Mail::Run::Crypt - Encrypt and mail output from command runs
This module runs a system command with 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) program provided by this distribution, which includes a means to set the properties for the module via environment variables or command line options.
use Mail::Run::Crypt; ... my $mrc = Mail::Run::Crypt->new( mailto => 'firstname.lastname@example.org', ); $mrc->run($command, @args); ... my $mrc = Mail::Run::Crypt->new( sign => 1, keyid => '0x1234DEAD5678BEEF', passphrase => 'able was i ere i saw elba', mailto => 'email@example.com', ); $mrc->run($command, @args);
Constructor method; accepts the following named parameters:
The recipient email address for the content. This is always required.
Whether to encrypt the command output. This defaults to 1.
Whether to sign the command output. This defaults to 0. A
passphrasewill 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.
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 8-byte ("long") hexadecimal ID prefixed with
0xis probably the best way.
The passphrase used to decrypt the key. This is required for signing, and has no effect without
(Optional) The name of the object. When called from the runcrypt(1) program, this will be the string "runcrypt". Otherwise, it will default to this package's name.
Run the specified arguments as a command with 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() to get the actual exit code if needed.
Return the exit status of the most recently run command, or 127 if no command has been successfully run.
mailtoproperty was not passed in the constructor.
keyid required for signing
Signing was specified, but no
keyidattribute was passed in the constructor.
passphrase required for signing
Signing was specified, but no
passphraseattribute 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.
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:
This module uses Mail::GnuPG and other GnuPG-specific code, so it won't work with other OpenPGP implementations.
Definitely. This code is not production-ready. The test suite coverage is still not great, but should improve in newer versions.
Copyright (C) 2017 Tom Ryder
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