OM Security Level Can Be Set for Template with Managed Code in .NET

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OM Security Level Can Be Set for Template with Managed Code
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The code behind a template can be granted higher privileges than the form security level would otherwise allow This is accomplished by using the InfoPath Form Templates code group
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Table 112: Form and IE Security Level Impacts on OM Security Level Form Security Level IE Security Zone OM Security Level
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Restricted Domain Domain
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Anything but restricted sites Restricted sites Internet
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2, otherwise 0 0 2; with default cross-domain IE settings, accessing another form through the OM is denied 2, cross-domain is prompted Same as local intranet 2 3
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Local intranet Local machine zone (LMZ) Trusted sites Anything but restricted sites
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As you can see from Table 112, a domain trust form in the local intranet zone can access only level 2 of the OM on itself This means the form template can access OM that speci cally relates to the current form (ie, the form where the code is running) belonging to that template Accessing another currently opened form using the OM is denied In Part II, we ll explain in more detail what OM properties and methods are available in each security level Furthermore, custom ActiveX controls (marked unsafe for scripting) are disallowed in the local intranet zone If you try to instantiate the FileSystemObject, for example, an error will result This is discussed in more detail in 15 Finally, the bene t we ve all been waiting for: cross-domain data access InfoPath will prompt the user at the time the data access actually occurs For example, querying or submitting to a Web service will open the dialog shown in Figure 1110 Cross-domain security prompts will usually appear only once per user session, that is, the speci c duration that a form is being lled out Another security prompt may arise during
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11: Se curity and Deployment
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Figure 1110: Security prompt for cross-domain data access
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form lling if code behind the form template attempts to access another domain that hasn t already been prompted and approved This prompt, such as Figure 1110, lists every known server to which each of the form s data connections (not just the one currently attempting to run) may connect This prompt may reappear suddenly for other servers if form code accesses other domains
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Browser-enabled form templates running in the browser do not prompt the user before executing an off-box data connection This is because such a form template or its connection (through the use of a server-defined data connection file) is fully trusted Data connection files are discussed in s 14 and 17
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The beloved Internet zone is where we do most of our everyday Web surfing It s also the place that we least trust, besides the restricted sites zone Due to the public and unregulated nature of the Web, an evil hacker could run an InfoPath form on your computer quite easily The question isn t about whether a form from the Internet can run on your computer; it s about what an Internet-based form can do when it runs on your computer This follows the security concept of defense in depth, where one assumes that a malicious form will run on your computer and that any security mechanisms in place to prevent such a form from running can and will be inevitably circumvented We started the domain trust section stating that domain trust forms offer a big win over restricted forms because of enabled data access scenarios However, this isn t completely true Domain forms that live in the Internet zone are subjected to a very strict security level In fact, they are functionally equivalent in most ways to restricted forms As a result, the same rules for restricted forms apply to Internet zone domain forms Unsafe ActiveX custom controls and cross-domain data access are both explicitly disallowed by default IE settings, but these can be changed Similarly, OM security level 2 is granted for OM running against the current form This means only properties and methods classi ed as level 2 are allowed to be called by form code on the current running form itself The only capability an Internet domain form has over a restricted form is same-domain data access Say, for example, that a domain trust form is available at http://wwwmoiconsultingcom/ forms/brokerxsn The form can use data connections that connect anywhere on http://wwwmoiconsultingcom but cannot go elsewhere, such as other domains Unfortunately, there is no option to get more security clearance from an Internet zone form unless users add your form s access path to their trusted sites zone in IE The only other alternative is to step up to the full trust security level But deploying a full trust form isn t as simple as just ipping the switch to the Full Trust option shown earlier in Figure 111 Shortly, we ll look at the implications of creating a full trust form template
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