certmaster/certs.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 # Copyright (c) 2007 Red Hat, inc
  15 #- Written by Seth Vidal skvidal @ fedoraproject.org
  16
  17 from OpenSSL import crypto
  18 import socket
  19 import os
  20 import utils
  21
  22 def_country = 'UN'
  23 def_state = 'FC'
  24 def_local = 'Certmaster-town'
  25 def_org = 'certmaster'
  26 def_ou = 'slave-key'
  27
  28
  29 def make_keypair(dest=None):
  30     pkey = crypto.PKey()
  31     pkey.generate_key(crypto.TYPE_RSA, 2048)
  32     if dest:
  33         destfd = os.open(dest, os.O_RDWR|os.O_CREAT, 0600)
  34         os.write(destfd, (crypto.dump_privatekey(crypto.FILETYPE_PEM, pkey)))
  35         os.close(destfd)
  36
  37     return pkey
  38
  39
  40 def make_csr(pkey, dest=None, cn=None):
  41     req = crypto.X509Req()
  42     req.get_subject()
  43     subj  = req.get_subject()
  44     subj.C = def_country
  45     subj.ST = def_state
  46     subj.L = def_local
  47     subj.O = def_org
  48     subj.OU = def_ou
  49     if cn:
  50         subj.CN = cn
  51     else:
  52         subj.CN = utils.get_hostname()
  53     subj.emailAddress = 'root@%s' % subj.CN
  54
  55     req.set_pubkey(pkey)
  56     req.sign(pkey, 'md5')
  57     if dest:
  58         destfd = os.open(dest, os.O_RDWR|os.O_CREAT, 0644)
  59         os.write(destfd, crypto.dump_certificate_request(crypto.FILETYPE_PEM, req))
  60         os.close(destfd)
  61
  62     return req
  63
  64
  65 def retrieve_key_from_file(keyfile):
  66     fo = open(keyfile, 'r')
  67     buf = fo.read()
  68     keypair = crypto.load_privatekey(crypto.FILETYPE_PEM, buf)
  69     return keypair
  70
  71
  72 def retrieve_csr_from_file(csrfile):
  73     fo = open(csrfile, 'r')
  74     buf = fo.read()
  75     csrreq = crypto.load_certificate_request(crypto.FILETYPE_PEM, buf)
  76     return csrreq
  77
  78
  79 def retrieve_cert_from_file(certfile):
  80     fo = open(certfile, 'r')
  81     buf = fo.read()
  82     cert = crypto.load_certificate(crypto.FILETYPE_PEM, buf)
  83     return cert
  84
  85
  86 def create_ca(CN="Certmaster Certificate Authority", ca_key_file=None, ca_cert_file=None):
  87     cakey = make_keypair(dest=ca_key_file)
  88     careq = make_csr(cakey, cn=CN)
  89     cacert = crypto.X509()
  90     cacert.set_serial_number(0)
  91     cacert.gmtime_adj_notBefore(0)
  92     cacert.gmtime_adj_notAfter(60*60*24*365*10) # 10 yrs - hard to beat this kind of cert!
  93     cacert.set_issuer(careq.get_subject())
  94     cacert.set_subject(careq.get_subject())
  95     cacert.set_pubkey(careq.get_pubkey())
  96     cacert.sign(cakey, 'md5')
  97     if ca_cert_file:
  98         destfo = open(ca_cert_file, 'w')
  99         destfo.write(crypto.dump_certificate(crypto.FILETYPE_PEM, cacert))
 100         destfo.close()
 101
 102
 103 def _get_serial_number(cadir):
 104     serial = '%s/serial.txt' % cadir
 105     i = 1
 106     if os.path.exists(serial):
 107         f = open(serial, 'r').read()
 108         f = f.replace('\n','')
 109         try:
 110             i = int(f)
 111             i+=1
 112         except ValueError, e:
 113             i = 1
 114
 115     _set_serial_number(cadir, i)
 116     return i
 117
 118
 119 def _set_serial_number(cadir, last):
 120     serial = '%s/serial.txt' % cadir
 121     f = open(serial, 'w')
 122     f.write(str(last) + '\n')
 123     f.close()
 124
 125
 126 def create_slave_certificate(csr, cakey, cacert, cadir, slave_cert_file=None):
 127     cert = crypto.X509()
 128     cert.set_serial_number(_get_serial_number(cadir))
 129     cert.gmtime_adj_notBefore(0)
 130     cert.gmtime_adj_notAfter(60*60*24*365*10) # 10 yrs - hard to beat this kind of cert!
 131     cert.set_issuer(cacert.get_subject())
 132     cert.set_subject(csr.get_subject())
 133     cert.set_pubkey(csr.get_pubkey())
 134     cert.sign(cakey, 'md5')
 135     if slave_cert_file:
 136         destfo = open(slave_cert_file, 'w')
 137         destfo.write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
 138         destfo.close()
 139     return cert