Do not send envVars in ServerInfo() (#4422)

Sending envVars along with access and secret
exposes the entire minio server's sensitive
information. This will be an unexpected
situation for all users.

If at all we need to look for things like if
credentials are set through env, we should
only have access to only this information
not the entire set of system envs.

Makefile

@@ -124,7 +124,7 @@ test: build
 	@echo "Done."
 
 coverage: build
-	@echo -n "Running all coverage for minio: "
+	@echo "Running all coverage for minio: "
 	@./buildscripts/go-coverage.sh
 	@echo "Done."
 

browser/app/js/components/Browse.js

@@ -68,7 +68,7 @@ export default class Browse extends React.Component {
           memory: res.MinioMemory,
           platform: res.MinioPlatform,
           runtime: res.MinioRuntime,
-          envVars: res.MinioEnvVars
+          info: res.MinioGlobalInfo
         })
         dispatch(actions.setServerInfo(serverInfo))
       })

browser/app/js/components/SettingsModal.js

@@ -34,22 +34,11 @@ class SettingsModal extends React.Component {
 
     let accessKeyEnv = ''
     let secretKeyEnv = ''
-    // Check environment variables first. They may or may not have been
-    // loaded already; they load in Browse#componentDidMount.
-    if (serverInfo.envVars) {
-      serverInfo.envVars.forEach(envVar => {
-        let keyVal = envVar.split('=')
-        if (keyVal[0] == 'MINIO_ACCESS_KEY') {
-          accessKeyEnv = keyVal[1]
-        } else if (keyVal[0] == 'MINIO_SECRET_KEY') {
-          secretKeyEnv = keyVal[1]
-        }
-      })
-    }
-    if (accessKeyEnv != '' || secretKeyEnv != '') {
+    // Check environment variables first.
+    if (serverInfo.info.isEnvCreds) {
       dispatch(actions.setSettings({
-        accessKey: accessKeyEnv,
-        secretKey: secretKeyEnv,
+          accessKey: 'xxxxxxxxx',
+          secretKey: 'xxxxxxxxx',
           keysReadOnly: true
       }))
     } else {

cmd/globals.go

@@ -64,6 +64,7 @@ var (
 
 	// This flag is set to 'true' by default
 	globalIsBrowserEnabled = true
+
 	// This flag is set to 'true' when MINIO_BROWSER env is set.
 	globalIsEnvBrowser = false
 
@@ -72,6 +73,7 @@ var (
 
 	// This flag is set to 'true' wen MINIO_REGION env is set.
 	globalIsEnvRegion = false
+
 	// This flag is set to 'us-east-1' by default
 	globalServerRegion = globalMinioDefaultRegion
 
@@ -128,3 +130,23 @@ var (
 	colorBold = color.New(color.Bold).SprintFunc()
 	colorBlue = color.New(color.FgBlue).SprintfFunc()
 )
+
+// Returns minio global information, as a key value map.
+// returned list of global values is not an exhaustive
+// list. Feel free to add new relevant fields.
+func getGlobalInfo() (globalInfo map[string]interface{}) {
+	globalInfo = map[string]interface{}{
+		"isDistXL":         globalIsDistXL,
+		"isXL":             globalIsXL,
+		"isBrowserEnabled": globalIsBrowserEnabled,
+		"isEnvBrowser":     globalIsEnvBrowser,
+		"isEnvCreds":       globalIsEnvCreds,
+		"isEnvRegion":      globalIsEnvRegion,
+		"isSSL":            globalIsSSL,
+		"serverRegion":     globalServerRegion,
+		"serverUserAgent":  globalServerUserAgent,
+		// Add more relevant global settings here.
+	}
+
+	return globalInfo
+}

cmd/web-handlers.go

@@ -54,7 +54,7 @@ type ServerInfoRep struct {
 	MinioMemory     string
 	MinioPlatform   string
 	MinioRuntime    string
-	MinioEnvVars  []string
+	MinioGlobalInfo map[string]interface{}
 	UIVersion       string `json:"uiVersion"`
 }
 
@@ -80,8 +80,8 @@ func (web *webAPIHandlers) ServerInfo(r *http.Request, args *WebGenericArgs, rep
 		runtime.GOARCH)
 	goruntime := fmt.Sprintf("Version: %s | CPUs: %s", runtime.Version(), strconv.Itoa(runtime.NumCPU()))
 
-	reply.MinioEnvVars = os.Environ()
 	reply.MinioVersion = Version
+	reply.MinioGlobalInfo = getGlobalInfo()
 	reply.MinioMemory = mem
 	reply.MinioPlatform = platform
 	reply.MinioRuntime = goruntime

cmd/web-handlers_test.go

@@ -236,6 +236,10 @@ func testServerInfoWebHandler(obj ObjectLayer, instanceType string, t TestErrHan
 	if serverInfoReply.MinioVersion != Version {
 		t.Fatalf("Cannot get minio version from server info handler")
 	}
+	globalInfo := getGlobalInfo()
+	if !reflect.DeepEqual(serverInfoReply.MinioGlobalInfo, globalInfo) {
+		t.Fatalf("Global info did not match got %#v, expected %#v", serverInfoReply.MinioGlobalInfo, globalInfo)
+	}
 }
 
 // Wrapper for calling MakeBucket Web Handler