/usr/bin/smd-restricted-shell is in syncmaildir 1.2.6-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh
#
# Released under the terms of GPLv3 or at your option any later version.
# No warranties.
# Copyright Enrico Tassi <gares@fettunta.org>
set -e
#set -x
PREFIX="/usr"
if [ `echo "$PREFIX" | cut -c -1` = "@" ]; then
echo "smd-restricted-shell not installed, assuming PREFIX=."
WHERE="./"
else
WHERE="$PREFIX/bin"
fi
# check that SSH_ORIGINAL_COMMAND contains only
# smd-client/smd-server
C=`echo $SSH_ORIGINAL_COMMAND | cut -f 1 -d ' '`
if [ "$C" != "$WHERE/smd-client" -a "$C" != "$WHERE/smd-server" ]; then
exit 1
fi
# we now run the smd command
exec $SSH_ORIGINAL_COMMAND
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