Yesterday I had the opportunity to speak at the Granite State Code Camp (#gscc) in Burlington, MA. As part of my series of talks on Running Azure Securely, my talk today was around defense in depth and was called Running Azure Securely – which of these Azure security features are for me?. The session was interactive, engaging a third-of-a-dozen folks in the audience in a discussion of how to defend various workloads using the (fictitious) page of photos app as a foil.
Slide deck attached.
Also perhaps of interest – a similar talk from the other Burlington – at the recent VT Code Camp – which has a few add’l resources listed: https://blog.codingoutloud.com/2019/09/28/talk-running-azure-securely-are-all-these-security-features-for-me/
On 22-Oct-2019 I spoke at Boston Azure about network security and focused on some of the edges of using Azure DNS, and included some DNS subdomain hijacking awareness.
dig CNAME bostonazuredemo.azuresecurely.com +short
will check public DNS records for a CNAME, returning whatever it is mapped to, if anything.
In the above screenshot:
- nothing returned from dig – this is before any DNS entry was created for the demo subdomain
- a cascade of CNAMES are returned from dig – this is after a DNS entry was created for the demo subdomain – and it pointed at an Azure Web App — the cascade here includes my subdomain => an azurewebsites.net subdomain (bostonazuredemo.azurewebsites.net) => a second azurewebsites.net subdomain (waws-prod-dm1-139.sip….) => a cloudapp.net domain => and finally an IP address
- a single CNAME is returned from dig – this is after the Azure Web App was deleted (), but the DNS subdomain entry (bostonazuredemo.azuresecurely.com) was left intact – creating a dangling subdomain at risk of being hijacked — anyone who registered bostonazuredemo.azurewebsites.net (and it was open for anyone) would automatically have bostonazuredemo.azuresecurely.com already wired up to it.
- a cascade of CNAMES are returned from dig – but different than the first – this is after bostonazuredemo.azurewebsites.net was registered again, by a hacker, and bostonazuredemo.azuresecurely.com was hijacked
Some other notes from the session:
Subdomain takeover examples:
Today I had the opportunity to speak at VT Code Camp #11 in Burlington, VT. As part of my series of talks on Running Azure Securely, my talk today was around defense in depth and was called Running Azure Securely – which of these Azure security features are for me?. The session was interactive, engaging a half-dozen folks in the audience in a discussion of how to defend various workloads using the (fictitious) page of photos app as a foil.
Some Resources Mentioned
Azure offers thousands of security features. Some of them are easy to use and others are complicated. Some are free to use and some look really, really expensive. Which ones should I be using for my applications?
In this talk we’ll look at some ways to reason about which security controls you might want to apply and why. We’ll consider groups of Azure security features through a pragmatic lens of security best practices and defense-in-depth/breadth, but tempered by the reality that “more security” is not always the answer, but rather “what is the right security” for a situation. By the end of this talk you should have a better idea of the security feature set offered by Azure, why/when they might or might not be needed, and have discussed some ways to reason about how which are relevant you by helping you think about how to assess appropriately for multiple situations.
Do you have specific questions about the applicability of Azure security features already? Feel free to tweet your questions at Bill in advance to @codingoutloud and he’ll try to work answers to any questions into the talk in advance.
(if I can find one)
Today I had the opportunity to speak at SQL Saturday #877 in Burlington, MA. As part of my series of talks on Running Azure Securely, my talk today was Running Azure SQL Database Securely and applied to Azure SQL DB and Azure SQL DB Managed Instances.
Some Resources Mentioned
Running Azure SQL DBs Securely – Bill Wilder – SQL Saturday #877 – 14-Sep-2019
If you know your way around SQL Server, then you will find Azure SQL Database to be familiar territory. But some aspects are more familiar than others, which is especially true for security-related differences.
In this session we review the key differences around identity management and authentication (including multi-factor authentication), managing server credentials (or, even better, not needing to in some cases), how to audit logins (probably not what you expect), an overview of encryption and data masking options, and the supporting role of Azure Key Vault. We will also touch on compliance and disaster recovery to give the complete picture of powerful features you’ll definitely want to know about to protect your data.
This talk will cover relevant capabilities for both traditional Azure SQL Databases and the newer Azure SQL Managed Instances.
This talk assumes you are already familiar with SQL Server or another enterprise database.
(Credit Taiob Ali @SqlWorldWide)
On Tuesday July, 30, 2019 I had the opportunity to speak at North Boston Azure. The talk was part of a series on Running Azure Securely and was called Are all these Azure security features for me? and was not really a “talk” in that it was highly interactive. For those who attended, you will recall we filled in some slides collaboratively. Thus, they may not appear so polished for those of you who did not join live. Either way, please find the slides (“collaborative” and all) below.
This was an experimental approach for me and the feedback from the audience tells me it worked pretty well. The group at North Boston Azure was already knowledgeable and engaged, so hopefully made for a interesting experience for all involved (was certainly fun for me).
You can follow me on Twitter (@codingoutloud).
You can also follow Boston Azure on Twitter (@bostonazure).
We had a great event at MIT on Saturday 27-April-2019 — the Boston Azure edition of the Global Azure Bootcamp hosted at MIT. There were lots of great session contributions – making this a true community effort.
Big thank you to local organizers Olimpia (@olimpiaestela), Veronika (@breakpointv16), Gladis, and Maura (@squdgy). We all worked closely with Jason (@haleyjason) who ran the Burlington MA event. And don’t forget those folks at the Global Azure Bootcamp level providing a platform making this possible for a coordinated day of #Global Azure cloudiness (https://global.azurebootcamp.net/).
The thanks continue with sponsors: MIT Women in Technology, Insight (formerly Blue Metal – https://www.insight.com/en_US/solve/digital-innovation.html), Finomial, and the Global Sponsors (https://global.azurebootcamp.net/sponsors/).
And a big thank you to the speakers – all who gave up a chunk of weekend to join us on a Saturday to share their knowledge (in order of appearance):
Attached are my slides:
The above graphic is from here: https://docs.microsoft.com/en-us/azure/event-grid/overview#event-sources
Here are some more links of interest:
- Some collected links (some repeated below): https://github.com/codingoutloud/bostonazurebootcamp2019/blob/master/README.md
- C# Script is real – not a hoax! 🙂 – https://msdn.microsoft.com/en-us/magazine/mt614271.aspx
- Azure Functions support C# Script (.csx files) – but also regular compiled C# (.cs on .NET Core)
- Example Azure Function written in regular compiled C#: https://github.com/codingoutloud/opstoolbox (especially https://github.com/codingoutloud/opstoolbox/blob/master/SslCertificateExpirationChecker.cs)
- Here are some example uses of the above:
- Event Grid:
- “Slide” I showed is below – it is from here: https://docs.microsoft.com/en-us/azure/event-grid/media/overview/functional-model.png
- Combine Azure Logic Apps with Azure Functions – https://docs.microsoft.com/en-us/azure/logic-apps/logic-apps-azure-functions#add-function-logic-app
- Similar to “follow-along lab” that tied together Subscription changes to an Azure Function using EventGrid
- Azure Blockchain Workbench:
Ever try to figure out how to track who logged into your Azure SQL database? You checked all the usual ways you might handle that with a SQL Server database, but one-by-one find out they just don’t work. Here’s one way to do it.
To track who is logging into your Azure SQL database, enable auditing (here’s how to do that) with audit entries directed to an Azure storage blob. There are two ways to do this: at the database server level and at the individual database level. Either is fine, but for the example that follows, auditing is assumed to be at the db server level. The example query can be adjusted to work with auditing at the database level, but one of the two auditing options is definitely required to be on!
Run this query to find out all the principals (users) who have logged in so far today into your Azure SQL database.
The output is something like the following, assuming if I’ve logged in 12 times so far today with my AAD account (email@example.com) and 1 time with a database-specific credential (myadmin):
09-Nov-2019 (Saturday) firstname.lastname@example.org 12
09-Nov-2019 (Saturday) myadmin 1
The query might take a while time to run, depending on how much data you are traversing. In one of my test environments, it takes nearly 20 minutes. I am sure it is sensitive the amount of data you are logging, database activity, and maybe settings on your blob (not sure if premium storage is supported, but I’m not using it and didn’t test with it).
Note: There are other ways to accomplish this, but every way I know of requires use of Azure SQL auditing. In this post we pushed them to blobs, but other destinations are available. For example, you could send to Event Hubs for a more on-the-fly tracker.