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freeipa/ipaserver/install/certs.py

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# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os, stat, subprocess, re
import sys
import tempfile
import shutil
from ipapython.ipa_log_manager import *
import xml.dom.minidom
import pwd
import fcntl
import base64
from hashlib import sha1
from ConfigParser import RawConfigParser, MissingSectionHeaderError
from nss import nss
from ipapython import dogtag
from ipapython import sysrestore
from ipapython import ipautil
from ipapython import certmonger
from ipapython.certdb import get_ca_nickname
from ipapython import services as ipaservices
from ipapython.dn import DN
from ipalib import pkcs10, x509, api
from ipalib.errors import CertificateOperationError
from ipalib.text import _
# Apache needs access to this database so we need to create it
# where apache can reach
NSS_DIR = "/etc/httpd/alias"
CA_SERIALNO="/var/lib/ipa/ca_serialno"
def ipa_self_signed():
"""
Determine if the current IPA CA is self-signed or using another CA
We do this based on the CA plugin that is currently in use.
"""
if api.env.ra_plugin == 'selfsign':
return True
else:
return False
def ipa_self_signed_master():
"""
The selfsign backend is enabled only one a single master.
Return True/False whether this is that master.
Returns None if not a self-signed server.
"""
if ipa_self_signed():
return api.env.enable_ra
else:
return None
def find_cert_from_txt(cert, start=0):
"""
Given a cert blob (str) which may or may not contian leading and
trailing text, pull out just the certificate part. This will return
the FIRST cert in a stream of data.
Returns a tuple (certificate, last position in cert)
"""
s = cert.find('-----BEGIN CERTIFICATE-----', start)
e = cert.find('-----END CERTIFICATE-----', s)
if e > 0: e = e + 25
if s < 0 or e < 0:
raise RuntimeError("Unable to find certificate")
cert = cert[s:e]
return (cert, e)
def get_cert_nickname(cert):
"""
Using the subject from cert come up with a nickname suitable
for NSS. The caller can decide whether to use just the RDN
or the whole subject.
Returns a tuple of (rdn, subject_dn) when rdn is the string
representation of the first RDN in the subject and subject_dn
is a DN object.
"""
nsscert = x509.load_certificate(cert)
subject = str(nsscert.subject)
dn = DN(subject)
return (str(dn[0]), dn)
def next_serial(serial_file=CA_SERIALNO):
"""
Get the next serial number if we're using an NSS-based self-signed CA.
The file is an ini-like file with following properties:
lastvalue = the last serial number handed out
nextreplica = the serial number the next replica should start with
replicainterval = the number to add to nextreplica the next time a
replica is created
File locking is attempted so we have unique serial numbers.
"""
fp = None
parser = RawConfigParser()
if ipautil.file_exists(serial_file):
try:
fp = open(serial_file, "r+")
fcntl.flock(fp.fileno(), fcntl.LOCK_EX)
parser.readfp(fp)
serial = parser.getint('selfsign', 'lastvalue')
cur_serial = serial + 1
except IOError, e:
raise RuntimeError("Unable to determine serial number: %s" % str(e))
except MissingSectionHeaderError:
fcntl.flock(fp.fileno(), fcntl.LOCK_UN)
fp.close()
f=open(serial_file,"r")
r = f.readline()
f.close()
cur_serial = int(r) + 1
fp = open(serial_file, "w")
fcntl.flock(fp.fileno(), fcntl.LOCK_EX)
parser.add_section('selfsign')
parser.set('selfsign', 'nextreplica', 500000)
parser.set('selfsign', 'replicainterval', 500000)
else:
fp = open(serial_file, "w")
fcntl.flock(fp.fileno(), fcntl.LOCK_EX)
parser.add_section('selfsign')
parser.set('selfsign', 'nextreplica', 500000)
parser.set('selfsign', 'replicainterval', 500000)
cur_serial = 1000
try:
fp.seek(0)
parser.set('selfsign', 'lastvalue', cur_serial)
parser.write(fp)
fp.flush()
fcntl.flock(fp.fileno(), fcntl.LOCK_UN)
fp.close()
except IOError, e:
raise RuntimeError("Unable to increment serial number: %s" % str(e))
return str(cur_serial)
def next_replica(serial_file=CA_SERIALNO):
"""
Return the starting serial number for a new self-signed replica
"""
fp = None
parser = RawConfigParser()
if ipautil.file_exists(serial_file):
try:
fp = open(serial_file, "r+")
fcntl.flock(fp.fileno(), fcntl.LOCK_EX)
parser.readfp(fp)
serial = parser.getint('selfsign', 'nextreplica')
nextreplica = serial + parser.getint('selfsign', 'replicainterval')
except IOError, e:
raise RuntimeError("Unable to determine serial number: %s" % str(e))
else:
raise RuntimeError("%s does not exist, cannot create replica" % serial_file)
try:
fp.seek(0)
parser.set('selfsign', 'nextreplica', nextreplica)
parser.write(fp)
fp.flush()
fcntl.flock(fp.fileno(), fcntl.LOCK_UN)
fp.close()
except IOError, e:
raise RuntimeError("Unable to increment serial number: %s" % str(e))
return str(serial)
class NSSDatabase(object):
"""A general-purpose wrapper around a NSS cert database
For permanent NSS databases, pass the cert DB directory to __init__
For temporary databases, do not pass nssdir, and call close() when done
to remove the DB. Alternatively, a NSSDatabase can be used as a
context manager that calls close() automatically.
"""
# Traditionally, we used CertDB for our NSS DB operations, but that class
# got too tied to IPA server details, killing reusability.
# BaseCertDB is a class that knows nothing about IPA.
# Generic NSS DB code should be moved here.
def __init__(self, nssdir=None):
if nssdir is None:
self.secdir = tempfile.mkdtemp()
self._is_temporary = True
else:
self.secdir = nssdir
self._is_temporary = False
def close(self):
if self._is_temporary:
shutil.rmtree(self.secdir)
def __enter__(self):
return self
def __exit__(self, type, value, tb):
self.close()
def run_certutil(self, args, stdin=None):
new_args = ["/usr/bin/certutil", "-d", self.secdir]
new_args = new_args + args
return ipautil.run(new_args, stdin)
def create_db(self, password_filename):
"""Create cert DB
:param password_filename: Name of file containing the database password
"""
self.run_certutil(["-N", "-f", password_filename])
def list_certs(self):
"""Return nicknames and cert flags for all certs in the database
:return: List of (name, trust_flags) tuples
"""
certs, stderr, returncode = self.run_certutil(["-L"])
certs = certs.splitlines()
# FIXME, this relies on NSS never changing the formatting of certutil
certlist = []
for cert in certs:
nickname = cert[0:61]
trust = cert[61:]
if re.match(r'\w*,\w*,\w*', trust):
certlist.append((nickname.strip(), trust.strip()))
return tuple(certlist)
def find_server_certs(self):
"""Return nicknames and cert flags for server certs in the database
Server certs have an "u" character in the trust flags.
:return: List of (name, trust_flags) tuples
"""
server_certs = []
for name, flags in self.list_certs():
if 'u' in flags:
server_certs.append((name, flags))
return server_certs
def get_trust_chain(self, nickname):
"""Return names of certs in a given cert's trust chain
:param nickname: Name of the cert
:return: List of certificate names
"""
root_nicknames = []
chain, stderr, returncode = self.run_certutil([
"-O", "-n", nickname])
chain = chain.splitlines()
for c in chain:
m = re.match('\s*"(.*)" \[.*', c)
if m:
root_nicknames.append(m.groups()[0])
return root_nicknames
def import_pkcs12(self, pkcs12_filename, db_password_filename,
pkcs_password_filename=None):
args = ["/usr/bin/pk12util", "-d", self.secdir,
"-i", pkcs12_filename,
"-k", db_password_filename, '-v']
if pkcs_password_filename:
args = args + ["-w", pkcs_password_filename]
try:
ipautil.run(args)
except ipautil.CalledProcessError, e:
if e.returncode == 17:
raise RuntimeError("incorrect password for pkcs#12 file %s" %
pkcs12_filename)
else:
raise RuntimeError("unknown error import pkcs#12 file %s" %
pkcs12_filename)
def find_root_cert_from_pkcs12(self, pkcs12_fname, passwd_fname=None):
"""Given a PKCS#12 file, try to find any certificates that do
not have a key. The assumption is that these are the root CAs.
"""
args = ["/usr/bin/pk12util", "-d", self.secdir,
"-l", pkcs12_fname,
"-k", passwd_fname]
if passwd_fname:
args = args + ["-w", passwd_fname]
try:
(stdout, stderr, returncode) = ipautil.run(args)
except ipautil.CalledProcessError, e:
if e.returncode == 17:
raise RuntimeError("incorrect password for pkcs#12 file")
else:
raise RuntimeError("unknown error using pkcs#12 file")
lines = stdout.split('\n')
# A simple state machine.
# 1 = looking for a line starting with 'Certificate'
# 2 = looking for the Friendly name (nickname)
nicknames = []
state = 1
for line in lines:
if state == 2:
m = re.match("\W+Friendly Name: (.*)", line)
if m:
nicknames.append( m.groups(0)[0])
state = 1
if line == "Certificate:":
state = 2
elif not line.startswith(' '):
# Top-level item that is not a certificate
state = 1
return nicknames
def trust_root_cert(self, root_nickname):
if root_nickname[:7] == "Builtin":
root_logger.debug(
"No need to add trust for built-in root CAs, skipping %s" %
root_nickname)
else:
try:
self.run_certutil(["-M", "-n", root_nickname,
"-t", "CT,CT,"])
except ipautil.CalledProcessError, e:
raise RuntimeError(
"Setting trust on %s failed" % root_nickname)
def export_pem_cert(self, nickname, location):
"""Export the given cert to PEM file in the given location"""
cert, err, returncode = self.run_certutil(["-L", "-n", nickname, "-a"])
with open(location, "w+") as fd:
fd.write(cert)
os.chmod(location, 0444)
def import_pem_cert(self, nickname, flags, location):
"""Import a cert form the given PEM file.
The file must contain exactly one certificate.
"""
with open(location) as fd:
certs = fd.read()
cert, st = find_cert_from_txt(certs)
self.add_single_pem_cert(nickname, flags, cert)
try:
find_cert_from_txt(certs, st)
except RuntimeError:
pass
else:
raise ValueError('%s contains more than one certificate')
def add_single_pem_cert(self, nick, flags, cert):
"""Import a cert in PEM format"""
self.run_certutil(["-A", "-n", nick,
"-t", flags,
"-a"],
stdin=cert)
def verify_server_cert_validity(self, nickname, hostname):
"""Verify a certificate is valid for a SSL server with given hostname
Raises a ValueError if the certificate is invalid.
"""
certdb = cert = None
nss.nss_init(self.secdir)
try:
certdb = nss.get_default_certdb()
cert = nss.find_cert_from_nickname(nickname)
intended_usage = nss.certificateUsageSSLServer
approved_usage = cert.verify_now(certdb, True, intended_usage)
if not approved_usage & intended_usage:
raise ValueError('invalid for a SSL server')
if not cert.verify_hostname(hostname):
raise ValueError('invalid for server %s' % hostname)
finally:
del certdb, cert
nss.nss_shutdown()
return None
class CertDB(object):
"""An IPA-server-specific wrapper around NSS
This class knows IPA-specific details such as nssdir location, or the
CA cert name.
"""
# TODO: Remove all selfsign code
def __init__(self, realm, nssdir=NSS_DIR, fstore=None, host_name=None, subject_base=None):
self.nssdb = NSSDatabase(nssdir)
self.secdir = nssdir
self.realm = realm
self.noise_fname = self.secdir + "/noise.txt"
self.passwd_fname = self.secdir + "/pwdfile.txt"
self.certdb_fname = self.secdir + "/cert8.db"
self.keydb_fname = self.secdir + "/key3.db"
self.secmod_fname = self.secdir + "/secmod.db"
self.cacert_fname = self.secdir + "/cacert.asc"
self.pk12_fname = self.secdir + "/cacert.p12"
self.pin_fname = self.secdir + "/pin.txt"
self.pwd_conf = "/etc/httpd/conf/password.conf"
self.reqdir = None
self.certreq_fname = None
self.certder_fname = None
self.host_name = host_name
self.subject_base = subject_base
try:
self.cwd = os.getcwd()
except OSError, e:
raise RuntimeError("Unable to determine the current directory: %s" % str(e))
self.self_signed_ca = ipa_self_signed()
if not subject_base:
self.subject_base = DN(('O', 'IPA'))
if self.self_signed_ca:
self.cacert_name = get_ca_nickname(self.realm, 'CN=%s Certificate Authority')
else:
self.cacert_name = get_ca_nickname(self.realm)
self.valid_months = "120"
self.keysize = "1024"
# We are going to set the owner of all of the cert
# files to the owner of the containing directory
# instead of that of the process. This works when
# this is called by root for a daemon that runs as
# a normal user
mode = os.stat(self.secdir)
self.uid = mode[stat.ST_UID]
self.gid = mode[stat.ST_GID]
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
subject_base = ipautil.dn_attribute_property('_subject_base')
def __del__(self):
if self.reqdir is not None:
shutil.rmtree(self.reqdir, ignore_errors=True)
try:
os.chdir(self.cwd)
except:
pass
def setup_cert_request(self):
"""
Create a temporary directory to store certificate requests and
certificates. This should be called before requesting certificates.
This is set outside of __init__ to avoid creating a temporary
directory every time we open a cert DB.
"""
if self.reqdir is not None:
return
self.reqdir = tempfile.mkdtemp('', 'ipa-', '/var/lib/ipa')
self.certreq_fname = self.reqdir + "/tmpcertreq"
self.certder_fname = self.reqdir + "/tmpcert.der"
# When certutil makes a request it creates a file in the cwd, make
# sure we are in a unique place when this happens
os.chdir(self.reqdir)
def set_serial_from_pkcs12(self):
"""A CA cert was loaded from a PKCS#12 file. Set up our serial file"""
cur_serial = self.find_cacert_serial()
try:
fp = open(CA_SERIALNO, "w")
parser = RawConfigParser()
parser.add_section('selfsign')
parser.set('selfsign', 'lastvalue', cur_serial)
parser.set('selfsign', 'nextreplica', 500000)
parser.set('selfsign', 'replicainterval', 500000)
parser.write(fp)
fp.close()
except IOError, e:
raise RuntimeError("Unable to increment serial number: %s" % str(e))
def set_perms(self, fname, write=False, uid=None):
if uid:
pent = pwd.getpwnam(uid)
os.chown(fname, pent.pw_uid, pent.pw_gid)
else:
os.chown(fname, self.uid, self.gid)
perms = stat.S_IRUSR
if write:
perms |= stat.S_IWUSR
os.chmod(fname, perms)
def gen_password(self):
return sha1(ipautil.ipa_generate_password()).hexdigest()
def run_certutil(self, args, stdin=None):
return self.nssdb.run_certutil(args, stdin)
def run_signtool(self, args, stdin=None):
if not self.self_signed_ca:
f = open(self.passwd_fname, "r")
password = f.readline()
f.close()
new_args = ["/usr/bin/signtool", "-d", self.secdir, "-p", password]
else:
new_args = ["/usr/bin/signtool", "-d", self.secdir]
new_args = new_args + args
ipautil.run(new_args, stdin)
def create_noise_file(self):
if ipautil.file_exists(self.noise_fname):
os.remove(self.noise_fname)
f = open(self.noise_fname, "w")
f.write(self.gen_password())
self.set_perms(self.noise_fname)
def create_passwd_file(self, passwd=None):
ipautil.backup_file(self.passwd_fname)
f = open(self.passwd_fname, "w")
if passwd is not None:
f.write("%s\n" % passwd)
else:
f.write(self.gen_password())
f.close()
self.set_perms(self.passwd_fname)
def create_certdbs(self):
ipautil.backup_file(self.certdb_fname)
ipautil.backup_file(self.keydb_fname)
ipautil.backup_file(self.secmod_fname)
self.nssdb.create_db(self.passwd_fname)
self.set_perms(self.passwd_fname, write=True)
def list_certs(self):
"""
Return a tuple of tuples containing (nickname, trust)
"""
return self.nssdb.list_certs()
def has_nickname(self, nickname):
"""
Returns True if nickname exists in the certdb, False otherwise.
This could also be done directly with:
certutil -L -d -n <nickname> ...
"""
certs = self.list_certs()
for cert in certs:
if nickname == cert[0]:
return True
return False
def create_ca_cert(self):
os.chdir(self.secdir)
subject = DN(('cn', '%s Certificate Authority' % self.realm))
p = subprocess.Popen(["/usr/bin/certutil",
"-d", self.secdir,
"-S", "-n", self.cacert_name,
"-s", str(subject),
"-x",
"-t", "CT,,C",
"-1",
"-2",
"-5",
"-m", next_serial(),
"-v", self.valid_months,
"-z", self.noise_fname,
"-f", self.passwd_fname],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
# Create key usage extension
# 0 - Digital Signature
# 1 - Non-repudiation
# 5 - Cert signing key
# Is this a critical extension [y/N]? y
p.stdin.write("0\n1\n5\n9\ny\n")
# Create basic constraint extension
# Is this a CA certificate [y/N]? y
# Enter the path length constraint, enter to skip [<0 for unlimited pat
# Is this a critical extension [y/N]? y
# 5 6 7 9 n -> SSL, S/MIME, Object signing CA
p.stdin.write("y\n\ny\n")
p.stdin.write("5\n6\n7\n9\nn\n")
p.wait()
os.chdir(self.cwd)
def export_ca_cert(self, nickname, create_pkcs12=False):
"""create_pkcs12 tells us whether we should create a PKCS#12 file
of the CA or not. If we are running on a replica then we won't
have the private key to make a PKCS#12 file so we don't need to
do that step."""
# export the CA cert for use with other apps
ipautil.backup_file(self.cacert_fname)
root_nicknames = self.find_root_cert(nickname)
fd = open(self.cacert_fname, "w")
for root in root_nicknames:
(cert, stderr, returncode) = self.run_certutil(["-L", "-n", root, "-a"])
fd.write(cert)
fd.close()
os.chmod(self.cacert_fname, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
if create_pkcs12:
ipautil.backup_file(self.pk12_fname)
ipautil.run(["/usr/bin/pk12util", "-d", self.secdir,
"-o", self.pk12_fname,
"-n", self.cacert_name,
"-w", self.passwd_fname,
"-k", self.passwd_fname])
self.set_perms(self.pk12_fname)
def load_cacert(self, cacert_fname):
"""
Load all the certificates from a given file. It is assumed that
this file creates CA certificates.
"""
fd = open(cacert_fname)
certs = fd.read()
fd.close()
ca_dn = DN(('CN','Certificate Authority'), self.subject_base)
st = 0
while True:
try:
(cert, st) = find_cert_from_txt(certs, st)
(rdn, subject_dn) = get_cert_nickname(cert)
if subject_dn == ca_dn:
nick = get_ca_nickname(self.realm)
else:
nick = str(subject_dn)
self.nssdb.add_single_pem_cert(nick, "CT,,C", cert)
except RuntimeError:
break
def get_cert_from_db(self, nickname, pem=True):
"""
Retrieve a certificate from the current NSS database for nickname.
pem controls whether the value returned PEM or DER-encoded. The
default is the data straight from certutil -a.
"""
try:
args = ["-L", "-n", nickname, "-a"]
(cert, err, returncode) = self.run_certutil(args)
if pem:
return cert
else:
(cert, start) = find_cert_from_txt(cert, start=0)
cert = x509.strip_header(cert)
dercert = base64.b64decode(cert)
return dercert
except ipautil.CalledProcessError:
return ''
def find_cacert_serial(self):
(out, err, returncode) = self.run_certutil(["-L", "-n", self.cacert_name])
data = out.split('\n')
for line in data:
x = re.match(r'\s+Serial Number: (\d+) .*', line)
if x is not None:
return x.group(1)
raise RuntimeError("Unable to find serial number")
def track_server_cert(self, nickname, principal, password_file=None, command=None):
"""
Tell certmonger to track the given certificate nickname.
If command is not a full path then it is prefixed with
/usr/lib[64]/ipa/certmonger.
"""
if command is not None and not os.path.isabs(command):
if sys.maxsize > 2**32:
libpath = 'lib64'
else:
libpath = 'lib'
command = '/usr/%s/ipa/certmonger/%s' % (libpath, command)
cmonger = ipaservices.knownservices.certmonger
cmonger.enable()
ipaservices.knownservices.messagebus.start()
cmonger.start()
try:
(stdout, stderr, rc) = certmonger.start_tracking(nickname, self.secdir, password_file, command)
except (ipautil.CalledProcessError, RuntimeError), e:
root_logger.error("certmonger failed starting to track certificate: %s" % str(e))
return
cmonger.stop()
cert = self.get_cert_from_db(nickname)
nsscert = x509.load_certificate(cert, dbdir=self.secdir)
subject = str(nsscert.subject)
m = re.match('New tracking request "(\d+)" added', stdout)
if not m:
root_logger.error('Didn\'t get new %s request, got %s' % (cmonger.service_name, stdout))
raise RuntimeError('%s did not issue new tracking request for \'%s\' in \'%s\'. Use \'ipa-getcert list\' to list existing certificates.' % (cmonger.service_name, nickname, self.secdir))
request_id = m.group(1)
certmonger.add_principal(request_id, principal)
certmonger.add_subject(request_id, subject)
cmonger.start()
def untrack_server_cert(self, nickname):
"""
Tell certmonger to stop tracking the given certificate nickname.
"""
# Always start certmonger. We can't untrack something if it isn't
# running
cmonger = ipaservices.knownservices.certmonger
ipaservices.knownservices.messagebus.start()
cmonger.start()
try:
certmonger.stop_tracking(self.secdir, nickname=nickname)
except (ipautil.CalledProcessError, RuntimeError), e:
root_logger.error("certmonger failed to stop tracking certificate: %s" % str(e))
cmonger.stop()
def create_server_cert(self, nickname, hostname, other_certdb=None, subject=None):
"""
other_certdb can mean one of two things, depending on the context.
If we are using a self-signed CA then other_certdb contains the
CA that will be signing our CSR.
If we are using a dogtag CA then it contains the RA agent key
that will issue our cert.
You can override the certificate Subject by specifying a subject.
Returns a certificate in DER format.
"""
cdb = other_certdb
if not cdb:
cdb = self
if subject is None:
subject=DN(('CN', hostname), self.subject_base)
self.request_cert(subject)
cdb.issue_server_cert(self.certreq_fname, self.certder_fname)
self.add_cert(self.certder_fname, nickname)
fd = open(self.certder_fname, "r")
dercert = fd.read()
fd.close()
os.unlink(self.certreq_fname)
os.unlink(self.certder_fname)
return dercert
def create_signing_cert(self, nickname, hostname, other_certdb=None, subject=None):
cdb = other_certdb
if not cdb:
cdb = self
if subject is None:
subject=DN(('CN', hostname), self.subject_base)
self.request_cert(subject)
cdb.issue_signing_cert(self.certreq_fname, self.certder_fname)
self.add_cert(self.certder_fname, nickname)
os.unlink(self.certreq_fname)
os.unlink(self.certder_fname)
def request_cert(self, subject, certtype="rsa", keysize="2048"):
assert isinstance(subject, DN)
self.create_noise_file()
self.setup_cert_request()
args = ["-R", "-s", str(subject),
"-o", self.certreq_fname,
"-k", certtype,
"-g", keysize,
"-z", self.noise_fname,
"-f", self.passwd_fname]
if not self.self_signed_ca:
args.append("-a")
(stdout, stderr, returncode) = self.run_certutil(args)
os.remove(self.noise_fname)
return (stdout, stderr)
def issue_server_cert(self, certreq_fname, cert_fname):
self.setup_cert_request()
if self.self_signed_ca:
p = subprocess.Popen(["/usr/bin/certutil",
"-d", self.secdir,
"-C", "-c", self.cacert_name,
"-i", certreq_fname,
"-o", cert_fname,
"-m", next_serial(),
"-v", self.valid_months,
"-f", self.passwd_fname,
"-1", "-5"],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
# Bah - this sucks, but I guess it isn't possible to fully
# control this with command line arguments.
#
# What this is requesting is:
# -1 (Create key usage extension)
# 2 - Key encipherment
# 9 - done
# n - not critical
#
# -5 (Create netscape cert type extension)
# 1 - SSL Server
# 9 - done
# n - not critical
p.stdin.write("2\n9\nn\n1\n9\nn\n")
p.wait()
else:
if self.host_name is None:
raise RuntimeError("CA Host is not set.")
f = open(certreq_fname, "r")
csr = f.readlines()
f.close()
csr = "".join(csr)
# We just want the CSR bits, make sure there is nothing else
csr = pkcs10.strip_header(csr)
params = {'profileId': 'caIPAserviceCert',
'cert_request_type': 'pkcs10',
'requestor_name': 'IPA Installer',
'cert_request': csr,
'xmlOutput': 'true'}
# Send the request to the CA
f = open(self.passwd_fname, "r")
password = f.readline()
f.close()
result = dogtag.https_request(
self.host_name,
api.env.ca_ee_install_port or
dogtag.configured_constants().EE_SECURE_PORT,
"/ca/ee/ca/profileSubmitSSLClient",
self.secdir, password, "ipaCert", **params)
http_status, http_reason_phrase, http_headers, http_body = result
if http_status != 200:
raise CertificateOperationError(
error=_('Unable to communicate with CMS (%s)') %
http_reason_phrase)
# The result is an XML blob. Pull the certificate out of that
doc = xml.dom.minidom.parseString(http_body)
item_node = doc.getElementsByTagName("b64")
try:
try:
cert = item_node[0].childNodes[0].data
except IndexError:
raise RuntimeError("Certificate issuance failed")
finally:
doc.unlink()
# base64-decode the result for uniformity
cert = base64.b64decode(cert)
# Write the certificate to a file. It will be imported in a later
# step. This file will be read later to be imported.
f = open(cert_fname, "w")
f.write(cert)
f.close()
return
def issue_signing_cert(self, certreq_fname, cert_fname):
self.setup_cert_request()
if self.self_signed_ca:
p = subprocess.Popen(["/usr/bin/certutil",
"-d", self.secdir,
"-C", "-c", self.cacert_name,
"-i", certreq_fname,
"-o", cert_fname,
"-m", next_serial(),
"-v", self.valid_months,
"-f", self.passwd_fname,
"-1", "-5"],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
# Bah - this sucks, but I guess it isn't possible to fully
# control this with command line arguments.
#
# What this is requesting is:
# -1 (Create key usage extension)
# 0 - Digital Signature
# 5 - Cert signing key
# 9 - done
# n - not critical
#
# -5 (Create netscape cert type extension)
# 3 - Object Signing
# 9 - done
# n - not critical
p.stdin.write("0\n5\n9\nn\n3\n9\nn\n")
p.wait()
else:
if self.host_name is None:
raise RuntimeError("CA Host is not set.")
f = open(certreq_fname, "r")
csr = f.readlines()
f.close()
csr = "".join(csr)
# We just want the CSR bits, make sure there is no thing else
csr = pkcs10.strip_header(csr)
params = {'profileId': 'caJarSigningCert',
'cert_request_type': 'pkcs10',
'requestor_name': 'IPA Installer',
'cert_request': csr,
'xmlOutput': 'true'}
# Send the request to the CA
f = open(self.passwd_fname, "r")
password = f.readline()
f.close()
result = dogtag.https_request(
self.host_name,
api.env.ca_ee_install_port or
dogtag.configured_constants().EE_SECURE_PORT,
"/ca/ee/ca/profileSubmitSSLClient",
self.secdir, password, "ipaCert", **params)
http_status, http_reason_phrase, http_headers, http_body = result
if http_status != 200:
raise RuntimeError("Unable to submit cert request")
# The result is an XML blob. Pull the certificate out of that
doc = xml.dom.minidom.parseString(http_body)
item_node = doc.getElementsByTagName("b64")
cert = item_node[0].childNodes[0].data
doc.unlink()
# base64-decode the cert for uniformity
cert = base64.b64decode(cert)
# Write the certificate to a file. It will be imported in a later
# step. This file will be read later to be imported.
f = open(cert_fname, "w")
f.write(cert)
f.close()
return
def add_cert(self, cert_fname, nickname):
"""
Load a certificate from a PEM file and add minimal trust.
"""
args = ["-A", "-n", nickname,
"-t", "u,u,u",
"-i", cert_fname,
"-f", self.passwd_fname]
self.run_certutil(args)
def create_pin_file(self):
"""
This is the format of Directory Server pin files.
"""
ipautil.backup_file(self.pin_fname)
f = open(self.pin_fname, "w")
f.write("Internal (Software) Token:")
pwdfile = open(self.passwd_fname)
f.write(pwdfile.read())
f.close()
pwdfile.close()
self.set_perms(self.pin_fname)
def create_password_conf(self):
"""
This is the format of mod_nss pin files.
"""
ipautil.backup_file(self.pwd_conf)
f = open(self.pwd_conf, "w")
f.write("internal:")
pwdfile = open(self.passwd_fname)
f.write(pwdfile.read())
f.close()
pwdfile.close()
# TODO: replace explicit uid by a platform-specific one
self.set_perms(self.pwd_conf, uid="apache")
def find_root_cert(self, nickname):
"""
Given a nickname, return a list of the certificates that make up
the trust chain.
"""
root_nicknames = self.nssdb.get_trust_chain(nickname)
# Try to work around a change in the F-11 certutil where untrusted
# CA's are not shown in the chain. This will make a default IPA
# server installable.
if len(root_nicknames) == 0 and self.self_signed_ca:
return [self.cacert_name]
return root_nicknames
def find_root_cert_from_pkcs12(self, pkcs12_fname, passwd_fname=None):
"""Given a PKCS#12 file, try to find any certificates that do
not have a key. The assumption is that these are the root CAs.
"""
args = ["/usr/bin/pk12util", "-d", self.secdir,
"-l", pkcs12_fname,
"-k", passwd_fname]
if passwd_fname:
args = args + ["-w", passwd_fname]
try:
(stdout, stderr, returncode) = ipautil.run(args)
except ipautil.CalledProcessError, e:
if e.returncode == 17:
raise RuntimeError("incorrect password")
else:
raise RuntimeError("unknown error using pkcs#12 file")
lines = stdout.split('\n')
# A simple state machine.
# 1 = looking for "Certificate:"
# 2 = looking for the Friendly name (nickname)
nicknames = []
state = 1
for line in lines:
if state == 2:
m = re.match("\W+Friendly Name: (.*)", line)
if m:
nicknames.append( m.groups(0)[0])
state = 1
if line == "Certificate:":
state = 2
return nicknames
def trust_root_cert(self, root_nickname):
if root_nickname is None:
root_logger.debug("Unable to identify root certificate to trust. Continuing but things are likely to fail.")
return
try:
self.nssdb.trust_root_cert(root_nickname)
except RuntimeError:
pass
def find_server_certs(self):
return self.nssdb.find_server_certs()
def import_pkcs12(self, pkcs12_fname, passwd_fname=None):
return self.nssdb.import_pkcs12(pkcs12_fname, self.passwd_fname,
pkcs_password_filename=passwd_fname)
def export_pkcs12(self, pkcs12_fname, pkcs12_pwd_fname, nickname=None):
if nickname is None:
nickname = get_ca_nickname(api.env.realm)
ipautil.run(["/usr/bin/pk12util", "-d", self.secdir,
"-o", pkcs12_fname,
"-n", nickname,
"-k", self.passwd_fname,
"-w", pkcs12_pwd_fname])
def export_pem_p12(self, pkcs12_fname, pkcs12_pwd_fname,
nickname, pem_fname):
ipautil.run(["/usr/bin/openssl", "pkcs12",
"-export", "-name", nickname,
"-in", pem_fname, "-out", pkcs12_fname,
"-passout", "file:" + pkcs12_pwd_fname])
def create_self_signed(self, passwd=None):
self.create_noise_file()
self.create_passwd_file(passwd)
self.create_certdbs()
self.create_ca_cert()
self.export_ca_cert(self.cacert_name, True)
self.create_pin_file()
def create_from_cacert(self, cacert_fname, passwd=None):
if ipautil.file_exists(self.certdb_fname):
# We already have a cert db, see if it is for the same CA.
# If it is we leave things as they are.
f = open(cacert_fname, "r")
newca = f.readlines()
f.close()
newca = "".join(newca)
(newca, st) = find_cert_from_txt(newca)
cacert = self.get_cert_from_db(self.cacert_name)
if cacert != '':
(cacert, st) = find_cert_from_txt(cacert)
if newca == cacert:
return
# The CA certificates are different or something went wrong. Start with
# a new certificate database.
self.create_passwd_file(passwd)
self.create_certdbs()
self.load_cacert(cacert_fname)
def create_from_pkcs12(self, pkcs12_fname, pkcs12_pwd_fname, passwd=None):
"""Create a new NSS database using the certificates in a PKCS#12 file.
pkcs12_fname: the filename of the PKCS#12 file
pkcs12_pwd_fname: the file containing the pin for the PKCS#12 file
nickname: the nickname/friendly-name of the cert we are loading
passwd: The password to use for the new NSS database we are creating
The global CA may be added as well in case it wasn't included in the
PKCS#12 file. Extra certs won't hurt in any case.
"""
self.create_noise_file()
self.create_passwd_file(passwd)
self.create_certdbs()
self.import_pkcs12(pkcs12_fname, pkcs12_pwd_fname)
server_certs = self.find_server_certs()
if len(server_certs) == 0:
raise RuntimeError("Could not find a suitable server cert in import in %s" % pkcs12_fname)
# We only handle one server cert
nickname = server_certs[0][0]
ca_names = [name for name, flags
in self.nssdb.list_certs() if 'u' not in flags]
if len(ca_names) == 0:
raise RuntimeError("Could not find a CA cert in %s" % pkcs12_fname)
self.cacert_name = ca_names[0]
for ca in ca_names:
self.trust_root_cert(ca)
self.create_pin_file()
self.export_ca_cert(nickname, False)
self.self_signed_ca=False
# This file implies that we have our own self-signed CA. Ensure
# that it no longer exists (from previous installs, for example).
try:
os.remove(CA_SERIALNO)
except:
pass
def create_kdc_cert(self, nickname, hostname, destdir):
"""Create a new certificate with the spcial othername encoding needed
by a KDC certificate.
nickname: the CN name set in the certificate
destdir: the location where cert and key are to be installed
destdir will contain kdc.pem if the operation is successful
"""
reqcfg = "kdc_req.conf"
extcfg = ipautil.SHARE_DIR + "kdc_extensions.template"
key_fname = destdir + "/kdckey.pem"
cert_fname = destdir + "/kdccert.pem"
key_cert_fname = destdir + "/kdc.pem"
# Setup the temp dir
self.setup_cert_request()
# Copy the CA password file because openssl apparently can't use
# the same file twice within the same command and throws an error
ca_pwd_file = self.reqdir + "pwdfile.txt"
shutil.copyfile(self.passwd_fname, ca_pwd_file)
# Extract the cacert.pem file used by openssl to sign the certs
ipautil.run(["/usr/bin/openssl", "pkcs12",
"-in", self.pk12_fname,
"-passin", "file:" + self.passwd_fname,
"-passout", "file:" + ca_pwd_file,
"-out", "cacert.pem"])
# Create the kdc key
ipautil.run(["/usr/bin/openssl", "genrsa",
"-out", key_fname, "2048"])
# Prepare a simple cert request
req_dict = dict(PASSWORD=self.gen_password(),
SUBJBASE=self.subject_base,
CERTNAME=DN(('CN', nickname)))
req_template = ipautil.SHARE_DIR + reqcfg + ".template"
conf = ipautil.template_file(req_template, req_dict)
fd = open(reqcfg, "w+")
fd.write(conf)
fd.close()
base = str(self.subject_base).replace(",", "/")
esc_subject = DN(('CN', '%s/%s' % (nickname, base)))
ipautil.run(["/usr/bin/openssl", "req", "-new",
"-config", reqcfg,
"-subj", str(esc_subject),
"-key", key_fname,
"-out", "kdc.req"])
# Finally, sign the cert using the extensions file to set the
# special name
ipautil.run(["/usr/bin/openssl", "x509", "-req",
"-CA", "cacert.pem",
"-extfile", extcfg,
"-extensions", "kdc_cert",
"-passin", "file:" + ca_pwd_file,
"-set_serial", next_serial(),
"-in", "kdc.req",
"-out", cert_fname],
env = { 'REALM':self.realm, 'HOST_FQDN':hostname })
# Merge key and cert in a single file
fd = open(key_fname, "r")
key = fd.read()
fd.close()
fd = open(cert_fname, "r")
cert = fd.read()
fd.close()
fd = open(key_cert_fname, "w")
fd.write(key)
fd.write(cert)
fd.close()
os.unlink(key_fname)
os.unlink(cert_fname)
def install_pem_from_p12(self, p12_fname, p12_pwd_fname, pem_fname):
ipautil.run(["/usr/bin/openssl", "pkcs12", "-nodes",
"-in", p12_fname, "-out", pem_fname,
"-passin", "file:" + p12_pwd_fname])
def publish_ca_cert(self, location):
shutil.copy(self.cacert_fname, location)
os.chmod(location, 0444)
def export_pem_cert(self, nickname, location):
return self.nssdb.export_pem_cert(nickname, location)
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