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Dbx Key Management #236

Merged
merged 5 commits into from
Aug 10, 2023
Merged

Dbx Key Management #236

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08428cf
feat(enroll-keys): add partial enrollment of keys
Jul 12, 2023
eb4219c
feat(reset): enable partial resets of secureboot keys
Aug 3, 2023
ac99ff0
Merge branch 'Foxboron:master' into master
Aug 7, 2023
889325e
feat(rotate): enable partial rotation and providing different sources
Aug 7, 2023
31c1228
feat(dbx): enroll/rotate/reset dbx keys
Aug 9, 2023
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31 changes: 30 additions & 1 deletion cmd/sbctl/enroll-keys.go
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ type EnrollKeysCmdOptions struct {
var (
systemEventlog = "/sys/kernel/security/tpm0/binary_bios_measurements"
enrollKeysCmdOptions = EnrollKeysCmdOptions{
Partial: stringset.StringSet{Allowed: []string{"PK", "KEK", "db"}},
Partial: stringset.StringSet{Allowed: []string{"PK", "KEK", "db", "dbx"}},
Export: stringset.StringSet{Allowed: []string{"esl", "auth"}},
}
enrollKeysCmd = &cobra.Command{
Expand Down Expand Up @@ -88,12 +88,22 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
return err
}

dbxPem, err := fs.ReadFile(filepath.Join(keydir, "dbx", "dbx.pem"))
if err != nil {
return err
}

// Create the signature databases
sigdb := signature.NewSignatureDatabase()
if err = sigdb.Append(signature.CERT_X509_GUID, guid, dbPem); err != nil {
return err
}

sigdbx := signature.NewSignatureDatabase()
if err = sigdbx.Append(signature.CERT_X509_GUID, guid, dbxPem); err != nil {
return err
}

sigkek := signature.NewSignatureDatabase()
if err = sigkek.Append(signature.CERT_X509_GUID, guid, KEKPem); err != nil {
return err
Expand Down Expand Up @@ -178,6 +188,12 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
if err != nil {
return err
}

sigdbx, err := sbctl.SignDatabase(sigdbx, KEKKey, KEKPem, "dbx")
if err != nil {
return err
}

sigkek, err := sbctl.SignDatabase(sigkek, PKKey, PKPem, "KEK")
if err != nil {
return err
Expand All @@ -189,6 +205,9 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
if err := fs.WriteFile("db.auth", sigdb, 0o644); err != nil {
return err
}
if err := fs.WriteFile("dbx.auth", sigdbx, 0o644); err != nil {
return err
}
if err := fs.WriteFile("KEK.auth", sigkek, 0o644); err != nil {
return err
}
Expand All @@ -200,6 +219,9 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
if err := fs.WriteFile("db.esl", sigdb.Bytes(), 0o644); err != nil {
return err
}
if err := fs.WriteFile("dbx.esl", sigdbx.Bytes(), 0o644); err != nil {
return err
}
if err := fs.WriteFile("KEK.esl", sigkek.Bytes(), 0o644); err != nil {
return err
}
Expand All @@ -216,6 +238,10 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
if err := sbctl.Enroll(sigdb, KEKKey, KEKPem, value); err != nil {
return err
}
case "dbx":
if err := sbctl.Enroll(sigdbx, KEKKey, KEKPem, value); err != nil {
return err
}
case "KEK":
if err := sbctl.Enroll(sigkek, PKKey, PKPem, value); err != nil {
return err
Expand All @@ -234,6 +260,9 @@ func KeySync(guid util.EFIGUID, keydir string, oems []string) error {
if err := sbctl.Enroll(sigdb, KEKKey, KEKPem, "db"); err != nil {
return err
}
if err := sbctl.Enroll(sigdbx, KEKKey, KEKPem, "dbx"); err != nil {
return err
}
if err := sbctl.Enroll(sigkek, PKKey, PKPem, "KEK"); err != nil {
return err
}
Expand Down
12 changes: 10 additions & 2 deletions cmd/sbctl/import-keys.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@ type ImportKeysCmdOptions struct {
Force bool
DbCert string
DbKey string
DbxCert string
DbxKey string
KEKCert string
KEKKey string
PKCert string
Expand Down Expand Up @@ -52,6 +54,8 @@ func ImportKeysFromDirectory(dir string) error {
"KEK/KEK.pem",
"db/db.key",
"db/db.pem",
"dbx/dbx.key",
"dbx/dbx.pem",
}
dir, err := filepath.Abs(dir)
if err != nil {
Expand All @@ -76,12 +80,13 @@ func ImportKeysFromDirectory(dir string) error {

func RunImportKeys(cmd *cobra.Command, args []string) error {
var err error
var keypairs = []struct {
keypairs := []struct {
Type string
Key string
Cert string
}{
{"db", importKeysCmdOptions.DbKey, importKeysCmdOptions.DbCert},
{"dbx", importKeysCmdOptions.DbxKey, importKeysCmdOptions.DbxCert},
{"KEK", importKeysCmdOptions.KEKKey, importKeysCmdOptions.KEKCert},
{"PK", importKeysCmdOptions.PKKey, importKeysCmdOptions.PKCert},
}
Expand Down Expand Up @@ -110,7 +115,8 @@ func RunImportKeys(cmd *cobra.Command, args []string) error {
}
for src, dst := range map[string]string{
key.Cert: path.Join(sbctl.KeysPath, key.Type, key.Type+".pem"),
key.Key: path.Join(sbctl.KeysPath, key.Type, key.Type+".key")} {
key.Key: path.Join(sbctl.KeysPath, key.Type, key.Type+".key"),
} {
srcFile, err := filepath.Abs(src)
if err != nil {
return err
Expand All @@ -127,6 +133,8 @@ func importKeysCmdFlags(cmd *cobra.Command) {
f := cmd.Flags()
f.StringVarP(&importKeysCmdOptions.DbCert, "db-cert", "", "", "Database (db) certificate")
f.StringVarP(&importKeysCmdOptions.DbKey, "db-key", "", "", "Database (db) key")
f.StringVarP(&importKeysCmdOptions.DbxCert, "dbx-cert", "", "", "Forbidden Database (dbx) certificate")
f.StringVarP(&importKeysCmdOptions.DbxKey, "dbx-key", "", "", "Forbidden Database (dbx) key")
f.StringVarP(&importKeysCmdOptions.KEKCert, "kek-cert", "", "", "Key Exchange Key (KEK) certificate")
f.StringVarP(&importKeysCmdOptions.KEKKey, "kek-key", "", "", "Key Exchange Key (KEK) key")
f.StringVarP(&importKeysCmdOptions.PKCert, "pk-cert", "", "", "Platform Key (PK) certificate")
Expand Down
21 changes: 19 additions & 2 deletions cmd/sbctl/reset.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ type resetCmdOptions struct {

var (
resetCmdOpts = resetCmdOptions{
Partial: stringset.StringSet{Allowed: []string{"PK", "KEK", "db"}},
Partial: stringset.StringSet{Allowed: []string{"PK", "KEK", "db", "dbx"}},
}
resetCmd = &cobra.Command{
Use: "reset",
Expand All @@ -43,6 +43,10 @@ func resetKeys() error {
if err := resetDB(); err != nil {
return err
}
case "dbx":
if err := resetDBX(); err != nil {
return err
}
case "KEK":
if err := resetKEK(); err != nil {
return err
Expand Down Expand Up @@ -71,6 +75,19 @@ func resetDB() error {
return nil
}

func resetDBX() error {
KEKKey := filepath.Join(sbctl.KeysPath, "KEK", "KEK.key")
KEKPem := filepath.Join(sbctl.KeysPath, "KEK", "KEK.pem")

if err := resetDatabase(KEKKey, KEKPem, "dbx"); err != nil {
return err
}

logging.Ok("Removed Fobidden Signature Database!")
logging.Println("Use `sbctl enroll-keys` to enroll the Forbidden Signature Database again.")
return nil
}

func resetKEK() error {
PKKey := filepath.Join(sbctl.KeysPath, "PK", "PK.key")
PKPem := filepath.Join(sbctl.KeysPath, "PK", "PK.pem")
Expand Down Expand Up @@ -132,7 +149,7 @@ func RunReset(cmd *cobra.Command, args []string) error {

func resetKeysCmdFlags(cmd *cobra.Command) {
f := cmd.Flags()
f.VarPF(&resetCmdOpts.Partial, "partial", "p", "enroll a partial set of keys")
f.VarPF(&resetCmdOpts.Partial, "partial", "p", "reset a partial set of keys")
}

func init() {
Expand Down
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