#!/bin/bash
#
# Usage: ./chroot-useradd username [shell]
#

# Here specify the apps you want into the enviroment
CMD="bash ls touch mkdir cp mv rm pwd chmod cat vi id rsync ssh scp sftp ping ssh-keygen perl"
APPS=`which $CMD`
APPS="${APPS} /usr/libexec/openssh/sftp-server"

# Sanity check
if [ "$1" = "" ] ; then
    echo "  Usage: ./chroot-useradd username [shell]"
    exit 1
fi

# Obtain username and HomeDir
CHROOT_USERNAME=$1
if [ "$2" = "" ] ; then
    useradd $CHROOT_USERNAME
else
    useradd -s $2 $CHROOT_USERNAME
fi
chown root:root /home/$CHROOT_USERNAME
chmod 755 /home/$CHROOT_USERNAME
usermod -d /home/$CHROOT_USERNAME/./ $CHROOT_USERNAME
passwd $CHROOT_USERNAME
rm -f /home/$CHROOT_USERNAME/.* > /dev/null 2>&1
cd /home/$CHROOT_USERNAME/./

# Create Directories no one will do it for you
mkdir -p etc
mkdir -p bin
mkdir -p usr/bin
mkdir -p usr/local/bin
mkdir -p usr/libexec/openssh
rpm -q MAKEDEV > /dev/null 2>&1
[ $? -ne 0 ] && yum -y install MAKEDEV > /dev/null 2>&1
MAKEDEV -d dev -x null zero

# Create short version to /usr/bin/groups
# On some system it requires /bin/sh, which is generally unnessesary in a  chroot cage
echo "#!/bin/bash" > usr/bin/groups
echo "id -Gn" >> usr/bin/groups
chmod 755 usr/bin/groups

# Add some users to ./etc/paswd
grep /etc/passwd -e "^root" -e "^$CHROOT_USERNAME" > etc/passwd
grep /etc/group -e "^root" -e "^$CHROOT_USERNAME" > etc/group

# Copy the apps and the related libs
for prog in $APPS;
do
    cp $prog ./$prog
    # obtain a list of related libraryes
    ldd $prog > /dev/null
    if [ "$?" = 0 ] ; then
        LIBS=`ldd $prog | awk '{ print $3 }'`
        for l in $LIBS;
        do
            mkdir -p ./`dirname $l` > /dev/null 2>&1
            cp $l ./$l > /dev/null 2>&1
        done
    fi
done

# From some strange reason these 4 libraries are not in the ldd output, but  without them
# some stuff will not work, like usr/bin/groups
cp /lib/libnss_compat.so.2 lib/
cp /lib/libnsl.so.1 lib/
cp /lib/libnss_files.so.2 lib/
cp /lib/ld-linux.so.2 ./lib/
cp /lib/libc.so.6 lib/
cp /lib/libm.so.6 lib/
cp /lib/libpthread.so.0 lib/
cp /lib/librt.so.1 lib/
cp /lib/libthread_db.so.1 lib/

exit 0