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Why not? Your assembly must provide some other evidence that matches a code group providing full trust. It turns out that there are many types of evidence which you select when you modify a policy. Because the Visual Studio Tools for Office loader does not accept zone evidence, you must use something else. Another way to think about it might be that if you want to rent a video from the local video store and pay with cash, your video membership card is good enough.

But if you want to buy 20 DVDs and pay with a credit card, they require your driver's license. That's two types of evidence, each providing different levels of trust. The new group is a hierarchical group with two levels. The first level uses the full path to your assembly, excluding the assembly name.

The second code group uses the full path to your assembly including the assembly name as you see in Figure 2. Both code groups use the URL membership condition, allowing the code to run based on its location. The first level assigns the Execute permission set to the code group. The second level assigns the FullTrust permission set to the code group, which has a membership condition for the specific assembly you created when you compiled your project.

This adjustment to your runtime security policy allows you to press F5 and run the project without having to modify the CAS policies yourself. It satisfies the Visual Studio Tools for Office loader in that it provides additional evidence—in this case, URL evidence verifying that your assembly is trusted to be loaded into an Office host.

You might wonder why there is security at two levels within the file system. After all, if you were required to give the assembly FullTrust rights in order to run, why does the policy allow other code to run within the same directory? There are two reasons. The first is so that satellite assemblies that might, for example, contain resources such as localized string tables can be loaded.

Second, it lets you reference other assemblies within the same folder, so that they will at least load and execute. If the separate assemblies try to do anything that requires more than simple execution such as accessing a file and you haven't granted them permission via a code group, they will fail.

This would be a really, really bad idea. Imagine, for example, what would happen if you downloaded an assembly from a Web site that included some malicious code. There are many ways to trust code, and the mechanism you choose on your development computer is more for convenience than anything else. When deploying apps, however, you should do what's best for your users. This requires you to select evidence that's more secure, such as strong naming or X.

When using certificates or key files, it is a best practice to keep your release versions secure. When it's time to publish code, there should be some out-of-band process where only trusted members of your organization can sign code. For development, you have two options. The first is to define a development strong name key file that you use on your computer. If you have a team working on a project, you only need one key file.

The important point is that this key file is used to sign code only for testing and development. For release, you sign the code again using a different key file. The second option is to use delay signing. When an assembly is delay signed at build time, space is reserved in the portable executable PE file for the strong name signature, but the actual signing is deferred until some later stage.

You create key files using the. Continuing with the earlier example, open the Visual Studio. NET Command Prompt and change to a directory where you'd like to store the key file. You should note that all the switches used by the Strong Name utility are case sensitive. Before you go any further, you should back up your security settings. The user policy file is named security. You should always remember to back up these three files before you start modifying your security configuration.

Once the files are backed up, return to the. This will in turn delete the child code group for the assembly. Verify that you can no longer run or debug the solution. You should receive the same. NET security policy error message described earlier.

How can you run the application without the URL-based policy? You'll now add support for using a strong name as evidence for your assembly instead. Return to Visual Studio. NET and open the AssemblyInfo. Add the following AssemblyKeyFile attribute below the version number, so that when your assembly is compiled, it has a strong name:. We've included the C code for completeness. If you're creating a C solution, the AssemblyInfo.

Rebuild your solution and return to the. Generally speaking, you want to define your policies at the computer level. This lets you, as the local Administrator, set policy that can then be tested using a non-administrator account. Fill in the Description field, if you are so inclined, and click Next. Choosing the Strong Name option changes the page so that you can import the public key from your compiled assembly.

Click Import, and using the displayed file dialog, navigate to the subdirectory containing your signed assembly. Select it and click OK. Although you have the option on this page to trust any version of this specific assembly, or only a specific version, you want any code that is signed with your test key to be trusted, so click Next. On the Assign a Permission to the Code Group page, verify that FullTrust is selected in the Use existing permission set combobox and click Next and then Finish on the last page.

At this point, you should open your Excel document and verify that it opens without error. Because you've assigned a strong name to your assembly and have created a code access policy allowing any assembly using that strong name to run, you can now move projects anywhere on your local computer and not have to worry about these security issues.

If you create a new project, you need to sign it with the same key file used to create your policy. Naturally, you can have code groups representing different strong names. Here is one last development note: when you create new projects, you can select the Security Settings option and uncheck the option to update your local security policy, so that the wizard doesn't set up a URL-based policy allowing your project to run automatically see Figure 3.

You can add the AssemblyKeyFile attribute yourself, in that case. If you're working in a team environment, it's less painful if you all use the same key file, especially since you could create a simple script that uses CASPOL. EXE to configure these settings and then distribute this script to everyone on your team. You now know how to move code around your computer and share it with other developers, but what about your users?

How are they going to locate your application? There are three ways to deploy a solution created with Visual Studio Tools for Office:. All three options require changes to your user's local runtime security policy. In addition, if the host document is loaded directly from a network share, it must be explicitly trusted as well.

Finally, don't forget that deploying any solution created using Visual Studio Tools for Office requires that the following be installed on every computer:. Each deployment option has its own pros and cons. The choices for your solution and runtime security policy adjustments can range from distributing your application on floppy disk and installing it by hand on each individual client computer, to distributing batch files that invoke CASPOL. That said, your network administrators have to decide what works best for them.

Deploying the assembly on a shared location accessed either using file or HTTP protocols is a popular option. Once users have their security policies set up correctly, they can run Excel or Word documents and receive the latest version of the assembly without being aware that they're retrieving a new copy.

In addition, even mobile users can use this feature as long as they've run the solution at least once because the Visual Studio Tools for Office loader via the CLR copies the assembly to the offline assembly cache after it has been downloaded to the Internet Explorer cache. To work offline, the user must open Internet Explorer and indicate that he wants to work offline. If the user clears the Internet Explorer download cache, the solution will fail to load.

Modifying the user's runtime security policy so that the downloaded code runs is a little more complicated. Naturally, you should use a production strong name instead of a test version for your users, as we did earlier in this article.

In addition to giving the assembly a strong name, you might want to consider using an X. Although using strong names or X. In contrast, strong names are completely anonymous. It is only through out-of-band techniques that you would be able to verify that a strong name comes from a particular publisher.

Although you could allow code from any Internet location with your strong name or X. This reduces the possible attack surface for those with malicious intent. We named it msdn. Do the same thing on your computer but replace msdn. Use either your Publisher signature or your strong name for the membership condition and assign FullTrust as the permission set. In this example, we chose to update the Machine policy level. You can choose any of the three levels, whichever best suits your needs. If you choose to deploy both the assembly and document to the user's computer, you need to update their local policy.

The benefit of giving the user both the documents and assembly is that there are no online versus offline issues for the user to handle.

That said, if you need to deploy an updated version of your assembly, you must distribute the updated assembly to each user's computer. The last option has the user running both the host document and assembly from a network location. In order to run the assembly, you'll need to configure the user's runtime policy, as discussed previously. There's an additional step: running the Office document remotely requires that you install a special DLL msosec. Once this is done, create two custom code groups.

The parent is the location you want to trust using URL or Site evidence.