Merge pull request #3175 from hosseinsh/dymanic-digicert-ICAs

Dynamic DigiCert Intermediate CA

lemur/common/utils.py

@@ -9,6 +9,7 @@
 import random
 import re
 import string
+import pem
 
 import sqlalchemy
 from cryptography import x509
@@ -16,7 +17,7 @@ from cryptography.exceptions import InvalidSignature, UnsupportedAlgorithm
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.asymmetric import rsa, ec, padding
-from cryptography.hazmat.primitives.serialization import load_pem_private_key
+from cryptography.hazmat.primitives.serialization import load_pem_private_key, Encoding, pkcs7
 from flask_restful.reqparse import RequestParser
 from sqlalchemy import and_, func
 
@@ -357,3 +358,19 @@ def find_matching_certificates_by_hash(cert, matching_certs):
         ):
             matching.append(c)
     return matching
+
+
+def convert_pkcs7_bytes_to_pem(certs_pkcs7):
+    """
+    Given a list of certificates in pkcs7 encoding (bytes), covert them into a list of PEM encoded files
+    :raises ValueError or ValidationError
+    :param certs_pkcs7:
+    :return: list of certs in PEM format
+    """
+
+    certificates = pkcs7.load_pem_pkcs7_certificates(certs_pkcs7)
+    certificates_pem = []
+    for cert in certificates:
+        certificates_pem.append(pem.parse(cert.public_bytes(encoding=Encoding.PEM))[0])
+
+    return certificates_pem

lemur/plugins/lemur_digicert/plugin.py

@@ -21,7 +21,7 @@ import requests
 import sys
 from cryptography import x509
 from flask import current_app, g
-from lemur.common.utils import validate_conf
+from lemur.common.utils import validate_conf, convert_pkcs7_bytes_to_pem
 from lemur.extensions import metrics
 from lemur.plugins import lemur_digicert as digicert
 from lemur.plugins.bases import IssuerPlugin, SourcePlugin
@@ -235,15 +235,18 @@ def get_certificate_id(session, base_url, order_id):
 
 @retry(stop_max_attempt_number=10, wait_fixed=10000)
 def get_cis_certificate(session, base_url, order_id):
-    """Retrieve certificate order id from Digicert API."""
+    """Retrieve certificate order id from Digicert API, including the chain"""
-    certificate_url = "{0}/platform/cis/certificate/{1}".format(base_url, order_id)
+    certificate_url = "{0}/platform/cis/certificate/{1}/download".format(base_url, order_id)
-    session.headers.update({"Accept": "application/x-pem-file"})
+    session.headers.update({"Accept": "application/x-pkcs7-certificates"})
     response = session.get(certificate_url)
 
     if response.status_code == 404:
         raise Exception("Order not in issued state.")
 
-    return response.content
+    cert_chain_pem = convert_pkcs7_bytes_to_pem(response.content)
+    if len(cert_chain_pem) < 3:
+        raise Exception("Missing the certificate chain")
+    return cert_chain_pem
 
 
 class DigiCertSourcePlugin(SourcePlugin):
@@ -447,7 +450,6 @@ class DigiCertCISSourcePlugin(SourcePlugin):
             "DIGICERT_CIS_API_KEY",
             "DIGICERT_CIS_URL",
             "DIGICERT_CIS_ROOTS",
-            "DIGICERT_CIS_INTERMEDIATES",
             "DIGICERT_CIS_PROFILE_NAMES",
         ]
         validate_conf(current_app, required_vars)
@@ -522,7 +524,6 @@ class DigiCertCISIssuerPlugin(IssuerPlugin):
             "DIGICERT_CIS_API_KEY",
             "DIGICERT_CIS_URL",
             "DIGICERT_CIS_ROOTS",
-            "DIGICERT_CIS_INTERMEDIATES",
             "DIGICERT_CIS_PROFILE_NAMES",
         ]
 
@@ -552,22 +553,15 @@ class DigiCertCISIssuerPlugin(IssuerPlugin):
         data = handle_cis_response(response)
 
         # retrieve certificate
-        certificate_pem = get_cis_certificate(self.session, base_url, data["id"])
+        certificate_chain_pem = get_cis_certificate(self.session, base_url, data["id"])
 
         self.session.headers.pop("Accept")
-        end_entity = pem.parse(certificate_pem)[0]
+        end_entity = certificate_chain_pem[0]
+        intermediate = certificate_chain_pem[1]
 
-        if "ECC" in issuer_options["key_type"]:
         return (
             "\n".join(str(end_entity).splitlines()),
-                current_app.config.get("DIGICERT_ECC_CIS_INTERMEDIATES", {}).get(issuer_options['authority'].name),
+            "\n".join(str(intermediate).splitlines()),
-                data["id"],
-            )
-
-        # By default return RSA
-        return (
-            "\n".join(str(end_entity).splitlines()),
-            current_app.config.get("DIGICERT_CIS_INTERMEDIATES", {}).get(issuer_options['authority'].name),
             data["id"],
         )
 

lemur/tests/conf.py

@@ -99,7 +99,6 @@ DIGICERT_CIS_URL = "mock://www.digicert.com"
 DIGICERT_CIS_PROFILE_NAMES = {"sha2-rsa-ecc-root": "ssl_plus"}
 DIGICERT_CIS_API_KEY = "api-key"
 DIGICERT_CIS_ROOTS = {"root": "ROOT"}
-DIGICERT_CIS_INTERMEDIATES = {"inter": "INTERMEDIATE_CA_CERT"}
 
 VERISIGN_URL = "http://example.com"
 VERISIGN_PEM_PATH = "~/"

lemur/tests/test_utils.py

@@ -10,6 +10,7 @@ from lemur.tests.vectors import (
     ECDSA_SECP384r1_CERT,
     ECDSA_SECP384r1_CERT_STR,
     DSA_CERT,
+    CERT_CHAIN_PKCS7_PEM
 )
 
 
@@ -114,3 +115,16 @@ def test_get_key_type_from_certificate():
     from lemur.common.utils import get_key_type_from_certificate
     assert (get_key_type_from_certificate(SAN_CERT_STR) == "RSA2048")
     assert (get_key_type_from_certificate(ECDSA_SECP384r1_CERT_STR) == "ECCSECP384R1")
+
+
+def test_convert_pkcs7_bytes_to_pem():
+    from lemur.common.utils import convert_pkcs7_bytes_to_pem
+    from lemur.common.utils import parse_certificate
+    cert_chain = convert_pkcs7_bytes_to_pem(CERT_CHAIN_PKCS7_PEM)
+    assert(len(cert_chain) == 3)
+
+    leaf = cert_chain[1]
+    root = cert_chain[2]
+
+    assert(parse_certificate("\n".join(str(root).splitlines())) == ROOTCA_CERT)
+    assert (parse_certificate("\n".join(str(leaf).splitlines())) == INTERMEDIATE_CERT)

lemur/tests/vectors.py

@@ -512,3 +512,78 @@ BglghkgBZQMEAwIDMAAwLQIVANubSNMSLt8plN9ZV3cp4pe3lMYCAhQPLLE7rTgm
 -----END CERTIFICATE-----
 """
 DSA_CERT = parse_certificate(DSA_CERT_STR)
+
+
+CERT_CHAIN_PKCS7_STR = """
+-----BEGIN PKCS7-----
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+-----END PKCS7-----
+"""
+
+CERT_CHAIN_PKCS7_PEM = CERT_CHAIN_PKCS7_STR.encode('utf-8')