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* sshd | * sshd | ||
* nfs-utls | * nfs-utls | ||
For daemons that use a keytab to kinit because they act as clients (as | |||
opposed to just server that accept kerberos connections), it may be | |||
needed to add a configuration snipppet in their configuration file | |||
under /etc/tmpfiles.d so that /run/user/<username> is created with the | |||
correct permissions (700) and user ownership. | |||
For example, httpd would add the following line to | |||
the /etc/tmpfiles.d/httpd.conf: | |||
d /var/run/user/apache 700 apache apache | |||
Some other daemons (such as rpc.gssd and sshd) have hard-coded /tmp locations and will require patching to complete this transition. | |||
We are still investigating which packages require changes. | |||
== Contingency Plan == | == Contingency Plan == | ||
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<!-- The Fedora Release Notes inform end-users about what is new in the release. Examples of past release notes are here: http://docs.fedoraproject.org/release-notes/ --> | <!-- The Fedora Release Notes inform end-users about what is new in the release. Examples of past release notes are here: http://docs.fedoraproject.org/release-notes/ --> | ||
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* | * Fedora 18 changes the standard location of Kerberos credential caches to /run/user/$USERNAME in order to increase security and simplify locating the caches for NFSv4. | ||
== Comments and Discussion == | == Comments and Discussion == | ||
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[[Category: | [[Category:FeatureReadyForWrangler]] | ||
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Revision as of 20:39, 23 February 2012
Feature Name
KRB5 Credential Cache Move
Summary
This Feature changes the default location of Kerberos credential cache from living in /tmp/krb5cc_UID_XXXXXX to being /run/user/$USERNAME/krb5cc
Owner
- Name: Stephen Gallagher
- Email: sgallagh@fedoraproject.org
- Name: Dan Walsh
- Email: dwalsh@fedoraproject.org
Current status
- Targeted release: Fedora 18
- Last updated: 2012-02-23
- Percentage of completion: 10%
Detailed Description
Packages that create Kerberos credential caches on behalf of a user (real or system) will need to change where this cache is stored.
Benefit to Fedora
The reason is to make credential saving a bit more predictable while at the same time avoiding races. Along the road we also gain a little bit more security by the fact that /run is a tmpfs and therefore cached credentials are automatically removed if the machine is shut off.
Scope
For daemons that use a keytab to kinit because they act as clients (as opposed to just server that accept kerberos connections), it may be needed to add a configuration snippet in their configuration file under /etc/tmpfiles.d so that /run/user/<username> is created with the correct permissions (700) and user ownership.
For example, httpd would add the following line to the /etc/tmpfiles.d/httpd.conf:
d /var/run/user/apache 700 apache apache
If you know your daemon requires a credential cache file and does not specify one on its own but instead relies on the default location, then you should open a ticket in bugzilla and add the necessary configuration to tmpfiles.d
How To Test
1. Verify that when logging in through SSSD or pam_krb5 that the credential cache listed by 'klist' is FILE:/run/user/$USERNAME/krb5cc 2. Verify that applications such as apache (used with mod-auth_kerb) put their credential caches in /run/user/$SVCUSERNAME as well
User Experience
The end-user experience should be minimally changed. The most noticable effect will be that credential caches will not survive a reboot (this is a security enhancement, preventing a stolen system from being accessed for still-valid credentials).
Dependencies
This list is not (yet) complete:
- sssd
- mod_auth_kerb
- sshd
- nfs-utls
For daemons that use a keytab to kinit because they act as clients (as
opposed to just server that accept kerberos connections), it may be
needed to add a configuration snipppet in their configuration file
under /etc/tmpfiles.d so that /run/user/<username> is created with the
correct permissions (700) and user ownership.
For example, httpd would add the following line to the /etc/tmpfiles.d/httpd.conf:
d /var/run/user/apache 700 apache apache
Some other daemons (such as rpc.gssd and sshd) have hard-coded /tmp locations and will require patching to complete this transition.
We are still investigating which packages require changes.
Contingency Plan
Reverting to the original behavior will be possible, though non-trivial. Our current plan is to land this feature very early in the F18 process (some pieces are already landing today on 2012-02-23) so that we have the maximum amount of time to work out any issues.
Documentation
- No relevant documentation
Release Notes
- Fedora 18 changes the standard location of Kerberos credential caches to /run/user/$USERNAME in order to increase security and simplify locating the caches for NFSv4.