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Pigeonhole Sieve Pipe Plugin
============================

The sieve_pipe plugin adds the vnd.dovecot.pipe extension to the Sieve language
[http://www.sieve.info]. The extension adds a new action command for piping
messages to a pre-defined set of external programs. To mitigate the security
concerns, the external programs cannot be chosen arbitrarily; the available
programs are restricted through administrator configuration.

This plugin is available for <Pigeonhole.txt> v0.2. This plugin is superseded
by the <Extprograms> [Pigeonhole.Sieve.Plugins.Extprograms.txt] plugin for
Pigeonhole v0.3 and beyond.

Getting the sources
-------------------

Currently, the sources of the sieve_pipe plugin are not released, but you can
get them from the the Mercurial repository:

---%<-------------------------------------------------------------------------
hg clone  http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe/
---%<-------------------------------------------------------------------------

Compiling
---------

If you downloaded the sources of this plugin using Mercurial, you will need to
execute './autogen.sh' first to build the automake structure in your source
tree. This process requires autotools and libtool to be installed.

If you installed Dovecot from sources, the plugin's configure script should be
able to find the installed 'dovecot-config' automatically, along with the
Pigeonhole development headers:

---%<-------------------------------------------------------------------------
./configure
make
sudo make install
---%<-------------------------------------------------------------------------

If this doesn't work, you can use '--with-dovecot=<path>' configure option,
where the path points to a directory containing 'dovecot-config' file. This can
point to an installed file:

---%<-------------------------------------------------------------------------
./configure --with-dovecot=/usr/local/lib/dovecot
make
sudo make install
---%<-------------------------------------------------------------------------

The above example should also find the necessary Pigeonhole development headers
implicitly. You can also compile by pointing to compiled Dovecot and Pigeonhole
source trees:

---%<-------------------------------------------------------------------------
./configure --with-dovecot=../dovecot-2.0.0/
--with-pigeonhole=../dovecot-2.0-pigeonhole-0.2.0
make
sudo make install
---%<-------------------------------------------------------------------------

Configuration
-------------

This package builds and installs the sieve_pipe plugin for Pigeonhole Sieve.
The plugin is activated by adding it to the sieve_plugins setting:

---%<-------------------------------------------------------------------------
sieve_plugins = sieve_pipe
---%<-------------------------------------------------------------------------

The plugin can directly pipe a message to an external program (typically a
shell script) by forking a new process. Alternatively, it can connect to a Unix
socket behind which a Dovecot script service is listening to start the external
program, e.g. to execute as a different user or for added security.

The program name specified for the Sieve "pipe" command is used to find the
program or socket in a configured directory. Separate directories are specified
for the sockets and the directly executed binaries. The socket directory is
searched first. Since the Sieve "pipe" command refuses "/" in program names, it
is not possible to build a hierarchical structure.

Directly forked programs are executed with a limited set of environment
variables: HOME, USER, SENDER, RECIPIENT and ORIG_RECIPIENT. Programs executed
through the script-pipe socket service currently have no environment set at
all.

The following configuration settings are used by the sieve_pipe plugin:

sieve_pipe_socket_dir = :
  Points to a directory relative to the Dovecot base_dir where the sieve_pipe
  plugin looks for the sockets.

sieve_pipe_bin_dir = :
  Points to a directory where the sieve_pipe plugin looks for programs (shell
  scripts) to execute directly and pipe messages to.

Example of socket service

---%<-------------------------------------------------------------------------
plugin {
  sieve = ~/.dovecot.sieve

  sieve_plugins = sieve_pipe

  sieve_pipe_socket_dir = sieve-pipe
}

service sieve-custom-action {
  executable = script-pipe /usr/lib/dovecot/sieve-pipe/sieve-custom-action.sh

  # use some unprivileged user for execution
  user = dovenull

  # socket name is program-name in Sieve (without sieve-pipe/ prefix)
  unix_listener sieve-pipe/sieve-custom-action {
  }
}
---%<-------------------------------------------------------------------------

Example of direct execution

---%<-------------------------------------------------------------------------
plugin {
  sieve = ~/.dovecot.sieve

  sieve_plugins = sieve_pipe

  # This directory contains the scripts that are available.
  sieve_pipe_bin_dir = /usr/lib/dovecot/sieve-pipe
}
---%<-------------------------------------------------------------------------

Usage
-----

Sieve scripts can use the new 'vnd.dovecot.pipe' extension as follows:

---%<-------------------------------------------------------------------------
require ["vnd.dovecot.pipe"];

pipe "external-program";
---%<-------------------------------------------------------------------------

Read the full specification
[http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe/raw-file/tip/doc/rfc/spec-bosch-sieve-pipe.txt]
for more information.

Examples
--------

Example of a jabber notification notify.sieve:

---%<-------------------------------------------------------------------------
require [ "vnd.dovecot.pipe", "copy", "variables" ];
if header :matches "subject" "*" { set "subject" "${1}"; }
if header :matches "from" "*" { set "from" "${1}"; }
pipe :args [ "USER@DOMAIN.TLD", "${from}", "${subject}" ] :copy :try
"jabber_notify.sh" ;
---%<-------------------------------------------------------------------------

The jabber_notify.sh:

---%<-------------------------------------------------------------------------
USER="$1"
FROM="$2"
SUBJECT="$3"
# clix accepts this as a config search directory
# you can use clix - lua based
# http://code.matthewwild.co.uk/clix/summary
# or use any other jabber cmd line client that can send things
export XDG_CONFIG_HOME=/srv/mail
/srv/mail/clix.bin send -q --account=default --to="$USER" "New mail from
${FROM} about ${SUBJECT}"
# we don't care about the exit status in this case
exit 0
---%<-------------------------------------------------------------------------

The $XDG_CONFIG_HOME/.clixrc:

---%<-------------------------------------------------------------------------
[default]
jid=USER@DOMAIN.TLD
password=PASSWORD
---%<-------------------------------------------------------------------------

(This file was created from the wiki on 2019-06-19 12:42)