Figure 12-1 Technologies in a distributed solution in .NET framework

Encoder QR Code JIS X 0510 in .NET framework Figure 12-1 Technologies in a distributed solution
Figure 12-1 Technologies in a distributed solution
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A different scenario arises when accessing the Enterprise Services application via a Web service as fa ade Here a Windows Forms client accesses the Web service using the SOAP protocol A different client of the Web service could be an ASPNET Web application that itself is accessed by a browser-based client Here the protocol HTTP or HTTPS is used The Web service itself accesses the serviced component using DCOM Now it is time to consider the security aspects of the following technologies: Windows security SQL Server Internet Information Server ASPNET Web applications ASPNET Web services Enterprise Services
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Windows Security
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The Windows operating system uses a challenge/response protocol to authenticate users Users have a username and a password, and they know their domain name With a challenge/response protocol, the password is never sent in clear text Instead, the security provider encodes a random block of data with the password and sends it to the caller (the challenge) The caller must decrypt the data with the
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password and send this data back to the security provider (the response) Windows enables you to restrict access to resources by using access control lists (ACLs) The access control list defines which users or user groups are allowed to access the resource in which way (for example, read, write, modify, create, delete)
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SQL Server
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SQL Server supports two different authentication modes: Windows authentication and Mixed Mode authentication With Windows authentication, you can use Windows accounts to define access to read/write/modify databases Mixed Mode authentication supports Windows accounts and SQL accounts SQL accounts can be configured directly in SQL Server Enterprise Manager Using Windows accounts with SQL Server has the advantage that the accounts have all the features of Windows accounts You can manage these accounts with the Users and Computers tool, you can configure the Windows privileges needed, the password can be configured with Windows administration tools, and access to these accounts is monitored with the Windows security event logging If you use SQL Server authentication instead of Windows authentication, the username and password must be set with the connection string, which can be a security leak You should never write the connection string directly to the code A connection string in the code would not allow administrator changes when the server changes; in addition, if the connection string contains username/password, it is possible to read this information from the assembly Instead, the connection string can be written to a configuration file or to the construction string of the serviced component A security issue still exists, however, because every user with read access to the configuration file knows the username and password to access the database With NET 11, you can avoid such a security leak by writing encrypted identity information to the registry, as shown in the note "Storing Secrets" later in this chapter
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Accounts and Connection Pools
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Sometimes end-user access checks must happen at the database level Although this is possible, you must be aware that connection pooling works only if the same connection string with the same user context is used If you use different Windows accounts that open connections, different connection pools for every user are used
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It is important that you remember another security aspect with regard to SQL Server: SQL injection attacks, which you can avoid by using parameter objects instead of using string concatenation when building the SQL commands Using stored procedures instead of accessing the tables and views directly makes a more granular access control possible Both of these issues are discussed in 6, "Data Access"
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