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freeipa/ipaserver/install/certs.py
Rob Crittenden 8a32bb3746 Make dogtag an optional (and default un-) installed component in a replica. 
A dogtag replica file is created as usual. When the replica is installed
dogtag is optional and not installed by default. Adding the --setup-ca
option will configure it when the replica is installed.

A new tool ipa-ca-install will configure dogtag if it wasn't configured
when the replica was initially installed.

This moves a fair bit of code out of ipa-replica-install into
installutils and cainstance to avoid duplication.

https://fedorahosted.org/freeipa/ticket/1251
2011-06-23 19:04:33 -04:00

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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 errno
import tempfile
import shutil
import logging
import urllib
import xml.dom.minidom
import pwd
import fcntl
import base64
from ipapython import nsslib
from ipapython import dogtag
from ipapython import sysrestore
from ipapython import ipautil
from ipapython import certmonger
from ipapython.certdb import get_ca_nickname
from ipalib import pkcs10
from ConfigParser import RawConfigParser, MissingSectionHeaderError
import service
from ipalib import x509
from ipalib.errors import CertificateOperationError
from nss.error import NSPRError
import nss.nss as nss
from ipalib import api
from ipalib.compat import sha1
# 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 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 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 CertDB(object):
def __init__(self, realm, nssdir=NSS_DIR, fstore=None, host_name=None, subject_base=None):
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 = "O=IPA"
self.subject_format = "CN=%%s,%s" % self.subject_base
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')
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):
new_args = ["/usr/bin/certutil", "-d", self.secdir]
new_args = new_args + args
return ipautil.run(new_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.run_certutil(["-N",
"-f", self.passwd_fname])
self.set_perms(self.passwd_fname, write=True)
def list_certs(self):
"""
Return a tuple of tuples containing (nickname, trust)
"""
p = subprocess.Popen(["/usr/bin/certutil", "-d", self.secdir,
"-L"], stdout=subprocess.PIPE)
certs = p.stdout.read()
certs = certs.split("\n")
# 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))
return tuple(certlist)
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 = "cn=%s Certificate Authority" % self.realm
p = subprocess.Popen(["/usr/bin/certutil",
"-d", self.secdir,
"-S", "-n", self.cacert_name,
"-s", 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()
st = 0
subid=0
while True:
try:
(cert, st) = find_cert_from_txt(certs, st)
if subid == 0:
nick = self.cacert_name
else:
nick = "%s sub %d" % (self.cacert_name, subid)
subid = subid + 1
self.run_certutil(["-A", "-n", nick,
"-t", "CT,,C",
"-a"],
stdin=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):
"""
Tell certmonger to track the given certificate nickname.
"""
service.chkconfig_on("certmonger")
service.start("certmonger")
try:
(stdout, stderr, rc) = certmonger.start_tracking(nickname, self.secdir, password_file)
except (ipautil.CalledProcessError, RuntimeError), e:
logging.error("certmonger failed starting to track certificate: %s" % str(e))
return
service.stop("certmonger")
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:
logging.error('Didn\'t get new certmonger request, got %s' % stdout)
raise RuntimeError('certmonger did not issue new tracking request for \'%s\' in \'%s\'. Use \'ipa-getcert list\' to list existing certificates.' % (nickname, self.secdir))
request_id = m.group(1)
certmonger.add_principal(request_id, principal)
certmonger.add_subject(request_id, subject)
service.start("certmonger")
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
service.start("certmonger")
try:
certmonger.stop_tracking(self.secdir, nickname=nickname)
except (ipautil.CalledProcessError, RuntimeError), e:
logging.error("certmonger failed to stop tracking certificate: %s" % str(e))
service.stop("certmonger")
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=self.subject_format % hostname
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=self.subject_format % hostname
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"):
self.create_noise_file()
self.setup_cert_request()
args = ["-R", "-s", 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': 'caRAserverCert',
'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()
http_status, http_reason_phrase, http_headers, http_body = \
dogtag.https_request(self.host_name, api.env.ca_ee_port, "/ca/ee/ca/profileSubmitSSLClient", self.secdir, password, "ipaCert", **params)
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()
http_status, http_reason_phrase, http_headers, http_body = \
dogtag.https_request(self.host_name, api.env.ca_ee_port, "/ca/ee/ca/profileSubmitSSLClient", self.secdir, password, "ipaCert", **params)
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()
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 = []
p = subprocess.Popen(["/usr/bin/certutil", "-d", self.secdir,
"-O", "-n", nickname], stdout=subprocess.PIPE)
chain = p.stdout.read()
chain = chain.split("\n")
for c in chain:
m = re.match('\s*"(.*)" \[.*', c)
if m:
root_nicknames.append(m.groups()[0])
if len(root_nicknames) > 1:
# If you pass in the name of a CA to get the chain it may only
# return 1 (self-signed). Return that.
try:
root_nicknames.remove(nickname)
except ValueError:
# The nickname wasn't in the list
pass
# 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:
logging.debug("Unable to identify root certificate to trust. Continueing but things are likely to fail.")
return
if root_nickname[:7] == "Builtin":
logging.debug("No need to add trust for built-in root CA's, skipping %s" % root_nickname)
else:
try:
self.run_certutil(["-M", "-n", root_nickname,
"-t", "CT,CT,"])
except ipautil.CalledProcessError, e:
logging.error("Setting trust on %s failed" % root_nickname)
def find_server_certs(self):
p = subprocess.Popen(["/usr/bin/certutil", "-d", self.secdir,
"-L"], stdout=subprocess.PIPE)
certs = p.stdout.read()
certs = certs.split("\n")
server_certs = []
for cert in certs:
fields = cert.split()
if not len(fields):
continue
flags = fields[-1]
if 'u' in flags:
name = " ".join(fields[0:-1])
# NSS 3.12 added a header to the certutil output
if name == "Certificate Nickname Trust":
continue
server_certs.append((name, flags))
return server_certs
def import_pkcs12(self, pkcs12_fname, passwd_fname=None):
args = ["/usr/bin/pk12util", "-d", self.secdir,
"-i", pkcs12_fname,
"-k", self.passwd_fname]
if passwd_fname:
args = args + ["-w", passwd_fname]
try:
ipautil.run(args)
except ipautil.CalledProcessError, e:
if e.returncode == 17:
raise RuntimeError("incorrect password")
else:
raise RuntimeError("unknown error import pkcs#12 file")
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=""):
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 = self.find_root_cert_from_pkcs12(pkcs12_fname, pkcs12_pwd_fname)
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="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 = self.subject_base.replace(",", "/")
esc_subject = "CN=%s/%s" % (nickname, base)
ipautil.run(["/usr/bin/openssl", "req", "-new",
"-config", reqcfg,
"-subj", 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 backup_files(self):
self.fstore.backup_file(self.noise_fname)
self.fstore.backup_file(self.passwd_fname)
self.fstore.backup_file(self.certdb_fname)
self.fstore.backup_file(self.keydb_fname)
self.fstore.backup_file(self.secmod_fname)
self.fstore.backup_file(self.cacert_fname)
self.fstore.backup_file(self.pk12_fname)
self.fstore.backup_file(self.pin_fname)
self.fstore.backup_file(self.certreq_fname)
self.fstore.backup_file(self.certder_fname)
def publish_ca_cert(self, location):
shutil.copy(self.cacert_fname, location)
os.chmod(location, 0444)
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