netaccess.sh

#!/bin/bash

# Temporary cookie jar
tmpfile=$(mktemp)

cleanup() {
  rm -rf "$tmpfile"
}

trap cleanup EXIT
trap cleanup SIGINT

usage() {
  cat <<EOM
    NAME
      netaccess.sh - Authorize machine in IITM Network

    SYNOPSIS
      $0 -u LDAP_USERNAME -p LDAP_PASSWORD [-Ph]

    OPTIONS
      -u
        LDAP username

      -p
        LDAP password

      -P
        Enable IITM remote proxy (intended for development outside IITM network)

      -h
        Show help

    AUTHOR
      Ashwin A Nayar <ashwin5059198@gmail.com>
EOM
}

# Default values goes here
LDAP_USR=""
LDAP_PWD=""
ENABLE_PROXY=false

while getopts ":u:p:Ph" options; do
  case "$options" in
    u)
      LDAP_USR=${OPTARG}
      ;;
    p)
      LDAP_PWD=${OPTARG}
      ;;
    h)
      usage
      exit 0
      ;;
    P)
      ENABLE_PROXY=true
      ;;
    :)
      echo "Error: -${OPTARG} requires an argument."
      usage
      exit 1
      ;;
    *)
      usage
      exit 1
      ;;
  esac
done

[[ -z "$LDAP_USR" || -z "$LDAP_PWD" ]] && { usage; exit 1; }

echo "++ INFO ++    LDAP Username: $LDAP_USR"

if [[ "$ENABLE_PROXY" = true ]]; then
  echo "!! WARN !!    IITM remote proxy is enabled"
  export HTTPS_PROXY="https://${LDAP_USR}:${LDAP_PWD}@remote.iitm.ac.in:8372"
fi

# Login
post_login_url=$(curl \
  -kLs \
  -o /dev/null \
  --ciphers ':HIGH:!DH:!aNULL' \
  -c "$tmpfile" \
  -X POST \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d "userLogin=${LDAP_USR}&userPassword=${LDAP_PWD}&submit=" \
  -w %{url_effective} \
  https://netaccess.iitm.ac.in/account/login
)

# Verify login
if [[ "$post_login_url" == "https://netaccess.iitm.ac.in/account/index" ]]; then
  echo "++ INFO ++    Logged in"
else
  echo "-- FAIL --    Login failed, try connecting manually"
  exit 1
fi

# Approve machine
curl \
  -kLs \
  -o /dev/null \
  --ciphers ':HIGH:!DH:!aNULL' \
  -b "$tmpfile" \
  -X POST \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d "duration=2&approveBtn=" \
  https://netaccess.iitm.ac.in/account/approve \
  && \
    echo "++ INFO ++    Request sent to approve machine" \
  || \
    { echo "-- FAIL --    Error sending request to approve machine" ; exit 1; }