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Merge pull request #122 from endrec/gpg
Introduce encryption - GnuPG
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package backup | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/codeskyblue/go-sh" | ||
| "github.com/pkg/errors" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/stefanprodan/mgob/pkg/config" | ||
| "os" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| func encrypt(file string, encryptedFile string, plan config.Plan, conf *config.AppConfig) (string, error) { | ||
| if plan.Encryption.Gpg != nil { | ||
| if !conf.HasGpg { | ||
| return "", errors.Errorf("GPG configuration is present, but no GPG binary is found! Uploading unencrypted backup.") | ||
| } | ||
| return gpgEncrypt(file, encryptedFile, plan) | ||
| } | ||
|
|
||
| return "", errors.Errorf("Encryption config is not valid!") | ||
| } | ||
|
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| func removeUnencrypted(file string, encryptedFile string) { | ||
| // Check if encrypted file exists and remove original | ||
| stat, err := os.Stat(encryptedFile) | ||
| if err == nil && stat.Size() > 0 { | ||
| os.Remove(file) | ||
| } | ||
| } | ||
|
|
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| func gpgEncrypt(file string, encryptedFile string, plan config.Plan) (string, error) { | ||
| output := "" | ||
| recipient := "" | ||
|
|
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| recipients := plan.Encryption.Gpg.Recipients | ||
|
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| keyFile := plan.Encryption.Gpg.KeyFile | ||
| if keyFile != "" { | ||
| keyFileStat, err := os.Stat(keyFile) | ||
| if err == nil && !keyFileStat.IsDir() { | ||
| // import key from file | ||
| importCmd := fmt.Sprintf("gpg --batch --import %v", keyFile) | ||
|
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| result, err := sh.Command("/bin/sh", "-c", importCmd).CombinedOutput() | ||
| if len(result) > 0 { | ||
| output += strings.Replace(string(result), "\n", " ", -1) | ||
| } | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "Importing encryption key for plan %v failed %s", plan.Name, output) | ||
| } | ||
| if !strings.Contains(output, "imported: 1") && !strings.Contains(output, "unchanged: 1") { | ||
| return "", errors.Errorf("Importing encryption key failed %v", output) | ||
| } | ||
|
|
||
| re := regexp.MustCompile(`key ([0-9A-F]+):`) | ||
| keyMatch := re.FindStringSubmatch(output) | ||
| log.WithField("plan", plan.Name).Debugf("Import output: %v", output) | ||
| log.WithField("plan", plan.Name).Debugf("Parsed key id: %v", keyMatch[1]) | ||
| if keyMatch != nil { | ||
| recipients = append(recipients, keyMatch[1]) | ||
| } | ||
| } | ||
| } | ||
|
|
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| recipient = strings.Join(recipients, " -r ") | ||
|
|
||
| if recipient == "" { | ||
| return "", errors.Errorf("GPG configuration is present, but no encryption key is configured! %v", output) | ||
| } | ||
|
|
||
| keyServer := plan.Encryption.Gpg.KeyServer | ||
| if keyServer == "" { | ||
| keyServer = "hkps://keys.openpgp.org" | ||
| } | ||
|
|
||
| // encrypt file | ||
| encryptCmd := fmt.Sprintf( | ||
| "gpg -v --batch --yes --trust-model always --auto-key-locate local,%v -e -r %v -o %v %v", | ||
| keyServer, recipient, encryptedFile, file) | ||
|
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| result, err := sh.Command("/bin/sh", "-c", encryptCmd).CombinedOutput() | ||
| if len(result) > 0 { | ||
| output += strings.Replace(string(result), "\n", " ", -1) | ||
| } | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "Encryption for plan %v failed %s", plan.Name, output) | ||
| } | ||
|
|
||
| return output, nil | ||
| } |
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