cloudflared-mirror/cmd/cloudflared/tunnel/subcommand_context.go

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package tunnel
import (
"encoding/json"
"fmt"
"os"
"strings"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"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"
}
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// 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
log *zerolog.Logger
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) {
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isUIEnabled := c.IsSet(uiFlag) && c.String("name") != ""
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// If UI is enabled, terminal log output should be disabled -- log should be written into a UI log window instead
log := logger.CreateLoggerFromContext(c, isUIEnabled)
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return &subcommandContext{
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c: c,
log: log,
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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.log, 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.log,
)
if err != nil {
return nil, err
}
sc.tunnelstoreClient = client
return client, nil
}
func (sc *subcommandContext) credential() (*userCredential, error) {
if sc.userCredential == nil {
originCertPath := sc.c.String("origincert")
originCertLog := sc.log.With().
Str(LogFieldOriginCertPath, originCertPath).
Logger()
originCertPath, err := findOriginCert(originCertPath, &originCertLog)
if err != nil {
return nil, errors.Wrap(err, "Error locating origin cert")
}
blocks, err := readOriginCert(originCertPath)
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 writeFileErr != 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.log.Info().Msgf("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.log.Info().Msgf("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.log.Info().Msgf("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.log.Error().Msgf("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.log.Error().Msgf("Invalid JSON when parsing credentials file: %s", e.err.Error())
}
return err
}
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return StartServer(
sc.c,
version,
&connection.NamedTunnelConfig{Credentials: credentials},
sc.log,
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sc.isUIEnabled,
)
}
func (sc *subcommandContext) cleanupConnections(tunnelIDs []uuid.UUID) error {
client, err := sc.client()
if err != nil {
return err
}
for _, tunnelID := range tunnelIDs {
sc.log.Info().Msgf("Cleanup connection for tunnel %s", tunnelID)
if err := client.CleanupConnections(tunnelID); err != nil {
sc.log.Error().Msgf("Error cleaning up connections for tunnel %v, error :%v", tunnelID, err)
}
}
return nil
}
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func (sc *subcommandContext) route(tunnelID uuid.UUID, r tunnelstore.Route) (tunnelstore.RouteResult, error) {
client, err := sc.client()
if err != nil {
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return nil, err
}
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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
}