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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,213 @@ | ||
| /* | ||
| Copyright 2020 The Kubernetes Authors. | ||
| 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 | ||
| http://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. | ||
| */ | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "context" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
| "path/filepath" | ||
| "time" | ||
|
|
||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/credentials" | ||
| "google.golang.org/grpc/credentials/insecure" | ||
| log "k8s.io/klog/v2" | ||
| "sigs.k8s.io/apiserver-network-proxy/konnectivity-client/pkg/client" | ||
| ) | ||
|
|
||
| type GrpcProxyClientOptions struct { | ||
| Mode string | ||
| ClientCert string | ||
| ClientKey string | ||
| CACert string | ||
| ProxyUDSName string | ||
| ProxyHost string | ||
| ProxyPort int | ||
| } | ||
|
|
||
| type proxyFunc func(ctx context.Context, addr string) (net.Conn, error) | ||
|
|
||
| func getKonnectivityUDSDialer(ctx context.Context, address string, timeout time.Duration, o GrpcProxyClientOptions) (func(ctx context.Context, addr string) (net.Conn, error), error) { | ||
| log.Infof("using konnectivity UDS dialer") | ||
|
|
||
| var proxyConn net.Conn | ||
| var userAgent = "csi-open-local" | ||
| var err error | ||
|
|
||
| switch o.Mode { | ||
| case "grpc": | ||
| dialOption := grpc.WithContextDialer(func(context.Context, string) (net.Conn, error) { | ||
| c, err := net.DialTimeout("unix", o.ProxyUDSName, timeout) | ||
| if err != nil { | ||
| log.ErrorS(err, "failed to create connection to uds", "name", o.ProxyUDSName) | ||
| } | ||
| return c, err | ||
| }) | ||
| tunnel, err := client.CreateSingleUseGrpcTunnelWithContext( | ||
| context.TODO(), | ||
| ctx, | ||
| o.ProxyUDSName, | ||
| dialOption, | ||
| grpc.WithTransportCredentials(insecure.NewCredentials()), | ||
| grpc.WithUserAgent(userAgent), | ||
| ) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create tunnel %s, got %v", o.ProxyUDSName, err) | ||
| } | ||
|
|
||
| proxyConn, err = tunnel.DialContext(ctx, "tcp", address) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to dial request %s, got %v", address, err) | ||
| } | ||
| case "http-connect": | ||
| proxyConn, err = net.Dial("unix", o.ProxyUDSName) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("dialing proxy %q failed: %v", o.ProxyUDSName, err) | ||
| } | ||
| fmt.Fprintf(proxyConn, "CONNECT %s HTTP/1.1\r\nHost: %s\r\nUser-Agent: %s\r\n\r\n", address, "127.0.0.1", userAgent) | ||
| br := bufio.NewReader(proxyConn) | ||
| res, err := http.ReadResponse(br, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("reading HTTP response from CONNECT to %s via uds proxy %s failed: %v", | ||
| address, o.ProxyUDSName, err) | ||
| } | ||
| if res.StatusCode != 200 { | ||
| return nil, fmt.Errorf("proxy error from %s while dialing %s: %v", o.ProxyUDSName, address, res.Status) | ||
| } | ||
|
|
||
| // It's safe to discard the bufio.Reader here and return the | ||
| // original TCP conn directly because we only use this for | ||
| // TLS, and in TLS the client speaks first, so we know there's | ||
| // no unbuffered data. But we can double-check. | ||
| if br.Buffered() > 0 { | ||
| return nil, fmt.Errorf("unexpected %d bytes of buffered data from CONNECT uds proxy %q", | ||
| br.Buffered(), o.ProxyUDSName) | ||
| } | ||
| default: | ||
| return nil, fmt.Errorf("failed to process mode %s", o.Mode) | ||
| } | ||
|
|
||
| return func(ctx context.Context, addr string) (net.Conn, error) { | ||
| return proxyConn, nil | ||
| }, nil | ||
| } | ||
|
|
||
| func getKonnectivityMTLSDialer(ctx context.Context, address string, _ time.Duration, o GrpcProxyClientOptions) (func(ctx context.Context, addr string) (net.Conn, error), error) { | ||
| log.Infof("using konnectivity mTLS dialer") | ||
|
|
||
| tlsConfig, err := getClientTLSConfig(o.CACert, o.ClientCert, o.ClientKey, o.ProxyHost, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var proxyConn net.Conn | ||
| switch o.Mode { | ||
| case "grpc": | ||
| transportCreds := credentials.NewTLS(tlsConfig) | ||
| dialOption := grpc.WithTransportCredentials(transportCreds) | ||
| serverAddress := fmt.Sprintf("%s:%d", o.ProxyHost, o.ProxyPort) | ||
| tunnel, err := client.CreateSingleUseGrpcTunnelWithContext(context.TODO(), ctx, serverAddress, dialOption) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create tunnel %s, got %v", serverAddress, err) | ||
| } | ||
|
|
||
| proxyConn, err = tunnel.DialContext(ctx, "tcp", address) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to dial request %s, got %v", address, err) | ||
| } | ||
| case "http-connect": | ||
| proxyAddress := fmt.Sprintf("%s:%d", o.ProxyHost, o.ProxyPort) | ||
| proxyConn, err = tls.Dial("tcp", proxyAddress, tlsConfig) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("dialing proxy %q failed: %v", proxyAddress, err) | ||
| } | ||
| fmt.Fprintf(proxyConn, "CONNECT %s HTTP/1.1\r\nHost: %s\r\n\r\n", address, "127.0.0.1") | ||
| br := bufio.NewReader(proxyConn) | ||
| res, err := http.ReadResponse(br, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("reading HTTP response from CONNECT to %s via proxy %s failed: %v", | ||
| address, proxyAddress, err) | ||
| } | ||
| if res.StatusCode != 200 { | ||
| return nil, fmt.Errorf("proxy error from %s while dialing %s: %v", proxyAddress, address, res.Status) | ||
| } | ||
|
|
||
| // It's safe to discard the bufio.Reader here and return the | ||
| // original TCP conn directly because we only use this for | ||
| // TLS, and in TLS the client speaks first, so we know there's | ||
| // no unbuffered data. But we can double-check. | ||
| if br.Buffered() > 0 { | ||
| return nil, fmt.Errorf("unexpected %d bytes of buffered data from CONNECT proxy %q", | ||
| br.Buffered(), proxyAddress) | ||
| } | ||
| default: | ||
| return nil, fmt.Errorf("failed to process mode %s", o.Mode) | ||
| } | ||
|
|
||
| return func(ctx context.Context, addr string) (net.Conn, error) { | ||
| return proxyConn, nil | ||
| }, nil | ||
| } | ||
|
|
||
| // getCACertPool loads CA certificates to pool | ||
| func getCACertPool(caFile string) (*x509.CertPool, error) { | ||
| certPool := x509.NewCertPool() | ||
| caCert, err := os.ReadFile(filepath.Clean(caFile)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to read CA cert %s: %v", caFile, err) | ||
| } | ||
| ok := certPool.AppendCertsFromPEM(caCert) | ||
| if !ok { | ||
| return nil, fmt.Errorf("failed to append CA cert to the cert pool") | ||
| } | ||
| return certPool, nil | ||
| } | ||
|
|
||
| // getClientTLSConfig returns tlsConfig based on x509 certs | ||
| func getClientTLSConfig(caFile, certFile, keyFile, serverName string, protos []string) (*tls.Config, error) { | ||
| certPool, err := getCACertPool(caFile) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| tlsConfig := &tls.Config{ | ||
| RootCAs: certPool, | ||
| MinVersion: tls.VersionTLS12, | ||
| } | ||
| if len(protos) != 0 { | ||
| tlsConfig.NextProtos = protos | ||
| } | ||
| if certFile == "" && keyFile == "" { | ||
| // return TLS config based on CA only | ||
| return tlsConfig, nil | ||
| } | ||
|
|
||
| cert, err := tls.LoadX509KeyPair(certFile, keyFile) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to load X509 key pair %s and %s: %v", certFile, keyFile, err) | ||
| } | ||
|
|
||
| tlsConfig.ServerName = serverName | ||
| tlsConfig.Certificates = []tls.Certificate{cert} | ||
| return tlsConfig, nil | ||
| } |
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