#!/bin/sh -e
# Copyright 2017 IBM Corp.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# 	http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if [ "$USER" != "root" ]; then
    echo "adddropbox must be run as root"
    exit 1;
fi

if [ ! -e ./adddropbox ]; then
    echo "adddropbox must be run from framework directory"
    exit 1;
fi

if [ "$2" = "" ]; then
  echo "Syntax: adddropbox <userid> <SSH public key file>"
  exit 1;
fi
USERID=$1
PUBKEY=$2

if [ ! -e ./request_pub.pem ]; then
    echo "Generating request encryption key pair"
    openssl genpkey -algorithm RSA -out request_priv.pem -pkeyopt rsa_keygen_bits:2048
    chmod 600 request_priv.pem
    openssl rsa -pubout -in request_priv.pem -out request_pub.pem
fi


REM=`echo $USERID | cut -c 9-`
if [ "$REM" != "" ]; then
    echo "Userid character length limit is 8"
    exit 1;
fi

if [ ! -e $PUBKEY ]; then
    echo "Public key file doesn't exist : $PUBKEY"
    exit 1;
fi

grep -q ssh-rsa $PUBKEY
if [ $? -ne 0 ]; then
    echo "Public key doesn't appear to be in correct format"
    exit 1;
fi

if [ -e /home/dropbox/$USERID ]; then
    echo "Dropbox for $USERID already exists"
    exit 1;
fi

# Ok, do this thing
echo "Creating new dropbox for $USERID"

useradd -s /bin/false -G signers -M $USERID
mkdir /home/$USERID
chown root:$USERID /home/$USERID
chmod 750 /home/$USERID
mkdir /home/dropbox/$USERID/
chown $USERID:signers /home/dropbox/$USERID
chmod 770 /home/dropbox/$USERID
cp ./request_pub.pem /home/dropbox/$USERID
mkdir /home/$USERID/dropbox
mount --bind /home/dropbox/$USERID/ /home/$USERID/dropbox
echo "/home/dropbox/$USERID/ /home/$USERID/dropbox    none   bind" >> /etc/fstab

echo "
Match User $USERID
  ChrootDirectory /home/$USERID
  ForceCommand internal-sftp
  AllowTcpForwarding no
  PermitTunnel no
  X11Forwarding no
" >> /etc/ssh/sshd_config

cp $PUBKEY /etc/ssh/authorized_keys/$USERID
rm -f $PUBKEY

systemctl restart sshd

echo "Dropbox for $USERID setup"
echo "Next ensure a matching CCA profile exists and then run 'password_generate -profile $USERID -sender <signers email>'"