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package cert
import (
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
)
// InstallCA attempts to install the Shiv CA into the user-level trust store.
// Never requires sudo. Returns a human-readable status string, or an error
// with manual instructions if automatic installation is not possible.
func (ca *CA) InstallCA() (string, error) {
certPath, err := CertPEMPath()
if err != nil {
return "", err
}
switch runtime.GOOS {
case "linux":
return installLinux(certPath)
case "darwin":
return installDarwin(certPath)
case "windows":
return installWindows(certPath)
default:
return "", manualInstructions(certPath, fmt.Sprintf("unsupported OS: %s", runtime.GOOS))
}
}
func installLinux(certPath string) (string, error) {
if _, err := exec.LookPath("certutil"); err != nil {
return "", manualInstructions(certPath, "certutil not found (install libnss3-tools on Debian/Ubuntu or nss on Arch)")
}
var installed []string
var errs []string
// Chrome/Chromium user NSS database.
home, err := os.UserHomeDir()
if err == nil {
nssdb := filepath.Join(home, ".pki", "nssdb")
if err := os.MkdirAll(nssdb, 0700); err == nil {
cmd := exec.Command("certutil", "-A", "-n", "Shiv CA", "-t", "CT,,", "-i", certPath, "-d", "sql:"+nssdb)
if cmdOut, err := cmd.CombinedOutput(); err != nil {
errs = append(errs, fmt.Sprintf("Chrome NSS: %v\n%s", err, cmdOut))
} else {
installed = append(installed, "Chrome/Chromium")
}
}
}
// Firefox profiles.
profiles, _ := firefoxProfiles()
for _, profile := range profiles {
cmd := exec.Command("certutil", "-A", "-n", "Shiv CA", "-t", "CT,,", "-i", certPath, "-d", profile)
if out, err := cmd.CombinedOutput(); err != nil {
errs = append(errs, fmt.Sprintf("Firefox profile %s: %v\n%s", profile, err, out))
} else {
installed = append(installed, "Firefox ("+filepath.Base(profile)+")")
}
}
if len(installed) == 0 {
msg := "certutil ran but no stores were updated"
if len(errs) > 0 {
msg = strings.Join(errs, "\n")
}
return "", manualInstructions(certPath, msg)
}
result := "CA certificate installed for: " + strings.Join(installed, ", ") + "."
if len(errs) > 0 {
result += "\nSome stores failed:\n" + strings.Join(errs, "\n")
}
return result, nil
}
func installDarwin(certPath string) (string, error) {
home, err := os.UserHomeDir()
if err != nil {
return "", manualInstructions(certPath, fmt.Sprintf("cannot find home directory: %v", err))
}
loginKeychain := filepath.Join(home, "Library", "Keychains", "login.keychain-db")
cmd := exec.Command("security", "add-trusted-cert",
"-r", "trustRoot",
"-k", loginKeychain,
certPath,
)
if out, err := cmd.CombinedOutput(); err != nil {
return "", manualInstructions(certPath, fmt.Sprintf("security add-trusted-cert failed: %v\n%s", err, out))
}
return "CA certificate installed to macOS login keychain.", nil
}
func installWindows(certPath string) (string, error) {
// certutil is built into Windows, no extra tools needed.
// -user flag installs to current user store, no admin required.
cmd := exec.Command("certutil", "-addstore", "-user", "-f", "ROOT", certPath)
if out, err := cmd.CombinedOutput(); err != nil {
return "", manualInstructions(certPath, fmt.Sprintf("certutil failed: %v\n%s", err, out))
}
return "CA certificate installed to Windows user root store.", nil
}
func firefoxProfiles() ([]string, error) {
home, err := os.UserHomeDir()
if err != nil {
return nil, err
}
var profiles []string
profileDirs := []string{
filepath.Join(home, ".mozilla", "firefox"),
filepath.Join(home, ".librewolf"),
filepath.Join(home, "snap", "firefox", "common", ".mozilla", "firefox"),
filepath.Join(home, ".var", "app", "org.mozilla.firefox", ".mozilla", "firefox"),
filepath.Join(home, ".var", "app", "io.gitlab.librewolf-community", ".librewolf"),
}
for _, dir := range profileDirs {
entries, err := os.ReadDir(dir)
if err != nil {
continue
}
for _, dirEntry := range entries {
if dirEntry.IsDir() {
profiles = append(profiles, filepath.Join(dir, dirEntry.Name()))
}
}
}
return profiles, nil
}
func manualInstructions(certPath, reason string) error {
return errors.New(reason + "\n\n" +
"To install manually, import this file into your browser:\n" +
" " + certPath + "\n\n" +
"Browser instructions:\n" +
" Chrome/Chromium: Settings → Privacy → Security → Manage certificates → Authorities → Import\n" +
" Firefox: Settings → Privacy & Security → Certificates → View Certificates → Authorities → Import\n" +
" NixOS: security.pki.certificateFiles = [ \"" + certPath + "\" ]")
}
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