====== 3.3 Operazioni ======

Attivita operative per l'infrastruttura crittografica PQ.

----

===== Health Check =====

Eseguire questi controlli regolarmente:

==== Check rapido (giornaliero) ====

<code bash>
# OpenSSL disponibile?
openssl version
# Atteso: OpenSSL 3.6.0 o superiore

# Algoritmi PQ attivi?
openssl list -signature-algorithms | grep -i "ml-dsa" | head -1
# Atteso: ML-DSA-44, ML-DSA-65, o ML-DSA-87
</code>

==== Health Check completo ====

**Linux/macOS:**
<code bash>
#!/bin/bash
echo "=== WvdS PQ Crypto Health Check ==="

# 1. OpenSSL
echo -n "OpenSSL: "
openssl version | grep -q "3\.[6-9]\|[4-9]\." && echo "OK" || echo "FAIL (Versione troppo vecchia)"

# 2. ML-DSA Support
echo -n "ML-DSA: "
openssl list -signature-algorithms 2>/dev/null | grep -qi "ml-dsa" && echo "OK" || echo "FAIL"

# 3. ML-KEM Support
echo -n "ML-KEM: "
openssl list -kem-algorithms 2>/dev/null | grep -qi "ml-kem" && echo "OK" || echo "FAIL"

# 4. Provider
echo -n "Provider: "
openssl list -providers | grep -q "default" && echo "OK" || echo "FAIL"

# 5. FIPS (opzionale)
echo -n "FIPS: "
openssl list -providers | grep -qi "fips" && echo "OK" || echo "Non configurato"

# 6. .NET Runtime
echo -n ".NET 8: "
dotnet --list-runtimes 2>/dev/null | grep -q "NETCore.App 8" && echo "OK" || echo "FAIL"

echo "=== Health Check completato ==="
</code>

**Windows (PowerShell):**
<code powershell>
Write-Host "=== WvdS PQ Crypto Health Check ===" -ForegroundColor Cyan

# 1. OpenSSL
$opensslVersion = & openssl version 2>$null
if ($opensslVersion -match "3\.[6-9]") {
    Write-Host "OpenSSL: OK ($opensslVersion)" -ForegroundColor Green
} else {
    Write-Host "OpenSSL: FAIL" -ForegroundColor Red
}

# 2. ML-DSA
$mldsa = & openssl list -signature-algorithms 2>$null | Select-String "ML-DSA"
if ($mldsa) {
    Write-Host "ML-DSA: OK" -ForegroundColor Green
} else {
    Write-Host "ML-DSA: FAIL" -ForegroundColor Red
}

# 3. ML-KEM
$mlkem = & openssl list -kem-algorithms 2>$null | Select-String "ML-KEM"
if ($mlkem) {
    Write-Host "ML-KEM: OK" -ForegroundColor Green
} else {
    Write-Host "ML-KEM: FAIL" -ForegroundColor Red
}

# 4. .NET
$dotnet = & dotnet --list-runtimes 2>$null | Select-String "NETCore.App 8"
if ($dotnet) {
    Write-Host ".NET 8: OK" -ForegroundColor Green
} else {
    Write-Host ".NET 8: FAIL" -ForegroundColor Red
}

Write-Host "=== Health Check completato ===" -ForegroundColor Cyan
</code>

----

===== Certificati via OpenSSL CLI =====

==== Creare Root CA ====

**Classico (RSA 4096):**
<code bash>
# 1. Generare chiave privata
openssl genpkey -algorithm RSA -out root-ca.key -pkeyopt rsa_keygen_bits:4096

# 2. Creare Root CA self-signed
openssl req -new -x509 -key root-ca.key -out root-ca.crt -days 3650 \
    -subj "/C=DE/O=Organizzazione/CN=Root CA"

# 3. Visualizzare certificato
openssl x509 -in root-ca.crt -text -noout
</code>

**Post-Quantum (ML-DSA-65):**
<code bash>
# 1. Generare chiave privata ML-DSA
openssl genpkey -algorithm ML-DSA-65 -out root-ca-pq.key

# 2. Creare PQ Root CA self-signed
openssl req -new -x509 -key root-ca-pq.key -out root-ca-pq.crt -days 3650 \
    -subj "/C=DE/O=Organizzazione/CN=PQ Root CA"

# 3. Visualizzare certificato
openssl x509 -in root-ca-pq.crt -text -noout
</code>

==== Creare Intermediate CA ====

<code bash>
# 1. Chiave privata per Intermediate
openssl genpkey -algorithm RSA -out intermediate.key -pkeyopt rsa_keygen_bits:4096

# 2. Creare CSR
openssl req -new -key intermediate.key -out intermediate.csr \
    -subj "/C=DE/O=Organizzazione/CN=Intermediate CA"

# 3. Firmare con Root CA (con estensioni CA)
openssl x509 -req -in intermediate.csr -CA root-ca.crt -CAkey root-ca.key \
    -CAcreateserial -out intermediate.crt -days 1825 \
    -extfile <(echo "basicConstraints=critical,CA:TRUE,pathlen:0
keyUsage=critical,keyCertSign,cRLSign")

# 4. Verificare catena
openssl verify -CAfile root-ca.crt intermediate.crt
</code>

==== Creare certificato End-Entity ====

<code bash>
# 1. Chiave privata
openssl genpkey -algorithm RSA -out server.key -pkeyopt rsa_keygen_bits:2048

# 2. CSR con SAN (Subject Alternative Name)
openssl req -new -key server.key -out server.csr \
    -subj "/C=DE/O=Organizzazione/CN=server.example.com" \
    -addext "subjectAltName=DNS:server.example.com,DNS:www.example.com"

# 3. Firmare con Intermediate
openssl x509 -req -in server.csr -CA intermediate.crt -CAkey intermediate.key \
    -CAcreateserial -out server.crt -days 365 \
    -extfile <(echo "basicConstraints=CA:FALSE
keyUsage=critical,digitalSignature,keyEncipherment
extendedKeyUsage=serverAuth,clientAuth
subjectAltName=DNS:server.example.com,DNS:www.example.com")

# 4. Verificare catena completa
openssl verify -CAfile root-ca.crt -untrusted intermediate.crt server.crt
</code>

==== Ispezionare certificato ====

<code bash>
# Mostrare dettagli certificato
openssl x509 -in cert.crt -text -noout

# Solo Subject e Issuer
openssl x509 -in cert.crt -subject -issuer -noout

# Periodo di validita
openssl x509 -in cert.crt -dates -noout

# Fingerprint
openssl x509 -in cert.crt -fingerprint -sha256 -noout

# Estrarre chiave pubblica
openssl x509 -in cert.crt -pubkey -noout

# Algoritmo di firma
openssl x509 -in cert.crt -text -noout | grep "Signature Algorithm"
</code>

==== Convertire formati certificato ====

<code bash>
# PEM a DER
openssl x509 -in cert.pem -outform DER -out cert.der

# DER a PEM
openssl x509 -in cert.der -inform DER -outform PEM -out cert.pem

# PEM a PKCS#12 (PFX)
openssl pkcs12 -export -out cert.pfx -inkey private.key -in cert.crt -certfile ca-chain.crt

# PKCS#12 a PEM (Certificato + Chiave)
openssl pkcs12 -in cert.pfx -out cert-and-key.pem -nodes
</code>

----

===== Gestione Trust Store =====

==== Windows Certificate Store ====

**Importare certificato CA (PowerShell come amministratore):**
<code powershell>
# Root CA in Trusted Root Certification Authorities
Import-Certificate -FilePath "root-ca.crt" -CertStoreLocation Cert:\LocalMachine\Root

# Intermediate CA in Intermediate Certification Authorities
Import-Certificate -FilePath "intermediate.crt" -CertStoreLocation Cert:\LocalMachine\CA

# Verificare
Get-ChildItem Cert:\LocalMachine\Root | Where-Object {$_.Subject -like "*Root CA*"}
</code>

**Elencare certificati:**
<code powershell>
# Tutte le Root CA
Get-ChildItem Cert:\LocalMachine\Root | Format-Table Subject, Thumbprint, NotAfter

# Certificati in scadenza (< 30 giorni)
Get-ChildItem Cert:\LocalMachine\Root | Where-Object {$_.NotAfter -lt (Get-Date).AddDays(30)} | Format-Table Subject, NotAfter
</code>

**Rimuovere certificato:**
<code powershell>
# Per Thumbprint
Get-ChildItem Cert:\LocalMachine\Root | Where-Object {$_.Thumbprint -eq "ABC123..."} | Remove-Item
</code>

==== Linux Trust Store ====

**Debian/Ubuntu:**
<code bash>
# Aggiungere certificato CA
sudo cp root-ca.crt /usr/local/share/ca-certificates/wvds-root-ca.crt
sudo update-ca-certificates

# Verificare
ls /etc/ssl/certs/ | grep wvds

# Rimuovere certificato
sudo rm /usr/local/share/ca-certificates/wvds-root-ca.crt
sudo update-ca-certificates --fresh
</code>

**RHEL/CentOS:**
<code bash>
# Aggiungere certificato CA
sudo cp root-ca.crt /etc/pki/ca-trust/source/anchors/wvds-root-ca.crt
sudo update-ca-trust

# Verificare
trust list | grep -A2 "WvdS"
</code>

==== macOS Keychain ====

<code bash>
# Aggiungere CA al System Keychain
sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain root-ca.crt

# Verificare
security find-certificate -a -c "Root CA" /Library/Keychains/System.keychain
</code>

----

===== Backup & Recovery =====

**Componenti da salvare:**

^  Componente  ^  Percorso  ^  Frequenza  ^  Priorita  ^
| Root CA Private Key | Storage offline | Dopo creazione | **Critico** |
| Intermediate CA Key | Server | Giornaliero | Alta |
| Storage chiavi PQ | ''%LOCALAPPDATA%\WvdS.Crypto\PqKeys\'' | Giornaliero | Alta |
| Certificati (PFX) | Directory applicazione | Dopo creazione | Media |

**Script di backup (Linux):**
<code bash>
#!/bin/bash
BACKUP_DIR="/backup/pq-crypto/$(date +%Y%m%d)"
mkdir -p "$BACKUP_DIR"

# Storage chiavi PQ
cp -r ~/.local/share/wvds-crypto/pqkeys/ "$BACKUP_DIR/"

# Certificati
cp /etc/ssl/certs/wvds-*.crt "$BACKUP_DIR/"

# Proteggere permessi
chmod 700 "$BACKUP_DIR"
chmod 600 "$BACKUP_DIR"/*

echo "Backup creato: $BACKUP_DIR"
</code>

<WRAP warning>
**Importante:** Lo storage chiavi PQ **non** e incluso nel backup del Windows Certificate Store!
</WRAP>

----

===== Monitoring =====

**Monitorare scadenza certificati:**
<code bash>
# Tutti i certificati con scadenza < 30 giorni
for cert in /etc/ssl/certs/*.crt; do
    expiry=$(openssl x509 -in "$cert" -enddate -noout 2>/dev/null | cut -d= -f2)
    if [ -n "$expiry" ]; then
        expiry_epoch=$(date -d "$expiry" +%s 2>/dev/null)
        now_epoch=$(date +%s)
        days_left=$(( (expiry_epoch - now_epoch) / 86400 ))
        if [ "$days_left" -lt 30 ]; then
            echo "ATTENZIONE: $cert scade tra $days_left giorni"
        fi
    fi
done
</code>

**Scadenze per rinnovo:**
^  Tipo certificato  ^  Rinnovo prima della scadenza  ^
| Root CA | 30 giorni |
| Intermediate CA | 14 giorni |
| End-Entity | 7 giorni |

----

===== Approfondimenti =====

  * [[.:troubleshooting|Troubleshooting]] – Risolvere problemi operativi
  * [[..:konzepte:sicherheit|Sicurezza]] – Best Practice
  * [[.:konfiguration|Configurazione]] – Attivare modalita FIPS

----
//Wolfgang van der Stille @ EMSR DATA d.o.o. - Post-Quantum Cryptography Professional//

{{tag>betrieb zertifikate backup trust-store health-check openssl}}