PHP의 SSL/TLS 양방향 인증 메커니즘에 대한 심층적인 이해

$sslConfig = array(
    "private_key_bits" => 2048,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
);
$sslContext = openssl_pkey_new($sslConfig);
openssl_pkey_export($sslContext, $privateKey);
$csr = openssl_csr_new(
    array(
        "commonName" => "example.com",
        "subjectAltName" => "www.example.com",
    ),
    $privateKey
);
openssl_csr_export($csr, $csrOut);
openssl_csr_sign($csr, null, $privateKey, 365);
openssl_x509_export($csr, $publicKey);

file_put_contents("server.key", $privateKey);
file_put_contents("server.csr", $csrOut);
file_put_contents("server.crt", $publicKey);

$sslConfig = array(
    "private_key_bits" => 2048,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
);
$sslContext = openssl_pkey_new($sslConfig);
openssl_pkey_export($sslContext, $privateKey);
$csr = openssl_csr_new(
    array(
        "commonName" => "client.example.com",
    ),
    $privateKey
);
openssl_csr_export($csr, $csrOut);
openssl_csr_sign($csr, null, $privateKey, 365);
openssl_x509_export($csr, $publicKey);

file_put_contents("client.key", $privateKey);
file_put_contents("client.csr", $csrOut);
file_put_contents("client.crt", $publicKey);

$sslOptions = array(
    "local_cert" => "server.crt",
    "local_pk" => "server.key",
);

$sslContext = stream_context_create(array(
    "ssl" => $sslOptions,
));

$server = stream_socket_server(
    "ssl://0.0.0.0:443",
    $errno,
    $errorMessage,
    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN,
    $sslContext
);

$sslOptions = array(
    "local_cert" => "client.crt",
    "local_pk" => "client.key",
);

$sslContext = stream_context_create(array(
    "ssl" => $sslOptions,
));

$client = stream_socket_client(
    "ssl://example.com:443",
    $errno,
    $errorMessage,
    30,
    STREAM_CLIENT_CONNECT,
    $sslContext
);

$peerCertificate = openssl_x509_parse(stream_context_get_params($client)["options"]["ssl"]["peer_certificate"]);

if ($peerCertificate["subject"]["CN"] === "client.example.com") {
    // 鉴权成功
} else {
    // 鉴权失败
}

$peerCertificate = openssl_x509_parse(stream_context_get_params($client)["options"]["ssl"]["peer_certificate"]);

if ($peerCertificate["subject"]["CN"] === "example.com") {
    // 鉴权成功
} else {
    // 鉴权失败
}