mirror of https://github.com/docker/cli.git
113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
package signed
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import (
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/go/canonical/json"
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"github.com/docker/notary/tuf/data"
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)
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// Various basic signing errors
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var (
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ErrMissingKey = errors.New("tuf: missing key")
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ErrNoSignatures = errors.New("tuf: data has no signatures")
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ErrInvalid = errors.New("tuf: signature verification failed")
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ErrWrongMethod = errors.New("tuf: invalid signature type")
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ErrUnknownRole = errors.New("tuf: unknown role")
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ErrWrongType = errors.New("tuf: meta file has wrong type")
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)
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// IsExpired checks if the given time passed before the present time
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func IsExpired(t time.Time) bool {
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return t.Before(time.Now())
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}
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// VerifyExpiry returns ErrExpired if the metadata is expired
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func VerifyExpiry(s *data.SignedCommon, role string) error {
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if IsExpired(s.Expires) {
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logrus.Errorf("Metadata for %s expired", role)
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return ErrExpired{Role: role, Expired: s.Expires.Format("Mon Jan 2 15:04:05 MST 2006")}
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}
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return nil
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}
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// VerifyVersion returns ErrLowVersion if the metadata version is lower than the min version
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func VerifyVersion(s *data.SignedCommon, minVersion int) error {
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if s.Version < minVersion {
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return ErrLowVersion{Actual: s.Version, Current: minVersion}
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}
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return nil
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}
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// VerifySignatures checks the we have sufficient valid signatures for the given role
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func VerifySignatures(s *data.Signed, roleData data.BaseRole) error {
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if len(s.Signatures) == 0 {
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return ErrNoSignatures
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}
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if roleData.Threshold < 1 {
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return ErrRoleThreshold{}
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}
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logrus.Debugf("%s role has key IDs: %s", roleData.Name, strings.Join(roleData.ListKeyIDs(), ","))
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// remarshal the signed part so we can verify the signature, since the signature has
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// to be of a canonically marshalled signed object
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var decoded map[string]interface{}
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if err := json.Unmarshal(*s.Signed, &decoded); err != nil {
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return err
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}
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msg, err := json.MarshalCanonical(decoded)
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if err != nil {
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return err
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}
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valid := make(map[string]struct{})
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for i := range s.Signatures {
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sig := &(s.Signatures[i])
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logrus.Debug("verifying signature for key ID: ", sig.KeyID)
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key, ok := roleData.Keys[sig.KeyID]
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if !ok {
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logrus.Debugf("continuing b/c keyid lookup was nil: %s\n", sig.KeyID)
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continue
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}
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// Check that the signature key ID actually matches the content ID of the key
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if key.ID() != sig.KeyID {
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return ErrInvalidKeyID{}
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}
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if err := VerifySignature(msg, sig, key); err != nil {
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logrus.Debugf("continuing b/c %s", err.Error())
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continue
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}
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valid[sig.KeyID] = struct{}{}
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}
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if len(valid) < roleData.Threshold {
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return ErrRoleThreshold{
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Msg: fmt.Sprintf("valid signatures did not meet threshold for %s", roleData.Name),
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}
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}
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return nil
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}
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// VerifySignature checks a single signature and public key against a payload
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// If the signature is verified, the signature's is valid field will actually
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// be mutated to be equal to the boolean true
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func VerifySignature(msg []byte, sig *data.Signature, pk data.PublicKey) error {
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// method lookup is consistent due to Unmarshal JSON doing lower case for us.
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method := sig.Method
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verifier, ok := Verifiers[method]
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if !ok {
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return fmt.Errorf("signing method is not supported: %s\n", sig.Method)
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}
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if err := verifier.Verify(pk, sig.Signature, msg); err != nil {
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return fmt.Errorf("signature was invalid\n")
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}
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sig.IsValid = true
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return nil
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}
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