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

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package tunnel
import (
"encoding/base64"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/urfave/cli/v2"
"github.com/cloudflare/cloudflared/cfapi"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/credentials"
"github.com/cloudflare/cloudflared/logger"
)
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 {
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c *cli.Context
log *zerolog.Logger
fs fileSystem
// These fields should be accessed using their respective Getter
tunnelstoreClient cfapi.Client
userCredential *credentials.User
}
func newSubcommandContext(c *cli.Context) (*subcommandContext, error) {
return &subcommandContext{
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c: c,
log: logger.CreateLoggerFromContext(c, logger.EnableTerminalLog),
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)
}
func (sc *subcommandContext) client() (cfapi.Client, error) {
if sc.tunnelstoreClient != nil {
return sc.tunnelstoreClient, nil
}
cred, err := sc.credential()
if err != nil {
return nil, err
}
sc.tunnelstoreClient, err = cred.Client(sc.c.String("api-url"), buildInfo.UserAgent(), sc.log)
if err != nil {
return nil, err
}
return sc.tunnelstoreClient, nil
}
func (sc *subcommandContext) credential() (*credentials.User, error) {
if sc.userCredential == nil {
uc, err := credentials.Read(sc.c.String(credentials.OriginCertFlag), sc.log)
if err != nil {
return nil, err
}
sc.userCredential = uc
}
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, credentialsFilePath string, secret string) (*cfapi.Tunnel, error) {
client, err := sc.client()
if err != nil {
return nil, errors.Wrap(err, "couldn't create client to talk to Cloudflare Tunnel backend")
}
var tunnelSecret []byte
if secret == "" {
tunnelSecret, err = generateTunnelSecret()
if err != nil {
return nil, errors.Wrap(err, "couldn't generate the secret for your new tunnel")
}
} else {
decodedSecret, err := base64.StdEncoding.DecodeString(secret)
if err != nil {
return nil, errors.Wrap(err, "Couldn't decode tunnel secret from base64")
}
tunnelSecret = []byte(decodedSecret)
if len(tunnelSecret) < 32 {
return nil, errors.New("Decoded tunnel secret must be at least 32 bytes long")
}
}
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.AccountID(),
TunnelSecret: tunnelSecret,
TunnelID: tunnel.ID,
}
usedCertPath := false
if credentialsFilePath == "" {
originCertDir := filepath.Dir(credential.CertPath())
credentialsFilePath, err = tunnelFilePath(tunnelCredentials.TunnelID, originCertDir)
if err != nil {
return nil, err
}
usedCertPath = true
}
writeFileErr := writeTunnelCredentials(credentialsFilePath, &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 tunnel credentials to %s.", tunnel.Name, tunnel.ID, credentialsFilePath))
errorLines = append(errorLines, fmt.Sprintf("The file-writing error is: %v", writeFileErr))
if deleteErr := client.DeleteTunnel(tunnel.ID, true); 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 credentials file"))
}
errorMsg := strings.Join(errorLines, "\n")
return nil, errors.New(errorMsg)
}
if outputFormat := sc.c.String(outputFormatFlag.Name); outputFormat != "" {
return nil, renderOutput(outputFormat, &tunnel)
}
fmt.Printf("Tunnel credentials written to %v.", credentialsFilePath)
if usedCertPath {
fmt.Print(" cloudflared chose this file based on where your origin certificate was found.")
}
fmt.Println(" Keep this file secret. To revoke these credentials, delete the tunnel.")
fmt.Printf("\nCreated tunnel %s with id %s\n", tunnel.Name, tunnel.ID)
return &tunnel.Tunnel, nil
}
func (sc *subcommandContext) list(filter *cfapi.TunnelFilter) ([]*cfapi.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", 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)
}
if err := client.DeleteTunnel(tunnel.ID, forceFlagSet); 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) {
var credentials connection.Credentials
var err error
if credentialsContents := sc.c.String(CredContentsFlag); credentialsContents != "" {
if err = json.Unmarshal([]byte(credentialsContents), &credentials); err != nil {
err = errInvalidJSONCredential{path: "TUNNEL_CRED_CONTENTS", err: err}
}
} else {
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
}
return sc.runWithCredentials(credentials)
}
func (sc *subcommandContext) runWithCredentials(credentials connection.Credentials) error {
sc.log.Info().Str(LogFieldTunnelID, credentials.TunnelID.String()).Msg("Starting tunnel")
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return StartServer(
sc.c,
buildInfo,
&connection.NamedTunnelProperties{Credentials: credentials},
sc.log,
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)
}
func (sc *subcommandContext) cleanupConnections(tunnelIDs []uuid.UUID) error {
params := cfapi.NewCleanupParams()
extraLog := ""
if connector := sc.c.String("connector-id"); connector != "" {
connectorID, err := uuid.Parse(connector)
if err != nil {
return errors.Wrapf(err, "%s is not a valid client ID (must be a UUID)", connector)
}
params.ForClient(connectorID)
extraLog = fmt.Sprintf(" for connector-id %s", connectorID.String())
}
client, err := sc.client()
if err != nil {
return err
}
for _, tunnelID := range tunnelIDs {
sc.log.Info().Msgf("Cleanup connection for tunnel %s%s", tunnelID, extraLog)
if err := client.CleanupConnections(tunnelID, params); err != nil {
sc.log.Error().Msgf("Error cleaning up connections for tunnel %v, error :%v", tunnelID, err)
}
}
return nil
}
func (sc *subcommandContext) getTunnelTokenCredentials(tunnelID uuid.UUID) (*connection.TunnelToken, error) {
client, err := sc.client()
if err != nil {
return nil, err
}
token, err := client.GetTunnelToken(tunnelID)
if err != nil {
sc.log.Err(err).Msgf("Could not get the Token for the given Tunnel %v", tunnelID)
return nil, err
}
return ParseToken(token)
}
func (sc *subcommandContext) route(tunnelID uuid.UUID, r cfapi.HostnameRoute) (cfapi.HostnameRouteResult, 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) (*cfapi.Tunnel, bool, error) {
filter := cfapi.NewTunnelFilter()
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 {
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 per non-UUID input provided.
func (sc *subcommandContext) findIDs(inputs []string) ([]uuid.UUID, error) {
uuids, names := splitUuids(inputs)
for _, name := range names {
filter := cfapi.NewTunnelFilter()
filter.NoDeleted()
filter.ByName(name)
tunnels, err := sc.list(filter)
if err != nil {
return nil, err
}
if len(tunnels) != 1 {
return nil, fmt.Errorf("there should only be 1 non-deleted Tunnel named %s", name)
}
uuids = append(uuids, tunnels[0].ID)
}
return uuids, nil
}
func splitUuids(inputs []string) ([]uuid.UUID, []string) {
uuids := make([]uuid.UUID, 0)
names := make([]string, 0)
for _, input := range inputs {
id, err := uuid.Parse(input)
if err != nil {
names = append(names, input)
} else {
uuids = append(uuids, id)
}
}
return uuids, names
}