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authenticator.py
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authenticator.py
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import base64
import requests
import re
from jinja2 import Template
import random
import string
import platform
import json
import cms
import card
import logging
class authenticator:
def __init__(self):
self.gac_version = 'GACv10. 0. 0. 1'
self.pkcs11lib = '/usr/lib/ClassicClient/libgclib.so'
self.auth_uri = 'http://10.211.55.3:5000'
self.auth_uri = 'https://gas.nis1.national.ncrs.nhs.uk'
self.ip_address = '127.0.0.1'
self.device_id = ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(8))
self.auth_session = {}
self.user_agent = 'Mozilla/4.0(compatible;IE;%s)' % self.gac_version
self.smime_header = """MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/x-pkcs7-mime; name="smime.p7m"
Content-Transfer-Encoding: base64
"""
self.auth_activate_template = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE USER SYSTEM "gpOBJECT.DTD">
<gpOBJECT>
<gpPARAM name="auth_method">3</gpPARAM>
<gpPARAM name="app_url">NHST</gpPARAM>
<gpPARAM name="log_session_id">{{ session_id }}</gpPARAM>
<gpPARAM name="device_id">{{ device_id }},ClientIP={{ ip }}</gpPARAM>
<gpPARAM name="service">ACTIVATION</gpPARAM>
</gpOBJECT>"""
self.auth_validate_template = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE USER SYSTEM "gpOBJECT.DTD">
<gpOBJECT>
<gpPARAM name="auth_method">3</gpPARAM>
<gpPARAM name="app_url">NHST</gpPARAM>
<gpPARAM name="log_session_id">{{ session_id }}</gpPARAM>
<gpPARAM name="device_id">{{ device_id }},ClientIP={{ ip }}</gpPARAM>
<gpPARAM name="service">AUTHENTICATION</gpPARAM>
<gpPARAM name="challenge">{{ challenge }}</gpPARAM>
<gpPARAM name="signature">{{ signature }}</gpPARAM>
<gpPARAM name="uid">{{ uid }}</gpPARAM>
<gpPARAM name="card_type">p11</gpPARAM>
<gpPARAM name="response" encoding="base64">{{ response }}</gpPARAM>
<gpPARAM name="mobility">0</gpPARAM>
</gpOBJECT>"""
self.auth_logout_template = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE USER SYSTEM "gpOBJECT.DTD">
<gpOBJECT>
<gpPARAM name="service">LOGOUT</gpPARAM>
<gpPARAM name="sso_ticket">{{ ticket }}</gpPARAM>
<gpPARAM name="log_session_id">{{ session_id }}</gpPARAM>
<gpPARAM name="device_id">{{ device_id }},ClientIP={{ ip }}</gpPARAM>
<gpPARAM name="uid">{{ uid }}</gpPARAM>
</gpOBJECT>"""
self.analytics = {
'OSVersion': platform.platform(),
'Mode': 'Normal',
'TrainingMode': 'False',
'WinTabModeEnabled': 'False',
'RemoteSession': 'False',
'CardReaders': [],
'ATR': None,
'SessionId': None
}
self.role_select_uri = '%s/saml/RoleSelectionGP.jsp' % self.auth_uri
self.log = logging.getLogger('authenticator')
self.log.setLevel(logging.DEBUG)
fh = logging.FileHandler('authenticator.log')
fh.setLevel(logging.DEBUG)
self.log.addHandler(fh)
formatter = logging.Formatter('%(asctime)s %(name)s %(levelname)s %(message)s')
fh.setFormatter(formatter)
self.log.info("Authenticator started")
def authenticate(self, passcode, atr=None):
session = {'id': ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(10)),
'analytics': self.analytics.copy(),}
session['analytics']['SessionId'] = session['id']
session['analytics']['ATR'] = atr
self._auth_activate(session)
self.log.info('Method=authenticate, Message=Activate Received, Session=%s' % session)
card.sign(self.pkcs11lib, passcode, session)
self.log.info('Method=authenticate, Message=Challenge Signed, Session=%s' % session)
self._auth_validate(session)
self.log.info('Method=authenticate, Message=Validate Received, Session=%s' % session)
self._role_select(session)
self.log.info('Method=authenticate, Message=RoleSelect Received, Session=%s' % session)
return session
def logout(self):
logout_body_template = Template(self.auth_logout_template)
logout_body = logout_body_template.render(ticket = self.auth_params['sso_ticket'],
uid = self.auth_params['uid'],
device_id = self.device_id,
ip = self.ip_address,
session_id = self.session_id)
requests.get(self.auth_params['sso_logout_url'],
verify=False,
headers={'User-Agent': self.user_agent},
data=logout_body)
def _auth_activate(self, session):
auth_activate_template = Template(self.auth_activate_template)
auth_activate_body = auth_activate_template.render(device_id = self.device_id,
ip = self.ip_address,
session_id = session['id'])
self.log.info('Method=_auth_activate, Message=Calling Activate, Body=%s' % auth_activate_body)
auth_activate = requests.post('%s/login/authactivate' % self.auth_uri,
verify=False,
data=auth_activate_body,
headers={'User-Agent': self.user_agent,
'Analytics': json.dumps(session['analytics'])})
body = auth_activate.content.decode('utf-8')
self.log.info('Method=_auth_activate, Message=Activate Response Recevied, Status=%s, Body=%s' % (auth_activate.status_code, body))
session['challenge'] = self._extract_parameter(body, 'challenge')
session['activate_signature'] = self._extract_parameter(body, 'signature')
self.log.info('Method=_auth_activate, Challenge=%s, Server Signature=%s' % (session['challenge'], session['activate_signature']))
def _auth_validate(self, session):
cms_envelope = base64.b64encode(cms.envelope(session['challenge'],
session['certificate'],
session['signature'])).decode('utf-8')
self.log.info('Method=_auth_validate, Message=CMS Envelope Built, CMS=%s' % cms_envelope)
auth_validate_request_signature_raw = '%s%s' % (self.smime_header, cms_envelope)
auth_validate_request_signature_encoded = base64.b64encode(auth_validate_request_signature_raw.encode('utf-8'))
auth_validate_template = Template(self.auth_validate_template)
auth_validate_body = auth_validate_template.render(uid = session['uid'],
device_id = self.device_id,
ip = self.ip_address,
session_id = session['id'],
challenge = session['challenge'],
signature = session['activate_signature'],
response = auth_validate_request_signature_encoded.decode('utf-8'))
self.log.info('Method=_auth_validate, Message=Validate Request Prepared, Request=%s' % auth_validate_body)
auth_validate_response = requests.post('%s/login/authvalidate' % self.auth_uri,
verify=False,
headers={'User-Agent': self.user_agent,
'Analytics': json.dumps(session['analytics'])},
data=auth_validate_body)
body = auth_validate_response.content.decode('utf-8')
self.log.info('Method=_auth_validate, Message=Validate Response Received, Status=%s, Body=%s' % (auth_validate_response.status_code, body))
self._parse_validate_response(body, session)
def _role_select(self, session):
if (len(session['roles']) > 0):
uri = self.role_select_uri
requests.get(uri,
verify=False,
headers={'User-Agent': self.user_agent,
'Analytics': json.dumps(session['analytics'])},
params={'token': session['sso_ticket'],
'selectedRoleUid': session['roles'][0]['id'],
'ssbMode': 0,
'fallbackStatus': 0,
'gacVersion': self.gac_version})
def _parse_validate_response(self, auth_validate_response, session):
session['roles'] = []
session['sso_ticket'] = re.findall('(?:sso_ticket\">)([^<]*)', auth_validate_response)[0]
session['cn'] = re.findall('(?:cn\">)([^<]*)', auth_validate_response)[0]
session['sso_logout_url'] = re.findall('(?:sso_logout_url\">)([^<]*)', auth_validate_response)[0]
for l in auth_validate_response.split('\n'):
if 'name="nhsjobrole' in l:
session['roles'].append(self._extract_role(l))
def _extract_parameter(self, body, parameter_name):
return re.findall('(?:%s\">)([a-z,A-Z,0-9,/+=]*)' % parameter_name, body)[0]
def _extract_role(self, role_line):
ret = {}
ret['org_code'] = re.findall('(?:orgcode=\")([^\"]*)', role_line)[0]
role_string = re.findall('(?:>)([^<]*)', role_line)[0]
role_parts_a = role_string.split(',')
role_parts_b = role_parts_a[1].split(':')
ret['org_name'] = role_parts_a[0]
ret['name'] = role_parts_b[2].strip('"')
ret['type'] = role_parts_b[0].strip('"')
ret['sub_type'] = role_parts_b[1].strip('"')
ret['id'] = re.findall('(?:id=\")([^\"]*)', role_line)[0]
return ret