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Alexander Bokovoy
ae7cd4702d
Operations in FIPS mode make impossible use of NTLMSSP when authenticating to trusted Active Directory domain controllers because RC4 cipher is not allowed. Instead, Kerberos authentication have to be used. We switched to enforce Kerberos authentication when communicating with trusted domains' domain controllers everywhere. Kerberos library uses system wide configuration which in IPA defaults to resolving location of KDCs via DNS SRV records. Once trust is established, SSSD will populate a list of closest DCs and provide them through the KDC locator plugin. But at the time the trust is established performing DNS SRV-based discovery of Kerberos KDCs might fail due to multiple reasons. It might also succeed but point to a DC that doesn't know about the account we have to use to establish trust. One edge case is when DNS SRV record points to an unreachable DC, whether due to a firewall or a network topology limitations. In such case an administrator would pass --server <server> option to 'ipa trust-add' or 'ipa trust-fetch-domains' commands. 'ipa trust-fetch-domains' runs a helper via oddjobd. This helper was already modified to support --server option and generated custom krb5.conf overlay to pin to a specific AD DC. However, this configuration was removed as soon as we finished talking to AD DCs. With switch to always use Kebreros to authenticate in retrieval of the topology information, we have to use the overlay everywhere as well. Convert the code that generated the overlay file into a context that generates the overlay and sets environment. Reuse it in other trust-related places where this matters. Oddjob helper runs as root and can write to /run/ipa for the krb5.conf overlay. Server side of 'ipa trust-add' code calls into ipaserver/dcerpc.py and runs under ipaapi so can only write to /tmp. Since it is a part of the Apache instance, it uses private /tmp mounted on tmpfs. Fixes: https://pagure.io/freeipa/issue/8664 Related: https://pagure.io/freeipa/issue/8655 Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-By: Christian Heimes <cheimes@redhat.com> Reviewed-By: Rob Crittenden <rcritten@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://lists.fedoraproject.org/archives/list/freeipa-devel@lists.fedorahosted.org/ or join us in IRC at irc://irc.freenode.net/freeipa