sudoRunAsUser option not behaving properly

Hi,

I was pointed to discussion regarding sudo RunAsUser/RunAsGroup problems 
[1] and have a question about inproperly handled RunAsUsers as mentioned 
in the discussion. I'm working on FreeIPA where I have: user testuser, 
group testgroup, sudorule testrule with RunAsUser empty and 
RunAsGroup=testgroup. When I want to see list of commands user testuser 
can run, I get:


# su -c "sudo -ll -n" testuser

Matching Defaults entries for testuser on <hostname>:

!visiblepw, env_reset, env_keep="COLORS DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin, !authenticate

User testuser may run the following commands on <hostname>:

  

SSSD Role: testrule

     RunAsUsers: testuser

     RunAsGroups: testgroup

     Options: !authenticate

     Commands:

     ALL


I'm afraid that the RunAsUsers=testuser is a bug and result should be 
RunAsUsers=root (i.e. default, which was not changed), but I need a 
confirmation on that this issue is a bug indeed and not a change in 
behaviour.

The problem first occured with sudo-1.8.18-1, then I tried installing 
and running it with sudo-1.8.18-rc4 where some issues with RunAsUsers 
were said to be fixed, but this issue persisted.


Thanks,

Lenka


[1] https://www.sudo.ws/pipermail/sudo-workers/2016-September/001014.html

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