def get_status(dom):
"""
Gets Status from a Response, include RealMe inner subcode.
:param dom: The Response as XML
:type: Document
:returns: The Status, an array with code, subcode and a message.
:rtype: dict
"""
status = {}
status_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status')
if len(status_entry) != 1:
raise Exception('Missing valid Status on response')
code_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode', status_entry[0])
if len(code_entry) != 1:
raise Exception('Missing valid Status Code on response')
code = code_entry[0].values()[0]
status['code'] = code
subcode_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode/samlp:StatusCode', status_entry[0])
if len(subcode_entry) == 1:
status['subcode'] = subcode_entry[0].values()[0]
status['msg'] = ''
message_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusMessage', status_entry[0])
if len(message_entry) == 1:
status['msg'] = message_entry[0].text
return status
def get_status(dom):
"""
Gets Status from a Response.
:param dom: The Response as XML
:type: Document
:returns: The Status, an array with the code and a message.
:rtype: dict
"""
status = {}
status_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status')
if len(status_entry) != 1:
raise Exception('Missing valid Status on response')
code_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode', status_entry[0])
if len(code_entry) != 1:
raise Exception('Missing valid Status Code on response')
code = code_entry[0].values()[0]
status['code'] = code
status['msg'] = ''
message_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusMessage', status_entry[0])
if len(message_entry) == 0:
subcode_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode/samlp:StatusCode', status_entry[0])
if len(subcode_entry) == 1:
status['msg'] = subcode_entry[0].values()[0]
elif len(message_entry) == 1:
status['msg'] = message_entry[0].text
return status
def _parse_metadata_dom(self, metadata_dom):
entity_descriptor_nodes = OneLogin_Saml2_XML.query(
metadata_dom, self.ENTITY_DESCRIPTOR_XPATH)
idps = []
for entity_descriptor_node in entity_descriptor_nodes:
idp_descriptor_nodes = OneLogin_Saml2_XML.query(
entity_descriptor_node, self.IDP_DESCRIPTOR_XPATH)
for idp_descriptor_node in idp_descriptor_nodes:
idp_entity_id = entity_descriptor_node.get(
self.ENTITY_ID_ATTRIBUTE, None)
display_name_node = OneLogin_Saml2_XML.query(
idp_descriptor_node, self.DISPLAY_NAME_XPATH)
if not display_name_node:
continue
display_name = display_name_node[0].text
idp = IdentityProviderMetadata(idp_entity_id, display_name,
entity_descriptor_node)
idps.append(idp)
return idps
def validate_sign(xml,
cert=None,
fingerprint=None,
fingerprintalg='sha1',
validatecert=False,
debug=False):
"""
Validates a signature (Message or Assertion).
:param xml: The element we should validate
:type: string | Document
:param cert: The pubic cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
signature_nodes = OneLogin_Saml2_XML.query(
elem, '/samlp:Response/ds:Signature')
if not len(signature_nodes) > 0:
signature_nodes += OneLogin_Saml2_XML.query(
elem,
'/samlp:Response/saml:EncryptedAssertion/saml:Assertion/ds:Signature'
)
signature_nodes += OneLogin_Saml2_XML.query(
elem, '/samlp:Response/saml:Assertion/ds:Signature')
if len(signature_nodes) == 1:
signature_node = signature_nodes[0]
return OneLogin_Saml2_Utils.validate_node_sign(
signature_node, elem, cert, fingerprint, fingerprintalg,
validatecert, debug)
else:
return False
except xmlsec.Error as e:
if debug:
print(e)
return False
def validate_node_sign(signature_node, elem, cert=None, fingerprint=None, fingerprintalg='sha1', validatecert=False, debug=False):
"""
Validates a signature node.
:param signature_node: The signature node
:type: Node
:param xml: The element we should validate
:type: Document
:param cert: The public cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if (cert is None or cert == '') and fingerprint:
x509_certificate_nodes = OneLogin_Saml2_XML.query(signature_node, '//ds:Signature/ds:KeyInfo/ds:X509Data/ds:X509Certificate')
if len(x509_certificate_nodes) > 0:
x509_certificate_node = x509_certificate_nodes[0]
x509_cert_value = x509_certificate_node.text
x509_fingerprint_value = OneLogin_Saml2_Utils.calculate_x509_fingerprint(x509_cert_value, fingerprintalg)
if fingerprint == x509_fingerprint_value:
cert = OneLogin_Saml2_Utils.format_cert(x509_cert_value)
if cert is None or cert == '':
return False
# Check if Reference URI is empty
reference_elem = OneLogin_Saml2_XML.query(signature_node, '//ds:Reference')
if len(reference_elem) > 0:
if reference_elem[0].get('URI') == '':
reference_elem[0].set('URI', '#%s' % signature_node.getparent().get('ID'))
if validatecert:
manager = xmlsec.KeysManager()
manager.load_cert_from_memory(cert, xmlsec.KeyFormat.CERT_PEM, xmlsec.KeyDataType.TRUSTED)
dsig_ctx = xmlsec.SignatureContext(manager)
else:
dsig_ctx = xmlsec.SignatureContext()
dsig_ctx.key = xmlsec.Key.from_memory(cert, xmlsec.KeyFormat.CERT_PEM, None)
dsig_ctx.set_enabled_key_data([xmlsec.KeyData.X509])
dsig_ctx.verify(signature_node)
return True
except xmlsec.Error as e:
if debug:
print(e)
def validate_node_sign(signature_node, elem, cert=None, fingerprint=None, fingerprintalg='sha1', validatecert=False, debug=False):
"""
Validates a signature node.
:param signature_node: The signature node
:type: Node
:param xml: The element we should validate
:type: Document
:param cert: The pubic cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if (cert is None or cert == '') and fingerprint:
x509_certificate_nodes = OneLogin_Saml2_XML.query(signature_node, '//ds:Signature/ds:KeyInfo/ds:X509Data/ds:X509Certificate')
if len(x509_certificate_nodes) > 0:
x509_certificate_node = x509_certificate_nodes[0]
x509_cert_value = x509_certificate_node.text
x509_fingerprint_value = OneLogin_Saml2_Utils.calculate_x509_fingerprint(x509_cert_value, fingerprintalg)
if fingerprint == x509_fingerprint_value:
cert = OneLogin_Saml2_Utils.format_cert(x509_cert_value)
if cert is None or cert == '':
return False
# Check if Reference URI is empty
reference_elem = OneLogin_Saml2_XML.query(signature_node, '//ds:Reference')
if len(reference_elem) > 0:
if reference_elem[0].get('URI') == '':
reference_elem[0].set('URI', '#%s' % signature_node.getparent().get('ID'))
if validatecert:
manager = xmlsec.KeysManager()
manager.load_cert_from_memory(cert, xmlsec.KeyFormat.CERT_PEM, xmlsec.KeyDataType.TRUSTED)
dsig_ctx = xmlsec.SignatureContext(manager)
else:
dsig_ctx = xmlsec.SignatureContext()
dsig_ctx.key = xmlsec.Key.from_memory(cert, xmlsec.KeyFormat.CERT_PEM, None)
dsig_ctx.set_enabled_key_data([xmlsec.KeyData.X509])
dsig_ctx.verify(signature_node)
return True
except xmlsec.Error as e:
if debug:
print(e)
def validate_metadata_sign(
xml, cert=None, fingerprint=None, fingerprintalg="sha1", validatecert=False, debug=False
):
"""
Validates a signature of a EntityDescriptor.
:param xml: The element we should validate
:type: string | Document
:param cert: The pubic cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if xml is None or xml == "":
raise Exception("Empty string supplied as input")
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
signature_nodes = OneLogin_Saml2_XML.query(elem, "/md:EntitiesDescriptor/ds:Signature")
if len(signature_nodes) == 0:
signature_nodes += OneLogin_Saml2_XML.query(elem, "/md:EntityDescriptor/ds:Signature")
if len(signature_nodes) == 0:
signature_nodes += OneLogin_Saml2_XML.query(
elem, "/md:EntityDescriptor/md:SPSSODescriptor/ds:Signature"
)
signature_nodes += OneLogin_Saml2_XML.query(
elem, "/md:EntityDescriptor/md:IDPSSODescriptor/ds:Signature"
)
if len(signature_nodes) > 0:
for signature_node in signature_nodes:
if not OneLogin_Saml2_Utils.validate_node_sign(
signature_node, elem, cert, fingerprint, fingerprintalg, validatecert, debug
):
return False
return True
else:
return False
except Exception:
return False
def validate_num_assertions(self):
"""
Verifies that the document only contains a single Assertion (encrypted or not)
:returns: True if only 1 assertion encrypted or not
:rtype: bool
"""
encrypted_assertion_nodes = OneLogin_Saml2_XML.query(self.document, '//saml:EncryptedAssertion')
assertion_nodes = OneLogin_Saml2_XML.query(self.document, '//saml:Assertion')
return (len(encrypted_assertion_nodes) + len(assertion_nodes)) == 1
def __decrypt_assertion(self, xml):
"""
Decrypts the Assertion
:raises: Exception if no private key available
:param xml: Encrypted Assertion
:type xml: Element
:returns: Decrypted Assertion
:rtype: Element
"""
key = self.__settings.get_sp_key()
debug = self.__settings.is_debug_active()
if not key:
raise OneLogin_Saml2_Error(
'No private key available to decrypt the assertion, check settings',
OneLogin_Saml2_Error.PRIVATE_KEY_NOT_FOUND
)
encrypted_assertion_nodes = OneLogin_Saml2_XML.query(xml, '/samlp:Response/saml:EncryptedAssertion')
if encrypted_assertion_nodes:
encrypted_data_nodes = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], '//saml:EncryptedAssertion/xenc:EncryptedData')
if encrypted_data_nodes:
keyinfo = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], '//saml:EncryptedAssertion/xenc:EncryptedData/ds:KeyInfo')
if not keyinfo:
raise OneLogin_Saml2_ValidationError(
'No KeyInfo present, invalid Assertion',
OneLogin_Saml2_ValidationError.KEYINFO_NOT_FOUND_IN_ENCRYPTED_DATA
)
keyinfo = keyinfo[0]
children = keyinfo.getchildren()
if not children:
raise OneLogin_Saml2_ValidationError(
'KeyInfo has no children nodes, invalid Assertion',
OneLogin_Saml2_ValidationError.CHILDREN_NODE_NOT_FOUND_IN_KEYINFO
)
for child in children:
if 'RetrievalMethod' in child.tag:
if child.attrib['Type'] != 'http://www.w3.org/2001/04/xmlenc#EncryptedKey':
raise OneLogin_Saml2_ValidationError(
'Unsupported Retrieval Method found',
OneLogin_Saml2_ValidationError.UNSUPPORTED_RETRIEVAL_METHOD
)
uri = child.attrib['URI']
if not uri.startswith('#'):
break
uri = uri.split('#')[1]
encrypted_key = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], './xenc:EncryptedKey[@Id="' + uri + '"]')
if encrypted_key:
keyinfo.append(encrypted_key[0])
encrypted_data = encrypted_data_nodes[0]
decrypted = OneLogin_Saml2_Utils.decrypt_element(encrypted_data, key, debug)
xml.replace(encrypted_assertion_nodes[0], decrypted)
return xml
def __decrypt_assertion(self, xml):
"""
Decrypts the Assertion
:raises: Exception if no private key available
:param xml: Encrypted Assertion
:type xml: Element
:returns: Decrypted Assertion
:rtype: Element
"""
key = self.__settings.get_sp_key()
debug = self.__settings.is_debug_active()
if not key:
raise Exception('No private key available, check settings')
encrypted_assertion_nodes = OneLogin_Saml2_XML.query(
xml, '/samlp:Response/saml:EncryptedAssertion')
if encrypted_assertion_nodes:
encrypted_data_nodes = OneLogin_Saml2_XML.query(
encrypted_assertion_nodes[0],
'//saml:EncryptedAssertion/xenc:EncryptedData')
if encrypted_data_nodes:
keyinfo = OneLogin_Saml2_XML.query(
encrypted_assertion_nodes[0],
'//saml:EncryptedAssertion/xenc:EncryptedData/ds:KeyInfo')
if not keyinfo:
raise Exception('No KeyInfo present, invalid Assertion')
keyinfo = keyinfo[0]
children = keyinfo.getchildren()
if not children:
raise Exception('No child to KeyInfo, invalid Assertion')
for child in children:
if 'RetrievalMethod' in child.tag:
if child.attrib[
'Type'] != 'http://www.w3.org/2001/04/xmlenc#EncryptedKey':
raise Exception(
'Unsupported Retrieval Method found')
uri = child.attrib['URI']
if not uri.startswith('#'):
break
uri = uri.split('#')[1]
encrypted_key = OneLogin_Saml2_XML.query(
encrypted_assertion_nodes[0],
'./xenc:EncryptedKey[@Id="' + uri + '"]')
if encrypted_key:
keyinfo.append(encrypted_key[0])
encrypted_data = encrypted_data_nodes[0]
decrypted = OneLogin_Saml2_Utils.decrypt_element(
encrypted_data, key, debug)
xml.replace(encrypted_assertion_nodes[0], decrypted)
return xml
def validate_sign(xml, cert=None, fingerprint=None, fingerprintalg='sha1', validatecert=False, debug=False, xpath=None):
"""
Validates a signature (Message or Assertion).
:param xml: The element we should validate
:type: string | Document
:param cert: The public cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
:param xpath: The xpath of the signed element
:type: string
"""
try:
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
if xpath:
signature_nodes = OneLogin_Saml2_XML.query(elem, xpath)
else:
signature_nodes = OneLogin_Saml2_XML.query(elem, OneLogin_Saml2_Utils.RESPONSE_SIGNATURE_XPATH)
if len(signature_nodes) == 0:
signature_nodes = OneLogin_Saml2_XML.query(elem, OneLogin_Saml2_Utils.ASSERTION_SIGNATURE_XPATH)
if len(signature_nodes) == 1:
signature_node = signature_nodes[0]
return OneLogin_Saml2_Utils.validate_node_sign(signature_node, elem, cert, fingerprint, fingerprintalg, validatecert, debug)
else:
return False
except xmlsec.Error as e:
if debug:
print(e)
return False
def validate_sign(xml, cert=None, fingerprint=None, fingerprintalg="sha1", validatecert=False, debug=False):
"""
Validates a signature (Message or Assertion).
:param xml: The element we should validate
:type: string | Document
:param cert: The pubic cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if xml is None or xml == "":
raise Exception("Empty string supplied as input")
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
signature_nodes = OneLogin_Saml2_XML.query(elem, "/samlp:Response/ds:Signature")
if not len(signature_nodes) > 0:
signature_nodes += OneLogin_Saml2_XML.query(
elem, "/samlp:Response/saml:EncryptedAssertion/saml:Assertion/ds:Signature"
)
signature_nodes += OneLogin_Saml2_XML.query(elem, "/samlp:Response/saml:Assertion/ds:Signature")
if len(signature_nodes) == 1:
signature_node = signature_nodes[0]
return OneLogin_Saml2_Utils.validate_node_sign(
signature_node, elem, cert, fingerprint, fingerprintalg, validatecert, debug
)
else:
return False
except xmlsec.Error as e:
if debug:
print(e)
return False
def get_status(dom):
"""
Gets Status from a Response.
:param dom: The Response as XML
:type: Document
:returns: The Status, an array with the code and a message.
:rtype: dict
"""
status = {}
status_entry = OneLogin_Saml2_XML.query(
dom, '/samlp:Response/samlp:Status')
if len(status_entry) != 1:
raise OneLogin_Saml2_ValidationError(
'Missing Status on response',
OneLogin_Saml2_ValidationError.MISSING_STATUS)
code_entry = OneLogin_Saml2_XML.query(
dom, '/samlp:Response/samlp:Status/samlp:StatusCode',
status_entry[0])
if len(code_entry) != 1:
raise OneLogin_Saml2_ValidationError(
'Missing Status Code on response',
OneLogin_Saml2_ValidationError.MISSING_STATUS_CODE)
code = code_entry[0].values()[0]
if not code:
raise OneLogin_Saml2_ValidationError(
'Missing Status Code on response',
OneLogin_Saml2_ValidationError.MISSING_STATUS_CODE)
status['code'] = code
status['msg'] = ''
message_entry = OneLogin_Saml2_XML.query(
dom, '/samlp:Response/samlp:Status/samlp:StatusMessage',
status_entry[0])
if len(message_entry) == 0:
subcode_entry = OneLogin_Saml2_XML.query(
dom,
'/samlp:Response/samlp:Status/samlp:StatusCode/samlp:StatusCode',
status_entry[0])
if len(subcode_entry) == 1:
status['msg'] = subcode_entry[0].values()[0]
elif len(message_entry) == 1:
status['msg'] = OneLogin_Saml2_XML.element_text(message_entry[0])
return status
def validate_metadata_sign(xml, cert=None, fingerprint=None, fingerprintalg='sha1', validatecert=False, debug=False):
"""
Validates a signature of a EntityDescriptor.
:param xml: The element we should validate
:type: string | Document
:param cert: The pubic cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
"""
try:
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
signature_nodes = OneLogin_Saml2_XML.query(elem, '/md:EntitiesDescriptor/ds:Signature')
if len(signature_nodes) == 0:
signature_nodes += OneLogin_Saml2_XML.query(elem, '/md:EntityDescriptor/ds:Signature')
if len(signature_nodes) == 0:
signature_nodes += OneLogin_Saml2_XML.query(elem, '/md:EntityDescriptor/md:SPSSODescriptor/ds:Signature')
signature_nodes += OneLogin_Saml2_XML.query(elem, '/md:EntityDescriptor/md:IDPSSODescriptor/ds:Signature')
if len(signature_nodes) > 0:
for signature_node in signature_nodes:
if not OneLogin_Saml2_Utils.validate_node_sign(signature_node, elem, cert, fingerprint, fingerprintalg, validatecert, debug):
return False
return True
else:
return False
except Exception:
return False
def get_metadata(url):
"""
Gets the metadata XML from the provided URL
:param url: Url where the XML of the Identity Provider Metadata is published.
:type url: string
:returns: metadata XML
:rtype: string
"""
valid = False
response = urllib2.urlopen(url)
xml = response.read()
if xml:
try:
dom = OneLogin_Saml2_XML.to_etree(xml)
idp_descriptor_nodes = OneLogin_Saml2_XML.query(dom, '//md:IDPSSODescriptor')
if idp_descriptor_nodes:
valid = True
except:
pass
if not valid:
raise Exception('Not valid IdP XML found from URL: %s' % (url))
return xml
def validate_signed_elements(self, signed_elements):
"""
Verifies that the document has the expected signed nodes.
:param signed_elements: The signed elements to be checked
:type signed_elements: list
:param raise_exceptions: Whether to return false on failure or raise an exception
:type raise_exceptions: Boolean
"""
if len(signed_elements) > 2:
return False
response_tag = '{%s}LogoutResponse' % OneLogin_Saml2_Constants.NS_SAMLP
if (response_tag in signed_elements and signed_elements.count(response_tag) > 1) or \
(response_tag not in signed_elements):
return False
# Check that the signed elements found here, are the ones that will be verified
# by OneLogin_Saml2_Utils.validate_sign
if response_tag in signed_elements:
expected_signature_nodes = OneLogin_Saml2_XML.query(
self.document, LOGOUT_RESPONSE_SIGNATURE_XPATH)
if len(expected_signature_nodes) != 1:
print(
'Unexpected number of Response signatures found. SAML Response rejected. Nodes = %s'
% expected_signature_nodes)
raise OneLogin_Saml2_ValidationError(
'Unexpected number of Response signatures found. SAML Response rejected.',
OneLogin_Saml2_ValidationError.
WRONG_NUMBER_OF_SIGNATURES_IN_RESPONSE)
return True
def validate_signed_elements(self, signed_elements):
"""
Verifies that the document has the expected signed nodes.
"""
if len(signed_elements) > 2:
return False
response_tag = '{%s}Response' % OneLogin_Saml2_Constants.NS_SAMLP
assertion_tag = '{%s}Assertion' % OneLogin_Saml2_Constants.NS_SAML
if (response_tag in signed_elements and signed_elements.count(response_tag) > 1) or \
(assertion_tag in signed_elements and signed_elements.count(assertion_tag) > 1) or \
(response_tag not in signed_elements and assertion_tag not in signed_elements):
return False
# Check that the signed elements found here, are the ones that will be verified
# by OneLogin_Saml2_Utils.validate_sign
if response_tag in signed_elements:
expected_signature_nodes = OneLogin_Saml2_XML.query(self.document, OneLogin_Saml2_Utils.RESPONSE_SIGNATURE_XPATH)
if len(expected_signature_nodes) != 1:
raise Exception('Unexpected number of Response signatures found. SAML Response rejected.')
if assertion_tag in signed_elements:
expected_signature_nodes = self.__query(OneLogin_Saml2_Utils.ASSERTION_SIGNATURE_XPATH)
if len(expected_signature_nodes) != 1:
raise Exception('Unexpected number of Assertion signatures found. SAML Response rejected.')
return True
def get_issuers(self):
"""
Gets the issuers (from message and from assertion)
:returns: The issuers
:rtype: list
"""
issuers = set()
message_issuer_nodes = OneLogin_Saml2_XML.query(self.document, '/samlp:Response/saml:Issuer')
if len(message_issuer_nodes) == 1:
issuers.add(message_issuer_nodes[0].text)
else:
raise OneLogin_Saml2_ValidationError(
'Issuer of the Response not found or multiple.',
OneLogin_Saml2_ValidationError.ISSUER_NOT_FOUND_IN_RESPONSE
)
assertion_issuer_nodes = self.__query_assertion('/saml:Issuer')
if len(assertion_issuer_nodes) == 1:
issuers.add(assertion_issuer_nodes[0].text)
else:
raise OneLogin_Saml2_ValidationError(
'Issuer of the Assertion not found or multiple.',
OneLogin_Saml2_ValidationError.ISSUER_NOT_FOUND_IN_ASSERTION
)
return list(set(issuers))
def get_metadata(url):
"""
Gets the metadata XML from the provided URL
:param url: Url where the XML of the Identity Provider Metadata is published.
:type url: string
:returns: metadata XML
:rtype: string
"""
valid = False
response = urllib2.urlopen(url)
xml = response.read()
if xml:
try:
dom = OneLogin_Saml2_XML.to_etree(xml)
idp_descriptor_nodes = OneLogin_Saml2_XML.query(
dom, '//md:IDPSSODescriptor')
if idp_descriptor_nodes:
valid = True
except:
pass
if not valid:
raise Exception('Not valid IdP XML found from URL: %s' % (url))
return xml
def validate_signed_elements(self, signed_elements):
"""
Verifies that the document has the expected signed nodes.
"""
if len(signed_elements) > 2:
return False
response_tag = '{%s}Response' % OneLogin_Saml2_Constants.NS_SAMLP
assertion_tag = '{%s}Assertion' % OneLogin_Saml2_Constants.NS_SAML
if (response_tag in signed_elements and signed_elements.count(response_tag) > 1) or \
(assertion_tag in signed_elements and signed_elements.count(assertion_tag) > 1) or \
(response_tag not in signed_elements and assertion_tag not in signed_elements):
return False
# Check that the signed elements found here, are the ones that will be verified
# by OneLogin_Saml2_Utils.validate_sign
if response_tag in signed_elements:
expected_signature_nodes = OneLogin_Saml2_XML.query(self.document, OneLogin_Saml2_Utils.RESPONSE_SIGNATURE_XPATH)
if len(expected_signature_nodes) != 1:
raise Exception('Unexpected number of Response signatures found. SAML Response rejected.')
if assertion_tag in signed_elements:
expected_signature_nodes = self.__query(OneLogin_Saml2_Utils.ASSERTION_SIGNATURE_XPATH)
if len(expected_signature_nodes) != 1:
raise Exception('Unexpected number of Assertion signatures found. SAML Response rejected.')
return True
def process_signed_elements(self):
"""
Verifies the signature nodes:
- Checks that are Response or Assertion
- Check that IDs and reference URI are unique and consistent.
:returns: The signed elements tag names
:rtype: list
"""
sign_nodes = self.__query('//ds:Signature')
signed_elements = []
verified_seis = []
verified_ids = []
response_tag = '{%s}Response' % OneLogin_Saml2_Constants.NS_SAMLP
assertion_tag = '{%s}Assertion' % OneLogin_Saml2_Constants.NS_SAML
for sign_node in sign_nodes:
signed_element = sign_node.getparent().tag
if signed_element != response_tag and signed_element != assertion_tag:
raise Exception(
'Invalid Signature Element %s SAML Response rejected' %
signed_element)
if not sign_node.getparent().get('ID'):
raise Exception(
'Signed Element must contain an ID. SAML Response rejected'
)
id_value = sign_node.getparent().get('ID')
if id_value in verified_ids:
raise Exception('Duplicated ID. SAML Response rejected')
verified_ids.append(id_value)
# Check that reference URI matches the parent ID and no duplicate References or IDs
ref = OneLogin_Saml2_XML.query(sign_node, './/ds:Reference')
if ref:
ref = ref[0]
if ref.get('URI'):
sei = ref.get('URI')[1:]
if sei != id_value:
raise Exception(
'Found an invalid Signed Element. SAML Response rejected'
)
if sei in verified_seis:
raise Exception(
'Duplicated Reference URI. SAML Response rejected')
verified_seis.append(sei)
signed_elements.append(signed_element)
if signed_elements:
if not self.validate_signed_elements(signed_elements):
raise Exception(
'Found an unexpected Signature Element. SAML Response rejected'
)
return signed_elements
def get_nameid_data(request, key=None):
"""
Gets the NameID Data of the the Logout Request
:param request: Logout Request Message
:type request: string|DOMDocument
:param key: The SP key
:type key: string
:return: Name ID Data (Value, Format, NameQualifier, SPNameQualifier)
:rtype: dict
"""
elem = OneLogin_Saml2_XML.to_etree(request)
name_id = None
encrypted_entries = OneLogin_Saml2_XML.query(
elem, '/samlp:LogoutRequest/saml:EncryptedID')
if len(encrypted_entries) == 1:
if key is None:
raise OneLogin_Saml2_Error(
'Private Key is required in order to decrypt the NameID, check settings',
OneLogin_Saml2_Error.PRIVATE_KEY_NOT_FOUND)
encrypted_data_nodes = OneLogin_Saml2_XML.query(
elem,
'/samlp:LogoutRequest/saml:EncryptedID/xenc:EncryptedData')
if len(encrypted_data_nodes) == 1:
encrypted_data = encrypted_data_nodes[0]
name_id = OneLogin_Saml2_Utils.decrypt_element(
encrypted_data, key)
else:
entries = OneLogin_Saml2_XML.query(
elem, '/samlp:LogoutRequest/saml:NameID')
if len(entries) == 1:
name_id = entries[0]
if name_id is None:
raise OneLogin_Saml2_ValidationError(
'NameID not found in the Logout Request',
OneLogin_Saml2_ValidationError.NO_NAMEID)
name_id_data = {'Value': OneLogin_Saml2_XML.element_text(name_id)}
for attr in ['Format', 'SPNameQualifier', 'NameQualifier']:
if attr in name_id.attrib:
name_id_data[attr] = name_id.attrib[attr]
return name_id_data
def __query(self, query):
"""
Extracts a node from the Etree (Logout Response Message)
:param query: Xpath Expression
:type query: string
:return: The queried node
:rtype: Element
"""
return OneLogin_Saml2_XML.query(self.document, query)
def __query(self, query):
"""
Extracts a node from the Etree (Logout Response Message)
:param query: Xpath Expression
:type query: string
:return: The queried node
:rtype: Element
"""
return OneLogin_Saml2_XML.query(self.document, query)
def __decrypt_assertion(self, xml):
"""
Decrypts the Assertion
:raises: Exception if no private key available
:param xml: Encrypted Assertion
:type xml: Element
:returns: Decrypted Assertion
:rtype: Element
"""
key = self.__settings.get_sp_key()
debug = self.__settings.is_debug_active()
if not key:
raise Exception('No private key available, check settings')
encrypted_assertion_nodes = OneLogin_Saml2_XML.query(xml, '/samlp:Response/saml:EncryptedAssertion')
if encrypted_assertion_nodes:
encrypted_data_nodes = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], '//saml:EncryptedAssertion/xenc:EncryptedData')
if encrypted_data_nodes:
keyinfo = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], '//saml:EncryptedAssertion/xenc:EncryptedData/ds:KeyInfo')
if not keyinfo:
raise Exception('No KeyInfo present, invalid Assertion')
keyinfo = keyinfo[0]
children = keyinfo.getchildren()
if not children:
raise Exception('No child to KeyInfo, invalid Assertion')
for child in children:
if 'RetrievalMethod' in child.tag:
if child.attrib['Type'] != 'http://www.w3.org/2001/04/xmlenc#EncryptedKey':
raise Exception('Unsupported Retrieval Method found')
uri = child.attrib['URI']
if not uri.startswith('#'):
break
uri = uri.split('#')[1]
encrypted_key = OneLogin_Saml2_XML.query(encrypted_assertion_nodes[0], './xenc:EncryptedKey[@Id="' + uri + '"]')
if encrypted_key:
keyinfo.append(encrypted_key[0])
encrypted_data = encrypted_data_nodes[0]
decrypted = OneLogin_Saml2_Utils.decrypt_element(encrypted_data, key, debug)
xml.replace(encrypted_assertion_nodes[0], decrypted)
return xml
def get_nameid_data(request, key=None):
"""
Gets the NameID Data of the the Logout Request
:param request: Logout Request Message
:type request: string|DOMDocument
:param key: The SP key
:type key: string
:return: Name ID Data (Value, Format, NameQualifier, SPNameQualifier)
:rtype: dict
"""
elem = OneLogin_Saml2_XML.to_etree(request)
name_id = None
encrypted_entries = OneLogin_Saml2_XML.query(
elem, '/samlp:LogoutRequest/saml:EncryptedID')
if len(encrypted_entries) == 1:
if key is None:
raise Exception(
'Key is required in order to decrypt the NameID')
encrypted_data_nodes = OneLogin_Saml2_XML.query(
elem,
'/samlp:LogoutRequest/saml:EncryptedID/xenc:EncryptedData')
if len(encrypted_data_nodes) == 1:
encrypted_data = encrypted_data_nodes[0]
name_id = OneLogin_Saml2_Utils.decrypt_element(
encrypted_data, key)
else:
entries = OneLogin_Saml2_XML.query(
elem, '/samlp:LogoutRequest/saml:NameID')
if len(entries) == 1:
name_id = entries[0]
if name_id is None:
raise Exception('Not NameID found in the Logout Request')
name_id_data = {'Value': name_id.text}
for attr in ['Format', 'SPNameQualifier', 'NameQualifier']:
if attr in name_id.attrib:
name_id_data[attr] = name_id.attrib[attr]
return name_id_data
def get_nameid_data(request, key=None):
"""
Gets the NameID Data of the the Logout Request
:param request: Logout Request Message
:type request: string|DOMDocument
:param key: The SP key
:type key: string
:return: Name ID Data (Value, Format, NameQualifier, SPNameQualifier)
:rtype: dict
"""
elem = OneLogin_Saml2_XML.to_etree(request)
name_id = None
encrypted_entries = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/saml:EncryptedID')
if len(encrypted_entries) == 1:
if key is None:
raise Exception('Key is required in order to decrypt the NameID')
encrypted_data_nodes = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/saml:EncryptedID/xenc:EncryptedData')
if len(encrypted_data_nodes) == 1:
encrypted_data = encrypted_data_nodes[0]
name_id = OneLogin_Saml2_Utils.decrypt_element(encrypted_data, key)
else:
entries = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/saml:NameID')
if len(entries) == 1:
name_id = entries[0]
if name_id is None:
raise Exception('Not NameID found in the Logout Request')
name_id_data = {
'Value': name_id.text
}
for attr in ['Format', 'SPNameQualifier', 'NameQualifier']:
if attr in name_id.attrib:
name_id_data[attr] = name_id.attrib[attr]
return name_id_data
def process_signed_elements(self):
"""
Verifies the signature nodes:
- Checks that are Response or Assertion
- Check that IDs and reference URI are unique and consistent.
:returns: The signed elements tag names
:rtype: list
"""
sign_nodes = self.__query('//ds:Signature')
signed_elements = []
verified_seis = []
verified_ids = []
response_tag = '{%s}Response' % OneLogin_Saml2_Constants.NS_SAMLP
assertion_tag = '{%s}Assertion' % OneLogin_Saml2_Constants.NS_SAML
for sign_node in sign_nodes:
signed_element = sign_node.getparent().tag
if signed_element != response_tag and signed_element != assertion_tag:
raise Exception('Invalid Signature Element %s SAML Response rejected' % signed_element)
if not sign_node.getparent().get('ID'):
raise Exception('Signed Element must contain an ID. SAML Response rejected')
id_value = sign_node.getparent().get('ID')
if id_value in verified_ids:
raise Exception('Duplicated ID. SAML Response rejected')
verified_ids.append(id_value)
# Check that reference URI matches the parent ID and no duplicate References or IDs
ref = OneLogin_Saml2_XML.query(sign_node, './/ds:Reference')
if ref:
ref = ref[0]
if ref.get('URI'):
sei = ref.get('URI')[1:]
if sei != id_value:
raise Exception('Found an invalid Signed Element. SAML Response rejected')
if sei in verified_seis:
raise Exception('Duplicated Reference URI. SAML Response rejected')
verified_seis.append(sei)
signed_elements.append(signed_element)
if signed_elements:
if not self.validate_signed_elements(signed_elements):
raise Exception('Found an unexpected Signature Element. SAML Response rejected')
return signed_elements
def get_status(dom):
"""
Gets Status from a Response.
:param dom: The Response as XML
:type: Document
:returns: The Status, an array with the code and a message.
:rtype: dict
"""
status = {}
status_entry = OneLogin_Saml2_XML.query(dom, "/samlp:Response/samlp:Status")
if len(status_entry) == 0:
raise Exception("Missing Status on response")
code_entry = OneLogin_Saml2_XML.query(dom, "/samlp:Response/samlp:Status/samlp:StatusCode", status_entry[0])
if len(code_entry) == 0:
raise Exception("Missing Status Code on response")
code = code_entry[0].values()[0]
status["code"] = code
message_entry = OneLogin_Saml2_XML.query(
dom, "/samlp:Response/samlp:Status/samlp:StatusMessage", status_entry[0]
)
if len(message_entry) == 0:
subcode_entry = OneLogin_Saml2_XML.query(
dom, "/samlp:Response/samlp:Status/samlp:StatusCode/samlp:StatusCode", status_entry[0]
)
if len(subcode_entry) > 0:
status["msg"] = subcode_entry[0].values()[0]
else:
status["msg"] = ""
else:
status["msg"] = message_entry[0].text
return status
def __query(self, query):
"""
Extracts nodes that match the query from the Response
:param query: Xpath Expresion
:type query: String
:returns: The queried nodes
:rtype: list
"""
if self.encrypted:
document = self.decrypted_document
else:
document = self.document
return OneLogin_Saml2_XML.query(document, query)
def get_status(dom):
"""
Gets Status from a Response, including RealMe inner subcode, if present.
This provides a replacement for OneLogin_Saml2_Utils.get_status(), which only
returns a subcode if there is no StatusMessage. RealMe errors return both a
subcode and a sub-code.
:param dom: The Response as XML
:type: Document
:returns: The Status, an array with code, subcode and a message.
:rtype: dict
"""
status = {}
status_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status')
if len(status_entry) != 1:
raise Exception('Missing valid Status on response')
code_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode', status_entry[0])
if len(code_entry) != 1:
raise Exception('Missing valid Status Code on response')
code = code_entry[0].values()[0]
status['code'] = code
subcode_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusCode/samlp:StatusCode', status_entry[0])
if len(subcode_entry) == 1:
status['subcode'] = subcode_entry[0].values()[0]
status['msg'] = ''
message_entry = OneLogin_Saml2_XML.query(dom, '/samlp:Response/samlp:Status/samlp:StatusMessage', status_entry[0])
if len(message_entry) == 1:
status['msg'] = message_entry[0].text
return status
def get_issuer(request):
"""
Gets the Issuer of the Logout Request Message
:param request: Logout Request Message
:type request: string|DOMDocument
:return: The Issuer
:rtype: string
"""
elem = OneLogin_Saml2_XML.to_etree(request)
issuer = None
issuer_nodes = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/saml:Issuer')
if len(issuer_nodes) == 1:
issuer = OneLogin_Saml2_XML.element_text(issuer_nodes[0])
return issuer
def get_issuer(dom):
issuer = {}
issuer_entry = OneLogin_Saml2_XML.query(dom,
'/samlp:Response/saml:Issuer')
if len(issuer_entry) != 1:
raise OneLogin_Saml2_ValidationError(
'Missing Issuer on response',
OneLogin_Saml2_ValidationError.MISSING_ISSUER)
if not issuer_entry[0].text:
raise OneLogin_Saml2_ValidationError(
'Missing Issuer on response',
OneLogin_Saml2_ValidationError.MISSING_ISSUER)
issuer['Format'] = issuer_entry[0].get('Format', None)
return issuer
def get_session_indexes(request):
"""
Gets the SessionIndexes from the Logout Request
:param request: Logout Request Message
:type request: string|DOMDocument
:return: The SessionIndex value
:rtype: list
"""
elem = OneLogin_Saml2_XML.to_etree(request)
session_indexes = []
session_index_nodes = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/samlp:SessionIndex')
for session_index_node in session_index_nodes:
session_indexes.append(OneLogin_Saml2_XML.element_text(session_index_node))
return session_indexes
def get_session_indexes(request):
"""
Gets the SessionIndexes from the Logout Request
:param request: Logout Request Message
:type request: string|DOMDocument
:return: The SessionIndex value
:rtype: list
"""
elem = OneLogin_Saml2_XML.to_etree(request)
session_indexes = []
session_index_nodes = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/samlp:SessionIndex')
for session_index_node in session_index_nodes:
session_indexes.append(session_index_node.text)
return session_indexes
def get_issuer(request):
"""
Gets the Issuer of the Logout Request Message
:param request: Logout Request Message
:type request: string|DOMDocument
:return: The Issuer
:rtype: string
"""
elem = OneLogin_Saml2_XML.to_etree(request)
issuer = None
issuer_nodes = OneLogin_Saml2_XML.query(elem, '/samlp:LogoutRequest/saml:Issuer')
if len(issuer_nodes) == 1:
issuer = issuer_nodes[0].text
return issuer
def __query(self, query):
"""
Extracts nodes that match the query from the Response
:param query: Xpath Expresion
:type query: String
:returns: The queried nodes
:rtype: list
"""
if self.encrypted:
document = self.decrypted_document
else:
document = self.document
return OneLogin_Saml2_XML.query(document, query)
def get_authentication_strength(dom):
"""
Gets authentication strength from a Response
:param dom: The Response as XML, with the Assertion decrypted
:type: Document
:returns: the authentication strength
:rtype: AuthStrength
"""
authn_context_entry = OneLogin_Saml2_XML.query(
dom, '/samlp:Response/saml:Assertion/saml:AuthnStatement/saml:AuthnContext/saml:AuthnContextClassRef')
if len(authn_context_entry) != 1:
raise Exception('Missing authentication context on response')
authn_context = authn_context_entry[0].text
log.debug("found AuthnContextClassRef: %s", authn_context)
return AuthStrength.from_authn_context(authn_context)
def get_metadata(cls, url, validate_cert=True, timeout=None):
"""
Gets the metadata XML from the provided URL
:param url: Url where the XML of the Identity Provider Metadata is published.
:type url: string
:param validate_cert: If the url uses https schema, that flag enables or not the verification of the associated certificate.
:type validate_cert: bool
:param timeout: Timeout in seconds to wait for metadata response
:type timeout: int
:returns: metadata XML
:rtype: string
"""
valid = False
if validate_cert:
response = urllib2.urlopen(url, timeout=timeout)
else:
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
response = urllib2.urlopen(url, context=ctx, timeout=timeout)
xml = response.read()
if xml:
try:
dom = OneLogin_Saml2_XML.to_etree(xml)
idp_descriptor_nodes = OneLogin_Saml2_XML.query(
dom, '//md:IDPSSODescriptor')
if idp_descriptor_nodes:
valid = True
except Exception:
pass
if not valid:
raise Exception('Not valid IdP XML found from URL: %s' % (url))
return xml
def get_issuers(self):
"""
Gets the issuers (from message and from assertion)
:returns: The issuers
:rtype: list
"""
issuers = set()
message_issuer_nodes = OneLogin_Saml2_XML.query(self.document, '/samlp:Response/saml:Issuer')
if len(message_issuer_nodes) == 1:
issuers.add(message_issuer_nodes[0].text)
else:
raise Exception('Issuer of the Response not found or multiple.')
assertion_issuer_nodes = self.__query_assertion('/saml:Issuer')
if len(assertion_issuer_nodes) == 1:
issuers.add(assertion_issuer_nodes[0].text)
else:
raise Exception('Issuer of the Assertion not found or multiple.')
return list(set(issuers))
def get_issuers(self):
"""
Gets the issuers (from message and from assertion)
:returns: The issuers
:rtype: list
"""
issuers = set()
message_issuer_nodes = OneLogin_Saml2_XML.query(self.document, '/samlp:Response/saml:Issuer')
if len(message_issuer_nodes) == 1:
issuers.add(message_issuer_nodes[0].text)
else:
raise Exception('Issuer of the Response not found or multiple.')
assertion_issuer_nodes = self.__query_assertion('/saml:Issuer')
if len(assertion_issuer_nodes) == 1:
issuers.add(assertion_issuer_nodes[0].text)
else:
raise Exception('Issuer of the Assertion not found or multiple.')
return list(set(issuers))
def logout_view(request, *args, **kwargs):
backend = request.backend
logout(request)
# Пользователя разлогинили, теперь нужно ответить провайдеру.
# Для начала нужно узнать, от какого именно IdentityProvider'а пришёл запрос.
# Как минимму OneLogin не присылает в запросе никаких опознавательных знаков кроме атрибута Issuer.
# В Issuer у него находится путь к его метадате. В конфиге тот же путь надо указать в entity_id.
# вынимаем значение Issuer
request_str = compat.to_string(
OneLogin_Saml2_Utils.decode_base64_and_inflate(
request.GET['SAMLRequest']))
xml_doc = OneLogin_Saml2_XML.to_etree(request_str)
issuer_nodes = OneLogin_Saml2_XML.query(
xml_doc, '/samlp:LogoutRequest/saml:Issuer')
if len(issuer_nodes) == 0:
raise ValueError('no Issuer in logout request: ' + request_str)
issuer = issuer_nodes[0].text
# ищем имя IDP
idp_configs = backend.setting('ENABLED_IDPS')
idp_name = next((name for name, cfg in idp_configs.items()
if cfg.get('entity_id') == issuer), None)
if idp_name is None:
raise ValueError(
f"IDP not found for Issuer '{issuer}' in logout request: " +
request_str)
# формируем адрес редиректа
idp = backend.get_idp(idp_name)
if idp.slo_config == {}: # если конфига slo нет
url = settings.LOGOUT_REDIRECT_URL
else:
url = backend._create_saml_auth(
idp, remove_signature_from_get=True).process_slo()
return HttpResponseRedirect(url)
def validate_sign(xml,
cert=None,
fingerprint=None,
fingerprintalg='sha1',
validatecert=False,
debug=False,
xpath=None,
multicerts=None):
"""
Validates a signature (Message or Assertion).
:param xml: The element we should validate
:type: string | Document
:param cert: The public cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
:param xpath: The xpath of the signed element
:type: string
:param multicerts: Multiple public certs
:type: list
:param raise_exceptions: Whether to return false on failure or raise an exception
:type raise_exceptions: Boolean
"""
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
if xpath:
signature_nodes = OneLogin_Saml2_XML.query(elem, xpath)
else:
signature_nodes = OneLogin_Saml2_XML.query(
elem, OneLogin_Saml2_Utils.RESPONSE_SIGNATURE_XPATH)
if len(signature_nodes) == 0:
signature_nodes = OneLogin_Saml2_XML.query(
elem, OneLogin_Saml2_Utils.ASSERTION_SIGNATURE_XPATH)
if len(signature_nodes) == 1:
signature_node = signature_nodes[0]
if not multicerts:
return OneLogin_Saml2_Utils.validate_node_sign(
signature_node,
elem,
cert,
fingerprint,
fingerprintalg,
validatecert,
debug,
raise_exceptions=True)
else:
# If multiple certs are provided, I may ignore cert and
# fingerprint provided by the method and just check the
# certs multicerts
fingerprint = fingerprintalg = None
for cert in multicerts:
if OneLogin_Saml2_Utils.validate_node_sign(
signature_node,
elem,
cert,
fingerprint,
fingerprintalg,
validatecert,
False,
raise_exceptions=False):
return True
raise OneLogin_Saml2_ValidationError(
'Signature validation failed. SAML Response rejected.',
OneLogin_Saml2_ValidationError.INVALID_SIGNATURE)
else:
raise OneLogin_Saml2_ValidationError(
'Expected exactly one signature node; got {}.'.format(
len(signature_nodes)),
OneLogin_Saml2_ValidationError.WRONG_NUMBER_OF_SIGNATURES)
def add_sign(xml,
key,
cert,
debug=False,
sign_algorithm=OneLogin_Saml2_Constants.RSA_SHA1,
digest_algorithm=OneLogin_Saml2_Constants.SHA1):
"""
Adds signature key and senders certificate to an element (Message or
Assertion).
:param xml: The element we should sign
:type: string | Document
:param key: The private key
:type: string
:param cert: The public
:type: string
:param debug: Activate the xmlsec debug
:type: bool
:param sign_algorithm: Signature algorithm method
:type sign_algorithm: string
:param digest_algorithm: Digest algorithm method
:type digest_algorithm: string
:returns: Signed XML
:rtype: string
"""
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
sign_algorithm_transform_map = {
OneLogin_Saml2_Constants.DSA_SHA1: xmlsec.Transform.DSA_SHA1,
OneLogin_Saml2_Constants.RSA_SHA1: xmlsec.Transform.RSA_SHA1,
OneLogin_Saml2_Constants.RSA_SHA256: xmlsec.Transform.RSA_SHA256,
OneLogin_Saml2_Constants.RSA_SHA384: xmlsec.Transform.RSA_SHA384,
OneLogin_Saml2_Constants.RSA_SHA512: xmlsec.Transform.RSA_SHA512
}
sign_algorithm_transform = sign_algorithm_transform_map.get(
sign_algorithm, xmlsec.Transform.RSA_SHA1)
signature = xmlsec.template.create(elem,
xmlsec.Transform.EXCL_C14N,
sign_algorithm_transform,
ns='ds')
issuer = OneLogin_Saml2_XML.query(elem, '//saml:Issuer')
if len(issuer) > 0:
issuer = issuer[0]
issuer.addnext(signature)
elem_to_sign = issuer.getparent()
else:
entity_descriptor = OneLogin_Saml2_XML.query(
elem, '//md:EntityDescriptor')
if len(entity_descriptor) > 0:
elem.insert(0, signature)
else:
elem[0].insert(0, signature)
elem_to_sign = elem
elem_id = elem_to_sign.get('ID', None)
if elem_id is not None:
if elem_id:
elem_id = '#' + elem_id
else:
generated_id = generated_id = OneLogin_Saml2_Utils.generate_unique_id(
)
elem_id = '#' + generated_id
elem_to_sign.attrib['ID'] = generated_id
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem_to_sign, ["ID"])
digest_algorithm_transform_map = {
OneLogin_Saml2_Constants.SHA1: xmlsec.Transform.SHA1,
OneLogin_Saml2_Constants.SHA256: xmlsec.Transform.SHA256,
OneLogin_Saml2_Constants.SHA384: xmlsec.Transform.SHA384,
OneLogin_Saml2_Constants.SHA512: xmlsec.Transform.SHA512
}
digest_algorithm_transform = digest_algorithm_transform_map.get(
digest_algorithm, xmlsec.Transform.SHA1)
ref = xmlsec.template.add_reference(signature,
digest_algorithm_transform,
uri=elem_id)
xmlsec.template.add_transform(ref, xmlsec.Transform.ENVELOPED)
xmlsec.template.add_transform(ref, xmlsec.Transform.EXCL_C14N)
key_info = xmlsec.template.ensure_key_info(signature)
xmlsec.template.add_x509_data(key_info)
dsig_ctx = xmlsec.SignatureContext()
sign_key = xmlsec.Key.from_memory(key, xmlsec.KeyFormat.PEM, None)
sign_key.load_cert_from_memory(cert, xmlsec.KeyFormat.PEM)
dsig_ctx.key = sign_key
dsig_ctx.sign(signature)
return OneLogin_Saml2_XML.to_string(elem)
def validate_node_sign(signature_node,
elem,
cert=None,
fingerprint=None,
fingerprintalg='sha1',
validatecert=False,
debug=False):
"""
Validates a signature node.
:param signature_node: The signature node
:type: Node
:param xml: The element we should validate
:type: Document
:param cert: The public cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
:param raise_exceptions: Whether to return false on failure or raise an exception
:type raise_exceptions: Boolean
"""
if (cert is None or cert == '') and fingerprint:
x509_certificate_nodes = OneLogin_Saml2_XML.query(
signature_node,
'//ds:Signature/ds:KeyInfo/ds:X509Data/ds:X509Certificate')
if len(x509_certificate_nodes) > 0:
x509_certificate_node = x509_certificate_nodes[0]
x509_cert_value = OneLogin_Saml2_XML.element_text(
x509_certificate_node)
x509_cert_value_formatted = OneLogin_Saml2_Utils.format_cert(
x509_cert_value)
x509_fingerprint_value = OneLogin_Saml2_Utils.calculate_x509_fingerprint(
x509_cert_value_formatted, fingerprintalg)
if fingerprint == x509_fingerprint_value:
cert = x509_cert_value_formatted
if cert is None or cert == '':
raise OneLogin_Saml2_Error(
'Could not validate node signature: No certificate provided.',
OneLogin_Saml2_Error.CERT_NOT_FOUND)
# Check if Reference URI is empty
reference_elem = OneLogin_Saml2_XML.query(signature_node,
'//ds:Reference')
if len(reference_elem) > 0:
if reference_elem[0].get('URI') == '':
reference_elem[0].set(
'URI', '#%s' % signature_node.getparent().get('ID'))
if validatecert:
manager = xmlsec.KeysManager()
manager.load_cert_from_memory(cert, xmlsec.KeyFormat.CERT_PEM,
xmlsec.KeyDataType.TRUSTED)
dsig_ctx = xmlsec.SignatureContext(manager)
else:
dsig_ctx = xmlsec.SignatureContext()
dsig_ctx.key = xmlsec.Key.from_memory(cert,
xmlsec.KeyFormat.CERT_PEM,
None)
dsig_ctx.set_enabled_key_data([xmlsec.KeyData.X509])
try:
dsig_ctx.verify(signature_node)
except Exception as err:
raise OneLogin_Saml2_ValidationError(
'Signature validation failed. SAML Response rejected. %s',
OneLogin_Saml2_ValidationError.INVALID_SIGNATURE, str(err))
return True
def parse(idp_metadata):
"""
Parse the Identity Provider metadata and returns a dict with extracted data
If there are multiple IDPSSODescriptor it will only parse the first
:param idp_metadata: XML of the Identity Provider Metadata.
:type idp_metadata: string
:param url: If true and the URL is HTTPs, the cert of the domain is checked.
:type url: bool
:returns: settings dict with extracted data
:rtype: string
"""
data = {}
dom = OneLogin_Saml2_XML.to_etree(idp_metadata)
entity_descriptor_nodes = OneLogin_Saml2_XML.query(dom, '//md:EntityDescriptor')
idp_entity_id = want_authn_requests_signed = idp_name_id_format = idp_sso_url = idp_slo_url = idp_x509_cert = None
if len(entity_descriptor_nodes) > 0:
for entity_descriptor_node in entity_descriptor_nodes:
idp_descriptor_nodes = OneLogin_Saml2_XML.query(entity_descriptor_node, './md:IDPSSODescriptor')
if len(idp_descriptor_nodes) > 0:
idp_descriptor_node = idp_descriptor_nodes[0]
idp_entity_id = entity_descriptor_node.get('entityID', None)
want_authn_requests_signed = entity_descriptor_node.get('WantAuthnRequestsSigned', None)
name_id_format_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, './md:NameIDFormat')
if len(name_id_format_nodes) > 0:
idp_name_id_format = name_id_format_nodes[0].text
sso_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, "./md:SingleSignOnService[@Binding='%s']" % OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT)
if len(sso_nodes) > 0:
idp_sso_url = sso_nodes[0].get('Location', None)
slo_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, "./md:SingleLogoutService[@Binding='%s']" % OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT)
if len(slo_nodes) > 0:
idp_slo_url = slo_nodes[0].get('Location', None)
cert_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, "./md:KeyDescriptor[@use='signing']/ds:KeyInfo/ds:X509Data/ds:X509Certificate")
if len(cert_nodes) > 0:
idp_x509_cert = cert_nodes[0].text
data['idp'] = {}
if idp_entity_id is not None:
data['idp']['entityId'] = idp_entity_id
if idp_sso_url is not None:
data['idp']['singleLogoutService'] = {}
data['idp']['singleLogoutService']['url'] = idp_sso_url
if idp_slo_url is not None:
data['idp']['singleLogoutService'] = {}
data['idp']['singleLogoutService']['url'] = idp_slo_url
if idp_x509_cert is not None:
data['idp']['x509cert'] = idp_x509_cert
if want_authn_requests_signed is not None:
data['security'] = {}
data['security']['authnRequestsSigned'] = want_authn_requests_signed
if idp_name_id_format:
data['sp'] = {}
data['sp']['NameIDFormat'] = idp_name_id_format
break
return data
def add_sign(xml, key, cert, debug=False, sign_algorithm=OneLogin_Saml2_Constants.RSA_SHA1):
"""
Adds signature key and senders certificate to an element (Message or
Assertion).
:param xml: The element we should sign
:type: string | Document
:param key: The private key
:type: string
:param cert: The public
:type: string
:param debug: Activate the xmlsec debug
:type: bool
:param sign_algorithm: Signature algorithm method
:type sign_algorithm: string
"""
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
# Sign the metadata with our private key.
sign_algorithm_transform_map = {
OneLogin_Saml2_Constants.DSA_SHA1: xmlsec.Transform.DSA_SHA1,
OneLogin_Saml2_Constants.RSA_SHA1: xmlsec.Transform.RSA_SHA1,
OneLogin_Saml2_Constants.RSA_SHA256: xmlsec.Transform.RSA_SHA256,
OneLogin_Saml2_Constants.RSA_SHA384: xmlsec.Transform.RSA_SHA384,
OneLogin_Saml2_Constants.RSA_SHA512: xmlsec.Transform.RSA_SHA512
}
sign_algorithm_transform = sign_algorithm_transform_map.get(sign_algorithm, xmlsec.Transform.RSA_SHA1)
signature = xmlsec.template.create(elem, xmlsec.Transform.EXCL_C14N, sign_algorithm_transform, ns='ds')
issuer = OneLogin_Saml2_XML.query(elem, '//saml:Issuer')
if len(issuer) > 0:
issuer = issuer[0]
issuer.addnext(signature)
else:
elem[0].insert(0, signature)
elem_id = elem.get('ID', None)
if elem_id:
elem_id = '#' + elem_id
ref = xmlsec.template.add_reference(signature, xmlsec.Transform.SHA1, uri=elem_id)
xmlsec.template.add_transform(ref, xmlsec.Transform.ENVELOPED)
xmlsec.template.add_transform(ref, xmlsec.Transform.EXCL_C14N)
key_info = xmlsec.template.ensure_key_info(signature)
xmlsec.template.add_x509_data(key_info)
dsig_ctx = xmlsec.SignatureContext()
sign_key = xmlsec.Key.from_memory(key, xmlsec.KeyFormat.PEM, None)
sign_key.load_cert_from_memory(cert, xmlsec.KeyFormat.PEM)
dsig_ctx.key = sign_key
dsig_ctx.sign(signature)
return OneLogin_Saml2_XML.to_string(elem)
def parse(
idp_metadata,
required_sso_binding=OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT,
required_slo_binding=OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT,
index=0):
"""
Parses the Identity Provider metadata and return a dict with extracted data.
If there are multiple <IDPSSODescriptor> tags, parse only the first.
Parses only those SSO endpoints with the same binding as given by
the `required_sso_binding` parameter.
Parses only those SLO endpoints with the same binding as given by
the `required_slo_binding` parameter.
If the metadata specifies multiple SSO endpoints with the required
binding, extract only the first (the same holds true for SLO
endpoints).
:param idp_metadata: XML of the Identity Provider Metadata.
:type idp_metadata: string
:param required_sso_binding: Parse only POST or REDIRECT SSO endpoints.
:type required_sso_binding: one of OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT
or OneLogin_Saml2_Constants.BINDING_HTTP_POST
:param required_slo_binding: Parse only POST or REDIRECT SLO endpoints.
:type required_slo_binding: one of OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT
or OneLogin_Saml2_Constants.BINDING_HTTP_POST
:param index: If the metadata contains more than 1 certificate, use index to get the right certificate.
:type index: number
:returns: settings dict with extracted data
:rtype: dict
"""
data = {}
dom = OneLogin_Saml2_XML.to_etree(idp_metadata)
entity_descriptor_nodes = OneLogin_Saml2_XML.query(dom, '//md:EntityDescriptor')
idp_entity_id = want_authn_requests_signed = idp_name_id_format = idp_sso_url = idp_slo_url = idp_x509_cert = None
if len(entity_descriptor_nodes) > 0:
for entity_descriptor_node in entity_descriptor_nodes:
idp_descriptor_nodes = OneLogin_Saml2_XML.query(entity_descriptor_node, './md:IDPSSODescriptor')
if len(idp_descriptor_nodes) > 0:
idp_descriptor_node = idp_descriptor_nodes[0]
idp_entity_id = entity_descriptor_node.get('entityID', None)
want_authn_requests_signed = entity_descriptor_node.get('WantAuthnRequestsSigned', None)
name_id_format_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, './md:NameIDFormat')
if len(name_id_format_nodes) > 0:
idp_name_id_format = name_id_format_nodes[0].text
sso_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:SingleSignOnService[@Binding='%s']" % required_sso_binding
)
if len(sso_nodes) > 0:
idp_sso_url = sso_nodes[0].get('Location', None)
slo_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:SingleLogoutService[@Binding='%s']" % required_slo_binding
)
if len(slo_nodes) > 0:
idp_slo_url = slo_nodes[0].get('Location', None)
# Attempt to extract the cert/public key to be used for
# verifying signatures (as opposed to extracing a key to be
# used for encryption), by specifying `use=signing` in the
# XPath expression. If that does not yield a cert, retry
# using a more relaxed XPath expression (the `use` attribute
# is optional according to the saml-metadata-2.0-os spec).
cert_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:KeyDescriptor[@use='signing']/ds:KeyInfo/ds:X509Data/ds:X509Certificate"
)
if not cert_nodes:
cert_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:KeyDescriptor/ds:KeyInfo/ds:X509Data/ds:X509Certificate"
)
if len(cert_nodes) > 0:
idp_x509_cert = OneLogin_Saml2_Utils.format_cert(cert_nodes[index].text, False)
data['idp'] = {}
if idp_entity_id is not None:
data['idp']['entityId'] = idp_entity_id
if idp_sso_url is not None:
data['idp']['singleSignOnService'] = {}
data['idp']['singleSignOnService']['url'] = idp_sso_url
data['idp']['singleSignOnService']['binding'] = required_sso_binding
if idp_slo_url is not None:
data['idp']['singleLogoutService'] = {}
data['idp']['singleLogoutService']['url'] = idp_slo_url
data['idp']['singleLogoutService']['binding'] = required_slo_binding
if idp_x509_cert is not None:
data['idp']['x509cert'] = idp_x509_cert
if want_authn_requests_signed is not None:
data['security'] = {}
data['security']['authnRequestsSigned'] = want_authn_requests_signed
if idp_name_id_format:
data['sp'] = {}
data['sp']['NameIDFormat'] = idp_name_id_format
break
return data
def validate_sign(xml,
cert=None,
fingerprint=None,
fingerprintalg='sha1',
validatecert=False,
debug=False,
xpath=None):
"""
Validates a signature (Message or Assertion).
:param xml: The element we should validate
:type: string | Document
:param cert: The public cert
:type: string
:param fingerprint: The fingerprint of the public cert
:type: string
:param fingerprintalg: The algorithm used to build the fingerprint
:type: string
:param validatecert: If true, will verify the signature and if the cert is valid.
:type: bool
:param debug: Activate the xmlsec debug
:type: bool
:param xpath: The xpath of the signed element
:type: string
:param raise_exceptions: Whether to return false on failure or raise an exception
:type raise_exceptions: Boolean
"""
if xml is None or xml == '':
raise Exception('Empty string supplied as input')
elem = OneLogin_Saml2_XML.to_etree(xml)
xmlsec.enable_debug_trace(debug)
xmlsec.tree.add_ids(elem, ["ID"])
if xpath:
signature_nodes = OneLogin_Saml2_XML.query(elem, xpath)
else:
signature_nodes = OneLogin_Saml2_XML.query(
elem, OneLogin_Saml2_Utils.RESPONSE_SIGNATURE_XPATH)
if len(signature_nodes) == 0:
signature_nodes = OneLogin_Saml2_XML.query(
elem, OneLogin_Saml2_Utils.ASSERTION_SIGNATURE_XPATH)
if len(signature_nodes) == 1:
signature_node = signature_nodes[0]
# Raises expection if invalid
return OneLogin_Saml2_Utils.validate_node_sign(
signature_node,
elem,
cert,
fingerprint,
fingerprintalg,
validatecert,
debug,
raise_exceptions=True)
else:
raise OneLogin_Saml2_ValidationError(
'Expected exactly one signature node; got {}.'.format(
len(signature_nodes)),
OneLogin_Saml2_ValidationError.WRONG_NUMBER_OF_SIGNATURES)
def parse(
idp_metadata,
required_sso_binding=OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT,
required_slo_binding=OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT):
"""
Parses the Identity Provider metadata and return a dict with extracted data.
If there are multiple <IDPSSODescriptor> tags, parse only the first.
Parses only those SSO endpoints with the same binding as given by
the `required_sso_binding` parameter.
Parses only those SLO endpoints with the same binding as given by
the `required_slo_binding` parameter.
If the metadata specifies multiple SSO endpoints with the required
binding, extract only the first (the same holds true for SLO
endpoints).
:param idp_metadata: XML of the Identity Provider Metadata.
:type idp_metadata: string
:param required_sso_binding: Parse only POST or REDIRECT SSO endpoints.
:type required_sso_binding: one of OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT
or OneLogin_Saml2_Constants.BINDING_HTTP_POST
:param required_slo_binding: Parse only POST or REDIRECT SLO endpoints.
:type required_slo_binding: one of OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT
or OneLogin_Saml2_Constants.BINDING_HTTP_POST
:returns: settings dict with extracted data
:rtype: dict
"""
data = {}
dom = OneLogin_Saml2_XML.to_etree(idp_metadata)
entity_descriptor_nodes = OneLogin_Saml2_XML.query(dom, '//md:EntityDescriptor')
idp_entity_id = want_authn_requests_signed = idp_name_id_format = idp_sso_url = idp_slo_url = idp_x509_cert = None
if len(entity_descriptor_nodes) > 0:
for entity_descriptor_node in entity_descriptor_nodes:
idp_descriptor_nodes = OneLogin_Saml2_XML.query(entity_descriptor_node, './md:IDPSSODescriptor')
if len(idp_descriptor_nodes) > 0:
idp_descriptor_node = idp_descriptor_nodes[0]
idp_entity_id = entity_descriptor_node.get('entityID', None)
want_authn_requests_signed = entity_descriptor_node.get('WantAuthnRequestsSigned', None)
name_id_format_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, './md:NameIDFormat')
if len(name_id_format_nodes) > 0:
idp_name_id_format = name_id_format_nodes[0].text
sso_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:SingleSignOnService[@Binding='%s']" % required_sso_binding
)
if len(sso_nodes) > 0:
idp_sso_url = sso_nodes[0].get('Location', None)
slo_nodes = OneLogin_Saml2_XML.query(
idp_descriptor_node,
"./md:SingleLogoutService[@Binding='%s']" % required_slo_binding
)
if len(slo_nodes) > 0:
idp_slo_url = slo_nodes[0].get('Location', None)
cert_nodes = OneLogin_Saml2_XML.query(idp_descriptor_node, "./md:KeyDescriptor[@use='signing']/ds:KeyInfo/ds:X509Data/ds:X509Certificate")
if len(cert_nodes) > 0:
idp_x509_cert = cert_nodes[0].text
data['idp'] = {}
if idp_entity_id is not None:
data['idp']['entityId'] = idp_entity_id
if idp_sso_url is not None:
data['idp']['singleSignOnService'] = {}
data['idp']['singleSignOnService']['url'] = idp_sso_url
data['idp']['singleSignOnService']['binding'] = required_sso_binding
if idp_slo_url is not None:
data['idp']['singleLogoutService'] = {}
data['idp']['singleLogoutService']['url'] = idp_slo_url
data['idp']['singleLogoutService']['binding'] = required_slo_binding
if idp_x509_cert is not None:
data['idp']['x509cert'] = idp_x509_cert
if want_authn_requests_signed is not None:
data['security'] = {}
data['security']['authnRequestsSigned'] = want_authn_requests_signed
if idp_name_id_format:
data['sp'] = {}
data['sp']['NameIDFormat'] = idp_name_id_format
break
return data