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package generator
import (
"encoding/json"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
"time"
tuf "github.com/theupdateframework/go-tuf"
"github.com/theupdateframework/go-tuf/data"
"github.com/theupdateframework/go-tuf/pkg/keys"
)
var expirationDate = time.Date(2100, time.January, 1, 0, 0, 0, 0, time.UTC)
type persistedKeys struct {
Encrypted bool `json:"encrypted"`
Data []*data.PrivateKey `json:"data"`
}
func assertNoError(err error) {
if err != nil {
panic(fmt.Sprintf("assertion failed: %s", err))
}
}
// copyRepo recursively copies all regular files and directories under src
// to dst. In the case where any destination file/directory exists
// (including dst itself), an error is returned.
func copyRepo(src string, dst string) error {
copyToDest := func(path string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
rel, err := filepath.Rel(src, path)
if err != nil {
return err
}
target := filepath.Join(dst, rel)
mode := info.Mode()
if mode.IsDir() {
return os.Mkdir(target, mode.Perm())
} else if mode.IsRegular() {
sfile, err := os.Open(path)
if err != nil {
return err
}
defer sfile.Close()
dfile, err := os.OpenFile(target, os.O_WRONLY|os.O_CREATE|os.O_EXCL, mode.Perm())
if err != nil {
return err
}
defer dfile.Close()
if _, err := io.Copy(dfile, sfile); err != nil {
return err
}
return nil
}
return fmt.Errorf("unknown mode %v", mode)
}
return filepath.Walk(src, copyToDest)
}
func newRepo(dir string) *tuf.Repo {
repo, err := tuf.NewRepoIndent(tuf.FileSystemStore(dir, nil), "", "\t")
assertNoError(err)
return repo
}
func commit(dir string, repo *tuf.Repo) {
assertNoError(repo.SnapshotWithExpires(expirationDate))
assertNoError(repo.TimestampWithExpires(expirationDate))
assertNoError(repo.Commit())
// Remove the keys directory to make sure we don't accidentally use a key.
assertNoError(os.RemoveAll(filepath.Join(dir, "keys")))
}
func addKeys(repo *tuf.Repo, roleKeys map[string][]*data.PrivateKey) {
for role, keyList := range roleKeys {
for _, key := range keyList {
signer, err := keys.GetSigner(key)
assertNoError(err)
assertNoError(repo.AddPrivateKeyWithExpires(role, signer, expirationDate))
}
}
}
func addTargets(repo *tuf.Repo, dir string, files map[string][]byte) {
paths := []string{}
for file, data := range files {
path := filepath.Join(dir, "staged", "targets", file)
assertNoError(os.MkdirAll(filepath.Dir(path), 0755))
assertNoError(os.WriteFile(path, data, 0644))
paths = append(paths, file)
}
assertNoError(repo.AddTargetsWithExpires(paths, nil, expirationDate))
}
func revokeKeys(repo *tuf.Repo, role string, keyList []*data.PrivateKey) {
for _, key := range keyList {
signer, err := keys.GetSigner(key)
assertNoError(err)
assertNoError(repo.RevokeKeyWithExpires(role, signer.PublicData().IDs()[0], expirationDate))
}
}
func generateRepos(dir string, roleKeys map[string][][]*data.PrivateKey, consistentSnapshot bool) {
// Collect all the initial keys we'll use when creating repositories.
// We'll modify this to reflect rotated keys.
keys := map[string][]*data.PrivateKey{
"root": roleKeys["root"][0],
"targets": roleKeys["targets"][0],
"snapshot": roleKeys["snapshot"][0],
"timestamp": roleKeys["timestamp"][0],
}
// Create the initial repo.
dir0 := filepath.Join(dir, "0")
repo0 := newRepo(dir0)
repo0.Init(consistentSnapshot)
addKeys(repo0, keys)
addTargets(repo0, dir0, map[string][]byte{"0": []byte("0")})
commit(dir0, repo0)
// Rotate all the keys to make sure that works.
oldDir := dir0
i := 1
for _, role := range []string{"root", "targets", "snapshot", "timestamp"} {
// Setup the repo.
stepName := fmt.Sprintf("%d", i)
d := filepath.Join(dir, stepName)
assertNoError(copyRepo(oldDir, d))
repo := newRepo(d)
addKeys(repo, keys)
// Actually rotate the keys
revokeKeys(repo, role, roleKeys[role][0])
addKeys(repo, map[string][]*data.PrivateKey{
role: roleKeys[role][1],
})
keys[role] = roleKeys[role][1]
// Add a target to make sure that works, then commit.
addTargets(repo, d, map[string][]byte{stepName: []byte(stepName)})
commit(d, repo)
i += 1
oldDir = d
}
// Add another target file to make sure the workflow worked.
stepName := fmt.Sprintf("%d", i)
d := filepath.Join(dir, stepName)
assertNoError(copyRepo(oldDir, d))
repo := newRepo(d)
addKeys(repo, keys)
addTargets(repo, d, map[string][]byte{stepName: []byte(stepName)})
commit(d, repo)
}
func Generate(dir string, keysPath string, consistentSnapshot bool) {
f, err := os.Open(keysPath)
assertNoError(err)
var roleKeys map[string][][]*data.PrivateKey
assertNoError(json.NewDecoder(f).Decode(&roleKeys))
log.Printf("generating %s", dir)
generateRepos(dir, roleKeys, consistentSnapshot)
}
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