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Finish implementation of openpgp signing

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This commit is contained in:
Jan Dittberner 2021-01-08 10:14:11 +01:00
parent c8e6792622
commit 6cd132b3f7
4 changed files with 50 additions and 19 deletions
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2
signer/command_processor.go
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@ -312,7 +312,7 @@ func (p *CommandProcessor) signX509Certificate(system *IdSystemParameters, days
func (p *CommandProcessor) signOpenpgpKey(system *IdSystemParameters, days uint16, pubKey []byte) ([]byte, error) {
openPgpRoot := system.Root.(*openpgp_ops.OpenPGPRoot)
signatureAlgorithm := system.MessageDigestAlgorithm.(*crypto.Hash)
signatureAlgorithm := system.MessageDigestAlgorithm.(crypto.Hash)
log.Debugf("sign openpgp for root %s", openPgpRoot)

59
signer/openpgp_ops/operations.go
View file

@ -9,6 +9,7 @@ import (
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
)
@ -18,7 +19,7 @@ type OpenPGPRoot struct {
Identifier string
}
func (r *OpenPGPRoot) SignPublicKey(pubKey []byte, algorithm *crypto.Hash, days uint16) ([]byte, error) {
func (r *OpenPGPRoot) SignPublicKey(pubKey []byte, algorithm crypto.Hash, days uint16) ([]byte, error) {
signingKey, err := r.findSigningKey(r.Identifier)
if err != nil {
return nil, fmt.Errorf("could not find a signing key matching %s: %v", r.Identifier, err)
@ -29,30 +30,60 @@ func (r *OpenPGPRoot) SignPublicKey(pubKey []byte, algorithm *crypto.Hash, days
return nil, fmt.Errorf("could not read openpgp keyring: %v", err)
}
signatures := make([]*openpgp.Entity, 0)
output := bytes.NewBuffer([]byte{})
armorOutput, err := armor.Encode(output, "PGP PUBLIC KEY BLOCK", map[string]string{})
if err != nil {
return nil, fmt.Errorf("could not create ASCII armor wrapper for openpgp output: %v", err)
}
for _, pe := range pubKeyRing {
log.Tracef("found %+v", pe)
log.Tracef("found %+v", pe.PrimaryKey.KeyIdString())
for _, i := range pe.Identities {
expiry := calculateExpiry(i, days)
if !i.SelfSignature.KeyExpired(time.Now()) {
signConfig := &packet.Config{
DefaultHash: *algorithm,
Time: func() { return calculateExpiry(i, days) },
sig := &packet.Signature{
SigType: packet.SigTypeGenericCert,
PubKeyAlgo: signingKey.PrivateKey.PubKeyAlgo,
Hash: algorithm,
CreationTime: time.Now(),
SigLifetimeSecs: expiry,
IssuerKeyId: &signingKey.PrivateKey.KeyId,
}
pe.SignIdentity(i.Name, signingKey, signConfig)
if err := sig.SignUserId(i.Name, pe.PrimaryKey, signingKey.PrivateKey, &packet.Config{
DefaultHash: algorithm,
}); err != nil {
return nil, fmt.Errorf("could not sign identity %s: %v", i.Name, err)
}
i.Signatures = append(i.Signatures, sig)
}
}
if err = pe.Serialize(armorOutput); err != nil {
return nil, fmt.Errorf(
"could not write signed public key %s to output: %v",
pe.PrimaryKey.KeyIdString(),
err,
)
}
}
if err = armorOutput.Close(); err != nil {
return nil, fmt.Errorf("could not close output stream: %v", err)
}
log.Tracef("signed public key\n%s", output.String())
return output.Bytes(), nil
}
func calculateExpiry(i *openpgp.Identity, days uint16) time.Time {
maxExpiry := i.SelfSignature.CreationTime.Add(time.Second * time.Duration(*i.SelfSignature.KeyLifetimeSecs))
calcExpiry := time.Now().Add(time.Hour * 24 * time.Duration(days))
func calculateExpiry(i *openpgp.Identity, days uint16) *uint32 {
maxExpiry := time.Second * time.Duration(*i.SelfSignature.KeyLifetimeSecs)
calcExpiry := time.Hour * 24 * time.Duration(days)
if calcExpiry.After(maxExpiry) {
return maxExpiry
if calcExpiry > maxExpiry {
calcExpiry = maxExpiry
}
return maxExpiry
expirySeconds := uint32(calcExpiry.Seconds())
return &expirySeconds
}
func (r *OpenPGPRoot) findSigningKey(identifier string) (*openpgp.Entity, error) {
@ -67,7 +98,7 @@ func (r *OpenPGPRoot) findSigningKey(identifier string) (*openpgp.Entity, error)
return nil, fmt.Errorf("could not read keyring: %v", err)
}
for _, e := range el {
log.Tracef("found %+v", e)
log.Tracef("found %s", e.PrimaryKey.KeyIdString())
for _, i := range e.Identities {
if i.UserId.Email == identifier && len(e.Revocations) == 0 && !i.SelfSignature.KeyExpired(time.Now()) {
return e, nil