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.

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
+}