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ipaldap does not take into account the possibility of the attribute
encoding returned by python-ldap differing from the attribute
encoding produced by FreeIPA. In particular this can occur with DNs
with special characters that require escaping. For example,
python-ldap (or the underlying LDAP library) escapes special
characters using hex encoding:
CN=Test Sub-CA 201604041620,OU=ftweedal,O=Red Hat\2C Inc.,L=Brisbane,C=AU
Whereas FreeIPA, when encoding the DN, escapes the character
directly:
CN=Test Sub-CA 201604041620,OU=ftweedal,O=Red Hat\, Inc.,L=Brisbane,C=AU
Therefore it is possible to generate an invalid modlist. For
example, during external CA certificate renewal, if the issuer DN
includes a comma in one of the attribute values (as above), an
invalid modlist will be generated:
[ (ldap.MOD_ADD, 'ipacaissuerdn',
[b'CN=Test Sub-CA 201604041620,OU=ftweedal,O=Red Hat\, Inc.,L=Brisbane,C=AU'])
, (ldap.MOD_DELETE, 'ipacaissuerdn',
[b'CN=Test Sub-CA 201604041620,OU=ftweedal,O=Red Hat\2C Inc.,L=Brisbane,C=AU'])
]
Although encoded differently, these are the same value. If this
modification is applied to the object, attributeOrValueExists (error
20) occurs.
To avoid the issue, put deletes before adds in the modlist. If a
value is present (with different encodings) as both an addition and
a deletion, it must be because the original object contained the
value with a different encoding. Therefore it is safe to delete it,
then add it back.
Note that the modlist is not optimal. In the simplest case (like
above example), there should be no modification to perform. It is
considerably more complex (and more computation) to implement this
because the raw attribute values must be decoded before comparison.
Fixes: https://pagure.io/freeipa/issue/7750
Reviewed-By: Christian Heimes <cheimes@redhat.com>
FreeIPA Server
FreeIPA allows Linux administrators to centrally manage identity, authentication and access control aspects of Linux and UNIX systems by providing simple to install and use command line and web based management tools.
FreeIPA is built on top of well known Open Source components and standard protocols with a very strong focus on ease of management and automation of installation and configuration tasks.
FreeIPA can seamlessly integrate into an Active Directory environment via cross-realm Kerberos trust or user synchronization.
Benefits
FreeIPA:
- Allows all your users to access all the machines with the same credentials and security settings
- Allows users to access personal files transparently from any machine in an authenticated and secure way
- Uses an advanced grouping mechanism to restrict network access to services and files only to specific users
- Allows central management of security mechanisms like passwords, SSH Public Keys, SUDO rules, Keytabs, Access Control Rules
- Enables delegation of selected administrative tasks to other power users
- Integrates into Active Directory environments
Components
The FreeIPA project provides unified installation and management tools for the following components:
- LDAP Server - based on the 389 project
- KDC - based on MIT Kerberos implementation
- PKI based on Dogtag project
- Samba libraries for Active Directory integration
- DNS Server based on BIND and the Bind-DynDB-LDAP plugin
Project Website
Releases, announcements and other information can be found on the IPA server project page at http://www.freeipa.org/ .
Documentation
The most up-to-date documentation can be found at http://freeipa.org/page/Documentation .
Quick Start
To get started quickly, start here: http://www.freeipa.org/page/Quick_Start_Guide
For developers
- Building FreeIPA from source
- http://www.freeipa.org/page/Build
- See the BUILD.txt file in the source root directory
Licensing
Please see the file called COPYING.
Contacts
- If you want to be informed about new code releases, bug fixes, security fixes, general news and information about the IPA server subscribe to the freeipa-announce mailing list at https://www.redhat.com/mailman/listinfo/freeipa-interest/ .
- If you have a bug report please submit it at: https://pagure.io/freeipa/issues
- If you want to participate in actively developing IPA please subscribe to the freeipa-devel mailing list at https://www.redhat.com/mailman/listinfo/freeipa-devel/ or join us in IRC at irc://irc.freenode.net/freeipa