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freeipa/ipaserver/plugins/otptoken.py
Alexander Bokovoy b47d6a3654 use LDAP Whoami command when creating an OTP token 
ipa user-find --whoami is used by ipa otptoken-add to populate
ipaTokenOwner and managedBy attributes. These attributes, in turn are
checked by the self-service ACI which allows to create OTP tokens
assigned to the creator.

With 389-ds-base 1.4.0.6-2.fc28 in Fedora 28 beta there is a bug in
searches with scope 'one' that result in ipa user-find --whoami
returning 0 results.

Because ipa user-find --whoami does not work, non-admin user cannot
create a token. This is a regression that can be fixed by using LDAP
Whoami command.

LDAP Whoami command returns a string 'dn: <DN of the bind>', so we have
to strip first four characters to get actual DN.

Fixes: https://pagure.io/freeipa/issue/7456
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
2018-03-22 11:33:17 +01:00

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# Authors:
# Nathaniel McCallum <npmccallum@redhat.com>
#
# Copyright (C) 2013 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from .baseldap import LDAPObject, LDAPAddMember, LDAPRemoveMember
from .baseldap import LDAPCreate, LDAPDelete, LDAPUpdate, LDAPSearch, LDAPRetrieve
from ipalib import api, Int, Str, Bool, DateTime, Flag, Bytes, IntEnum, StrEnum, _, ngettext
from ipalib.plugable import Registry
from ipalib.errors import (
PasswordMismatch,
ConversionError,
NotFound,
ValidationError)
from ipalib.request import context
from ipapython.dn import DN
import base64
import uuid
import os
import six
from six.moves import urllib
if six.PY3:
unicode = str
__doc__ = _("""
OTP Tokens
""") + _("""
Manage OTP tokens.
""") + _("""
IPA supports the use of OTP tokens for multi-factor authentication. This
code enables the management of OTP tokens.
""") + _("""
EXAMPLES:
""") + _("""
Add a new token:
ipa otptoken-add --type=totp --owner=jdoe --desc="My soft token"
""") + _("""
Examine the token:
ipa otptoken-show a93db710-a31a-4639-8647-f15b2c70b78a
""") + _("""
Change the vendor:
ipa otptoken-mod a93db710-a31a-4639-8647-f15b2c70b78a --vendor="Red Hat"
""") + _("""
Delete a token:
ipa otptoken-del a93db710-a31a-4639-8647-f15b2c70b78a
""")
register = Registry()
topic = 'otp'
TOKEN_TYPES = {
u'totp': ['ipatokentotpclockoffset', 'ipatokentotptimestep'],
u'hotp': ['ipatokenhotpcounter']
}
# NOTE: For maximum compatibility, KEY_LENGTH % 5 == 0
KEY_LENGTH = 35
class OTPTokenKey(Bytes):
"""A binary password type specified in base32."""
password = True
def _convert_scalar(self, value, index=None):
if isinstance(value, (tuple, list)) and len(value) == 2:
(p1, p2) = value
if p1 != p2:
raise PasswordMismatch(name=self.name)
value = p1
if isinstance(value, unicode):
try:
value = base64.b32decode(value, True)
except TypeError as e:
raise ConversionError(name=self.name, error=str(e))
return super(OTPTokenKey, self)._convert_scalar(value)
def _convert_owner(userobj, entry_attrs, options):
if 'ipatokenowner' in entry_attrs and not options.get('raw', False):
entry_attrs['ipatokenowner'] = [userobj.get_primary_key_from_dn(o)
for o in entry_attrs['ipatokenowner']]
def _normalize_owner(userobj, entry_attrs):
owner = entry_attrs.get('ipatokenowner', None)
if owner:
try:
entry_attrs['ipatokenowner'] = userobj._normalize_manager(
owner
)[0]
except NotFound:
raise userobj.handle_not_found(owner)
def _check_interval(not_before, not_after):
if not_before and not_after:
return not_before <= not_after
return True
def _set_token_type(entry_attrs, **options):
klasses = [x.lower() for x in entry_attrs.get('objectclass', [])]
for ttype in TOKEN_TYPES:
cls = 'ipatoken' + ttype
if cls.lower() in klasses:
entry_attrs['type'] = ttype.upper()
if not options.get('all', False) or options.get('pkey_only', False):
entry_attrs.pop('objectclass', None)
@register()
class otptoken(LDAPObject):
"""
OTP Token object.
"""
container_dn = api.env.container_otp
object_name = _('OTP token')
object_name_plural = _('OTP tokens')
object_class = ['ipatoken']
possible_objectclasses = ['ipatokentotp', 'ipatokenhotp']
default_attributes = [
'ipatokenuniqueid', 'description', 'ipatokenowner',
'ipatokendisabled', 'ipatokennotbefore', 'ipatokennotafter',
'ipatokenvendor', 'ipatokenmodel', 'ipatokenserial', 'managedby'
]
attribute_members = {
'managedby': ['user'],
}
relationships = {
'managedby': ('Managed by', 'man_by_', 'not_man_by_'),
}
allow_rename = True
label = _('OTP Tokens')
label_singular = _('OTP Token')
takes_params = (
Str('ipatokenuniqueid',
cli_name='id',
label=_('Unique ID'),
primary_key=True,
flags=('optional_create'),
),
StrEnum('type?',
label=_('Type'),
doc=_('Type of the token'),
default=u'totp',
autofill=True,
values=tuple(list(TOKEN_TYPES) + [x.upper() for x in TOKEN_TYPES]),
flags=('virtual_attribute', 'no_update'),
),
Str('description?',
cli_name='desc',
label=_('Description'),
doc=_('Token description (informational only)'),
),
Str('ipatokenowner?',
cli_name='owner',
label=_('Owner'),
doc=_('Assigned user of the token (default: self)'),
),
Str('managedby_user?',
label=_('Manager'),
doc=_('Assigned manager of the token (default: self)'),
flags=['no_create', 'no_update', 'no_search'],
),
Bool('ipatokendisabled?',
cli_name='disabled',
label=_('Disabled'),
doc=_('Mark the token as disabled (default: false)')
),
DateTime('ipatokennotbefore?',
cli_name='not_before',
label=_('Validity start'),
doc=_('First date/time the token can be used'),
),
DateTime('ipatokennotafter?',
cli_name='not_after',
label=_('Validity end'),
doc=_('Last date/time the token can be used'),
),
Str('ipatokenvendor?',
cli_name='vendor',
label=_('Vendor'),
doc=_('Token vendor name (informational only)'),
),
Str('ipatokenmodel?',
cli_name='model',
label=_('Model'),
doc=_('Token model (informational only)'),
),
Str('ipatokenserial?',
cli_name='serial',
label=_('Serial'),
doc=_('Token serial (informational only)'),
),
OTPTokenKey('ipatokenotpkey?',
cli_name='key',
label=_('Key'),
doc=_('Token secret (Base32; default: random)'),
default_from=lambda: os.urandom(KEY_LENGTH),
autofill=True,
# force server-side conversion
normalizer=lambda x: x,
flags=('no_display', 'no_update', 'no_search'),
),
StrEnum('ipatokenotpalgorithm?',
cli_name='algo',
label=_('Algorithm'),
doc=_('Token hash algorithm'),
default=u'sha1',
autofill=True,
flags=('no_update'),
values=(u'sha1', u'sha256', u'sha384', u'sha512'),
),
IntEnum('ipatokenotpdigits?',
cli_name='digits',
label=_('Digits'),
doc=_('Number of digits each token code will have'),
values=(6, 8),
default=6,
autofill=True,
flags=('no_update'),
),
Int('ipatokentotpclockoffset?',
cli_name='offset',
label=_('Clock offset'),
doc=_('TOTP token / FreeIPA server time difference'),
default=0,
autofill=True,
flags=('no_update'),
),
Int('ipatokentotptimestep?',
cli_name='interval',
label=_('Clock interval'),
doc=_('Length of TOTP token code validity'),
default=30,
autofill=True,
minvalue=5,
flags=('no_update'),
),
Int('ipatokenhotpcounter?',
cli_name='counter',
label=_('Counter'),
doc=_('Initial counter for the HOTP token'),
default=0,
autofill=True,
minvalue=0,
flags=('no_update'),
),
Str('uri?',
label=_('URI'),
flags={'virtual_attribute', 'no_create', 'no_update', 'no_search'},
),
)
@register()
class otptoken_add(LDAPCreate):
__doc__ = _('Add a new OTP token.')
msg_summary = _('Added OTP token "%(value)s"')
takes_options = LDAPCreate.takes_options + (
Flag('qrcode?', label=_('(deprecated)'), flags=('no_option')),
Flag('no_qrcode', label=_('Do not display QR code'), default=False),
)
def execute(self, ipatokenuniqueid=None, **options):
return super(otptoken_add, self).execute(ipatokenuniqueid, **options)
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
# Fill in a default UUID when not specified.
if entry_attrs.get('ipatokenuniqueid', None) is None:
entry_attrs['ipatokenuniqueid'] = str(uuid.uuid4())
dn = DN("ipatokenuniqueid=%s" % entry_attrs['ipatokenuniqueid'], dn)
if not _check_interval(options.get('ipatokennotbefore', None),
options.get('ipatokennotafter', None)):
raise ValidationError(name='not_after',
error='is before the validity start')
# Set the object class and defaults for specific token types
options['type'] = options['type'].lower()
entry_attrs['objectclass'] = otptoken.object_class + ['ipatoken' + options['type']]
for ttype, tattrs in TOKEN_TYPES.items():
if ttype != options['type']:
for tattr in tattrs:
if tattr in entry_attrs:
del entry_attrs[tattr]
# If owner was not specified, default to the person adding this token.
# If managedby was not specified, attempt a sensible default.
if 'ipatokenowner' not in entry_attrs or 'managedby' not in entry_attrs:
cur_dn = DN(self.api.Backend.ldap2.conn.whoami_s()[4:])
if cur_dn:
cur_uid = cur_dn[0].value
prev_uid = entry_attrs.setdefault('ipatokenowner', cur_uid)
if cur_uid == prev_uid:
entry_attrs.setdefault('managedby', cur_dn.ldap_text())
# Resolve the owner's dn
_normalize_owner(self.api.Object.user, entry_attrs)
# Get the issuer for the URI
owner = entry_attrs.get('ipatokenowner', None)
issuer = api.env.realm
if owner is not None:
try:
issuer = ldap.get_entry(owner, ['krbprincipalname'])['krbprincipalname'][0]
except (NotFound, IndexError):
pass
# Check if key is not empty
if entry_attrs['ipatokenotpkey'] is None:
raise ValidationError(name='key', error=_(u'cannot be empty'))
# Build the URI parameters
args = {}
args['issuer'] = issuer
args['secret'] = base64.b32encode(entry_attrs['ipatokenotpkey'])
args['digits'] = entry_attrs['ipatokenotpdigits']
args['algorithm'] = entry_attrs['ipatokenotpalgorithm'].upper()
if options['type'] == 'totp':
args['period'] = entry_attrs['ipatokentotptimestep']
elif options['type'] == 'hotp':
args['counter'] = entry_attrs['ipatokenhotpcounter']
# Build the URI
label = urllib.parse.quote(entry_attrs['ipatokenuniqueid'])
parameters = urllib.parse.urlencode(args)
uri = u'otpauth://%s/%s:%s?%s' % (options['type'], issuer, label, parameters)
setattr(context, 'uri', uri)
attrs_list.append("objectclass")
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
entry_attrs['uri'] = getattr(context, 'uri')
_set_token_type(entry_attrs, **options)
_convert_owner(self.api.Object.user, entry_attrs, options)
return super(otptoken_add, self).post_callback(ldap, dn, entry_attrs, *keys, **options)
@register()
class otptoken_del(LDAPDelete):
__doc__ = _('Delete an OTP token.')
msg_summary = _('Deleted OTP token "%(value)s"')
@register()
class otptoken_mod(LDAPUpdate):
__doc__ = _('Modify a OTP token.')
msg_summary = _('Modified OTP token "%(value)s"')
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
notafter_set = True
notbefore = options.get('ipatokennotbefore', None)
notafter = options.get('ipatokennotafter', None)
# notbefore xor notafter, exactly one of them is not None
if bool(notbefore) ^ bool(notafter):
result = self.api.Command.otptoken_show(keys[-1])['result']
if notbefore is None:
notbefore = result.get('ipatokennotbefore', [None])[0]
if notafter is None:
notafter_set = False
notafter = result.get('ipatokennotafter', [None])[0]
if not _check_interval(notbefore, notafter):
if notafter_set:
raise ValidationError(name='not_after',
error='is before the validity start')
else:
raise ValidationError(name='not_before',
error='is after the validity end')
_normalize_owner(self.api.Object.user, entry_attrs)
# ticket #4681: if the owner of the token is changed and the
# user also manages this token, then we should automatically
# set the 'managedby' attribute to the new owner
if 'ipatokenowner' in entry_attrs and 'managedby' not in entry_attrs:
new_owner = entry_attrs.get('ipatokenowner', None)
prev_entry = ldap.get_entry(dn, attrs_list=['ipatokenowner',
'managedby'])
prev_owner = prev_entry.get('ipatokenowner', None)
prev_managedby = prev_entry.get('managedby', None)
if (new_owner != prev_owner) and (prev_owner == prev_managedby):
entry_attrs.setdefault('managedby', new_owner)
attrs_list.append("objectclass")
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
_set_token_type(entry_attrs, **options)
_convert_owner(self.api.Object.user, entry_attrs, options)
return super(otptoken_mod, self).post_callback(ldap, dn, entry_attrs, *keys, **options)
@register()
class otptoken_find(LDAPSearch):
__doc__ = _('Search for OTP token.')
msg_summary = ngettext('%(count)d OTP token matched', '%(count)d OTP tokens matched', 0)
def pre_callback(self, ldap, filters, attrs_list, *args, **kwargs):
# This is a hack, but there is no other way to
# replace the objectClass when searching
type = kwargs.get('type', '')
if type not in TOKEN_TYPES:
type = ''
filters = filters.replace("(objectclass=ipatoken)",
"(objectclass=ipatoken%s)" % type)
attrs_list.append("objectclass")
return super(otptoken_find, self).pre_callback(ldap, filters, attrs_list, *args, **kwargs)
def args_options_2_entry(self, *args, **options):
entry = super(otptoken_find, self).args_options_2_entry(*args, **options)
_normalize_owner(self.api.Object.user, entry)
return entry
def post_callback(self, ldap, entries, truncated, *args, **options):
for entry in entries:
_set_token_type(entry, **options)
_convert_owner(self.api.Object.user, entry, options)
return super(otptoken_find, self).post_callback(ldap, entries, truncated, *args, **options)
@register()
class otptoken_show(LDAPRetrieve):
__doc__ = _('Display information about an OTP token.')
def pre_callback(self, ldap, dn, attrs_list, *keys, **options):
attrs_list.append("objectclass")
return super(otptoken_show, self).pre_callback(ldap, dn, attrs_list, *keys, **options)
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
_set_token_type(entry_attrs, **options)
_convert_owner(self.api.Object.user, entry_attrs, options)
return super(otptoken_show, self).post_callback(ldap, dn, entry_attrs, *keys, **options)
@register()
class otptoken_add_managedby(LDAPAddMember):
__doc__ = _('Add users that can manage this token.')
member_attributes = ['managedby']
@register()
class otptoken_remove_managedby(LDAPRemoveMember):
__doc__ = _('Remove users that can manage this token.')
member_attributes = ['managedby']
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