# xxx To-do:
# - Doesn't actually check that Interface is connected to bridge
-# - Doesn't support cert authentication
+# - If a certificate is badly formed, Racoon will refuse to start. We
+# should do a better job of verifying certificates are valid before
+# adding an interface to racoon.conf.
import getopt
+import glob
import logging, logging.handlers
import os
-import stat
import subprocess
import sys
class Racoon:
# Default locations for files
conf_file = "/etc/racoon/racoon.conf"
- cert_file = "/etc/racoon/certs"
+ cert_dir = "/etc/racoon/certs"
psk_file = "/etc/racoon/psk.txt"
- # Default racoon configuration file we use for IKE
- conf_template = """# Configuration file generated by Open vSwitch
+ # Racoon configuration header we use for IKE
+ conf_header = """# Configuration file generated by Open vSwitch
#
# Do not modify by hand!
-path pre_shared_key "/etc/racoon/psk.txt";
-path certificate "/etc/racoon/certs";
+path pre_shared_key "%s";
+path certificate "%s";
-remote anonymous {
+"""
+
+ # Racoon configuration footer we use for IKE
+ conf_footer = """sainfo anonymous {
+ pfs_group 2;
+ lifetime time 1 hour;
+ encryption_algorithm aes;
+ authentication_algorithm hmac_sha1, hmac_md5;
+ compression_algorithm deflate;
+}
+
+"""
+
+ # Certificate entry template.
+ cert_entry = """remote %s {
exchange_mode main;
nat_traversal on;
+ certificate_type x509 "%s" "%s";
+ my_identifier asn1dn;
+ peers_identifier asn1dn;
+ peers_certfile x509 "%s";
+ verify_identifier on;
proposal {
encryption_algorithm aes;
hash_algorithm sha1;
- authentication_method pre_shared_key;
+ authentication_method rsasig;
dh_group 2;
}
}
-sainfo anonymous {
- pfs_group 2;
- lifetime time 1 hour;
- encryption_algorithm aes;
- authentication_algorithm hmac_sha1, hmac_md5;
- compression_algorithm deflate;
+"""
+
+ # Pre-shared key template.
+ psk_entry = """remote %s {
+ exchange_mode main;
+ nat_traversal on;
+ proposal {
+ encryption_algorithm aes;
+ hash_algorithm sha1;
+ authentication_method pre_shared_key;
+ dh_group 2;
+ }
}
+
"""
def __init__(self):
self.psk_hosts = {}
self.cert_hosts = {}
- # Replace racoon's conf file with our template
- f = open(Racoon.conf_file, "w")
- f.write(Racoon.conf_template)
- f.close()
+ # Clean out stale peer certs from previous runs
+ for ovs_cert in glob.glob("%s/ovs-*.pem" % self.cert_dir):
+ try:
+ os.remove(ovs_cert)
+ except OSError:
+ s_log.warning("couldn't remove %s" % ovs_cert)
- # Clear out any pre-shared keys
- self.commit_psk()
-
- self.reload()
+ # Replace racoon's conf file with our template
+ self.commit()
def reload(self):
exitcode = subprocess.call(["/etc/init.d/racoon", "reload"])
if exitcode != 0:
- s_log.warning("couldn't reload racoon")
+ # Racoon is finicky about it's configuration file and will
+ # refuse to start if it sees something it doesn't like
+ # (e.g., a certificate file doesn't exist). Try restarting
+ # the process before giving up.
+ s_log.warning("attempting to restart racoon")
+ exitcode = subprocess.call(["/etc/init.d/racoon", "restart"])
+ if exitcode != 0:
+ s_log.warning("couldn't reload racoon")
+
+ def commit(self):
+ # Rewrite the Racoon configuration file
+ conf_file = open(self.conf_file, 'w')
+ conf_file.write(Racoon.conf_header % (self.psk_file, self.cert_dir))
+
+ for host, vals in self.cert_hosts.iteritems():
+ conf_file.write(Racoon.cert_entry % (host, vals["certificate"],
+ vals["private_key"], vals["peer_cert_file"]))
+
+ for host in self.psk_hosts:
+ conf_file.write(Racoon.psk_entry % host)
+
+ conf_file.write(Racoon.conf_footer)
+ conf_file.close()
+
+ # Rewrite the pre-shared keys file; it must only be readable by root.
+ orig_umask = os.umask(0077)
+ psk_file = open(Racoon.psk_file, 'w')
+ os.umask(orig_umask)
+
+ psk_file.write("# Generated by Open vSwitch...do not modify by hand!")
+ psk_file.write("\n\n")
+ for host, vals in self.psk_hosts.iteritems():
+ psk_file.write("%s %s\n" % (host, vals["psk"]))
+ psk_file.close()
- def commit_psk(self):
- f = open(Racoon.psk_file, 'w')
-
- # The file must only be accessible by root
- os.chmod(Racoon.psk_file, stat.S_IRUSR | stat.S_IWUSR)
+ self.reload()
- f.write("# Generated by Open vSwitch...do not modify by hand!\n\n")
- for host, psk in self.psk_hosts.iteritems():
- f.write("%s %s\n" % (host, psk))
- f.close()
+ def _add_psk(self, host, psk):
+ if host in self.cert_hosts:
+ raise error.Error("host %s already defined for cert" % host)
- def add_psk(self, host, psk):
self.psk_hosts[host] = psk
- self.commit_psk()
-
- def del_psk(self, host):
+ self.commit()
+
+ def _verify_certs(self, vals):
+ # Racoon will refuse to start if the certificate files don't
+ # exist, so verify that they're there.
+ if not os.path.isfile(vals["certificate"]):
+ raise error.Error("'certificate' file does not exist: %s"
+ % vals["certificate"])
+ elif not os.path.isfile(vals["private_key"]):
+ raise error.Error("'private_key' file does not exist: %s"
+ % vals["private_key"])
+
+ # Racoon won't start if a given certificate or private key isn't
+ # valid. This is a weak test, but will detect the most flagrant
+ # errors.
+ if vals["peer_cert"].find("-----BEGIN CERTIFICATE-----") == -1:
+ raise error.Error("'peer_cert' is not in valid PEM format")
+
+ cert = open(vals["certificate"]).read()
+ if cert.find("-----BEGIN CERTIFICATE-----") == -1:
+ raise error.Error("'certificate' is not in valid PEM format")
+
+ cert = open(vals["private_key"]).read()
+ if cert.find("-----BEGIN RSA PRIVATE KEY-----") == -1:
+ raise error.Error("'private_key' is not in valid PEM format")
+
+
+ def _add_cert(self, host, vals):
if host in self.psk_hosts:
+ raise error.Error("host %s already defined for psk" % host)
+
+ if "certificate" not in vals:
+ raise error.Error("'certificate' not defined for %s" % host)
+ elif "private_key" not in vals:
+ # Assume the private key is stored in the same PEM file as
+ # the certificate. We make a copy of "vals" so that we don't
+ # modify the original "vals", which would cause the script
+ # to constantly think that the configuration has changed
+ # in the database.
+ vals = vals.copy()
+ vals["private_key"] = vals["certificate"]
+
+ self._verify_certs(vals)
+
+ # The peer's certificate comes to us in PEM format as a string.
+ # Write that string to a file for Racoon to use.
+ peer_cert_file = "%s/ovs-%s.pem" % (self.cert_dir, host)
+ f = open(peer_cert_file, "w")
+ f.write(vals["peer_cert"])
+ f.close()
+
+ vals["peer_cert_file"] = peer_cert_file
+
+ self.cert_hosts[host] = vals
+ self.commit()
+
+ def _del_cert(self, host):
+ peer_cert_file = self.cert_hosts[host]["peer_cert_file"]
+ del self.cert_hosts[host]
+ self.commit()
+ try:
+ os.remove(peer_cert_file)
+ except OSError:
+ pass
+
+ def add_entry(self, host, vals):
+ if vals["peer_cert"]:
+ self._add_cert(host, vals)
+ elif vals["psk"]:
+ self._add_psk(host, vals)
+
+ def del_entry(self, host):
+ if host in self.cert_hosts:
+ self._del_cert(host)
+ elif host in self.psk_hosts:
del self.psk_hosts[host]
- self.commit_psk()
+ self.commit()
# Class to configure IPsec on a system using racoon for IKE and setkey
self.sad_flush()
self.spd_flush()
self.racoon = Racoon()
+ self.entries = []
def call_setkey(self, cmds):
try:
self.call_setkey("spdflush;")
def spd_add(self, local_ip, remote_ip):
- cmds = ("spdadd %s %s gre -P out ipsec esp/transport//default;" %
+ cmds = ("spdadd %s %s gre -P out ipsec esp/transport//default;\n" %
(local_ip, remote_ip))
- cmds += "\n"
cmds += ("spdadd %s %s gre -P in ipsec esp/transport//default;" %
(remote_ip, local_ip))
self.call_setkey(cmds)
def spd_del(self, local_ip, remote_ip):
- cmds = "spddelete %s %s gre -P out;" % (local_ip, remote_ip)
- cmds += "\n"
+ cmds = "spddelete %s %s gre -P out;\n" % (local_ip, remote_ip)
cmds += "spddelete %s %s gre -P in;" % (remote_ip, local_ip)
self.call_setkey(cmds)
- def ipsec_cert_del(self, local_ip, remote_ip):
- # Need to support cert...right now only PSK supported
- self.racoon.del_psk(remote_ip)
- self.spd_del(local_ip, remote_ip)
- self.sad_del(local_ip, remote_ip)
+ def add_entry(self, local_ip, remote_ip, vals):
+ if remote_ip in self.entries:
+ raise error.Error("host %s already configured for ipsec"
+ % remote_ip)
- def ipsec_cert_update(self, local_ip, remote_ip, cert):
- # Need to support cert...right now only PSK supported
- self.racoon.add_psk(remote_ip, "abc12345")
+ self.racoon.add_entry(remote_ip, vals)
self.spd_add(local_ip, remote_ip)
- def ipsec_psk_del(self, local_ip, remote_ip):
- self.racoon.del_psk(remote_ip)
- self.spd_del(local_ip, remote_ip)
- self.sad_del(local_ip, remote_ip)
+ self.entries.append(remote_ip)
- def ipsec_psk_update(self, local_ip, remote_ip, psk):
- self.racoon.add_psk(remote_ip, psk)
- self.spd_add(local_ip, remote_ip)
+
+ def del_entry(self, local_ip, remote_ip):
+ if remote_ip in self.entries:
+ self.racoon.del_entry(remote_ip)
+ self.spd_del(local_ip, remote_ip)
+ self.sad_del(local_ip, remote_ip)
+
+ self.entries.remove(remote_ip)
def keep_table_columns(schema, table_name, column_types):
print " -h, --help display this help message"
sys.exit(0)
+def update_ipsec(ipsec, interfaces, new_interfaces):
+ for name, vals in interfaces.iteritems():
+ if name not in new_interfaces:
+ ipsec.del_entry(vals["local_ip"], vals["remote_ip"])
+
+ for name, vals in new_interfaces.iteritems():
+ orig_vals = interfaces.get(name)
+ if orig_vals:
+ # Configuration for this host already exists. Check if it's
+ # changed.
+ if vals == orig_vals:
+ continue
+ else:
+ ipsec.del_entry(vals["local_ip"], vals["remote_ip"])
+
+ try:
+ ipsec.add_entry(vals["local_ip"], vals["remote_ip"], vals)
+ except error.Error, msg:
+ s_log.warning("skipping ipsec config for %s: %s" % (name, msg))
+
def main(argv):
try:
options, args = getopt.gnu_getopt(
new_interfaces = {}
for rec in idl.data["Interface"].itervalues():
- name = rec.name.as_scalar()
- ipsec_cert = rec.options.get("ipsec_cert")
- ipsec_psk = rec.options.get("ipsec_psk")
- is_ipsec = ipsec_cert or ipsec_psk
-
if rec.type.as_scalar() == "ipsec_gre":
- if ipsec_cert or ipsec_psk:
- new_interfaces[name] = {
- "remote_ip": rec.options.get("remote_ip"),
- "local_ip": rec.options.get("local_ip", "0.0.0.0/0"),
- "ipsec_cert": ipsec_cert,
- "ipsec_psk": ipsec_psk }
- else:
- s_log.warning(
- "no ipsec_cert or ipsec_psk defined for %s" % name)
-
- if interfaces != new_interfaces:
- for name, vals in interfaces.items():
- if name not in new_interfaces.keys():
- ipsec.ipsec_cert_del(vals["local_ip"], vals["remote_ip"])
- for name, vals in new_interfaces.items():
- orig_vals = interfaces.get(name):
- if orig_vals:
- # Configuration for this host already exists. If
- # it has changed, this is an error.
- if vals != orig_vals:
- s_log.warning(
- "configuration changed for %s, need to delete "
- "interface first" % name)
- continue
+ name = rec.name.as_scalar()
+ peer_cert = rec.options.get("peer_cert")
+ psk = rec.options.get("psk")
- if vals["ipsec_cert"]:
- ipsec.ipsec_cert_update(vals["local_ip"],
- vals["remote_ip"], vals["ipsec_cert"])
- else:
- ipsec.ipsec_psk_update(vals["local_ip"],
- vals["remote_ip"], vals["ipsec_psk"])
+ if peer_cert and psk:
+ s_log.warning("both 'peer_cert' and 'psk' defined for %s"
+ % name)
+ continue
+ elif not peer_cert and not psk:
+ s_log.warning("no 'peer_cert' or 'psk' defined for %s"
+ % name)
+ continue
+ new_interfaces[name] = {
+ "remote_ip": rec.options.get("remote_ip"),
+ "local_ip": rec.options.get("local_ip", "0.0.0.0/0"),
+ "certificate": rec.options.get("certificate"),
+ "private_key": rec.options.get("private_key"),
+ "peer_cert": peer_cert,
+ "psk": psk }
+
+ if interfaces != new_interfaces:
+ update_ipsec(ipsec, interfaces, new_interfaces)
interfaces = new_interfaces
if __name__ == '__main__':
projects / openvswitch / commitdiff