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commandlets_token.py
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commandlets_token.py
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# SPDX-License-Identifier: BSD-2-Clause
# python stdlib dependencies
import binascii
import io
import sys
# External dependencies
import yaml
# local imports
from .command import Command
from .command import commandlet
from .db import Db
from .utils import check_pss_signature
from .utils import TemporaryDirectory
from .utils import hash_pass
from .utils import rand_hex_str
from .utils import AESAuthUnwrapper
from .utils import load_sealobject
from .utils import str2bool
from .utils import pkcs11_cko_to_str
from .utils import pkcs11_ckk_to_str
from .utils import get_pobject
from .tpm2 import Tpm2
from .pkcs11t import * # noqa
@commandlet("rmtoken")
class RmTokenCommand(Command):
'''
Removes a token from a tpm2-pkcs11 store
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--label', help='The profile label to remove.\n', required=True)
def __call__(self, args):
path = args['path']
label = args['label']
with Db(path) as db:
token = db.gettoken(label)
db.rmtoken(token['label'])
@commandlet("verify")
class VerifyCommand(Command):
'''
Verifies the userpin and/or sopin for a given profile.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--sopin',
help='The Administrator pin. This pin is used for object recovery.\n'
)
group_parser.add_argument(
'--userpin',
help='The user pin. This pin is used for authentication for object use.\n'
)
group_parser.add_argument(
'--label', help='The label to verify.\n', required=True)
group_parser.add_argument(
'--hierarchy-auth',
help='The authorization password for the owner hiearchy when using a token with a transient primary object\n',
default="")
@staticmethod
def verify(db, args):
label = args['label']
token = db.gettoken(label)
if token is None:
sys.exit('No token labeled "%s"' % label)
sopin = args['sopin']
userpin = args['userpin']
hierarchyauth = args['hierarchy_auth']
verify_output = {}
verify_output['label'] = label
pobj = db.getprimary(token['pid'])
sealobj = db.getsealobject(token['id'])
wrappingkeyauth = None
verify_output['config'] = yaml.safe_load(io.StringIO(token['config']))
verify_output['pin'] = {}
with TemporaryDirectory() as d:
tpm2 = Tpm2(d)
pobjauth = pobj['objauth']
pobj_handle = get_pobject(pobj, tpm2, hierarchyauth, d)
if sopin != None:
sosealctx = tpm2.load(pobj_handle, pobjauth,
sealobj['sopriv'], sealobj['sopub'])
# Unseal the wrapping key auth
sosealauthsalt = sealobj['soauthsalt']
sosealauth = hash_pass(sopin, salt=sosealauthsalt)
wrappingkeyauth = tpm2.unseal(sosealctx, sosealauth['hash'])
verify_output['pin']['so'] = {'seal-auth' : sosealauth['hash'] }
if userpin != None:
usersealctx = tpm2.load(pobj_handle, pobjauth,
sealobj['userpriv'],
sealobj['userpub'])
# Unseal the wrapping key auth
usersealauthsalt = sealobj['userauthsalt']
usersealauth = hash_pass(userpin, salt=usersealauthsalt)
wrappingkeyauth = tpm2.unseal(usersealctx,
usersealauth['hash'])
verify_output['pin']['user'] = {'seal-auth' : usersealauth['hash'] }
verify_output['wrappingkey'] = {
'hex' : bytes.hex(wrappingkeyauth),
'auth' : usersealauth['hash']
}
wrapper = AESAuthUnwrapper(wrappingkeyauth)
tobjs = db.gettertiary(token['id'])
verify_output['objects'] = []
for tobj in tobjs:
attrs = yaml.safe_load(tobj['attrs'])
priv=None
if CKA_TPM2_PRIV_BLOB in attrs:
priv = binascii.unhexlify(attrs[CKA_TPM2_PRIV_BLOB])
pub = None
if CKA_TPM2_PUB_BLOB in attrs:
pub = binascii.unhexlify(attrs[CKA_TPM2_PUB_BLOB])
encauth = None
if CKA_TPM2_OBJAUTH_ENC in attrs:
encauth = binascii.unhexlify(attrs[CKA_TPM2_OBJAUTH_ENC])
tobjauth=None
if encauth:
encauth=encauth.decode()
tpm2.load(pobj_handle, pobjauth, priv, pub)
tobjauth = wrapper.unwrap(encauth).decode()
verify_output['objects'].append({
'id: ' : tobj['id'],
'auth: ' : tobjauth,
'encauth' : encauth
})
yaml_dump = yaml.safe_dump(verify_output, default_flow_style=False)
print(yaml_dump)
def __call__(self, args):
if args['userpin'] is None and args['sopin'] is None:
sys.exit("Expected one or both of sopin or userpin")
with Db(args['path']) as db:
VerifyCommand.verify(db, args)
@commandlet("addtoken")
class AddTokenCommand(Command):
'''
Adds an initialized token to a tpm2-pkcs11 store
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--pid',
type=int,
help='The primary object id to associate with this token.\n',
required=True),
group_parser.add_argument(
'--sopin',
help='The Administrator pin. This pin is used for object recovery.\n',
required=True),
group_parser.add_argument(
'--userpin',
help='The user pin. This pin is used for authentication for object use.\n',
required=True),
group_parser.add_argument(
'--label',
help='A unique label to identify the profile in use, must be unique.\n',
required=True)
group_parser.add_argument(
'--hierarchy-auth',
help='The authorization password for the owner hiearchy when using a token with a transient primary object\n',
default="")
@staticmethod
def do_token_init(db, path, args):
userpin = args['userpin']
sopin = args['sopin']
label = args['label']
pid = args['pid']
hierarchyauth = args['hierarchy_auth']
# Verify pid is in db
pobject = db.getprimary(pid)
if not pobject:
raise RuntimeError('No primary object id: %u' % (pid))
with TemporaryDirectory() as d:
tpm2 = Tpm2(d)
# generate a wrapping key to be sealed to the TPM.
# AES 256 key is 32 bytes, or 64 hex chars.
wrappingkey = rand_hex_str(64)
# We generate one auth for the sosealobj and the usersealobj
sosealauth = hash_pass(sopin)
usersealauth = hash_pass(userpin)
# Now we generate the two seal objects, using the sealauths as their
# auth values and sealing the wrappingkey value to it.
# soobject will be an AES key used for decrypting tertiary object
# auth values.
pobj_handle = get_pobject(pobject, tpm2, hierarchyauth, d)
usersealpriv, usersealpub, _ = tpm2.create(
pobj_handle,
pobject['objauth'],
usersealauth['hash'],
seal=wrappingkey)
sosealpriv, sosealpub, _ = tpm2.create(
pobj_handle,
pobject['objauth'],
sosealauth['hash'],
seal=wrappingkey)
pss_sig_good = check_pss_signature(tpm2, pobj_handle, pobject['objauth'])
# If this succeeds, we update the token table
config = {
'token-init': True,
'pss-sigs-good' : pss_sig_good
}
tokid = db.addtoken(pobject['id'], config, label=label)
# now we update the sealobject table with the tokid to seal objects mapping
db.addsealobjects(tokid, usersealauth, usersealpriv, usersealpub,
sosealauth, sosealpriv, sosealpub)
@staticmethod
def do_token_noninit(db, args):
pid = args['pid']
hierarchyauth = args['hierarchy_auth']
with TemporaryDirectory() as d:
tpm2 = Tpm2(d)
pobject = db.getprimary(pid)
pobjauth = pobject['objauth']
pobj_handle = get_pobject(pobject, tpm2, hierarchyauth, d)
pss_sig_good = check_pss_signature(tpm2, pobj_handle, pobjauth)
# If this succeeds, we update the token table
config = {
'token-init': False,
'pss-sigs-good' : pss_sig_good
}
db.addtoken(pobject['id'], config)
def __call__(self, args):
path = args['path']
do_token_init = not args.get('no_init', False)
with Db(path) as db:
if do_token_init:
AddTokenCommand.do_token_init(db, path, args)
else:
AddTokenCommand.do_token_noninit(db, args)
@commandlet("addemptytoken")
class AddEmptyTokenCommand(AddTokenCommand):
'''
Adds an un-initialized token to a tpm2-pkcs11 store.
'''
def generate_options(self, group_parser):
group_parser.add_argument(
'--pid',
type=int,
help='The primary object id to associate with this token.\n',
required=True),
group_parser.add_argument(
'--hierarchy-auth',
help='The authorization password for the owner hiearchy when using a token with a transient primary object\n',
default="")
def __call__(self, args):
args['no_init'] = True
super(AddEmptyTokenCommand, self).__call__(args)
@commandlet("changepin")
class ChangePinCommand(Command):
'''
Changes the userpin and/or sopin for a given token.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--user',
choices=['so', 'user'],
default='user',
help='Which pin to change. Defaults to "user".\n')
group_parser.add_argument(
'--old', type=str, help='The old pin.\n', required=True)
group_parser.add_argument(
'--new', type=str, help='The new pin.\n', required=True)
group_parser.add_argument(
'--label',
type=str,
help='The label of the token.\n',
required=True)
group_parser.add_argument(
'--hierarchy-auth',
help='The authorization password for the owner hiearchy when using a token with a transient primary object\n',
default="")
@staticmethod
def changepin(db, tpm2, args):
label = args['label']
is_so = args['user'] == 'so'
oldpin = args['old']
newpin = args['new']
hierarchyauth = args['hierarchy_auth']
token = db.gettoken(label)
pobjectid = token['pid']
pobject = db.getprimary(pobjectid)
pobjauth = pobject['objauth']
with TemporaryDirectory() as d:
pobj_handle = get_pobject(pobject, tpm2, hierarchyauth, d)
sealctx, sealauth = load_sealobject(token, db, tpm2, pobj_handle, pobjauth,
oldpin, is_so)
newsealauth = hash_pass(newpin)
# call tpm2_changeauth and get new private portion
newsealpriv = tpm2.changeauth(pobj_handle, sealctx, sealauth,
newsealauth['hash'])
# update the database
db.updatepin(is_so, token, newsealauth, newsealpriv)
def __call__(self, args):
path = args['path']
with Db(path) as db:
with TemporaryDirectory() as d:
tpm2 = Tpm2(d)
ChangePinCommand.changepin(db, tpm2, args)
@commandlet("initpin")
class InitPinCommand(Command):
'''
Resets the userpin given a sopin for a given token.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--sopin', type=str, help='The current sopin.\n', required=True)
group_parser.add_argument(
'--userpin', type=str, help='The new user pin.\n', required=True)
group_parser.add_argument(
'--label',
type=str,
help='The label of the token.\n',
required=True)
group_parser.add_argument(
'--hierarchy-auth',
help='The authorization password for the owner hiearchy when using a token with a transient primary object\n',
default="")
@staticmethod
def initpin(db, tpm2, args):
label = args['label']
sopin = args['sopin']
newpin = args['userpin']
token = db.gettoken(label)
# load and unseal the data from the SO seal object
pobjectid = token['pid']
pobject = db.getprimary(pobjectid)
pobjauth = pobject['objauth']
hierarchyauth = args['hierarchy_auth']
with TemporaryDirectory() as d:
pobj_handle = get_pobject(pobject, tpm2, hierarchyauth, d)
sealctx, sealauth = load_sealobject(token, db, tpm2, pobj_handle, pobjauth,
sopin, True)
wrappingkeyauth = tpm2.unseal(sealctx, sealauth)
# call tpm2_create and create a new sealobject protected by the seal auth and sealing
# the wrapping key auth value
newsealauth = hash_pass(newpin)
newsealpriv, newsealpub, _ = tpm2.create(
pobj_handle,
pobjauth,
newsealauth['hash'],
seal=wrappingkeyauth)
# update the database
db.updatepin(False, token, newsealauth, newsealpriv, newsealpub)
def __call__(self, args):
path = args['path']
with Db(path) as db:
with TemporaryDirectory() as d:
tpm2 = Tpm2(d)
InitPinCommand.initpin(db, tpm2, args)
@staticmethod
def _empty_validator(s):
return s
@commandlet("config")
class ConfigCommand(Command):
'''
Manipulates and retrieves token configuration data.
'''
_keys = {
'token-init' : str2bool,
'log-level' : _empty_validator.__func__,
'tcti' : _empty_validator.__func__
}
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--key', type=str, help='The key to set, valid keys are: %s.\n' % self._keys.keys())
group_parser.add_argument(
'--value', type=str, help='The value for the key.\n')
group_parser.add_argument(
'--label',
type=str,
help='The label of the token.\n',
required=True)
@classmethod
def get_validator_for_key(cls, key):
return cls._keys[key]
@classmethod
def config(cls, db, args):
label = args['label']
key = args['key']
value = args['value']
token = db.gettoken(label)
token_config = yaml.safe_load(io.StringIO(token['config']))
if not key and not value:
yaml_tok_cconf = yaml.safe_dump(token_config, default_flow_style=False)
print(yaml_tok_cconf)
sys.exit(0)
if not key and value:
sys.exit("Cannot specify --value without a key")
if key == 'log-level':
print('WARN --key="log-level is deprecated', file=sys.stderr)
# key has to be set here based on above logical check
# throws an error if the key isn't known to the system
validator = cls.get_validator_for_key(key)
# no value, just key. Print the current value for key is set or empty if not set
if not value:
print("%s=%s" % (key, str(token_config[key] if key in token_config else "")))
sys.exit(0)
# bitbucket log-level sets
if key == 'log-level':
print('WARN --key="log-level is ignored', file=sys.stderr)
return
v = validator(value)
token_config[key] = v
# update the database
db.updateconfig(token, token_config)
def __call__(self, args):
path = args['path']
with Db(path) as db:
ConfigCommand.config(db, args)
@commandlet("listprimaries")
class ListPrimaryCommand(Command):
'''
Lists primary objects in a specified store.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
pass
@staticmethod
def list(db):
output=[]
primaries = db.getprimaries()
for p in primaries:
details = {'id': p['id']}
details['config'] = yaml.safe_load(p['config'])
output.append(details)
if len(output):
print(yaml.safe_dump(output, default_flow_style=False))
def __call__(self, args):
path = args['path']
with Db(path) as db:
ListPrimaryCommand.list(db)
@commandlet("listtokens")
class ListTokenCommand(Command):
'''
Lists tokens in a specified store.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--pid',
type=int,
help='The primary object id to associate with this token.\n',
required=True),
@staticmethod
def list(db, args):
output = []
tokens = db.gettokens(args['pid'])
for t in tokens:
output.append({
'id': t['id'],
'label': t['label']
})
if len(output):
print(yaml.safe_dump(output, default_flow_style=False))
def __call__(self, args):
path = args['path']
with Db(path) as db:
ListTokenCommand.list(db, args)
@commandlet("listobjects")
class ListObjectsCommand(Command):
'''
Lists Objects (keys, certificates, etc.) associated with a token.
'''
# adhere to an interface
# pylint: disable=no-self-use
def generate_options(self, group_parser):
group_parser.add_argument(
'--label',
type=str,
help='The label of the token.\n',
required=True)
@staticmethod
def list(db, args):
output = []
token = db.gettoken(args['label'])
objects = db.getobjects(token['id'])
for o in objects:
y = yaml.safe_load(o['attrs'])
d = {
'id': o['id'],
'CKA_LABEL' : binascii.unhexlify(y[CKA_LABEL]).decode(),
'CKA_CLASS' : pkcs11_cko_to_str(y[CKA_CLASS]),
}
if CKA_ID in y:
d['CKA_ID'] = y[CKA_ID],
if CKA_KEY_TYPE in y:
d['CKA_KEY_TYPE'] = pkcs11_ckk_to_str(y[CKA_KEY_TYPE])
output.append(d)
if len(output):
print(yaml.safe_dump(output, default_flow_style=False))
def __call__(self, args):
path = args['path']
with Db(path) as db:
ListObjectsCommand.list(db, args)