Simon Willison’s Weblog

Microsoft Flight Simulator: WebAssembly (via) This is such a smart application of WebAssembly: it can now be used to write extensions for Microsoft Flight Simulator, which means you can run code from untrusted sources safely in a sandbox. I’m really looking forward to more of this kind of usage—I love the idea of finally having a robust sandbox for running things like plugins. # 24th November 2022, 2:08 am

Does Company ‘X’ have an Azure Active Directory Tenant? (via) Neat write-up from Shawn Tabrizi about looking up if a company has Active Directory single-sign-on configured (which is based on OpenID) by checking for an OpenID configuration endpoint. I particularly enjoyed this new-to-me trick: Google’s “I’m Feeling Lucky” search button redirects to the first result, which means it can double as an unofficial API endpoint for returning the URL of the first matching search result. # 1st October 2022, 8:15 pm

Microsoft® Open Source Software (OSS) Secure Supply Chain (SSC) Framework Simplified Requirements. This is really good: don’t get distracted by the acronyms, skip past the intro and head straight to the framework practices section, which talks about things like keeping copies of the packages you depend on, running scanners, tracking package updates and most importantly keeping an inventory of the open source packages you work so you can quickly respond to things like log4j.

I feel like I say this a lot these days, but if you had told teenage-me that Microsoft would be publishing genuinely useful non-FUD guides to open source supply chain security by 2022 I don’t think I would have believed you. # 6th August 2022, 4:49 pm

Visual Studio Code: Development Process (via) A detailed description of the development process used by VS Code: a 6-12 month high level roadmap, then month long iterations that each result in a new version that is shipped to users. Includes details of how the four weeks of each iteration are spent too. # 20th July 2022, 4:34 pm

Monaco Editor. VS Code is MIT licensed and built on top of Electron. I thought “huh, I wonder if I could run the editor component embedded in a web app”—and it turns out Microsoft have already extracted out the code editor component into an open source JavaScript package called Monaco. Looks very slick, though sadly it’s not supported in mobile browsers. # 21st May 2019, 8:47 pm

Google and Microsoft Cheat on Slow-Start. Should You? Fascinating optimisation tricks by some of the big websites, which violate the RFC governing the TCP slow-start algorithm in order to perform better in the common case. # 3rd December 2010, 7:03 pm

S.Korea ends Microsoft’s online shopping monopoly. The crazy rules mandating Active X based encryption for government and e-commerce sites have finally been dropped, after the Korea Communications Commission found them “unfit for a new Internet environment involving smartphones”. # 5th July 2010, 8:21 am

Internet Explorer Platform Preview Guide for Developers (via) Lots of SVG and CSS3 stuff, no mention of canvas here either though. # 16th March 2010, 6:36 pm

An Early Look At IE9 for Developers (via) Surprisingly, no mention of SVG or canvas and only a note in passing about HTML 5. # 16th March 2010, 6:11 pm

Negative Cashback from Bing Cashback (via) Some online stores show you a higher price if you click through from Bing—and set a cookie that continues to show you the higher price for the next three months. It’s unclear if this is Bing’s fault—comments on Hacker News report that Google Shopping sometimes suffers from the same problem (POST UPDATED: I originally blamed Bing for this). # 23rd November 2009, 9:24 pm

IE 6 and 7 hit by hack attack code. IE6 and 7 have what looks like a buffer overflow vulnerability caused by a strange intersection of CSS, innerHTML and large JavaScript arrays. No exploits in the wild yet but it’s only a matter of time. # 22nd November 2009, 3:38 pm

Major IE8 flaw makes ’safe’ sites unsafe. IE8 has an XSS protection feature which rewrites potentially harmful code in HTML pages—I think it looks for suspicious input in query strings which appears to have been output directly on the page. Unfortunately it turns out there’s a flaw in the feature that can allow attackers to rewrite safe pages to introduce XSS flaws. Google are serving all of their pages with the X-XSS-Protection: 0 header. Until the fix is released, that’s probably a good idea. # 22nd November 2009, 3:34 pm

Microsoft backs long life for IE6. Oh FFS... “The software giant said it would support IE6 until 2014—four years beyond the original deadline.” # 14th August 2009, 2:53 pm

Farewell to Mashup Editor. It’s not just Microsoft Popfly that’s shutting down—Google Mashup Editor will be gone in four weeks time (this was announced in January). You get to keep your code, but I don’t know enough about Mashup Editor to know if the code is usable once the system has shut down. # 17th July 2009, 1:05 pm

Popfly Shutting Down. Yet another reminder that building stuff on a closed-source platform (especially a hosted service) is risky business, even from a vendor as large as Microsoft. This certainly won’t help them make the case for Azure. # 17th July 2009, 9:32 am

From Microsoft: C# and CLI under the Community Promise. Microsoft’s assurance that it won’t “assert its Necessary Claims” against alternative (including open source) implementations of the ECMA C# and CLR specifications. The promise doesn’t cover implementations of .NET, WinForms etc- so the Mono team have announced they will be splitting their project in to two packages—a safe, ECMA based package and a package containing everything else. # 7th July 2009, 11:15 am

Imminent Death of the Net Predicted. Well, maybe not, but the way Windows Vista deals with round-robin DNS A records (using a new IPv6 algorithm from RFC3484 backported to IPv4) means that domains that serve up multiple A records to load balance between data centres will find that the IP nearest to the 192.168.* range will get the vast majority of Vista traffic. # 5th March 2009, 9:50 am

Microsoft: Big Security Hole in All IE Versions. Looks like a 0-day that’s being actively exploited. # 16th December 2008, 8:26 pm

Windows Live Adds Support For OpenID. I hope they include the option to log in to the provider using CardSpace, to address phishing. # 27th October 2008, 9:34 pm