This patch updates the auto-generated code to match the latest tooling
versions.
In particular, the protobufs are regenerated, and the new version no
longer supports unkeyed literals, so some minor changes are needed.
Other than that, the cipher list is extended with the latest ciphers.
This patch adds dovecot support to the chasquid daemon, using the
internal dovecot library added in previous patches.
Dovecot support is still considered EXPERIMENTAL and may be reverted, or
changed in backwards-incompatible ways.
The patch also adds the corresponding integration test, which brings up
a dovecot server with a custom configuration, and tests chasquid's
authentication against it. If dovecot is not installed, the test is
skipped.
This patch adds support for TLS-wrapped submission connections.
Instead of clients establishing a connection over plain text and then
using STARTTLS to switch over a TLS connection, this new mode allows the
clients to connect directly over TLS, like it's done in HTTPS.
This is not an official standard yet, but it's reasonably common in
practice, and provides some advantages over the traditional submission
port.
The default port is 465, commonly used for this; chasquid defaults to
systemd file descriptor passing as for the other protocols (for now).
The current default is "procmail" for historical reasons, but the
program has been unmaintained for years and its use is not generally
advisable.
This patch changes the default MDA binary to "maildrop", which is a more
modern and reasonable MDA to use.
We keep the courier.Procmail name for now, as that's internal, but it
may be changed later. Its documentation is updated to note that the
name is just for reference but it actually works with almost any binary.
Picking the domain used in the DSN message "From" header is more
complicated than it needs to be, causing confusing code paths and having
different uses for the hostname, which should be purely aesthetic.
This patch makes the queue pick the DSN "From" domain from the message
itself, by looking for a local domain in either the sender or the
original recipients. We should find at least one, otherwise it'd be
relaying.
This allows the code to be simplified, and we can narrow the scope of
the hostname option even further.
The default INFO logs are more oriented towards debugging and can be
a bit too verbose when looking for high-level information.
This patch introduces a new "maillog" package, used to log messages of
particular relevance to mail transmission at a higher level.
When we permanently failed to deliver to one or more recipients, send delivery
status notifications back to the sender.
To do this, we need to extend a couple of internal structures, to keep track
of the original destinations (so we can include them in the message, for
reference), and the hostname we're identifying ourselves as (this is arguable
but we're going with it for now, may change later).
This patch adds a "data_dir" option, that chasquid will use to store
persistent data. It defaults to "/var/lib/chasquid" (for now, at least).
Users will come in subsequent patches.
This is just a run of "go generate ./..." which re-generates the protocol
buffers code.
There is no actual change in the logic or APIs, it's just a rebuild with a
newer proto compiler. While it's not strictly necessary, it will help make
subsequent patches cleaner.
We want to be able to distinguish between connections for SMTP and connections
for submission, so we can make different policy decisions.
To do that, we first make the configuration aware of the different kinds of
addresses. This is done in this patch in a backwards-incompatible way, but at
this point in time it is ok to do so.
Then, we extend systemd's socket passing library to support socket naming, so
we can tell the different sockets apart. This is done via the
LISTEN_FDNAMES/FileDescriptorName mechanism.
And finally we make the server and connection types aware of the socket mode.
This patch adds configuration options for the MDA binary and command line
arguments, and changes the (soon to be renamed) procmail courier to make use
of them.
This patch introduces a basic on disk configuration, comprised of a main
configuration file and per-domain directories.
It's still not complete, but will be extended in subsequent patches.
