Add masterkey.pl

Signed-off-by: Florian Pritz <bluewind@xinu.at>

1 files changed, 176 insertions, 0 deletions

diff --git a/masterkey.pl b/masterkey.pl
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+++ b/masterkey.pl
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+#!/usr/bin/perl
+use warnings;
+use strict;
+use v5.10;
+
+use Data::Dumper;
+use Email::Date;
+use Email::MessageID;
+use Getopt::Long;
+use GnuPG::Interface;
+use JSON;
+use Mail::GPG;
+use MIME::Entity;
+use Pod::Usage;
+use String::Random qw(random_string);
+use Text::Template;
+use Try::Tiny;
+
+=head1 NAME
+
+masterkey.pl
+
+=head1 SYNOPSIS
+
+masterkey.pl [options] <keyid ...>
+
+Send verification mails to the owners of the listed GPG keys.
+
+ Options:
+   --help, -h             short help message
+   --dry-run, -n          do not perform any permanent actions
+   --from, -f <gpg id>    GPG ID used to send the email
+   --tokenfile <file>     Record tokens in this file
+   --debug                Output debugging information
+
+=cut
+
+sub main {
+my $mail_subject = 'Master Key Verification for {$recipient_name} ({$recipient_key})';
+my $mail_template = 'Hi,
+
+This mail is about having your GPG key signed by an Arch Linux master key.
+Please reply with an email that is signed with your key ({$recipient_key})
+and contains the token listed below.
+
+Your token: {$token}
+
+Best Regards,
+SAMKIVS (Simple Automated Master Key Identity Verification System)
+on behalf of {$sender_name} ({$sender_key})
+';
+
+	my %opts = ();
+
+	Getopt::Long::Configure ("bundling");
+	GetOptions(\%opts, "help|h", "dry-run|n", "from|f=s", "tokenfile=s", "debug") or pod2usage(2);
+	pod2usage(0) if $opts{help};
+	pod2usage(-verbose => 0) if (@ARGV== 0);
+
+	# TODO: print all errors at once
+	die "Error: --from option is required but not set\n" if not $opts{from};
+	die "Error: --tokenfile option is required but not set\n" if not $opts{tokenfile};
+
+	for my $id (@ARGV) {
+		say STDERR "Processing $id";
+		try {
+			my $token = random_string('.' x 25);
+
+			my $msg = build_email($opts{from}, $id, $mail_subject, $mail_template, $token);
+
+			save_token($id, $token, $opts{tokenfile}) unless $opts{'dry-run'};
+			send_email($msg) unless $opts{'dry-run'};
+			say $msg->as_string if $opts{debug};
+		} catch {
+			warn "$_\nSkipping $id due to uncaught error\n";
+		}
+	}
+}
+
+sub save_token {
+	my $id = shift;
+	my $token = shift;
+	my $file = shift;
+
+	open my $fh,  '>>', $file or die "Failed to open '$file': $!";
+	say $fh "$id $token";
+	close $fh;
+}
+
+sub fill_template {
+	my $template = shift;
+	my $values = shift;
+
+	my $result = Text::Template::fill_in_string($template, HASH => $values)
+		or die "Failed to fill in template: $Text::Template::ERROR";
+
+	return $result;
+}
+
+sub gpg_get_user {
+	my $key = shift;
+
+	my $gpg = GnuPG::Interface->new();
+	my @keys = $gpg->get_public_keys($key);
+
+	die "No key found" if 0+@keys == 0;
+
+	my $user = $keys[0]->user_ids_ref->[0]->as_string;
+
+	unless ($user =~ m/^(?<name>.*?) (?:\((?<comment>.*?)\) )?\<(?<email>.*?@.*?)\>$/) {
+		die "Failed to parse GPG user information for key $key";
+	}
+
+	my $name = $+{name};
+	my $email = $+{email};
+
+	return ($name, $email);
+}
+
+sub build_email {
+	my $sender_key = shift;
+	my $recipient_key = shift;
+	my $subject = shift;
+	my $body = shift;
+	my $token = shift;
+
+	# get from gpg keys
+	my ($sender_name, $sender_addr) = gpg_get_user($sender_key);
+	my ($recipient_name, $recipient_addr) = gpg_get_user($recipient_key);
+
+	my %values;
+	$values{token} = $token;
+	$values{sender_key} = $sender_key;
+	$values{sender_name} = $sender_name;
+	$values{sender_addr} = $sender_addr;
+	$values{recipient_key} = $recipient_key;
+	$values{recipient_name} = $recipient_name;
+	$values{recipient_addr} = $recipient_addr;
+
+	$subject = fill_template($subject, \%values);
+	$body = fill_template($body, \%values);
+
+	my $mgpg = Mail::GPG->new(
+		default_key_id => $sender_key,
+		default_passphrase => '',
+	);
+
+	my $msg = MIME::Entity->build(
+		From => Encode::encode('iso-8859-1', $sender_name). " <$sender_addr>",
+		To   => $recipient_addr,
+		Subject => Encode::encode('iso-8859-1', $subject),
+		# TODO: necessary?
+		#TimeZone => 'Europe/Vienna',
+		Encoding => 'quoted-printable',
+		Charset => 'utf8',
+		Date => Email::Date::format_date(),
+		Data => [$body],
+	);
+
+	$msg->add("Message-ID", Email::MessageID->new->in_brackets);
+	$msg->replace("Return-Path", "<$sender_addr>");
+
+	return $mgpg->mime_sign_encrypt(
+		entity => $msg,
+		recipients => [$sender_key, $recipient_key],
+	);
+}
+
+sub send_email {
+	my $msg = shift;
+	open my $mail, "|msmtp -t";
+	print $mail $msg->as_string;
+	close $mail;
+}
+
+main();