// adds a TUF Change template to the given roles
func addChange(cl *changelist.FileChangelist, c changelist.Change, roles ...string) error {
if len(roles) == 0 {
roles = []string{data.CanonicalTargetsRole}
}
var changes []changelist.Change
for _, role := range roles {
// Ensure we can only add targets to the CanonicalTargetsRole,
// or a Delegation role (which is <CanonicalTargetsRole>/something else)
if role != data.CanonicalTargetsRole && !data.IsDelegation(role) && !data.IsWildDelegation(role) {
return data.ErrInvalidRole{
Role: role,
Reason: "cannot add targets to this role",
}
}
changes = append(changes, changelist.NewTUFChange(
c.Action(),
role,
c.Type(),
c.Path(),
c.Content(),
))
}
for _, c := range changes {
if err := cl.Add(c); err != nil {
return err
}
}
return nil
}
func applyChangelist(repo *tuf.Repo, invalid *tuf.Repo, cl changelist.Changelist) error {
it, err := cl.NewIterator()
if err != nil {
return err
}
index := 0
for it.HasNext() {
c, err := it.Next()
if err != nil {
return err
}
isDel := data.IsDelegation(c.Scope()) || data.IsWildDelegation(c.Scope())
switch {
case c.Scope() == changelist.ScopeTargets || isDel:
err = applyTargetsChange(repo, invalid, c)
case c.Scope() == changelist.ScopeRoot:
err = applyRootChange(repo, c)
default:
return fmt.Errorf("scope not supported: %s", c.Scope())
}
if err != nil {
logrus.Debugf("error attempting to apply change #%d: %s, on scope: %s path: %s type: %s", index, c.Action(), c.Scope(), c.Path(), c.Type())
return err
}
index++
}
logrus.Debugf("applied %d change(s)", index)
return nil
}
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
}
if data.IsWildDelegation(c.Scope()) {
return repo.PurgeDelegationKeys(c.Scope(), td.RemoveKeys)
}
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])
}
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())
}
}
// RemoveDelegationKeys creates a changelist entry to remove provided keys from an existing delegation.
// When this changelist is applied, if the specified keys are the only keys left in the role,
// the role itself will be deleted in its entirety.
// It can also delete a key from all delegations under a parent using a name
// with a wildcard at the end.
func (r *NotaryRepository) RemoveDelegationKeys(name string, keyIDs []string) error {
if !data.IsDelegation(name) && !data.IsWildDelegation(name) {
return data.ErrInvalidRole{Role: name, Reason: "invalid delegation role name"}
}
cl, err := changelist.NewFileChangelist(filepath.Join(r.tufRepoPath, "changelist"))
if err != nil {
return err
}
defer cl.Close()
logrus.Debugf(`Removing %s keys from delegation "%s"\n`, keyIDs, name)
tdJSON, err := json.Marshal(&changelist.TUFDelegation{
RemoveKeys: keyIDs,
})
if err != nil {
return err
}
template := newUpdateDelegationChange(name, tdJSON)
return addChange(cl, template, name)
}
// PurgeDelegationKeys removes the provided canonical key IDs from all delegations
// present in the subtree rooted at role. The role argument must be provided in a wildcard
// format, i.e. targets/* would remove the key from all delegations in the repo
func (tr *Repo) PurgeDelegationKeys(role string, removeKeys []string) error {
if !data.IsWildDelegation(role) {
return data.ErrInvalidRole{
Role: role,
Reason: "only wildcard roles can be used in a purge",
}
}
removeIDs := make(map[string]struct{})
for _, id := range removeKeys {
removeIDs[id] = struct{}{}
}
start := path.Dir(role)
tufIDToCanon := make(map[string]string)
purgeKeys := func(tgt *data.SignedTargets, validRole data.DelegationRole) interface{} {
var (
deleteCandidates []string
err error
)
for id, key := range tgt.Signed.Delegations.Keys {
var (
canonID string
ok bool
)
if canonID, ok = tufIDToCanon[id]; !ok {
canonID, err = utils.CanonicalKeyID(key)
if err != nil {
return err
}
tufIDToCanon[id] = canonID
}
if _, ok := removeIDs[canonID]; ok {
deleteCandidates = append(deleteCandidates, id)
}
}
if len(deleteCandidates) == 0 {
// none of the interesting keys were present. We're done with this role
return nil
}
// now we know there are changes, check if we'll be able to sign them in
if err := tr.VerifyCanSign(validRole.Name); err != nil {
logrus.Warnf(
"role %s contains keys being purged but you do not have the necessary keys present to sign it; keys will not be purged from %s or its immediate children",
validRole.Name,
validRole.Name,
)
return nil
}
// we know we can sign in the changes, delete the keys
for _, id := range deleteCandidates {
delete(tgt.Signed.Delegations.Keys, id)
}
// delete candidate keys from all roles.
for _, role := range tgt.Signed.Delegations.Roles {
role.RemoveKeys(deleteCandidates)
if len(role.KeyIDs) < role.Threshold {
logrus.Warnf("role %s has fewer keys than its threshold of %d; it will not be usable until keys are added to it", role.Name, role.Threshold)
}
}
tgt.Dirty = true
return nil
}
return tr.WalkTargets("", start, purgeKeys)
}
