No edit summary |
|||
| (7 intermediate revisions by 4 users not shown) | |||
| Line 25: | Line 25: | ||
== Current status == | == Current status == | ||
* Targeted release: [[Releases/17 | Fedora 17 ]] | * Targeted release: [[Releases/17 | Fedora 17 ]] | ||
* Last updated: | * Last updated: 2012-Mar-31 | ||
* Percentage of completion: | * Percentage of completion: 100% | ||
** | ** packages were built in Fedora: | ||
** | *** sssd-1.8.0-1.fc17.beta1 | ||
*** sudo-1.8.3p1-4.fc17 | |||
<!-- CHANGE THE "FedoraVersion" TEMPLATES ABOVE TO PLAIN NUMBERS WHEN YOU COMPLETE YOUR PAGE. --> | <!-- CHANGE THE "FedoraVersion" TEMPLATES ABOVE TO PLAIN NUMBERS WHEN YOU COMPLETE YOUR PAGE. --> | ||
| Line 58: | Line 59: | ||
<!-- What work do the developers have to accomplish to complete the feature in time for release? Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?--> | <!-- What work do the developers have to accomplish to complete the feature in time for release? Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?--> | ||
== How To Test == | == How To Test == | ||
In general, using sudoers rules stored in LDAP should work as it used to with the original direct LDAP lookups, there should be no changes in behavior. The user should be able to test offline support by shutting down the LDAP server - sudo should still work in that case. | In general, using sudoers rules stored in LDAP should work as it used to with the original direct LDAP lookups, there should be no changes in behavior. The user should be able to test offline support by shutting down the LDAP server - sudo should still work in that case. | ||
To configure Sudo using SSSD for lookups, the user needs an LDAP server that contains a couple of rules for a particular user or a group. Refer to the [http://www.gratisoft.us/sudo/sudoers.ldap.man.html sudoers manual] for more details on the LDIF format of the rules. | To configure Sudo using SSSD for lookups, the user needs an LDAP server that contains a couple of rules for a particular user or a group. Refer to the [http://www.gratisoft.us/sudo/sudoers.ldap.man.html sudoers manual] for more details on the LDIF format of the rules. | ||
* install the appropriate packages | |||
** sssd-1.8.0-1.fc17.beta1 or newer | |||
** sudo-1.8.3p1-4.fc17 or newer | |||
* configure Sudo to use the SSS back end | * configure Sudo to use the SSS back end | ||
** put <code>sudoers: sss</code> into <code>/etc/nsswitch.conf</code> | ** put <code>sudoers: sss</code> into <code>/etc/nsswitch.conf</code> | ||
| Line 69: | Line 71: | ||
** specify the search base SSSD should look into using the <code>ldap_sudo_search_base</code> option in the domain section of <code>sssd.conf</code> | ** specify the search base SSSD should look into using the <code>ldap_sudo_search_base</code> option in the domain section of <code>sssd.conf</code> | ||
** restart SSSD | ** restart SSSD | ||
* test the online support | |||
** log in as a user allowed to run sudo | |||
** run <code>sudo -l</code>. You should see the list of sudo rules you are allowed to run | |||
* test the offline support: | * test the offline support: | ||
** turn off the <code>network</code> service or NetworkManager or shut down your LDAP server | ** turn off the <code>network</code> service or NetworkManager or shut down your LDAP server | ||
| Line 100: | Line 105: | ||
== Documentation == | == Documentation == | ||
There is | See <code>man sssd-ldap</code> and <code>man sssd.conf</code>. Search for options that contain "sudo". | ||
There is a [http://jhrozek.livejournal.com/2065.html blog post] with some user-centric documentation and a guide that explains how to migrate to an SSSD-backed setup. | |||
<!-- Is there upstream documentation on this feature, or notes you have written yourself? Link to that material here so other interested developers can get involved. --> | <!-- Is there upstream documentation on this feature, or notes you have written yourself? Link to that material here so other interested developers can get involved. --> | ||
| Line 111: | Line 117: | ||
== Comments and Discussion == | == Comments and Discussion == | ||
* See [[Talk:Features/ | * See [[Talk:Features/SSSDSudoIntegration]] <!-- This adds a link to the "discussion" tab associated with your page. This provides the ability to have ongoing comments or conversation without bogging down the main feature page --> | ||
[[Category: | [[Category:FeatureAcceptedF17]] | ||
<!-- When your feature page is completed and ready for review --> | <!-- When your feature page is completed and ready for review --> | ||
<!-- remove Category:FeaturePageIncomplete and change it to Category:FeatureReadyForWrangler --> | <!-- remove Category:FeaturePageIncomplete and change it to Category:FeatureReadyForWrangler --> | ||
<!-- After review, the feature wrangler will move your page to Category:FeatureReadyForFesco... if it still needs more work it will move back to Category:FeaturePageIncomplete--> | <!-- After review, the feature wrangler will move your page to Category:FeatureReadyForFesco... if it still needs more work it will move back to Category:FeaturePageIncomplete--> | ||
<!-- A pretty picture of the page category usage is at: https://fedoraproject.org/wiki/Features/Policy/Process --> | <!-- A pretty picture of the page category usage is at: https://fedoraproject.org/wiki/Features/Policy/Process --> | ||
Latest revision as of 01:43, 1 April 2012
SSSD-Sudo Integration
Summary
Provide means of looking up sudoers rules stored in remote directories such as LDAP via SSSD instead of direct LDAP lookups.
Owner
- Name: Pavel Březina
- Email: pbrezina@redhat.com
- Name: Stephen Gallager
- Email: sgallagh@redhat.com
- Name: Jakub Hrozek
- Email: jhrozek@redhat.com
- Name: Daniel Kopeček
- Email: dkopecek@redhat.com
Current status
- Targeted release: Fedora 17
- Last updated: 2012-Mar-31
- Percentage of completion: 100%
- packages were built in Fedora:
- sssd-1.8.0-1.fc17.beta1
- sudo-1.8.3p1-4.fc17
- packages were built in Fedora:
Detailed Description
In addition to the standard sudoers file, sudo may be configured via LDAP. This is very useful in large environments to provide centralized sudoers storage.
However, sudo performs all the lookups on its own, communicating directly with the remote directory. The goal of this feature is to extend sudo so that instead of talking directly to the LDAP server, it would communicate with SSSD's sudo responder process.
SSSD would provide access to the remote directory, while sudo would leverage all the benefits SSSD brings over performing the lookups in sudo directly. The major benefit is that sudo could take advantage of SSSD's caching capabilities. That would enable sudo to operate even if the remote directory is not reachable.
Benefit to Fedora
The benefits of the integration are:
- offline access - sudoers rules would be stored in a persistent cache, allowing sudo to fetch the rules seamlessly even in cases when the LDAP server is not reachable such as user roaming with a laptop.
- unified configuration of LDAP parameters such as the servers used, timeout options and security properties at one places (sssd.conf)
- sudo would take advantage of the advanced features SSSD has such as server fail over, server discovery using DNS SRV lookups and more
- only one connection to the LDAP server open at a time resulting in less load on the LDAP server and better performance
- caching of the rules - less load on the LDAP server and better performance on the client side as the client wouldn't have to go to the server with each request
- back end abstraction - data may be stored in NIS or other databases and accessed by the sudo transparently
Scope
This feature requires changes to both SSSD and sudo:
- SSSD needs to create a new responder process that would listen on a UNIX socket, process requests, and send back data. The LDAP back end process needs to be extended to look up sudoers data.
- Sudo needs to extend the sudoers plugin to send requests for sudo rules to SSSD and extract the rules from data it gets back from SSSD
How To Test
In general, using sudoers rules stored in LDAP should work as it used to with the original direct LDAP lookups, there should be no changes in behavior. The user should be able to test offline support by shutting down the LDAP server - sudo should still work in that case.
To configure Sudo using SSSD for lookups, the user needs an LDAP server that contains a couple of rules for a particular user or a group. Refer to the sudoers manual for more details on the LDIF format of the rules.
- install the appropriate packages
- sssd-1.8.0-1.fc17.beta1 or newer
- sudo-1.8.3p1-4.fc17 or newer
- configure Sudo to use the SSS back end
- put
sudoers: sssinto/etc/nsswitch.conf
- put
- configure SSSD to run the Sudo responder and look up sudoers rules from an LDAP server
- put a new record
sudointo theservicesoption in the[sssd]section ofsssd.conf - specify the search base SSSD should look into using the
ldap_sudo_search_baseoption in the domain section ofsssd.conf - restart SSSD
- put a new record
- test the online support
- log in as a user allowed to run sudo
- run
sudo -l. You should see the list of sudo rules you are allowed to run
- test the offline support:
- turn off the
networkservice or NetworkManager or shut down your LDAP server - sudo should still be able to look up the rules from SSSD. SSSD would return the rules from its cache instead of the server.
- turn off the
User Experience
In case the LDAP server is not reachable, sssd would seamlessly fall back to serving sudoers data from cache, allowing the user to continue using sudo. The user would benefit from centralizing the LDAP configuration at one place, including advanced features that were not available before such as server fail over or DNS SRV lookups. The user might also notice better performance due to caching support and better load on the LDAP server because SSSD only opens a single connection at a time.
Dependencies
As stated above, this feature depends on changes in both sudo and SSSD. There are no other external dependencies.
Contingency Plan
None required, Fedora would keep using the LDAP lookup module in sudo.
Documentation
See man sssd-ldap and man sssd.conf. Search for options that contain "sudo".
There is a blog post with some user-centric documentation and a guide that explains how to migrate to an SSSD-backed setup.
Release Notes
Fedora 17 enables sudo to look up sudoers rules stored in LDAP using SSSD. The SSSD daemon caches the data, providing offline support for sudo, which means that sudo is able to function even without access to the LDAP server. Unifying the configuration in sssd.conf also brings the benefit of providing advanced features such as server fail over and fine-grained cache settings.