RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1736265 - Smart Card auth of local user: endless loop if wrong PIN was provided
Summary: Smart Card auth of local user: endless loop if wrong PIN was provided
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: sssd
Version: 8.0
Hardware: Unspecified
OS: Unspecified
unspecified
high
Target Milestone: rc
: 8.1
Assignee: SSSD Maintainers
QA Contact: Scott Poore
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-01 16:23 UTC by Alexey Tikhonov
Modified: 2020-05-02 19:11 UTC (History)
9 users (show)

Fixed In Version: sssd-2.2.0-15.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-11-05 22:34:54 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 5019 0 None closed Smart Card auth of local user: endless loop if wrong PIN was provided 2020-09-28 14:08:40 UTC
Github SSSD sssd issues 5027 0 None closed Smart Card auth of local user: endless loop if wrong PIN was provided 2020-09-28 14:08:40 UTC
Red Hat Product Errata RHSA-2019:3651 0 None None None 2019-11-05 22:35:01 UTC

Description Alexey Tikhonov 2019-08-01 16:23:56 UTC 
When I enter wrong PIN:
```
$ su certtets
PIN for test
^C
```
^^^ from user point of view everything seems to be hung.

Meantime sssd_pam & p11_child are in endless(?) loop trying to Login to (already locked) SC.

Issue seems to appear if `try_cert_auth` or `require_cert_auth` options are used.
Comment 2 Jakub Hrozek 2019-08-14 12:10:46 UTC 
* master: 5574de0f87e72d85547add9a48f9ac0def27f47d
Comment 4 Scott Poore 2019-08-21 13:27:30 UTC 
Verified.

Version ::

sssd-2.2.0-16.el8.x86_64

Results ::

First reproducing issue:

[root@rhel8-2 sssd]# rpm -q sssd
sssd-2.2.0-11.el8.x86_64

[root@rhel8-2 sssd]# p11tool --provider /usr/lib64/opensc-pkcs11.so --export 'pkcs11:model=PKCS%2315;manufacturer=Aventra%20Ltd.;serial=7055056447986431;token=sctest%20%28MyEID%29;id=%01;object=Certificate;type=cert' --outfile /tmp/card1.crt 

[root@rhel8-2 sssd]# dbus-send --system --print-reply --dest=org.freedesktop.sssd.infopipe /org/freedesktop/sssd/infopipe/Users org.freedesktop.sssd.infopipe.Users.ListByCertificate string:"$(cat /tmp/card1.crt)" uint32:10
method return time=1566393299.786685 sender=:1.256 -> destination=:1.255 serial=6 reply_serial=2
   array [
      object path "/org/freedesktop/sssd/infopipe/Users/example_2ecom/1778400201"
      object path "/org/freedesktop/sssd/infopipe/Users/shadowutils/1000"
   ]

[root@rhel8-2 sssd]# cat /etc/sssd/sssd.conf 
[domain/example.com]

debug_level = 9
krb5_auth_timeout = 60

id_provider = ipa
ipa_server = _srv_, rhel8-1.example.com
ipa_domain = example.com
ipa_hostname = rhel8-2.example.com
auth_provider = ipa
chpass_provider = ipa
access_provider = ipa
cache_credentials = True
# ldap_tls_cacert = /etc/ipa/ca.crt
# ldap_uri = ldaps://rhel8-1.example.com
# ldap_search_base = dc=example,dc=com
# ldap_schema = IPA
krb5_store_password_if_offline = True
sudo_provider = ipa
ldap_uri = ldap://rhel8-1.example.com
ldap_sudo_search_base = ou=sudoers,dc=example,dc=com

[sssd]
# user = sssd
debug_level = 9
services = nss, pam, ssh, sudo
domains = example.com, shadowutils

[nss]
debug_level = 9
homedir_substring = /home

[pam]
debug_level = 9
p11_child_timeout = 60
pam_cert_auth = True

[sudo]
debug_level = 9

[autofs]
debug_level = 9

[ssh]
debug_level = 9

[pac]
debug_level = 9

[ifp]
debug_level = 9

[secrets]
debug_level = 9

[session_recording]
debug_level = 9

[domain/shadowutils]
debug_level = 9
id_provider = files

[certmap/shadowutils/localuser]
debug_level = 9
matchrule = <SUBJECT>.*CN=ipauser1.*

[root@rhel8-2 sssd]# grep localuser /etc/passwd
localuser:x:1000:1000:local user:/home/localuser:/bin/bash

[root@rhel8-2 sssd]# su - localuser -c 'su - localuser -c whoami'
PIN for sctest (MyEID): 
localuser

^^^ so it works as expected with correct pin for local user ^^^

Now to see failure:

[root@rhel8-2 sssd]# time su - localuser -c 'su - localuser -c whoami'
PIN for sctest (MyEID): 
Password: 
localuser

real	1m34.613s
user	0m0.135s
sys	0m0.064s

Took 90secs roughly to failover to password prompt.

Now before verifying I need to unlock the pin:

[root@rhel8-2 sssd]# pkcs15-tool -u --pin redhat --puk redhat --auth-id 01
Using reader with a card: SCM Microsystems Inc. SCR 3310 [CCID Interface] (53311651713564) 00 00

Now upgrading and testing:

[root@rhel8-2 sssd]# dnf -y update sssd
...
Upgraded:
  libipa_hbac-2.2.0-16.el8.x86_64                      libsss_idmap-2.2.0-16.el8.x86_64                
  python3-libipa_hbac-2.2.0-16.el8.x86_64              python3-sss-2.2.0-16.el8.x86_64                 
  python3-sssdconfig-2.2.0-16.el8.noarch               sssd-2.2.0-16.el8.x86_64                        
  sssd-ad-2.2.0-16.el8.x86_64                          sssd-client-2.2.0-16.el8.x86_64                 
  sssd-common-2.2.0-16.el8.x86_64                      sssd-common-pac-2.2.0-16.el8.x86_64             
  sssd-dbus-2.2.0-16.el8.x86_64                        sssd-ipa-2.2.0-16.el8.x86_64                    
  sssd-kcm-2.2.0-16.el8.x86_64                         sssd-krb5-2.2.0-16.el8.x86_64                   
  sssd-krb5-common-2.2.0-16.el8.x86_64                 sssd-ldap-2.2.0-16.el8.x86_64                   
  sssd-polkit-rules-2.2.0-16.el8.x86_64                sssd-proxy-2.2.0-16.el8.x86_64                  
  sssd-tools-2.2.0-16.el8.x86_64                      

Complete!

[root@rhel8-2 sssd]# systemctl stop sssd; rm -rf /var/lib/sss/{db,mc}/*; systemctl start sssd

[root@rhel8-2 sssd]# time su - localuser -c 'su - localuser -c whoami'
PIN for sctest (MyEID): 
su: Authentication failure

real	0m16.113s
user	0m0.099s
sys	0m0.033s
Comment 6 errata-xmlrpc 2019-11-05 22:34:54 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, 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/RHSA-2019:3651
Note You need to log in before you can comment on or make changes to this bug.