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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; version 2 or later
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import os, stat, subprocess
import sha
from ipa import ipautil
class CertDB(object):
def __init__(self, dir):
self.secdir = dir
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.certreq_fname = self.secdir + "/tmpcertreq"
self.certder_fname = self.secdir + "/tmpcert.der"
# Making this a starting value that will generate
# unique values for the current DB is the
# responsibility of the caller for now. In the
# future we might automatically determine this
# for a given db.
self.cur_serial = 1000
self.cacert_name = "CA certificate"
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]
def next_serial(self):
r = self.cur_serial
self.cur_serial += 1
return str(r)
def set_perms(self, fname, write=False):
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 sha.sha(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
ipautil.run(new_args, stdin)
def create_noise_file(self):
ipautil.backup_file(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=True):
ipautil.backup_file(self.passwd_fname)
f = open(self.passwd_fname, "w")
if passwd:
f.write(self.gen_password())
else:
f.write("\n")
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 create_ca_cert(self):
# Generate the encryption key
self.run_certutil(["-G", "-z", self.noise_fname, "-f", self.passwd_fname])
# Generate the self-signed cert
self.run_certutil(["-S", "-n", self.cacert_name,
"-s", "cn=CAcert",
"-x",
"-t", "CT,,",
"-m", self.next_serial(),
"-v", self.valid_months,
"-z", self.noise_fname,
"-f", self.passwd_fname])
# export the CA cert for use with other apps
ipautil.backup_file(self.cacert_fname)
self.run_certutil(["-L", "-n", "CA certificate",
"-a",
"-o", self.cacert_fname])
self.set_perms(self.cacert_fname)
ipautil.backup_file(self.pk12_fname)
ipautil.run(["/usr/bin/pk12util", "-d", self.secdir,
"-o", self.pk12_fname,
"-n", "CA certificate",
"-w", self.passwd_fname,
"-k", self.passwd_fname])
self.set_perms(self.pk12_fname)
def load_cacert(self, cacert_fname):
self.run_certutil(["-A", "-n", self.cacert_name,
"-t", "CT,CT,",
"-a",
"-i", cacert_fname])
def create_server_cert(self, nickname, name, other_certdb=None):
cdb = other_certdb
if not cdb:
cdb = self
self.request_cert(name)
cdb.issue_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, name):
self.run_certutil(["-R", "-s", name,
"-o", self.certreq_fname,
"-g", self.keysize,
"-z", self.noise_fname,
"-f", self.passwd_fname])
def issue_cert(self, certreq_fname, cert_fname):
p = subprocess.Popen(["/usr/bin/certutil",
"-d", self.secdir,
"-C", "-c", self.cacert_name,
"-i", certreq_fname,
"-o", cert_fname,
"-m", self.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()
def add_cert(self, cert_fname, nickname):
self.run_certutil(["-A", "-n", nickname,
"-t", "u,u,u",
"-i", cert_fname,
"-f", cert_fname])
def create_pin_file(self):
ipautil.backup_file(self.pin_fname)
f = open(self.pin_fname, "w")
f.write("Internal (Software) Token:")
pwd = open(self.passwd_fname)
f.write(pwd.read())
f.close()
self.set_perms(self.pin_fname)
def create_self_signed(self, passwd=True):
self.create_noise_file()
self.create_passwd_file(passwd)
self.create_certdbs()
self.create_ca_cert()
self.create_pin_file()
def create_from_cacert(self, cacert_fname, passwd=False):
self.create_noise_file()
self.create_passwd_file(passwd)
self.create_certdbs()
self.load_cacert(cacert_fname)
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