go.etcd.io/etcd@v3.3.27+incompatible/pkg/transport/tls.go (about) 1 // Copyright 2016 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package transport 16 17 import ( 18 "fmt" 19 "strings" 20 "time" 21 ) 22 23 // ValidateSecureEndpoints scans the given endpoints against tls info, returning only those 24 // endpoints that could be validated as secure. 25 func ValidateSecureEndpoints(tlsInfo TLSInfo, eps []string) ([]string, error) { 26 t, err := NewTransport(tlsInfo, 5*time.Second) 27 if err != nil { 28 return nil, err 29 } 30 var errs []string 31 var endpoints []string 32 for _, ep := range eps { 33 if !strings.HasPrefix(ep, "https://") { 34 errs = append(errs, fmt.Sprintf("%q is insecure", ep)) 35 continue 36 } 37 conn, cerr := t.Dial("tcp", ep[len("https://"):]) 38 if cerr != nil { 39 errs = append(errs, fmt.Sprintf("%q failed to dial (%v)", ep, cerr)) 40 continue 41 } 42 conn.Close() 43 endpoints = append(endpoints, ep) 44 } 45 if len(errs) != 0 { 46 err = fmt.Errorf("%s", strings.Join(errs, ",")) 47 } 48 return endpoints, err 49 }