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Samba HowTo Guide
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Limiting Logon Connections

Sometimes it is necessary to limit the number of concurrent connections to a Samba shared resource. For example, a site may wish to permit only one network logon per user.

The Samba preexec script parameter can be used to permit only one connection per user. Though this method is not foolproof and may have side effects, the following contributed method may inspire someone to provide a better solution.

This is not a perfect solution because Windows clients can drop idle connections with an auto-reconnect capability that could result in the appearance that a share is no longer in use, while actually it is. Even so, it demonstrates the principle of use of the preexec script parameter.

The following share configuration demonstrates use of the script shown in ???.

[myshare]
	...
	preexec script = /sbin/PermitSingleLogon.sh
	preexec close = Yes
	...

Example24.1.Script to Enforce Single Resource Logon

#!/bin/bash

IFS="-"
RESULT=$(smbstatus -S -u $1 2> /dev/null | awk 'NF \
        > 6 {print $1}' | sort | uniq -d)

if [ "X${RESULT}" == X  ]; then
  exit 0
else
  exit 1
fi
Samba HowTo Guide
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