jwt: Deprecate RSA usage, use HMAC instead.

HMAC is a much simpler implementation, providing the same
benefits as RSA, avoids additional steps and keeps the code
simpler.

This patch also additionally

- Implements PutObjectURL API.
- GetObjectURL, PutObjectURL take TargetHost as another
  argument for generating URL's for proper target destination.
- Adds experimental TLS support for JSON RPC calls.

Browser.md

@@ -0,0 +1,39 @@
+## Minio Browser
+
+Minio Browser uses Json Web Tokens to authenticate JSON RPC requests.
+
+Initial request generates a token for 'AccessKey' and 'SecretKey'
+provided by the user.
+
+<blockquote>
+Currently these tokens expire after 10hrs, this is not configurable yet.
+</blockquote>
+
+### Start minio server
+
+```
+minio server <testdir>
+```
+
+### JSON RPC APIs.
+
+JSON RPC namespace is `Web`.
+
+#### Auth Operations
+
+* Login - waits for 'username, password' and on success replies a new Json Web Token (JWT).
+* ResetToken - resets token, requires password and token.
+* Logout - currently a dummy operation.
+
+#### Bucket/Object Operations.
+
+* ListBuckets - lists buckets, requires a valid token.
+* ListObjects - lists objects, requires a valid token.
+* MakeBucket - make a new bucket, requires a valid token.
+* GetObjectURL - generates a URL for download access, requires a valid token.
+  (generated URL is valid for 1hr)
+* PutObjectURL - generates a URL for upload access, requies a valid token.
+  (generated URL is valid for 1hr)
+
+#### Server Operations. 
+* DiskInfo - get backend disk statistics.

JWT.md

@@ -1,61 +0,0 @@
-### Generate RSA keys for JWT
-
-```
-mkdir -p ~/.minio/web
-```
-
-```
-openssl genrsa -out ~/.minio/web/private.key 2048
-```
-
-```
-openssl rsa -in ~/.minio/web/private.key -outform PEM -pubout -out ~/.minio/web/public.key
-```
-### Start minio server
-
-```
-minio server <testdir>
-```
-
-### Implemented JSON RPC APIs.
-
-Namespace `Web`
-
-* Login - waits for 'username, password' and on success replies a new JWT token.
-* ResetToken - resets token, requires password and token.
-* Logout - currently a dummy operation.
-* ListBuckets - lists buckets, requires valid token.
-* ListObjects - lists objects, requires valid token.
-* GetObjectURL - generates a url for download access, requires valid token.
-
-### Now you can use `webrpc.js` to make requests.
-
-- Login example
-```js
-var webRPC = require('webrpc');
-var web = new webRPC("http://localhost:9001/rpc")
-
-// Generate JWT Token.
-web.Login({"username": "YOUR-ACCESS-KEY-ID", "password": "YOUR-SECRET-ACCESS-KEY"})
-  .then(function(data) {
-    console.log("success : ", data);
-  })
-  .catch(function(error) {
-    console.log("fail : ", error.toString());
-  });
-```
-
-- ListBuckets example
-```js
-var webRPC = require('webrpc');
-var web = new webRPC("http://localhost:9001/rpc", "my-token")
-
-// Generate Token.
-web.ListBuckets()
-  .then(function(data) {
-    console.log("Success : ", data);
-  })
-  .catch(function(error) {
-    console.log("fail : ", error.toString());
-  });
-```

jwt-auth-handler.go

@@ -43,13 +43,13 @@ func (h authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 	// Validate Authorization header to be valid.
 	jwt := InitJWT()
-	token, err := jwtgo.ParseFromRequest(r, func(token *jwtgo.Token) (interface{}, error) {
-		if _, ok := token.Method.(*jwtgo.SigningMethodRSA); !ok {
+	token, e := jwtgo.ParseFromRequest(r, func(token *jwtgo.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwtgo.SigningMethodHMAC); !ok {
 			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
 		}
-		return jwt.PublicKey, nil
+		return jwt.secretAccessKey, nil
 	})
-	if err != nil || !token.Valid {
+	if e != nil || !token.Valid {
 		w.WriteHeader(http.StatusUnauthorized)
 		return
 	}

jwt.go

@@ -17,11 +17,7 @@
 package main
 
 import (
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/pem"
-	"errors"
-	"io/ioutil"
+	"bytes"
 	"time"
 
 	jwtgo "github.com/dgrijalva/jwt-go"
@@ -31,72 +27,47 @@ import (
 
 // JWT - jwt auth backend
 type JWT struct {
-	// Public value.
-	PublicKey *rsa.PublicKey
-	// private values.
-	privateKey      *rsa.PrivateKey
-	accessKeyID     string
-	secretAccessKey string
+	accessKeyID     []byte
+	secretAccessKey []byte
 }
 
+// Default - each token expires in 10hrs.
 const (
-	jwtExpirationDelta = 10
+	tokenExpires time.Duration = 10
 )
 
 // InitJWT - initialize.
 func InitJWT() *JWT {
-	jwt := &JWT{
-		privateKey: getPrivateKey(),
-	}
-	// Validate if public key is of algorithm *rsa.PublicKey.
-	var ok bool
-	jwt.PublicKey, ok = jwt.privateKey.Public().(*rsa.PublicKey)
-	if !ok {
-		fatalIf(probe.NewError(errors.New("")), "Unsupported type of public key algorithm found.", nil)
-	}
-	// Load credentials configuration.
+	jwt := &JWT{}
+	// Load credentials.
 	config, err := loadConfigV2()
 	fatalIf(err.Trace("JWT"), "Unable to load configuration file.", nil)
 
 	// Save access, secret keys.
-	jwt.accessKeyID = config.Credentials.AccessKeyID
-	jwt.secretAccessKey = config.Credentials.SecretAccessKey
+	jwt.accessKeyID = []byte(config.Credentials.AccessKeyID)
+	jwt.secretAccessKey = []byte(config.Credentials.SecretAccessKey)
 	return jwt
 }
 
 // GenerateToken - generates a new Json Web Token based on the incoming user id.
-func (b *JWT) GenerateToken(userName string) (string, error) {
-	token := jwtgo.New(jwtgo.SigningMethodRS512)
+func (jwt *JWT) GenerateToken(userName string) (string, *probe.Error) {
+	token := jwtgo.New(jwtgo.SigningMethodHS512)
 	// Token expires in 10hrs.
-	token.Claims["exp"] = time.Now().Add(time.Hour * time.Duration(jwtExpirationDelta)).Unix()
+	token.Claims["exp"] = time.Now().Add(time.Hour * tokenExpires).Unix()
 	token.Claims["iat"] = time.Now().Unix()
 	token.Claims["sub"] = userName
-	tokenString, err := token.SignedString(b.privateKey)
-	if err != nil {
-		return "", err
+	tokenString, e := token.SignedString(jwt.secretAccessKey)
+	if e != nil {
+		return "", probe.NewError(e)
 	}
 	return tokenString, nil
 }
 
-// Authenticate - authenticates the username and password.
-func (b *JWT) Authenticate(username, password string) bool {
-	hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(b.secretAccessKey), 10)
-	if username == b.accessKeyID {
-		return bcrypt.CompareHashAndPassword(hashedPassword, []byte(password)) == nil
-	}
+// Authenticate - authenticates incoming username and password.
+func (jwt *JWT) Authenticate(userName, password string) bool {
+	if !bytes.Equal([]byte(userName), jwt.accessKeyID) {
 		return false
 	}
-
-// getPrivateKey - get the generated private key.
-func getPrivateKey() *rsa.PrivateKey {
-	pemBytes, err := ioutil.ReadFile(mustGetPrivateKeyPath())
-	if err != nil {
-		panic(err)
-	}
-	data, _ := pem.Decode([]byte(pemBytes))
-	privateKeyImported, err := x509.ParsePKCS1PrivateKey(data.Bytes)
-	if err != nil {
-		panic(err)
-	}
-	return privateKeyImported
+	hashedPassword, _ := bcrypt.GenerateFromPassword(jwt.secretAccessKey, bcrypt.DefaultCost)
+	return bcrypt.CompareHashAndPassword(hashedPassword, []byte(password)) == nil
 }

pkg/fs/fs-multipart.go

@@ -162,7 +162,7 @@ func (fs Filesystem) NewMultipartUpload(bucket, object string) (string, *probe.E
 
 	bucket = fs.denormalizeBucket(bucket)
 	bucketPath := filepath.Join(fs.path, bucket)
-	if _, e := os.Stat(bucketPath); e != nil {
+	if _, e = os.Stat(bucketPath); e != nil {
 		// check bucket exists
 		if os.IsNotExist(e) {
 			return "", probe.NewError(BucketNotFound{Bucket: bucket})
@@ -172,7 +172,7 @@ func (fs Filesystem) NewMultipartUpload(bucket, object string) (string, *probe.E
 
 	objectPath := filepath.Join(bucketPath, object)
 	objectDir := filepath.Dir(objectPath)
-	if _, e := os.Stat(objectDir); e != nil {
+	if _, e = os.Stat(objectDir); e != nil {
 		if !os.IsNotExist(e) {
 			return "", probe.NewError(e)
 		}

routers.go

@@ -46,12 +46,20 @@ type WebAPI struct {
 	AccessLog bool
 	// Minio client instance.
 	Client minio.CloudStorageClient
+
+	// private params.
+	inSecure   bool   // Enabled if TLS is false.
+	apiAddress string // api destination address.
+	// accessKeys kept to be used internally.
+	accessKeyID     string
+	secretAccessKey string
 }
 
 func getWebAPIHandler(web *WebAPI) http.Handler {
 	var mwHandlers = []MiddlewareHandler{
 		TimeValidityHandler, // Validate time.
 		CorsHandler,         // CORS added only for testing purposes.
+		AuthHandler,         // Authentication handler for verifying tokens.
 	}
 	if web.AccessLog {
 		mwHandlers = append(mwHandlers, AccessLogHandler)
@@ -106,20 +114,27 @@ func registerCloudStorageAPI(mux *router.Router, a CloudStorageAPI) {
 // getNewWebAPI instantiate a new WebAPI.
 func getNewWebAPI(conf cloudServerConfig) *WebAPI {
 	// Split host port.
-	_, port, e := net.SplitHostPort(conf.Address)
+	host, port, e := net.SplitHostPort(conf.Address)
 	fatalIf(probe.NewError(e), "Unable to parse web addess.", nil)
 
-	// Default host to 'localhost'.
-	host := "localhost"
+	// Default host is 'localhost', if no host present.
+	if host == "" {
+		host = "localhost"
+	}
 
 	// Initialize minio client for AWS Signature Version '4'
-	client, e := minio.NewV4(net.JoinHostPort(host, port), conf.AccessKeyID, conf.SecretAccessKey, true)
+	inSecure := !conf.TLS // Insecure true when TLS is false.
+	client, e := minio.NewV4(net.JoinHostPort(host, port), conf.AccessKeyID, conf.SecretAccessKey, inSecure)
 	fatalIf(probe.NewError(e), "Unable to initialize minio client", nil)
 
 	web := &WebAPI{
 		FSPath:          conf.Path,
 		AccessLog:       conf.AccessLog,
 		Client:          client,
+		inSecure:        inSecure,
+		apiAddress:      conf.Address,
+		accessKeyID:     conf.AccessKeyID,
+		secretAccessKey: conf.SecretAccessKey,
 	}
 	return web
 }

web-config.go

@@ -1,64 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2016 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package main
-
-import (
-	"os"
-	"path/filepath"
-
-	"github.com/minio/minio-xl/pkg/probe"
-	"github.com/minio/minio/pkg/user"
-)
-
-var customWebConfigDir = ""
-
-// getWebConfigDir get web config dir.
-func getWebConfigDir() (string, *probe.Error) {
-	if customWebConfigDir != "" {
-		return customWebConfigDir, nil
-	}
-	homeDir, e := user.HomeDir()
-	if e != nil {
-		return "", probe.NewError(e)
-	}
-	webConfigDir := filepath.Join(homeDir, ".minio", "web")
-	return webConfigDir, nil
-}
-
-func mustGetWebConfigDir() string {
-	webConfigDir, err := getWebConfigDir()
-	fatalIf(err.Trace(), "Unable to get config path.", nil)
-	return webConfigDir
-}
-
-// createWebConfigDir create users config path
-func createWebConfigDir() *probe.Error {
-	webConfigDir, err := getWebConfigDir()
-	if err != nil {
-		return err.Trace()
-	}
-	if err := os.MkdirAll(webConfigDir, 0700); err != nil {
-		return probe.NewError(err)
-	}
-	return nil
-}
-
-func mustGetPrivateKeyPath() string {
-	webConfigDir, err := getWebConfigDir()
-	fatalIf(err.Trace(), "Unable to get config path.", nil)
-	return webConfigDir + "/private.key"
-}

web-definitions.go

@@ -53,8 +53,16 @@ type ObjectInfo struct {
 	Size int64 `json:"size"`
 }
 
-// GetObjectURLArgs - get object url.
+// PutObjectURLArgs - args to generate url for upload access.
+type PutObjectURLArgs struct {
+	TargetHost string `json:"targetHost"`
+	BucketName string `json:"bucketName"`
+	ObjectName string `json:"objectName"`
+}
+
+// GetObjectURLArgs - args to generate url for download access.
 type GetObjectURLArgs struct {
+	TargetHost string `json:"targetHost"`
 	BucketName string `json:"bucketName"`
 	ObjectName string `json:"objectName"`
 }

web-handlers.go

@@ -18,10 +18,13 @@ package main
 
 import (
 	"fmt"
+	"net"
 	"net/http"
 	"time"
 
 	jwtgo "github.com/dgrijalva/jwt-go"
+	"github.com/minio/minio-go"
+	"github.com/minio/minio-xl/pkg/probe"
 	"github.com/minio/minio/pkg/disk"
 )
 
@@ -29,13 +32,13 @@ import (
 // authenticated request.
 func isAuthenticated(req *http.Request) bool {
 	jwt := InitJWT()
-	tokenRequest, err := jwtgo.ParseFromRequest(req, func(token *jwtgo.Token) (interface{}, error) {
-		if _, ok := token.Method.(*jwtgo.SigningMethodRSA); !ok {
+	tokenRequest, e := jwtgo.ParseFromRequest(req, func(token *jwtgo.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwtgo.SigningMethodHMAC); !ok {
 			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
 		}
-		return jwt.PublicKey, nil
+		return jwt.secretAccessKey, nil
 	})
-	if err != nil {
+	if e != nil {
 		return false
 	}
 	return tokenRequest.Valid
@@ -46,9 +49,9 @@ func (web *WebAPI) DiskInfo(r *http.Request, args *DiskInfoArgs, reply *disk.Inf
 	if !isAuthenticated(r) {
 		return errUnAuthorizedRequest
 	}
-	info, err := disk.GetInfo(web.FSPath)
-	if err != nil {
-		return err
+	info, e := disk.GetInfo(web.FSPath)
+	if e != nil {
+		return e
 	}
 	*reply = info
 	return nil
@@ -67,9 +70,9 @@ func (web *WebAPI) ListBuckets(r *http.Request, args *ListBucketsArgs, reply *[]
 	if !isAuthenticated(r) {
 		return errUnAuthorizedRequest
 	}
-	buckets, err := web.Client.ListBuckets()
-	if err != nil {
-		return err
+	buckets, e := web.Client.ListBuckets()
+	if e != nil {
+		return e
 	}
 	for _, bucket := range buckets {
 		*reply = append(*reply, BucketInfo{
@@ -101,16 +104,60 @@ func (web *WebAPI) ListObjects(r *http.Request, args *ListObjectsArgs, reply *[]
 	return nil
 }
 
-// GetObjectURL - get object url.
+func getTargetHost(apiAddress, targetHost string) (string, *probe.Error) {
+	if targetHost != "" {
+		_, port, e := net.SplitHostPort(apiAddress)
+		if e != nil {
+			return "", probe.NewError(e)
+		}
+		host, _, e := net.SplitHostPort(targetHost)
+		if e != nil {
+			return "", probe.NewError(e)
+		}
+		targetHost = net.JoinHostPort(host, port)
+	}
+	return targetHost, nil
+}
+
+// PutObjectURL - generates url for upload access.
+func (web *WebAPI) PutObjectURL(r *http.Request, args *PutObjectURLArgs, reply *string) error {
+	if !isAuthenticated(r) {
+		return errUnAuthorizedRequest
+	}
+	targetHost, err := getTargetHost(web.apiAddress, args.TargetHost)
+	if err != nil {
+		return probe.WrapError(err)
+	}
+	client, e := minio.NewV4(targetHost, web.accessKeyID, web.secretAccessKey, web.inSecure)
+	if e != nil {
+		return e
+	}
+	signedURLStr, e := client.PresignedPutObject(args.BucketName, args.ObjectName, time.Duration(60*60)*time.Second)
+	if e != nil {
+		return e
+	}
+	*reply = signedURLStr
+	return nil
+}
+
+// GetObjectURL - generates url for download access.
 func (web *WebAPI) GetObjectURL(r *http.Request, args *GetObjectURLArgs, reply *string) error {
 	if !isAuthenticated(r) {
 		return errUnAuthorizedRequest
 	}
-	urlStr, err := web.Client.PresignedGetObject(args.BucketName, args.ObjectName, time.Duration(60*60)*time.Second)
+	targetHost, err := getTargetHost(web.apiAddress, args.TargetHost)
 	if err != nil {
-		return err
+		return probe.WrapError(err)
+	}
+	client, e := minio.NewV4(targetHost, web.accessKeyID, web.secretAccessKey, web.inSecure)
+	if e != nil {
+		return e
+	}
+	signedURLStr, e := client.PresignedGetObject(args.BucketName, args.ObjectName, time.Duration(60*60)*time.Second)
+	if e != nil {
+		return e
 	}
-	*reply = urlStr
+	*reply = signedURLStr
 	return nil
 }
 
@@ -120,7 +167,7 @@ func (web *WebAPI) Login(r *http.Request, args *LoginArgs, reply *AuthToken) err
 	if jwt.Authenticate(args.Username, args.Password) {
 		token, err := jwt.GenerateToken(args.Username)
 		if err != nil {
-			return err
+			return probe.WrapError(err.Trace())
 		}
 		reply.Token = token
 		return nil
@@ -134,7 +181,7 @@ func (web *WebAPI) RefreshToken(r *http.Request, args *LoginArgs, reply *AuthTok
 		jwt := InitJWT()
 		token, err := jwt.GenerateToken(args.Username)
 		if err != nil {
-			return err
+			return probe.WrapError(err.Trace())
 		}
 		reply.Token = token
 		return nil