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KB-3532: Centrify-enabled OpenSSH alters $PATH

Centrify DirectControl ,  

12 April,16 at 11:18 AM

Applies to: Centrify-enabled OpenSSH earlier than 6.0p1 on all platforms
 
Question:
 
When logging in over ssh as a normal user, the following behavior is observed:
 
-bash-3.2$ echo $PATH
 
/usr/share/centrifydc/bin:/usr/local/bin:/bin:/usr/bin
 
Then sudo to root or using su -:
 
yourhost# echo $PATH
/usr/sbin:/usr/bin
 
Now after logging in over ssh as root directly:
 
yourhost# echo $PATH
/usr/share/centrifydc/sbin:/usr/share/centrifydc/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
 
The results show that Centrify OpenSSH alters the PATH variable by putting /usr/share/centrifydc/(s)bin and /usr/local/(s)bin BEFORE the system paths. This is unexpected behaviour and did not happen with the previous version of Centrify OpenSSH. This breaks applications. Centrify pushes its own preferred path order ahead of the normal system path order. 
 
Why does this happen?
 
Answer:
 
In the current design (OpenSSH 6.0p1), it is true that Centrify puts /usr/share/centrifydc/(s)bin and /usr/local/(s)bin before the system paths.  
 
On RedHat systems, /etc/profile.d/Centrify-ssh.sh takes care of $PATH. However in Solaris, there is no /etc/profile.d directory.
 
Centrify has been asked to provide several different default PATH settings from sshd. This is before invoking shell, and primarily affects ssh -c processing. 
 
Since OpenSSH has this as a BUILD option, it is favorable for some environments, but may cause issues for others.
 
In Centrify DirectControl 5.1.0 OpenSSH (based on 6.0p1), the Centrify distro of OpenSSH has this as a configurable run-time option (DefEnvPATH), so as to allow customization of the desired setting. 
 
myhost@/home/joe:~$ s cat /etc/centrifydc/ssh/sshd_config|grep DefEnv
 
DefEnvPATH /home/joe:/usr/bin:/usr/local/bin:/bin
 
The desired $PATH can be defined here.
 
 
 
 

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