Hello, I run openSMTPD on openbsd7.1, i was about to send this to openSMTP mailing list, but i think it s openbsd/chroot/static sendmail related
I just found out about `filter-dkimsign` , follow up on the man and installation instructions . and have the filter running : `_dkimsig 61499 0.0 0.0 704 3288 ?? Ip 6:39PM 0:00.03 /usr/local/libexec/smtpd/filter-dkimsign -d http://XXXXexample.com -s mydkim -k /etc/mail/dkim/private.rsa.key` my /etc/mail/dkim/private.rsa.key is mode 0440 and owned by _dkimsig and only apply on the localhost `listen on lo0 filter dkimsign_rsa` When the php fpm thingy calls mail ... ` Jun 1 18:45:15 XXXX php-fpm-8.1[80816]: mail() on [/XXXXexample.com/wp-includes/PHPMailer/PHPMailer.php:877]: To: l...@gmail.com -- Headers: Date: Wed, 1 Jun 2022 16:45:15 +0000 ` it just gets stuck forever. I cannot find any log error, my clueless guess is the sendmail call is stuck on a read and the filter somewhat broke the stdout ? looking for actual clues Also the server WAS sending email without the filter. and using sendmail from the fpm user (did) work(s) Another guess: would this be the behavior if a header is not found ? Maybe it was DNS ? ( /etc/hosts ) So after poking around and adding -v to the php sendmail .... i figure out i broke the chrooted sendmail, because is create a $chroot/etc/hosts file I now unit test the problem like that (i did add ksh to the chroot): # chroot -g merci -u merci /var/www /bin/sh -c 'echo HELLO | /usr/sbin/sendmail -t -v -v -4 -f no-re...@xxxxexample.com. -F TEST3 -i sven.falem...@gmail.com' Jun 1 21:02:58 merci smtpd[77228]: 1658fe91a067cec2 smtp connected address=127.0.0.1 host=localhost <<< 220 XXXXexample.com. ESMTP OpenSMTPD >>> EHLO XXXXexample.com. Jun 1 21:02:58 merci smtpd[77228]: 1658fe91a067cec2 smtp failed-command command="EHLO XXXXexample.com." result="501 5.5.4 Invalid command arguments: Invalid domain name" <<< 501 5.5.4 Invalid command arguments: Invalid domain name >>> HELO XXXXexample.com. <<< 501 5.5.4 Invalid command arguments: Invalid domain name Jun 1 21:02:58 merci smtpd[77228]: 1658fe91a067cec2 smtp failed-command command="HELO XXXXexample.com." result="501 5.5.4 Invalid command arguments: Invalid domain name" sendmail: remote host refuses our greeting Jun 1 21:02:58 merci smtpd[77228]: 1658fe91a067cec2 smtp disconnected reason=disconnect 'fun' fact i cannot get it to work again the host file: 127.0.0.1 localhost XXXXexample.com. ::1 localhost and in despair i tried # match from local for any action "outbound" match from any for any action "outbound" Note: XXXXexample.com. is a placeholder, and resolved from any public dns, i used reboot a few times. I do not understand why deleting /var/www/etc/hosts does not go back to previous behavior nor why smtpd refuses EHLO XXXXexample.com. Thanks for reading that far, Please help Best
