pem')dnl define(`confSERVER_KEY', `/etc/letsencrypt/live/pomo.komputilo.org/privkey.pem')dnl define(`confCLIENT_CERT', `/etc/letsencrypt/live/pomo.komputilo.org/cert.pem')dnl define(`confCLIENT_KEY', `/etc/letsencrypt/live/pomo.komputilo.org/privkey.pem')dnl define(`confAUTH_OPTIONS', `A p y')dnl
To test:
telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 pomo.komputilo.org ESMTP Sendmail 8.15.2/8.15.2/Debian-8; Sat, 18 Apr 2020 10:31:08 +0200; (No UCE/UBE) logging access from: localhost(OK)-localhost [127.0.0.1]
Issue the ehlo localhost command, and check the response for '250-STARTTLS':
ehlo localhost 250-pomo.komputilo.org Hello localhost [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-EXPN 250-VERB 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-AUTH DIGEST-MD5 CRAM-MD5 250-STARTTLS 250-DELIVERBY 250 HELP
To obtain the certificate (see here):
openssl s_client -connect pomo.komputilo.org:465 -tls1_2
