====== Paralelni rad ======

<WRAP round info>
**Složenost:** Srednja \\
**Trajanje:** Neograničeno (dok se Classic ne isključi) \\
**Rizik:** Nizak
</WRAP>

Istovremeni rad klasičnog i Post-Quantum PKI-a za maksimalnu kompatibilnost.

----

===== Arhitektura =====

<mermaid>
flowchart TB
    subgraph CLASSIC["🔐 KLASIČNI PKI"]
        CR[Classic Root-CA]
        CI[Classic Intermediate]
        CC[Classic certifikati]
    end

    subgraph HYBRID["🔄 HIBRIDNI PKI"]
        HR[Hybrid Root-CA]
        HI[Hybrid Intermediate]
        HC[Hybrid certifikati]
    end

    subgraph CLIENTS["👥 KLIJENTI"]
        OLD[Legacy klijenti]
        NEW[Moderni klijenti]
    end

    CR --> CI --> CC
    HR --> HI --> HC
    CC --> OLD
    HC --> NEW
    CC -.->|Fallback| NEW

    style CLASSIC fill:#ffebee
    style HYBRID fill:#e8f5e9
</mermaid>

----

===== Kada paralelni rad? =====

| Scenarij | Preporuka |
|----------|-----------|
| Legacy sustavi se ne mogu ažurirati | ✓ Paralelno |
| Postupna migracija tijekom godina | ✓ Paralelno |
| Regulatorni zahtjevi za povratnu kompatibilnost | ✓ Paralelno |
| Greenfield / Novi projekt | ✗ Direktno Hibridno |
| Svi klijenti se mogu ažurirati | ✗ Hibridna migracija |

----

===== Postavljanje =====

==== Struktura direktorija ====

<code>
/etc/pki/
├── classic/
│   ├── root-ca.pem
│   ├── intermediate-ca.pem
│   ├── intermediate-ca.key
│   ├── crl/
│   └── issued/
├── hybrid/
│   ├── root-ca.pem
│   ├── intermediate-ca.pem
│   ├── intermediate-ca.key
│   ├── crl/
│   └── issued/
└── scripts/
    ├── issue-classic.sh
    ├── issue-hybrid.sh
    └── issue-both.sh
</code>

==== Skripta za dvostruko izdavanje ====

<code bash>
#!/bin/bash
# /etc/pki/scripts/issue-both.sh
# Izdaje certifikat od OBA PKI-a

CSR_FILE="$1"
OUTPUT_PREFIX="$2"

if [ -z "$CSR_FILE" ] || [ -z "$OUTPUT_PREFIX" ]; then
    echo "Usage: $0 <csr-file> <output-prefix>"
    exit 1
fi

# Izdavanje klasičnog certifikata
echo "Izdavanje klasičnog certifikata..."
openssl ca -config /etc/pki/classic/openssl.cnf \
    -in "$CSR_FILE" \
    -out "${OUTPUT_PREFIX}-classic.pem" \
    -days 365 \
    -batch

# Izdavanje hibridnog certifikata
echo "Izdavanje hibridnog certifikata..."
/usr/local/bin/wvds-sign --mode hybrid \
    --ca /etc/pki/hybrid/intermediate-ca.pfx \
    --csr "$CSR_FILE" \
    --out "${OUTPUT_PREFIX}-hybrid.pem" \
    --days 365

echo "Gotovo:"
echo "  Klasično: ${OUTPUT_PREFIX}-classic.pem"
echo "  Hibridno: ${OUTPUT_PREFIX}-hybrid.pem"
</code>

----

===== Konfiguracija servera =====

==== Nginx: Dvostruki certifikat ====

<code nginx>
server {
    listen 443 ssl;
    server_name api.example.com;

    # Primarno: Hibridni certifikat
    ssl_certificate     /etc/ssl/certs/api-hybrid.pem;
    ssl_certificate_key /etc/ssl/private/api.key;

    # Fallback: Klasični certifikat (za stare klijente)
    # Napomena: Nginx podržava samo jedan certifikat po server bloku
    # Za pravi dual-mode: Zasebni server blokovi ili SNI
}

# Alternativa: Zasebni server za Legacy
server {
    listen 443 ssl;
    server_name api-legacy.example.com;

    ssl_certificate     /etc/ssl/certs/api-classic.pem;
    ssl_certificate_key /etc/ssl/private/api.key;
}
</code>

==== Apache: Dvostruki certifikat ====

<code apache>
<VirtualHost *:443>
    ServerName api.example.com

    # Moderni klijenti → Hibridno
    SSLCertificateFile    /etc/ssl/certs/api-hybrid.pem
    SSLCertificateKeyFile /etc/ssl/private/api.key
    SSLCertificateChainFile /etc/ssl/certs/hybrid-chain.pem
</VirtualHost>

<VirtualHost *:443>
    ServerName api-legacy.example.com

    # Legacy klijenti → Klasično
    SSLCertificateFile    /etc/ssl/certs/api-classic.pem
    SSLCertificateKeyFile /etc/ssl/private/api.key
    SSLCertificateChainFile /etc/ssl/certs/classic-chain.pem
</VirtualHost>
</code>

----

===== Upravljanje Trust Storeom =====

==== Klijenti s oba CA ====

<code bash>
# Trust Store s oba Root-CA
cat /etc/pki/classic/root-ca.pem /etc/pki/hybrid/root-ca.pem > /etc/ssl/certs/ca-bundle.pem

# Ili pojedinačno dodati
update-ca-trust extract
</code>

==== Windows Trust Store ====

<code powershell>
# Uvoz oba Root-CA
Import-Certificate -FilePath "classic-root.cer" -CertStoreLocation Cert:\LocalMachine\Root
Import-Certificate -FilePath "hybrid-root.cer" -CertStoreLocation Cert:\LocalMachine\Root
</code>

----

===== CRL/OCSP za oba PKI-a =====

<code bash>
# CRL Distribution Points
# Klasično: http://crl.example.com/classic/intermediate.crl
# Hibridno: http://crl.example.com/hybrid/intermediate.crl

# Nginx za distribuciju CRL-a
location /crl/classic/ {
    alias /etc/pki/classic/crl/;
    types { application/pkix-crl crl; }
}

location /crl/hybrid/ {
    alias /etc/pki/hybrid/crl/;
    types { application/pkix-crl crl; }
}
</code>

----

===== Monitoring =====

<code yaml>
# Prometheus: Nadzor oba PKI-a
scrape_configs:
  - job_name: 'pki-classic'
    static_configs:
      - targets: ['localhost:9793']
    params:
      path: ['/etc/pki/classic/issued/*.pem']
    relabel_configs:
      - target_label: pki
        replacement: 'classic'

  - job_name: 'pki-hybrid'
    static_configs:
      - targets: ['localhost:9793']
    params:
      path: ['/etc/pki/hybrid/issued/*.pem']
    relabel_configs:
      - target_label: pki
        replacement: 'hybrid'
</code>

**Metrike nadzorne ploče:**

| Metrika | Klasično | Hibridno |
|---------|----------|----------|
| Aktivni certifikati | ''count(x509{pki="classic"})'' | ''count(x509{pki="hybrid"})'' |
| Istek < 30d | ''count(...)'' | ''count(...)'' |
| CRL Next Update | ''crl_next_update{pki="classic"}'' | ''crl_next_update{pki="hybrid"}'' |

----

===== Praćenje migracije =====

<code bash>
#!/bin/bash
# migration-status.sh - Napredak migracije

echo "=== PKI Migration Status ==="

classic_count=$(find /etc/pki/classic/issued -name "*.pem" | wc -l)
hybrid_count=$(find /etc/pki/hybrid/issued -name "*.pem" | wc -l)
total=$((classic_count + hybrid_count))

if [ "$total" -gt 0 ]; then
    hybrid_percent=$((hybrid_count * 100 / total))
else
    hybrid_percent=0
fi

echo "Klasično: $classic_count"
echo "Hibridno: $hybrid_count"
echo "Ukupno:   $total"
echo "Migracija: $hybrid_percent%"

# Grafički prikaz
echo ""
echo -n "Napredak: ["
for i in $(seq 1 50); do
    if [ $i -le $((hybrid_percent / 2)) ]; then
        echo -n "█"
    else
        echo -n "░"
    fi
done
echo "] $hybrid_percent%"
</code>

----

===== Postupno ukidanje klasičnog =====

<mermaid>
flowchart LR
    subgraph ACTIVE["✅ AKTIVNO"]
        A1[Oba PKI-a aktivna]
    end

    subgraph TRANSITION["🔄 PRIJELAZ"]
        T1[Klasično: samo obnova]
        T2[Hibridno: novi certifikati]
    end

    subgraph SUNSET["🌅 SUNSET"]
        S1[Klasično: samo aktivni]
        S2[Nema novih Classic certifikata]
    end

    subgraph END["🛑 KRAJ"]
        E1[Klasično deaktivirano]
    end

    ACTIVE --> TRANSITION --> SUNSET --> END

    style ACTIVE fill:#e8f5e9
    style END fill:#ffebee
</mermaid>

**Vremenski okvir:**

| Faza | Akcija | Okidač |
|------|--------|--------|
| Aktivno | Oba PKI-a izdaju | Početak |
| Prijelaz | Classic samo obnova | 80% Hibridno |
| Sunset | Classic samo ističe | 95% Hibridno |
| Kraj | Classic-CA offline | Svi Classic istekli |

----

===== Kontrolna lista =====

| # | Točka provjere | ✓ |
|---|----------------|---|
| 1 | Oba PKI-a postavljena | ☐ |
| 2 | Dual-Issue skripte funkcioniraju | ☐ |
| 3 | Trust Storeovi sadrže oba CA | ☐ |
| 4 | CRL/OCSP dostupan za oba | ☐ |
| 5 | Monitoring aktivan za oba | ☐ |
| 6 | Praćenje migracije postavljeno | ☐ |
| 7 | Plan postupnog ukidanja dokumentiran | ☐ |

----

===== Povezana dokumentacija =====

  * [[.:classic-to-hybrid|Classic → Hybrid]] – Direktna migracija
  * [[.:rollback-strategie|Rollback strategija]] – Plan za nuždu
  * [[..:monitoring:start|Monitoring]] – Nadzor oba PKI-a

----

<< [[.:classic-to-hybrid|← Classic → Hybrid]] | [[.:rollback-strategie|→ Rollback strategija]] >>

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

{{tag>migracija paralelno dual-pki kompatibilnost operator}}