/
connect_tcp.go
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/
connect_tcp.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START cloud_sql_mysql_databasesql_connect_tcp]
// [START cloud_sql_mysql_databasesql_connect_tcp_sslcerts]
// [START cloud_sql_mysql_databasesql_sslcerts]
package cloudsql
import (
"crypto/tls"
"crypto/x509"
"database/sql"
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"github.com/go-sql-driver/mysql"
)
// connectTCPSocket initializes a TCP connection pool for a Cloud SQL
// instance of MySQL.
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.", 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'
dbName = mustGetenv("DB_NAME") // e.g. 'my-database'
dbPort = mustGetenv("DB_PORT") // e.g. '3306'
dbTCPHost = mustGetenv("INSTANCE_HOST") // e.g. '127.0.0.1' ('172.17.0.1' if deployed to GAE Flex)
)
dbURI := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?parseTime=true",
dbUser, dbPwd, dbTCPHost, dbPort, dbName)
// [END cloud_sql_mysql_databasesql_connect_tcp]
// (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'
var (
dbCert = mustGetenv("DB_CERT") // e.g. '/path/to/my/client-cert.pem'
dbKey = mustGetenv("DB_KEY") // e.g. '/path/to/my/client-key.pem'
)
pool := x509.NewCertPool()
pem, err := ioutil.ReadFile(dbRootCert)
if err != nil {
return nil, err
}
if ok := pool.AppendCertsFromPEM(pem); !ok {
return nil, errors.New("unable to append root cert to pool")
}
cert, err := tls.LoadX509KeyPair(dbCert, dbKey)
if err != nil {
return nil, err
}
mysql.RegisterTLSConfig("cloudsql", &tls.Config{
RootCAs: pool,
Certificates: []tls.Certificate{cert},
InsecureSkipVerify: true,
VerifyPeerCertificate: verifyPeerCertFunc(pool),
})
dbURI += "&tls=cloudsql"
}
// [START cloud_sql_mysql_databasesql_connect_tcp]
// dbPool is the pool of database connections.
dbPool, err := sql.Open("mysql", dbURI)
if err != nil {
return nil, fmt.Errorf("sql.Open: %w", err)
}
// [START_EXCLUDE]
configureConnectionPool(dbPool)
// [END_EXCLUDE]
return dbPool, nil
}
// [END cloud_sql_mysql_databasesql_connect_tcp]
// verifyPeerCertFunc returns a function that verifies the peer certificate is
// in the cert pool.
func verifyPeerCertFunc(pool *x509.CertPool) func([][]byte, [][]*x509.Certificate) error {
return func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
if len(rawCerts) == 0 {
return errors.New("no certificates available to verify")
}
cert, err := x509.ParseCertificate(rawCerts[0])
if err != nil {
return err
}
opts := x509.VerifyOptions{Roots: pool}
if _, err = cert.Verify(opts); err != nil {
return err
}
return nil
}
}
// [END cloud_sql_mysql_databasesql_sslcerts]
// [END cloud_sql_mysql_databasesql_connect_tcp_sslcerts]