add-sftp-user/add-sftp.sh

#!/bin/bash

LOG_FILE="/home/jelastic/add-sftp-user-addon/logs/script_output.log"
VERBOSE=1  # Set to 1 for verbose mode, 0 for normal mode

log() {
    local timestamp=$(date +"%Y-%m-%d %H:%M:%S")
    echo "$timestamp - $1" >> $LOG_FILE
    if [ "$VERBOSE" -eq 1 ]; then
        echo "$timestamp - $1"
    fi
}

error_exit() {
    log "ERROR: $1"
    exit $2
}

# Generate random username and password
USERNAME=$1
PASSWORD=$2

# User's home directory
USER_HOME="/home/sftpusers/$USERNAME"
# The shared directory
ROOT_DIRECTORY="/var/www/webroot/ROOT"

log "Script started"

# Ensure the ROOT_DIRECTORY exists
if [ ! -d "$ROOT_DIRECTORY" ]; then
    error_exit "ROOT_DIRECTORY $ROOT_DIRECTORY does not exist." 2
fi

# Get the group ownership of the ROOT_DIRECTORY
ROOT_GROUP=$(stat -c '%G' $ROOT_DIRECTORY)

# Check if user already exists
if id "$USERNAME" &>/dev/null; then
    log "ERROR: User $USERNAME already exists."
    exit 3
fi

# Create user with their own directory under /home/sftpusers/
mkdir -p $USER_HOME
useradd -d $USER_HOME $USERNAME
if [ $? -ne 0 ]; then
    error_exit "Failed to create user $USERNAME." 4
fi
echo "$USERNAME:$PASSWORD" | chpasswd

# Create a symlink in the user's directory pointing to the shared ROOT_DIRECTORY
ln -s $ROOT_DIRECTORY $USER_HOME/ROOT
if [ $? -ne 0 ]; then
    error_exit "Failed to create symlink for $USERNAME." 5
fi
log "Symlink created for $USERNAME pointing to $ROOT_DIRECTORY"

# Set user's group to the ROOT_GROUP
usermod -aG $ROOT_GROUP $USERNAME
if [ $? -ne 0 ]; then
    error_exit "Failed to modify groups for $USERNAME." 6
fi
log "$USERNAME added to group $ROOT_GROUP"

# Adjust permissions and ownership for the user's directory
chown $USERNAME:$ROOT_GROUP $USER_HOME
chmod 750 $USER_HOME  # Owner has rwx, group has r-x, others have no permissions

# Adjust permissions and ownership for the ROOT_DIRECTORY
chown -R :$ROOT_GROUP /var/www/webroot/ROOT/
find /var/www/webroot/ROOT/ -type d -exec chmod 770 {} \;  # For directories
find /var/www/webroot/ROOT/ -type f -exec chmod 660 {} \;  # For files

# Set the SetGID bit on ROOT_DIRECTORY
chmod g+s $ROOT_DIRECTORY

HOSTNAME=$(hostname -f)
log "Script completed for user $USERNAME with hostname $HOSTNAME"
echo "{ \"USERNAME\": \"$USERNAME\", \"PASSWORD\": \"$PASSWORD\" }"
exit 0