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Sunday, 18 August 2013

Creating SSL certificates for Exchange 2010 Edge servers

I recently moved from an on-premise email security gateway to a cloud service. As such, I had to setup some new Exchange Edge roles and install SSL certificates on them to provide TLS encryption. As there is a limited GUI, all of this needs to be done via powershell. Here is a quick, high level overview of the steps taken.

Generate Cert Request
 $data = New-ExchangeCertificate -GenerateRequest -SubjectName "c=AU, o=IT Dept, cn=mail.mydomain.com.au" -PrivateKeyExportable $true  
 Set-Content -Path "c:\Temp\mailcert.req" -Value $Data  

Submit Request to CA
  • Common name should be the public name eg. 
    • mail.mydomain.com.au
  • Add in additional 'Subject Alternate Names' for the actual server names eg.
    • exchedge1.mydomain.com.au
    • exchedge2.mydomain.com.au

Complete Certificate Request
 Import-ExchangeCertificate -FileData ([Byte[]]$(Get-Content -Path c:\Temp\mail_mydomain_com_au.cer -Encoding Byte -ReadCount 0))  

Note the thumbprint that is shown when successfully imported.

Assign the certificate to SMTP service
 Get-ExchangeCertificate -Thumbprint ABCD12345ABCD12345ABCD12345ABCD12345ABCD | Enable-ExchangeCertificate -Services SMTP  

Update the intermediate Certs

  • Download and run the Digicert Certificate Utility (https://www.digicert.com/util/), on the edge server.
  • "Repair" the cert if it's showing any missing/misplaced intermediate certificates

Export the certificate (and repeat import on second server)
$file = Export-ExchangeCertificate -Thumbprint ABCD12345ABCD12345ABCD12345ABCD12345ABCD -BinaryEncoded:$true -Password (Get-Credential).password  
Set-Content -Path "c:\Temp\mailcert.pfx" -Value $file.FileData -Encoding Byte  
Import-ExchangeCertificate -FileData ([Byte[]]$(Get-Content -Path c:\Temp\mailcert.pfx -Encoding Byte -ReadCount 0)) -Password (Get-Credential).password  
Get-ExchangeCertificate -Thumbprint ABCD12345ABCD12345ABCD12345ABCD12345ABCD | Enable-ExchangeCertificate -Services SMTP  

Update intermediate cert via Digicert Certificate Utility as above
Complete a synchronisation cycle (on an internal Hub Transport server)
 Start-EdgeSynchronization  

 Cheers,
         (__)
         (oo)  ok
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  / |    ||
 *  /\---/\
    ^^   ^^


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