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#!/usr/bin/env python
""" helper for encrypting/decrypting Cfg and Properties files """
import os
import sys
import logging
import lxml.etree
import Bcfg2.Logger
import Bcfg2.Options
try:
import Bcfg2.Encryption
except ImportError:
err = sys.exc_info()[1]
print("Import failed '%s'. Is M2Crypto installed?" %
err)
raise SystemExit(1)
LOGGER = None
def get_logger(verbose=0):
""" set up logging according to the verbose level given on the
command line """
global LOGGER
if LOGGER is None:
LOGGER = logging.getLogger(sys.argv[0])
stderr = logging.StreamHandler()
if verbose:
level = logging.DEBUG
else:
level = logging.WARNING
LOGGER.setLevel(level)
LOGGER.addHandler(stderr)
syslog = logging.handlers.SysLogHandler("/dev/log")
syslog.setFormatter(logging.Formatter("%(name)s: %(message)s"))
LOGGER.addHandler(syslog)
return LOGGER
class Encryptor(object):
def __init__(self, setup):
self.setup = setup
self.logger = get_logger()
self.passphrase = None
self.pname = None
def get_encrypted_filename(self, plaintext_filename):
return plaintext_filename
def get_plaintext_filename(self, encrypted_filename):
return encrypted_filename
def chunk(self, data):
yield data
def unchunk(self, data, original):
return data[0]
def set_passphrase(self):
if (not self.setup.cfp.has_section("encryption") or
self.setup.cfp.options("encryption") == 0):
self.logger.error("No passphrases available in %s" %
self.setup['configfile'])
return False
if self.passphrase:
self.logger.debug("Using previously determined passphrase %s" %
self.pname)
return True
if self.setup['passphrase']:
self.pname = self.setup['passphrase']
if self.pname:
if self.setup.cfp.has_option("encryption", self.pname):
self.passphrase = self.setup.cfp.get("encryption",
self.pname)
self.logger.debug("Using passphrase %s specified on command "
"line" % self.pname)
return True
else:
self.logger.error("Could not find passphrase %s in %s" %
(self.pname, self.setup['configfile']))
return False
else:
pnames = self.setup.cfp.options("encryption")
if len(pnames) == 1:
self.passphrase = self.setup.cfp.get(pnames[0])
self.pname = pnames[0]
self.logger.info("Using passphrase %s" % pnames[0])
return True
self.logger.info("No passphrase could be determined")
return False
def encrypt(self, fname):
try:
plaintext = open(fname).read()
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error reading %s, skipping: %s" % (fname, err))
return False
self.set_passphrase()
crypted = []
for chunk in self.chunk(plaintext):
try:
passphrase, pname = self.get_passphrase(chunk)
except TypeError:
return False
crypted.append(self._encrypt(chunk, passphrase, name=pname))
new_fname = self.get_encrypted_filename(fname)
try:
open(new_fname, "wb").write(self.unchunk(crypted, plaintext))
self.logger.info("Wrote encrypted data to %s" % new_fname)
return True
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error writing encrypted data from %s to %s: %s" %
(fname, new_fname, err))
return False
def _encrypt(self, plaintext, passphrase, name=None):
return Bcfg2.Encryption.ssl_encrypt(plaintext, passphrase)
def decrypt(self, fname):
try:
crypted = open(fname).read()
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error reading %s, skipping: %s" % (fname, err))
return False
self.set_passphrase()
plaintext = []
for chunk in self.chunk(crypted):
try:
passphrase, pname = self.get_passphrase(chunk)
try:
plaintext.append(self._decrypt(chunk, passphrase))
except Bcfg2.Encryption.EVPError:
self.logger.info("Could not decrypt %s with the specified "
"passphrase" % fname)
return False
except:
err = sys.exc_info()[1]
self.logger.error("Error decrypting %s: %s" % (fname, err))
return False
except TypeError:
pchunk = None
for pname in self.setup.cfp.options('encryption'):
self.logger.debug("Trying passphrase %s" % pname)
passphrase = self.setup.cfp.get('encryption', pname)
try:
pchunk = self._decrypt(chunk, passphrase)
break
except Bcfg2.Encryption.EVPError:
pass
except:
err = sys.exc_info()[1]
self.logger.error("Error decrypting %s: %s" %
(fname, err))
if pchunk is not None:
plaintext.append(pchunk)
else:
self.logger.error("Could not decrypt %s with any "
"passphrase in %s" %
(fname, self.setup['configfile']))
return False
new_fname = self.get_plaintext_filename(fname)
try:
open(new_fname, "wb").write(self.unchunk(plaintext, crypted))
self.logger.info("Wrote decrypted data to %s" % new_fname)
return True
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error writing encrypted data from %s to %s: %s" %
(fname, new_fname, err))
return False
def get_passphrase(self, chunk):
pname = self._get_passphrase(chunk)
if not self.pname:
if not pname:
self.logger.info("No passphrase given on command line or "
"found in file")
return False
elif self.setup.cfp.has_option("encryption", pname):
passphrase = self.setup.cfp.get("encryption", pname)
else:
self.logger.error("Could not find passphrase %s in %s" %
(pname, self.setup['configfile']))
return False
else:
pname = self.pname
passphrase = self.passphrase
if self.pname != pname:
self.logger.warning("Passphrase given on command line (%s) "
"differs from passphrase embedded in "
"file (%s), using command-line option" %
(self.pname, pname))
return (passphrase, pname)
def _get_passphrase(self, chunk):
return None
def _decrypt(self, crypted, passphrase):
return Bcfg2.Encryption.ssl_decrypt(crypted, passphrase)
class CfgEncryptor(Encryptor):
def get_encrypted_filename(self, plaintext_filename):
return plaintext_filename + ".crypt"
def get_plaintext_filename(self, encrypted_filename):
if encrypted_filename.endswith(".crypt"):
return encrypted_filename[:-6]
else:
return Encryptor.get_plaintext_filename(self, encrypted_filename)
class PropertiesEncryptor(Encryptor):
def _encrypt(self, plaintext, passphrase, name=None):
# plaintext is an lxml.etree._Element
if name is None:
name = "true"
if plaintext.text and plaintext.text.strip():
plaintext.text = Bcfg2.Encryption.ssl_encrypt(plaintext.text,
passphrase)
plaintext.set("encrypted", name)
return plaintext
def chunk(self, data):
xdata = lxml.etree.XML(data)
if self.setup['xpath']:
elements = xdata.xpath(self.setup['xpath'])
else:
elements = xdata.xpath('//*[@encrypted]')
if not elements:
elements = list(xdata.getiterator())
# this is not a good use of a generator, but we need to
# generate the full list of elements in order to ensure that
# some exist before we know what to return
for elt in elements:
yield elt
def unchunk(self, data, original):
# Properties elements are modified in-place, so we don't
# actually need to unchunk anything
xdata = data[0]
# find root element
while xdata.getparent() != None:
xdata = xdata.getparent()
xdata.set("encryption", "true")
return lxml.etree.tostring(xdata, encoding='unicode')
def _get_passphrase(self, chunk):
pname = chunk.get("encrypted") or chunk.get("encryption")
if pname and pname.lower() != "true":
return pname
return None
def _decrypt(self, crypted, passphrase):
# crypted is in lxml.etree._Element
if not crypted.text or not crypted.text.strip():
self.logger.warning("Skipping empty element %s" % crypted.tag)
return crypted
rv = Bcfg2.Encryption.ssl_decrypt(crypted.text, passphrase)
crypted.text = rv
return crypted
def main():
optinfo = dict()
optinfo.update(Bcfg2.Options.CRYPT_OPTIONS)
optinfo.update(Bcfg2.Options.CLI_COMMON_OPTIONS)
setup = Bcfg2.Options.OptionParser(optinfo)
setup.hm = " bcfg2-crypt [options] <filename>\nOptions:\n%s" % \
setup.buildHelpMessage()
setup.parse(sys.argv[1:])
if not setup['args']:
print(setup.hm)
raise SystemExit(1)
elif setup['encrypt'] and setup['decrypt']:
print("You cannot specify both --encrypt) and --decrypt")
raise SystemExit(1)
elif setup['cfg'] and setup['properties']:
print("You cannot specify both --cfg and --properties")
raise SystemExit(1)
elif setup['cfg'] and setup['properties']:
print("Specifying --xpath with --cfg is nonsensical, ignoring --xpath")
setup['xpath'] = Bcfg2.Options.CRYPT_XPATH.default
elif setup['decrypt'] and setup['remove']:
print("--remove cannot be used with --decrypt, ignoring")
setup['remove'] = Bcfg2.Options.CRYPT_REMOVE.default
logger = get_logger(setup['verbose'])
props_crypt = PropertiesEncryptor(setup)
cfg_crypt = CfgEncryptor(setup)
for fname in setup['args']:
if not os.path.exists(fname):
logger.error("%s does not exist, skipping" % fname)
continue
# figure out if we need to encrypt this as a Properties file
# or as a Cfg file
props = False
if setup['properties']:
props = True
elif setup['cfg']:
props = False
elif fname.endswith(".xml"):
try:
xroot = lxml.etree.parse(fname).getroot()
if xroot.tag == "Properties":
props = True
else:
props = False
except IOError:
err = sys.exc_info()[1]
logger.error("Error reading %s, skipping: %s" % (fname, err))
continue
except lxml.etree.XMLSyntaxError:
props = False
else:
props = False
if props:
encryptor = props_crypt
else:
encryptor = cfg_crypt
if setup['encrypt']:
if not encryptor.encrypt(fname):
print("Failed to encrypt %s, skipping" % fname)
elif setup['decrypt']:
if not encryptor.decrypt(fname):
print("Failed to decrypt %s, skipping" % fname)
else:
logger.info("Neither --encrypt nor --decrypt specified, "
"determining mode")
if not encryptor.decrypt(fname):
logger.info("Failed to decrypt %s, trying encryption" % fname)
if not encryptor.encrypt(fname):
print("Failed to encrypt %s, skipping" % fname)
if setup['remove'] and encryptor.get_encrypted_filename(fname) != fname:
try:
os.unlink(fname)
except IOError:
err = sys.exc_info()[1]
logger.error("Error removing %s: %s" % (fname, err))
continue
if __name__ == '__main__':
sys.exit(main())
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