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@OllieJones
OllieJones / queue.js
Created Feb 9, 2019
Queue class, super simple, based on Kate Morley's queue code.
View queue.js
'use strict';
/*
Queue.js
A class to represent a queue
Created by Kate Morley - https://code.iamkate.com/ - and released under the terms
of the CC0 1.0 Universal legal code:
View embl-browser.js
'use strict';
/*globals ebml */
if ( !window.ebml ) window.ebml = {};
ebml.EbmlDecoder = function EbmlDecoder( options ) {
var schema = {
"80": {
@OllieJones
OllieJones / streamPeek.js
Last active Sep 5, 2018
Read useful information from a MP4 data stream
View streamPeek.js
/*
* this code examines a MP4 data stream.
* it looks at the appropriate atoms to determine width, height, and frame rate.
*
* It is a sleazy approach, the equivalent of grepping for necessary
* boxes rather than using box lengths to parse the file.
*/
function read32( buff, fourcc, offset ) {
let start = 0;
@OllieJones
OllieJones / validateGithubWebhook.js
Created Oct 5, 2017
Github webhooks use a shared secret for validation. The webhook itself contains a header X-Hub-Signature containing a hash of the webhook body. This function checks that hash against the body.
View validateGithubWebhook.js
'use strict';
const crypto = require( 'crypto' );
function validateGithub( secret, signature, rawBody ) {
if( (!signature) || signature.length === 0 ) return false;
if( (!rawBody) || rawBody.length === 0 ) return false;
try {
const splits = signature.split( '=' );
@OllieJones
OllieJones / nonce.js
Created Oct 3, 2017
Snippets of Javascript.
View nonce.js
'use strict';
/* node.js nonce: crypto-quality random session key (filename safe base64, rfc4648) */
const btoa = require( 'btoa' );
const crypto = require( 'crypto' );
function nonce( length ) {
const rndLen = 1+(( (length)+(length<<1) +3)>>2);
const randomArray = crypto.randomBytes( rndLen );
@OllieJones
OllieJones / explanation.md
Last active Jul 20, 2016
Detecting a disconnected RDP session in a unix / linux / bsd server.
View explanation.md

Here is a way to obtain a list of disconnected xrdp sessions. It relies on the fact that the xrdp server is, in normal X session manager usage, the only client that establishes a TCP connection to the Xvnc X Window System display server. (The other client programs -- the ones doing things for the user -- use UNIX-domain sockets for their display connections).

When an xrdp session is active, the associated Xvnc display server has two TCP connections, one in the ESTABLISHED state, and the other in the LISTEN state. That looks something like this using the lsof(1) program.

$ sudo lsof  -b -w -n -c /^Xvnc$/b -a -iTCP:5900-5999 
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
Xvnc    1625 guest    1u  IPv4 252910      0t0  TCP 127.0.0.1:5910 (LISTEN)
Xvnc    1625 guest    9u  IPv4 261226      0t0  TCP 127.0.0.1:5910->127.0.0.1:35242 (ESTABLISHED)

If the user of the remote session abandons it by closing the RDP connection (or, in the case of an Apache Guacamole RDP session

@OllieJones
OllieJones / DataTableResultSet.cs
Last active Sep 20, 2019
C# code for handling Ajax calls for the DataTables.net client table-rendering plugin.
View DataTableResultSet.cs
/// <summary>
/// Resultset to be JSON stringified and set back to client.
/// </summary>
[Serializable]
[SuppressMessage("ReSharper", "InconsistentNaming")]
public class DataTableResultSet
{
/// <summary>Array of records. Each element of the array is itself an array of columns</summary>
public List<List<string>> data = new List<List<string>>();
View ActivateSigAlgoritms.cs
CryptoConfig.AddAlgorithm(typeof(RsaPkCs1Sha512SignatureDescription),
"http://www.w3.org/2001/04/xmldsig-more#rsa-sha512");
CryptoConfig.AddAlgorithm(typeof(RsaPkCs1Sha384SignatureDescription),
"http://www.w3.org/2001/04/xmldsig-more#rsa-sha384");
CryptoConfig.AddAlgorithm(typeof(RsaPkCs1Sha256SignatureDescription),
"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
@OllieJones
OllieJones / AddSignatureAlgs.cs
Created Mar 4, 2016
Add this code to your dotnet app to enable rsa-sha256, rsa-384, and rsa-512 signatures.
View AddSignatureAlgs.cs
/// <summary>Declare the signature type for rsa-sha512</summary>
public class RsaPkCs1Sha512SignatureDescription : SignatureDescription
{
public RsaPkCs1Sha512SignatureDescription()
{
KeyAlgorithm = typeof(RSACryptoServiceProvider).FullName;
DigestAlgorithm = typeof(SHA512CryptoServiceProvider).FullName;
FormatterAlgorithm = typeof(RSAPKCS1SignatureFormatter).FullName;
DeformatterAlgorithm = typeof(RSAPKCS1SignatureDeformatter).FullName;
}
@OllieJones
OllieJones / RandomString.sql
Last active Feb 25, 2016
Cryptographic quality random text string generation in SQL Server
View RandomString.sql
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Description: Generate a 20-character cryptographically secure random string of uppercase letters and digits.
--- The entropy of such a string is about 100 bits: plenty.
-- Reference: https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e4b5a6d1-1068-41e1-abd7-b3ec51d3f1c3/create-function-error?forum=transactsql
-- =============================================
CREATE VIEW RandomSeqView AS
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