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#!/usr/bin/env python
""" helper for encrypting/decrypting Cfg and Properties files """
import os
import sys
import copy
import logging
import getpass
import lxml.etree
import Bcfg2.Logger
import Bcfg2.Options
import Bcfg2.Encryption
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 encrypt(self, fname):
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
try:
plaintext = open(fname).read()
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error reading %s, skipping: %s" (fname, err))
return False
if not self.passphrase:
self.pname = self.get_passphrase(plaintext)
if self.setup['passphrase']:
if self.pname:
self.logger.warning("Passphrase given on command line "
"differs from passphrase embedded in "
"file, using command-line option")
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)
else:
self.logger.error("Could not find passphrase %s in %s" %
(self.pname, self.setup['configfile']))
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])
else:
name = None
while (not name or
not self.setup.cfp.has_option("encryption", name)):
print("Available passphrases: ")
for pname in pnames:
print(pname)
name = raw_input("Passphrase: ")
self.passphrase = self.setup.cfp.get("encryption", name)
self.pname = name
crypted = self._encrypt(plaintext, self.passphrase, name=self.pname)
try:
open(self.get_encrypted_filename(fname), "wb").write(crypted)
self.logger.info("Wrote encrypted data to %s" %
self.get_encrypted_filename(fname))
return True
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error writing encrypted data from %s to %s: %s" %
(fname, self.get_encrypted_filename(fname), err))
return False
def _encrypt(self, plaintext, passphrase, name=None):
return Bcfg2.Encryption.ssl_encrypt(plaintext, passphrase)
def decrypt(self, fname):
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
try:
crypted = open(fname).read()
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error reading %s, skipping: %s" (fname, err))
return False
plaintext = None
pname = self.get_passphrase(crypted)
if pname and self.setup['passphrase']:
self.logger.warning("Passphrase given on command line differs from "
"passphrase embedded in file, using "
"passphrase in file")
self.setup['passphrase'] = None
if self.setup['passphrase']:
pname = self.setup['passphrase']
if not pname:
for pname in self.setup.cfp.options('encryption'):
self.logger.debug("Trying passphrase %s" % pname)
passphrase = self.setup.cfp.get('encryption', pname)
try:
plaintext = self._decrypt(crypted, passphrase)
break
except Bcfg2.Encryption.EVPError:
pass
except:
err = sys.exc_info()[1]
self.logger.error("Error decrypting %s: %s" % (fname, err))
if not plaintext:
self.logger.error("Could not decrypt %s with any passphrase in "
"%s" % (fname, self.setup['configfile']))
return False
else:
if not self.setup.cfp.has_option("encryption", pname):
self.logger.error("Could not find passphrase %s in %s" %
(pname,
self.setup['configfile']))
return False
passphrase = self.setup.cfp.get("encryption", pname)
try:
plaintext = self._decrypt(crypted, passphrase)
except Bcfg2.Encryption.EVPError:
self.logger.error("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
try:
open(self.get_plaintext_filename(fname), "wb").write(plaintext)
self.logger.info("Wrote decrypted data to %s" %
self.get_plaintext_filename(fname))
return True
except IOError:
err = sys.exc_info()[1]
self.logger.error("Error writing encrypted data from %s to %s: %s" %
(fname, self.get_plaintext_filename(fname), err))
return False
def get_passphrase(self, crypted):
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):
xdata = lxml.etree.XML(plaintext)
if self.setup['xpath']:
elements = xdata.xpath(self.setup['xpath'])
else:
elements = xdata.xpath('//*[@encrypted="true"]')
if not elements:
elements = list(xdata.getiterator())
for el in elements:
if el.text and el.text.strip():
el.text = Bcfg2.Encryption.ssl_encrypt(el.text, passphrase)
el.set("encrypted", "true")
if name is None:
xdata.set("encryption", "true")
else:
xdata.set("encryption", name)
return lxml.etree.tostring(xdata)
def get_passphrase(self, crypted):
xdata = lxml.etree.XML(crypted)
pname = xdata.get("encryption")
if pname and pname.lower() != "true":
return pname
return None
def _decrypt(self, crypted, passphrase):
xdata = lxml.etree.XML(crypted)
if self.setup['xpath']:
elements = xdata.xpath(self.setup['xpath'])
else:
elements = xdata.xpath("//*[@encrypted='true']")
if not elements:
self.logger.info("No elements found to decrypt")
return False
for el in elements:
if not el.text.strip():
self.logger.warning("Skipping empty element %s" % el.tag)
continue
el.text = Bcfg2.Encryption.ssl_decrypt(el.text, passphrase)
return lxml.etree.tostring(xdata)
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):
continue
elif setup['decrypt']:
if not encryptor.decrypt(fname):
continue
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):
continue
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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