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======Password Strength Checking Script======

You can tell VPOP3 to enforce password strength checks by using a Lua script which performs the checks for you.

The Lua script can be edited in Settings -> Scripts and is called **passwordcheck.lua** (in older versions of VPOP3 it is stored in a file called **passwordcheck.lua** in the VPOP3 directory). VPOP3 calls a function called **Check** which should have the following prototype:

  Check(<username>, <password>, <min password length>)

(where '<min password length>' is the minimum length set in Settings -> Security in the VPOP3 settings)

This function should return a boolean value to say whether the password is allowed or not (true = allowed, false = not allowed)

A simple example to prevent the password being the same as the username or 'password' would be:

<code>
function Check(Username, Password, minlength)
 if Password == Username or Password == 'password' then
  return false
 else
  return true
 end
end
</code>

A more complex example is:
<code>
blockedWords = {"password", "letmein", "computer"}
minTypes = 3

function Check(Username, Password, minlength)
 local lowerPassword = string.lower(Password)
 if Password == string.lower(Username) then
     return false
 end

  for _, value in pairs(blockedWords) do
    if lowerPassword == value then
      return false
    end
  end

 local hasDigit = 0
 local hasCaps = 0
 local hasLower = 0
 local hasSpecial = 0
 if string.find(Password, "%d") then
    hasDigit = 1
 end
 if string.find(Password, "[A-Z]") then
    hasCaps = 1
 end
 if string.find(Password, "[a-z]") then
     hasLower = 1
 end
 if string.find(Password, "[^a-zA-Z0-9]") then
     hasSpecial = 1
 end
 local differentTypes = hasDigit + hasCaps + hasLower + hasSpecial
 
 if differentTypes >= minTypes then
     return true
 else
     return false
 end
end
</code>

If you need, we can produce a script for you, but there would be a cost for this - contact [[support@pscs.co.uk]] with a specification for a quote. (The price is usually £50 + VAT for a simple case)
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