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SAML certificate fix and enhancement

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Problems resolved:

- Method create_self_signed_cert() was invoked nowhere. This puts parameter "SAML_SIGN_REQUEST" description in configs/development.py as incorrect
- Method create_self_signed_cert() was returning error while trying to write out certificate and private key. File handler was opened for writing out TEXT instead of BINARY data

Enhancements:

- Two new parameters are introduced SAML_CERT_FILE and SAML_KEY_FILE. User can now explicitly define own certificate and key file anywhere on file-system.
- If parameters mentioned in previous bullet aren't explicitly defined, in PowerDNS-Admin root directory self-signed certificate will be created.
- Certificates will be used or generated in any case, because in saml.py there are explicit parameters defined which require certificate/key in order to work normally. If they aren't, exception will be thrown. Examples of parameters defined in saml.py requiring certificate: wantAssertionsEncrypted, signMetadata, wantAssertionsSigned.
This commit is contained in:
Neven1986 2019-12-19 00:40:25 +01:00
parent 37f24f9fde
commit 567430790c
3 changed files with 43 additions and 11 deletions
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16
configs/development.py
View file

@ -82,8 +82,20 @@ SAML_ENABLED = False
# SAML_SP_ENTITY_ID = 'http://<SAML SP Entity ID>'
# SAML_SP_CONTACT_NAME = '<contact name>'
# SAML_SP_CONTACT_MAIL = '<contact mail>'
# #Cofigures if SAML tokens should be encrypted.
# #If enabled a new app certificate will be generated on restart
# Configures the path to certificate file and it's respective private key file
# This pair is used for signing metadata, encrypting tokens and all other signing/encryption
# tasks during communication between iDP and SP
# NOTE: if this two parameters aren't explicitly provided, self-signed certificate-key pair
# will be generated in "PowerDNS-Admin" root directory
# ###########################################################################################
# CAUTION: For production use, usage of self-signed certificates it's highly discouraged.
# Use certificates from trusted CA instead
# ###########################################################################################
# SAML_CERT_FILE = '/etc/pki/powerdns-admin/cert.crt'
# SAML_CERT_KEY = '/etc/pki/powerdns-admin/key.pem'
# Cofigures if SAML tokens should be encrypted.
# SAML_SIGN_REQUEST = False
# #Use SAML standard logout mechanism retreived from idp metadata
# #If configured false don't care about SAML session on logout.

4
powerdnsadmin/lib/certutil.py
View file

@ -42,7 +42,7 @@ def create_self_signed_cert():
cert.set_pubkey(k)
cert.sign(k, 'sha256')
open(CERT_FILE, "wt").write(
open(CERT_FILE, "bw").write(
crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
open(KEY_FILE, "wt").write(
open(KEY_FILE, "bw").write(
crypto.dump_privatekey(crypto.FILETYPE_PEM, k))

34
powerdnsadmin/services/saml.py
View file

@ -3,7 +3,7 @@ from threading import Thread
from flask import current_app
import os
from ..lib.certutil import KEY_FILE, CERT_FILE
from ..lib.certutil import KEY_FILE, CERT_FILE, create_self_signed_cert
from ..lib.utils import urlparse
class SAML(object):
@ -101,12 +101,32 @@ class SAML(object):
'NameIDFormat',
'urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified')
settings['sp']['entityId'] = current_app.config['SAML_SP_ENTITY_ID']
if os.path.isfile(CERT_FILE):
cert = open(CERT_FILE, "r").readlines()
settings['sp']['x509cert'] = "".join(cert)
if os.path.isfile(KEY_FILE):
key = open(KEY_FILE, "r").readlines()
settings['sp']['privateKey'] = "".join(key)
if ('SAML_CERT_FILE' in current_app.config) and ('SAML_KEY_FILE' in current_app.config):
saml_cert_file = current_app.config['SAML_CERT_FILE']
saml_key_file = current_app.config['SAML_KEY_FILE']
if os.path.isfile(saml_cert_file):
cert = open(saml_cert_file, "r").readlines()
settings['sp']['x509cert'] = "".join(cert)
if os.path.isfile(saml_key_file):
key = open(saml_key_file, "r").readlines()
settings['sp']['privateKey'] = "".join(key)
else:
create_self_signed_cert()
if os.path.isfile(CERT_FILE):
cert = open(CERT_FILE, "r").readlines()
settings['sp']['x509cert'] = "".join(cert)
if os.path.isfile(KEY_FILE):
key = open(KEY_FILE, "r").readlines()
settings['sp']['privateKey'] = "".join(key)
settings['sp']['assertionConsumerService'] = {}
settings['sp']['assertionConsumerService'][
'binding'] = 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST'