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#!/usr/bin/env bash

passwdhost="passwd.cyberleo.net"

init() {
  cookiejar="$(mktemp cookie.jar.XXXXXXXX)"
  certstore="$(mktemp gd_bundle.crt.XXXXXXXX)"
  cat > "${certstore}" <<EOF
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
EOF
  trap "rm -f '${cookiejar}' '${certstore}'" exit hup int term kill
}

pebkac() {
  if [ "${#}" -gt 0 ]
  then
    echo "${*}" >&2
    echo "" >&2
  fi
  echo "Usage: $(basename "${0}") <username> <password> [times]" >&2
  echo "This utility will shuffle your password through an arbitrary number of" >&2
  echo "resettings, to thwart silly password reusage restrictions." >&2
  echo "" >&2
  echo "******* WARNING ********" >&2
  echo "This script will RESET YOUR PASSWORD!" >&2
  echo "PAY ATTENTION to the output! If it fails halfway through, you will NEED to" >&2
  echo " know the last password it was successfully set to, so you can fix it yourself!" >&2
  echo " If you do not pay attention, expect to contact helpdesk for a password reset." >&2
  echo "******* WARNING ********" >&2
  echo "" >&2
  exit 1
}

httpget() {
  wget -qO- --ca-certificate=gd_bundle.crt --load-cookies="${cookiejar}" --save-cookies="${cookiejar}" --keep-session-cookies "$(printf "${@}")"
  _res=$?

  [ "${_res}" -gt 0 ] && echo "Service error: failed with status ${_res}" >&2

  return "${_res}"
}

login() {
  [ "${username}" -a "${password}" ] || return 1

  if httpget "https://${passwdhost}/" > /dev/null
  then
    if res="$(httpget "https://${passwdhost}/session_login.cgi?user=%s&pass=%s" "${username}" "${password}")"
    then
      err="$(echo "${res}" | grep -i "failed")"
      if [ "${?}" -eq 0 ]
      then
        echo "Failure: ${err}" >&2
        return 1
      fi
    else
      return 1
    fi
  else
    return 1
  fi
  return 0
}

chpass() {
  old="${1}"
  new="${2}"
  [ "${old}" -a "${new}" ] || return 1

  if res="$(httpget "https://${passwdhost}/changepass/changepass.cgi?old=%s&new1=%s&new2=%s" "${old}" "${new}" "${new}")" &&
    ! err="$(echo "${res}" | grep -i "failed")"
  then
    echo "Password changed." >&2
    return 0
  else
    echo "Failure: ${err}" >&2
    return 1
  fi
}

logout() {
  httpget "https://${passwdhost}/session_login.cgi?logout=1" > /dev/null
  rm -f "${cookiejar}"
  return 0
}

um_passwd() {
  username="${1}"
  password="${2}"
  times="${3:-5}"

  [ "${username}" -a "${password}" ] || pebkac
  case "${times}" in
  [0-9]*)
    true ;;
  *)
    pebkac "'times' should be an integer" ;;
  esac

  init

  if login
  then
    oldpass="${password}"
    newpass=""
    for iter in $(seq 1 "${times}")
    do
      newpass="$(printf "%s_%02u" "${password}" "${iter}")"
      echo "chpass: ${oldpass} -> ${newpass}"
      chpass "${oldpass}" "${newpass}" || return 1
      sleep 1
      oldpass="${newpass}"
    done
    echo "chpass: ${oldpass} -> ${password}"
    chpass "${oldpass}" "${password}" || return 1
    logout
    return 0
  else
    logout
    return 1
  fi
}

[ "${1}" = "-h" ] && pebkac
um_passwd "${@}" || echo "Something failed! Read the errors carefully!" >&2