DockerCLI/cli/command/trust/common.go

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package trust
import (
"context"
"encoding/hex"
"fmt"
"sort"
"strings"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/image"
"github.com/docker/cli/cli/trust"
"github.com/sirupsen/logrus"
"github.com/theupdateframework/notary"
"github.com/theupdateframework/notary/client"
"github.com/theupdateframework/notary/tuf/data"
)
// trustTagKey represents a unique signed tag and hex-encoded hash pair
type trustTagKey struct {
SignedTag string
Digest string
}
// trustTagRow encodes all human-consumable information for a signed tag, including signers
type trustTagRow struct {
trustTagKey
Signers []string
}
type trustTagRowList []trustTagRow
func (tagComparator trustTagRowList) Len() int {
return len(tagComparator)
}
func (tagComparator trustTagRowList) Less(i, j int) bool {
return tagComparator[i].SignedTag < tagComparator[j].SignedTag
}
func (tagComparator trustTagRowList) Swap(i, j int) {
tagComparator[i], tagComparator[j] = tagComparator[j], tagComparator[i]
}
// trustRepo represents consumable information about a trusted repository
type trustRepo struct {
Name string
SignedTags trustTagRowList
Signers []trustSigner
AdminstrativeKeys []trustSigner
}
// trustSigner represents a trusted signer in a trusted repository
// a signer is defined by a name and list of trustKeys
type trustSigner struct {
Name string `json:",omitempty"`
Keys []trustKey `json:",omitempty"`
}
// trustKey contains information about trusted keys
type trustKey struct {
ID string `json:",omitempty"`
}
// lookupTrustInfo returns processed signature and role information about a notary repository.
// This information is to be pretty printed or serialized into a machine-readable format.
func lookupTrustInfo(cli command.Cli, remote string) (trustTagRowList, []client.RoleWithSignatures, []data.Role, error) {
ctx := context.Background()
imgRefAndAuth, err := trust.GetImageReferencesAndAuth(ctx, nil, image.AuthResolver(cli), remote)
if err != nil {
return trustTagRowList{}, []client.RoleWithSignatures{}, []data.Role{}, err
}
tag := imgRefAndAuth.Tag()
notaryRepo, err := cli.NotaryClient(imgRefAndAuth, trust.ActionsPullOnly)
if err != nil {
return trustTagRowList{}, []client.RoleWithSignatures{}, []data.Role{}, trust.NotaryError(imgRefAndAuth.Reference().Name(), err)
}
if err = clearChangeList(notaryRepo); err != nil {
return trustTagRowList{}, []client.RoleWithSignatures{}, []data.Role{}, err
}
defer clearChangeList(notaryRepo)
// Retrieve all released signatures, match them, and pretty print them
allSignedTargets, err := notaryRepo.GetAllTargetMetadataByName(tag)
if err != nil {
logrus.Debug(trust.NotaryError(remote, err))
// print an empty table if we don't have signed targets, but have an initialized notary repo
if _, ok := err.(client.ErrNoSuchTarget); !ok {
return trustTagRowList{}, []client.RoleWithSignatures{}, []data.Role{}, fmt.Errorf("No signatures or cannot access %s", remote)
}
}
signatureRows := matchReleasedSignatures(allSignedTargets)
// get the administrative roles
adminRolesWithSigs, err := notaryRepo.ListRoles()
if err != nil {
return trustTagRowList{}, []client.RoleWithSignatures{}, []data.Role{}, fmt.Errorf("No signers for %s", remote)
}
// get delegation roles with the canonical key IDs
delegationRoles, err := notaryRepo.GetDelegationRoles()
if err != nil {
logrus.Debugf("no delegation roles found, or error fetching them for %s: %v", remote, err)
}
return signatureRows, adminRolesWithSigs, delegationRoles, nil
}
func formatAdminRole(roleWithSigs client.RoleWithSignatures) string {
adminKeyList := roleWithSigs.KeyIDs
sort.Strings(adminKeyList)
var role string
switch roleWithSigs.Name {
case data.CanonicalTargetsRole:
role = "Repository Key"
case data.CanonicalRootRole:
role = "Root Key"
default:
return ""
}
return fmt.Sprintf("%s:\t%s\n", role, strings.Join(adminKeyList, ", "))
}
func getDelegationRoleToKeyMap(rawDelegationRoles []data.Role) map[string][]string {
signerRoleToKeyIDs := make(map[string][]string)
for _, delRole := range rawDelegationRoles {
switch delRole.Name {
case trust.ReleasesRole, data.CanonicalRootRole, data.CanonicalSnapshotRole, data.CanonicalTargetsRole, data.CanonicalTimestampRole:
continue
default:
signerRoleToKeyIDs[notaryRoleToSigner(delRole.Name)] = delRole.KeyIDs
}
}
return signerRoleToKeyIDs
}
// aggregate all signers for a "released" hash+tagname pair. To be "released," the tag must have been
// signed into the "targets" or "targets/releases" role. Output is sorted by tag name
func matchReleasedSignatures(allTargets []client.TargetSignedStruct) trustTagRowList {
signatureRows := trustTagRowList{}
// do a first pass to get filter on tags signed into "targets" or "targets/releases"
releasedTargetRows := map[trustTagKey][]string{}
for _, tgt := range allTargets {
if isReleasedTarget(tgt.Role.Name) {
releasedKey := trustTagKey{tgt.Target.Name, hex.EncodeToString(tgt.Target.Hashes[notary.SHA256])}
releasedTargetRows[releasedKey] = []string{}
}
}
// now fill out all signers on released keys
for _, tgt := range allTargets {
targetKey := trustTagKey{tgt.Target.Name, hex.EncodeToString(tgt.Target.Hashes[notary.SHA256])}
// only considered released targets
if _, ok := releasedTargetRows[targetKey]; ok && !isReleasedTarget(tgt.Role.Name) {
releasedTargetRows[targetKey] = append(releasedTargetRows[targetKey], notaryRoleToSigner(tgt.Role.Name))
}
}
// compile the final output as a sorted slice
for targetKey, signers := range releasedTargetRows {
signatureRows = append(signatureRows, trustTagRow{targetKey, signers})
}
sort.Sort(signatureRows)
return signatureRows
}