Installation de l'autorité de certification racine
Je m'inspire de cette documentation, très complète : Offline Root CA Setup | docs.mjcb.io
Un livre papier/kindle existe, je le recommande très fortement.
J'utilise ici les bonnes pratiques de Microsoft qui consiste à mettre en place 2 serveurs :
- Un serveur Windows Server 2022 qui aura le rôle d'autorité de certification racine, qui sera par la suite éteint,
- Un deuxième serveur Windows Server 2022 qui aura le rôle d'autorité de certification intermédiaire, en ligne en permanence, qui délivrera les certificats clients.
On commence par mettre en place l'autorité de certification racine, qui sera par la suite offline.
A la racine du C:, on ajoute un fichier CAPolicy.inf :
[Version]
Signature = "$Windows NT$"
[PolicyStatementExtension]
Policies = AllIssuancePolicy,InternalPolicy
Critical = FALSE
; AllIssuancePolicy is set to the OID of 2.5.29.32.0 to ensure all certificate templates are available.
[AllIssuancePolicy]
OID = 2.5.29.32.0
[InternalPolicy]
OID = 1.2.3.4.1455.67.89.5
Notice = "The Khroners Labs Certification Authority is an internal resource. Certificates that are issued by this Certificate Authority are for internal usage only."
URL = http://pki.ad.khroners.fr/cps.html
[Certsrv_Server]
; Renewal information for the Root CA.
RenewalKeyLength = 4096
RenewalValidityPeriod = Years
RenewalValidityPeriodUnits = 10
; Disable support for issuing certificates with the RSASSA-PSS algorithm.
AlternateSignatureAlgorithm = 0
; The CRL publication period is the lifetime of the Root CA.
CRLPeriod = Years
CRLPeriodUnits = 10
; The option for Delta CRL is disabled since this is a Root CA.
CRLDeltaPeriod = Days
CRLDeltaPeriodUnits = 0
On configure le rôle :
certutil.exe -setreg CA\DSConfigDN "CN=Configuration,DC=ad,DC=khroners,DC=fr"
certutil.exe -setreg CA\ValidityPeriodUnits 5
certutil.exe -setreg CA\ValidityPeriod "Years"
certutil.exe -setreg CA\CRLPeriodUnits 52
certutil.exe -setreg CA\CRLPeriod "Weeks"
certutil.exe -setreg CA\CRLOverlapPeriodUnits 12
certutil.exe -setreg CA\CRLOverlapPeriod "Hours"
net stop CertSvc
net start CertSvc