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Continuing my previous post I want to discuss about certificate installation. As you know, certificate erollment generally consist of several steps:
In previous post I have demonstrated how certificate request can be created using native PowerShell capabilities. While CA server cannot be contacted directly from managed client, you will have to manually transfer and submit certificate to Certification Authority.
When you create Certificate Request, it is placed in Certificate Enrollment Requests container (in Certificates snap-in). This request waits for signed certificate public part. When certificate public part is signed by external authority, signed certificate must be installed to local store. Installation process consist of two steps:
I would like to demonstrate a quite pretty script that simplifies certificate request generation for OpsMgr managed clients. Recently we had have to use various complex (for administrators that are not familiar with digital certificates) methods, such:
Both methods require some additional steps to generate request. For example, if you use CertReq.exe utility you need to write enough complex certificate enrollment configuration file. If you use Certificates snap-in you will need to manually specify all necesary data (such subject, private key settings, certificate extensions, etc). This PowerShell script will do all stuff, so you will have to copy and paste script to PowerShell console and run it.
In this article I want to talk about Applocker rule priority and rule sorting. As you know, Applocker has one security level or default action — Disallowed all except explicity allowed. This is common misunderstanding point for some administrators.
When you create Path or Publisher rule, it cannot uniquely identify particular file. For example, when you create Path rule such C:\BusinessPrograms\*, it will allow to run anything within C:\BusinessPrograms folder and all subfolders. Or, for example, you create Publisher rule that will allow to run any file that is signed with ‘Microsoft Corporation’ digital certificate, regardless of actual file location. It is common scenario when you want continue to block some files that are located in this folder or subfolders (in Path rule case) or files that are signed with particular certificate subject (in our case this is ‘Microsoft Corporation’ certificate), however.
This post is based on existing OpsMgr product group (PG) post: Troubleshooting Ops Mgr Certificate issues with Powershell. For me existing script return overloaded information to user and is not quite easy for understanding. Also there is missing some points:
Another point is that what we want to get from script? I thing that we just want to know:
This article describes process of obtaqining and installing a digital certificate for OpsMgr agent that is not a member of your AD forest or a trusted forest. This article assumes that your managed computer is running one of the following operating systems:
Target audience is OpsMgr administrators that have limited or no understanding of what certificates are and how PKI works. Described below is not the only way to achieve the same or similar goal but it implements many of PKI Best Practices.