This is Cntlm with Kerberos patch applied.

Works on a Ubuntu 12.04 box, at least for me.

Dependency: Kerberos.

If Kerberos is compiled to a different location, say, $HOME/usr, compile Cntlm with

./configure --enable-kerberos

export LIBRARY_PATH=$HOME/usr/lib

export C_INCLUDE_PATH=$HOME/usr/include

make

To run it, try cntlm --help or cntlm -v and fix whatever it complains.

I have only the following lines in my ctnlm.conf file:

Username    
Domain      
Password    
Proxy       proxy.server.domain.com:3128
NoProxy     localhost, 127.0.0.*, 10.*, 192.168.*
Listen      3128

The username, domain and password are all unset.

I could start it with /home/me/usr/opt/cntlm-0.92.3/cntlm -a gss -c /home/me/usr/opt/cntlm-0.92.3/cntlm.conf .