+import errno
+import fcntl
+import logging
+import re
+import os
+import getpass
+import random
+import shutil
+import tempfile
+import time
+from cam import openssl_wrap
+from cam import utils
+
+log = logging.getLogger(__name__)
+
+
+class _CAFiles(object):
+
+ def __init__(self, basedir, **attrs):
+ for key, value in attrs.items():
+ setattr(self, key, os.path.join(basedir, value))
+
+
+class CA(object):
+
+ def __init__(self, basedir, config, password=None):
+ self._pw = password
+ self.basedir = basedir
+ self.config = {'basedir': basedir, 'default_days': '365', 'ou': 'CA',
+ 'days': '3650', 'country': 'XX', 'crl_url': '',
+ 'bits': '4096'}
+ self.config.update(config)
+ self.files = _CAFiles(basedir,
+ conf='conf/ca.conf',
+ public_key='public/ca.pem',
+ private_key='private/ca.key',
+ crl='public/crl.pem',
+ serial='serial',
+ crlnumber='crlnumber',
+ index='index')
+ self._lock()
+
+ def _getpw(self):
+ if self._pw is None:
+ self._pw = getpass.getpass(prompt='CA Password: ')
+ return self._pw
+
+ def _lock(self):
+ self._lockfd = open(os.path.join(self.basedir, '_lock'), 'w+')
+ n = 3
+ while True:
+ try:
+ fcntl.lockf(self._lockfd, fcntl.LOCK_EX | fcntl.LOCK_NB)
+ break
+ except IOError, e:
+ if e.errno in (errno.EACCES, errno.EAGAIN):
+ n -= 1
+ if n == 0:
+ log.error('another instance is running')
+ raise
+ time.sleep(1)
+ continue
+ raise
+
+ def _unlock(self):
+ fcntl.lockf(self._lockfd, fcntl.LOCK_UN)
+ self._lockfd.close()
+
+ def close(self):
+ self._unlock()
+
+ def create(self):
+ old_umask = os.umask(077)
+
+ for pathext in ('', 'conf', 'public', 'public/certs',
+ 'public/crl', 'private', 'newcerts'):
+ fullpath = os.path.join(self.basedir, pathext)
+ if not os.path.isdir(fullpath):
+ os.mkdir(fullpath)
+
+ if not os.path.exists(self.files.index):
+ log.info('creating new index file')
+ open(self.files.index, 'w').close()
+
+ if not os.path.exists(self.files.serial):
+ serial = random.randint(1, 1000000000)
+ log.info('initializing serial number (%d)', serial)
+ with open(self.files.serial, 'w') as fd:
+ fd.write('%08X\n' % serial)
+
+ if not os.path.exists(self.files.crlnumber):
+ with open(self.files.crlnumber, 'w') as fd:
+ fd.write('01\n')
+
+ # Create the OpenSSL configuration file.
+ utils.render(self.files.conf, 'openssl_config', self.config)
+
+ # Generate keys if they do not exist.
+ if not os.path.exists(self.files.public_key):
+ tmpdir = tempfile.mkdtemp()
+ csr_file = os.path.join(tmpdir, 'ca.csr')
+ log.info('creating new RSA CA CSR')
+ openssl_wrap.run_with_config(
+ self.files.conf, 'req', '-new',
+ '-passout', 'pass:%s' % self._getpw(),
+ '-keyout', self.files.private_key, '-out', csr_file)
+ log.info('self-signing RSA CA certificate')
+ openssl_wrap.run_with_config(
+ self.files.conf, 'ca', '-keyfile', self.files.private_key,
+ '-key', self._getpw(),
+ '-extensions', 'v3_ca', '-out', self.files.public_key,
+ '-days', self.config.get('days', self.config['default_days']),
+ '-selfsign', '-infiles', csr_file)
+ shutil.rmtree(tmpdir)
+
+ os.umask(old_umask)
+
+ # Make some files public.
+ for path in (os.path.join(self.basedir, 'public'),
+ os.path.join(self.basedir, 'public/certs'),
+ self.files.public_key):
+ if os.path.isdir(path):
+ os.chmod(path, 0755)
+ else:
+ os.chmod(path, 0644)
+
+ def gencrl(self):
+ log.info('generating CRL')
+ openssl_wrap.run_with_config(
+ self.files.conf, 'ca', '-gencrl', '-out', self.files.crl,
+ '-key', self._getpw())
+ os.chmod(self.files.crl, 0644)
+
+ def revoke(self, cert):
+ log.info('revoking certificate %s', cert.name)
+ openssl_wrap.run_with_config(
+ self.files.conf, 'ca', '-revoke', cert.public_key_file,
+ '-key', self._getpw())
+ self.gencrl()
+
+ def generate(self, cert):
+ expiry = cert.get_expiration_date()
+ if expiry and expiry > time.time():
+ log.warn('certificate is still valid, revoking previous version')
+ self.revoke(cert)
+
+ log.info('generating new certificate %s', cert.name)
+ tmpdir = tempfile.mkdtemp()
+ try:
+ csr_file = os.path.join(tmpdir, '%s.csr' % cert.name)
+ conf_file = os.path.join(tmpdir, '%s.conf' % cert.name)
+ ext_file = os.path.join(tmpdir, '%s-ext.conf' % cert.name)
+ conf = {}
+ conf.update(self.config)
+ conf['cn'] = cert.cn
+ conf['days'] = cert.days or self.config['default_days']
+ if cert.ou:
+ conf['ou'] = cert.ou
+ conf['alt_names'] = ''.join(
+ ['DNS.%d=%s\n' % (idx + 1, x)
+ for idx, x in enumerate(cert.alt_names)])
+ utils.render(conf_file, 'openssl_config', conf)
+ utils.render(ext_file, 'ext_config', conf)
+ openssl_wrap.run_with_config(
+ conf_file, 'req', '-new', '-keyout', cert.private_key_file,
+ '-nodes', '-out', csr_file)
+ os.chmod(cert.private_key_file, 0600)
+ openssl_wrap.run_with_config(
+ conf_file, 'ca', '-days', conf['days'],
+ '-key', self._getpw(),
+ '-policy', 'policy_anything', '-out', cert.public_key_file,
+ '-extfile', ext_file, '-infiles', csr_file)
+ finally:
+ shutil.rmtree(tmpdir)
+
v.licheni.net / stack / cam.git / commitdiff