mirror of
https://github.com/laurivosandi/certidude
synced 2024-12-22 16:25:17 +00:00
Migrate renewal to mutually authenticated TLS connection
This commit is contained in:
parent
1493c0f4a0
commit
b9aaec7fa6
@ -4,7 +4,7 @@ import logging
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import json
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import os
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import hashlib
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from asn1crypto import pem
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from asn1crypto import pem, x509
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from asn1crypto.csr import CertificationRequest
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from base64 import b64decode
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from certidude import config, push, errors
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@ -89,43 +89,29 @@ class RequestListResource(AuthorityHandler):
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cert_pk = cert["tbs_certificate"]["subject_public_key_info"].native
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csr_pk = csr["certification_request_info"]["subject_pk_info"].native
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if cert_pk == csr_pk: # Same public key, assume renewal
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expires = cert["tbs_certificate"]["validity"]["not_after"].native.replace(tzinfo=None)
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renewal_header = req.get_header("X-Renewal-Signature")
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try:
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buf = req.get_header("X-SSL-CERT")
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header, _, der_bytes = pem.unarmor(buf.replace("\t", "").encode("ascii"))
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handshake_cert = x509.Certificate.load(der_bytes)
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except:
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raise
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else:
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# Same public key
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if cert_pk == csr_pk:
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# Used mutually authenticated TLS handshake, assume renewal
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if handshake_cert.native == cert.native:
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for subnet in config.RENEWAL_SUBNETS:
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if req.context.get("remote_addr") in subnet:
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resp.set_header("Content-Type", "application/x-x509-user-cert")
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_, resp.body = self.authority._sign(csr, body, overwrite=True)
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logger.info("Renewing certificate for %s as %s is whitelisted", common_name, req.context.get("remote_addr"))
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return
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if not renewal_header:
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# No header supplied, redirect to signed API call
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resp.status = falcon.HTTP_SEE_OTHER
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resp.location = os.path.join(os.path.dirname(req.relative_uri), "signed", common_name)
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return
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try:
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renewal_signature = b64decode(renewal_header)
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except (TypeError, ValueError):
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logger.error("Renewal failed, bad signature supplied for %s", common_name)
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reasons.append("Renewal failed, bad signature supplied")
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else:
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try:
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asymmetric.rsa_pss_verify(
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asymmetric.load_certificate(cert),
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renewal_signature, buf + body, "sha512")
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except SignatureError:
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logger.error("Renewal failed, invalid signature supplied for %s", common_name)
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reasons.append("Renewal failed, invalid signature supplied")
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else:
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# At this point renewal signature was valid but we need to perform some extra checks
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if datetime.utcnow() > expires:
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logger.error("Renewal failed, current certificate for %s has expired", common_name)
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reasons.append("Renewal failed, current certificate expired")
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elif not config.CERTIFICATE_RENEWAL_ALLOWED:
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logger.error("Renewal requested for %s, but not allowed by authority settings", common_name)
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reasons.append("Renewal requested, but not allowed by authority settings")
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else:
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resp.set_header("Content-Type", "application/x-x509-user-cert")
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_, resp.body = self.authority._sign(csr, body, overwrite=True)
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logger.info("Renewed certificate for %s", common_name)
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return
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"""
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Process automatic signing if the IP address is whitelisted,
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@ -21,8 +21,6 @@ from xattr import getxattr, listxattr, setxattr
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random = SystemRandom()
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RE_HOSTNAME = "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])(@(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9]))?$"
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# https://securityblog.redhat.com/2014/06/18/openssl-privilege-separation-analysis/
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# https://jamielinux.com/docs/openssl-certificate-authority/
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# http://pycopia.googlecode.com/svn/trunk/net/pycopia/ssl/certs.py
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@ -84,7 +82,7 @@ def self_enroll():
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def get_request(common_name):
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if not re.match(RE_HOSTNAME, common_name):
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if not re.match(const.RE_HOSTNAME, common_name):
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raise ValueError("Invalid common name %s" % repr(common_name))
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path = os.path.join(config.REQUESTS_DIR, common_name + ".pem")
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try:
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@ -97,7 +95,7 @@ def get_request(common_name):
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raise errors.RequestDoesNotExist("Certificate signing request file %s does not exist" % path)
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def get_signed(common_name):
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if not re.match(RE_HOSTNAME, common_name):
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if not re.match(const.RE_HOSTNAME, common_name):
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raise ValueError("Invalid common name %s" % repr(common_name))
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path = os.path.join(config.SIGNED_DIR, common_name + ".pem")
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with open(path, "rb") as fh:
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@ -160,7 +158,7 @@ def store_request(buf, overwrite=False, address="", user=""):
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common_name = csr["certification_request_info"]["subject"].native["common_name"]
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if not re.match(RE_HOSTNAME, common_name):
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if not re.match(const.RE_HOSTNAME, common_name):
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raise ValueError("Invalid common name")
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request_path = os.path.join(config.REQUESTS_DIR, common_name + ".pem")
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@ -298,7 +296,7 @@ def export_crl(pem=True):
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def delete_request(common_name):
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# Validate CN
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if not re.match(RE_HOSTNAME, common_name):
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if not re.match(const.RE_HOSTNAME, common_name):
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raise ValueError("Invalid common name")
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path, buf, csr, submitted = get_request(common_name)
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126
certidude/cli.py
126
certidude/cli.py
@ -5,11 +5,13 @@ import hashlib
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import logging
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import os
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import random
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import re
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import signal
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import string
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import subprocess
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import sys
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from asn1crypto import pem, x509
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from asn1crypto.csr import CertificationRequest
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from base64 import b64encode
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from certbuilder import CertificateBuilder, pem_armor_certificate
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from certidude import const
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@ -177,17 +179,6 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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with open(pid_path, "w") as fh:
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fh.write("%d\n" % os.getpid())
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try:
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scheme = "http" if clients.getboolean(authority_name, "insecure") else "https"
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except NoOptionError:
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scheme = "https"
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# Expand ca.example.com
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authority_url = "%s://%s/api/certificate/" % (scheme, authority_name)
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request_url = "%s://%s/api/request/" % (scheme, authority_name)
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revoked_url = "%s://%s/api/revoked/" % (scheme, authority_name)
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try:
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authority_path = clients.get(authority_name, "authority path")
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except NoOptionError:
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@ -201,6 +192,7 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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else:
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if not os.path.exists(os.path.dirname(authority_path)):
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os.makedirs(os.path.dirname(authority_path))
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authority_url = "http://%s/api/certificate/" % authority_name
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click.echo("Attempting to fetch authority certificate from %s" % authority_url)
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try:
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r = requests.get(authority_url,
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@ -260,15 +252,21 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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revocations_path = None
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else:
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# Fetch certificate revocation list
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revoked_url = "http://%s/api/revoked/" % authority_name
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click.echo("Fetching CRL from %s to %s" % (revoked_url, revocations_path))
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r = requests.get(revoked_url, headers={'accept': 'application/x-pem-file'})
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assert r.status_code == 200, "Failed to fetch CRL from %s, got %s" % (revoked_url, r.text)
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#revocations = crl.CertificateList.load(pem.unarmor(r.content))
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# TODO: check signature, parse reasons, remove keys if revoked
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revocations_partial = revocations_path + ".part"
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with open(revocations_partial, 'wb') as f:
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f.write(r.content)
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if r.status_code == 200:
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revocations = crl.CertificateList.load(pem.unarmor(r.content))
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# TODO: check signature, parse reasons, remove keys if revoked
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revocations_partial = revocations_path + ".part"
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with open(revocations_partial, 'wb') as f:
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f.write(r.content)
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elif r.status_code == 404:
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click.echo("CRL disabled, server said 404")
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else:
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click.echo("Failed to fetch CRL from %s, got %s" % (revoked_url, r.text))
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try:
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common_name = clients.get(authority_name, "common name")
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@ -279,6 +277,13 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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# If deriving common name from *current* hostname is preferred
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if common_name == "$HOSTNAME":
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common_name = const.HOSTNAME
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elif common_name == "$FQDN":
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common_name = const.FQDN
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elif "$" in common_name:
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raise ValueError("Invalid variable '%s' supplied, only $HOSTNAME and $FQDN allowed" % common_name)
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if not re.match(const.RE_HOSTNAME, common_name):
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raise ValueError("Invalid common name '%s' supplied" % common_name)
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################################
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### Generate keypair and CSR ###
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@ -291,6 +296,14 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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key_path = "/var/lib/certidude/%s/client_key.pem" % authority_name
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request_path = "/var/lib/certidude/%s/client_csr.pem" % authority_name
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if os.path.exists(request_path):
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with open(request_path, "rb") as fh:
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header, _, der_bytes = pem.unarmor(fh.read())
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csr = CertificationRequest.load(der_bytes)
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if csr["certification_request_info"]["subject"].native["common_name"] != common_name:
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click.echo("Stored request's common name differs from currently requested one, deleting old request")
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os.remove(request_path)
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if not os.path.exists(request_path):
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key_partial = key_path + ".part"
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request_partial = request_path + ".part"
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@ -312,7 +325,7 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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selinux_fixup(request_partial)
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os.rename(key_partial, key_path)
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os.rename(request_partial, request_path)
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# else: check that CSR has correct CN
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##############################################
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### Submit CSR and save signed certificate ###
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@ -323,14 +336,7 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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except NoOptionError:
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certificate_path = "/var/lib/certidude/%s/client_cert.pem" % authority_name
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headers={
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"Content-Type": "application/pkcs10",
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"Accept": "application/x-x509-user-cert,application/x-pem-file"
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}
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try:
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# Attach renewal signature if renewal requested and cert exists
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renewal_overlap = clients.getint(authority_name, "renewal overlap")
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except NoOptionError: # Renewal not specified in config
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renewal_overlap = None
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@ -343,15 +349,8 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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if renewal_overlap and NOW > expires - timedelta(days=renewal_overlap):
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click.echo("Certificate will expire %s, will attempt to renew" % expires)
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renew = True
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headers["X-Renewal-Signature"] = b64encode(
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asymmetric.rsa_pss_sign(
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asymmetric.load_private_key(kh.read()),
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cert_buf + rh.read(),
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"sha384"))
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except EnvironmentError: # Certificate missing, can't renew
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pass
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else:
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click.echo("Attached renewal signature %s" % headers["X-Renewal-Signature"])
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if not os.path.exists(certificate_path) or renew:
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# Set up URL-s
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@ -359,31 +358,48 @@ def certidude_enroll(fork, renew, no_wait, kerberos, skip_self):
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request_params.add("autosign=true")
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if not no_wait:
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request_params.add("wait=forever")
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kwargs = {
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"data": open(request_path),
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"verify": authority_path,
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"headers": {
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"Content-Type": "application/pkcs10",
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"Accept": "application/x-x509-user-cert,application/x-pem-file"
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}
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}
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if renew: # Do mutually authenticated TLS handshake
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request_url = "https://%s:8443/api/request/" % authority_name
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kwargs["cert"] = certificate_path, key_path
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else:
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# If machine is joined to domain attempt to present machine credentials for authentication
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if kerberos:
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try:
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from requests_kerberos import HTTPKerberosAuth, OPTIONAL
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except ImportError:
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click.echo("Kerberos bindings not available, please install requests-kerberos")
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else:
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os.environ["KRB5CCNAME"]="/tmp/ca.ticket"
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# Mac OS X has keytab with lowercase hostname
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cmd = "kinit -S HTTP/%s -k %s$" % (authority_name, const.HOSTNAME.lower())
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click.echo("Executing: %s" % cmd)
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if os.system(cmd):
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# Fedora /w SSSD has keytab with uppercase hostname
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cmd = "kinit -S HTTP/%s -k %s$" % (authority_name, const.HOSTNAME.upper())
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if os.system(cmd):
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# Failed, probably /etc/krb5.keytab contains spaghetti
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raise ValueError("Failed to initialize Kerberos service ticket using machine keytab")
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assert os.path.exists("/tmp/ca.ticket"), "Ticket not created!"
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click.echo("Initialized Kerberos service ticket using machine keytab")
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kwargs["auth"] = HTTPKerberosAuth(mutual_authentication=OPTIONAL, force_preemptive=True)
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else:
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click.echo("Not using machine keytab")
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request_url = "https://%s/api/request/" % authority_name
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if request_params:
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request_url = request_url + "?" + "&".join(request_params)
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# If machine is joined to domain attempt to present machine credentials for authentication
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if kerberos:
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os.environ["KRB5CCNAME"]="/tmp/ca.ticket"
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# Mac OS X has keytab with lowercase hostname
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cmd = "kinit -S HTTP/%s -k %s$" % (authority_name, const.HOSTNAME.lower())
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click.echo("Executing: %s" % cmd)
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if os.system(cmd):
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# Fedora /w SSSD has keytab with uppercase hostname
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cmd = "kinit -S HTTP/%s -k %s$" % (authority_name, const.HOSTNAME.upper())
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if os.system(cmd):
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# Failed, probably /etc/krb5.keytab contains spaghetti
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raise ValueError("Failed to initialize TGT using machine keytab")
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assert os.path.exists("/tmp/ca.ticket"), "Ticket not created!"
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click.echo("Initialized Kerberos TGT using machine keytab")
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from requests_kerberos import HTTPKerberosAuth, OPTIONAL
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auth = HTTPKerberosAuth(mutual_authentication=OPTIONAL, force_preemptive=True)
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else:
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click.echo("Not using machine keytab")
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auth = None
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submission = requests.post(request_url, auth=auth, data=open(request_path), headers=headers)
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submission = requests.post(request_url, **kwargs)
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# Destroy service ticket
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if os.path.exists("/tmp/ca.ticket"):
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@ -35,6 +35,8 @@ OCSP_SUBNETS = set([ipaddress.ip_network(j) for j in
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cp.get("authorization", "ocsp subnets").split(" ") if j])
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CRL_SUBNETS = set([ipaddress.ip_network(j) for j in
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cp.get("authorization", "crl subnets").split(" ") if j])
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RENEWAL_SUBNETS = set([ipaddress.ip_network(j) for j in
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cp.get("authorization", "renewal subnets").split(" ") if j])
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AUTHORITY_DIR = "/var/lib/certidude"
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AUTHORITY_PRIVATE_KEY_PATH = cp.get("authority", "private key path")
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@ -64,7 +66,6 @@ REQUEST_SUBMISSION_ALLOWED = cp.getboolean("authority", "request submission allo
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AUTHORITY_CERTIFICATE_URL = cp.get("signature", "authority certificate url")
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AUTHORITY_CRL_URL = cp.get("signature", "revoked url")
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AUTHORITY_OCSP_URL = cp.get("signature", "responder url")
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CERTIFICATE_RENEWAL_ALLOWED = cp.getboolean("signature", "renewal allowed")
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REVOCATION_LIST_LIFETIME = cp.getint("signature", "revocation list lifetime")
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@ -6,6 +6,7 @@ import sys
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KEY_SIZE = 1024 if os.getenv("TRAVIS") else 4096
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CURVE_NAME = "secp384r1"
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RE_HOSTNAME = "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])(@(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9]))?$"
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RUN_DIR = "/run/certidude"
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CONFIG_DIR = "/etc/certidude"
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@ -119,14 +119,21 @@ server {
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nchan_channel_id $1;
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nchan_subscriber eventsource;
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}
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# Long poll for CSR submission
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location ~ "^/lp/sub/(.*)" {
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nchan_channel_id $1;
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nchan_subscriber longpoll;
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}
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{% endif %}
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}
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server {
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# Section for certificate authenticated HTTPS clients,
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# for submitting information to CA eg. leases
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# and for delivering scripts to clients
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# for submitting information to CA eg. leases,
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# renewing certificates and
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# for delivering scripts to clients
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server_name {{ common_name }};
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listen 8443 ssl http2;
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@ -70,6 +70,12 @@ ocsp subnets =
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;crl subnets =
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crl subnets = 0.0.0.0/0
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|
||||
# If certificate renewal is attempted from whitelisted subnets, clients can
|
||||
# request a certificate for the same public key with extended lifetime.
|
||||
# To disable set to none
|
||||
renewal subnets =
|
||||
;renewal subnets = 0.0.0.0/0
|
||||
|
||||
[logging]
|
||||
# Disable logging
|
||||
;backend =
|
||||
@ -107,11 +113,6 @@ revoked url = {{ revoked_url }}
|
||||
responder url =
|
||||
;responder url = {{ responder_url }}
|
||||
|
||||
# If certificate renewal is allowed clients can request a certificate
|
||||
# for the same public key with extended lifetime
|
||||
renewal allowed = false
|
||||
;renewal allowed = true
|
||||
|
||||
|
||||
[push]
|
||||
# This should occasionally be regenerated
|
||||
|
||||
Loading…
Reference in New Issue
Block a user