Go를 사용하여 TCP 연결을 위한 SSL 인증서 구성

Go의 database/sql 패키지를 사용하여 SQL Server용 Cloud SQL에 대한 TCP 연결에 사용되는 SSL(보안 소켓 레이어) 인증서를 구성합니다.

코드 샘플

Go

SQL 서버용 Cloud SQL에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다. 자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.

package cloudsql

import (
	"database/sql"
	"fmt"
	"log"
	"os"
	"strings"

	_ "github.com/denisenkom/go-mssqldb"
)

// connectTCPSocket initializes a TCP connection pool for a Cloud SQL
// instance of SQL Server.
func connectTCPSocket() (*sql.DB, error) {
	mustGetenv := func(k string) string {
		v := os.Getenv(k)
		if v == "" {
			log.Fatalf("Fatal Error in connect_tcp.go: %s environment variable not set.\n", k)
		}
		return v
	}
	// Note: Saving credentials in environment variables is convenient, but not
	// secure - consider a more secure solution such as
	// Cloud Secret Manager (https://cloud.google.com/secret-manager) to help
	// keep secrets safe.
	var (
		dbUser    = mustGetenv("DB_USER")       // e.g. 'my-db-user'
		dbPwd     = mustGetenv("DB_PASS")       // e.g. 'my-db-password'
		dbTCPHost = mustGetenv("INSTANCE_HOST") // e.g. '127.0.0.1' ('172.17.0.1' if deployed to GAE Flex)
		dbPort    = mustGetenv("DB_PORT")       // e.g. '1433'
		dbName    = mustGetenv("DB_NAME")       // e.g. 'my-database'
	)

	dbURI := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%s;database=%s;",
		dbTCPHost, dbUser, dbPwd, dbPort, dbName)

	// (OPTIONAL) Configure SSL certificates
	// For deployments that connect directly to a Cloud SQL instance without
	// using the Cloud SQL Proxy, configuring SSL certificates will ensure the
	// connection is encrypted.
	if dbRootCert, ok := os.LookupEnv("DB_ROOT_CERT"); ok { // e.g., '/path/to/my/server-ca.pem'
		// Get connection host name to be matched with host name in SSL certificate.
		var instanceConnectionName = mustGetenv("INSTANCE_CONNECTION_NAME")
		// Expected format of INSTANCE_CONNECTION_NAME is project_id:region:instance_name
		hostNameParts := strings.Split(instanceConnectionName, ":")
		if len(hostNameParts) != 3 {
			log.Fatalf("Invalid format for INSTANCE_CONNECTION_NAME environment variable, got = %q", instanceConnectionName)
		}
		// Specify encrypted connection, host name and certificate.
		dbURI += fmt.Sprintf("encrypt=true;hostnameincertificate=%s:%s;certificate=%s;",
			hostNameParts[0], hostNameParts[2], dbRootCert)
	}

	// dbPool is the pool of database connections.
	dbPool, err := sql.Open("sqlserver", dbURI)
	if err != nil {
		return nil, fmt.Errorf("sql.Open: %w", err)
	}

	// ...

	return dbPool, nil
}

다음 단계

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