### TLS with SNI Extension { #tls-with-sni-extension }

**Only one process** in the server can be listening on a specific **port** in a specific **IP address**. There could be other processes listening on other ports in the same IP address, but only one for each combination of IP address and port.

mountPath: {{ $casPath }} {{- end }} {{- end -}} {{/* Formats volume for Minio tls keys and trusted certs */}} {{- define "minio.tlsKeysVolume" -}} {{- if .Values.tls.enabled }} - name: cert-secret-volume secret: secretName: {{ .Values.tls.certSecret }} items: - key: {{ .Values.tls.publicCrt }} path: public.crt - key: {{ .Values.tls.privateKey }} path: private.key {{- end }} {{- if or .Values.tls.enabled (ne .Values.trustedCertsSecret "") }} {{- $certSecret := eq .Values.trustedCertsSecret "" | ternary ...

    * 上で述べたように、特定のIPとポートでリッスンできるプロセスは1つだけです。
    * これは、同じTLS Termination Proxyが証明書の更新処理も行う場合に非常に便利な理由の1つです。
    * そうでなければ、TLS Termination Proxyを一時的に停止し、証明書を取得するために更新プログラムを起動し、TLS Termination Proxyで証明書を設定し、TLS Termination Proxyを再起動しなければならないかもしれません。TLS Termination Proxyが停止している間はアプリが利用できなくなるため、これは理想的ではありません。


アプリを提供しながらこのような更新処理を行うことは、アプリケーション・サーバー（Uvicornなど）でTLS証明書を直接使用するのではなく、TLS Termination Proxyを使用して**HTTPSを処理する別のシステム**を用意したくなる主な理由の1つです。

mountPath: {{ $casPath }} {{- end }} {{- end -}} {{/* Formats volume for Minio tls keys and trusted certs */}} {{- define "minio.tlsKeysVolume" -}} {{- if .Values.tls.enabled }} - name: cert-secret-volume secret: secretName: {{ .Values.tls.certSecret }} items: - key: {{ .Values.tls.publicCrt }} path: public.crt - key: {{ .Values.tls.privateKey }} path: private.key {{- end }} {{- if or .Values.tls.enabled (ne .Values.trustedCertsSecret "") }} {{- $certSecret := eq .Values.trustedCertsSecret "" | ternary ...

import okhttp3.tls.internal.der.AlgorithmIdentifier
import okhttp3.tls.internal.der.AttributeTypeAndValue
import okhttp3.tls.internal.der.BasicConstraints
import okhttp3.tls.internal.der.BitString
import okhttp3.tls.internal.der.Certificate
import okhttp3.tls.internal.der.CertificateAdapters
import okhttp3.tls.internal.der.CertificateAdapters.generalNameDnsName

pkg crypto/tls, const QUICResumeSession = 8 #63691
pkg crypto/tls, const QUICResumeSession QUICEventKind #63691
pkg crypto/tls, const QUICStoreSession = 9 #63691
pkg crypto/tls, const QUICStoreSession QUICEventKind #63691
pkg crypto/tls, method (*ECHRejectionError) Error() string #63369
pkg crypto/tls, method (*QUICConn) StoreSession(*SessionState) error #63691

<img src="/img/deployment/https/https02.drawio.svg">

Diese Interaktion zwischen dem Client und dem Server zum Aufbau der TLS-Verbindung wird als **<abbr title="TLS-Handschlag">TLS-Handshake</abbr>** bezeichnet.

### TLS mit SNI-Erweiterung

    )
  }

  class Builder {
    internal var tls: Boolean = false
    internal var cipherSuites: Array<String>? = null
    internal var tlsVersions: Array<String>? = null
    internal var supportsTlsExtensions: Boolean = false

    internal constructor(tls: Boolean) {
      this.tls = tls
    }

    constructor(connectionSpec: ConnectionSpec) {
      this.tls = connectionSpec.isTls

Como apenas um único processo pode se comunicar com essa porta, o processo que faria isso seria o **Proxy de Terminação TLS**.

O Proxy de Terminação TLS teria acesso a um ou mais **certificados TLS** (certificados HTTPS).

Utilizando a **extensão SNI** discutida acima, o Proxy de Terminação TLS iria checar qual dos certificados TLS (HTTPS) disponíveis deve ser usado para essa conexão, utilizando o que corresponda ao domínio esperado pelo cliente.

pkg context, var DeadlineExceeded error
pkg crypto/tls, const RenegotiateFreelyAsClient = 2
pkg crypto/tls, const RenegotiateFreelyAsClient RenegotiationSupport
pkg crypto/tls, const RenegotiateNever = 0
pkg crypto/tls, const RenegotiateNever RenegotiationSupport
pkg crypto/tls, const RenegotiateOnceAsClient = 1
pkg crypto/tls, const RenegotiateOnceAsClient RenegotiationSupport
pkg crypto/tls, type Config struct, DynamicRecordSizingDisabled bool