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# https://github.com/duosecurity/duo_perl
#
# Copyright (c) 2012, Duo Security, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. 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.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
package Bugzilla::DuoWeb;
use 5.10.1;
use strict;
use warnings;
use MIME::Base64;
use Digest::HMAC_SHA1 qw(hmac_sha1_hex);
my $DUO_PREFIX = 'TX';
my $APP_PREFIX = 'APP';
my $AUTH_PREFIX = 'AUTH';
my $DUO_EXPIRE = 300;
my $APP_EXPIRE = 3600;
my $IKEY_LEN = 20;
my $SKEY_LEN = 40;
my $AKEY_LEN = 40;
our $ERR_USER = 'ERR|The username passed to sign_request() is invalid.';
our $ERR_IKEY = 'ERR|The Duo integration key passed to sign_request() is invalid.';
our $ERR_SKEY = 'ERR|The Duo secret key passed to sign_request() is invalid.';
our $ERR_AKEY = "ERR|The application secret key passed to sign_request() must be at least $AKEY_LEN characters.";
our $ERR_UNKNOWN = 'ERR|An unknown error has occurred.';
sub _sign_vals {
my ($key, $vals, $prefix, $expire) = @_;
my $exp = time + $expire;
my $val = join '|', @{$vals}, $exp;
my $b64 = encode_base64($val, '');
my $cookie = "$prefix|$b64";
my $sig = hmac_sha1_hex($cookie, $key);
return "$cookie|$sig";
}
sub _parse_vals {
my ($key, $val, $prefix, $ikey) = @_;
my $ts = time;
if (not defined $val) {
return '';
}
my @parts = split /\|/, $val;
if (scalar(@parts) != 3) {
return '';
}
my ($u_prefix, $u_b64, $u_sig) = @parts;
my $sig = hmac_sha1_hex("$u_prefix|$u_b64", $key);
if (hmac_sha1_hex($sig, $key) ne hmac_sha1_hex($u_sig, $key)) {
return '';
}
if ($u_prefix ne $prefix) {
return '';
}
my @cookie_parts = split /\|/, decode_base64($u_b64);
if (scalar(@cookie_parts) != 3) {
return '';
}
my ($user, $u_ikey, $exp) = @cookie_parts;
if ($u_ikey ne $ikey) {
return '';
}
if ($ts >= $exp) {
return '';
}
return $user;
}
=pod
Generate a signed request for Duo authentication.
The returned value should be passed into the Duo.init() call!
in the rendered web page used for Duo authentication.
Arguments:
ikey -- Duo integration key
skey -- Duo secret key
akey -- Application secret key
username -- Primary-authenticated username
=cut
sub sign_request {
my ($ikey, $skey, $akey, $username) = @_;
if (not $username) {
return $ERR_USER;
}
if (index($username, '|') != -1) {
return $ERR_USER;
}
if (not $ikey or length $ikey != $IKEY_LEN) {
return $ERR_IKEY;
}
if (not $skey or length $skey != $SKEY_LEN) {
return $ERR_SKEY;
}
if (not $akey or length $akey < $AKEY_LEN) {
return $ERR_AKEY;
}
my $vals = [ $username, $ikey ];
my $duo_sig = _sign_vals($skey, $vals, $DUO_PREFIX, $DUO_EXPIRE);
my $app_sig = _sign_vals($akey, $vals, $APP_PREFIX, $APP_EXPIRE);
if (not $duo_sig or not $app_sig) {
return $ERR_UNKNOWN;
}
return "$duo_sig:$app_sig";
}
=pod
Validate the signed response returned from Duo.
Returns the username of the authenticated user, or '' (empty
string) if secondary authentication was denied.
Arguments:
ikey -- Duo integration key
skey -- Duo secret key
akey -- Application secret key
sig_response -- The signed response POST'ed to the server
=cut
sub verify_response {
my ($ikey, $skey, $akey, $sig_response) = @_;
if (not defined $sig_response) {
return '';
}
my ($auth_sig, $app_sig) = split /:/, $sig_response;
my $auth_user = _parse_vals($skey, $auth_sig, $AUTH_PREFIX, $ikey);
my $app_user = _parse_vals($akey, $app_sig, $APP_PREFIX, $ikey);
if ($auth_user ne $app_user) {
return '';
}
return $auth_user;
}
1;
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