I have experience developing software and web applications and I have decided to do some freelance work on the side. Well, I met with my first client and they are requesting a relatively simple, custom system that (without being long winded) tracks client’s paperwork as it progresses through the business’s different manual processes. It is a small business that has about 10 employees, but all of the employees will interact with the client’s paperwork, therefore everyone would need access to the new system. When I say ‘track’ I literally mean that the employees will ‘check as complete’ on a simple page the increases a progress bar at different stages for the paperwork. Now I am %110 capable of coding the custom system that meets their needs, but I am unsure about how I should go about doing it.
The information that is being tracked in the new system and stored in the DB is confidential information that they are very protective of. My main question is how should I be developing this to be as secure as I can?
-They have their own server in house, so should I develop an application (VB and SQL) for the server and require employees to log on remotely to use it? Can more than one person access/use the application at a time?
-Or should I develop a web application (ASP.Net/VB and SQL) that is only accessible on their network to their employees? They plan to expand offices, could they set up a VPN to access the site?
I’m leaning towards a web application, but I have not done too much in term of security. Basically I’m looking for pros and cons for either option or any suggestions on what I should.
PS, stackoverflow is awesome! Long time user, first time poster!
If you want to develop using vb & sql you have to consider that:
You need to have real ip
Your system will communicate threw certain port and you have to handle the security measure for letting certain port opened in your server.
You should have good knowledge in network programming
If you want to develop using asp.net you have to consider that:
in case only office employees will use the system, you can develop against users in Active Directory and for outside users with username and password with SSL connection or vpn
for preventing more than one person access the file you can simply add column 'locked' in case file is being used.
Well im not a web fan (I suck) ive seen too many security issues go with it...i.e Lulzsec, but i do very much love VB apps.
So I would definetely recommend a VB app connected to a MSSQL database (coz it's easy to configure and havent seen any security exploits yet),my Chinese friend told me there is a way to access MySQL free databases.Now, allow remote access but make sure your Windows Firewall is also configured properly do look at all angles of security.
If I remember well there is an option in MSSQL to specify the IP addresses or is it MAC addresses that can access the DB so maybe input all of the 10 employees' IP addresses assuming they are static,if they are dynamic (DHCP) don't bother. And ask them to make the IP address of the server where you will host the DB on static.
If only 10 employees use the DB then limit the connections to 10. For now develop this when it comes to VPN you can make a Remote version of the App im sure that will come later right now focus on the basics. Also use Dotfuscator when you are publishing the app I heard it is very good.N also im suggesting the document/work order is received at the reception so that user will check in the document with specifics...if they are passing on the work order to the next user they should select the user and then THAT user may enter some sort of verification code unique to the user...im sure you can envision the rest from here. Now do I also get a cut from this?lol
I've been doing the same for years now, and I always take the website side, this days I go width ASP.NET MVC 4, it's easier, everything in their place and extremely easier to test and maintain.
The web application has a very big advantage to any standalone windows application, you deploy and upgrade only one application instead to maintain all the different versions once you start deploying windows apps, and they are harder to debug once you start to having different machines with different versions and so on...
so, Web or Win app = Web app, always!
All you need is a server that run IIS and set it up for using Active Directory (Visual Studio has that project already, simply create an ASP.NET MVC and choose the "intranet" template), it will set up everything for you, and all you need later is tweak the Active Directory connection string.
I also use a self-signed SSL to protect data between client and server, as I also make the apps available outside the office without VPN needed, as long as they login with their secure AD credentials.
And... audit everything into a secondary database, every action performed by a user since they login until they logout, every view, update or creating data witch .NET makes it simple if you create your Logging method to simple log messages and Stack messages on errors.
This will greatly benefit your employer and you when something goes wrong.
I would say to go with web application. Advantage using web application is, if they want to expand bussiness .. same can you do with you WebApp. But choose .Net over VB, going with latest techonology will help you resolve current challanges.
Related
My organisation (a small non-profit) currently has an internal production .NET system with SQL Server database. The customers (all local to our area) submit requests manually that our office staff then input into the system.
We are now gearing up towards online public access, so that the customers will be able to see the status of their existing requests online, and in future also be able to create new requests online. A new asp.net application will be developed for the same.
We are trying to decide whether to host this application on-site on our servers(with direct access to the existing database) or use an external hosting service provider.
Hosting externally would mean keeping a copy of Requests database on the hosting provider's server. What would be the recommended way to then keep the requests data synced real-time between the hosted database and our existing production database?
Trying to sync back and forth between two in-use databases will be a constant headache. The question that I would have to ask you is if you have the means to host the application on-site, why wouldn't you go that route?
If you have a good reason not to host on site but you do have some web infrastructure available to you, you may want to consider creating a web service which provides access to your database via a set of well-defined methods. Or, on the flip side, you could make the database hosted remotely with your website your production database and use a webservice to access it from your office system.
In either case, providing access to a single database will be much easier than trying to keep two different ones constantly and flawlessly in sync.
If a webservice is not practical (or you have concerns about availability) you may want to consider a queuing system for synchronization. Any change to the db (local or hosted) is also added to a messaging queue. Each side monitors the queue for changes that need to be made and then apply the changes. This would account for one of the databases not being available at any given time.
That being said, I agree with #LeviBotelho, syncing two db's is a nightmare and should probably be avoided if you can. If you must, you can also look into SQL Server replication.
Ultimately the data is the same, customer submitted data. Currently it is being entered by them through you, ultimately it will be entered directly by them, I see no need in having two different databases with the same data. The replication errors alone when they will pop-up (and they will), will be a headache for your team for nothing.
I am developing a flex 4.5 web based application and I need to make sure if the client chooses a certain level of security, each user can log only from an authorized computer.
So the question is how can I get some unique computer information? Anything like HDD serial number, CPU specifications, motherboard information, even the user that is logged into the Operating System can do.
So far the information on the web isn't giving me much hope that this can be achieved, but I had to ask.
Thanks in advance.
I suppose the only option available for web application is to create unique id from fields of flash.system.Capabilities class.
Other strategy which can be used is to generate unique UID in process of computer's authorization and then store it in local storage using SharedObject. Then web app tries to read authorization data from SharedObject on web app start. If there is no such data computer isn't authorized.
Richard is right. For security, unique identifying information is not available for applications running through Flash Player. You could write an Active X control (for IE) or a plugin (for Mozilla based browsers) to obtain additional information for your app if users (and their IT administrators) allow it. Information available will vary depending on the browser and operating system the user is running.
Adobe Air, on the other hand, allows access to additional network information including MAC address in the NetworkInfo class. Maybe it's worth considering an installed client app for users who require the additional security. Take a look at: http://www.adobe.com/devnet/air/flex/articles/retrieving_network_interfaces.html
This is not easy using a browser based Flex application, but there are some workarounds.
The browser based Flash Player can communicate with an AIR app on the desktop using localconnection. So, you could create an AIR app that utilizes NativeProcess to retrieve your machine specific information.
You could also use NativeProcess from a AIR app without using the browser at all.
A third option would be to install an application server on the client machine and have the browser based app communicate with the server to retrieve the client information.
I consider most of these options too difficult to be practical, but it depends on how important this feature is to you.
The Flash Player security sandbox will not let you read anything unique about the system on which the SWF is running, so I'm afraid this is not possible. The closest you will get is likely Capabilities.serverString along with maybe IP address, but the serverString property just lists all the capabilities of the client, which is obviously not a unique thing, and also might change from time to time for the same computer.
Warning: my knowledge of server-side scripting is limited to say the least.
This isn't a technical solution, but rather a different approach to your problem.
An alternative solution to would be to inspect the raw packet at the server in order to obtain data such as the IP and MAC address. Based on this the server can then deny or allow the login attempt.
I am used to working on embedded web servers running on micro controllers where C-based black magic is rather common, so I am not sure if this is possible or practical in a more traditional environment.
I'm developing a software system which receives information (which is saved to a database) and when any information is received (new insert in a specific table) an alert should be seen in the screen in the information center, so proper action can be taken.
I'm writing an application with ASPNET MVC, SQL Server 2008 Express, SQL Agent free for that version of SQL Server, Entity Framework 4, Visual Studio 2010, etc.
Right now, I've set the database and a SQL job that monitors the table each minute, if there is a new records an email is sent to same addresses. My problem is...What then? Which would be the best architecture to follow?
A couple of option I thought about are:
1) In the job connect to a web service and that web service an the web service can open a popup
2) The web page could be pooling the database table to know if there are new records
Is there any way to make push to the web page instead of the page pooling the database server?
I know maybe windows application would fit better here, but right now I must stick with ASPNET MVC as I already started and don't want to create another application.
Thanks! Daniel
Is there any way to make push to the web page instead of the page pooling the database server?
HTML5 WebSockets. Draft, pretty new, specification is still subject to change, to all browsers implement it. You will need a WebSocket Server. If you go that route make sure you read this guy's blog. He is behind Laharsub which is a must try server.
I'm pretty sure you are able to use Silverlight to push data down to the client. Here is a pretty good overview that I read a while back. HTML5 might be a better way to go. But with such limited support it's almost not worth it at this point. Granted the Silverlight application might be out of reach to, but it's still a possibility.
I would suggest that you look into (complex) event processing, or stream processing -- at least to get the feeling for architecture of these systems.
The idea is to capture a stream of events before they reach database, route them (process) within the event processor and put them in the DB from there -- treating the DB as only one of event destinations (subscribers).
Take a look at Streambase, ruleCore, and many others.
These were all developed for the type of scenario you described.
Try to see the problem from the other angle. Develop a web client that reads the database every minute and compare to last pull ...
So I'm making a app for a bank, but it doesnt manage very important data. I have two problems, it will run over a VERY large LAN network protected by all kinds of security(antivirus and firewalls) and the bandwidth in certain regions is as low as 56kbps.(Its a desktop app with a web server backend connected by web services)
From the security point of view all I want is to prevent someone from executing the web services from some other source or app results in change in the database . I'm thinking of each desktop app installed with a install code, this will be hashed and required as a parameter for every function call and will act as an authentication ticket? Is this good enough? Are they better SIMPLER means?
For performance, how do I measure or know if the web service will send and receive data at a decent rate?
Thanks
Gideon
Assuming you are on a windows domain. You could configure the server to use windows authentication and restrict the users which can access the web service.
For performance measuring - asp.net will show you a sample request and response if you hit the web service from a browser, you can work out the site of a message and use the bandwidth to calculate how long it should take. You could also call the web service and use the stopwatch class to measure the time it takes.
I would prefer assigning usernames and passwords. Either way, the user can disclose their code to someone else. And either the user or a recipient can access the app using other programs (there's no way to prevent someone extracting an install code). But if you assign usernames, they are more likely to take personal responsibility for what happens using the authorization.
My company has a website product (ASP.NET) which is sold to customers. It means we don't host the website. They install it on their server and run it in the intranet.
I need to implement some sort of copy protection mechanism so that not everyone ends up installing the website. It has following aspects:
It has to be completely software based (no dongles).
Hiding usage information in registry or some folder in c:\ (basically outside virtual directory) is not an option for a website
Please can you suggest any scheme/method?
One suggestion is to use some kind of web service running, of course you need to have a main server to do so. In this server you can have some of your clients servers data (IP of the authorized servers, CPU and Motherboard ID's, and other important data).
This web service has to run some important logic of the program and return a value to the authorized servers. If the data of autorization sent by the client doesn't match, the server do will not execute the routine.
Of course I assume that this side of the logic is included in a DLL in the application and not in plain code.
A technique that worked well for a buddy of mine was to install a web bug on an administrative page which would report back to their server. You can monitor when and where the application is installed. It could be easily removed, but won't by most customers.
Simple, easy to do, and works relatively well.
Something you could try. Compile binaries for each client, obfuscate the code, lock the site down to a single domain. If its an internal app the domain might be something like "productname.clientname.internal". The app checks the domain of all the incoming requests, refuses anything that doesn't match.
As already pointed out by jeffamaphone: people will find ways around it, but it's enough to 'slow down' those not super determined.
[disclaimer]I sell the product I am recommending.[/disclaimer]
Take a look at DeployLX. You can add licensing to your web based application to require one of a couple different options.
Hardware based locking so it can only be used on one machine.
Domain based locking so it's tied to a specific domain name.
IP based locking to tie it to an IP address.
License server locking to that your app checks in periodically with a centralized web service.
It's pretty flexible and should let you create a balance between protection and not frustrating your users.