NAME

Crypt::License - Perl extension to examine a license file.

USEAGE

There are two modes of operation:

use Crypt::License;1;
__END__
encrypted module here...

The calling routine should define an anonymous hash pointed to by the variable $ptr2_License. i.e.

 use vars qw( $ptr2_License );
 $ptr2_License = {
	'private'	=> 'name1, name2,...',	# use private key 
						# module name
	'path'		=> 'path to License file',
 };
 require licensed_module_name;

Or, for nested modules, a reference pointer to point back to the originating module containing the License information.

 use vars qw( $ptr2_License );
 $ptr2_License = { 'next' => 'any value will do', };
 require licensed_module_name;

	Seconds remaining until License expiration are returned in
	$ptr2_License{expires} unless there is no expiration

	Warnings if any will be in $ptr2_License->{warn}

	It is important the 'require' instead of 'use' loads the module
	so that $ptr2_License is visible to the loader and not forgotton
	in the case of mod-perl so don't enclose a in BEGIN{} block.

	Version checking is not supported via 'use' like statement. It
	can be done by examining the module contents.

More automated setup can be accomplished with the Crypt::License::Util tools.

use Crypt::License::Util;

See Crypt::License::Util documentation for complete description

The second module mode is for development use and just loads the module so its objects can be accessed;

use Crypt::License;

$time = Crypt::License::date2time(date string);

@file_text = Crypt::License::get_file(file_path);

$first_tag_number = Crypt::License::extract(\@file_text,\%parms);

Crypt::License::get_vals(\%parms);

DESCRIPTION

Crypt::License decodes an encrypted file and attempts to decrypt it by first, looking for a hash pointer in the caller program called $ptr2_License. The hash contains the path to the License file and an optional 'private' key list of modules which will decrypt only with the 'private' key. OR, a hash key of 'next' with no particular value that indicates to look to the next caller on the stack for the License pointer. If the pointer is not present or the License file is not found successfully, then no further action is taken. If the License file is successfully opened, and the contents validated then the attached encrypted module is loaded and the seconds remaining until License expiration are returned or now() in the case of no expiration. Undef is returned for an expired license (module fails to load).

This is what is in a certificate

License Text followed by:
 
ID:	:unique licensee identifier, date code is fine
NAME:	:company or entity name
ADD1:	:address line 1
ADD2:	:address line 2
CITY:	:city
STATE:	:state or province
ZIP:	:postal code
CTRY:	:country
TEL:	:telephone number
FAX: 	fax number
CONT:	:contact person
MAIL:	:email addy of contact
----------------------------------
SERV:	:http server name	* optional
HOST:	:hostname		* optional Sys::Hostname
USER:	:calling user		* optional
GROUP:	:calling group		* optional
HOME:	:called from within this path	* optional
----------------------------------
DATE:	:creation date, mm-dd-yy | yyyy  or mmm dd yy | yyyy
EXP:	:expiration		* optional
KEY:	:hex key
PKEY:	:hex public key
----------------------------------

$time = Crypt::License::date2time(date string)

Converts a string into a numeric time value as returned by the perl function 'time' else 0;

 * acceptable date formats
	mm/dd/yy
	mm-dd-yy
	mm dd yy
	month day year		month = text or digits
	month day, year

actually any combination of separators [/- ] will work commas are always deleted, white space compressed, etc...

@file_text = Crypt::License::get_file(file_path)

Takes the file path/name as its argument. Returns the stripped file contents suitable for MAC calculation in an array. On failure, returns an empty array.

MAC calculation

The MAC signature is created by taking the MD5 sum of the file less MAC the line (if present). Leading blank lines are removed, all tabs are converted to single spaces and trailing white space is snipped to avoid complications caused by cut and paste operations. MAC calculation is only done on the text portion of the file.

$first_tag_num = Crypt::License::extract(\@file_text,\%parms)

extract takes an input array consisting of the lines of text in the License and returns the \%parms hash filled with the values present in the License file. The return value is the pointer to the first tag of the array.

MAC calculation described above will only be done on the text portion of the array.

Crypt::License::get_vals(\%parms,\%chk_vals)

The following fields are returned to the %chk_vals hash from the host platform unless the fields are not present in the License file:

SERV:	:http server name
HOST:	:hostname as returned by Sys::Hostname::hostname
USER:	:user
GROUP:	:user
HOME:	:server document root
EXP:	:time since epcoch time ins seconds

TARGET MODULE PREPARATION

The target module distribution for License encryption should be modified as follows:

Copy makePOD.pl, makeCrypt.pl, mod_parser.pl, and TestCert.license from the License distribution to the target distribution and include in the target distribution MANIFEST.
Modify the t/test.t and/or test.pl scripts to include a $ptr2_License hash.
Rename the target distribution XXXXX.pm file to XXXXX.PM and separate the pod documentation into a separate file.
```
makePOD.pl XXXXX.PM
	will create XXXXX.pod, XXXXX.PM.nopod
```

Modify the Makefile.PL file as follows to include 'make crypt' and 'make cryptdist' functions.

 use ExtUtils::MakeMaker;
 # See lib/ExtUtils/MakeMaker.pm for details of how to influence
 # the contents of the Makefile that is written.

 my $name	= 'Foo::ModuleName';
 @_		= split('::',$name);
 my $src	= $_[$#_] . '.PM';
 my $target	= $_[$#_] . '.pm';
 my $pod	= $name . '.3';

 sub MY::top_targets {
   package MY;   # add dependencies for .pm and xs files
 ####>>> TABS required below, not spaces !!!
   my $inherited = "
 $target : $src
	/bin/cp -p $src $target
 " . shift->SUPER::top_targets(@_) . "
 crypt :: 
	./makeCrypt.pl $src $name " . q|$(INST_LIB)

cryptdist : $(DISTVNAME).bin.tar$(SUFFIX)

$(DISTVNAME).bin.tar$(SUFFIX) :: all crypt $(RM_RF) $(DISTVNAME).bin find blib -type f > delete.me~ echo -e "Makefile\nMakefile.PL" >>delete.me~ CRYPTIME=$(/bin/date +%Y%m%d%H%M.%S) $(PERL) -I$(PERL_ARCHLIB) -I$(PERL_LIB) -MExtUtils::Manifest=manicopy,maniread \ -e "manicopy(maniread('delete.me~'),'$(DISTVNAME).bin', '$(DIST_CP)');" cp | . $target . q| $(DISTVNAME).bin/| . $src . q| cp | . $target . q| $(DISTVNAME).bin/| . $target . q| touch +$(CRYPTIME) $(DISTVNAME).bin/| . $src . q| touch +$(CRYPTIME) $(DISTVNAME).bin/| . $target . q| $(TAR) $(TARFLAGS) $(DISTVNAME).bin.tar $(DISTVNAME).bin $(COMPRESS) $(DISTVNAME).bin.tar $(RM_RF) $(DISTVNAME).bin |; }

WriteMakefile(
   'NAME'         => $name,
   'VERSION_FROM' => $src,          # finds $VERSION
   'PREREQ_PM'    => {},            # e.g., Module::Name => 1.1
   'PM'           => {$target  => '$(INST_LIBDIR)/'.$target},
   'MAN3PODS'     => {$pod     => {$pod => '$(INST_MAN3DIR)/'.$pod},
   'pm_to_blib'   => {$target  => '$(INST_LIBDIR)/'.$target},
   'clean'        => {FILES    => $target},
   'dist'         => {COMPRESS => 'gzip', SUFFIX=>'gz'}
);

# NOTE: remove the MAN3PODS section if not applicable

Make the module as follows:

For the development environment.

perl Makefile.PL
make
make test
make crypt
make test --- again to verify it works crypted
make install
make dist
make cryptdist

For the client environment:

tar -xzvf FOO-Whatever.bin.tar.gz
cd FOO-Whatever.bin
make install

HINTS

For installation with programs called by apache that are installed using PerlModule or PerlRequire commands, there are several requirements.

1 The server will need a License with a public key. The License needs to be loaded in the startup.pl script.

2 The handlers loaded from the PerlRequire or PerlModule directives need a next $ptr2_License so that on startup they will decrypt and when called from user space will point back to the user License.

3 Any routine which calls handler directives needs a next $ptr2_License even if the module is not actually loaded in the routine. i.e. some handlers, like Apache::AuthCookie, force the loading of the user's handlers so the call to 'use UserHandler' is unnecessary.

4 Specifically for modules like Apache::AuthCookie, this module calls Licensed modules by virtue of the PerlRequire or PerlModule directives in the users config file. BECAUSE of this, the AuthCookie module MUST have a next $ptr2_License inserted in the beginning statements.

HINT use the Crypt::License::Util routines to insert the necessary pointer after a standard module is "used" but before the code is called.

i.e.
use Apache;
use Apache::Constants qw(:common :response :http);
use Apache::AuthCookie;
use vars qw($VERSION @ISA);
$VERSION = 1.00;
@ISA = qw(Apache::AuthCookie);
use Crypt::License::Util;
exportNext2('Apache::AuthCookie');

5 With all this accomplished, crypted modules should load and de-crypt without problem.

EXPORT

None by default.

TOOLS

makeCert.pl	  makes a License document
makeLicenseMod.pl	makes only unsplit Licensed modules
makeCrypt.pl	  makes a split Licensed module
makePOD.pl	  separates POD from mixed module
mod_parser.pl	  used by makeCrypt, makePOD, makeLicenseMod

AUTHOR

Michael Robinton, michael@bizsystems.com

COPYRIGHT

COPYRIGHT and LICENSE

Copyright 2002 Michael Robinton, BizSystems.

This module is free software; you can redistribute it and/or modify it under the terms of either:

a) the GNU General Public License as published by the Free Software
Foundation; either version 1, or (at your option) any later version,

or

b) the "Artistic License" which comes with this module.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the GNU General Public License or the Artistic License for more details.

You should have received a copy of the Artistic License with this module, in the file ARTISTIC. If not, I'll be glad to provide one.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

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