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Support TPM TSS2 key files for signing secure boot things Signed-off-by: Morten Linderud <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| package backend | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto" | ||
| "crypto/rand" | ||
| "crypto/x509" | ||
| "crypto/x509/pkix" | ||
| "encoding/pem" | ||
| "fmt" | ||
| "math/big" | ||
| "path/filepath" | ||
| "time" | ||
|
|
||
| keyfile "github.com/foxboron/go-tpm-keyfiles" | ||
| "github.com/foxboron/sbctl/fs" | ||
| "github.com/foxboron/sbctl/hierarchy" | ||
| "github.com/google/go-tpm/tpm2" | ||
| "github.com/google/go-tpm/tpm2/transport" | ||
| "github.com/spf13/afero" | ||
| ) | ||
|
|
||
| type TPMKey struct { | ||
| *keyfile.TPMKey | ||
| keytype BackendType | ||
| cert *x509.Certificate | ||
| tpm func() transport.TPMCloser | ||
| } | ||
|
|
||
| func NewTPMKey(tpmcb func() transport.TPMCloser, desc string) (*TPMKey, error) { | ||
| rwc := tpmcb() | ||
| key, err := keyfile.NewLoadableKey(rwc, tpm2.TPMAlgRSA, 2048, []byte(nil), | ||
| keyfile.WithDescription(desc), | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128) | ||
| serialNumber, _ := rand.Int(rand.Reader, serialNumberLimit) | ||
| c := x509.Certificate{ | ||
| SerialNumber: serialNumber, | ||
| PublicKeyAlgorithm: x509.RSA, | ||
| SignatureAlgorithm: x509.SHA256WithRSA, | ||
| NotBefore: time.Now(), | ||
| NotAfter: time.Now().AddDate(5, 0, 0), | ||
| Subject: pkix.Name{ | ||
| Country: []string{desc}, | ||
| CommonName: desc, | ||
| }, | ||
| } | ||
|
|
||
| pubkey, err := key.PublicKey() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| signer, err := key.Signer(rwc, []byte(nil), []byte(nil)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| derBytes, err := x509.CreateCertificate(rand.Reader, &c, &c, pubkey, signer) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| cert, err := x509.ParseCertificate(derBytes) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &TPMKey{ | ||
| TPMKey: key, | ||
| cert: cert, | ||
| tpm: tpmcb, | ||
| }, nil | ||
| } | ||
|
|
||
| func (t *TPMKey) Type() BackendType { return t.keytype } | ||
| func (t *TPMKey) Certificate() *x509.Certificate { return t.cert } | ||
| func (t *TPMKey) Description() string { return t.TPMKey.Description } | ||
|
|
||
| func (t *TPMKey) Signer() crypto.Signer { | ||
| s, err := t.TPMKey.Signer(t.tpm(), []byte(nil), []byte(nil)) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return s | ||
| } | ||
|
|
||
| func (t *TPMKey) PrivateKeyBytes() []byte { | ||
| return t.TPMKey.Bytes() | ||
| } | ||
|
|
||
| func (t *TPMKey) CertificateBytes() []byte { | ||
| b := new(bytes.Buffer) | ||
| if err := pem.Encode(b, &pem.Block{Type: "CERTIFICATE", Bytes: t.cert.Raw}); err != nil { | ||
| panic("failed producing PEM encoded certificate") | ||
| } | ||
| return b.Bytes() | ||
| } | ||
|
|
||
| func ReadTPMKey(vfs afero.Fs, tpmcb func() transport.TPMCloser, dir string, hier hierarchy.Hierarchy) (*TPMKey, error) { | ||
| path := filepath.Join(dir, hier.String()) | ||
| keyname := filepath.Join(path, fmt.Sprintf("%s.key", hier.String())) | ||
| certname := filepath.Join(path, fmt.Sprintf("%s.pem", hier.String())) | ||
|
|
||
| // Read privatekey | ||
| keyb, err := fs.ReadFile(vfs, keyname) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Read certificate | ||
| pemb, err := fs.ReadFile(vfs, certname) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return TPMKeyFromBytes(tpmcb, keyb, pemb) | ||
| } | ||
|
|
||
| func TPMKeyFromBytes(tpmcb func() transport.TPMCloser, keyb, pemb []byte) (*TPMKey, error) { | ||
| tpmkey, err := keyfile.Decode(keyb) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed parking tpm keyfile: %v", err) | ||
| } | ||
|
|
||
| block, _ := pem.Decode(pemb) | ||
| if block == nil { | ||
| return nil, fmt.Errorf("no pem block") | ||
| } | ||
|
|
||
| cert, err := x509.ParseCertificate(block.Bytes) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse cert: %w", err) | ||
| } | ||
| return &TPMKey{ | ||
| TPMKey: tpmkey, | ||
| keytype: TPMBackend, | ||
| cert: cert, | ||
| tpm: tpmcb, | ||
| }, nil | ||
| } |
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