DockerCLI/vendor/github.com/docker/notary/client/helpers.go

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package client
import (
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/notary/client/changelist"
store "github.com/docker/notary/storage"
"github.com/docker/notary/tuf"
"github.com/docker/notary/tuf/data"
"github.com/docker/notary/tuf/utils"
)
// Use this to initialize remote HTTPStores from the config settings
func getRemoteStore(baseURL, gun string, rt http.RoundTripper) (store.RemoteStore, error) {
s, err := store.NewHTTPStore(
baseURL+"/v2/"+gun+"/_trust/tuf/",
"",
"json",
"key",
rt,
)
if err != nil {
return store.OfflineStore{}, err
}
return s, err
}
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 applyTargetsChange(repo *tuf.Repo, invalid *tuf.Repo, c changelist.Change) error {
switch c.Type() {
case changelist.TypeTargetsTarget:
return changeTargetMeta(repo, c)
case changelist.TypeTargetsDelegation:
return changeTargetsDelegation(repo, c)
case changelist.TypeWitness:
return witnessTargets(repo, invalid, c.Scope())
default:
return fmt.Errorf("only target meta and delegations changes supported")
}
}
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())
}
}
func changeTargetMeta(repo *tuf.Repo, c changelist.Change) error {
var err error
switch c.Action() {
case changelist.ActionCreate:
logrus.Debug("changelist add: ", c.Path())
meta := &data.FileMeta{}
err = json.Unmarshal(c.Content(), meta)
if err != nil {
return err
}
files := data.Files{c.Path(): *meta}
// Attempt to add the target to this role
if _, err = repo.AddTargets(c.Scope(), files); err != nil {
logrus.Errorf("couldn't add target to %s: %s", c.Scope(), err.Error())
}
case changelist.ActionDelete:
logrus.Debug("changelist remove: ", c.Path())
// Attempt to remove the target from this role
if err = repo.RemoveTargets(c.Scope(), c.Path()); err != nil {
logrus.Errorf("couldn't remove target from %s: %s", c.Scope(), err.Error())
}
default:
err = fmt.Errorf("action not yet supported: %s", c.Action())
}
return err
}
func applyRootChange(repo *tuf.Repo, c changelist.Change) error {
var err error
switch c.Type() {
case changelist.TypeRootRole:
err = applyRootRoleChange(repo, c)
default:
err = fmt.Errorf("type of root change not yet supported: %s", c.Type())
}
return err // might be nil
}
func applyRootRoleChange(repo *tuf.Repo, c changelist.Change) error {
switch c.Action() {
case changelist.ActionCreate:
// replaces all keys for a role
d := &changelist.TUFRootData{}
err := json.Unmarshal(c.Content(), d)
if err != nil {
return err
}
err = repo.ReplaceBaseKeys(d.RoleName, d.Keys...)
if err != nil {
return err
}
default:
return fmt.Errorf("action not yet supported for root: %s", c.Action())
}
return nil
}
func nearExpiry(r data.SignedCommon) bool {
plus6mo := time.Now().AddDate(0, 6, 0)
return r.Expires.Before(plus6mo)
}
func warnRolesNearExpiry(r *tuf.Repo) {
//get every role and its respective signed common and call nearExpiry on it
//Root check
if nearExpiry(r.Root.Signed.SignedCommon) {
logrus.Warn("root is nearing expiry, you should re-sign the role metadata")
}
//Targets and delegations check
for role, signedTOrD := range r.Targets {
//signedTOrD is of type *data.SignedTargets
if nearExpiry(signedTOrD.Signed.SignedCommon) {
logrus.Warn(role, " metadata is nearing expiry, you should re-sign the role metadata")
}
}
//Snapshot check
if nearExpiry(r.Snapshot.Signed.SignedCommon) {
logrus.Warn("snapshot is nearing expiry, you should re-sign the role metadata")
}
//do not need to worry about Timestamp, notary signer will re-sign with the timestamp key
}
// Fetches a public key from a remote store, given a gun and role
func getRemoteKey(url, gun, role string, rt http.RoundTripper) (data.PublicKey, error) {
remote, err := getRemoteStore(url, gun, rt)
if err != nil {
return nil, err
}
rawPubKey, err := remote.GetKey(role)
if err != nil {
return nil, err
}
pubKey, err := data.UnmarshalPublicKey(rawPubKey)
if err != nil {
return nil, err
}
return pubKey, nil
}
// Rotates a private key in a remote store and returns the public key component
func rotateRemoteKey(url, gun, role string, rt http.RoundTripper) (data.PublicKey, error) {
remote, err := getRemoteStore(url, gun, rt)
if err != nil {
return nil, err
}
rawPubKey, err := remote.RotateKey(role)
if err != nil {
return nil, err
}
pubKey, err := data.UnmarshalPublicKey(rawPubKey)
if err != nil {
return nil, err
}
return pubKey, nil
}
// signs and serializes the metadata for a canonical role in a TUF repo to JSON
func serializeCanonicalRole(tufRepo *tuf.Repo, role string) (out []byte, err error) {
var s *data.Signed
switch {
case role == data.CanonicalRootRole:
s, err = tufRepo.SignRoot(data.DefaultExpires(role))
case role == data.CanonicalSnapshotRole:
s, err = tufRepo.SignSnapshot(data.DefaultExpires(role))
case tufRepo.Targets[role] != nil:
s, err = tufRepo.SignTargets(
role, data.DefaultExpires(data.CanonicalTargetsRole))
default:
err = fmt.Errorf("%s not supported role to sign on the client", role)
}
if err != nil {
return
}
return json.Marshal(s)
}