Separate self-signed CA and TLS certificate

eng/common/testproxy/.gitignore

@@ -0,0 +1,3 @@
+*.csr
+*.key
+*.srl

eng/common/testproxy/ca.conf

@@ -0,0 +1,17 @@
+# Configuration for the self-signed CA used to sign the localhost TLS certificate.
+# Parameters are kept in sync with the original dotnet-devcert.crt so that
+# dotnet dev-certs and other tooling recognises the certificate chain.
+
+[req]
+prompt                  = no
+default_bits            = 2048
+distinguished_name      = subject
+x509_extensions         = x509_ext
+
+[ subject ]
+commonName              = Azure SDK
+
+[x509_ext]
+basicConstraints        = critical, CA:true
+keyUsage                = critical, keyCertSign, cRLSign
+subjectKeyIdentifier    = hash

eng/common/testproxy/ca.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC+DCCAeCgAwIBAgIUQSfEYlZEwuRS9elscvH2orem7+YwDQYJKoZIhvcNAQEL
+BQAwFDESMBAGA1UEAwwJQXp1cmUgU0RLMB4XDTI2MDUwNjAzMjc0N1oXDTI3MDUw
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+-----END CERTIFICATE-----

eng/common/testproxy/dotnet-devcert.crt

@@ -1,21 +1,18 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

eng/common/testproxy/localhost.conf

@@ -1,3 +1,6 @@
+# TLS certificate configuration for the localhost leaf certificate.
+# This cert is signed by the self-signed CA defined in ca.conf.
+
 [req]
 prompt                  = no
 default_bits            = 2048
@@ -9,15 +12,14 @@ x509_extensions         = x509_ext
 commonName              = localhost
 
 [req_ext]
-basicConstraints        = critical, CA:true
+basicConstraints        = critical, CA:false
 subjectAltName          = @alt_names
 
 [x509_ext]
-basicConstraints        = critical, CA:true
-keyUsage                = critical, keyCertSign, cRLSign, digitalSignature,keyEncipherment
+keyUsage                = critical, digitalSignature, keyEncipherment
 extendedKeyUsage        = critical, serverAuth
 subjectAltName          = critical, @alt_names
-1.3.6.1.4.1.311.84.1.1  = ASN1:UTF8String:ASP.NET Core HTTPS development certificate # Needed to get it imported by dotnet dev-certs
+1.3.6.1.4.1.311.84.1.1 = ASN1:UTF8String:ASP.NET Core HTTPS development certificate # Needed to get it imported by dotnet dev-certs
 
 [alt_names]
 DNS.1                   = localhost

eng/common/testproxy/localhost.crt

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDdzCCAl+gAwIBAgIUdURcL17NeFzznnxY1Bcx5Jl4WYIwDQYJKoZIhvcNAQEL
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+gIp2IQgFBxDGSiQe0ZKmaf1QgW+Yl+u5E85E
+-----END CERTIFICATE-----

eng/common/testproxy/rotate.sh

@@ -0,0 +1,100 @@
+#!/usr/bin/env bash
+
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+# Generates a self-signed CA and a TLS certificate for localhost signed by that CA,
+# then packages them into a PKCS#12 (PFX) file for use with the test proxy.
+#
+# Usage: ./rotate.sh [--days <n>] [--password <pass>]
+#   --days      Validity period in days (default: 365)
+#   --password  Password for the PFX file (default: password, matching apply-dev-cert.sh)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+DAYS=365
+PFX_PASSWORD="password"
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --days)
+            DAYS="$2"
+            shift 2
+            ;;
+        --password)
+            PFX_PASSWORD="$2"
+            shift 2
+            ;;
+        *)
+            echo "Unknown argument: $1" >&2
+            exit 1
+            ;;
+    esac
+done
+
+CA_KEY="$SCRIPT_DIR/ca.key"
+# dotnet-devcert.crt is the CA public cert installed into trust stores by apply-dev-cert.sh.
+CA_CERT="$SCRIPT_DIR/dotnet-devcert.crt"
+CA_CONF="$SCRIPT_DIR/ca.conf"
+
+TLS_KEY="$SCRIPT_DIR/dotnet-devcert.key"
+TLS_CSR="$SCRIPT_DIR/dotnet-devcert.csr"
+TLS_CERT="$SCRIPT_DIR/localhost.crt"
+TLS_PFX="$SCRIPT_DIR/dotnet-devcert.pfx"
+TLS_CONF="$SCRIPT_DIR/localhost.conf"
+
+echo "Generating CA private key..."
+openssl genrsa -out "$CA_KEY" 2048
+
+echo "Generating self-signed CA certificate (${DAYS} days)..."
+openssl req -new -x509 \
+    -key "$CA_KEY" \
+    -out "$CA_CERT" \
+    -days "$DAYS" \
+    -config "$CA_CONF"
+
+echo "Generating TLS private key..."
+openssl genrsa -out "$TLS_KEY" 2048
+
+echo "Generating TLS certificate signing request..."
+openssl req -new \
+    -key "$TLS_KEY" \
+    -out "$TLS_CSR" \
+    -config "$TLS_CONF"
+
+echo "Signing TLS certificate with CA (${DAYS} days)..."
+openssl x509 -req \
+    -in "$TLS_CSR" \
+    -CA "$CA_CERT" \
+    -CAkey "$CA_KEY" \
+    -CAcreateserial \
+    -out "$TLS_CERT" \
+    -days "$DAYS" \
+    -extfile "$TLS_CONF" \
+    -extensions x509_ext
+
+echo "Creating PFX bundle (TLS cert + CA chain + private key)..."
+openssl pkcs12 -export \
+    -out "$TLS_PFX" \
+    -inkey "$TLS_KEY" \
+    -in "$TLS_CERT" \
+    -certfile "$CA_CERT" \
+    -password "pass:${PFX_PASSWORD}"
+
+# Remove OpenSSL serial number tracking file; it is regenerated on each run.
+rm -f "$SCRIPT_DIR/ca.srl"
+
+echo ""
+echo "Created files:"
+echo "  $CA_CERT  (CA public cert — install this into trust stores)"
+echo "  $TLS_CERT"
+echo "  $TLS_CSR"
+echo "  $TLS_PFX  (CA public cert + TLS public cert + TLS private key)"
+echo ""
+echo "Private keys (gitignored — do not commit):"
+echo "  $CA_KEY"
+echo "  $TLS_KEY"
+echo ""
+echo "Run apply-dev-cert.sh to install the certificates into your trust stores."