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token_verifier_jwt.go
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token_verifier_jwt.go
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package jwtverify
import (
"context"
"crypto/ecdsa"
"crypto/rsa"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"regexp"
"strings"
"sync"
"time"
"github.com/centrifugal/centrifugo/v5/internal/jwks"
"github.com/centrifugal/centrifugo/v5/internal/rule"
"github.com/centrifugal/centrifugo/v5/internal/subsource"
"github.com/centrifugal/centrifuge"
"github.com/cristalhq/jwt/v5"
"github.com/rakutentech/jwk-go/okp"
"github.com/rs/zerolog/log"
)
type VerifierConfig struct {
// HMACSecretKey is a secret key used to validate connection and subscription
// tokens generated using HMAC. Zero value means that HMAC tokens won't be allowed.
HMACSecretKey string
// RSAPublicKey is a public key used to validate connection and subscription
// tokens generated using RSA. Zero value means that RSA tokens won't be allowed.
RSAPublicKey *rsa.PublicKey
// ECDSAPublicKey is a public key used to validate connection and subscription
// tokens generated using ECDSA. Zero value means that ECDSA tokens won't be allowed.
ECDSAPublicKey *ecdsa.PublicKey
// JWKSPublicEndpoint is a public url used to validate connection and subscription
// tokens generated using rotating RSA public keys. Zero value means that JSON Web Key Sets
// extension won't be used.
JWKSPublicEndpoint string
// Audience when set will enable audience token check. See
// https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3.
Audience string
// AudienceRegex allows setting Audience in form of Go language regex pattern. Regex groups
// may be then used in constructing JWKSPublicEndpoint.
AudienceRegex string
// Issuer when set will enable a check that token issuer matches configured string.
// See https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.1.
Issuer string
// IssuerRegex allows setting Issuer in form of Go language regex pattern. Regex groups
// may be then used in constructing JWKSPublicEndpoint.
IssuerRegex string
}
func (c VerifierConfig) Validate() error {
if c.Audience != "" && c.AudienceRegex != "" {
return errors.New("can not use both token_audience and token_audience_regex, configure only one of them")
}
if c.Issuer != "" && c.IssuerRegex != "" {
return errors.New("can not use both token_issuer and token_issuer_regex, configure only one of them")
}
return nil
}
func NewTokenVerifierJWT(config VerifierConfig, ruleContainer *rule.Container) (*VerifierJWT, error) {
if err := config.Validate(); err != nil {
return nil, fmt.Errorf("error validating token verifier config: %w", err)
}
var audienceRe *regexp.Regexp
var issuerRe *regexp.Regexp
var err error
if config.AudienceRegex != "" {
audienceRe, err = regexp.Compile(config.AudienceRegex)
if err != nil {
return nil, fmt.Errorf("error compiling audience regex: %w", err)
}
}
if config.IssuerRegex != "" {
issuerRe, err = regexp.Compile(config.IssuerRegex)
if err != nil {
return nil, fmt.Errorf("error compiling issuer regex: %w", err)
}
}
verifier := &VerifierJWT{
ruleContainer: ruleContainer,
issuer: config.Issuer,
issuerRe: issuerRe,
audience: config.Audience,
audienceRe: audienceRe,
}
algorithms, err := newAlgorithms(config.HMACSecretKey, config.RSAPublicKey, config.ECDSAPublicKey)
if err != nil {
return nil, fmt.Errorf("error initializing token algorithms: %w", err)
}
verifier.algorithms = algorithms
if config.JWKSPublicEndpoint != "" {
mng, err := jwks.NewManager(config.JWKSPublicEndpoint)
if err != nil {
return nil, fmt.Errorf("error creating JWK manager: %w", err)
}
verifier.jwksManager = &jwksManager{mng}
}
return verifier, nil
}
type VerifierJWT struct {
mu sync.RWMutex
jwksManager *jwksManager
algorithms *algorithms
ruleContainer *rule.Container
audience string
audienceRe *regexp.Regexp
issuer string
issuerRe *regexp.Regexp
}
var (
ErrTokenExpired = errors.New("token expired")
ErrInvalidToken = errors.New("invalid token")
errPublicKeyInvalid = errors.New("public key is invalid")
errUnsupportedAlgorithm = errors.New("unsupported JWT algorithm")
errDisabledAlgorithm = errors.New("disabled JWT algorithm")
)
// BoolValue allows override boolean option.
type BoolValue struct {
Value bool `json:"value,omitempty"`
}
// SubscribeOptionOverride to override configured behaviour of subscriptions.
type SubscribeOptionOverride struct {
// Presence turns on participating in channel presence.
Presence *BoolValue `json:"presence,omitempty"`
// JoinLeave enables sending Join and Leave messages for this client in channel.
JoinLeave *BoolValue `json:"join_leave,omitempty"`
// ForcePushJoinLeave forces sending join/leave for this client.
ForcePushJoinLeave *BoolValue `json:"force_push_join_leave,omitempty"`
// ForcePositioning on says that client will additionally sync its position inside
// a stream to prevent message loss. Make sure you are enabling ForcePositioning in channels
// that maintain Publication history stream. When ForcePositioning is on Centrifuge will
// include StreamPosition information to subscribe response - for a client to be able
// to manually track its position inside a stream.
ForcePositioning *BoolValue `json:"force_positioning,omitempty"`
// ForceRecovery turns on recovery option for a channel. In this case client will try to
// recover missed messages automatically upon resubscribe to a channel after reconnect
// to a server. This option also enables client position tracking inside a stream
// (like ForcePositioning option) to prevent occasional message loss. Make sure you are using
// ForceRecovery in channels that maintain Publication history stream.
ForceRecovery *BoolValue `json:"force_recovery,omitempty"`
}
// SubscribeOptions define per-subscription options.
type SubscribeOptions struct {
// Info defines custom channel information, zero value means no channel information.
Info json.RawMessage `json:"info,omitempty"`
// Base64Info is like Info but for binary.
Base64Info string `json:"b64info,omitempty"`
// Data to send to a client with Subscribe Push.
Data json.RawMessage `json:"data,omitempty"`
// Base64Data is like Data but for binary data.
Base64Data string `json:"b64data,omitempty"`
// Override channel options can contain channel options overrides.
Override *SubscribeOptionOverride `json:"override,omitempty"`
}
type ConnectTokenClaims struct {
ExpireAt *int64 `json:"expire_at,omitempty"`
Info json.RawMessage `json:"info,omitempty"`
Base64Info string `json:"b64info,omitempty"`
Channels []string `json:"channels,omitempty"`
Subs map[string]SubscribeOptions `json:"subs,omitempty"`
Meta json.RawMessage `json:"meta,omitempty"`
// Channel must never be set in connection tokens. We check this on verifying.
Channel string `json:"channel,omitempty"`
jwt.RegisteredClaims
}
type SubscribeTokenClaims struct {
jwt.RegisteredClaims
SubscribeOptions
Channel string `json:"channel,omitempty"`
Client string `json:"client,omitempty"`
ExpireAt *int64 `json:"expire_at,omitempty"`
}
type jwksManager struct{ *jwks.Manager }
func (j *jwksManager) verify(token *jwt.Token, tokenVars map[string]any) error {
kid := token.Header().KeyID
key, err := j.Manager.FetchKey(context.Background(), kid, tokenVars)
if err != nil {
return err
}
if key.Kty != "RSA" && key.Kty != "EC" && key.Kty != "OKP" {
return errUnsupportedAlgorithm
}
spec, err := key.ParseKeySpec()
if err != nil {
return fmt.Errorf("error parsing key spec: %w", err)
}
switch key.Kty {
case "RSA":
pubKey, ok := spec.Key.(*rsa.PublicKey)
if !ok {
return errPublicKeyInvalid
}
verifier, err := jwt.NewVerifierRS(jwt.Algorithm(spec.Algorithm), pubKey)
if err != nil {
return fmt.Errorf("%w: %s", errUnsupportedAlgorithm, spec.Algorithm)
}
return verifier.Verify(token)
case "EC":
pubKey, ok := spec.Key.(*ecdsa.PublicKey)
if !ok {
return errPublicKeyInvalid
}
verifier, err := jwt.NewVerifierES(jwt.Algorithm(spec.Algorithm), pubKey)
if err != nil {
return fmt.Errorf("%w: %s", errUnsupportedAlgorithm, spec.Algorithm)
}
return verifier.Verify(token)
case "OKP":
pubKey, ok := spec.Key.(okp.Ed25519)
if !ok {
return errPublicKeyInvalid
}
verifier, err := jwt.NewVerifierEdDSA(pubKey.PublicKey())
if err != nil {
return errUnsupportedAlgorithm
}
return verifier.Verify(token)
default:
return errUnsupportedAlgorithm
}
}
type algorithms struct {
HS256 jwt.Verifier
HS384 jwt.Verifier
HS512 jwt.Verifier
RS256 jwt.Verifier
RS384 jwt.Verifier
RS512 jwt.Verifier
ES256 jwt.Verifier
ES384 jwt.Verifier
ES512 jwt.Verifier
}
func newAlgorithms(tokenHMACSecretKey string, rsaPubKey *rsa.PublicKey, ecdsaPubKey *ecdsa.PublicKey) (*algorithms, error) {
alg := &algorithms{}
var algorithms []string
// HMAC SHA.
if tokenHMACSecretKey != "" {
verifierHS256, err := jwt.NewVerifierHS(jwt.HS256, []byte(tokenHMACSecretKey))
if err != nil {
return nil, err
}
verifierHS384, err := jwt.NewVerifierHS(jwt.HS384, []byte(tokenHMACSecretKey))
if err != nil {
return nil, err
}
verifierHS512, err := jwt.NewVerifierHS(jwt.HS512, []byte(tokenHMACSecretKey))
if err != nil {
return nil, err
}
alg.HS256 = verifierHS256
alg.HS384 = verifierHS384
alg.HS512 = verifierHS512
algorithms = append(algorithms, []string{"HS256", "HS384", "HS512"}...)
}
// RSA.
if rsaPubKey != nil {
if verifierRS256, err := jwt.NewVerifierRS(jwt.RS256, rsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.RS256 = verifierRS256
algorithms = append(algorithms, "RS256")
}
if verifierRS384, err := jwt.NewVerifierRS(jwt.RS384, rsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.RS384 = verifierRS384
algorithms = append(algorithms, "RS384")
}
if verifierRS512, err := jwt.NewVerifierRS(jwt.RS512, rsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.RS512 = verifierRS512
algorithms = append(algorithms, "RS512")
}
}
// ECDSA.
if ecdsaPubKey != nil {
if verifierES256, err := jwt.NewVerifierES(jwt.ES256, ecdsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.ES256 = verifierES256
algorithms = append(algorithms, "ES256")
}
if verifierES384, err := jwt.NewVerifierES(jwt.ES384, ecdsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.ES384 = verifierES384
algorithms = append(algorithms, "ES384")
}
if verifierES512, err := jwt.NewVerifierES(jwt.ES512, ecdsaPubKey); err != nil {
if err != jwt.ErrInvalidKey {
return nil, err
}
} else {
alg.ES512 = verifierES512
algorithms = append(algorithms, "ES512")
}
}
if len(algorithms) > 0 {
log.Info().Str("algorithms", strings.Join(algorithms, ", ")).Msg("enabled JWT verifiers")
}
return alg, nil
}
func (s *algorithms) verify(token *jwt.Token) error {
var verifier jwt.Verifier
switch token.Header().Algorithm {
case jwt.HS256:
verifier = s.HS256
case jwt.HS384:
verifier = s.HS384
case jwt.HS512:
verifier = s.HS512
case jwt.RS256:
verifier = s.RS256
case jwt.RS384:
verifier = s.RS384
case jwt.RS512:
verifier = s.RS512
case jwt.ES256:
verifier = s.ES256
case jwt.ES384:
verifier = s.ES384
case jwt.ES512:
verifier = s.ES512
default:
return fmt.Errorf("%w: %s", errUnsupportedAlgorithm, string(token.Header().Algorithm))
}
if verifier == nil {
return fmt.Errorf("%w: %s", errDisabledAlgorithm, string(token.Header().Algorithm))
}
return verifier.Verify(token)
}
func (verifier *VerifierJWT) verifySignature(token *jwt.Token) error {
verifier.mu.RLock()
defer verifier.mu.RUnlock()
return verifier.algorithms.verify(token)
}
func (verifier *VerifierJWT) verifySignatureByJWK(token *jwt.Token, tokenVars map[string]any) error {
verifier.mu.RLock()
defer verifier.mu.RUnlock()
return verifier.jwksManager.verify(token, tokenVars)
}
func (verifier *VerifierJWT) VerifyConnectToken(t string, skipVerify bool) (ConnectToken, error) {
token, err := jwt.ParseNoVerify([]byte(t)) // Will be verified later.
if err != nil {
return ConnectToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
claims, err := claimsDecoder.DecodeConnectClaims(token.Claims())
if err != nil {
return ConnectToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
if verifier.audience != "" && !claims.IsForAudience(verifier.audience) {
return ConnectToken{}, ErrInvalidToken
}
if verifier.issuer != "" && !claims.IsIssuer(verifier.issuer) {
return ConnectToken{}, ErrInvalidToken
}
tokenVars := map[string]any{}
if verifier.issuerRe != nil {
match := verifier.issuerRe.FindStringSubmatch(claims.Issuer)
if len(match) == 0 {
return ConnectToken{}, ErrInvalidToken
}
for i, name := range verifier.issuerRe.SubexpNames() {
if i != 0 && name != "" {
tokenVars[name] = match[i]
}
}
}
if verifier.audienceRe != nil {
matched := false
for _, audience := range claims.Audience {
match := verifier.audienceRe.FindStringSubmatch(audience)
if len(match) == 0 {
continue
}
matched = true
for i, name := range verifier.audienceRe.SubexpNames() {
if i != 0 && name != "" {
tokenVars[name] = match[i]
}
}
break
}
if !matched {
return ConnectToken{}, ErrInvalidToken
}
}
if !skipVerify {
if verifier.jwksManager != nil {
err = verifier.verifySignatureByJWK(token, tokenVars)
} else {
err = verifier.verifySignature(token)
}
if err != nil {
return ConnectToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
}
if claims.Channel != "" {
return ConnectToken{}, fmt.Errorf(
"%w: connection JWT can not contain channel claim, only subscription JWT can", ErrInvalidToken)
}
now := time.Now()
if !claims.IsValidExpiresAt(now) || !claims.IsValidNotBefore(now) {
return ConnectToken{}, ErrTokenExpired
}
subs := map[string]centrifuge.SubscribeOptions{}
if len(claims.Subs) > 0 {
for ch, v := range claims.Subs {
_, _, chOpts, found, err := verifier.ruleContainer.ChannelOptions(ch)
if err != nil {
return ConnectToken{}, err
}
if !found {
return ConnectToken{}, centrifuge.ErrorUnknownChannel
}
var info []byte
if v.Base64Info != "" {
byteInfo, err := base64.StdEncoding.DecodeString(v.Base64Info)
if err != nil {
return ConnectToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
info = byteInfo
} else {
info = v.Info
}
var data []byte
if v.Base64Data != "" {
byteInfo, err := base64.StdEncoding.DecodeString(v.Base64Data)
if err != nil {
return ConnectToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
data = byteInfo
} else {
data = v.Data
}
presence := chOpts.Presence
if v.Override != nil && v.Override.Presence != nil {
presence = v.Override.Presence.Value
}
joinLeave := chOpts.JoinLeave
if v.Override != nil && v.Override.JoinLeave != nil {
joinLeave = v.Override.JoinLeave.Value
}
pushJoinLeave := chOpts.ForcePushJoinLeave
if v.Override != nil && v.Override.ForcePushJoinLeave != nil {
pushJoinLeave = v.Override.ForcePushJoinLeave.Value
}
recovery := chOpts.ForceRecovery
if v.Override != nil && v.Override.ForceRecovery != nil {
recovery = v.Override.ForceRecovery.Value
}
positioning := chOpts.ForcePositioning
if v.Override != nil && v.Override.ForcePositioning != nil {
positioning = v.Override.ForcePositioning.Value
}
subs[ch] = centrifuge.SubscribeOptions{
ChannelInfo: info,
EmitPresence: presence,
EmitJoinLeave: joinLeave,
PushJoinLeave: pushJoinLeave,
EnableRecovery: recovery,
EnablePositioning: positioning,
Data: data,
Source: subsource.ConnectionToken,
HistoryMetaTTL: time.Duration(chOpts.HistoryMetaTTL),
}
}
} else if len(claims.Channels) > 0 {
for _, ch := range claims.Channels {
_, _, chOpts, found, err := verifier.ruleContainer.ChannelOptions(ch)
if err != nil {
return ConnectToken{}, err
}
if !found {
return ConnectToken{}, centrifuge.ErrorUnknownChannel
}
subs[ch] = centrifuge.SubscribeOptions{
EmitPresence: chOpts.Presence,
EmitJoinLeave: chOpts.JoinLeave,
PushJoinLeave: chOpts.ForcePushJoinLeave,
EnableRecovery: chOpts.ForceRecovery,
EnablePositioning: chOpts.ForcePositioning,
Source: subsource.ConnectionToken,
HistoryMetaTTL: time.Duration(chOpts.HistoryMetaTTL),
}
}
}
var expireAt int64
if claims.ExpireAt != nil {
if *claims.ExpireAt > 0 {
expireAt = *claims.ExpireAt
}
} else {
if claims.ExpiresAt != nil {
expireAt = claims.ExpiresAt.Unix()
}
}
var info []byte
if claims.Base64Info != "" {
byteInfo, err := base64.StdEncoding.DecodeString(claims.Base64Info)
if err != nil {
return ConnectToken{}, err
}
info = byteInfo
} else {
info = claims.Info
}
ct := ConnectToken{
UserID: claims.RegisteredClaims.Subject,
Info: info,
Subs: subs,
ExpireAt: expireAt,
Meta: claims.Meta,
}
return ct, nil
}
func (verifier *VerifierJWT) VerifySubscribeToken(t string, skipVerify bool) (SubscribeToken, error) {
token, err := jwt.ParseNoVerify([]byte(t)) // Will be verified later.
if err != nil {
return SubscribeToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
claims, err := claimsDecoder.DecodeSubscribeClaims(token.Claims())
if err != nil {
return SubscribeToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
if verifier.audience != "" && !claims.IsForAudience(verifier.audience) {
return SubscribeToken{}, ErrInvalidToken
}
if verifier.issuer != "" && !claims.IsIssuer(verifier.issuer) {
return SubscribeToken{}, ErrInvalidToken
}
tokenVars := map[string]any{}
if verifier.issuerRe != nil {
match := verifier.issuerRe.FindStringSubmatch(claims.Issuer)
if len(match) == 0 {
return SubscribeToken{}, ErrInvalidToken
}
for i, name := range verifier.issuerRe.SubexpNames() {
if i != 0 && name != "" {
tokenVars[name] = match[i]
}
}
}
if verifier.audienceRe != nil {
matched := false
for _, audience := range claims.Audience {
match := verifier.audienceRe.FindStringSubmatch(audience)
if len(match) == 0 {
continue
}
matched = true
for i, name := range verifier.audienceRe.SubexpNames() {
if i != 0 && name != "" {
tokenVars[name] = match[i]
}
}
break
}
if !matched {
return SubscribeToken{}, ErrInvalidToken
}
}
if !skipVerify {
if verifier.jwksManager != nil {
err = verifier.verifySignatureByJWK(token, tokenVars)
} else {
err = verifier.verifySignature(token)
}
if err != nil {
return SubscribeToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
}
now := time.Now()
if !claims.IsValidExpiresAt(now) || !claims.IsValidNotBefore(now) {
return SubscribeToken{}, ErrTokenExpired
}
if claims.Channel == "" {
return SubscribeToken{}, ErrInvalidToken
}
_, _, chOpts, found, err := verifier.ruleContainer.ChannelOptions(claims.Channel)
if err != nil {
return SubscribeToken{}, err
}
if !found {
return SubscribeToken{}, centrifuge.ErrorUnknownChannel
}
var info []byte
if claims.Base64Info != "" {
byteInfo, err := base64.StdEncoding.DecodeString(claims.Base64Info)
if err != nil {
return SubscribeToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
info = byteInfo
} else {
info = claims.Info
}
var data []byte
if claims.Base64Data != "" {
byteInfo, err := base64.StdEncoding.DecodeString(claims.Base64Data)
if err != nil {
return SubscribeToken{}, fmt.Errorf("%w: %v", ErrInvalidToken, err)
}
data = byteInfo
} else {
data = claims.Data
}
presence := chOpts.Presence
if claims.Override != nil && claims.Override.Presence != nil {
presence = claims.Override.Presence.Value
}
joinLeave := chOpts.JoinLeave
if claims.Override != nil && claims.Override.JoinLeave != nil {
joinLeave = claims.Override.JoinLeave.Value
}
pushJoinLeave := chOpts.ForcePushJoinLeave
if claims.Override != nil && claims.Override.ForcePushJoinLeave != nil {
pushJoinLeave = claims.Override.ForcePushJoinLeave.Value
}
recovery := chOpts.ForceRecovery
if claims.Override != nil && claims.Override.ForceRecovery != nil {
recovery = claims.Override.ForceRecovery.Value
}
positioning := chOpts.ForcePositioning
if claims.Override != nil && claims.Override.ForcePositioning != nil {
positioning = claims.Override.ForcePositioning.Value
}
var expireAt int64
if claims.ExpireAt != nil {
if *claims.ExpireAt > 0 {
expireAt = *claims.ExpireAt
}
} else {
if claims.ExpiresAt != nil {
expireAt = claims.ExpiresAt.Unix()
}
}
st := SubscribeToken{
UserID: claims.RegisteredClaims.Subject,
Channel: claims.Channel,
Client: claims.Client,
Options: centrifuge.SubscribeOptions{
ExpireAt: expireAt,
ChannelInfo: info,
EmitPresence: presence,
EmitJoinLeave: joinLeave,
PushJoinLeave: pushJoinLeave,
EnableRecovery: recovery,
EnablePositioning: positioning,
Data: data,
},
}
return st, nil
}
func (verifier *VerifierJWT) Reload(config VerifierConfig) error {
if err := config.Validate(); err != nil {
return fmt.Errorf("error validating token verifier config: %w", err)
}
verifier.mu.Lock()
defer verifier.mu.Unlock()
alg, err := newAlgorithms(config.HMACSecretKey, config.RSAPublicKey, config.ECDSAPublicKey)
if err != nil {
return err
}
var audienceRe *regexp.Regexp
var issuerRe *regexp.Regexp
if config.AudienceRegex != "" {
audienceRe, err = regexp.Compile(config.AudienceRegex)
if err != nil {
return fmt.Errorf("error compiling audience regex: %w", err)
}
}
if config.IssuerRegex != "" {
issuerRe, err = regexp.Compile(config.IssuerRegex)
if err != nil {
return fmt.Errorf("error compiling issuer regex: %w", err)
}
}
verifier.algorithms = alg
verifier.audience = config.Audience
verifier.audienceRe = audienceRe
verifier.issuer = config.Issuer
verifier.issuerRe = issuerRe
return nil
}