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Merge 5afd6d7d44 into 5c7ba2a4c7

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David Piggott 2014-09-27 14:50:21 +00:00
commit 6f59b59981
1 changed files with 60 additions and 4 deletions
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64
setup/mail-postfix.sh
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@ -66,6 +66,60 @@ tools/editconf.py /etc/postfix/master.cf -s -w \
# Install the `outgoing_mail_header_filters` file required by the new 'authclean' service.
cp conf/postfix_outgoing_mail_header_filters /etc/postfix/outgoing_mail_header_filters
# Enable relaying from TLS authenticated sibling hosts
# The smtpd_tls_CAfile is superflous, but it turns warnings in the logs about untrusted certs
# into notices about trusted certs. Since in these cases Postfix is checking the fingerprint,
# it does not care about whether the remote certificate is signed by a trusted CA. But,
# looking at the logs, it's nice to be able to see that it is.
# The CA file is provided by the package ca-certificates.
#
# To grant relay access to a sibling host, install and configure Postfix on that host as a
# smarthost and set relayhost to [yourbox.domain.tld]. Then add these three parameters to the
# sibling host's /etc/postfix/main.cf (there's no such parameter as smtp_tls_wrappermode so we
# have to use STARTTLS to port 25):
# smtp_use_tls=yes
# smtp_tls_cert_file=/etc/ssl/certs/yoursiblinghost.domain.tld.chain.pem
# smtp_tls_key_file=/etc/ssl/private/yoursiblinghost.domain.tld.key
#
# Since we only care about the fingerprint, the certificate can be self-signed - it will just
# be harmlessly logged as untrusted in the logs as per the above note about smtpd_tls_CAfile.
#
# Run:
# openssl x509 -noout -fingerprint -sha1 -in /etc/ssl/certs/yoursiblinghost.domain.tld.chain.pem
# to get the sibling host's public key fingerprint. Then on the mailinabox add an entry for that
# fingerprint to /home/user-data/mail/relayers/relay_clientcerts, for example:
# echo "B1:6A:87:2E:98:B6:BC:54:4F:6F:2D:98:0F:50:C3:43:AC:07:72:E7 yoursiblinghost.domain.tld" >> /home/user-data/mail/relayers/relay_clientcerts
#
# Finally, on the mailinabox run:
# postmap /home/user-data/mail/relayers/relay_clientcerts
#
# To test on the sibling host, ensure you have mailutils installed (sudo aptitude install
# mailutils) and then run something like:
# echo "" | mail -r "an_address_that_your_mailinabox_receives_for@domain.tld" -s "Test" "an_address_your_mailinabox_does_not_receive_for@gmail.com"
# where the e.g. gmail address is one you do actually have.
#
# If the configuration is correct you'll get a test email at the e.g. gmail.com address. If not,
# you should at least get a relay rejection error email at the domain.tld address. Watching the
# box's logs should help diagnose any problems - to do so run:
# tail -f /var/log/mail.log
# To view the sibling host's queue you can use postqueue -p, and you can use postqueue -f to
# retrigger attempts to submit to the mailinabox.
#
# Be sure to create receiving accounts/aliases for all addresses that the sibling host(s) will
# send as!
tools/editconf.py /etc/postfix/main.cf \
smtpd_tls_ask_ccert=yes \
smtpd_tls_CAfile=/etc/ssl/certs/ca-certificates.crt \
smtpd_tls_fingerprint_digest=sha1 \
smtpd_tls_loglevel=2 \
relay_clientcerts=hash:$STORAGE_ROOT/mail/relayers/relay_clientcerts
mkdir -p $STORAGE_ROOT/mail/relayers
if [[ ! -f $STORAGE_ROOT/mail/relayers/relay_clientcerts ]]; then
touch $STORAGE_ROOT/mail/relayers/relay_clientcerts
postmap /home/user-data/mail/relayers/relay_clientcerts
fi
# Enable TLS on these and all other connections (i.e. ports 25 *and* 587) and
# require TLS before a user is allowed to authenticate. This also makes
# opportunistic TLS available on *incoming* mail.
@ -82,11 +136,12 @@ tools/editconf.py /etc/postfix/main.cf \
# relayed elsewhere. We don't want to be an "open relay". On outbound
# mail, require one of:
#
# * permit_sasl_authenticated: Authenticated users (i.e. on port 587).
# * permit_tls_clientcerts: (TLS) authenticated sibling hosts (on port 25).
# * permit_sasl_authenticated: (Password) authenticated users (on port 587).
# * permit_mynetworks: Mail that originates locally.
# * reject_unauth_destination: No one else. (Permits mail whose destination is local and rejects other mail.)
tools/editconf.py /etc/postfix/main.cf \
smtpd_relay_restrictions=permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_relay_restrictions=permit_tls_clientcerts,permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
# ### DANE
@ -131,7 +186,8 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
# * reject_non_fqdn_sender: Reject not-nice-looking return paths.
# * reject_unknown_sender_domain: Reject return paths with invalid domains.
# * reject_rhsbl_sender: Reject return paths that use blacklisted domains.
# * permit_sasl_authenticated: Authenticated users (i.e. on port 587) can skip further checks.
# * permit_tls_clientcerts: (TLS) authenticated sibling hosts (on port 25) can skip further checks.
# * permit_sasl_authenticated: (Password) authenticated users (on port 587) can skip further checks.
# * permit_mynetworks: Mail that originates locally can skip further checks.
# * reject_rbl_client: Reject connections from IP addresses blacklisted in zen.spamhaus.org
# * reject_unlisted_recipient: Although Postfix will reject mail to unknown recipients, it's nicer to reject such mail ahead of greylisting rather than after.
@ -144,7 +200,7 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
# "450 4.7.1 Client host rejected: Service unavailable". This is a retry code, so the mail doesn't properly bounce.
tools/editconf.py /etc/postfix/main.cf \
smtpd_sender_restrictions="reject_non_fqdn_sender,reject_unknown_sender_domain,reject_rhsbl_sender dbl.spamhaus.org" \
smtpd_recipient_restrictions=permit_sasl_authenticated,permit_mynetworks,"reject_rbl_client zen.spamhaus.org",reject_unlisted_recipient,"check_policy_service inet:127.0.0.1:10023"
smtpd_recipient_restrictions=permit_tls_clientcerts,permit_sasl_authenticated,permit_mynetworks,"reject_rbl_client zen.spamhaus.org",reject_unlisted_recipient,"check_policy_service inet:127.0.0.1:10023"
# Increase the message size limit from 10MB to 128MB.
tools/editconf.py /etc/postfix/main.cf \