User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36 Build Identifier: With Fedora 24, I configured kerberos authentication using authconfig-tui, and added a local user with the same username as my centralized account, which allowed me to login via ssh and gdm and allowed me to use sudo with my centrally managed account password. Upon upgrade to Fedora 25, I was no longer able to login using centralized credentials via kerberos. Upon explicitly installing krb5-workstation and again running authconfig-tui, I was again able to login via ssh using my centralized account credentials. However, I am now no longer able to use sudo with my centralized credentials unless I add the "NOPASSWD:" flag to my user or group entry in the sudoers file. Any attempt to use sudo without the NOPASSWD flag or "su" to login to a centralized account fails with an authentication failed error. Reproducible: Always Steps to Reproduce: 1. Install krb5-workstation. 2. Run authconfig-tui to configure kerberos authentication with a local user database. 3. Create a local account with a username that matches a centralized account managed by the KDC/realm. 4. Add the local account name to the sudoers file with an entry like, "<username> ALL=(ALL) ALL" or add the user to the "wheel" group. 5. Enable sshd and configure sshd with "KerberosAuthentication yes". 6. Login via ssh with the newly configured user using the centrally managed password. 7. Run "sudo ls" as the newly configured user. (I think that covers it). Actual Results: [<username>@nl-f19-kenn101 ~]$ sudo ls [sudo] password for <username>: Sorry, try again. [sudo] password for <username>: Sorry, try again. [sudo] password for <username>: sudo: 3 incorrect password attempts Expected Results: [sudo] password for <username>: <file list output> Doing "journalctl -f" as root when attempting to execute sudo with a centralized user account yields the following output. // Feb 03 08:13:46 nl-f19-kenn101.uncc.edu unix_chkpwd[13742]: password check failed for user (<username>) Feb 03 08:13:46 nl-f19-kenn101.uncc.edu audit[13740]: USER_AUTH pid=13740 uid=1001 auid=1001 ses=12 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=? acct="<username>" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/1 res=failed' Feb 03 08:13:46 nl-f19-kenn101.uncc.edu sudo[13740]: pam_unix(sudo:auth): authentication failure; logname=<username> uid=1001 euid=0 tty=/dev/pts/1 ruser=<username> rhost= user=<username> Feb 03 08:13:53 nl-f19-kenn101.uncc.edu unix_chkpwd[13748]: password check failed for user (<username>) Feb 03 08:13:53 nl-f19-kenn101.uncc.edu audit[13740]: USER_AUTH pid=13740 uid=1001 auid=1001 ses=12 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=? acct="<username>" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/1 res=failed' Feb 03 08:13:59 nl-f19-kenn101.uncc.edu unix_chkpwd[13750]: password check failed for user (<username>) Feb 03 08:13:59 nl-f19-kenn101.uncc.edu audit[13740]: USER_AUTH pid=13740 uid=1001 auid=1001 ses=12 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=? acct="<username>" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/1 res=failed' Feb 03 08:14:01 nl-f19-kenn101.uncc.edu audit[13740]: USER_CMD pid=13740 uid=1001 auid=1001 ses=12 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='cwd="/home/<username>" cmd="ls" terminal=pts/1 res=failed' Feb 03 08:14:01 nl-f19-kenn101.uncc.edu sudo[13740]: <username> : 3 incorrect password attempts ; TTY=pts/1 ; PWD=/home/<username> ; USER=root ; COMMAND=/bin/ls // This may be related to bug ID 1382430, but I really don't know enough about how Kerberos works to be sure. I feel like the issue is not really a ticket granting issue. My KDC is a Microsoft ADC. It seems like a bug though simply because it worked previously with the exact same setup.
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