passfail.pl – Prevent password entry in IRSSI

Here is a little irssi script that will help prevent you entering your passwords into IRSSI

Click here to download the script: passfail.pl

Instructions are inside the file and below:

[perl]
use strict;
use Digest::MD5 qw(md5 md5_hex md5_base64);
use vars qw($VERSION %IRSSI);

#——————————————————————————
# passfail.pl – Help prevent you entering your passwords into IRC by mistake
#
# Copyright (C) 2010 Christopher Carey
# http://chriscarey.com
#
#——————————————————————————
# INSTALL:
#
# Stick the script passfail.pl into your .irssi/scripts/ directory.
# Symlink it into the autorun directory so it will run every time the
# application starts.
#
# cp passfail.pl .irssi/scripts/
# cd .irssi/scripts/
# ln -s passfail.pl autorun/
#
#——————————————————————————
# USAGE:
#
# Passfail has three basic commands: add, remove, show, and clearall.
#
# /passfail add <password>
#
# The previous command will add the password into the list of protected words.
# That password, if entered in the chat window, will not be sent to channel.
#
# /passfail remove <password>
#
# The previous command will remove the password from the list of protected words.
# If you type the password, it will be sent to channel.
#
# /passfail show
#
# The previous command will show the saved password hashes
#
# /passfail clearall
#
# The previous command will clear the list of protected words (start over).
#
#——————————————————————————
#
# TESTING:
#
# Test and configure on the (status) window, and not in a channel with users in it!
#
#——————————————————————————
#
# OTHER NOTES:
#
# You can manually load or unload the script with the following commands:
#
# /script load passfail.pl
# /script unload passfail
#
#

$VERSION = ‘20100804’;
%IRSSI = (
authors => ‘Chris Carey’,
contact => ‘chris@chriscarey.com’,
name => ‘passfail’,
description => ‘Prevent your password(s) from going over the wire accidentally’,
license => ‘BSD’,
url => ‘none’,
modules => ‘Digest::MD5’
);

my @password_md5s;

sub settings_register () {
# register the irssi settings (with defaults)
Irssi::settings_add_str("passfail", "passfail_hashes", "");
}

sub event_send_text () {

my ($line, $server_rec, $wi_item_rec) = @_;

# convert the input line to an array of strings
my @linearray = split(/ /, $line);
my @linearray_md5 = map { md5_hex($_) => $_ } @linearray;

# md5_hex each of the linearray elements
my %linearray_md5 = ();
map { $linearray_md5{$_} = 1 } @linearray_md5;

# compare each item in the array against the password hashes
my @intersection = grep { $linearray_md5{$_} } @password_md5s;
my $intersection_size = @intersection;

# compare the input to the array of password hashes
if ($intersection_size gt 0) {
# user entered password
Irssi::print("passfail.pl blocking password entry");
} else {
# user did not enter password
return;
}
Irssi::signal_stop();
}

sub display_hashes {
foreach(@password_md5s) {
Irssi::print($_);
}
}

sub settings_load {
# convert the comma separated hash list into an array
@password_md5s = split(‘,’, Irssi::settings_get_str(‘passfail_hashes’));
Irssi::print(scalar(@password_md5s)." password(s) loaded");
}

sub settings_save {
# convert the array to a comma seperated hash list and store it
my $hashes = join(‘,’, @password_md5s);
Irssi::settings_set_str(‘passfail_hashes’, $hashes);
Irssi::print(scalar(@password_md5s)." password(s) saved");
}

sub cmd_passfail {
# user typed the command /passfail

my $usage = "/passfail [add|remove|show|clearall] <password>";
my ($arguments, $server, $witem) = @_;
my @foo = split(/ /, $arguments);
my $cmd = @foo[0];
my $pw = @foo[1];
my $pw_md5 = md5_hex($pw);

# sanity check on inputs
if (!$arguments) {
Irssi::print($usage);
return;
}
if (length($cmd) eq 0 || length($pw eq 0)) {
Irssi::print($usage);
return;
}

# switch based on which command was specified
if ($cmd eq "add") {
# add password
if (grep(/$pw_md5/, @password_md5s)) {
Irssi::print("Password already exists");
} else {
Irssi::print("Adding new password…");
push(@password_md5s, $pw_md5);
&settings_save();
}
} elsif ($cmd eq "remove") {
# remove password
Irssi::print("Removing password…");
@password_md5s = grep { $_ ne $pw_md5 } @password_md5s;
&settings_save();

} elsif ($cmd eq "show") {
# display hashes
&display_hashes();

} elsif ($cmd eq "clearall") {
# clear all passwords
Irssi::print("Clearing all passwords…");
splice(@password_md5s);
&settings_save();

} else {
# invalid input, show usage
Irssi::print($usage);
}
}

# program start
settings_register();
settings_load();
Irssi::signal_add_first(‘send text’, "event_send_text");
Irssi::command_bind("passfail", "cmd_passfail");

[/perl]