Fix: derivedKey should not be a global variable (#862)

Embedded console was ignoring values set by CONSOLE_PBKDF_PASSPHRASE and
CONSOLE_PBKDF_SALT for generating new session tokens, derivedKey is used
to encrypt/decrypt session tokens generated by console

Signed-off-by: Lenin Alevski <alevsk.8772@gmail.com>

pkg/auth/idp/oauth2/provider.go

@@ -96,7 +96,9 @@ type Provider struct {
 
 // derivedKey is the key used to compute the HMAC for signing the oauth state parameter
 // its derived using pbkdf on CONSOLE_IDP_HMAC_PASSPHRASE with CONSOLE_IDP_HMAC_SALT
-var derivedKey = pbkdf2.Key([]byte(getPassphraseForIdpHmac()), []byte(getSaltForIdpHmac()), 4096, 32, sha1.New)
+var derivedKey = func() []byte {
+	return pbkdf2.Key([]byte(getPassphraseForIdpHmac()), []byte(getSaltForIdpHmac()), 4096, 32, sha1.New)
+}
 
 // NewOauth2ProviderClient instantiates a new oauth2 client using the configured credentials
 // it returns a *Provider object that contains the necessary configuration to initiate an
@@ -227,7 +229,7 @@ func validateOauth2State(state string) error {
 	// extract the state and hmac
 	incomingState, incomingHmac := s[0], s[1]
 	// validate that hmac(incomingState + pbkdf2(secret, salt)) == incomingHmac
-	if calculatedHmac := utils.ComputeHmac256(incomingState, derivedKey); calculatedHmac != incomingHmac {
+	if calculatedHmac := utils.ComputeHmac256(incomingState, derivedKey()); calculatedHmac != incomingHmac {
 		return fmt.Errorf("oauth2 state is invalid, expected %s, got %s", calculatedHmac, incomingHmac)
 	}
 	return nil
@@ -236,7 +238,7 @@ func validateOauth2State(state string) error {
 // GetRandomStateWithHMAC computes message + hmac(message, pbkdf2(key, salt)) to be used as state during the oauth authorization
 func GetRandomStateWithHMAC(length int) string {
 	state := utils.RandomCharString(length)
-	hmac := utils.ComputeHmac256(state, derivedKey)
+	hmac := utils.ComputeHmac256(state, derivedKey())
 	return base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", state, hmac)))
 }
 

pkg/auth/token.go

@@ -50,7 +50,9 @@ var (
 )
 
 // derivedKey is the key used to encrypt the session token claims, its derived using pbkdf on CONSOLE_PBKDF_PASSPHRASE with CONSOLE_PBKDF_SALT
-var derivedKey = pbkdf2.Key([]byte(token.GetPBKDFPassphrase()), []byte(token.GetPBKDFSalt()), 4096, 32, sha1.New)
+var derivedKey = func() []byte {
+	return pbkdf2.Key([]byte(token.GetPBKDFPassphrase()), []byte(token.GetPBKDFSalt()), 4096, 32, sha1.New)
+}
 
 // IsSessionTokenValid returns true or false depending if the provided session token is valid or not
 func IsSessionTokenValid(token string) bool {
@@ -171,7 +173,7 @@ func encrypt(plaintext, associatedData []byte) ([]byte, error) {
 	var aead cipher.AEAD
 	switch algorithm {
 	case aesGcm:
-		mac := hmac.New(sha256.New, derivedKey)
+		mac := hmac.New(sha256.New, derivedKey())
 		mac.Write(iv)
 		sealingKey := mac.Sum(nil)
 
@@ -186,7 +188,7 @@ func encrypt(plaintext, associatedData []byte) ([]byte, error) {
 		}
 	case c20p1305:
 		var sealingKey []byte
-		sealingKey, err = chacha20.HChaCha20(derivedKey, iv) // HChaCha20 expects nonce of 16 bytes
+		sealingKey, err = chacha20.HChaCha20(derivedKey(), iv) // HChaCha20 expects nonce of 16 bytes
 		if err != nil {
 			return nil, err
 		}
@@ -237,7 +239,7 @@ func decrypt(ciphertext []byte, associatedData []byte) ([]byte, error) {
 	var aead cipher.AEAD
 	switch algorithm[0] {
 	case aesGcm:
-		mac := hmac.New(sha256.New, derivedKey)
+		mac := hmac.New(sha256.New, derivedKey())
 		mac.Write(iv[:])
 		sealingKey := mac.Sum(nil)
 		block, err := aes.NewCipher(sealingKey[:])
@@ -249,7 +251,7 @@ func decrypt(ciphertext []byte, associatedData []byte) ([]byte, error) {
 			return nil, err
 		}
 	case c20p1305:
-		sealingKey, err := chacha20.HChaCha20(derivedKey, iv[:]) // HChaCha20 expects nonce of 16 bytes
+		sealingKey, err := chacha20.HChaCha20(derivedKey(), iv[:]) // HChaCha20 expects nonce of 16 bytes
 		if err != nil {
 			return nil, err
 		}

portal-ui/build/asset-manifest.json

@@ -1,8 +1,8 @@
 {
   "files": {
     "main.css": "/static/css/main.8cfac526.chunk.css",
-    "main.js": "/static/js/main.9102697a.chunk.js",
-    "main.js.map": "/static/js/main.9102697a.chunk.js.map",
+    "main.js": "/static/js/main.e4d2482a.chunk.js",
+    "main.js.map": "/static/js/main.e4d2482a.chunk.js.map",
     "runtime-main.js": "/static/js/runtime-main.43a31377.js",
     "runtime-main.js.map": "/static/js/runtime-main.43a31377.js.map",
     "static/css/2.60e04a19.chunk.css": "/static/css/2.60e04a19.chunk.css",
@@ -20,6 +20,6 @@
     "static/css/2.60e04a19.chunk.css",
     "static/js/2.f1d0208d.chunk.js",
     "static/css/main.8cfac526.chunk.css",
-    "static/js/main.9102697a.chunk.js"
+    "static/js/main.e4d2482a.chunk.js"
   ]
 }

portal-ui/build/index.html

@@ -1 +1 @@
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+<!doctype html><html lang="en"><head><meta charset="utf-8"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="MinIO Console"/><link href="https://fonts.googleapis.com/css2?family=Lato:wght@400;500;700;900&display=swap" rel="stylesheet"/><link rel="apple-touch-icon" sizes="180x180" href="/apple-icon-180x180.png"/><link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png"/><link rel="icon" type="image/png" sizes="96x96" href="/favicon-96x96.png"/><link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png"/><link rel="manifest" href="/manifest.json"/><link rel="mask-icon" href="/safari-pinned-tab.svg" color="#3a4e54"/><title>MinIO Console</title><link href="/static/css/2.60e04a19.chunk.css" rel="stylesheet"><link href="/static/css/main.8cfac526.chunk.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div><script>!function(e){function r(r){for(var n,l,i=r[0],a=r[1],p=r[2],c=0,s=[];c<i.length;c++)l=i[c],Object.prototype.hasOwnProperty.call(o,l)&&o[l]&&s.push(o[l][0]),o[l]=0;for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(e[n]=a[n]);for(f&&f(r);s.length;)s.shift()();return u.push.apply(u,p||[]),t()}function t(){for(var e,r=0;r<u.length;r++){for(var t=u[r],n=!0,i=1;i<t.length;i++){var a=t[i];0!==o[a]&&(n=!1)}n&&(u.splice(r--,1),e=l(l.s=t[0]))}return e}var n={},o={1:0},u=[];function l(r){if(n[r])return n[r].exports;var t=n[r]={i:r,l:!1,exports:{}};return e[r].call(t.exports,t,t.exports,l),t.l=!0,t.exports}l.m=e,l.c=n,l.d=function(e,r,t){l.o(e,r)||Object.defineProperty(e,r,{enumerable:!0,get:t})},l.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},l.t=function(e,r){if(1&r&&(e=l(e)),8&r)return e;if(4&r&&"object"==typeof e&&e&&e.__esModule)return e;var t=Object.create(null);if(l.r(t),Object.defineProperty(t,"default",{enumerable:!0,value:e}),2&r&&"string"!=typeof e)for(var n in e)l.d(t,n,function(r){return e[r]}.bind(null,n));return t},l.n=function(e){var r=e&&e.__esModule?function(){return e.default}:function(){return e};return l.d(r,"a",r),r},l.o=function(e,r){return Object.prototype.hasOwnProperty.call(e,r)},l.p="/";var i=this["webpackJsonpportal-ui"]=this["webpackJsonpportal-ui"]||[],a=i.push.bind(i);i.push=r,i=i.slice();for(var p=0;p<i.length;p++)r(i[p]);var f=a;t()}([])</script><script src="/static/js/2.f1d0208d.chunk.js"></script><script src="/static/js/main.e4d2482a.chunk.js"></script></body></html>