GENERATING A SECURE RANDOM PASSWORD WITH VREALIZE ORCHESTRATOR (VRO/VCO)

Written by Sam McGeown on 6/1/2015 · Read in about 3 min (502 words)
Published under vRealize Orchestrator

It’s a fairly common requirement when creating a new user to assign a randomly generated password, so during a recent engagement I wrote a little password generator to do that. I wanted to be able to chose whether special characters were used, and the length of the password - typically if the password doesn’t used special characters I would increase the length significantly!

Characters should be randomly picked from:

  • a-z
  • A-Z
  • 0-9
  • (optional) ASCII special characters

Inputs

  • passwordLength - the length of the password to be generated (number)
  • excludePunctuation - exclude the use of special characters if TRUE (boolean)

Outputs

  • generatedPassword - the generated password (SecureString)

The SecureString type prevents the string from being displayed in the workflow attributes - it can be used as a normal string, but will be asterisk’d when displayed. Only a very slight security increase, but a nice touch.

Schema

A very, very simple schema - one scriptable task!

The Script

I’ve heavily commented the script, so that hopefully anyone can follow it:

 

function getNum() {
	// Generate a random number between 33 and 126
    return ((parseInt((Math.random()) * 1000) % 94) + 33);
}

function isPunctuation(num) {
	// ASCII characters 33-47, 58-64, 91-96 and 123-126 are punctuation
    if (((num >=33) && (num <=47)) || ((num >=58) && (num <=64)) || ((num >=91) && (num <=96)) || ((num >=123) && (num <=126))) { return true; }
    return false;
}
// Initialise a string
var strPassword = "";
// Count over the password length
for (i=0; i < passwordLength; i++) {
	// Get a random number
	nextCharacter = getNum();
	// If we are excluding punctuation
	if (excludePunctuation) {
		// Check if the random number is punctuation and get a new one until it's not
		while (isPunctuation(nextCharacter)) {
			nextCharacter = getNum();
		}
	}
	// Add the character to the string password
	strPassword = strPassword + String.fromCharCode(nextCharacter);
}
// Write the password to the log - for testing only!
System.log("Secure password generated: " + strPassword);
// Assign the string to the secureString Output parameter.
generatedPassword = strPassword;

Testing

The proof of the pudding is in the eating, as they say! I’ve left a line in the script to log the plaintext of the password so that it can be tested - that should be commented out or deleted if you’re planning on using the script!

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  <a href="/images/2015/01/image39.png"><img style="background-image: none; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px; border: 0px;" title="image" src="/images/2015/01/image_thumb39.png" alt="image" width="376" height="139" border="0" /></a><a href="/images/2015/01/image40.png"><br /> <img style="background-image: none; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border: 0px;" title="image" src="/images/2015/01/image_thumb40.png" alt="image" width="376" height="111" border="0" /></a>
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  <a href="/images/2015/01/image41.png"><img style="background-image: none; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px; border: 0px;" title="image" src="/images/2015/01/image_thumb41.png" alt="image" width="376" height="139" border="0" /></a><br /> <a href="/images/2015/01/image42.png"><img style="background-image: none; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border: 0px;" title="image" src="/images/2015/01/image_thumb42.png" alt="image" width="376" height="113" border="0" /></a>
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13 Characters with punctuation
20 Characters, without punctuation

Download

You can download the workflow here - New-SecurePassword (zip)

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