From c45a3012f45d6d120d316eb01b4cd8f97db2d52d Mon Sep 17 00:00:00 2001 From: Christian Heller Date: Sun, 24 May 2020 22:40:49 +0200 Subject: [PATCH] Improve documentation. --- buster/etc_files/mail/etc/aliases | 1 + buster/other_files/append_postfix_main.cf | 3 +- buster/setup_scripts/setup_mail.sh | 47 ++++++++++------------- 3 files changed, 23 insertions(+), 28 deletions(-) diff --git a/buster/etc_files/mail/etc/aliases b/buster/etc_files/mail/etc/aliases index 59c52b4..5c52e6f 100644 --- a/buster/etc_files/mail/etc/aliases +++ b/buster/etc_files/mail/etc/aliases @@ -1,4 +1,5 @@ # /etc/aliases +# maps whom what is sent to # As per RFC 2142. mailer-daemon: plom diff --git a/buster/other_files/append_postfix_main.cf b/buster/other_files/append_postfix_main.cf index 5ef0824..3a38080 100644 --- a/buster/other_files/append_postfix_main.cf +++ b/buster/other_files/append_postfix_main.cf @@ -13,7 +13,8 @@ smtpd_milters = inet:localhost:8892 # allows us to do stuff like dovecot-side sieve filtering. mailbox_transport = lmtp:inet:127.0.0.1:2424 -# use dovecot SASL for SMTP access +# to authenticate on SMTP, we need a SASL mechanism; we talk to dovecot +# for this, since it provides one smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes diff --git a/buster/setup_scripts/setup_mail.sh b/buster/setup_scripts/setup_mail.sh index 8120017..b584921 100755 --- a/buster/setup_scripts/setup_mail.sh +++ b/buster/setup_scripts/setup_mail.sh @@ -1,6 +1,7 @@ #!/bin/sh set -e +# Check we have the necessary arguments. if [ "$#" -lt 1 ]; then echo 'Need mail for letsencrypt (and optionally old server IP).' false @@ -14,8 +15,11 @@ echo "postfix postfix/mailname string $(hostname -f)" | debconf-set-selections ./install_for_target.sh mail ./copy_dirtree.sh "${config_tree_prefix}/etc_files" "" mail nft -f /etc/nftables.conf + +# Rebuild aliases DB from /etc/aliases newaliases +# Update config files without overwriting defaults. cat "${config_tree_prefix}/other_files/append_postfix_main.cf" >> /etc/postfix/main.cf cat "${config_tree_prefix}/other_files/append_postfix_master.cf" >> /etc/postfix/master.cf cat "${config_tree_prefix}/other_files/append_opendkim.conf" >> /etc/opendkim.conf @@ -29,22 +33,31 @@ certbot certonly --standalone --agree-tos --no-eff-email -m "${mail}" -d "$(host # OpenDKIM setup. selector=$(hostname)$(date +%Y%m%d) -#opendkim-genkey -D /etc/dkimkeys -s "${selector}" opendkim-genkey -d "$(hostname -f)" -D /etc/dkimkeys -s "${selector}" sed -i "s/REPLACE_hostname_ECALPER/$(hostname -f)/g" /etc/opendkim.conf sed -i "s/REPLACE_selector_ECALPER/${selector}/g" /etc/opendkim.conf # Dovecot sieve filtering via LMTP. Without this, mail only gets -# delivered to /var/mail/…. +# delivered to /var/mail/…, with it /var/mail/… remains the fallback +# inbox, but all else is sieve-filtered to ~/mail/. cp "${config_tree_prefix}/other_files/dovecot.sieve" /home/plom/.dovecot.sieve chown plom:plom /home/plom/.dovecot.sieve +# In addition to our postfix server receiving mails, we funnel mails from a +# POP3 account into dovecot via fetchmail. It might make sense to adapt the +# ~/.dovecot.sieve to move mails targeted to the fetched mail account to their +# own mbox. cp "${config_tree_prefix}/other_files/fetchmailrc" /home/plom/.fetchmailrc chown plom:plom /home/plom/.fetchmailrc chmod 0700 /home/plom/.fetchmailrc + +# Pingmail setup. cp "${config_tree_prefix}/other_files/pingmailrc" /home/plom/.pingmailrc chown plom:plom /home/plom/.pingmailrc su -lc "cd && git clone https://plomlompom.com/repos/clone/pingmail" plom + +# Pingmail and fetchmail have some systemd timers waiting. To let systemd +# know about them, do this. systemctl daemon-reload systemctl enable --now fetchmail_old_account.timer systemctl enable --now pingmail.timer @@ -53,7 +66,6 @@ systemctl enable --now pingmail.timer echo "ssl_cert = /etc/dovecot/conf.d/99-ssl-certs.conf echo "ssl_key = > /etc/dovecot/conf.d/99-ssl-certs.conf password=$(pwgen -s 100 1) -#echo 'mail_privileged_group = mail' >> /etc/dovecot/conf.d/99-mail.conf echo "plom:${password}" | chpasswd # Get old mail data, shutdown old postfix server. @@ -76,10 +88,12 @@ if [ "${old_server}" != "" ]; then su -lc "scp plom@${old_server}:/var/mail/plom /var/mail/plom" plom fi +# Start everything anew to ensure new configurations. service opendkim restart service postfix restart service dovecot restart +# Final advice to user. echo "To put into DNS:" cat "/etc/dkimkeys/${selector}.txt" echo "If subdomain, append .subdomain to _domainkeys!" @@ -89,33 +103,12 @@ echo "Also ensure reverse DNS lookup for our IP points to $(hostname -f)" echo "Also ensure MX record of priority 10 for @ or subdomain pointing to $(hostname -f)" echo "IMAPS password for user plom is: ${password}" +# TODO: +# - mailutils.conf from old config for pingmail? + # todo just for proper mail /sending/: -# * figure out /etc/mailname ("used by the Mail Transfer Agent (i.e. mail server) to know its own hostname", "will contain the portion after the username and @ (at) sign for email addresses of users on the machine", "Postfix sets myorigin=/etc/mailname. Myorigin is appended (with an @) to any bare name in any address field. During (re)configure, if /etc/mailname exists, it is used as the default value for myorigin in debconf dialogs. Changing it from the default results in postinst rewriting /etc/mailname to the new value.") – figure out if it is actually used? -# * figure out /etc/postfix/main.cf -# - myorigin ("specifies the domain that appears in mail that is posted on this machine. The default is to use the local machine name, $myhostname, which defaults to the name of the machine. Unless you are running a really small site, you probably want to change that into $mydomain, which defaults to the parent domain of the machine name") -# - myhostname ("The internet hostname of this mail system. The default is to use the fully-qualified domain name (FQDN) from gethostname(), or to use the non-FQDN result from gethostname() and append ".$mydomain". $myhostname is used as a default value for many other configuration parameters.") -# - mydomain ("The internet domain name of this mail system. The default is to use $myhostname minus the first component, or "localdomain" (Postfix 2.3 and later). $mydomain is used as a default value for many other configuration parameters.") -# - relay_domains ("What destination domains (and subdomains thereof) this system will relay mail to") -# - mydestination ("The list of domains that are delivered via the $local_transport mail delivery transport.") -# * figure out /etc/postfix/master.cf (configures what postfix daemons run in what way?) # * how to check IP safety # https://talosintelligence.com/reputation_center/lookup?search=$IP # http://www.anti-abuse.org/multi-rbl-check-results/?host= # https://www.dnsbl.info/dnsbl-database-check.php # note that none of these catch the IPs that gmx etc. reject - -# other stuff: -# * figure out /etc/aliases (maps whom what is sent to – just re-use old core.plomlompom.com one? – also, run newaliases to generate /etc/aliases.db) -# * more /etc/postfix/main.cf -# - smtpd_recipient_restrictions -# - smtpd_helo_restrictions -# - smtpd_client_restrictions -# -# for using SMTP server remotely: -# - SASL mechanism, may use dovecot for that (smtpd_sasl_type, smtpd_sasl_path) -# - see https://wiki2.dovecot.org/HowTo/PostfixAndDovecotSASL -# - SASL is not a protocol but an abstraction layer to some auth mechanism -# - SSL works on transport layer -# - wild guess: TLS/SSL is used to authenticate /the server/ to the client, while SASL is used to identify /the client/ to the server -# - then it should be possible to do SASL without TLS/STARTTLS first? (experiment) -# - the telnet test should offer AUTH then without doing STARTTLS first -- 2.30.2