Is it possible to detect that I am running under Virtual Machine from the code of Action Script3 (or lower)?
I know there is Capabilities class that providers some info about the system, but it doesn't seem to fit my needs fully.
Perhaps there is no such a flag anywhere, but I can count on some indirect information to understand that environment is virtualized?
Regards,
Sergey.
I doubt that checking this would be easy, especially from such an isolated enviroment as browser plugin sandbox. Modern virtual machines can emulate everything very accurately down to CPU registers and it is often hard to detect a vm even when you can access regular OS APIs. And when running in a browser you don't even have that (with AIR, you could write a native extension). You can check this thread for some info that may prove useful.
I will develop a game with server/client pattern. Client and server communicated through TCP socket. And for the server's data security, we encrypted our data stream with some key.
But here's the problem, the actionscript code be easily decompiled with tools. So the key is NOT safe even after obfuscation. You can still restore it if you like to spend more time.
I also checked FlashCC project but it will cost us when combined stage3d.
So is there anyway to hide my key?
Use asymmetric encryption TLS or SSL over socket. Although flash player 11 has native SecureSocket it has some problems, so I recommend you TLSSocket from as3cryptolib (here is the fork of the last version of official as3crypto lib with some critical fixes from the issues list)
I've come to the conclusion that you can't have a 100% unbreakable swf. The only thing you can do is to multiply the obstacles to discourage the hacker.
As said in a comment, the safest method would be to have the whole game logic on the server and let the server compute the scores (or other sensitive data) itself. But depending on the type of game, this may be a really stupid idea.
I'm developing on super fast fibre optic connection.
I want a tool that allows me to test web sites at certain preset speeds for example - I want to feel the experience of my site loading at modem speeds, then perhaps 1mbps, 2mbps, etc.
Basically I want to be able to set the speed of the connection so that I get the real feel of the site loading remotely from other countries and connections.
Anyone know of such a tool?
WANEM is a nice open source solution that can simulate Network delay, Packet loss, Packet corruption, Disconnections, Packet re-ordering, Jitter, etc.
It also supports a mode of operation that only uses one network-interface, which makes it super quick to set up a test environment.
EDIT
Although WANEM is a Linux application, you only need to burn the bootable CD and start a machine with that CD, no need to sacrifice a machine to run WANEM. If even that's not an option you can also download it as a virtual appliance that runs in a VMWare Workstation ($$), VMWare Player (free) or VMWare Server (free).
However, in my opinion(based on real usage of such products) it's really easier to have the "network simulator" on a separate machine instead of loading it on either the server or the client under test. And as explained above, thanks to the bootable cd option that can be any machine you have lying around - we typically use decommissioned desktops and notebooks for this purpose.
there are a lot of tools outside like:
http://www.netlimiter.com/
http://www.antamediabandwidth.com/
...
basically the most of them work likes proxies
I really know nothing about securing or configuring a "live" internet facing web server and that's exactly what I have been assigned to do by management. Aside from the operating system being installed (and windows update), I haven't done a thing. I have read some guides from Microsoft and on the web, but none of them seem to be very comprehensive/ up to date. Google has failed me.
We will be deploying a MVC ASP.NET site.
What is your personal check when you are getting ready to deploy a application on a new windows server?
This is all we do:
Make sure Windows Firewall is enabled. It has an "off by default" policy, so the out of box rule setup is fairly safe. But it never hurts to turn additional rules off, if you know you're never going to need them. We disable almost everything except for HTTP on the public internet interface, but we like Ping (who doesn't love Ping?) so we enable it manually, like so:
netsh firewall set icmpsetting 8
Disable the Administrator account. Once you're set up and going, give your own named account admin rights. Disabling the default Administrator account helps reduce the chance (however slight) of someone hacking it. (The other common default account, Guest, is already disabled by default.)
Avoid running services under accounts with administrator rights. Most reputable software is pretty good about this nowadays, but it never hurts to check. For example, in our original server setup the Cruise Control service had admin rights. When we rebuilt on the new servers, we used a regular account. It's a bit more work (you have to grant just the rights necessary to do the work, instead of everything at once) but much more secure.
I had to lockdown one a few years ago...
As a sysadmin, get involved with the devs early in the project.. testing, deployment and operation and maintenance of web apps are part of the SDLC.
These guidelines apply in general to any DMZ host, whatever OS linux or windows.
there are a few books deicated to IIS7 admin and hardening but It boils down to
decide on your firewall architecture and configuration and review for appropriateness. remember to defend your server against internal scanning from infected hosts.
depending on the level of risk consider a transparent Application Layer gateway to clean the traffic and make the webserver easier to monitor.
1, you treat the system as a bastion host. locking down the OS, reducing the attack surface(services, ports installed apps ie NO interactive users or mixed workloads, configure firewalls RPC to respond only to specified management DMZ or internal hosts).
consider ssh, OOB and/or management LAN access and host IDS verifiers like AIDE tripwire or osiris.
if the webserver is sensitive, consider using argus to monitor and record traffic patterns in addition to IIS/FW logs.
baseline the system configuration and then regularly audit against the base line, minimizing or controlling changes to keep this accurate. automate it. powershell is your friend here.
the US NIST maintain a national checklist program repository. NIST, NSA and CIS have OS and webserver checklists worth investigating even though they are for earlier versions. look at the apache checklists as well for configuration suggestions. review the addison wesley and OReilly apache security books to get a grasp of the issues.
http://checklists.nist.gov/ncp.cfm?prod_category://checklists.nist.gov/ncp.cfm?prod_category
http://www.nsa.gov/ia/guidance/security_configuration_guides/web_server_and_browser_guides.shtml
www.cisecurity.org offer checklists and benchmarking tools for subscribers. aim for a 7 or 8 at a minimum.
Learn from other's mistakes (and share your own if you make them):
Inventory your public facing application products and monitor them in NIST's NVD(vulerability database..) (they aggregate CERT and OVAL as well)
subscribe and read microsoft.public.iinetserver.iis.security and microsoft security alerts. (NIST NVD already watches CERT)
Michael Howard is MS's code security guru, read his blog (and make sure your dev's read it too) it's at: http://blogs.msdn.com/michael_howard/default.aspx
http://blogs.iis.net/ is the IIS teams blog. as a side note if you're a windows guy, always read the team blog for MS product groups you work with.
David Litchfield has written several books on DB and web app hardening. he is a man to listen to. read his blog.
If your dev's need a gentle introduction to (or reminder about) web security and sysadmins too! I recommend "Innocent code" by Sverre Huseby.. havent enjoyed a security book like that since a cookoo's egg. It lays down useful rules and principles and explains things from the ground up. Its a great strong accessible read
have you baselined and audited again yet? ( you make a change you make a new baseline).
Remember, IIS is a meta service (FTP.SMTP and other services run under it). make your life easier and run a service at a time on one box. backup your IIS metabase.
If you install app servers like tomcat or jboss on the same box ensure that they are secured and locked down too..
secure web management consoles to these applications, IIS included.
IF you have to have DB on the box too. this post can be leveraged in a similar way
logging.an unwatched public facing server (be it http, imap smtp) is a professional failure. check your logs pump them into an RDMS and look for the quick the slow and the the pesky. Almost invariably your threats will be automated and boneheaded. stop them at the firewall level where you can.
with permission, scan and fingerprint your box using P0f and nikto. Test the app with selenium.
ensure webserver errors are handled discreetly and in a controlled manner by IIS AND any applications. , setup error documents for 3xx, 4xx and 5xx response codes.
now you've done all that, you've covered your butt and you can look at application/website vulnerabilities.
be gentle with the developers, most only worry about this after a breach and reputation/trust damage is done. the horse has bolted and is long gone. address this now. its cheaper. Talk to your dev's about threat trees.
Consider your response to Dos and DDoS attacks.
on the plus side consider GOOD traffic/slashdotting and capacity issues.
Liase with the Dev's and Marketing to handle capacity issues and server/bandwidth provisioning in response to campaigns/sales new services. Ask them what sort of campaign response theyre expec(or reminting.
Plan ahead with sufficient lead time to allow provisioning. make friends with your network guys to discuss bandwidth provisioing at short notice.
Unavailabilty due to misconfiguration poor performance or under provisioning is also an issue.. monitor the system for performance, disk, ram http and db requests. know the metrics of normal and expected performance.. (please God, is there an apachetop for IIS? ;) ) plan for appropriate capacity.
During all this you may ask yourself: "am I too paranoid?". Wrong question.. it's "am I paranoid enough?" Remember and accept that you will always be behind the security curve and that this list might seem exhaustive, it is but a beginning. all of the above is prudent and diligent and should in no way be considered excessive.
Webservers getting hacked are a bit like wildfires (or bushfires here) you can prepare and it'll take care of almost everything, except the blue moon event. plan for how you'll monitor and respond to defacement etc.
avoid being a security curmudgeon or a security dalek/chicken little. work quietly and and work with your stakeholders and project colleagues. security is a process, not an event and keeping them in the loop and gently educating people is the best way to get incremental payoffs in term of security improvements and acceptance of what you need to do. Avoid being condescending but remember, if you DO have to draw a line in the sand, pick your battles, you only get to do it a few times.
profit!
Your biggest problem will likely be application security. Don't believe the developer when he tells you the app pool identity needs to be a member of the local administrator's group. This is a subtle twist on the 'don't run services as admin' tip above.
Two other notable items:
1) Make sure you have a way to backup this system (and periodically, test said backups).
2) Make sure you have a way to patch this system and ideally, test those patches before rolling them into production. Try not to depend upon your own good memory. I'd rather have you set the box to use windowsupdate than to have it disabled, though.
Good luck. The firewall tip is invaluable; leave it enabled and only allow tcp/80 and tcp/3389 inbound.
use the roles accordingly, the less privileges you use for your services accounts the better,
try not to run all as an administrator,
If you are trying to secure a web application, you should keep current with information on OWASP. Here's a blurb;
The Open Web Application Security
Project (OWASP) is a 501c3
not-for-profit worldwide charitable
organization focused on improving the
security of application software. Our
mission is to make application
security visible, so that people and
organizations can make informed
decisions about true application
security risks. Everyone is free to
participate in OWASP and all of our
materials are available under a free
and open software license. You'll
find everything about OWASP here on
our wiki and current information on
our OWASP Blog. Please feel free to
make changes and improve our site.
There are hundreds of people around
the globe who review the changes to
the site to help ensure quality. If
you're new, you may want to check out
our getting started page. Questions or
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you see here and want to support our
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For your deployment (server configuration, roles, etc...), their have been a lot of good suggestions, especially from Bob and Jeff. For some time attackers have been using backdoor's and trojans that are entirely memory based. We've recently developed a new type of security product which validate's server memory (using similar techniques to how Tripwire(see Bob's answer) validates files).
It's called BlockWatch, primarily designed for use in cloud/hypervisor/VM type deployments but can also validate physical memory if you can extract them.
For instance, you can use BlockWatch to verify your kernel and process address space code sections are what you expect (the legitimate files you installed to your disk).
Block incoming ports 135, 137, 138, 139, 445 with a firewall. The builtin one will do. Windows server 2008 is the first one for which using RDP directly is as secure as ssh.
There is previous little on the google on this subject other than people asking this very same question.
How would I get started writing my own firewall?
I'm looking to write one for the windows platform but I would also be interested in this information for other operating systems too.
For Windows 2000/XP there is an article with examples on CodeProject Developing Firewalls for Windows 2000/XPFor Vista I think you will need to use Windows Filtering Platform
This question is alarmingly similar to those asking how to write an encryption algorithm. The answers to both should end in gentle reminders about industry standard solutions that already:
embody years of experience and constant improvement,
are probably far more secure than any home-grown solution, and
account for ancillary requirements, such as efficiency.
A firewall must inspect every packet efficiently and accurately, and it therefore runs within the OS kernel or network stacks. Errors or inefficiencies jeopardize the security and performance of the entire machine and those downstream.
Building your own low-level firewall is an excellent exercise that will provide an education across many technologies. But for any real application, it's much safer and smarter to build a shell around the existing firewall API. Under Windows, the netsh command will do this; Linux uses netfilter and iptables. Googling any of these will point you to lots of theory, examples, and other helpful information.
So, to get started, I'd brush up on TCP/IP (specifically, the header information: ports and protocols), then learn about the various types of attacks and how to detect them. Learn about each operating system of interest and how it interacts with the network stacks. Finally, think about administration and logging: how will you configure your firewall and trace packets through it to ensure it's doing what you want it to do?
Good luck!
The usual approach is to use API hooking. Google can teach you that. Just hook all important networking stuff, like connect's and listens's, and refuse what you want.