60 lines
3.4 KiB
Bash
60 lines
3.4 KiB
Bash
#!/bin/sh
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# Configures Postfix to relay one domain to pneumatube over LMTP, per the
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# plan discussed for the real deployment (main.cf relay_domains/
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# transport_maps, master.cf's lmtp client service). This is a test/demo
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# harness, not production hardening: no TLS, no abuse limits, open to any
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# connecting host on the compose network.
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set -e
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: "${POSTFIX_RELAY_DOMAIN:?set POSTFIX_RELAY_DOMAIN to the email domain pneumatube accepts}"
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: "${PNEUMATUBE_HOST:?set PNEUMATUBE_HOST to pneumatube's hostname on the compose network}"
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PNEUMATUBE_PORT="${PNEUMATUBE_PORT:-2424}"
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# "No configuration" at install time (Dockerfile) skips main.cf generation
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# entirely, so start from Debian's template before postconf-ing it.
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[ -f /etc/postfix/main.cf ] || cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
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# Postfix logs via syslog by default, which is silent in a minimal
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# container with no syslog daemon; maillog_file (3.4+) writes directly.
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postconf -e "maillog_file=/dev/stdout"
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postconf -e "myhostname=${POSTFIX_MYHOSTNAME:-postfix.local}"
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# Postfix's default "dns" host-lookup method queries the nameserver with
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# the bare hostname, bypassing /etc/resolv.conf's search domain. Container
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# DNS (e.g. podman's aardvark-dns) often only answers the FQDN form, so the
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# compose service name alone resolves via getaddrinfo() ("native") but not
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# via Postfix's own resolver. native also respects /etc/hosts.
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postconf -e "smtp_host_lookup=native"
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postconf -e "lmtp_host_lookup=native"
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postconf -e "mydestination="
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postconf -e "relay_domains=${POSTFIX_RELAY_DOMAIN}"
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postconf -e "transport_maps=hash:/etc/postfix/transport"
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# Split in two: relay_restrictions decides only whether this domain is ours
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# to relay at all; recipient_restrictions then asks pneumatube's tcp_table
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# lookup service about the specific user, live, before RCPT TO is accepted —
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# this is what turns an unknown user into an inline reject instead of a
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# queued-then-bounced message (see lookup_server.py for the other side).
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postconf -e "smtpd_relay_restrictions=permit_mynetworks,reject_unauth_destination"
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postconf -e "smtpd_recipient_restrictions=check_recipient_access tcp:${PNEUMATUBE_HOST}:${PNEUMATUBE_LOOKUP_PORT:-2526}"
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# Test network only: every connecting host is trusted. Do not carry this
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# setting into a real deployment (see the project's Postfix wiring notes).
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postconf -e "mynetworks=0.0.0.0/0"
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echo "${POSTFIX_RELAY_DOMAIN} lmtp:inet:${PNEUMATUBE_HOST}:${PNEUMATUBE_PORT}" > /etc/postfix/transport
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postmap /etc/postfix/transport
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grep -q '^lmtp[[:space:]]' /etc/postfix/master.cf \
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|| echo 'lmtp unix - - n - - lmtp' >> /etc/postfix/master.cf
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# The shipped master.cf chroots smtpd and the lmtp client by default, which
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# hides /etc/resolv.conf and /etc/nsswitch.conf from them — resolving the
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# pneumatube hostname then fails ("Temporary failure in name resolution")
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# regardless of *_host_lookup, since getaddrinfo() itself can't see the
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# chroot's host config. smtpd needs this too: it's the one connecting out to
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# the tcp_table lookup service. Rewrite the chroot column (5th field)
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# directly; postconf -P appends a "-o chroot=n" command-line override
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# instead, which is not a valid override and is simply ignored.
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awk '($1 == "lmtp" && $2 == "unix") || ($1 == "smtp" && $2 == "inet") { $5 = "n" } { print }' \
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/etc/postfix/master.cf > /etc/postfix/master.cf.new
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mv /etc/postfix/master.cf.new /etc/postfix/master.cf
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exec postfix start-fg
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