asp.net c# print barcode Default Security Levels in C#

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Default Security Levels
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Software restriction policies run on one of two default security levels:
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Unrestricted, which allows software to run with the full rights of the user who is logged on to the computer Disallowed, which does not allow the software to run, regardless of the access rights of the user who is logged on to the computer
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If the default level is set to Unrestricted, you can identify and create rules for the set of programs that you want to prohibit from running. If the default level is set to Disal lowed, you can identify and create rule exceptions for the programs that you trust to run. Either option can be set as the default security level for a GPO, but when a GPO is created, the default security level is Unrestricted.
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Setting the Default Security Level to Disallowed
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When you set the default security level to Disallowed, most software applications are restricted and you must apply a rule for nearly every application you want to run. Some applications must remain unrestricted for the operating system to function at all.
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Lesson 2
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Implementing Software Restriction Policies
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Four registry path rules are created automatically when you set the default security level to Disallowed:
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%HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ Systemroot% %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ Systemroot%\*.exe %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ Systemroot%\System32\*.exe %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ Programfilesdir%
These registry path rules are created as a safeguard against locking yourself and all users out of the system. Only advanced users should consider modifying or deleting these rules. If you decide to use a default security level of Disallowed, consider the following issues:
If a computer must run logon scripts, you must include a path rule that allows the scripts to run. For more information, refer to the Path Rule section in this lesson. Startup items are placed in HKEY_CURRENT_USER\Software\Microsoft\Windows\ CurrentVersion\Run. If startup items must run, you must create a rule for them. For more information, refer to the Path Rule section in this lesson. Many applications start other programs to perform certain tasks, and you must cre ate rules for these other programs. For example, Microsoft Word starts the Clip Organizer to manage clip art.
How Software Restriction Policies Work
When a user encounters an application to be run, software restriction policies must first identify the software. Software can be identified by its
Hash, a series of bytes with a fixed length that uniquely identify a program or file Certificate, a digital document used for authentication and secure exchange of information on open networks, such as the Internet, extranets, and intranets Path, a sequence of folder names that specifies the location of the software within the directory tree Internet zone, a subtree specified through Microsoft Internet Explorer: Internet, Intranet, Restricted Sites, Trusted Sites, or My Computer
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Administering Security with Group Policy
Rules
Software restriction policies identify and control the running of software by using rules. There are four types of rules, which correspond to the four ways of identifying software: a hash rule, a certificate rule, a path rule, and an Internet zone rule. These rules override the default security level. After software is identified by using a rule, you can decide whether or not to allow it to run by setting a security level (Disallowed or Unre stricted) for the program associated with the rule. Hash Rule A hash is a series of bytes with a fixed length that uniquely identify a program or file. The hash is computed by a hash algorithm. Software restriction policies can identify files by their hash, using both the SHA-1 (Secure Hash Algorithm) and the MD5 hash algorithm. For example, you can create a hash rule and set the security level to Disallowed to prevent users from running a certain file. A file can be renamed or moved to another folder and still result in the same hash. However, any change to the file changes its hash value and allows it to bypass restrictions. Software restriction pol icies recognize only hashes that have been calculated by using such policies. Certificate Rule A certificate rule identifies software by its signing certificate. For example, you can use certificate rules to automatically trust software from a trusted source in a domain without prompting the user. You can also use certificate rules to run files in disallowed areas of your operating system. Path Rule A path rule identifies software by its file path. For example, if you have a computer that has a disallowed default policy, you can still grant unrestricted access to a specific folder for each user. Simply create a path rule using the file path and set the security level of the path rule to Unrestricted. Some common paths for this type of rule are %Userprofile%, %Windir%, %Appdata%, %Programfiles%, and %Temp%. Because these rules are specified by path, if a program is moved, the path rule no longer applies. You can also create registry path rules that use the registry key of the software as the path. Internet Zone Rule Internet zone rules apply only to Windows Installer packages. A zone rule can identify software from a zone that is specified through Internet Explorer. These zones are Internet, Intranet, Restricted Sites, Trusted Sites, and My Computer.
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