// GetDelegation finds the role entry representing the provided
// role name or ErrInvalidRole
func (tr *Repo) GetDelegation(role string) (*data.Role, error) {
r := data.Role{Name: role}
if !r.IsDelegation() {
return nil, data.ErrInvalidRole{Role: role, Reason: "not a valid delegated role"}
}
parent := path.Dir(role)
// check the parent role
if parentRole := tr.keysDB.GetRole(parent); parentRole == nil {
return nil, data.ErrInvalidRole{Role: role, Reason: "parent role not found"}
}
// check the parent role's metadata
p, ok := tr.Targets[parent]
if !ok { // the parent targetfile may not exist yet, so it can't be in the list
return nil, data.ErrNoSuchRole{Role: role}
}
foundAt := utils.FindRoleIndex(p.Signed.Delegations.Roles, role)
if foundAt < 0 {
return nil, data.ErrNoSuchRole{Role: role}
}
return p.Signed.Delegations.Roles[foundAt], nil
}
// UpdateDelegations updates the appropriate delegations, either adding
// a new delegation or updating an existing one. If keys are
// provided, the IDs will be added to the role (if they do not exist
// there already), and the keys will be added to the targets file.
func (tr *Repo) UpdateDelegations(role *data.Role, keys []data.PublicKey) error {
if !role.IsDelegation() || !role.IsValid() {
return data.ErrInvalidRole{Role: role.Name, Reason: "not a valid delegated role"}
}
parent := path.Dir(role.Name)
if err := tr.VerifyCanSign(parent); err != nil {
return err
}
// check the parent role's metadata
p, ok := tr.Targets[parent]
if !ok { // the parent targetfile may not exist yet - if not, then create it
var err error
p, err = tr.InitTargets(parent)
if err != nil {
return err
}
}
for _, k := range keys {
if !utils.StrSliceContains(role.KeyIDs, k.ID()) {
role.KeyIDs = append(role.KeyIDs, k.ID())
}
p.Signed.Delegations.Keys[k.ID()] = k
tr.keysDB.AddKey(k)
}
// if the role has fewer keys than the threshold, it
// will never be able to create a valid targets file
// and should be considered invalid.
if len(role.KeyIDs) < role.Threshold {
return data.ErrInvalidRole{Role: role.Name, Reason: "insufficient keys to meet threshold"}
}
foundAt := utils.FindRoleIndex(p.Signed.Delegations.Roles, role.Name)
if foundAt >= 0 {
p.Signed.Delegations.Roles[foundAt] = role
} else {
p.Signed.Delegations.Roles = append(p.Signed.Delegations.Roles, role)
}
// We've made a change to parent. Set it to dirty
p.Dirty = true
// We don't actually want to create the new delegation metadata yet.
// When we add a delegation, it may only be signable by a key we don't have
// (hence we are delegating signing).
tr.keysDB.AddRole(role)
utils.RemoveUnusedKeys(p)
return nil
}
// InitTargets initializes an empty targets, and returns the new empty target
func (tr *Repo) InitTargets(role string) (*data.SignedTargets, error) {
r := data.Role{Name: role}
if !r.IsDelegation() && role != data.CanonicalTargetsRole {
return nil, data.ErrInvalidRole{
Role: role,
Reason: fmt.Sprintf("role is not a valid targets role name: %s", role),
}
}
targets := data.NewTargets()
tr.Targets[role] = targets
return targets, nil
}
// DeleteDelegation removes a delegated targets role from its parent
// targets object. It also deletes the delegation from the snapshot.
// DeleteDelegation will only make use of the role Name field.
func (tr *Repo) DeleteDelegation(role data.Role) error {
if !role.IsDelegation() {
return data.ErrInvalidRole{Role: role.Name, Reason: "not a valid delegated role"}
}
// the role variable must not be used past this assignment for safety
name := role.Name
parent := path.Dir(name)
if err := tr.VerifyCanSign(parent); err != nil {
return err
}
// delete delegated data from Targets map and Snapshot - if they don't
// exist, these are no-op
delete(tr.Targets, name)
tr.Snapshot.DeleteMeta(name)
p, ok := tr.Targets[parent]
if !ok {
// if there is no parent metadata (the role exists though), then this
// is as good as done.
return nil
}
foundAt := utils.FindRoleIndex(p.Signed.Delegations.Roles, name)
if foundAt >= 0 {
var roles []*data.Role
// slice out deleted role
roles = append(roles, p.Signed.Delegations.Roles[:foundAt]...)
if foundAt+1 < len(p.Signed.Delegations.Roles) {
roles = append(roles, p.Signed.Delegations.Roles[foundAt+1:]...)
}
p.Signed.Delegations.Roles = roles
utils.RemoveUnusedKeys(p)
p.Dirty = true
} // if the role wasn't found, it's a good as deleted
return nil
}
// UpdateDelegations updates the appropriate delegations, either adding
// a new delegation or updating an existing one. If keys are
// provided, the IDs will be added to the role (if they do not exist
// there already), and the keys will be added to the targets file.
// The "before" argument specifies another role which this new role
// will be added in front of (i.e. higher priority) in the delegation list.
// An empty before string indicates to add the role to the end of the
// delegation list.
// A new, empty, targets file will be created for the new role.
func (tr *Repo) UpdateDelegations(role *data.Role, keys []data.PublicKey, before string) error {
if !role.IsDelegation() || !role.IsValid() {
return data.ErrInvalidRole{Role: role.Name}
}
parent := filepath.Dir(role.Name)
p, ok := tr.Targets[parent]
if !ok {
return data.ErrInvalidRole{Role: role.Name}
}
for _, k := range keys {
if !utils.StrSliceContains(role.KeyIDs, k.ID()) {
role.KeyIDs = append(role.KeyIDs, k.ID())
}
p.Signed.Delegations.Keys[k.ID()] = k
tr.keysDB.AddKey(k)
}
i := -1
var r *data.Role
for i, r = range p.Signed.Delegations.Roles {
if r.Name == role.Name {
break
}
}
if i >= 0 {
p.Signed.Delegations.Roles[i] = role
} else {
p.Signed.Delegations.Roles = append(p.Signed.Delegations.Roles, role)
}
p.Dirty = true
roleTargets := data.NewTargets() // NewTargets always marked Dirty
tr.Targets[role.Name] = roleTargets
tr.keysDB.AddRole(role)
return nil
}