From: "Richard Toohey via tech" <tech@openbsd.org>
Subject: Re: smtpd mda set ORIGINAL_RECIPIENT
To: gilles via tech <tech@openbsd.org>
Cc: Philipp <philipp+openbsd@bureaucracy.de>
Date: Thu, 14 Mar 2024 09:45:35 +1300

On Thu, 14 Mar 2024 at 9:10 AM, gilles via tech <tech@openbsd.org> wrote:

> March 13, 2024 7:27 PM, "Philipp" <philipp+openbsd@bureaucracy.de> wrote:
>
> > Hi
> >
> > Someone asked for the ORIGINAL_RECIPIENT environment variable for mdas.
> > This is set by postfix[0] and some mda (i.e. public-inbox[1]) use them
> > to handle there mails.
> >
> > I have implemented this and also add some documentation for the mda
> > interface.
> >
> > Philippp
> >
> > [0] https://www.postfix.org/local.8.html
> > [1] https://public-inbox.org/public-inbox-mda.html
> >
>
> Yes, this makes sense.
>
> Will commit if there's no objection.
>
>
>
> > diff --git a/usr.sbin/smtpd/mda_unpriv.c b/usr.sbin/smtpd/mda_unpriv.c
> > index 1d59550aead..d2e67f66164 100644
> > --- a/usr.sbin/smtpd/mda_unpriv.c
> > +++ b/usr.sbin/smtpd/mda_unpriv.c
> > @@ -28,7 +28,7 @@ mda_unpriv(struct dispatcher *dsp, struct deliver
> *deliver,
> > const char *pw_name, const char *pw_dir)
> > {
> > int idx;
> > - char *mda_environ[11];
> > + char *mda_environ[12];
> > char mda_exec[LINE_MAX];
> > char mda_wrapper[LINE_MAX];
> > const char *mda_command;
> > @@ -54,6 +54,7 @@ mda_unpriv(struct dispatcher *dsp, struct deliver
> *deliver,
> > xasprintf(&mda_environ[idx++], "PATH=%s", _PATH_DEFPATH);
> > xasprintf(&mda_environ[idx++], "DOMAIN=%s", deliver->rcpt.domain);
> > xasprintf(&mda_environ[idx++], "HOME=%s", pw_dir);
> > + xasprintf(&mda_environ[idx++], "ORIGINAL_RECIPIENT=%s@%s",
> deliver->rcpt.user,
> > deliver->rcpt.domain);
> > xasprintf(&mda_environ[idx++], "RECIPIENT=%s@%s", deliver->dest.user,
> deliver->dest.domain);
> > xasprintf(&mda_environ[idx++], "SHELL=/bin/sh");
> > xasprintf(&mda_environ[idx++], "LOCAL=%s", deliver->rcpt.user);
> > diff --git a/usr.sbin/smtpd/smtpd.conf.5 b/usr.sbin/smtpd/smtpd.conf.5
> > index 257ad172dc4..cf5e7b261f6 100644
> > --- a/usr.sbin/smtpd/smtpd.conf.5
> > +++ b/usr.sbin/smtpd/smtpd.conf.5
> > @@ -1113,6 +1113,30 @@ For example, with recipient
> > .It %{rcpt} Ta expands to Dq user+t:g@example.org
> > .It %{rcpt:raw} Ta expands to Dq user+t?g@example.org
> > .El
> > +.Ss MDA ENVIRONMENT
> > +When a MDA is invoced smtpd will create a new process.


Invoked?

>
> > +Only the uid and gid of the destination user is set.
> > +The following environment variables will be set:
> > +.Bl -tag -width "ORIGINAL_RECIPIENT"
> > +.It Ev DOMAIN
> > +The recipient domain
> > +.It Ev HOME
> > +The home directory of the destination user
> > +.It Ev RECIPIENT
> > +The address of the final recipient
> > +.It Ev ORIGINAL_RECIPIENT
> > +The address of the original recipient
> > +.It Ev EXTENSION
> > +The sub address of the recipient (only set when the recipient has a sub
> address)
> > +.It Ev SENDER
> > +The address of the sender (might be empty)
> > +.El
> > +.Pp
> > +This process gets the mail piped to
> > +.Xr stdin 3 .
> > +A mail is considered as deliverd when the mda exit with EX_OK and


delivered

>
> > +.Xr stdin 3
> > +is completly read.


completely

>
> > .Sh FILES
> > .Bl -tag -width "/etc/mail/smtpd.confXXX" -compact
> > .It Pa /etc/mail/smtpd.conf
>
>