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# |
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# crypto.py |
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# |
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# Copyright (C) 2009 Red Hat, Inc. All rights reserved. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# Author(s): Dave Lehman <dlehman@redhat.com> |
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# Martin Sivak <msivak@redhat.com> |
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# |
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|
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import os |
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from pycryptsetup import CryptSetup |
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import iutil |
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|
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from ..errors import * |
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|
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import gettext |
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_ = lambda x: gettext.ldgettext("anaconda", x) |
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|
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# Keep the character set size a power of two to make sure all characters are |
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# equally likely |
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GENERATED_PASSPHRASE_CHARSET = ("0123456789" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"abcdefghijklmnopqrstuvwxyz" |
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"./") |
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# 20 chars * 6 bits per char = 120 "bits of security" |
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GENERATED_PASSPHRASE_LENGTH = 20 |
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|
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def generateBackupPassphrase(): |
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rnd = os.urandom(GENERATED_PASSPHRASE_LENGTH) |
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cs = GENERATED_PASSPHRASE_CHARSET |
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raw = "".join([cs[ord(c) % len(cs)] for c in rnd]) |
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|
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# Make the result easier to read |
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parts = [] |
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for i in xrange(0, len(raw), 5): |
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parts.append(raw[i : i + 5]) |
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return "-".join(parts) |
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|
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def askyes(question): |
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return True |
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|
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def dolog(priority, text): |
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pass |
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|
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def is_luks(device): |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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return cs.isLuks(device) |
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|
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def luks_uuid(device): |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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return cs.luksUUID(device).strip() |
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|
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def luks_status(name): |
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"""True means active, False means inactive (or non-existent)""" |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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return cs.luksStatus(name)!=0 |
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|
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def luks_format(device, |
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passphrase=None, key_file=None, |
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cipher=None, key_size=None): |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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key_file_unlink = False |
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|
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if passphrase: |
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key_file = cs.prepare_passphrase_file(passphrase) |
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key_file_unlink = True |
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elif key_file and os.path.isfile(key_file): |
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pass |
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else: |
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raise ValueError("luks_format requires either a passphrase or a key file") |
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|
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#None is not considered as default value and pycryptsetup doesn't accept it |
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#so we need to filter out all Nones |
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kwargs = {} |
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kwargs["device"] = device |
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if cipher: kwargs["cipher"] = cipher |
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if key_file: kwargs["keyfile"] = key_file |
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if key_size: kwargs["keysize"] = key_size |
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|
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rc = cs.luksFormat(**kwargs) |
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if key_file_unlink: os.unlink(key_file) |
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|
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if rc: |
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raise CryptoError("luks_format failed for '%s'" % device) |
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|
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def luks_open(device, name, passphrase=None, key_file=None): |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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key_file_unlink = False |
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|
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if passphrase: |
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key_file = cs.prepare_passphrase_file(passphrase) |
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key_file_unlink = True |
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elif key_file and os.path.isfile(key_file): |
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pass |
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else: |
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raise ValueError("luks_open requires either a passphrase or a key file") |
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|
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rc = cs.luksOpen(device = device, name = name, keyfile = key_file) |
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if key_file_unlink: os.unlink(key_file) |
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if rc: |
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raise CryptoError("luks_open failed for %s (%s)" % (device, name)) |
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|
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def luks_close(name): |
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cs = CryptSetup(yesDialog = askyes, logFunc = dolog) |
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rc = cs.luksClose(name) |
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if rc: |
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raise CryptoError("luks_close failed for %s" % name) |
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|
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def luks_add_key(device, |
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new_passphrase=None, new_key_file=None, |
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passphrase=None, key_file=None): |
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|
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params = ["-q"] |
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|
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p = os.pipe() |
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if passphrase: |
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os.write(p[1], "%s\n" % passphrase) |
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elif key_file and os.path.isfile(key_file): |
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params.extend(["--key-file", key_file]) |
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else: |
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raise CryptoError("luks_add_key requires either a passphrase or a key file") |
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|
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params.extend(["luksAddKey", device]) |
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|
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if new_passphrase: |
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os.write(p[1], "%s\n" % new_passphrase) |
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elif new_key_file and os.path.isfile(new_key_file): |
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params.append("%s" % new_key_file) |
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else: |
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raise CryptoError("luks_add_key requires either a passphrase or a key file to add") |
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|
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os.close(p[1]) |
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|
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rc = iutil.execWithRedirect("cryptsetup", params, |
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stdin = p[0], |
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stdout = "/dev/tty5", |
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stderr = "/dev/tty5") |
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|
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os.close(p[0]) |
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if rc: |
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raise CryptoError("luks add key failed with errcode %d" % (rc,)) |
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|
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def luks_remove_key(device, |
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del_passphrase=None, del_key_file=None, |
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passphrase=None, key_file=None): |
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|
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params = [] |
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|
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p = os.pipe() |
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if del_passphrase: #the first question is about the key we want to remove |
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os.write(p[1], "%s\n" % del_passphrase) |
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|
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if passphrase: |
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os.write(p[1], "%s\n" % passphrase) |
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elif key_file and os.path.isfile(key_file): |
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params.extend(["--key-file", key_file]) |
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else: |
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raise CryptoError("luks_remove_key requires either a passphrase or a key file") |
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|
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params.extend(["luksRemoveKey", device]) |
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|
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if del_passphrase: |
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pass |
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elif del_key_file and os.path.isfile(del_key_file): |
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params.append("%s" % del_key_file) |
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else: |
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raise CryptoError("luks_remove_key requires either a passphrase or a key file to remove") |
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|
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os.close(p[1]) |
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|
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rc = iutil.execWithRedirect("cryptsetup", params, |
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stdin = p[0], |
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stdout = "/dev/tty5", |
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stderr = "/dev/tty5") |
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|
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os.close(p[0]) |
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if rc: |
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raise CryptoError("luks_remove_key failed with errcode %d" % (rc,)) |
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|
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