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Implement HAProxy protocol support

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This patch implements support for incoming connections wrapped in the
HAProxy protocol v1.

This is useful when running chasquid behind a HAProxy server, as it
needs the original source IP to perform SPF checks.

This patch is a reimplementation of one originally provided by Denys
Vitali in pull request #15, except the logic for the protocol handling
is moved to a new package, and the smtpsrv.Conn handling of the source
IP is simplified.

It is marked as experimental for now, since we want to give it a bit
more exposure just in case the option/api needs adjustment.

Thanks a lot to Denys Vitali (@denysvitali in github) for sending the
original patch for this, and helping test it!
This commit is contained in:
Alberto Bertogli
2020-11-12 22:00:46 +00:00
parent c9d3ba0ca0
commit e79586a014
22 changed files with 389 additions and 24 deletions
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8
etc/chasquid/chasquid.conf
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@@ -87,3 +87,11 @@
# Default: "" (autodetect)
#dovecot_userdb_path: ""
#dovecot_client_path: ""
# Expect incoming SMTP connections to use the HAProxy protocol.
# EXPERIMENTAL - Might change in backwards-incompatible ways.
# If set to true, this allows deploying chasquid behind a HAProxy server, as
# the address information is preserved, and SPF checks can be performed
# properly.
# Default: false
#haproxy_incoming: false