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Current File : /usr/lib/python3/dist-packages/pysimplesoap/wsse.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 3, 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.

"""Pythonic simple SOAP Client plugins for WebService Security extensions"""


from __future__ import unicode_literals
import sys
if sys.version > '3':
    basestring = unicode = str

import datetime
from decimal import Decimal
import os
import logging
import hashlib
import warnings

from . import __author__, __copyright__, __license__, __version__
from .simplexml import SimpleXMLElement

import random
import string
from hashlib import sha1

def randombytes(N):
    return ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N))

# Namespaces:

WSSE_URI = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'
WSU_URI = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
XMLDSIG_URI = "http://www.w3.org/2000/09/xmldsig#"
X509v3_URI = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"
Base64Binary_URI = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary"
PasswordDigest_URI = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordDigest"


class UsernameToken:
    "WebService Security extension to add a basic credentials to xml request"

    def __init__(self, username="", password=""):
        self.token = {
            'wsse:UsernameToken': {
                'wsse:Username': username,
                'wsse:Password': password,
                }
            }

    def preprocess(self, client, request, method, args, kwargs, headers, soap_uri):
        "Add basic credentials to outgoing message"
        # always extract WS Security header and send it
        header = request('Header', ns=soap_uri, )
        k = 'wsse:Security'
        # for backward compatibility, use header if given:
        if k in headers:
            self.token = headers[k]
        # convert the token to xml
        header.marshall(k, self.token, ns=False, add_children_ns=False)
        header(k)['xmlns:wsse'] = WSSE_URI
        #<wsse:UsernameToken xmlns:wsu='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'>

    def postprocess(self, client, response, method, args, kwargs, headers, soap_uri):
        "Analyze incoming credentials"
        # TODO: add some password validation callback?
        pass

class UsernameDigestToken(UsernameToken):
    """
    WebService Security extension to add a http digest credentials to xml request
    drift -> time difference from the server in seconds, needed for 'Created' header
    """

    def __init__(self, username="", password="", drift=0):
        self.username = username
        self.password = password
        self.drift = datetime.timedelta(seconds=drift)

    def preprocess(self, client, request, method, args, kwargs, headers, soap_uri):
        header = request('Header', ns=soap_uri, )
        wsse = header.add_child('wsse:Security', ns=False)
        wsse['xmlns:wsse'] = WSSE_URI
        wsse['xmlns:wsu'] = WSU_URI

        usertoken = wsse.add_child('wsse:UsernameToken', ns=False)
        usertoken.add_child('wsse:Username', self.username, ns=False)

        created = (datetime.datetime.utcnow() + self.drift).isoformat() + 'Z'
        usertoken.add_child('wsu:Created', created, ns=False)

        nonce = randombytes(16)
        wssenonce = usertoken.add_child('wsse:Nonce', nonce.encode('base64')[:-1], ns=False)
        wssenonce['EncodingType'] = Base64Binary_URI

        sha1obj = sha1()
        sha1obj.update(nonce + created + self.password)
        digest = sha1obj.digest()
        password = usertoken.add_child('wsse:Password', digest.encode('base64')[:-1], ns=False)
        password['Type'] = PasswordDigest_URI


BIN_TOKEN_TMPL = """<?xml version="1.0" encoding="UTF-8"?>
<wsse:Security soapenv:mustUnderstand="1" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
    <wsse:BinarySecurityToken EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" wsu:Id="CertId-45851B081998E431E8132880700036719" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
%(certificate)s</wsse:BinarySecurityToken>
    <ds:Signature Id="Signature-13" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
        %(signed_info)s
        <ds:SignatureValue>%(signature_value)s</ds:SignatureValue>
        <ds:KeyInfo Id="KeyId-45851B081998E431E8132880700036720">
            <wsse:SecurityTokenReference wsu:Id="STRId-45851B081998E431E8132880700036821" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
                <wsse:Reference URI="#CertId-45851B081998E431E8132880700036719" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/>
            </wsse:SecurityTokenReference>
        </ds:KeyInfo>
    </ds:Signature>
</wsse:Security>
"""

class BinaryTokenSignature:
    "WebService Security extension to add a basic signature to xml request"

    def __init__(self, certificate="", private_key="", password=None, cacert=None):
        # read the X509v3 certificate (PEM)
        self.certificate = ''.join([line for line in open(certificate)
                                         if not line.startswith("---")])
        self.private_key = private_key
        self.password = password
        self.cacert = cacert

    def preprocess(self, client, request, method, args, kwargs, headers, soap_uri):
        "Sign the outgoing SOAP request"
        # get xml elements:
        body = request('Body', ns=soap_uri, )
        header = request('Header', ns=soap_uri, )
        # prepare body xml attributes to be signed (reference)
        body['wsu:Id'] = "id-14"
        body['xmlns:wsu'] = WSU_URI
        # workaround: copy namespaces so lxml can parse the xml to be signed
        for attr, value in request[:]:
            if attr.startswith("xmlns"):
                body[attr] = value
        # use the internal tag xml representation (not the full xml document)
        ref_xml = repr(body)
        # sign using RSA-SHA1 (XML Security)
        from . import xmlsec
        vars = xmlsec.rsa_sign(ref_xml, "#id-14", 
                               self.private_key, self.password)
        vars['certificate'] = self.certificate
        # generate the xml (filling the placeholders)
        wsse = SimpleXMLElement(BIN_TOKEN_TMPL % vars)
        header.import_node(wsse)

    def postprocess(self, client, response, method, args, kwargs, headers, soap_uri):
        "Verify the signature of the incoming response"
        from . import xmlsec
        # get xml elements:
        body = response('Body', ns=soap_uri, )
        header = response('Header', ns=soap_uri, )
        wsse = header("Security", ns=WSSE_URI)
        cert = wsse("BinarySecurityToken", ns=WSSE_URI)
        # check that the cert (binary token) is coming in the correct format:
        self.__check(cert["EncodingType"], Base64Binary_URI)
        self.__check(cert["ValueType"], X509v3_URI)
        # extract the certificate (in DER to avoid new line & padding issues!)
        cert_der = str(cert).decode("base64")
        public_key = xmlsec.x509_extract_rsa_public_key(cert_der, binary=True)
        # validate the certificate using the certification authority:
        if not self.cacert:
            warnings.warn("No CA provided, WSSE not validating certificate")
        elif not xmlsec.x509_verify(self.cacert, cert_der, binary=True):
            raise RuntimeError("WSSE certificate validation failed")
        # check body xml attributes was signed correctly (reference)
        self.__check(body['xmlns:wsu'], WSU_URI)
        ref_uri = body['wsu:Id']
        signature = wsse("Signature", ns=XMLDSIG_URI)
        signed_info = signature("SignedInfo", ns=XMLDSIG_URI)
        signature_value = signature("SignatureValue", ns=XMLDSIG_URI)
        # TODO: these sanity checks should be moved to xmlsec?
        self.__check(signed_info("Reference", ns=XMLDSIG_URI)['URI'], "#" + ref_uri)
        self.__check(signed_info("SignatureMethod", ns=XMLDSIG_URI)['Algorithm'], 
                     XMLDSIG_URI + "rsa-sha1")
        self.__check(signed_info("Reference", ns=XMLDSIG_URI)("DigestMethod", ns=XMLDSIG_URI)['Algorithm'], 
                     XMLDSIG_URI + "sha1")
        # TODO: check KeyInfo uses the correct SecurityTokenReference
        # workaround: copy namespaces so lxml can parse the xml to be signed
        for attr, value in response[:]:
            if attr.startswith("xmlns"):
                body[attr] = value
        # use the internal tag xml representation (not the full xml document)
        ref_xml = xmlsec.canonicalize(repr(body))
        # verify the signed hash
        computed_hash =  xmlsec.sha1_hash_digest(ref_xml)
        digest_value = str(signed_info("Reference", ns=XMLDSIG_URI)("DigestValue", ns=XMLDSIG_URI))
        if computed_hash != digest_value:
            raise RuntimeError("WSSE SHA1 hash digests mismatch")
        # workaround: prepare the signed info (assure the parent ns is present)
        signed_info['xmlns'] = XMLDSIG_URI
        xml = repr(signed_info)
        # verify the signature using RSA-SHA1 (XML Security)
        ok = xmlsec.rsa_verify(xml, str(signature_value), public_key)
        if not ok:
            raise RuntimeError("WSSE RSA-SHA1 signature verification failed")
        # TODO: remove any unsigned part from the xml?
        
    def __check(self, value, expected, msg="WSSE sanity check failed"):
        if value != expected:
            raise RuntimeError(msg)

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