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spid_saml_metadata.py
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# -*- coding: utf-8 -*-
# 2021 Alessio Gerace.
#
# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).
from onelogin.saml2.metadata import OneLogin_Saml2_Metadata
from time import gmtime, strftime, time
from datetime import datetime
from onelogin.saml2 import compat
from spid_saml_template import *
import re
import uuid
try:
import ujson as json
except ImportError:
import json
basestring = str
url_regex = re.compile(
r'^(?:[a-z0-9\.\-]*)://' # scheme is validated separately
r'(?:(?:[A-Z0-9_](?:[A-Z0-9-_]{0,61}[A-Z0-9_])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' # domain...
r'localhost|' # localhost...
r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|' # ...or ipv4
r'\[?[A-F0-9]*:[A-F0-9:]+\]?)' # ...or ipv6
r'(?::\d+)?' # optional port
r'(?:/?|[/?]\S+)$', re.IGNORECASE)
url_schemes = ['http', 'https', 'ftp', 'ftps']
def validate_url(url):
"""
Auxiliary method to validate an urllib
:param url: An url to be validated
:type url: string
:returns: True if the url is valid
:rtype: bool
"""
scheme = url.split('://')[0].lower()
if scheme not in url_schemes:
return False
if not bool(url_regex.search(url)):
return False
return True
class SpidOneLogin_Saml2_Metadata(OneLogin_Saml2_Metadata):
"""
A class that contains methods related to the metadata of the SP
"""
TIME_VALID = 172800 # 2 days
TIME_CACHED = 604800 # 1 week
@staticmethod
def builder(sp, authnsign=False, wsign=False, valid_until=None, cache_duration=None, contacts=None,
organization=None):
"""
Builds the metadata of the SP
:param sp: The SP data
:type sp: string
:param authnsign: authnRequestsSigned attribute
:type authnsign: string
:param wsign: wantAssertionsSigned attribute
:type wsign: string
:param valid_until: Metadata's expiry date
:type valid_until: string|DateTime|Timestamp
:param cache_duration: Duration of the cache in seconds
:type cache_duration: int|string
:param contacts: Contacts info
:type contacts: dict
:param organization: Organization info
:type organization: dict
"""
if valid_until is None:
valid_until = int(time()) + SpidOneLogin_Saml2_Metadata.TIME_VALID
if not isinstance(valid_until, basestring):
if isinstance(valid_until, datetime):
valid_until_time = valid_until.timetuple()
else:
valid_until_time = gmtime(valid_until)
valid_until_str = strftime(r'%Y-%m-%dT%H:%M:%SZ', valid_until_time)
else:
valid_until_str = valid_until
if cache_duration is None:
cache_duration = SpidOneLogin_Saml2_Metadata.TIME_CACHED
if not isinstance(cache_duration, compat.str_type):
cache_duration_str = 'PT%sS' % cache_duration # Period of Time x Seconds
else:
cache_duration_str = cache_duration
if contacts is None:
contacts = {}
if organization is None:
organization = {}
sls = ''
if 'singleLogoutService' in sp and 'url' in sp['singleLogoutService']:
sls = OneLogin_Saml2_Templates.MD_SLS % \
{
'binding': sp['singleLogoutService']['binding'],
'location': sp['singleLogoutService']['url'],
'resplocation': sp['singleLogoutService']['respurl'],
}
str_authnsign = 'true' if authnsign else 'false'
str_wsign = 'true' if wsign else 'false'
str_organization = ''
if len(organization) > 0:
organization_names = []
organization_displaynames = []
organization_urls = []
for (lang, info) in organization.items():
organization_names.append(
""" <md:OrganizationName xml:lang="%s">%s</md:OrganizationName>""" % (lang, info['name']))
organization_displaynames.append(
""" <md:OrganizationDisplayName xml:lang="%s">%s</md:OrganizationDisplayName>""" % (
lang, info['displayname']))
organization_urls.append(
""" <md:OrganizationURL xml:lang="%s">%s</md:OrganizationURL>""" % (lang, info['url']))
org_data = '\n'.join(organization_names) + '\n' + '\n'.join(organization_displaynames) + '\n' + '\n'.join(
organization_urls)
str_organization = """ <md:Organization>\n%(org)s\n </md:Organization>""" % {'org': org_data}
str_contacts = ''
if len(contacts) > 0:
contacts_info = []
for (ctype, info) in contacts.items():
datadict = info
datadict.update(info.get('Extensions'))
datadict.pop('Extensions')
if ctype == "other":
info['ctype'] = ctype
if datadict.get('IPACode'):
ipacode = f"<spid:IPACode>{datadict['IPACode']}</spid:IPACode>"
datadict['IPACode'] = ipacode
info['Exttype'] = "Public"
datadict['VATNumber'] = ""
datadict['FiscalCode'] = ""
elif datadict.get('VATNumber') or info.get('FiscalCode'):
VATNumber = f" <spid:VATNumber>{datadict['VATNumber']}/spid:VATNumber>"
FiscalCode = f" <spid:FiscalCode>{datadict['FiscalCode']}</spid:FiscalCode>"
datadict['VATNumber'] = VATNumber
datadict['FiscalCode'] = FiscalCode
datadict['Exttype'] = "Private"
contact = OneLogin_Saml2_Templates.MD_CONTACT_PERSON % datadict
contacts_info.append(contact)
if ctype == "billing":
pass
str_contacts = '\n'.join(contacts_info)
str_attribute_consuming_service = ''
if 'attributeConsumingService' in sp and len(sp['attributeConsumingService']):
attr_cs_desc_str = ''
if "serviceDescription" in sp['attributeConsumingService']:
attr_cs_desc_str = """ <md:ServiceDescription xml:lang="it">%s</md:ServiceDescription>
""" % sp['attributeConsumingService']['serviceDescription']
requested_attribute_data = []
for req_attribs in sp['attributeConsumingService']['requestedAttributes']:
req_attr_nameformat_str = req_attr_friendlyname_str = req_attr_isrequired_str = ''
req_attr_aux_str = ' />'
if 'nameFormat' in req_attribs.keys() and req_attribs['nameFormat']:
req_attr_nameformat_str = " NameFormat=\"%s\"" % req_attribs['nameFormat']
if 'friendlyName' in req_attribs.keys() and req_attribs['friendlyName']:
req_attr_friendlyname_str = " FriendlyName=\"%s\"" % req_attribs['friendlyName']
if 'isRequired' in req_attribs.keys() and req_attribs['isRequired']:
req_attr_isrequired_str = " isRequired=\"%s\"" % 'true' if req_attribs['isRequired'] else 'false'
if 'attributeValue' in req_attribs.keys() and req_attribs['attributeValue']:
if isinstance(req_attribs['attributeValue'], basestring):
req_attribs['attributeValue'] = [req_attribs['attributeValue']]
req_attr_aux_str = ">"
for attrValue in req_attribs['attributeValue']:
req_attr_aux_str += """
<saml:AttributeValue xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">%(attributeValue)s</saml:AttributeValue>""" % \
{
'attributeValue': attrValue
}
req_attr_aux_str += """
</md:RequestedAttribute>"""
requested_attribute = """ <md:RequestedAttribute Name="%(req_attr_name)s"%(req_attr_nameformat_str)s%(req_attr_friendlyname_str)s%(req_attr_isrequired_str)s%(req_attr_aux_str)s""" % \
{
'req_attr_name': req_attribs['name'],
'req_attr_nameformat_str': req_attr_nameformat_str,
'req_attr_friendlyname_str': req_attr_friendlyname_str,
'req_attr_isrequired_str': req_attr_isrequired_str,
'req_attr_aux_str': req_attr_aux_str
}
requested_attribute_data.append(requested_attribute)
str_attribute_consuming_service = """ <md:AttributeConsumingService index="0">
<md:ServiceName xml:lang="it">%(service_name)s</md:ServiceName>
%(attr_cs_desc)s%(requested_attribute_str)s
</md:AttributeConsumingService>
""" % \
{
'service_name': sp['attributeConsumingService']['serviceName'],
'attr_cs_desc': attr_cs_desc_str,
'requested_attribute_str': '\n'.join(requested_attribute_data)
}
metadata = OneLogin_Saml2_Templates.MD_ENTITY_DESCRIPTOR % \
{
'valid': ('validUntil="%s"' % valid_until_str) if valid_until_str else '',
"uuid": str(uuid.uuid4()),
'cache': ('cacheDuration="%s"' % cache_duration_str) if cache_duration_str else '',
'entity_id': sp['entityId'],
'authnsign': str_authnsign,
'wsign': str_wsign,
'name_id_format': sp['NameIDFormat'],
'binding': sp['assertionConsumerService']['binding'],
'location': sp['assertionConsumerService']['url'],
'sls': sls,
'organization': str_organization,
'contacts': str_contacts,
'attribute_consuming_service': str_attribute_consuming_service
}
return metadata