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76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"path"
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"syscall"
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"time"
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)
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const (
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systemdVaultdir = "/run/systemd-vaultd/secrets"
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)
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func updateSecrets(serviceName, target string) error {
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// get systemd service name from credentials directory
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stat, err := os.Stat(target)
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if err != nil {
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return fmt.Errorf("failed to stat target %s: %w", target, err)
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}
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// inherit the owner and group of the credentials directory
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uid := stat.Sys().(*syscall.Stat_t).Uid
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gid := stat.Sys().(*syscall.Stat_t).Gid
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jsonPath := path.Join(systemdVaultdir, fmt.Sprintf("%s.json", serviceName))
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var content []byte
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for i := 0; i < 10; i++ {
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content, err = os.ReadFile(jsonPath)
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if err != nil {
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if os.IsNotExist(err) {
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// wait for the file to be created
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fmt.Printf("waiting for %s to be created", jsonPath)
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time.Sleep(1 * time.Second)
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continue
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}
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return fmt.Errorf("failed to read vault json file %s: %w", serviceName, err)
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}
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break
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}
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var data map[string]interface{}
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if err := json.Unmarshal(content, &data); err != nil {
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return fmt.Errorf("failed to unmarshal json from %s: %w", jsonPath, err)
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}
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for key, value := range data {
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targetPath := path.Join(target, key)
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os.Chown(path.Dir(targetPath), int(uid), int(gid))
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if err != nil {
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return fmt.Errorf("failed to create directory %s: %w", path.Dir(targetPath), err)
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}
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os.WriteFile(targetPath, []byte(value.(string)), 0o400)
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os.Chown(targetPath, int(uid), int(gid))
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}
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return nil
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}
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func main() {
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if len(os.Args) != 2 {
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fmt.Println("Usage: systemd-vaultd-update-secrets <target>")
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os.Exit(1)
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}
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serviceName := os.Getenv("SYSTEMD_ACTIVATION_UNIT")
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if serviceName == "" {
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fmt.Println("SYSTEMD_ACTIVATION_UNIT not set")
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os.Exit(1)
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}
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target := os.Args[1]
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if err := updateSecrets(serviceName, target); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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