From 7963279fc2c3a8cfa6affb70307bac6fa669679c Mon Sep 17 00:00:00 2001 From: David Norman Date: Thu, 19 Apr 2018 19:01:48 -0400 Subject: Generate SHA256 signed certificates for WinRM (#36668) * Generate SHA256 signed certificates Vulnerability scanners are increasingly reporting SHA-1 signed certificates as a vulnerability on servers. Before this change, -ForceNewSSLCert generates a signature algorithm that openssl shows as sha1WthRSAEncryption for WinRM port 5986. After, this forces certificates to be signed with SHA256, which openssl shows sha256WithRSAEncryption. Some example SHA-1 deprecations include: - https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2017/4010323 - https://blog.mozilla.org/security/2014/09/23/phasing-out-certificates-with-sha-1-based-signature-algorithms/ Also note that RDP 3389 on Windows 2016 also defaults to a SHA256 certificate. The specifics were merged from a script mod I found at https://gallery.technet.microsoft.com/scriptcenter/PowerShell-script-to-7a0321b7 intended for Exchange. It also includes a mod to add an alternate DNS listing so the cert contains CN=HOSTNAME plus now also an alternative of the FQDN. I tested this change on Windows 2008R2, 2012R2, and 2016 Datacenter. * Keep WinRM cert key length at 4096. * Remove WinRM cert exportpolicy setting. --- examples/scripts/ConfigureRemotingForAnsible.ps1 | 34 +++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'examples') diff --git a/examples/scripts/ConfigureRemotingForAnsible.ps1 b/examples/scripts/ConfigureRemotingForAnsible.ps1 index f048219c5c..caf7d365f3 100644 --- a/examples/scripts/ConfigureRemotingForAnsible.ps1 +++ b/examples/scripts/ConfigureRemotingForAnsible.ps1 @@ -39,6 +39,7 @@ # Updated by Dag Wieërs # Updated by Jordan Borean # Updated by Erwan Quélin +# Updated by David Norman # # Version 1.0 - 2014-07-06 # Version 1.1 - 2014-11-11 @@ -48,6 +49,7 @@ # Version 1.5 - 2017-02-09 # Version 1.6 - 2017-04-18 # Version 1.7 - 2017-11-23 +# Version 1.8 - 2018-02-23 # Support -Verbose option [CmdletBinding()] @@ -90,11 +92,15 @@ Function New-LegacySelfSignedCert [int]$ValidDays = 1095 ) + $hostnonFQDN = $env:computerName + $hostFQDN = [System.Net.Dns]::GetHostByName(($env:computerName)).Hostname + $SignatureAlgorithm = "SHA256" + $name = New-Object -COM "X509Enrollment.CX500DistinguishedName.1" $name.Encode("CN=$SubjectName", 0) $key = New-Object -COM "X509Enrollment.CX509PrivateKey.1" - $key.ProviderName = "Microsoft RSA SChannel Cryptographic Provider" + $key.ProviderName = "Microsoft Enhanced RSA and AES Cryptographic Provider" $key.KeySpec = 1 $key.Length = 4096 $key.SecurityDescriptor = "D:PAI(A;;0xd01f01ff;;;SY)(A;;0xd01f01ff;;;BA)(A;;0x80120089;;;NS)" @@ -114,7 +120,33 @@ Function New-LegacySelfSignedCert $cert.Issuer = $cert.Subject $cert.NotBefore = (Get-Date).AddDays(-1) $cert.NotAfter = $cert.NotBefore.AddDays($ValidDays) + + $SigOID = New-Object -ComObject X509Enrollment.CObjectId + $SigOID.InitializeFromValue(([Security.Cryptography.Oid]$SignatureAlgorithm).Value) + + [string[]] $AlternativeName += $hostnonFQDN + $AlternativeName += $hostFQDN + $IAlternativeNames = New-Object -ComObject X509Enrollment.CAlternativeNames + + foreach ($AN in $AlternativeName) + { + $AltName = New-Object -ComObject X509Enrollment.CAlternativeName + $AltName.InitializeFromString(0x3,$AN) + $IAlternativeNames.Add($AltName) + } + + $SubjectAlternativeName = New-Object -ComObject X509Enrollment.CX509ExtensionAlternativeNames + $SubjectAlternativeName.InitializeEncode($IAlternativeNames) + + [String[]]$KeyUsage = ("DigitalSignature", "KeyEncipherment") + $KeyUsageObj = New-Object -ComObject X509Enrollment.CX509ExtensionKeyUsage + $KeyUsageObj.InitializeEncode([int][Security.Cryptography.X509Certificates.X509KeyUsageFlags]($KeyUsage)) + $KeyUsageObj.Critical = $true + + $cert.X509Extensions.Add($KeyUsageObj) $cert.X509Extensions.Add($ekuext) + $cert.SignatureInformation.HashAlgorithm = $SigOID + $CERT.X509Extensions.Add($SubjectAlternativeName) $cert.Encode() $enrollment = New-Object -COM "X509Enrollment.CX509Enrollment.1" -- cgit v1.2.1