#!/usr/bin/perl

# Written by Simon Josefsson <simon@josefsson.org>.
# Copyright (c) 2010-2013 Yubico AB
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#
#   * Redistributions in binary form must reproduce the above
#     copyright notice, this list of conditions and the following
#     disclaimer in the documentation and/or other materials provided
#     with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use strict;
use DBI;
use POSIX qw(strftime);
use Digest::SHA;

sub usage {
    print "Usage: $0 [--verbose] [--help] [--database DBI] [--db-user USER] [--db-passwd PASSWD]\n";
    print "\n";
    print "Print checksum of important database fields.  Useful for quickly\n";
    print "determining whether several KSMs are in sync.\n";
    print "\n";
    print "  --database DBI: Database identifier, see http://dbi.perl.org/\n";
    print "                  defaults to a MySQL database ykksm on localhost,\n";
    print "                  i.e., dbi:mysql:ykksm.  For PostgreSQL on the local\n";
    print "                  host you can use 'DBI:Pg:dbname=ykksm;host=127.0.0.1'.\n";
    print "\n";
    print "  --db-user USER: Database username to use, defaults to empty string.\n";
    print "\n";
    print "  --db-passwd PASSWD: Database password to use, defaults to empty string.\n";
    print "\n";
    print "Usage example:\n";
    print "\n";
    print "  ./ykksm-checksum --database dbi:mysql:ykksm --db-user user --db-passwd pencil\n";
    print "\n";
    exit 1;
}

#Support dbconfig-common generated database settings, if available
our ($dbuser, $dbpass, $basepath, $dbname, $dbserver, $dbport, $dbtype);
if( -r '/etc/yubico/ksm/config-db.cfg' ) {
    require '/etc/yubico/ksm/config-db.cfg';
} else {
    $dbtype = 'mysql';
    $dbname = 'ykksm';
}

my $verbose = 0;
my $db = "dbi:$dbtype:$dbname";
while ($ARGV[0] =~ m/^-(.*)/) {
    my $cmd = shift @ARGV;
    if (($cmd eq "-v") || ($cmd eq "--verbose")) {
	$verbose = 1;
    } elsif (($cmd eq "-h") || ($cmd eq "--help")) {
	usage();
    } elsif ($cmd eq "--database") {
	$db = shift;
    } elsif ($cmd eq "--db-user") {
	$dbuser = shift;
    } elsif ($cmd eq "--db-passwd") {
	$dbpass = shift;
    }
}

if ($#ARGV>=0) {
    usage();
}

my $dbh = DBI->connect($db, $dbuser, $dbpass, {'RaiseError' => 1});
my $sth = $dbh->prepare ('SELECT serialnr, publicname, internalname, aeskey '.
			 'FROM yubikeys '.
			 'ORDER BY serialnr, publicname')
    or die "Couldn't prepare statement: " . $dbh->errstr;
$sth->execute()
    or die "Couldn't execute statement: " . $sth->errstr;

my $sha1 = Digest::SHA->new(1);

my $row;
while ($row = $sth->fetchrow_hashref()) {
    if ($verbose) {
	print "# serialnr=" . $row->{'serialnr'} .
	    " publicname=" . $row->{'publicname'} . "\n";
    }
    $sha1->add($row->{'serialnr'});
    $sha1->add($row->{'publicname'});
    $sha1->add($row->{'internalname'});
    $sha1->add($row->{'aeskey'});
}

if ($sth->rows == 0) {
    print "No data?!\n\n";
    exit 1;
}

print substr ($sha1->hexdigest, 0, 10) . "\n";

$sth->finish;
$dbh->disconnect();

exit 0;