How to hide password from osascript prompted dialog from Mac / UNIX Script shell

I am at the last stage of designing a script to automate an Active Directory binding to be used by multiple people. Because of this, I need to prompt for a username and password. I successfully created a request, but I want to find a way to prevent the password from appearing in the password prompt dialog (this will be done remotely, I don't want the password to be visible).

It can be turned into stars, dots, and not anything at all, I just need NOT to show it visually, but you can still pass the dsconfigad command.

I've tested the script myself and it works and this is the last snippet I need to make it live.

(Sorry for additional comments, I put this together from various sources)

#!/bin/bash

while :; do # Loop until valid input is entered or Cancel is pressed.
    user=$(osascript -e 'Tell application "System Events" to display dialog "Enter the network user name:" default answer ""' -e 'text returned of result' 2>/dev/null)
    if (( $? )); then exit 1; fi  # Abort, if user pressed Cancel.
    user=$(echo -n "$user" | sed 's/^ *//' | sed 's/ *$//')  # Trim leading and trailing whitespace.
    if [[ -z "$user" ]]; then
        # The user left the project name blank.
        osascript -e 'Tell application "System Events" to display alert "You must enter a user name; please try again." as warning' >/dev/null
        # Continue loop to prompt again.
    else
        # Valid input: exit loop and continue.
        break
    fi
done

while :; do # Loop until valid input is entered or Cancel is pressed.
    netpass=$(osascript -e 'Tell application "System Events" to display dialog "Enter the network password:" default answer ""' -e 'text returned of result' 2>/dev/null)
    if (( $? )); then exit 1; fi  # Abort, if user pressed Cancel.
    netpass=$(echo -n "$netpass" | sed 's/^ *//' | sed 's/ *$//')  # Trim leading and trailing whitespace.
    if [[ -z "$netpass" ]]; then
        # The user left the project name blank.
        osascript -e 'Tell application "System Events" to display alert "You must enter a password; please try again." as warning' >/dev/null
        # Continue loop to prompt again.
    else
        # Valid input: exit loop and continue.
            break
        fi
    done

MACNAME=$(scutil --get ComputerName)

sudo dsconfigad -add DOMAIN \
-username $user \
-password $netpass \
-computer $MACNAME \
-mobile disable \
-mobileconfirm disable \
-localhome enable \
-useuncpath enable \
-shell /bin/bash \
-ou OU=Macs,CN=Computers,DC=corp,DC=DOMAIN,DC=net \
-force \
-localpassword LOCALPASS \
-groups "GROUPS"

#sudo rm -- "$0"