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Bug 1859751

Summary: [RFE] Allow SSSD to use anonymous pkinit for FAST
Product: Red Hat Enterprise Linux 9 Reporter: Abhijit Roy <abroy>
Component: sssdAssignee: Sumit Bose <sbose>
Status: CLOSED ERRATA QA Contact: Madhuri <mupadhye>
Severity: low Docs Contact:
Priority: medium    
Version: 9.0CC: aboscatt, atikhono, grajaiya, jhrozek, lslebodn, mupadhye, mzidek, pbrezina, sgadekar, spurrier, thalman, tscherf
Target Milestone: rcKeywords: FutureFeature, Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: All   
OS: Linux   
Whiteboard: sync-to-jira
Fixed In Version: sssd-2.7.0-1.el9 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2022-11-15 11:17:20 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Abhijit Roy 2020-07-22 20:45:15 UTC 
[RFE] Allow SSSD to use anonymous pkinit for FAST

1. Proposed title of this feature request
   SSSD FAST implementation using Anonymous PKINIT
    
2. What is the nature and description of the request?  
              
For SSSD to use FAST a Kerberos keytab and service principal must exist.   Anonymous PKINIT can be used to create a credential cache to be used to established the FAST session.    I would like sssd to be enhanced to allow for the use on anonymous pkinit to create the FAST session.  
      
3. Please provide us the business requirements for this feature.
            
 Allows for use of FAST/OTP so that system admins can use MFA on a system without first having to create a system keytab.   RH8 deprecated pam_krb5 which allowed for the use of anonymous pkinit, therefore causing issues at our site in using FAST/OTP    
 
 4. Please provide us  functional requirements for this feature
  
RH8 deprecated pam_krb5 which allowed for the use of anonymous pkinit, therefore causing issues at our site in using FAST/OTP
Comment 6 Alexey Tikhonov 2021-08-31 18:34:59 UTC 
At this stage this RFE should target RHEL9. Once/if implemented, backport to RHEL8 might be considered.
Comment 7 Alexey Tikhonov 2022-02-10 11:23:46 UTC 
Pushed PR: https://github.com/SSSD/sssd/pull/5962

* `master`
    * 7e839befe84995f28b34bf3774ae65813218e047 - krb5: add krb5_fast_use_anonymous_pkinit option
    * 58ab4137c45d3d284cd25ef485614a61456fad05 - krb5_child: add fast-use-anonymous-pkinit option
    * d1ad68fab06cb61d9c935b698c40cf745b54d672 - krb5_child: move FAST TGT request into a function
Comment 9 Sumit Bose 2022-03-10 10:40:34 UTC 
Hi,

to test this feature please setup a FreeIPA server with default setting, a trust is AD is not needed. After the setup is finished the following should just work:

# kinit -n
# klist
Ticket cache: KCM:0
Default principal: WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS

Valid starting       Expires              Service principal
03/10/2022 10:14:26  03/11/2022 09:39:15  krbtgt/IPA.VM


If you now set

    krb5_fast_use_anonymous_pkinit = True

in the [domain/...] section of sssd.conf, restart SSSD and do a login as IPA user, e.g.

    ssh admin@localhost

you should have a ccache file with the FAST armor ticket like:

# klist /var/lib/sss/db/fast_ccache_IPA.VM 
Ticket cache: FILE:/var/lib/sss/db/fast_ccache_IPA.VM
Default principal: WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS

Valid starting       Expires              Service principal
03/10/2022 10:33:45  03/10/2022 10:43:45  krbtgt/IPA.VM


(please note your realm might be different than IPA.VM)

The important part is 'Default principal: WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS' which indicates that anonymous pkinit was used. By default (without 'krb5_fast_use_anonymous_pkinit = True') the ccache will have a ticket for the host principal e.g.:

# klist /var/lib/sss/db/fast_ccache_IPA.VM 
Ticket cache: FILE:/var/lib/sss/db/fast_ccache_IPA.VM
Default principal: host/master.client.vm

Valid starting       Expires              Service principal
03/10/2022 10:40:06  03/11/2022 10:10:28  krbtgt/IPA.VM





HTH

bye,
Sumit
Comment 13 Madhuri 2022-05-30 08:15:47 UTC 
Verified with automation,

2022-05-30T08:07:32 ok: [master.testrealm.test] => (item=ipa-server) => 
2022-05-30T08:07:32   msg:
2022-05-30T08:07:32   - arch: x86_64
2022-05-30T08:07:32     epoch: null
2022-05-30T08:07:32     name: ipa-server
2022-05-30T08:07:32     release: 8.el9
2022-05-30T08:07:32     source: rpm
2022-05-30T08:07:32     version: 4.9.8
2022-05-30T08:07:32 skipping: [client.testrealm.test] => (item=ipa-server) 
2022-05-30T08:07:32 ok: [master.testrealm.test] => (item=sssd-common) => 
2022-05-30T08:07:32   msg:
2022-05-30T08:07:32   - arch: x86_64
2022-05-30T08:07:32     epoch: null
2022-05-30T08:07:32     name: sssd-common
2022-05-30T08:07:32     release: 2.el9
2022-05-30T08:07:32     source: rpm
2022-05-30T08:07:32     version: 2.7.0


2022-05-30T07:57:39 ============================= test session starts ==============================
2022-05-30T07:57:39 platform linux -- Python 3.9.12, pytest-7.1.1, pluggy-1.0.0 -- /usr/bin/python3
2022-05-30T07:57:39 cachedir: .pytest_cache
...
...
2022-05-30T08:05:47 src/tests/multihost/ipa/test_misc.py::Testipabz::test_anonymous_pkinit_for_fast PASSED [ 66%]
2022-05-30T08:06:36 src/tests/multihost/ipa/test_misc.py::Testipabz::test_anonymous_pkinit_for_fast_false PASSED [ 75%]
...
...
Comment 15 errata-xmlrpc 2022-11-15 11:17:20 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sssd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8325