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mysql.go
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mysql.go
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package sqlauthproxy
import (
"context"
"crypto/tls"
"fmt"
"net"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/rds/auth"
"github.com/borderzero/border0-cli/internal/border0"
"github.com/borderzero/border0-cli/internal/util"
"github.com/go-mysql-org/go-mysql/client"
"github.com/go-mysql-org/go-mysql/mysql"
"github.com/go-mysql-org/go-mysql/server"
"go.uber.org/zap"
"k8s.io/client-go/util/cert"
pe "github.com/pingcap/errors"
)
const (
serverVersion = "5.7.0"
)
type mysqlServerHandler interface {
server.Handler
Database() string
HandleConnection(serverConn *server.Conn, clientConn *client.Conn)
}
type mysqlHandler struct {
Config
logger *zap.Logger
options []func(*client.Conn)
awsCredentials aws.CredentialsProvider
server *server.Server
upstreamAddress string
}
type dummyProvider struct{}
func (p *dummyProvider) CheckUsername(username string) (found bool, err error) {
return true, nil
}
func (p *dummyProvider) GetCredential(username string) (password string, found bool, err error) {
return "", true, nil
}
func newMysqlHandler(c Config) (*mysqlHandler, error) {
upstreamAddress := net.JoinHostPort(c.Hostname, fmt.Sprintf("%d", c.Port))
var options []func(*client.Conn)
var awsCredentials aws.CredentialsProvider
if c.RdsIam {
cfg, err := util.GetAwsConfig(context.Background(), c.AwsRegion, c.AwsCredentials)
if err != nil {
return nil, fmt.Errorf("failed to initialize AWS client: %v", err)
}
awsCredentials = cfg.Credentials
}
if c.UpstreamTLS && c.DialerFunc == nil {
tlsConfig := &tls.Config{}
if len(c.UpstreamCABlock) > 0 {
caPool, err := cert.NewPoolFromBytes(c.UpstreamCABlock)
if err != nil {
return nil, fmt.Errorf("failed to load upstream CA: %s", err)
}
tlsConfig.RootCAs = caPool
tlsConfig.ServerName = c.Hostname
} else if c.UpstreamCAFile != "" {
caPool, err := cert.NewPool(c.UpstreamCAFile)
if err != nil {
return nil, fmt.Errorf("failed to load upstream CA: %s", err)
}
tlsConfig.RootCAs = caPool
tlsConfig.ServerName = c.Hostname
} else {
tlsConfig.InsecureSkipVerify = true
}
if len(c.UpstreamCertBlock) > 0 && len(c.UpstreamKeyBlock) > 0 {
cert, err := tls.X509KeyPair(c.UpstreamCertBlock, c.UpstreamKeyBlock)
if err != nil {
return nil, fmt.Errorf("failed to load upstream cert: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
} else if c.UpstreamCertFile != "" && c.UpstreamKeyFile != "" {
cert, err := tls.LoadX509KeyPair(c.UpstreamCertFile, c.UpstreamKeyFile)
if err != nil {
return nil, fmt.Errorf("failed to load upstream cert: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
} else if c.UpstreamCertFile != "" || c.UpstreamKeyFile != "" {
return nil, fmt.Errorf("upstream cert and key must both be provided")
}
options = append(options, func(c *client.Conn) { c.SetTLSConfig(tlsConfig) })
}
var mysqlServer *server.Server
if c.E2eEncryptionEnabled {
mysqlServer = server.NewServer(serverVersion, mysql.DEFAULT_COLLATION_ID, mysql.AUTH_NATIVE_PASSWORD, nil, nil)
} else {
mysqlServer = server.NewDefaultServer()
}
mysqlHandler := &mysqlHandler{
Config: c,
logger: c.Logger,
server: mysqlServer,
upstreamAddress: upstreamAddress,
awsCredentials: awsCredentials,
options: options,
}
return mysqlHandler, nil
}
func (h mysqlHandler) handleClient(c net.Conn) {
defer c.Close()
password := h.Password
if h.RdsIam {
authenticationToken, err := auth.BuildAuthToken(context.TODO(), h.upstreamAddress, h.AwsRegion, h.Username, h.awsCredentials)
if err != nil {
h.logger.Error("failed to create authentication token", zap.Error(err))
return
}
password = authenticationToken
}
if h.DialerFunc == nil {
h.DialerFunc = func(ctx context.Context, network, addr string) (net.Conn, error) {
return net.DialTimeout(network, addr, 5*time.Second)
}
}
clientConn, err := client.ConnectWithDialer(context.Background(), "tcp", h.upstreamAddress, h.Username, password, "", h.DialerFunc, h.options...)
if err != nil {
h.logger.Error("upstream mysql connection failed:", zap.Error(pe.Unwrap(err)))
return
}
defer func() {
if clientConn != nil {
clientConn.Close()
}
}()
var serverHandler mysqlServerHandler
if h.Config.E2eEncryptionEnabled {
e2EEncryptionConn, ok := c.(border0.E2EEncryptionConn)
if !ok {
c.Close()
h.logger.Error("failed to cast connection to e2eencryption")
return
}
if e2EEncryptionConn.Metadata == nil {
h.logger.Error("invalid e2e metadata")
return
}
serverHandler = &mysqlLocalHandler{
logger: h.logger.With(zap.String("session_key", e2EEncryptionConn.Metadata.SessionKey)),
metadata: e2EEncryptionConn.Metadata,
statements: make(map[int64]*client.Stmt),
preparedQueries: make(map[int64]string),
border0API: h.Border0API,
socket: h.Socket,
lastAuth: time.Now(),
recordingChan: make(chan message, 100),
clientConn: clientConn,
}
} else {
serverHandler = &mysqlEmptyHandler{
logger: h.logger,
clientConn: clientConn,
}
}
serverConn, err := server.NewCustomizedConn(c, h.server, &dummyProvider{}, serverHandler)
if err != nil {
h.Logger.Error("failed to accept connection", zap.Error(pe.Unwrap(err)))
return
}
defer func() {
if serverConn != nil && !serverConn.Closed() {
serverConn.Close()
}
}()
serverHandler.HandleConnection(serverConn, clientConn)
}