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cypher_old.pl
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cypher_old.pl
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#!/usr/bin/perl
use v5.10;
use warnings;
use strict;
use autodie;
use Storable qw(freeze thaw);
use Data::Dumper;
use Switch;
use Carp;
use Crypt::Rijndael;
use Term::ReadLine;
use Getopt::Long;
use Pod::Usage;
my $STANDBY_TIMEOUT = 300;
my $last_user_active :shared = time();
GetOptions(
'encrypt|enc|e' => sub {enc_cmd(\&encrypt)},
'decrypt|dec|d' => sub {enc_cmd(\&decrypt)},
'help' => sub {pod2usage(-verbose => 2)},
) or pod2usage();
my $term = Term::ReadLine->new('Cypher')
or croak "Term Readline error";
my $filename = shift
or pod2usage();
my $cypher = mk_cypher($term, $filename);
my $data = load_data($cypher, $filename);
while(1) {
my $line = $term->readline('cypher > ');
last if !defined $line;
last if (time() - $last_user_active > $STANDBY_TIMEOUT);
$last_user_active = time();
$line = trim($line);
next unless $line;
my ($cmd,@args) = split(/\s+/,$line,3);
switch($cmd) {
case "search" { search(@args) }
case "get" { get(@args) }
case "put" { put(@args) }
case "del" { del(@args)}
case "help" {help(@args)}
else { say "No such command '$cmd'\n" }
}
}
system('clear');
exit 0;
########## Data Storage functions #########################
sub put {
my $key = shift;
my $val = shift;
unless ($key && $val) {
say "syntax: put KEY VAL";
return;
}
$data->{$key} = $val;
say "$key stored";
store_data($cypher, $data, $filename);
}
sub get {
my $re = shift;
unless($re) {
say "syntax: get REGEXP";
return;
}
my @keys = grep{$_ =~ /^$re$/}(sort keys %$data);
unless(scalar(@keys)) {
say "No keys matching '$re' found!";
return;
}
foreach my $key(@keys) {
say "$key: ".$data->{$key};
}
}
sub del {
my $key = shift;
my $val = $data->{$key};
if ($data->{$key}) {
delete $data->{$key};
say "$key: $val deleted";
store_data($cypher, $data, $filename);
} else {
say "No such key '$key' found";
}
}
sub search {
my $re = shift || '';
my @keys = grep{$_ =~ /$re/}(sort keys %$data);
say join("\n", @keys);
}
########### Encrypter functions #############################
sub mk_cypher {
my $term = shift;
my $filename = shift;
my $key = read_password($term, $filename);
my $cypher = Crypt::Rijndael->new( $key, Crypt::Rijndael::MODE_CBC() );
return $cypher;
}
sub enc_cmd {
my $func = shift;
my $filename = shift @ARGV;
defined $filename && -f $filename
or pod2usage(-verbose => 99, -sections=>["SYNOPSIS", "ARGUMENTS"]);
my $data = read_file($filename);
my $cypher = mk_cypher($term, $filename);
$data = &$func($cypher, $data);
binmode(STDOUT);
print $data;
exit(0);
}
sub encrypt {
my $cypher = shift;
my $data = shift;
my $pad = '~' x (16 - (length($data) % 16));
$data .= $pad;
return length($pad)."-".$cypher->encrypt($data);
}
sub decrypt {
my $cypher = shift;
my $data = shift;
(my $pad_length,$data) = split(/-/,$data,2);
$data = $cypher->decrypt($data);
$data = substr($data, 0, -1*$pad_length);
return $data;
}
sub read_password {
my $term = shift;
my $filename = shift;
my $term_attribs = $term->Attribs;
$term_attribs->{redisplay_function} = $term_attribs->{shadow_redisplay};
my $key = $term->readline("Enter Password for $filename: ");
$term->remove_history($term->where_history);
$term_attribs->{redisplay_function} = undef;
$key .= '~' x (32 - length($key));
$term_attribs->{completion_function} = \&autocomplete;
return $key;
}
########### Data I/O functions ##############################
sub load_data {
my $cypher = shift;
my $filename = shift;
unless(-f $filename) {
return {};
}
my $data = read_file($filename);
$data = decrypt($cypher,$data);
return thaw($data);
}
sub store_data {
my $cypher = shift;
my $data = shift;
my $filename = shift;
my $ice = encrypt($cypher,freeze($data));
write_file($ice,$filename);
return 1;
}
sub read_file {
my $filename = shift;
open(my $file, "<$filename");
binmode($file);
my $fsize = -s $filename;
my $data = '';
my $bytes_read = sysread($file, $data, $fsize) || 0;
$bytes_read == $fsize
or croak("Can't load $file: $!");
close($file);
return $data;
}
sub write_file {
my $data = shift;
my $filename = shift;
open(my $file, ">$filename");
binmode($file);
syswrite($file, $data)
or croak("Write $file failed: $!");
close($file);
}
############# Auto completion ###############################
sub autocomplete {
my $text = shift;
my $line = shift;
my $start = shift;
my $end = shift;
$line = trim($line);
my ($cmd,@args) = split(/\s+/, $line);
$cmd ||= '';
push @args, $text if $text eq '';
# print "ac: $text,$line\t$cmd,'".scalar(@args)."'\n";
if (@args) {
if ($cmd =~ /^(search|get|del|put)$/) {
return undef if @args > 1;
return $term->completion_matches($text,\&keyword);
}
} else {
my @all_commands = qw(put get search del help);
return grep { /^\Q$text/ } (sort @all_commands);
}
return undef;
}
{
my @words = ();
my $i;
sub keyword {
my ($text, $state) = @_;
# return unless $text;
if($state) {
$i++;
} else { # first call
$i = 0;
@words = sort keys %$data;
}
for (; $i < scalar(@words); $i++) {
return $words[$i] if $words[$i] =~ /^\Q$text/;
};
return undef;
}
};
sub trim {
my $s = shift;
$s =~ s/^\s+|\s+$//g;
return $s;
}
=pod
=head1 NAME
=over
Cypher - command line cypher tool to work with encrypted key-value storage. Can be used to encrypt and decrypt whole files
=back
=head1 SYNOPSIS
=over
./cypher [-ed] I<filename>
By default goes into Secure Storage Mode - loads encrypted file and provides interface to manipulate it. See L</USER COMMANDS>. If -e or -d options provided, cypher works as encrypter or decrypter accordingly, dumps its result to STDOUT and exits immediately.
=back
=head1 ARGUMENTS
=over
=item -e I<filename>
Read unencrypted I<filename> and dump it encrypted to STDOUT
=back
=over
=item -d I<filename>
Read encrypted I<filename> and dump it decrypted to STDOUT
=back
=head1 USER COMMANDS
Following commands available in Secure Storage Mode:
=over
=item * put KEY VAL
Puts pair KEY:VAL into storage
=back
=over
=item * get REGEXP
Dumps all data for keys matching perl regexp /^REGEXP\$/
=back
=over
=item * search MASK
Searches and shows all keys, containing MASK as substring
=back
=over
=item * del KEY
Deletes key KEY from storage
=back
=head1 STORAGE MODE FEATURES
You can use <TAB> for autocompletion for commands and data keys
=cut