# NAME Mail::Run::Crypt - Encrypt and mail output from command runs # VERSION Version 0.03 # DESCRIPTION This module runs a system command with [IPC::Run3](https://metacpan.org/pod/IPC::Run3), and collects any standard output and standard error it emits. If there is any standard output or standard error content, it is encrypted and optionally signed with GnuPG, and then each stream's content is mailed separately to a specified recipient address. The idea is to allow you to view the output of automated commands while having the content encrypted as it passes through to your mailserver, and optionally to have some assurance that the content was actually generated by the server concerned. **cron(8)** scripts are the ideal use case, but this would also work with **at(1)**, or anything else that might non-interactively run jobs for which output is significant. You will probably want to call this with the [**runcrypt(1)**](https://metacpan.org/pod/runcrypt) program provided by this distribution, which includes a means to set the properties for the module via environment variables or command line options. # SYNOPSIS use Mail::Run::Crypt; ... my $mrc = Mail::Run::Crypt->new( mailto => 'you@example.net', ); $mrc->run($command, @args); ... my $mrc = Mail::Run::Crypt->new( sign => 1, keyid => '0x1234DEAD5678BEEF', passphrase => 'able was i ere i saw elba', mailto => 'you@example.net', ); $mrc->run($command, @args); # SUBROUTINES/METHODS ## `new(%opts)` Constructor method; accepts the following named parameters: - `mailto` The recipient email address for the content. This is always required. - `encrypt` Whether to encrypt the command output. This defaults to 1. - `sign` Whether to sign the command output. This defaults to 0. A `keyid` and `passphrase` will be required for signing. It is _strongly_ recommended that a dedicated key and passphrase be used for signatures if this is needed. You should carefully consider the consequences of a compromised key. - `keyid` The GnuPG key ID that should be used to sign messages. This is required for signing, and has no effect without `sign`. It can be any means of identifying the key acceptable to GnuPG; the key's 16-byte ("long") hexadecimal ID prefixed with `0x` is probably the best way. - `passphrase` The passphrase used to decrypt the key. This is required for signing, and has no effect without `sign`. - `name` (Optional) The name of the object. When called from the [**runcrypt(1)**](https://metacpan.org/pod/runcrypt) program, this will be the string "runcrypt". Otherwise, it will default to this package's name. ## `run(@command)` Run the specified arguments as a command with [IPC::Run3](https://metacpan.org/pod/IPC::Run3), and email any output or error content to the email recipient, encrypting and/or signing as configured. Returns 1 if the command succeeded, 0 otherwise. Use [`bail()`](#bail) to get the actual exit code if needed. ## `bail()` Return the exit status of the most recently run command, or 127 if no command has been successfully run. # DIAGNOSTICS - `mailto required` The required `mailto` property was not passed in the constructor. - `keyid required for signing` Signing was specified, but no `keyid` attribute was passed in the constructor. - `passphrase required for signing` Signing was specified, but no `passphrase` attribute was passed in the constructor. - `command failed: %s` The command could not be run at all, raising the given error string. This is typically due to problems finding the executable. # CONFIGURATION AND ENVIRONMENT You will need to have a functioning GnuPG public key setup for this to work, including stored keys or a key retrieval system for your recipients. You will also need a secret key if you want to sign the messages. You should _definitely not_ use your personal key for this; generate one specifically for mail signing and encryption instead. I wrote a tutorial on GnuPG key setup, including agent configuration, as part of this series: [https://sanctum.geek.nz/arabesque/series/gnu-linux-crypto/](https://sanctum.geek.nz/arabesque/series/gnu-linux-crypto/) # DEPENDENCIES - Perl v5.10.0 or newer - [Carp](https://metacpan.org/pod/Carp) - [Const::Fast](https://metacpan.org/pod/Const::Fast) - [English](https://metacpan.org/pod/English) - [IPC::Run3](https://metacpan.org/pod/IPC::Run3) - [Mail::GnuPG](https://metacpan.org/pod/Mail::GnuPG) - [MIME::Entity](https://metacpan.org/pod/MIME::Entity) # INCOMPATIBILITIES This module uses [Mail::GnuPG](https://metacpan.org/pod/Mail::GnuPG) and other GnuPG-specific code, so it won't work with other OpenPGP implementations. # BUGS AND LIMITATIONS Definitely. This code is not production-ready. In particular, there is almost no test suite. # AUTHOR Tom Ryder `` # LICENSE AND COPYRIGHT Copyright (C) 2017 Tom Ryder This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License (2.0). You may obtain a copy of the full license at: [http://www.perlfoundation.org/artistic\_license\_2\_0](http://www.perlfoundation.org/artistic_license_2_0) Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license. If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license. This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder. 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