package trust import ( "encoding/json" "fmt" "net" "net/http" "net/url" "os" "path" "path/filepath" "time" "github.com/Sirupsen/logrus" "github.com/docker/distribution/registry/client/auth" "github.com/docker/distribution/registry/client/auth/challenge" "github.com/docker/distribution/registry/client/transport" "github.com/docker/docker/api/types" registrytypes "github.com/docker/docker/api/types/registry" "github.com/docker/docker/cli/command" cliconfig "github.com/docker/docker/cli/config" "github.com/docker/docker/registry" "github.com/docker/go-connections/tlsconfig" "github.com/docker/notary" "github.com/docker/notary/client" "github.com/docker/notary/passphrase" "github.com/docker/notary/storage" "github.com/docker/notary/trustmanager" "github.com/docker/notary/trustpinning" "github.com/docker/notary/tuf/data" "github.com/docker/notary/tuf/signed" ) var ( // ReleasesRole is the role named "releases" ReleasesRole = path.Join(data.CanonicalTargetsRole, "releases") ) func trustDirectory() string { return filepath.Join(cliconfig.Dir(), "trust") } // certificateDirectory returns the directory containing // TLS certificates for the given server. An error is // returned if there was an error parsing the server string. func certificateDirectory(server string) (string, error) { u, err := url.Parse(server) if err != nil { return "", err } return filepath.Join(cliconfig.Dir(), "tls", u.Host), nil } // Server returns the base URL for the trust server. func Server(index *registrytypes.IndexInfo) (string, error) { if s := os.Getenv("DOCKER_CONTENT_TRUST_SERVER"); s != "" { urlObj, err := url.Parse(s) if err != nil || urlObj.Scheme != "https" { return "", fmt.Errorf("valid https URL required for trust server, got %s", s) } return s, nil } if index.Official { return registry.NotaryServer, nil } return "https://" + index.Name, nil } type simpleCredentialStore struct { auth types.AuthConfig } func (scs simpleCredentialStore) Basic(u *url.URL) (string, string) { return scs.auth.Username, scs.auth.Password } func (scs simpleCredentialStore) RefreshToken(u *url.URL, service string) string { return scs.auth.IdentityToken } func (scs simpleCredentialStore) SetRefreshToken(*url.URL, string, string) { } // GetNotaryRepository returns a NotaryRepository which stores all the // information needed to operate on a notary repository. // It creates an HTTP transport providing authentication support. func GetNotaryRepository(streams command.Streams, repoInfo *registry.RepositoryInfo, authConfig types.AuthConfig, actions ...string) (*client.NotaryRepository, error) { server, err := Server(repoInfo.Index) if err != nil { return nil, err } var cfg = tlsconfig.ClientDefault() cfg.InsecureSkipVerify = !repoInfo.Index.Secure // Get certificate base directory certDir, err := certificateDirectory(server) if err != nil { return nil, err } logrus.Debugf("reading certificate directory: %s", certDir) if err := registry.ReadCertsDirectory(cfg, certDir); err != nil { return nil, err } base := &http.Transport{ Proxy: http.ProxyFromEnvironment, Dial: (&net.Dialer{ Timeout: 30 * time.Second, KeepAlive: 30 * time.Second, DualStack: true, }).Dial, TLSHandshakeTimeout: 10 * time.Second, TLSClientConfig: cfg, DisableKeepAlives: true, } // Skip configuration headers since request is not going to Docker daemon modifiers := registry.DockerHeaders(command.UserAgent(), http.Header{}) authTransport := transport.NewTransport(base, modifiers...) pingClient := &http.Client{ Transport: authTransport, Timeout: 5 * time.Second, } endpointStr := server + "/v2/" req, err := http.NewRequest("GET", endpointStr, nil) if err != nil { return nil, err } challengeManager := challenge.NewSimpleManager() resp, err := pingClient.Do(req) if err != nil { // Ignore error on ping to operate in offline mode logrus.Debugf("Error pinging notary server %q: %s", endpointStr, err) } else { defer resp.Body.Close() // Add response to the challenge manager to parse out // authentication header and register authentication method if err := challengeManager.AddResponse(resp); err != nil { return nil, err } } scope := auth.RepositoryScope{ Repository: repoInfo.FullName(), Actions: actions, Class: repoInfo.Class, } creds := simpleCredentialStore{auth: authConfig} tokenHandlerOptions := auth.TokenHandlerOptions{ Transport: authTransport, Credentials: creds, Scopes: []auth.Scope{scope}, ClientID: registry.AuthClientID, } tokenHandler := auth.NewTokenHandlerWithOptions(tokenHandlerOptions) basicHandler := auth.NewBasicHandler(creds) modifiers = append(modifiers, transport.RequestModifier(auth.NewAuthorizer(challengeManager, tokenHandler, basicHandler))) tr := transport.NewTransport(base, modifiers...) return client.NewNotaryRepository( trustDirectory(), repoInfo.FullName(), server, tr, getPassphraseRetriever(streams), trustpinning.TrustPinConfig{}) } func getPassphraseRetriever(streams command.Streams) notary.PassRetriever { aliasMap := map[string]string{ "root": "root", "snapshot": "repository", "targets": "repository", "default": "repository", } baseRetriever := passphrase.PromptRetrieverWithInOut(streams.In(), streams.Out(), aliasMap) env := map[string]string{ "root": os.Getenv("DOCKER_CONTENT_TRUST_ROOT_PASSPHRASE"), "snapshot": os.Getenv("DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE"), "targets": os.Getenv("DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE"), "default": os.Getenv("DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE"), } return func(keyName string, alias string, createNew bool, numAttempts int) (string, bool, error) { if v := env[alias]; v != "" { return v, numAttempts > 1, nil } // For non-root roles, we can also try the "default" alias if it is specified if v := env["default"]; v != "" && alias != data.CanonicalRootRole { return v, numAttempts > 1, nil } return baseRetriever(keyName, alias, createNew, numAttempts) } } // NotaryError formats an error message received from the notary service func NotaryError(repoName string, err error) error { switch err.(type) { case *json.SyntaxError: logrus.Debugf("Notary syntax error: %s", err) return fmt.Errorf("Error: no trust data available for remote repository %s. Try running notary server and setting DOCKER_CONTENT_TRUST_SERVER to its HTTPS address?", repoName) case signed.ErrExpired: return fmt.Errorf("Error: remote repository %s out-of-date: %v", repoName, err) case trustmanager.ErrKeyNotFound: return fmt.Errorf("Error: signing keys for remote repository %s not found: %v", repoName, err) case storage.NetworkError: return fmt.Errorf("Error: error contacting notary server: %v", err) case storage.ErrMetaNotFound: return fmt.Errorf("Error: trust data missing for remote repository %s or remote repository not found: %v", repoName, err) case trustpinning.ErrRootRotationFail, trustpinning.ErrValidationFail, signed.ErrInvalidKeyType: return fmt.Errorf("Warning: potential malicious behavior - trust data mismatch for remote repository %s: %v", repoName, err) case signed.ErrNoKeys: return fmt.Errorf("Error: could not find signing keys for remote repository %s, or could not decrypt signing key: %v", repoName, err) case signed.ErrLowVersion: return fmt.Errorf("Warning: potential malicious behavior - trust data version is lower than expected for remote repository %s: %v", repoName, err) case signed.ErrRoleThreshold: return fmt.Errorf("Warning: potential malicious behavior - trust data has insufficient signatures for remote repository %s: %v", repoName, err) case client.ErrRepositoryNotExist: return fmt.Errorf("Error: remote trust data does not exist for %s: %v", repoName, err) case signed.ErrInsufficientSignatures: return fmt.Errorf("Error: could not produce valid signature for %s. If Yubikey was used, was touch input provided?: %v", repoName, err) } return err }