Hi,


Description of problem:

If the RHEL6 host that acts as the server for x2go has enabled polyinstantiated /tmp directories as per

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Security-Enhanced_Linux/polyinstantiated-directories.html

then x2go clients cannot connect. They fail with

  The remote proxy closed the connection while negotiating
  the session. This may be due to the wrong authentication
  credentials passed to the server.

It seems that x2go needs the directory /tmp/.X11-unix/ to exist, be owned
by root, and be mode 1777.


Version-Release number of selected component (if applicable):

x2goserver-4.0.1.13-4.el6.x86_64
RHEL 6.5


How reproducible:

100%.


Steps to Reproduce:
1. Uncomment the line in /etc/security/namespace.conf that reads:
#/tmp     /tmp-inst/       	level      root,adm

2. Try to log in to that host via x2goclient.


Actual results:

x2go fails.


Expected results:

x2go works.


Additional info:

A workaround is to add something like the following to the end of
/etc/security/namespace.init:

if [ "$1" = "/tmp" ]; then
    XSOCKDIR=/tmp/.X11-unix
    if [ ! -d $XSOCKDIR ]; then
        mkdir $XSOCKDIR
        chmod 1777 $XSOCKDIR
    fi
fi

It would be great if x2go could fix this itself though.
Ideally it would either not need /tmp/.X11-unix, or be able to create it itself
when needed.


Thanks.