/
nss.go
457 lines (378 loc) · 9.9 KB
/
nss.go
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package truststore
import (
"bytes"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/fs"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"sync"
)
type NSS struct {
HomeDir string
DataFS fs.StatFS
SysFS CmdFS
inito sync.Once
dbPaths []string
certutilPath string
certutilInstallHelp string
firefoxProfiles []string
}
const (
certUtilBadDatabaseOutput = "SEC_ERROR_BAD_DATABASE"
certUtilPRFileNotFoundOutput = "PR_FILE_NOT_FOUND_ERROR"
certUtilSecReadOnlyOutput = "SEC_ERROR_READ_ONLY"
)
var firefoxPaths = []string{
"/usr/bin/firefox",
"/usr/bin/firefox-nightly",
"/usr/bin/firefox-developer-edition",
"/snap/firefox",
"/Applications/Firefox.app",
"/Applications/FirefoxDeveloperEdition.app",
"/Applications/Firefox Developer Edition.app",
"/Applications/Firefox Nightly.app",
"C:\\Program Files\\Mozilla Firefox",
}
func (s *NSS) init() {
s.inito.Do(func() {
dbPaths := []string{
filepath.Join(s.HomeDir, ".pki/nssdb"),
filepath.Join(s.HomeDir, "snap/chromium/current/.pki/nssdb"), // Snapcraft
"/etc/pki/nssdb", // CentOS 7
}
allPaths := append(append([]string{}, dbPaths...), firefoxPaths...)
for _, path := range allPaths {
if pathExists(s.DataFS, path) {
s.dbPaths = append(s.dbPaths, path)
}
}
switch runtime.GOOS {
case "darwin":
switch {
case binaryExists(s.SysFS, "certutil"):
s.certutilPath, _ = s.SysFS.LookPath("certutil")
case binaryExists(s.SysFS, "/usr/local/opt/nss/bin/certutil"):
// Check the default Homebrew path, to save executing Ruby. #135
s.certutilPath = "/usr/local/opt/nss/bin/certutil"
default:
if out, err := s.SysFS.Exec(s.SysFS.Command("brew", "--prefix", "nss")); err != nil {
certutilPath := filepath.Join(strings.TrimSpace(string(out)), "bin", "certutil")
if pathExists(s.DataFS, certutilPath) {
s.certutilPath = certutilPath
}
}
}
case "linux":
if binaryExists(s.SysFS, "certutil") {
s.certutilPath, _ = s.SysFS.LookPath("certutil")
}
}
s.certutilInstallHelp = certutilInstallHelp(s.SysFS)
s.firefoxProfiles = firefoxProfiles(s.HomeDir)
})
}
func (s *NSS) Browsers() string { return nssBrowsers }
func (s *NSS) Check() (bool, error) {
s.init()
if s.dbPaths == nil {
return false, Error{
Op: OpCheck,
Warning: NSSError{
Err: ErrNoNSSDB,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
if s.certutilPath == "" {
return false, Error{
Op: OpCheck,
Warning: NSSError{
Err: ErrNoCertutil,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
count, _ := s.forEachNSSProfile(func(profile string) error {
return nil
})
if count == 0 {
return false, Error{
Op: OpInstall,
Warning: NSSError{
Err: ErrNoNSSDB,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
return true, nil
}
func (s *NSS) CheckCA(ca *CA) (installed bool, err error) {
s.init()
if s.certutilPath == "" {
return false, nil // TODO: return a NSSError here
}
count, err := s.forEachNSSProfile(func(profile string) error {
out, err := s.SysFS.Exec(s.SysFS.Command(s.certutilPath, "-V", "-d", profile, "-u", "L", "-n", ca.UniqueName))
err = s.handleCertUtilResult(profile, out, err)
if err != nil {
return err
}
return nil
})
if err != nil {
var exerr *exec.ExitError
if errors.As(err, &exerr) && exerr.ProcessState.ExitCode() == 255 {
return false, nil
}
return false, Error{
Op: OpCheck,
Warning: NSSError{
Err: err,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
return count != 0, err
}
func (s *NSS) Description() string { return "Network Security Services (NSS)" }
func (s *NSS) InstallCA(ca *CA) (installed bool, err error) {
s.init()
if s.certutilPath == "" {
if s.certutilInstallHelp == "" {
return false, Error{
Op: OpInstall,
Warning: NSSError{
Err: ErrNoNSS,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
return false, Error{
Op: OpInstall,
Warning: NSSError{
Err: ErrNoCertutil,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
count, err := s.forEachNSSProfile(func(profile string) error {
args := []string{
"-A", "-d", profile,
"-t", "C,,",
"-n", ca.UniqueName,
"-i", ca.FilePath,
}
out, err := s.execCertutil(s.certutilPath, args...)
err = s.handleCertUtilResult(profile, out, err)
if err != nil {
return err
}
return nil
})
if err != nil {
return false, err
}
if count == 0 {
return false, Error{
Op: OpInstall,
Warning: NSSError{
Err: ErrNoNSSDB,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
if ok, _ := s.CheckCA(ca); !ok {
return false, Error{Warning: ErrUnknownNSS}
}
return true, nil
}
func (s *NSS) ListCAs() ([]*CA, error) {
s.init()
if s.certutilPath == "" {
return nil, NSSError{
Err: ErrNoNSS,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
var cas []*CA
_, err := s.forEachNSSProfile(func(profile string) error {
out, err := s.SysFS.Exec(s.SysFS.Command(s.certutilPath, "-L", "-d", profile))
err = s.handleCertUtilResult(profile, out, err)
if err != nil {
return err
}
lines := strings.Split(strings.TrimSpace(string(out)), "\n")
if len(lines) < 2 {
return NSSError{
Err: errors.New("unexpected certutil output"),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
padLen := strings.Index(lines[0], "Trust Attributes")
if padLen <= 0 {
return NSSError{
Err: errors.New("certutil unexpected output format"),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
if len(lines) == 2 {
return nil // no certs in the output
}
var nicks []string
for _, line := range lines[3:] {
if len(line) < padLen {
return NSSError{
Err: errors.New("certutil unexpected line format"),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
nicks = append(nicks, strings.TrimSpace(line[:padLen]))
}
for _, nick := range nicks {
out, err := s.SysFS.Exec(s.SysFS.Command(s.certutilPath, "-L", "-d", profile, "-n", nick, "-a"))
err = s.handleCertUtilResult(profile, out, err)
if err != nil {
return err
}
for p, buf := pem.Decode(out); p != nil; p, buf = pem.Decode(buf) {
cert, err := x509.ParseCertificate(p.Bytes)
if err != nil {
return err
}
ca := &CA{
Certificate: cert,
NickName: nick,
UniqueName: cert.SerialNumber.Text(16),
}
cas = append(cas, ca)
}
}
return nil
})
if err != nil {
return nil, err
}
return cas, nil
}
func (s *NSS) UninstallCA(ca *CA) (bool, error) {
s.init()
if s.certutilPath == "" {
if s.certutilInstallHelp == "" {
return false, Error{
Op: OpUninstall,
Warning: NSSError{
Err: ErrNoNSS,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
return false, Error{
Op: OpUninstall,
Warning: NSSError{
Err: ErrNoCertutil,
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
},
}
}
// if we don't have a nickname value available, fallback to UniqueName
nickName := ca.NickName
if nickName == "" {
nickName = ca.UniqueName
}
_, err := s.forEachNSSProfile(func(profile string) error {
args := []string{
"-V", "-d", profile,
"-u", "L",
"-n", nickName,
}
if out, err := s.SysFS.Exec(s.SysFS.Command(s.certutilPath, args...)); err != nil {
// continue if this profile does not have a ca with this nickname
if bytes.Contains(out, []byte(certUtilPRFileNotFoundOutput)) {
return nil
}
}
// TODO: ensure the certificate has our extension before removal
args = []string{
"-D", "-d", profile,
"-n", nickName,
}
out, err := s.execCertutil(s.certutilPath, args...)
err = s.handleCertUtilResult(profile, out, err)
if err != nil {
return err
}
return nil
})
return err == nil, err
}
// execCertutil will execute a "certutil" command and if needed re-execute
// the command with commandWithSudo to work around file permissions.
func (s *NSS) execCertutil(path string, arg ...string) ([]byte, error) {
out, err := s.SysFS.Exec(s.SysFS.Command(path, arg...))
if err != nil && bytes.Contains(out, []byte(certUtilSecReadOnlyOutput)) && runtime.GOOS != "windows" {
out, err = s.SysFS.SudoExec(s.SysFS.Command(path, arg...))
}
return out, err
}
func (s *NSS) forEachNSSProfile(f func(profile string) error) (found int, err error) {
var profiles []string
profiles = append(profiles, s.dbPaths...)
for _, ff := range s.firefoxProfiles {
pp, _ := filepath.Glob(ff)
profiles = append(profiles, pp...)
}
for _, profile := range profiles {
if stat, err := os.Stat(profile); err != nil || !stat.IsDir() {
continue
}
if pathExists(s.DataFS, filepath.Join(profile, "cert9.db")) {
if err := f("sql:" + profile); err != nil {
return 0, NSSError{
Err: errors.New("`sql:" + profile + "` " + err.Error()),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
found++
} else if pathExists(s.DataFS, filepath.Join(profile, "cert8.db")) {
if err := f("dbm:" + profile); err != nil {
return 0, NSSError{
Err: errors.New("`dbm:" + profile + "` " + err.Error()),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
found++
}
}
return
}
func (s *NSS) handleCertUtilResult(profile string, out []byte, err error) error {
if err != nil {
return NSSError{
Err: fmt.Errorf("`%s` %q", profile, out),
CertutilInstallHelp: s.certutilInstallHelp,
NSSBrowsers: nssBrowsers,
}
}
return nil
}