c# print barcode font Practice: Maximizing Security for Remoting in .NET framework

Generation Quick Response Code in .NET framework Practice: Maximizing Security for Remoting

Practice: Maximizing Security for Remoting
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Page 10-36
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Exercise
Draw QR Code JIS X 0510 In Visual C#
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1. Should Dave use Web services or remoting Why
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Dave should use remoting because both the client and server are based on the .NET Framework, and performance is important.
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2. If Dave uses remoting, should he use HttpChannel or TcpChannel Why
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HttpChannel is the better choice because Dave can use ASP .NET to provide security.
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Questions and Answers
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3. If Dave uses remoting, is security built in
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No, remoting has no built-in security.
4. How can Dave provide authentication for remoting
Dave can require authentication in IIS and ASP .NET, and then provide the user credentials within the remoting client.
5. How can Dave provide authorization for remoting
Dave can use ASP .NET s authorization capabilities to provide authorization, or he can add a physical file matching the remoting server s virtual name and restrict the ACL.
6. How can Dave provide encryption for remoting
Dave should host the remoting server in ASP .NET and configure IIS with an SSL certificate. Optionally, he can configure the server and client to use IPSec.
Lab: Designing an Architecture for a Distributed Application
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Exercise
1. How do you recommend Fourth Coffee enable the customer to communicate with your Web application Why
Fourth Coffee should use Web services because Web services, unlike remoting, are standardsbased and allow for communications between different platforms.
2. What technique will you recommend Fourth Coffee use to ensure an attacker does not connect to your Web service Why
Fourth Coffee should host the Web service in ASP .NET and use ASP .NET for authentication. This takes the burden of creating an authentication mechanism off the developers.
3. How will you ensure an attacker does not capture and analyze the traffic going to and from your Web service Why did you recommend that technique
Fourth Coffee should host the Web service in ASP .NET, install an SSL certificate, and require HTTPS to encrypt all traffic. This technique is simpler to create than building encryption into the Web service itself. Alternatively, IPSec would provide similar functionality without requiring the developers to write additional code.
4. Can the new application use the COM object to communicate with the database If so, what are the drawbacks
Yes, .NET Framework applications can call COM objects. However, COM objects are not restricted by CAS. Therefore, attackers have a greater opportunity to exploit a vulnerability in the COM object to compromise your server than if the component were rewritten using the .NET Framework.
Glossar y
access control list (ACL) A term most commonly used to refer to a discretionary access control list (DACL). Advanced Encryption Standard (AES) A synonym for Rijndael. See Rijndael.
application domain A logical container that allows multiple assemblies to run within a single process while preventing them from directly accessing another assembly s memory. assembly evidence Identification that an assembly presents that describes the assembly s identity, such as the hash, the publisher, or the strong name. AssemblyInfo A configuration file that contains security information about an assembly. Among other configuration items, the AssemblyInfo file contains an assembly s strong name information. asymmetric encryption A cryptography technique that uses separate private and public keys to encrypt and decrypt data. Also known as public-key encryption. authentication authorization resource. The process of identifying a user. The process of verifying that a user is allowed to access a requested
buffer overflow An attack in which the attacker submits user input that is longer than the application was designed to process. canonicalization form. The process of simplifying a path to its most simple, absolute
canonicalization attack An attack that takes advantage of special characters that the operating system uses to identify filenames. certification authority (CA) A service that generates certificates. CAs can be run by a public company such as VeriSign and issue certificates to paying customers, or CAs can be managed by an internal IT department by using a computer running Microsoft Windows Server 2003 and Certificate Services. cipher text Encrypted text generated by an encryption algorithm that cannot be converted to plain text without a secret key.
Glossary
code access security (CAS) A security system that allows administrators and developers to authorize applications, similar to the way they have always been able to authorize users. code group An authorization device that associates assemblies with permission sets.
collusion A method for preventing security abuses by requiring two or more trusted insiders to work together to bypass security measures. cross-site scripting An attack that exploits Web server applications to cause them to display malicious content to end users. Data Encryption Standard (DES) A symmetric encryption algorithm that uses relatively short key lengths that are vulnerable to cracking attacks. Data Protection Application Programming Interface (DPAPI) A library that encrypts and stores data for an individual user or an entire computer. declarative RBS demands Access restrictions that are declared as an attribute to a method and that instruct the runtime to perform an access check before running the method. defense-in-depth A technique for reducing the risk associated with potential vulnerabilities by providing multiple, redundant layers of protection. digital signature A value that can be appended to electronic data to prove that the data was created by someone who possesses a specific private key. discretionary access control list (DACL) An authorization restriction mechanism that identifies the users and groups that are assigned or denied access permissions on an object. encryption key A value that can be used to encrypt and decrypt data. When used with symmetric encryption, this is also known as a shared secret. entropy A value designed to make deciphering the secret more difficult.
evidence The way an assembly is identified, such as the location where the assembly is stored, a hash of the assembly s code, or the assembly s signature. exploits A successful attack that uses a vulnerability to expose private information, gain elevated privileges, or deny legitimate users of a service. Fully Qualified Domain Name (FQDN) The full domain name of a server, such as www.micr osoft.com. fully trusted An assembly that is exempt from CAS permission checks.
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