package Echolot::Tools; # (c) 2002 Peter Palfrader # $Id: Tools.pm,v 1.7 2002/07/17 17:06:44 weasel Exp $ # =pod =head1 Name Echolot::Tools - Tools for echolot =head1 DESCRIPTION =cut use strict; use Carp qw{cluck}; use Digest::MD5 qw{}; sub hash($) { my ($data) = @_; ($data) = $data =~ m/(.*)/s; # untaint my $hash = Digest::MD5::md5_hex($data); return $hash; }; sub make_random($;%) { my ($length, %args) = @_; my $random; open (FH, Echolot::Config::get()->{'dev_random'}) or cluck("Cannot open ".Echolot::Config::get()->{'dev_random'}." for reading: $!"), return 0; read(FH, $random, $length) or cluck("Cannot read from ".Echolot::Config::get()->{'dev_random'}.": $!"), return 0; close (FH) or cluck("Cannot close ".Echolot::Config::get()->{'dev_random'}.": $!"), return 0; $random = unpack('H*', $random) if ($args{'armor'} == 1); return $random; }; sub make_mac($) { my ($token) = @_; my $mac = hash($token . Echolot::Globals::get()->{'storage'}->get_secret() ); return $mac; }; sub makeShortNumHash($) { my ($text) = @_; my $hash = Echolot::Tools::make_mac($text); $hash = substr($hash, 0, 4); my $sum = hex($hash); return $sum; }; sub verify_mac($$) { my ($token, $mac) = @_; return (hash($token . Echolot::Globals::get()->{'storage'}->get_secret() ) eq $mac); }; sub make_address($) { my ($subsystem) = @_; my $token = $subsystem.'='.time(); my $hash = hash($token . Echolot::Globals::get()->{'storage'}->get_secret() ); my $cut_hash = substr($hash, 0, Echolot::Config::get()->{'hash_len'}); my $complete_token = $token.'='.$cut_hash; my $address = Echolot::Config::get()->{'my_localpart'}. Echolot::Config::get()->{'recipient_delimiter'}. $complete_token. '@'. Echolot::Config::get()->{'my_domain'}; return $address; }; sub verify_address_tokens($) { my ($address) = @_; my $delimiter = quotemeta( Echolot::Config::get()->{'recipient_delimiter'}); my ($type, $timestamp, $received_hash) = $address =~ /$delimiter (.*) = (\d+) = ([0-9a-f]+) @/x or cluck("Could not parse to header '$address'"), return undef; my $token = $type.'='.$timestamp; my $hash = Echolot::Tools::hash($token . Echolot::Globals::get()->{'storage'}->get_secret() ); my $cut_hash = substr($hash, 0, Echolot::Config::get()->{'hash_len'}); ($cut_hash eq $received_hash) or cluck("Hash mismatch in '$address'"), return undef; return { timestamp => $timestamp, token => $type }; }; sub send_message(%) { my (%args) = @_; defined($args{'To'}) or cluck ('No recipient address given'), return 0; $args{'Subject'} = '' unless (defined $args{'Subject'}); $args{'Body'} = '' unless (defined $args{'Body'}); if (defined $args{'Token'}) { $args{'From'} = make_address( $args{'Token'} ); } else { $args{'From'} = Echolot::Config::get()->{'my_localpart'}. '@'. Echolot::Config::get()->{'my_domain'}; }; $args{'Subject'} = 'none' unless (defined $args{'Subject'}); my @lines = map { $_."\n" } split (/\r?\n/, $args{'Body'}); open(SENDMAIL, '|'.Echolot::Config::get()->{'sendmail'}.' -f '.$args{'From'}.' -t') or cluck("Cannot run sendmail: $!"), return 0; printf SENDMAIL "From: %s\n", $args{'From'}; printf SENDMAIL "To: %s\n", $args{'To'}; printf SENDMAIL "Subject: %s\n", $args{'Subject'}; printf SENDMAIL "\n"; for my $line (@lines) { print SENDMAIL $line; }; close SENDMAIL; return 1; }; 1; # vim: set ts=4 shiftwidth=4: