func witnessTargets(repo *tuf.Repo, invalid *tuf.Repo, role string) error {
if r, ok := repo.Targets[role]; ok {
// role is already valid, mark for re-signing/updating
r.Dirty = true
return nil
}
if roleObj, err := repo.GetDelegationRole(role); err == nil && invalid != nil {
// A role with a threshold > len(keys) is technically invalid, but we let it build in the builder because
// we want to be able to download the role (which may still have targets on it), add more keys, and then
// witness the role, thus bringing it back to valid. However, if no keys have been added before witnessing,
// then it is still an invalid role, and can't be witnessed because nothing can bring it back to valid.
if roleObj.Threshold > len(roleObj.Keys) {
return data.ErrInvalidRole{
Role: role,
Reason: "role does not specify enough valid signing keys to meet its required threshold",
}
}
if r, ok := invalid.Targets[role]; ok {
// role is recognized but invalid, move to valid data and mark for re-signing
repo.Targets[role] = r
r.Dirty = true
return nil
}
}
// role isn't recognized, even as invalid
return data.ErrInvalidRole{
Role: role,
Reason: "this role is not known",
}
}
func changeTargetsDelegation(repo *tuf.Repo, c changelist.Change) error {
switch c.Action() {
case changelist.ActionCreate:
td := changelist.TUFDelegation{}
err := json.Unmarshal(c.Content(), &td)
if err != nil {
return err
}
// Try to create brand new role or update one
// First add the keys, then the paths. We can only add keys and paths in this scenario
err = repo.UpdateDelegationKeys(c.Scope(), td.AddKeys, []string{}, td.NewThreshold)
if err != nil {
return err
}
return repo.UpdateDelegationPaths(c.Scope(), td.AddPaths, []string{}, false)
case changelist.ActionUpdate:
td := changelist.TUFDelegation{}
err := json.Unmarshal(c.Content(), &td)
if err != nil {
return err
}
delgRole, err := repo.GetDelegationRole(c.Scope())
if err != nil {
return err
}
// We need to translate the keys from canonical ID to TUF ID for compatibility
canonicalToTUFID := make(map[string]string)
for tufID, pubKey := range delgRole.Keys {
canonicalID, err := utils.CanonicalKeyID(pubKey)
if err != nil {
return err
}
canonicalToTUFID[canonicalID] = tufID
}
removeTUFKeyIDs := []string{}
for _, canonID := range td.RemoveKeys {
removeTUFKeyIDs = append(removeTUFKeyIDs, canonicalToTUFID[canonID])
}
// If we specify the only keys left delete the role, else just delete specified keys
if strings.Join(delgRole.ListKeyIDs(), ";") == strings.Join(removeTUFKeyIDs, ";") && len(td.AddKeys) == 0 {
return repo.DeleteDelegation(c.Scope())
}
err = repo.UpdateDelegationKeys(c.Scope(), td.AddKeys, removeTUFKeyIDs, td.NewThreshold)
if err != nil {
return err
}
return repo.UpdateDelegationPaths(c.Scope(), td.AddPaths, td.RemovePaths, td.ClearAllPaths)
case changelist.ActionDelete:
return repo.DeleteDelegation(c.Scope())
default:
return fmt.Errorf("unsupported action against delegations: %s", c.Action())
}
}
func validateTargets(role string, roles map[string]storage.MetaUpdate, repo *tuf.Repo) (*data.SignedTargets, error) {
// TODO: when delegations are being validated, validate parent
// role exists for any delegation
s := &data.Signed{}
err := json.Unmarshal(roles[role].Data, s)
if err != nil {
return nil, fmt.Errorf("could not parse %s", role)
}
// version specifically gets validated when writing to store to
// better handle race conditions there.
var targetOrDelgRole data.BaseRole
if role == data.CanonicalTargetsRole {
targetOrDelgRole, err = repo.GetBaseRole(role)
if err != nil {
logrus.Debugf("no %s role loaded", role)
return nil, err
}
} else {
delgRole, err := repo.GetDelegationRole(role)
if err != nil {
logrus.Debugf("no %s delegation role loaded", role)
return nil, err
}
targetOrDelgRole = delgRole.BaseRole
}
if err := signed.Verify(s, targetOrDelgRole, 0); err != nil {
return nil, err
}
t, err := data.TargetsFromSigned(s)
if err != nil {
return nil, err
}
if !data.ValidTUFType(t.Signed.Type, data.CanonicalTargetsRole) {
return nil, fmt.Errorf("%s has wrong type", role)
}
return t, nil
}