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freeipa/ipalib/plugins/host.py
T
Rob Crittenden 4ad8055341 Re-implement access control using an updated model. 
The new model is based on permssions, privileges and roles.
Most importantly it corrects the reverse membership that caused problems
in the previous implementation. You add permission to privileges and
privileges to roles, not the other way around (even though it works that
way behind the scenes).

A permission object is a combination of a simple group and an aci.
The linkage between the aci and the permission is the description of
the permission. This shows as the name/description of the aci.

ldap:///self and groups granting groups (v1-style) are not supported by
this model (it will be provided separately).

This makes the aci plugin internal only.

ticket 445
2010-12-01 20:42:31 -05:00

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# Authors:
# Rob Crittenden <rcritten@redhat.com>
# Pavel Zuna <pzuna@redhat.com>
#
# Copyright (C) 2008 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; version 2 only
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
Hosts/Machines
A host represents a machine. It can be used in a number of contexts:
- service entries are associated with a host
- a host stores the host/ service principal
- a host can be used in Host-Based Access Control (HBAC) rules
- every enrolled client generates a host entry
ENROLLMENT:
There are three enrollment scenarios when enrolling a new client:
1. You are enrolling as a full administrator. The host entry may exist
or not. A full administrator is a member of the hostadmin role
or the admins group.
2. You are enrolling as a limited administrator. The host must already
exist. A limited administrator is a member of the enrollhost role.
3. The host has been created with a one-time password.
A host can only be enrolled once. If a client has enrolled and needs to
be re-enrolled, the host entry must be removed and re-created. Note that
re-creating the host entry will result in all services for the host being
removed, and all SSL certificates associated with those services being
revoked.
A host can optionally store information such as where it is located,
the OS that it runs, etc.
EXAMPLES:
Add a new host:
ipa host-add --location="3rd floor lab" --locality=Dallas test.example.com
Delete a host:
ipa host-del test.example.com
Add a new host with a one-time password:
ipa host-add --os='Fedora 12' --password=Secret123 test.example.com
Add a new host with a random one-time password:
ipa host-add --os='Fedora 12' --random test.example.com
Modify information about a host:
ipa host-mod --os='Fedora 12' test.example.com
Disable the host kerberos key:
ipa host-disable test.example.com
Add a host that can manage this host's keytab and certificate:
ipa host-add-managedby --hosts=test2 test
"""
import platform
import os
import sys
from ipalib import api, errors, util
from ipalib import Str, Flag, Bytes
from ipalib.plugins.baseldap import *
from ipalib.plugins.service import split_principal
from ipalib.plugins.service import validate_certificate
from ipalib.plugins.service import normalize_certificate
from ipalib.plugins.service import set_certificate_attrs
from ipalib.plugins.dns import dns_container_exists, _attribute_types
from ipalib import _, ngettext
from ipalib import x509
from ipapython.ipautil import ipa_generate_password
from ipalib.request import context
from ipaserver.install.bindinstance import get_reverse_zone
import base64
import nss.nss as nss
def validate_host(ugettext, fqdn):
"""
Require at least one dot in the hostname (to support localhost.localdomain)
"""
if fqdn.find('.') == -1:
return _('Fully-qualified hostname required')
return None
host_output_params = (
Flag('has_keytab',
label=_('Keytab'),
),
Str('managedby_host',
label='Managed by',
),
Str('subject',
label=_('Subject'),
),
Str('serial_number',
label=_('Serial Number'),
),
Str('issuer',
label=_('Issuer'),
),
Str('valid_not_before',
label=_('Not Before'),
),
Str('valid_not_after',
label=_('Not After'),
),
Str('md5_fingerprint',
label=_('Fingerprint (MD5)'),
),
Str('sha1_fingerprint',
label=_('Fingerprint (SHA1)'),
),
Str('revocation_reason?',
label=_('Revocation reason'),
)
)
def validate_ipaddr(ugettext, ipaddr):
"""
Verify that we have either an IPv4 or IPv6 address.
"""
if not util.validate_ipaddr(ipaddr):
return _('invalid IP address')
return None
class host(LDAPObject):
"""
Host object.
"""
container_dn = api.env.container_host
object_name = 'host'
object_name_plural = 'hosts'
object_class = ['ipaobject', 'nshost', 'ipahost', 'pkiuser', 'ipaservice']
# object_class_config = 'ipahostobjectclasses'
search_attributes = [
'fqdn', 'description', 'l', 'nshostlocation', 'krbprincipalname',
'nshardwareplatform', 'nsosversion', 'managedby'
]
default_attributes = [
'fqdn', 'description', 'l', 'nshostlocation', 'krbprincipalname',
'nshardwareplatform', 'nsosversion', 'usercertificate', 'memberof',
'krblastpwdchange', 'managedby'
]
uuid_attribute = 'ipauniqueid'
attribute_members = {
'enrolledby': ['user'],
'memberof': ['hostgroup', 'netgroup', 'role'],
'managedby': ['host'],
}
label = _('Hosts')
takes_params = (
Str('fqdn', validate_host,
cli_name='hostname',
label=_('Host name'),
primary_key=True,
normalizer=lambda value: value.lower(),
),
Str('description?',
cli_name='desc',
label=_('Description'),
doc=_('A description of this host'),
),
Str('l?',
cli_name='locality',
label=_('Locality'),
doc=_('Host locality (e.g. "Baltimore, MD")'),
),
Str('nshostlocation?',
cli_name='location',
label=_('Location'),
doc=_('Host location (e.g. "Lab 2")'),
),
Str('nshardwareplatform?',
cli_name='platform',
label=_('Platform'),
doc=_('Host hardware platform (e.g. "Lenovo T61")'),
),
Str('nsosversion?',
cli_name='os',
label=_('Operating system'),
doc=_('Host operating system and version (e.g. "Fedora 9")'),
),
Str('userpassword?',
cli_name='password',
label=_('User password'),
doc=_('Password used in bulk enrollment'),
),
Flag('random?',
doc=_('Generate a random password to be used in bulk enrollment'),
flags=['no_search'],
default=False,
),
Str('randompassword?',
label=_('Random password'),
flags=['no_create', 'no_update', 'no_search'],
),
Bytes('usercertificate?', validate_certificate,
cli_name='certificate',
label=_('Certificate'),
doc=_('Base-64 encoded server certificate'),
),
Str('krbprincipalname?',
label=_('Principal name'),
flags=['no_create', 'no_update', 'no_search'],
),
)
def get_dn(self, *keys, **options):
if keys[-1].endswith('.'):
keys[-1] = keys[-1][:-1]
dn = super(host, self).get_dn(*keys, **options)
try:
self.backend.get_entry(dn, [''])
except errors.NotFound:
try:
(dn, entry_attrs) = self.backend.find_entry_by_attr(
'serverhostname', keys[-1], self.object_class, [''],
self.container_dn
)
except errors.NotFound:
pass
return dn
api.register(host)
class host_add(LDAPCreate):
"""
Add a new host.
"""
has_output_params = LDAPCreate.has_output_params + host_output_params
msg_summary = _('Added host "%(value)s"')
member_attributes = ['managedby']
takes_options = (
Flag('force',
doc=_('force host name even if not in DNS'),
),
Str('ipaddr?', validate_ipaddr,
doc=_('Add the host to DNS with this IP address'),
),
)
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
if 'ipaddr' in options and dns_container_exists(ldap):
parts = keys[-1].split('.')
domain = unicode('.'.join(parts[1:]))
result = api.Command['dns_find']()['result']
match = False
for zone in result:
if domain == zone['idnsname'][0]:
match = True
break
if not match:
raise errors.NotFound(reason=_('DNS zone %(zone)s not found' % dict(zone=domain)))
revzone, revname = get_reverse_zone(options['ipaddr'])
# Verify that our reverse zone exists
match = False
for zone in result:
if revzone == zone['idnsname'][0]:
match = True
break
if not match:
raise errors.NotFound(reason=_('Reverse DNS zone %(zone)s not found' % dict(zone=revzone)))
try:
reverse = api.Command['dns_find_rr'](revzone, revname)
if reverse['count'] > 0:
raise errors.DuplicateEntry(message=u'This IP address is already assigned.')
except errors.NotFound:
pass
if not options.get('force', False) and not 'ipaddr' in options:
util.validate_host_dns(self.log, keys[-1])
if 'locality' in entry_attrs:
entry_attrs['l'] = entry_attrs['locality']
del entry_attrs['locality']
entry_attrs['cn'] = keys[-1]
entry_attrs['serverhostname'] = keys[-1].split('.', 1)[0]
if 'userpassword' not in entry_attrs and \
options.get('random', False) == False:
entry_attrs['krbprincipalname'] = 'host/%s@%s' % (
keys[-1], self.api.env.realm
)
if 'krbprincipalaux' not in entry_attrs['objectclass']:
entry_attrs['objectclass'].append('krbprincipalaux')
entry_attrs['objectclass'].append('krbprincipal')
elif 'krbprincipalaux' in entry_attrs['objectclass']:
entry_attrs['objectclass'].remove('krbprincipalaux')
if 'random' in options:
if options.get('random'):
entry_attrs['userpassword'] = ipa_generate_password()
# save the password so it can be displayed in post_callback
setattr(context, 'randompassword', entry_attrs['userpassword'])
del entry_attrs['random']
entry_attrs['managedby'] = dn
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
exc = None
try:
if 'ipaddr' in options and dns_container_exists(ldap):
parts = keys[-1].split('.')
domain = unicode('.'.join(parts[1:]))
if ':' in options['ipaddr']:
type = u'AAAA'
else:
type = u'A'
try:
api.Command['dns_add_rr'](domain, parts[0], type, options['ipaddr'])
except errors.EmptyModlist:
# the entry already exists and matches
pass
revzone, revname = get_reverse_zone(options['ipaddr'])
try:
api.Command['dns_add_rr'](revzone, revname, u'PTR', keys[-1]+'.')
except errors.EmptyModlist:
# the entry already exists and matches
pass
del options['ipaddr']
except Exception, e:
exc = e
if options.get('random', False):
try:
entry_attrs['randompassword'] = unicode(getattr(context, 'randompassword'))
except AttributeError:
# On the off-chance some other extension deletes this from the
# context, don't crash.
pass
if exc:
raise errors.NonFatalError(reason=_('The host was added but the DNS update failed with: %(exc)s' % dict(exc=exc)))
set_certificate_attrs(entry_attrs)
return dn
api.register(host_add)
class host_del(LDAPDelete):
"""
Delete a host.
"""
msg_summary = _('Deleted host "%(value)s"')
member_attributes = ['managedby']
takes_options = LDAPCreate.takes_options + (
Flag('updatedns?',
doc=_('Remove entries from DNS'),
default=False,
),
)
def pre_callback(self, ldap, dn, *keys, **options):
# If we aren't given a fqdn, find it
if validate_host(None, keys[-1]) is not None:
hostentry = api.Command['host_show'](keys[-1])['result']
fqdn = hostentry['fqdn'][0]
else:
fqdn = keys[-1]
# Remove all service records for this host
truncated = True
while truncated:
try:
ret = api.Command['service_find'](fqdn)
truncated = ret['truncated']
services = ret['result']
except errors.NotFound:
break
else:
for entry_attrs in services:
principal = entry_attrs['krbprincipalname'][0]
(service, hostname, realm) = split_principal(principal)
if hostname.lower() == fqdn:
api.Command['service_del'](principal)
updatedns = options.get('updatedns', False)
if updatedns:
try:
updatedns = dns_container_exists(ldap)
except errors.NotFound:
updatedns = False
if updatedns:
# Remove DNS entries
parts = fqdn.split('.')
domain = unicode('.'.join(parts[1:]))
result = api.Command['dns_find']()['result']
match = False
for zone in result:
if domain == zone['idnsname'][0]:
match = True
break
if not match:
raise errors.NotFound(reason=_('DNS zone %(zone)s not found' % dict(zone=domain)))
raise e
# Get all forward resources for this host
records = api.Command['dns_find_rr'](domain, parts[0])['result']
for record in records:
if 'arecord' in record:
ipaddr = record['arecord'][0]
self.debug('deleting ipaddr %s' % ipaddr)
revzone, revname = get_reverse_zone(ipaddr)
try:
api.Command['dns_del_rr'](revzone, revname, u'PTR', fqdn+'.')
except errors.NotFound:
pass
try:
api.Command['dns_del_rr'](domain, parts[0], u'A', ipaddr)
except errors.NotFound:
pass
else:
# Try to delete all other record types too
for attr in _attribute_types:
if attr != 'arecord' and attr in record:
for i in xrange(len(record[attr])):
if (record[attr][i].endswith(parts[0]) or
record[attr][i].endswith(fqdn+'.')):
api.Command['dns_del_rr'](domain,
record['idnsname'][0],
_attribute_types[attr], record[attr][i])
break
(dn, entry_attrs) = ldap.get_entry(dn, ['usercertificate'])
if 'usercertificate' in entry_attrs:
cert = normalize_certificate(entry_attrs.get('usercertificate')[0])
try:
serial = unicode(x509.get_serial_number(cert, x509.DER))
try:
result = api.Command['cert_show'](unicode(serial))['result'
]
if 'revocation_reason' not in result:
try:
api.Command['cert_revoke'](unicode(serial), revocation_reason=4)
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except NSPRError, nsprerr:
if nsprerr.errno == -8183:
# If we can't decode the cert them proceed with
# removing the host.
self.log.info("Problem decoding certificate %s" % nsprerr.args[1])
else:
raise nsprerr
return dn
api.register(host_del)
class host_mod(LDAPUpdate):
"""
Modify information about a host.
"""
has_output_params = LDAPUpdate.has_output_params + host_output_params
msg_summary = _('Modified host "%(value)s"')
member_attributes = ['managedby']
takes_options = LDAPUpdate.takes_options + (
Str('krbprincipalname?',
cli_name='principalname',
label=_('Principal name'),
doc=_('Kerberos principal name for this host'),
attribute=True,
),
)
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
# Once a principal name is set it cannot be changed
if 'locality' in entry_attrs:
entry_attrs['l'] = entry_attrs['locality']
del entry_attrs['locality']
if 'krbprincipalname' in entry_attrs:
(dn, entry_attrs_old) = ldap.get_entry(
dn, ['objectclass', 'krbprincipalname']
)
if 'krbprincipalname' in entry_attrs_old:
msg = 'Principal name already set, it is unchangeable.'
raise errors.ACIError(info=msg)
obj_classes = entry_attrs_old['objectclass']
if 'krbprincipalaux' not in obj_classes:
obj_classes.append('krbprincipalaux')
entry_attrs['objectclass'] = obj_classes
cert = normalize_certificate(entry_attrs.get('usercertificate'))
if cert:
(dn, entry_attrs_old) = ldap.get_entry(dn, ['usercertificate'])
if 'usercertificate' in entry_attrs_old:
oldcert = normalize_certificate(entry_attrs_old.get('usercertificate')[0])
try:
serial = unicode(x509.get_serial_number(oldcert, x509.DER))
try:
result = api.Command['cert_show'](unicode(serial))['result']
if 'revocation_reason' not in result:
try:
api.Command['cert_revoke'](unicode(serial), revocation_reason=4)
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except NSPRError, nsprerr:
if nsprerr.errno == -8183:
# If we can't decode the cert them proceed with
# modifying the host.
self.log.info("Problem decoding certificate %s" % nsprerr.args[1])
else:
raise nsprerr
entry_attrs['usercertificate'] = cert
if 'random' in options:
if options.get('random'):
entry_attrs['userpassword'] = ipa_generate_password()
setattr(context, 'randompassword', entry_attrs['userpassword'])
del entry_attrs['random']
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
if options.get('random', False):
entry_attrs['randompassword'] = unicode(getattr(context, 'randompassword'))
set_certificate_attrs(entry_attrs)
return dn
api.register(host_mod)
class host_find(LDAPSearch):
"""
Search for hosts.
"""
has_output_params = LDAPSearch.has_output_params + host_output_params
msg_summary = ngettext(
'%(count)d host matched', '%(count)d hosts matched'
)
member_attributes = ['managedby']
def pre_callback(self, ldap, filter, attrs_list, base_dn, scope, *args, **options):
if 'locality' in attrs_list:
attrs_list.remove('locality')
attrs_list.append('l')
return (filter.replace('locality', 'l'), base_dn, scope)
def post_callback(self, ldap, entries, truncated, *args, **options):
for entry in entries:
entry_attrs = entry[1]
set_certificate_attrs(entry_attrs)
api.register(host_find)
class host_show(LDAPRetrieve):
"""
Display information about a host.
"""
has_output_params = LDAPRetrieve.has_output_params + host_output_params
member_attributes = ['managedby']
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
if 'krblastpwdchange' in entry_attrs:
entry_attrs['has_keytab'] = True
if not options.get('all', False):
del entry_attrs['krblastpwdchange']
else:
entry_attrs['has_keytab'] = False
set_certificate_attrs(entry_attrs)
return dn
api.register(host_show)
class host_disable(LDAPQuery):
"""
Disable the kerberos key of a host.
"""
has_output = output.standard_value
msg_summary = _('Removed kerberos key and disabled all services for "%(value)s"')
def execute(self, *keys, **options):
ldap = self.obj.backend
# If we aren't given a fqdn, find it
if validate_host(None, keys[-1]) is not None:
hostentry = api.Command['host_show'](keys[-1])['result']
fqdn = hostentry['fqdn'][0]
else:
fqdn = keys[-1]
# See if we actually do anthing here, and if not raise an exception
done_work = False
dn = self.obj.get_dn(*keys, **options)
(dn, entry_attrs) = ldap.get_entry(dn, ['krblastpwdchange', 'usercertificate'])
truncated = True
while truncated:
try:
ret = api.Command['service_find'](fqdn)
truncated = ret['truncated']
services = ret['result']
except errors.NotFound:
break
else:
for entry_attrs in services:
principal = entry_attrs['krbprincipalname'][0]
(service, hostname, realm) = split_principal(principal)
if hostname.lower() == fqdn:
try:
api.Command['service_disable'](principal)
done_work = True
except errors.AlreadyInactive:
pass
if 'usercertificate' in entry_attrs:
cert = normalize_certificate(entry_attrs.get('usercertificate')[0])
try:
serial = unicode(x509.get_serial_number(cert, x509.DER))
try:
result = api.Command['cert_show'](unicode(serial))['result'
]
if 'revocation_reason' not in result:
try:
api.Command['cert_revoke'](unicode(serial), revocation_reason=4)
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except errors.NotImplementedError:
# some CA's might not implement revoke
pass
except NSPRError, nsprerr:
if nsprerr.errno == -8183:
# If we can't decode the cert them proceed with
# disabling the host.
self.log.info("Problem decoding certificate %s" % nsprerr.args[1])
else:
raise nsprerr
# Remove the usercertificate altogether
ldap.update_entry(dn, {'usercertificate': None})
done_work = True
if 'krblastpwdchange' in entry_attrs:
ldap.remove_principal_key(dn)
api.Command['host_mod'](fqdn=keys[-1], setattr=u'enrolledby=')
done_work = True
if not done_work:
raise errors.AlreadyInactive()
return dict(
result=True,
value=keys[0],
)
api.register(host_disable)
class host_add_managedby(LDAPAddMember):
"""
Add hosts that can manage this host.
"""
member_attributes = ['managedby']
has_output_params = LDAPAddMember.has_output_params + host_output_params
api.register(host_add_managedby)
class host_remove_managedby(LDAPRemoveMember):
"""
Remove hosts that can manage this host.
"""
member_attributes = ['managedby']
has_output_params = LDAPRemoveMember.has_output_params + host_output_params
api.register(host_remove_managedby)
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