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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| /* | ||
| Copyright 2023 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 metrics | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/sha256" | ||
| "errors" | ||
| "io" | ||
| "os" | ||
|
|
||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
||
| type checksums struct { | ||
| cert []byte | ||
| key []byte | ||
| authCA []byte | ||
| } | ||
|
|
||
| func (ck checksums) IsValid() bool { | ||
| return len(ck.cert) > 0 && len(ck.key) > 0 && len(ck.authCA) > 0 | ||
| } | ||
|
|
||
| func (ck checksums) Equal(ck2 checksums) bool { | ||
| if !bytes.Equal(ck.cert, ck2.cert) { | ||
| klog.Infof("cert changed: %x -> %x", ck.cert, ck2.cert) | ||
| return false | ||
| } | ||
| if !bytes.Equal(ck.key, ck2.key) { | ||
| klog.Infof("key changed: %x -> %x", ck.key, ck2.key) | ||
| return false | ||
| } | ||
| if !bytes.Equal(ck.authCA, ck2.authCA) { | ||
| klog.Infof("auth CA changed: %x -> %x", ck.authCA, ck2.authCA) | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| func newChecksums() checksums { | ||
| return newChecksumsWithPaths(tlsCert, tlsKey, authCAFile) | ||
| } | ||
|
|
||
| func allFilesReady() bool { | ||
| return allFilesReadyWithPaths(tlsCert, tlsKey, authCAFile) | ||
| } | ||
|
|
||
| // newChecksumsWithPaths is meant for testing purposes | ||
| func newChecksumsWithPaths(tlsCertPath, tlsKeyPath, authCAFilePath string) checksums { | ||
| return checksums{ | ||
| cert: checksumFile(tlsCertPath), | ||
| key: checksumFile(tlsKeyPath), | ||
| authCA: checksumFile(authCAFilePath), | ||
| } | ||
| } | ||
|
|
||
| // allFilesReadyWithPaths is meant for testing purposes | ||
| func allFilesReadyWithPaths(tlsCertPath, tlsKeyPath, authCAFilePath string) bool { | ||
| type entrySpec struct { | ||
| path string | ||
| desc string | ||
| } | ||
|
|
||
| entries := []entrySpec{ | ||
| { | ||
| path: tlsCertPath, | ||
| desc: "TLS cert", | ||
| }, | ||
| { | ||
| path: tlsKeyPath, | ||
| desc: "TLS key", | ||
| }, | ||
| { | ||
| path: authCAFilePath, | ||
| desc: "auth CA", | ||
| }, | ||
| } | ||
|
|
||
| for _, entry := range entries { | ||
| ok, err := fileExistsAndNotEmpty(entry.path) | ||
| if err != nil { | ||
| klog.Warningf("error checking if changed %s file empty/exists: %v", entry.desc, err) | ||
| return false | ||
| } | ||
| if !ok { | ||
| klog.V(2).Infof("%s missing or empty, certificates will not be rotated", entry.desc) | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| return true | ||
| } | ||
|
|
||
| func checksumFile(fName string) []byte { | ||
| file, err := os.Open(fName) | ||
| if err != nil { | ||
| klog.Errorf("failed to open file %v for checksum: %v", fName, err) | ||
| return []byte{} | ||
| } | ||
| defer file.Close() | ||
|
|
||
| hash := sha256.New() | ||
|
|
||
| if _, err = io.Copy(hash, file); err != nil { | ||
| klog.Errorf("failed to compute checksum for file %v: %v", fName, err) | ||
| return []byte{} | ||
| } | ||
|
|
||
| return hash.Sum(nil) | ||
| } | ||
|
|
||
| func fileExistsAndNotEmpty(fName string) (bool, error) { | ||
| fi, err := os.Stat(fName) | ||
| if err != nil { | ||
| if errors.Is(err, os.ErrNotExist) { | ||
| return false, nil | ||
| } | ||
| return false, err | ||
| } | ||
| return (fi.Size() != 0), nil | ||
| } |
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