package tunnel import ( "encoding/json" "fmt" "os" "strings" "github.com/google/uuid" "github.com/pkg/errors" "github.com/urfave/cli/v2" "github.com/cloudflare/cloudflared/certutil" "github.com/cloudflare/cloudflared/connection" "github.com/cloudflare/cloudflared/logger" "github.com/cloudflare/cloudflared/tunnelstore" ) type errInvalidJSONCredential struct { err error path string } func (e errInvalidJSONCredential) Error() string { return "Invalid JSON when parsing tunnel credentials file" } // subcommandContext carries structs shared between subcommands, to reduce number of arguments needed to // pass between subcommands, and make sure they are only initialized once type subcommandContext struct { c *cli.Context logger logger.Service isUIEnabled bool fs fileSystem // These fields should be accessed using their respective Getter tunnelstoreClient tunnelstore.Client userCredential *userCredential } func newSubcommandContext(c *cli.Context) (*subcommandContext, error) { isUIEnabled := c.IsSet(uiFlag) && c.String("name") != "" // If UI is enabled, terminal log output should be disabled -- log should be written into a UI log window instead logger, err := logger.CreateLoggerFromContext(c, isUIEnabled) if err != nil { return nil, errors.Wrap(err, "error setting up logger") } return &subcommandContext{ c: c, logger: logger, isUIEnabled: isUIEnabled, fs: realFileSystem{}, }, nil } // Returns something that can find the given tunnel's credentials file. func (sc *subcommandContext) credentialFinder(tunnelID uuid.UUID) CredFinder { if path := sc.c.String(CredFileFlag); path != "" { return newStaticPath(path, sc.fs) } return newSearchByID(tunnelID, sc.c, sc.logger, sc.fs) } type userCredential struct { cert *certutil.OriginCert certPath string } func (sc *subcommandContext) client() (tunnelstore.Client, error) { if sc.tunnelstoreClient != nil { return sc.tunnelstoreClient, nil } credential, err := sc.credential() if err != nil { return nil, err } userAgent := fmt.Sprintf("cloudflared/%s", version) client, err := tunnelstore.NewRESTClient(sc.c.String("api-url"), credential.cert.AccountID, credential.cert.ZoneID, credential.cert.ServiceKey, userAgent, sc.logger) if err != nil { return nil, err } sc.tunnelstoreClient = client return client, nil } func (sc *subcommandContext) credential() (*userCredential, error) { if sc.userCredential == nil { originCertPath, err := findOriginCert(sc.c, sc.logger) if err != nil { return nil, errors.Wrap(err, "Error locating origin cert") } blocks, err := readOriginCert(originCertPath, sc.logger) if err != nil { return nil, errors.Wrapf(err, "Can't read origin cert from %s", originCertPath) } cert, err := certutil.DecodeOriginCert(blocks) if err != nil { return nil, errors.Wrap(err, "Error decoding origin cert") } if cert.AccountID == "" { return nil, errors.Errorf(`Origin certificate needs to be refreshed before creating new tunnels.\nDelete %s and run "cloudflared login" to obtain a new cert.`, originCertPath) } sc.userCredential = &userCredential{ cert: cert, certPath: originCertPath, } } return sc.userCredential, nil } func (sc *subcommandContext) readTunnelCredentials(credFinder CredFinder) (connection.Credentials, error) { filePath, err := credFinder.Path() if err != nil { return connection.Credentials{}, err } body, err := sc.fs.readFile(filePath) if err != nil { return connection.Credentials{}, errors.Wrapf(err, "couldn't read tunnel credentials from %v", filePath) } var credentials connection.Credentials if err = json.Unmarshal(body, &credentials); err != nil { if strings.HasSuffix(filePath, ".pem") { return connection.Credentials{}, fmt.Errorf("The tunnel credentials file should be .json but you gave a .pem. " + "The tunnel credentials file was originally created by `cloudflared tunnel create`. " + "You may have accidentally used the filepath to cert.pem, which is generated by `cloudflared tunnel " + "login`.") } return connection.Credentials{}, errInvalidJSONCredential{path: filePath, err: err} } return credentials, nil } func (sc *subcommandContext) create(name string) (*tunnelstore.Tunnel, error) { client, err := sc.client() if err != nil { return nil, errors.Wrap(err, "couldn't create client to talk to Argo Tunnel backend") } tunnelSecret, err := generateTunnelSecret() if err != nil { return nil, errors.Wrap(err, "couldn't generate the secret for your new tunnel") } tunnel, err := client.CreateTunnel(name, tunnelSecret) if err != nil { return nil, errors.Wrap(err, "Create Tunnel API call failed") } credential, err := sc.credential() if err != nil { return nil, err } tunnelCredentials := connection.Credentials{ AccountTag: credential.cert.AccountID, TunnelSecret: tunnelSecret, TunnelID: tunnel.ID, TunnelName: name, } filePath, writeFileErr := writeTunnelCredentials(credential.certPath, &tunnelCredentials) if err != nil { var errorLines []string errorLines = append(errorLines, fmt.Sprintf("Your tunnel '%v' was created with ID %v. However, cloudflared couldn't write to the tunnel credentials file at %v.json.", tunnel.Name, tunnel.ID, tunnel.ID)) errorLines = append(errorLines, fmt.Sprintf("The file-writing error is: %v", writeFileErr)) if deleteErr := client.DeleteTunnel(tunnel.ID); deleteErr != nil { errorLines = append(errorLines, fmt.Sprintf("Cloudflared tried to delete the tunnel for you, but encountered an error. You should use `cloudflared tunnel delete %v` to delete the tunnel yourself, because the tunnel can't be run without the tunnelfile.", tunnel.ID)) errorLines = append(errorLines, fmt.Sprintf("The delete tunnel error is: %v", deleteErr)) } else { errorLines = append(errorLines, fmt.Sprintf("The tunnel was deleted, because the tunnel can't be run without the tunnelfile")) } errorMsg := strings.Join(errorLines, "\n") return nil, errors.New(errorMsg) } sc.logger.Infof("Tunnel credentials written to %v. cloudflared chose this file based on where your origin certificate was found. Keep this file secret. To revoke these credentials, delete the tunnel.", filePath) if outputFormat := sc.c.String(outputFormatFlag.Name); outputFormat != "" { return nil, renderOutput(outputFormat, &tunnel) } sc.logger.Infof("Created tunnel %s with id %s", tunnel.Name, tunnel.ID) return tunnel, nil } func (sc *subcommandContext) list(filter *tunnelstore.Filter) ([]*tunnelstore.Tunnel, error) { client, err := sc.client() if err != nil { return nil, err } return client.ListTunnels(filter) } func (sc *subcommandContext) delete(tunnelIDs []uuid.UUID) error { forceFlagSet := sc.c.Bool("force") client, err := sc.client() if err != nil { return err } for _, id := range tunnelIDs { tunnel, err := client.GetTunnel(id) if err != nil { return errors.Wrapf(err, "Can't get tunnel information. Please check tunnel id: %s", tunnel.ID) } // Check if tunnel DeletedAt field has already been set if !tunnel.DeletedAt.IsZero() { return fmt.Errorf("Tunnel %s has already been deleted", tunnel.ID) } // Check if tunnel has existing connections and if force flag is set, cleanup connections if len(tunnel.Connections) > 0 { if !forceFlagSet { return fmt.Errorf("You can not delete tunnel %s because it has active connections. To see connections run the 'list' command. If you believe the tunnel is not active, you can use a -f / --force flag with this command.", id) } if err := client.CleanupConnections(tunnel.ID); err != nil { return errors.Wrapf(err, "Error cleaning up connections for tunnel %s", tunnel.ID) } } if err := client.DeleteTunnel(tunnel.ID); err != nil { return errors.Wrapf(err, "Error deleting tunnel %s", tunnel.ID) } credFinder := sc.credentialFinder(id) if tunnelCredentialsPath, err := credFinder.Path(); err == nil { if err = os.Remove(tunnelCredentialsPath); err != nil { sc.logger.Infof("Tunnel %v was deleted, but we could not remove its credentials file %s: %s. Consider deleting this file manually.", id, tunnelCredentialsPath, err) } } } return nil } // findCredentials will choose the right way to find the credentials file, find it, // and add the TunnelID into any old credentials (generated before TUN-3581 added the `TunnelID` // field to credentials files) func (sc *subcommandContext) findCredentials(tunnelID uuid.UUID) (connection.Credentials, error) { credFinder := sc.credentialFinder(tunnelID) credentials, err := sc.readTunnelCredentials(credFinder) // This line ensures backwards compatibility with credentials files generated before // TUN-3581. Those old credentials files don't have a TunnelID field, so we enrich the struct // with the ID, which we have already resolved from the user input. credentials.TunnelID = tunnelID return credentials, err } func (sc *subcommandContext) run(tunnelID uuid.UUID) error { credentials, err := sc.findCredentials(tunnelID) if err != nil { if e, ok := err.(errInvalidJSONCredential); ok { sc.logger.Errorf("The credentials file at %s contained invalid JSON. This is probably caused by passing the wrong filepath. Reminder: the credentials file is a .json file created via `cloudflared tunnel create`.", e.path) sc.logger.Errorf("Invalid JSON when parsing credentials file: %s", e.err.Error()) } return err } return StartServer( sc.c, version, shutdownC, graceShutdownC, &connection.NamedTunnelConfig{Credentials: credentials}, sc.logger, sc.isUIEnabled, ) } func (sc *subcommandContext) cleanupConnections(tunnelIDs []uuid.UUID) error { client, err := sc.client() if err != nil { return err } for _, tunnelID := range tunnelIDs { sc.logger.Infof("Cleanup connection for tunnel %s", tunnelID) if err := client.CleanupConnections(tunnelID); err != nil { sc.logger.Errorf("Error cleaning up connections for tunnel %v, error :%v", tunnelID, err) } } return nil } func (sc *subcommandContext) route(tunnelID uuid.UUID, r tunnelstore.Route) (tunnelstore.RouteResult, error) { client, err := sc.client() if err != nil { return nil, err } return client.RouteTunnel(tunnelID, r) } // Query Tunnelstore to find the active tunnel with the given name. func (sc *subcommandContext) tunnelActive(name string) (*tunnelstore.Tunnel, bool, error) { filter := tunnelstore.NewFilter() filter.NoDeleted() filter.ByName(name) tunnels, err := sc.list(filter) if err != nil { return nil, false, err } if len(tunnels) == 0 { return nil, false, nil } // There should only be 1 active tunnel for a given name return tunnels[0], true, nil } // findID parses the input. If it's a UUID, return the UUID. // Otherwise, assume it's a name, and look up the ID of that tunnel. func (sc *subcommandContext) findID(input string) (uuid.UUID, error) { if u, err := uuid.Parse(input); err == nil { return u, nil } // Look up name in the credentials file. credFinder := newStaticPath(sc.c.String(CredFileFlag), sc.fs) if credentials, err := sc.readTunnelCredentials(credFinder); err == nil { if credentials.TunnelID != uuid.Nil && input == credentials.TunnelName { return credentials.TunnelID, nil } } // Fall back to querying Tunnelstore. if tunnel, found, err := sc.tunnelActive(input); err != nil { return uuid.Nil, err } else if found { return tunnel.ID, nil } return uuid.Nil, fmt.Errorf("%s is neither the ID nor the name of any of your tunnels", input) } // findIDs is just like mapping `findID` over a slice, but it only uses // one Tunnelstore API call. func (sc *subcommandContext) findIDs(inputs []string) ([]uuid.UUID, error) { // First, look up all tunnels the user has filter := tunnelstore.NewFilter() filter.NoDeleted() tunnels, err := sc.list(filter) if err != nil { return nil, err } // Do the pure list-processing in its own function, so that it can be // unit tested easily. return findIDs(tunnels, inputs) } func findIDs(tunnels []*tunnelstore.Tunnel, inputs []string) ([]uuid.UUID, error) { // Put them into a dictionary for faster lookups nameToID := make(map[string]uuid.UUID, len(tunnels)) for _, tunnel := range tunnels { nameToID[tunnel.Name] = tunnel.ID } // For each input, try to find the tunnel ID. tunnelIDs := make([]uuid.UUID, len(inputs)) var badInputs []string for i, input := range inputs { if id, err := uuid.Parse(input); err == nil { tunnelIDs[i] = id } else if id, ok := nameToID[input]; ok { tunnelIDs[i] = id } else { badInputs = append(badInputs, input) } } if len(badInputs) > 0 { msg := "Please specify either the ID or name of a tunnel. The following inputs were neither: %s" return nil, fmt.Errorf(msg, strings.Join(badInputs, ", ")) } return tunnelIDs, nil }