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tryton_crypto.patch
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File tryton_crypto.patch of Package tryton.10296
diff -U 6 -H -d -r -N -- a/tryton/plugins/crypto/__init__.py b/tryton/plugins/crypto/__init__.py --- a/tryton/plugins/crypto/__init__.py 1970-01-01 01:00:00.000000000 +0100 +++ b/tryton/plugins/crypto/__init__.py 2014-07-15 10:33:53.000000000 +0200 @@ -0,0 +1,179 @@ +# -*- coding: utf-8 -*- +############################################################################## +# +# GNU Health: The Free Health and Hospital Information System +# Copyright (C) 2008-2014 Luis Falcon <lfalcon@gnusolidario.org> +# Copyright (C) 2011-2014 GNU Solidario <health@gnusolidario.org> +# +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# 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 the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +# +############################################################################## + +import tryton.rpc as rpc +from tryton.common import RPCExecute, warning, message +from tryton.gui.window.form import Form +import gettext + +try: + import gnupg +except: + warning( + ('Document Encryption / Signing disabled' + '\nPlease install the gnupg library '), + ('No GNU Privacy Guard library found !'), + ) + + +_ = gettext.gettext + +def sign_document(data): + """ Retrieve the hash value of the serialized document and + generates a clearsign signature using the user's private key + on the client side via GNU Privacy Guard - GPG -""" + + gpg = gnupg.GPG() + + document_model = data['model'] + + """ Don't allow signing more than one document at a time + To avoid signing unwanted / unread documents + """ + + if (len(data['ids']) > 1): + warning( + _('For security reasons, Please sign one document at a time'), + _('Multiple records selected !'), + ) + return + + """ Verify that the document handles digital signatures """ + + try: + record_vals = rpc.execute( + 'model', document_model, 'read', + data['ids'], + ['document_digest', 'digital_signature'], rpc.CONTEXT) + + except: + warning( + _('Please enable the model for digital signature'), + _('No Digest or Digital Signature fields found !'), + ) + return + + digest = record_vals[0]['document_digest'] + + """ Check that the document hasn't been signed already """ + + if record_vals[0]['digital_signature']: + warning( + _('Document already signed'), + _('This record has been already signed'), + ) + return + + try: + gpg_signature = gpg.sign(digest, clearsign=True) + + except: + warning( + _('Error when signing the document'), + _('Please check your encryption settings'), + ) + + """ + Set the clearsigned digest + """ + try: + RPCExecute( + 'model', document_model, 'set_signature', + data, str(gpg_signature)) + + except: + warning( + _('Error when saving the digital signature'), + _('The signature was generated but NOT saved !'), + ) + + else: + message(_('Document digitally signed')) + + # TODO + # Reload the record view after storing the digital signature + # sig_reload or other method to check. + # a = Form(document_model, data['ids']) + # a.sig_reload() + # a.message_info(_('Document digitally signed'), color='blue') + + +def verify_document(data): + """ Verify the digital signature of the document """ + + gpg = gnupg.GPG() + + document_model = data['model'] + + """ Verify that the document handles digital signatures """ + + try: + record_vals = rpc.execute( + 'model', document_model, 'read', + data['ids'], + ['document_digest', 'digital_signature'], rpc.CONTEXT) + + except: + warning( + _('Please enable the model for digital signature'), + _('No Digest or Digital Signature fields found !'), + ) + return + + + """ Verify signature """ + digital_signature = record_vals[0]['digital_signature'] + + """ Check that the document has been signed """ + if not digital_signature: + warning( + _('Unsigned document'), + _('This document has not been signed yet'), + ) + return + + try: + verify_signature = gpg.verify(digital_signature) + + except: + warning( + _('Error when verifying Digital Signature'), + _('Please check your GNU Privacy Guard Settings'), + ) + + else: + """ Show message of warning boxes depending on the verification """ + if (verify_signature.valid): + message(_("Valid Signature !\n\n" + verify_signature.stderr)) + else: + warning( + _(str(verify_signature.stderr)), + _(str("Error !")), + ) + + +def get_plugins(model): + return [ + (_('Digitally Sign Document'), sign_document), + (_('Verify Digital Signature'), verify_document), + ] diff -U 6 -H -d -r -N -- a/tryton/plugins/crypto/doc/index.rst b/tryton/plugins/crypto/doc/index.rst --- a/tryton/plugins/crypto/doc/index.rst 1970-01-01 01:00:00.000000000 +0100 +++ b/tryton/plugins/crypto/doc/index.rst 2014-07-15 10:33:53.000000000 +0200 @@ -0,0 +1,33 @@ +Tryton Crytpo Plugin +#################### + +This plugin has been developed as part of GNU Health [1], but you should +be able to use it with any model in Tryton[2] + +Functionality : +The Tryton crypto plugin interacts with GNU Privacy Guard [3] to digitally +sign and encrypt documents. + +OS Requirements: + +Model attributes : +The plugin requires - as a minimum - the following attributes on the model +in order to be able to sign the document. + + "document_digest" of type fields.Char + "digital_signature" of type fields.Text + + +In real life, you will need others to make it meaningful. Please take a look +at the Prescription model on the health_crypto module for an example and +other fields used. + + + +Usage: + +References: + +1.- GNU Health : http://health.gnu.org +2.- Tryton : http://www.tryton.org +3.- GNU Privacy Guard : http://www.gnupg.org
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