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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "errors" | ||
| "flag" | ||
| "github.com/grepplabs/kafka-proxy/pkg/apis" | ||
| "github.com/grepplabs/kafka-proxy/pkg/libs/util" | ||
| "github.com/grepplabs/kafka-proxy/plugin/token-info/shared" | ||
| "github.com/hashicorp/go-plugin" | ||
| "github.com/sirupsen/logrus" | ||
| "os" | ||
| "strings" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| StatusOK = 0 | ||
| StatusEmptyToken = 1 | ||
| StatusParseJWTFailed = 2 | ||
| StatusWrongAlgorithm = 3 | ||
| StatusUnauthorized = 4 | ||
| StatusNoIssueTimeInToken = 5 | ||
| StatusNoExpirationTimeInToken = 6 | ||
| StatusTokenTooEarly = 7 | ||
| StatusTokenExpired = 8 | ||
|
|
||
| AlgorithmNone = "none" | ||
| ) | ||
|
|
||
| var ( | ||
| clockSkew = 1 * time.Minute | ||
| ) | ||
|
|
||
| type UnsecuredJWTVerifier struct { | ||
| claimSub map[string]struct{} | ||
| } | ||
|
|
||
| type pluginMeta struct { | ||
| claimSub util.ArrayFlags | ||
| } | ||
|
|
||
| func (f *pluginMeta) flagSet() *flag.FlagSet { | ||
| fs := flag.NewFlagSet("unsecured-jwt-info info settings", flag.ContinueOnError) | ||
| return fs | ||
| } | ||
|
|
||
| // Implements apis.TokenInfo | ||
| func (v UnsecuredJWTVerifier) VerifyToken(ctx context.Context, request apis.VerifyRequest) (apis.VerifyResponse, error) { | ||
| if request.Token == "" { | ||
| return getVerifyResponseResponse(StatusEmptyToken) | ||
| } | ||
|
|
||
| header, claimSet, err := Decode(request.Token) | ||
| if err != nil { | ||
| return getVerifyResponseResponse(StatusParseJWTFailed) | ||
| } | ||
| if header.Algorithm != AlgorithmNone { | ||
| return getVerifyResponseResponse(StatusWrongAlgorithm) | ||
| } | ||
|
|
||
| if len(v.claimSub) != 0 { | ||
| if _, ok := v.claimSub[claimSet.Sub]; !ok { | ||
| return getVerifyResponseResponse(StatusUnauthorized) | ||
| } | ||
| } | ||
| if claimSet.Iat < 1 { | ||
| return getVerifyResponseResponse(StatusNoIssueTimeInToken) | ||
| } | ||
| if claimSet.Exp < 1 { | ||
| return getVerifyResponseResponse(StatusNoExpirationTimeInToken) | ||
| } | ||
|
|
||
| earliest := int64(claimSet.Iat) - int64(clockSkew.Seconds()) | ||
| latest := int64(claimSet.Exp) + int64(clockSkew.Seconds()) | ||
| unix := time.Now().Unix() | ||
|
|
||
| if unix < earliest { | ||
| return getVerifyResponseResponse(StatusTokenTooEarly) | ||
| } | ||
| if unix > latest { | ||
| return getVerifyResponseResponse(StatusTokenExpired) | ||
| } | ||
| return getVerifyResponseResponse(StatusOK) | ||
| } | ||
|
|
||
| type Header struct { | ||
| Algorithm string `json:"alg"` | ||
| } | ||
|
|
||
| // kafka client sends float instead of int | ||
| type ClaimSet struct { | ||
| Sub string `json:"sub,omitempty"` | ||
| Exp float64 `json:"exp"` | ||
| Iat float64 `json:"iat"` | ||
| OtherClaims map[string]interface{} `json:"-"` | ||
| } | ||
|
|
||
| func Decode(token string) (*Header, *ClaimSet, error) { | ||
| args := strings.Split(token, ".") | ||
| if len(args) < 2 { | ||
| return nil, nil, errors.New("jws: invalid token received") | ||
| } | ||
| decodedHeader, err := base64.RawURLEncoding.DecodeString(args[0]) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| decodedPayload, err := base64.RawURLEncoding.DecodeString(args[1]) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| header := &Header{} | ||
| err = json.NewDecoder(bytes.NewBuffer(decodedHeader)).Decode(header) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| claimSet := &ClaimSet{} | ||
| err = json.NewDecoder(bytes.NewBuffer(decodedPayload)).Decode(claimSet) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| return header, claimSet, nil | ||
| } | ||
|
|
||
| func getVerifyResponseResponse(status int) (apis.VerifyResponse, error) { | ||
| success := status == StatusOK | ||
| return apis.VerifyResponse{Success: success, Status: int32(status)}, nil | ||
| } | ||
|
|
||
| func main() { | ||
| pluginMeta := &pluginMeta{} | ||
| fs := pluginMeta.flagSet() | ||
| fs.Var(&pluginMeta.claimSub, "claim-sub", "Allowed subject claim (user name)") | ||
| fs.Parse(os.Args[1:]) | ||
|
|
||
| logrus.Infof("Unsecured JWT sub claims: %v", pluginMeta.claimSub) | ||
|
|
||
| unsecuredJWTVerifier := &UnsecuredJWTVerifier{ | ||
| claimSub: pluginMeta.claimSub.AsMap(), | ||
| } | ||
|
|
||
| plugin.Serve(&plugin.ServeConfig{ | ||
| HandshakeConfig: shared.Handshake, | ||
| Plugins: map[string]plugin.Plugin{ | ||
| "unsecuredJWTInfo": &shared.TokenInfoPlugin{Impl: unsecuredJWTVerifier}, | ||
| }, | ||
| // A non-nil value here enables gRPC serving for this plugin... | ||
| GRPCServer: plugin.DefaultGRPCServer, | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| package util | ||
|
|
||
| import "fmt" | ||
|
|
||
| type ArrayFlags []string | ||
|
|
||
| func (i *ArrayFlags) String() string { | ||
| return fmt.Sprintf("%v", *i) | ||
| } | ||
|
|
||
| func (i *ArrayFlags) Set(value string) error { | ||
| *i = append(*i, value) | ||
| return nil | ||
| } | ||
|
|
||
| func (i *ArrayFlags) AsMap() map[string]struct{} { | ||
| result := make(map[string]struct{}) | ||
| for _, elem := range *i { | ||
| result[elem] = struct{}{} | ||
| } | ||
| return result | ||
| } |
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