581 lines
26 KiB
Python
581 lines
26 KiB
Python
# coding: utf-8
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import click
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import hashlib
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import logging
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import ipsecparse
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import json
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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 socket
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import subprocess
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import sys
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import requests
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from asn1crypto import pem, x509
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from asn1crypto.csr import CertificationRequest
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from certbuilder import CertificateBuilder, pem_armor_certificate
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from csrbuilder import CSRBuilder, pem_armor_csr
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from configparser import ConfigParser, NoOptionError
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from datetime import datetime, timedelta
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from email.utils import formatdate
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from oscrypto import asymmetric
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from pinecrypt.client import const
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def selinux_fixup(path):
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"""
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Fix OpenVPN credential store security context on Fedora
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"""
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if os.path.exists("/usr/bin/chcon") and os.path.exists("/sys/fs/selinux"):
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cmd = "chcon", "--type=home_cert_t", path
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subprocess.call(cmd)
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class ConfigTreeParser(ConfigParser):
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def __init__(self, path, *args, **kwargs):
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ConfigParser.__init__(self, *args, **kwargs)
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if os.path.exists(path):
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with open(path) as fh:
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click.echo("Parsing: %s" % fh.name)
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self.read_file(fh)
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if os.path.exists(path + ".d"):
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for filename in os.listdir(path + ".d"):
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if not filename.endswith(".conf"):
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continue
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with open(os.path.join(path + ".d", filename)) as fh:
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click.echo("Parsing: %s" % fh.name)
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self.read_file(fh)
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@click.command("provision", help="Add endpoint to Certidude client config")
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@click.argument("authority")
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@click.option("-m", "--method", help="Force connection method")
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def certidude_provision(authority, method):
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client_config = ConfigParser()
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try:
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os.makedirs(os.path.dirname(const.CLIENT_CONFIG_PATH))
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except FileExistsError:
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pass
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if os.path.exists(const.CLIENT_CONFIG_PATH):
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client_config.read_file(open(const.CLIENT_CONFIG_PATH))
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if client_config.has_section(authority):
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click.echo("Section '%s' already exists in %s, remove to regenerate" % (authority, const.CLIENT_CONFIG_PATH))
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else:
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click.echo("Section '%s' added to %s" % (authority, const.CLIENT_CONFIG_PATH))
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b = os.path.join(os.path.join(const.CONFIG_DIR, "authority", authority))
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client_config.add_section(authority)
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client_config.set(authority, "trigger", "interface up")
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client_config.set(authority, "common name", "$HOSTNAME")
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client_config.set(authority, "request path", os.path.join(b, "host_req.pem"))
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client_config.set(authority, "key path", os.path.join(b, "host_key.pem"))
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client_config.set(authority, "certificate path", os.path.join(b, "host_cert.pem"))
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client_config.set(authority, "authority path", os.path.join(b, "ca_cert.pem"))
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if method:
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client_config.set(authority, "method", method)
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with open(const.CLIENT_CONFIG_PATH + ".part", 'w') as fh:
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client_config.write(fh)
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os.rename(const.CLIENT_CONFIG_PATH + ".part", const.CLIENT_CONFIG_PATH)
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os.system("certidude enroll")
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@click.command("enroll", help="Run processes for requesting certificates and configuring services")
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@click.option("-k", "--kerberos", default=False, is_flag=True, help="Offer system keytab for auth")
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@click.option("-f", "--fork", default=False, is_flag=True, help="Fork to background")
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@click.option("-nw", "--no-wait", default=False, is_flag=True, help="Return immediately if server doesn't autosign")
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def certidude_enroll(fork, no_wait, kerberos):
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try:
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os.makedirs(const.RUN_DIR)
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except FileExistsError:
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pass
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if not os.path.exists(const.CLIENT_CONFIG_PATH):
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click.echo("Client not configured, so not going to enroll")
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return
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clients = ConfigTreeParser(const.CLIENT_CONFIG_PATH)
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for authority_name in clients.sections():
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try:
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trigger = clients.get(authority_name, "trigger")
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except NoOptionError:
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trigger = "interface up"
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if trigger == "domain joined":
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# Stop further processing if command line argument said so or trigger expects domain membership
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if not os.path.exists("/etc/krb5.keytab"):
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continue
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kerberos = True
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elif trigger == "interface up":
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pass
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else:
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raise
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#########################
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### Fork if requested ###
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#########################
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pid_path = os.path.join(const.RUN_DIR, authority_name + ".pid")
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try:
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with open(pid_path) as fh:
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pid = int(fh.readline())
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os.kill(pid, signal.SIGTERM)
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click.echo("Terminated process %d" % pid)
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os.unlink(pid_path)
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except EnvironmentError:
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pass
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if fork:
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child_pid = os.fork()
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else:
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child_pid = None
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if child_pid:
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click.echo("Spawned certificate request process with PID %d" % (child_pid))
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continue
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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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authority_path = clients.get(authority_name, "authority path")
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except NoOptionError:
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authority_path = "/etc/certidude/authority/%s/ca_cert.pem" % authority_name
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finally:
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if os.path.exists(authority_path):
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click.echo("Found authority certificate in: %s" % authority_path)
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with open(authority_path, "rb") as fh:
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header, _, certificate_der_bytes = pem.unarmor(fh.read())
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authority_certificate = x509.Certificate.load(certificate_der_bytes)
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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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headers={"Accept": "application/x-x509-ca-cert,application/x-pem-file"})
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header, _, certificate_der_bytes = pem.unarmor(r.content)
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authority_certificate = x509.Certificate.load(certificate_der_bytes)
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except requests.exceptions.ConnectionError:
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click.echo("Connection error while attempting to fetch %s" % authority_url)
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continue
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authority_partial = authority_path + ".part"
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with open(authority_partial, "wb") as oh:
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oh.write(r.content)
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click.echo("Writing authority certificate to: %s" % authority_path)
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selinux_fixup(authority_partial)
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os.rename(authority_partial, authority_path)
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authority_public_key = asymmetric.load_public_key(
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authority_certificate["tbs_certificate"]["subject_public_key_info"])
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try:
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config_path = clients.get(authority_name, "config path")
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except NoOptionError:
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config_path = "/etc/certidude/authority/%s/config.json" % authority_name
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finally:
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if os.path.exists(config_path):
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click.echo("Found config in: %s" % config_path)
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with open(config_path) as fh:
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bootstrap = json.loads(fh.read())
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else:
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bootstrap_url = "http://%s/api/bootstrap/" % authority_name
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click.echo("Attempting to bootstrap connection from %s" % bootstrap_url)
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try:
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r = requests.get(bootstrap_url)
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except requests.exceptions.ConnectionError:
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click.echo("Connection error while attempting to fetch %s" % bootstrap_url)
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continue
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else:
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if r.status_code != 200:
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raise ValueError("Bootstrap API endpoint returned %s" % r.content)
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bootstrap = r.json()
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config_partial = config_path + ".part"
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with open(config_partial, "wb") as oh:
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oh.write(r.content)
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click.echo("Writing configuration to: %s" % config_path)
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os.rename(config_partial, config_path)
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try:
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common_name = clients.get(authority_name, "common name")
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except NoOptionError:
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click.echo("No common name specified for %s, not requesting a certificate" % authority_name)
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continue
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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_COMMON_NAME, common_name):
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raise ValueError("Supplied common name %s doesn't match the expression %s" % (common_name, const.RE_COMMON_NAME))
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################################
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### Generate keypair and CSR ###
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################################
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try:
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key_path = clients.get(authority_name, "key path")
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request_path = clients.get(authority_name, "request path")
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except NoOptionError:
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key_path = "/etc/certidude/authority/%s/host_key.pem" % authority_name
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request_path = "/etc/certidude/authority/%s/host_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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if authority_public_key.algorithm == "ec":
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self_public_key, private_key = asymmetric.generate_pair("ec", curve=authority_public_key.curve)
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elif authority_public_key.algorithm == "rsa":
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self_public_key, private_key = asymmetric.generate_pair("rsa", bit_size=authority_public_key.bit_size)
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else:
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NotImplemented
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builder = CSRBuilder({"common_name": common_name}, self_public_key)
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request = builder.build(private_key)
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with open(key_partial, 'wb') as f:
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f.write(asymmetric.dump_private_key(private_key, None))
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with open(request_partial, 'wb') as f:
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f.write(pem_armor_csr(request))
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selinux_fixup(key_partial)
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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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##############################################
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### Submit CSR and save signed certificate ###
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##############################################
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try:
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certificate_path = clients.get(authority_name, "certificate path")
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except NoOptionError:
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certificate_path = "/etc/certidude/authority/%s/host_cert.pem" % authority_name
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try:
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autosign = clients.getboolean(authority_name, "autosign")
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except NoOptionError:
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autosign = True
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if not os.path.exists(certificate_path):
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# Set up URL-s
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request_params = set()
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request_params.add("autosign=%s" % ("yes" if autosign else "no"))
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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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"Date": formatdate(usegmt=True),
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}
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}
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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:8443/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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try:
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submission = requests.post(request_url, **kwargs)
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except requests.exceptions.ConnectionError:
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click.echo("Connection error while attempting to submit request to %s" % request_url)
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continue
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# Destroy service ticket
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if os.path.exists("/tmp/ca.ticket"):
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os.system("kdestroy")
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if submission.status_code == requests.codes.ok:
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pass
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if submission.status_code == requests.codes.accepted:
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click.echo("Server accepted the request, but refused to sign immediately (%s). Waiting was not requested, hence quitting for now" % submission.text)
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os.unlink(pid_path)
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continue
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if submission.status_code == requests.codes.conflict:
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raise errors.DuplicateCommonNameError("Different signing request with same CN is already present on server, server refuses to overwrite")
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elif submission.status_code == requests.codes.gone:
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# Should the client retry or disable request submission?
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raise ValueError("Server refused to sign the request") # TODO: Raise proper exception
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elif submission.status_code == requests.codes.bad_request:
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raise ValueError("Server said following, likely current certificate expired/revoked? %s" % submission.text)
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else:
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submission.raise_for_status()
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try:
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header, _, certificate_der_bytes = pem.unarmor(submission.content)
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cert = x509.Certificate.load(certificate_der_bytes)
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except: # TODO: catch correct exceptions
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raise ValueError("Failed to parse PEM: %s" % submission.text)
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assert cert.subject.native["common_name"] == common_name, \
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"Expected certificate with common name %s, but got %s instead" % \
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(common_name, cert.subject.native["common_name"])
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os.umask(0o022)
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certificate_partial = certificate_path + ".part"
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with open(certificate_partial, "w") as fh:
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# Dump certificate
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fh.write(submission.text)
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click.echo("Writing certificate to: %s" % certificate_path)
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selinux_fixup(certificate_partial)
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os.rename(certificate_partial, certificate_path)
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else:
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click.echo("Certificate found at %s and no renewal requested" % certificate_path)
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##################################
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### Configure related services ###
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##################################
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endpoint = authority_name
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try:
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method = clients.get(authority_name, "method")
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except NoOptionError:
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method = "init/openvpn"
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click.echo("Configuring '%s'" % endpoint)
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csummer = hashlib.sha1()
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csummer.update(endpoint.encode("ascii"))
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csum = csummer.hexdigest()
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uuid = csum[:8] + "-" + csum[8:12] + "-" + csum[12:16] + "-" + csum[16:20] + "-" + csum[20:32]
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# OpenVPN set up with initscripts
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if method == "init/openvpn":
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openvpn_config_path = "/etc/openvpn/%s.conf" % endpoint
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with open(openvpn_config_path + ".part", "w") as fh:
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fh.write("client\n")
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fh.write("nobind\n")
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fh.write("remote %s 1194 udp\n" % endpoint)
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fh.write("remote %s 443 tcp\n" % endpoint)
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fh.write("tls-version-min %s\n" % bootstrap["openvpn"]["tls_version_min"])
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if bootstrap["openvpn"]["tls_version_min"] == "1.3":
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fh.write("tls-ciphersuites %s\n" % bootstrap["openvpn"]["tls_ciphersuites"])
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elif bootstrap["openvpn"]["tls_version_min"] == "1.2":
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fh.write("tls-cipher %s\n" % bootstrap["openvpn"]["tls_cipher"])
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else:
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raise NotImplementedError("Unsupported TLS version")
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fh.write("ncp-disable\n")
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fh.write("cipher %s\n" % bootstrap["openvpn"]["cipher"])
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fh.write("auth %s\n" % bootstrap["openvpn"]["auth"])
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fh.write("mute-replay-warnings\n")
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fh.write("reneg-sec 0\n")
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fh.write("remote-cert-tls server\n")
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fh.write("dev tun\n")
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fh.write("persist-tun\n")
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fh.write("persist-key\n")
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fh.write("ca %s\n" % authority_path)
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fh.write("key %s\n" % key_path)
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fh.write("cert %s\n" % certificate_path)
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os.rename(openvpn_config_path + ".part", openvpn_config_path)
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if os.path.exists("/bin/systemctl"):
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click.echo("Re-running systemd generators for OpenVPN...")
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os.system("systemctl daemon-reload")
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# if not os.path.exists("/etc/systemd/system/openvpn-reconnect.service"):
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# with open("/etc/systemd/system/openvpn-reconnect.service.part", "w") as fh:
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# fh.write(env.get_template("client/openvpn-reconnect.service").render(context))
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# os.rename("/etc/systemd/system/openvpn-reconnect.service.part",
|
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# "/etc/systemd/system/openvpn-reconnect.service")
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# click.echo("Created /etc/systemd/system/openvpn-reconnect.service")
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os.system("systemctl restart openvpn")
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continue
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|
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# IPSec set up with initscripts
|
|
if method == "init/strongswan":
|
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strongswan_config_path = os.path.join(const.STRONGSWAN_PREFIX, "ipsec.conf")
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strongswan_secrets_path = os.path.join(const.STRONGSWAN_PREFIX, "ipsec.secrets")
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with open(strongswan_config_path) as fh:
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config = ipsecparse.loads(fh.read())
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config["ca", endpoint] = {}
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config["ca", endpoint]["cacert"] = authority_path
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config["ca", endpoint]["auto"] = "add"
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config["conn", endpoint] = {}
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config["conn", endpoint]["auto"] = "start"
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config["conn", endpoint]["right"] = endpoint
|
|
config["conn", endpoint]["keyingtries"] = "%forever"
|
|
config["conn", endpoint]["dpdaction"] = "restart"
|
|
config["conn", endpoint]["closeaction"] = "restart"
|
|
config["conn", endpoint]["rightsubnet"] = "0.0.0.0/0"
|
|
config["conn", endpoint]["ike"] = "%s!" % bootstrap["strongswan"]["ike"]
|
|
config["conn", endpoint]["esp"] = "%s!" % bootstrap["strongswan"]["esp"]
|
|
config["conn", endpoint]["leftsourceip"] = "%config"
|
|
config["conn", endpoint]["leftcert"] = certificate_path
|
|
# leftca="$AUTHORITY_CERTIFICATE_DISTINGUISHED_NAME"
|
|
# rightca="$AUTHORITY_CERTIFICATE_DISTINGUISHED_NAME"
|
|
|
|
|
|
with open(strongswan_secrets_path + ".part", "w") as fh:
|
|
fh.write(": %s %s\n" % (
|
|
"ECDSA" if authority_public_key.algorithm == "ec" else "RSA",
|
|
key_path
|
|
))
|
|
|
|
with open(strongswan_config_path + ".part", "w") as fh:
|
|
fh.write(config.dumps())
|
|
os.rename(strongswan_secrets_path + ".part", strongswan_secrets_path)
|
|
os.rename(strongswan_config_path + ".part", strongswan_config_path)
|
|
|
|
# Tune AppArmor profile, TODO: retain contents
|
|
if os.path.exists("/etc/apparmor.d/local"):
|
|
with open("/etc/apparmor.d/local/usr.lib.ipsec.charon", "w") as fh:
|
|
fh.write(key_path + " r,\n")
|
|
fh.write(authority_path + " r,\n")
|
|
fh.write(certificate_path + " r,\n")
|
|
|
|
# Attempt to reload config or start if it's not running
|
|
if os.path.exists("/usr/sbin/strongswan"): # wtf fedora
|
|
if os.system("strongswan update"):
|
|
os.system("strongswan start")
|
|
else:
|
|
if os.system("ipsec update"):
|
|
os.system("ipsec start")
|
|
|
|
continue
|
|
|
|
# OpenVPN set up with NetworkManager
|
|
if method == "network-manager/openvpn":
|
|
# NetworkManager-strongswan-gnome
|
|
nm_config_path = os.path.join("/etc/NetworkManager/system-connections", endpoint)
|
|
if os.path.exists(nm_config_path):
|
|
click.echo("Not creating %s, remove to regenerate" % nm_config_path)
|
|
continue
|
|
nm_config = ConfigParser()
|
|
nm_config.add_section("connection")
|
|
nm_config.set("connection", "certidude managed", "true")
|
|
nm_config.set("connection", "id", endpoint)
|
|
nm_config.set("connection", "uuid", uuid)
|
|
nm_config.set("connection", "type", "vpn")
|
|
nm_config.add_section("vpn")
|
|
nm_config.set("vpn", "service-type", "org.freedesktop.NetworkManager.openvpn")
|
|
nm_config.set("vpn", "connection-type", "tls")
|
|
nm_config.set("vpn", "comp-lzo", "no")
|
|
nm_config.set("vpn", "cert-pass-flags", "0")
|
|
nm_config.set("vpn", "tap-dev", "no")
|
|
nm_config.set("vpn", "remote-cert-tls", "server") # Assert TLS Server flag of X.509 certificate
|
|
nm_config.set("vpn", "remote", endpoint)
|
|
nm_config.set("vpn", "key", key_path)
|
|
nm_config.set("vpn", "cert", certificate_path)
|
|
nm_config.set("vpn", "ca", authority_path)
|
|
nm_config.set("vpn", "tls-cipher", bootstrap["openvpn"]["tls_cipher"])
|
|
nm_config.set("vpn", "cipher", bootstrap["openvpn"]["cipher"])
|
|
nm_config.set("vpn", "auth", bootstrap["openvpn"]["auth"])
|
|
nm_config.add_section("ipv4")
|
|
nm_config.set("ipv4", "method", "auto")
|
|
nm_config.set("ipv4", "never-default", "true")
|
|
nm_config.add_section("ipv6")
|
|
nm_config.set("ipv6", "method", "auto")
|
|
nm_config.set("vpn", "port", "443")
|
|
nm_config.set("vpn", "proto-tcp", "yes")
|
|
|
|
# Prevent creation of files with liberal permissions
|
|
os.umask(0o177)
|
|
|
|
# Write NetworkManager configuration
|
|
with open(nm_config_path, "w") as fh:
|
|
nm_config.write(fh)
|
|
click.echo("Created %s" % nm_config_path)
|
|
if os.path.exists("/run/NetworkManager"):
|
|
os.system("nmcli con reload")
|
|
os.system("nmcli con up %s" % uuid)
|
|
continue
|
|
|
|
|
|
# IPSec set up with NetworkManager
|
|
if method == "network-manager/strongswan":
|
|
client_config = ConfigParser()
|
|
nm_config = ConfigParser()
|
|
nm_config.add_section("connection")
|
|
nm_config.set("connection", "certidude managed", "true")
|
|
nm_config.set("connection", "id", endpoint)
|
|
nm_config.set("connection", "uuid", uuid)
|
|
nm_config.set("connection", "type", "vpn")
|
|
nm_config.add_section("vpn")
|
|
nm_config.set("vpn", "service-type", "org.freedesktop.NetworkManager.strongswan")
|
|
nm_config.set("vpn", "encap", "no")
|
|
nm_config.set("vpn", "virtual", "yes")
|
|
nm_config.set("vpn", "method", "key")
|
|
nm_config.set("vpn", "ipcomp", "no")
|
|
nm_config.set("vpn", "address", endpoint)
|
|
nm_config.set("vpn", "userkey", key_path)
|
|
nm_config.set("vpn", "usercert", certificate_path)
|
|
nm_config.set("vpn", "certificate", authority_path)
|
|
nm_config.set("vpn", "ike", bootstrap["strongswan"]["ike"])
|
|
nm_config.set("vpn", "esp", bootstrap["strongswan"]["esp"])
|
|
nm_config.set("vpn", "proposal", "yes")
|
|
|
|
nm_config.add_section("ipv4")
|
|
nm_config.set("ipv4", "method", "auto")
|
|
|
|
# Prevent creation of files with liberal permissions
|
|
os.umask(0o177)
|
|
|
|
# Write NetworkManager configuration
|
|
with open(os.path.join("/etc/NetworkManager/system-connections", endpoint), "w") as fh:
|
|
nm_config.write(fh)
|
|
click.echo("Created %s" % fh.name)
|
|
if os.path.exists("/run/NetworkManager"):
|
|
os.system("nmcli con reload")
|
|
os.system("nmcli con up %s" % uuid)
|
|
continue
|
|
|
|
click.echo("Unknown service: %s" % service_config.get(endpoint, "service"))
|
|
os.unlink(pid_path)
|
|
|
|
|
|
@click.group()
|
|
def entry_point(): pass
|
|
|
|
|
|
entry_point.add_command(certidude_enroll)
|
|
entry_point.add_command(certidude_provision)
|
|
|
|
if __name__ == "__main__":
|
|
entry_point()
|