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CLR code running in the database must follow SQL Server authentication and authorization rules when accessing database objects such as tables and columns. In addition, database administrators should be able to control access to operating system resources, such as file and network access, to database code. This becomes important because managed programming languages
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Appendix B
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used by the CLR provide functions to access such resources. The system must provide a secure way for CLR code to access machine resources outside the database engine process. Code Access Security (CAS) is implemented in the CLR host through the use of assemblylevel attributes. These attributes are deployed to the database within the assembly. The attributes and their function are shown in Table B-1.
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Table B-1
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SAFE Execute Only Yes Yes No EXTERNAL_ACCESS Execute + External Access Yes Yes No UNSAFE Unrestricted No No Yes
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Permission Set Code Access Security Programming model restrictions Verifiability Ability to call native code
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SAFE is the most reliable and secure mode with associated restrictions in terms of the permitted programming model. SAFE assemblies are given enough permission to run, perform computations, and are granted access to the local database. SAFE assemblies need to be verifiably type safe and are not permitted to call unmanaged code. UNSAFE is for highly trusted code that can only be created by database administrators. This trusted code has no code access security restrictions, and it can call unmanaged (native) code. For additional information on SAFE and UNSAFE assemblies, visit http:// msdn2.microsoft.com/en-us/library/ms189524.aspx. EXTERNAL_ACCESS provides an intermediate security option; it permits code to access resources external to the database, but it still has the reliability guarantees of SAFE. SQL Server uses the host-level CAS policy layer to set up a host policy that grants one of the three sets of permissions based on the permission set stored in SQL Server catalogs. Managed code running inside the database always gets one of these code access permission sets. The CLR host loads assemblies belonging to the same owner in the same application domain. By virtue of a set of assemblies running in the same application domain, assemblies are able to discover each other at execution time using the Microsoft .NET Framework reflection application programming interfaces or other means, and they can call into them in late-bound fashion. Because such calls are occurring against assemblies belonging to the same owner, there are no SQL Server permissions checked for these calls. The placement scheme of assemblies in application domains is designed primarily to achieve scalability, security, and isolation goals; however, Microsoft has not guaranteed that this functionality will be present in future versions of SQL Server.
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SQL Server 2005 Architecture and Internals
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CLR Services
The CLR provides a number of services to help achieve the design goals of CLR integration with SQL Server, such as type safety verification, Application Domains, Code Access Security and Host Protection Attributes.
Type Safety Verification
Type-safe code is code that accesses memory structures only in well-defined ways. For example, given a valid object reference, type-safe code can only access objects exactly as they are defined, reducing memory access errors (or general protection faults). When assemblies are loaded in the CLR, prior to the MSIL being compiled using JIT compilation, the runtime performs a verification phase that examines code to determine its type safety.
Application Domains
The CLR supports the idea of application domains as zones of execution within the SQLOS process where managed code assemblies can be loaded and executed. The application domain boundary provides isolation between assemblies. The assemblies are completely isolated in terms of their ability to interact with one another. Application domains are also the mechanism for loading and unloading code. Code can be unloaded from memory only by unloading an entire application domain.
Code Access Security (CAS)
The CLR security system provides a way to control the kinds of operations managed code can perform by assigning permissions to code. Code access permissions are assigned based on the signature, or strong name of the code. The CLR offers a system-wide policy that can be set by the system administrator. This policy defines the permissions for any managed code running on the system. In addition, the CLR host provides additional security to specify additional restrictions on managed code. If a managed API in the .NET Framework exposes operations on resources that are protected by a code access permission, the API will demand that permission before accessing the resource. This demand causes the CLR security system to trigger a comprehensive check of every assembly in the chain. Only if the entire call chain has permission will access to the resource be granted.
Host Protection Attributes (HPAs)
The CLR provides a mechanism for interacting with managed APIs that are part of the .NET Framework and have certain attributes that might be of interest to a host of the CLR. For
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