freeipa/ipalib
Christian Heimes 4911a3f055 Prevent local account takeover
It was found that if an account was created with a name corresponding to
an account local to a system, such as 'root', was created via IPA, such
account could access any enrolled machine with that account, and the local
system privileges. This also bypass the absence of explicit HBAC rules.

root principal alias
-------------------

The principal "root@REALM" is now a Kerberos principal alias for
"admin". This prevent user with "User Administrator" role or
"System: Add User" privilege to create an account with "root" principal
name.

Modified user permissions
-------------------------

Several user permissions no longer apply to admin users and filter on
posixaccount object class. This prevents user managers from modifying admin
acounts.

- System: Manage User Certificates
- System: Manage User Principals
- System: Manage User SSH Public Keys
- System: Modify Users
- System: Remove Users
- System: Unlock user

``System: Unlock User`` is restricted because the permission also allow a
user manager to lock an admin account. ``System: Modify Users`` is restricted
to prevent user managers from changing login shell or notification channels
(mail, mobile) of admin accounts.

New user permission
-------------------

- System: Change Admin User password

The new permission allows manipulation of admin user password fields. By
default only the ``PassSync Service`` privilege is allowed to modify
admin user password fields.

Modified group permissions
--------------------------

Group permissions are now restricted as well. Group admins can no longer
modify the admins group and are limited to groups with object class
``ipausergroup``.

- System: Modify Groups
- System: Remove Groups

The permission ``System: Modify Group Membership`` was already limited.

Notes
-----

Admin users are mostly unaffected by the new restrictions, except for
the fact that admins can no longer change krbPrincipalAlias of another
admin or manipulate password fields directly. Commands like ``ipa passwd
otheradmin`` still work, though. The ACI ``Admin can manage any entry``
allows admins to modify other entries and most attributes.

Managed permissions don't install ``obj.permission_filter_objectclasses``
when ``ipapermtargetfilter`` is set. Group and user objects now have a
``permission_filter_objectclasses_string`` attribute that is used
by new target filters.

Misc changes
------------

Also add new exception AlreadyContainsValueError. BaseLDAPAddAttribute
was raising a generic base class for LDAP execution errors.

Fixes: https://pagure.io/freeipa/issue/8326
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1810160
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
2020-06-15 22:44:42 +03:00
..
install httpinstance: retry request without ipa-ca.$DOMAIN dnsName on failure 2020-06-10 22:27:26 +10:00
__init__.py pylint: Clean up comment 2020-02-12 18:08:32 +02:00
aci.py Py3: Replace six.string_types with str 2018-09-27 16:11:18 +02:00
backend.py Fix Pylint 2.0 violations 2018-07-14 12:04:19 +02:00
base.py Py3: Replace six.string_types with str 2018-09-27 16:11:18 +02:00
capabilities.py Replace LooseVersion 2016-11-24 15:46:40 +01:00
cli.py Fix E713 test for membership should be 'not in' 2020-05-05 10:42:46 +02:00
config.py Fix detection logic for api.env.in_tree 2020-05-14 18:16:20 +02:00
constants.py Remove remains of unused config options 2020-06-02 09:39:42 +02:00
crud.py ipalib, ipaserver: fix incorrect API.register calls in docstrings 2016-05-25 16:06:26 +02:00
dns.py dnsrecord-mod: allow to modify ttl without passing the record 2019-07-01 09:16:21 +02:00
errors.py Prevent local account takeover 2020-06-15 22:44:42 +03:00
frontend.py Fixed errors newly exposed by pylint 2.4.0 2019-09-25 20:14:06 +10:00
krb_utils.py Allow login to WebUI using Kerberos aliases/enterprise principals 2017-03-08 15:56:11 +01:00
Makefile.am Build: Makefiles for Python packages 2016-11-09 13:08:32 +01:00
messages.py Handle missing LWCA certificate or chain 2019-06-18 10:36:24 +10:00
misc.py Add fix for ipa plugins command 2017-02-17 10:22:07 +01:00
output.py Generate same API.txt under Python 2 and 3 2018-02-15 09:41:30 +01:00
parameters.py DNParam: raise Exception when multiple values provided to a 1-val param 2019-11-20 11:15:28 +01:00
pkcs10.py Remove pkcs10 module contents 2017-10-25 09:46:41 +02:00
plugable.py Create ipasphinx package for Sphinx plugins 2020-04-28 20:03:21 +02:00
request.py Py3: Remove subclassing from object 2018-09-27 11:49:04 +02:00
rpc.py Fix exception escape warning 2020-04-27 14:59:07 -04:00
setup.cfg Port all setup.py to setuptools 2016-10-20 18:43:37 +02:00
setup.py Cleanup shebang and executable bit 2018-07-05 19:46:42 +02:00
text.py Create ipasphinx package for Sphinx plugins 2020-04-28 20:03:21 +02:00
util.py Fix logic of check_client_configuration 2019-12-05 15:09:38 +01:00
x509.py move MSCSTemplate classes to ipalib 2019-07-17 17:58:58 +03:00