/usr/share/irssi/scripts/ircsec.pl is in irssi-scripts 20120326.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | # by Stefan 'tommie' Tomanek
use strict;
use Irssi 20020324;
use Irssi::TextUI;
use Crypt::CBC;
use Digest::MD5 qw(md5 md5_hex md5_base64);;
use vars qw($VERSION %IRSSI);
$VERSION = '2008051101';
%IRSSI = (
authors => 'Stefan \'tommie\' Tomanek',
contact => 'stefan@pico.ruhr.de',
name => 'IRCSec',
description => 'secures your conversation',
license => 'GPLv2',
changed => $VERSION,
modules => 'Crypt::CBC Digest::MD5',
sbitems => 'ircsec',
commands => "ircsec",
);
use vars qw(%channels);
sub draw_box ($$$$) {
my ($title, $text, $footer, $colour) = @_;
my $box = '';
$box .= '%R,--[%n%9%U'.$title.'%U%9%R]%n'."\n";
foreach (split(/\n/, $text)) {
$box .= '%R|%n '.$_."\n";
}
$box .= '%R`--<%n'.$footer.'%R>->%n';
$box =~ s/%.//g unless $colour;
return $box;
}
sub show_help() {
my $help=$IRSSI{name}." ".$VERSION."
/ircsec secure <key>
Encrypt and decrypt conversation in current channel/query with <key>
/ircsec unlock
Disable de/encryption
/ircsec toggle
Temporary dis- or enable security
";
my $text = '';
foreach (split(/\n/, $help)) {
$_ =~ s/^\/(.*)$/%9\/$1%9/;
$text .= $_."\n";
}
print CLIENTCRAP &draw_box($IRSSI{name}." help", $text, "help", 1) ;
}
sub encrypt ($$$) {
my ($text, $key, $algo) = @_;
my $cipher;
eval {
$cipher = Crypt::CBC->new( -key => $key,
-cipher => $algo,
-iv => '$KJh#(}q',
-literal_key => 0,
-padding => 'space',
-header => 'randomiv'
);
};
return unless $cipher;
my $checksum = md5_base64($text);
my $ciphertext = $cipher->encrypt_hex($text." ".$checksum);
return $ciphertext;
}
sub decrypt ($$$) {
my ($data, $key, $algo) = @_;
my $cipher;
eval {
$cipher = Crypt::CBC->new( -key => $key,
-cipher => $algo,
-iv => '$KJh#(}q',
-literal_key => 0,
-padding => 'space',
-header => 'randomiv'
);
};
return unless $cipher;
my $plaintext = $cipher->decrypt_hex($data);
my ($text, $checksum) = $plaintext =~ /^(.*) (.*?)$/;
if ($checksum eq md5_base64($text)) {
return $text;
} else {
return undef;
}
}
sub sig_send_text ($$$) {
my ($line, $server, $witem) = @_;
return unless ref $witem;
my $tag = $witem->{server}->{tag};
if (defined $channels{$tag}{$witem->{name}} && $channels{$tag}{$witem->{name}}{active}) {
my $key = $channels{$tag}{$witem->{name}}{key};
Irssi::signal_stop();
my $cipher = Irssi::settings_get_str('ircsec_default_cipher');
my $crypt = encrypt($line, $key, $cipher);
# if (defined $crypt) {
Irssi::signal_continue("[IRCSec:".$cipher."] ".$crypt, $server, $witem);
# } else {
# $witem->print("%R[IRCSec]>%n Unknown cipher method '".$cipher."'", MSGLEVEL_CLIENTCRAP);
# }
}
}
sub decode ($$$) {
my ($server, $text, $target) = @_;
return unless ($text =~ /^\[IRCSec(:(.*?))?\] ([\d\w]+)/);
my $string = $3;
my $cipher = $2;
$cipher = Irssi::settings_get_str('ircsec_default_cipher') unless $cipher;
my $witem = $server->window_item_find($target);
return unless ref $witem;
return unless defined $channels{$server->{tag}}{$target};
my $key = $channels{$server->{tag}}{$target}{key};
my $plain = decrypt($string, $key, $cipher);
if (defined $plain) {
$witem->print("%B[IRCSec:".$cipher."]>%n $plain", MSGLEVEL_CLIENTCRAP);
} else {
$witem->print("%R[IRCSec]>%n Unknown cipher method '".$cipher."' or wrong key", MSGLEVEL_CLIENTCRAP);
}
}
sub sb_ircsec ($$) {
my ($item, $get_size_only) = @_;
my $win = !Irssi::active_win() ? undef : Irssi::active_win()->{active};
my $line;
if (ref $win && ($win->{type} eq "CHANNEL" || $win->{type} eq "QUERY")){
my $name = $win->{name};
my $tag = $win->{server}->{tag};
if ($channels{$tag}{$name} && $channels{$tag}{$name}{active}) {
$line = "%G%Uo-m%U%n";
} elsif ($channels{$tag}{$name}){
$line = "%Ro-m%n";
}
}
my $format = "{sb ".$line."}";
$item->{min_size} = $item->{max_size} = length($line);
$item->default_handler($get_size_only, $format, 0, 1);
$item->default_handler($get_size_only, $format, 0, 1);
}
sub cmd_ircsec ($$$) {
my ($args, $server, $witem) = @_;
my @arg = split(/ /, $args);
if (@arg == 0 || $arg[0] eq 'help') {
# do some stuff
show_help();
} elsif ($arg[0] eq 'secure') {
shift @arg;
return unless ref $witem;
if (@arg) {
my $key = join(' ', @arg);
if (length($key) < 8) {
$witem->print("%R>>%n Key must be a minimum of 8 characters", MSGLEVEL_CLIENTCRAP);
} else {
$channels{$server->{tag}}{$witem->{name}}{key} = join(' ', @arg);
$channels{$server->{tag}}{$witem->{name}}{active} = 1;
$witem->print("%B>>%n %Go-m%n Conversation secured", MSGLEVEL_CLIENTCRAP);
}
} else {
$witem->print("%R>>%n Please specify a key", MSGLEVEL_CLIENTCRAP);
}
Irssi::statusbar_items_redraw('ircsec');
} elsif ($arg[0] eq 'unlock') {
delete $channels{$server->{tag}}{$witem->{name}};
$witem->print("%B>>%n %Ro-m%n Security disabled", MSGLEVEL_CLIENTCRAP);
Irssi::statusbar_items_redraw('ircsec');
} elsif ($arg[0] eq 'toggle') {
return unless ref $witem;
if ($channels{$server->{tag}}{$witem->{name}}) {
$channels{$server->{tag}}{$witem->{name}}{active} = not $channels{$server->{tag}}{$witem->{name}}{active};
Irssi::statusbar_items_redraw('ircsec');
}
}
}
Irssi::signal_add('message private', sub { decode($_[0], $_[1], $_[2]); });
Irssi::signal_add('message public', sub { decode($_[0], $_[1], $_[4]); });
Irssi::signal_add('message own_private', sub { decode($_[0], $_[1], $_[2]); });
Irssi::signal_add('message own_public', sub { decode($_[0], $_[1], $_[2]); });
Irssi::signal_add_first('send text', "sig_send_text");
Irssi::signal_add('window changed', sub { Irssi::statusbar_items_redraw('ircsec'); });
Irssi::signal_add('window item changed', sub { Irssi::statusbar_items_redraw('ircsec'); });
Irssi::statusbar_item_register('ircsec', 0, 'sb_ircsec');
Irssi::settings_add_str($IRSSI{name}, 'ircsec_default_cipher', 'Blowfish');
Irssi::command_bind('ircsec', \&cmd_ircsec);
foreach my $cmd ('unlock', 'secure', 'toggle') {
Irssi::command_bind('ircsec '.$cmd => sub {
cmd_ircsec("$cmd ".$_[0], $_[1], $_[2]); });
}
print CLIENTCRAP "%B>>%n ".$IRSSI{name}." ".$VERSION." loaded: /ircsec help for help";
|