Fix Business Logic Errors in Iris
Iris is a high-performance Go framework, but speed means nothing if your logic is broken. Business Logic Errors (BLE) occur when the application's flow is subverted by manipulating parameters the developer assumed were immutable. In Iris, this typically manifests during state transitions—like checkout processes or privilege escalations—where the server trusts client-side data for sensitive calculations or authorization checks.
The Vulnerable Pattern
app.Post("/api/v1/purchase", func(ctx iris.Context) {
type PurchaseRequest struct {
ItemID int `json:"item_id"`
Amount float64 `json:"total_price"` // VULNERABLE: Trusting the client for the price
}
var req PurchaseRequest
if err := ctx.ReadJSON(&req); err != nil {
ctx.StopWithStatus(iris.StatusBadRequest)
return
}
// Logic flaw: Attacker sends {"item_id": 1, "total_price": 0.01}
userBalance := db.GetBalance(ctx.Values().GetString("user_id"))
if userBalance >= req.Amount {
db.Deduct(req.Amount)
db.FulfillOrder(req.ItemID)
ctx.JSON(iris.Map{"status": "success"})
}
})The Secure Implementation
The vulnerable code demonstrates Parameter Tampering. By allowing the client to define the 'total_price', an attacker can bypass the intended cost of an item. The secure version ignores price data from the request body entirely. It uses the 'item_id' to look up the actual price in the database (the server-side source of truth). Furthermore, it ensures that sensitive state changes are handled server-side where the client has no influence over the variables governing the transaction logic.
app.Post("/api/v1/purchase", func(ctx iris.Context) {
type PurchaseRequest struct {
ItemID int `json:"item_id"`
}
var req PurchaseRequest
if err := ctx.ReadJSON(&req); err != nil {
ctx.StopWithStatus(iris.StatusBadRequest)
return
}
// SECURE: Fetch authoritative price from the Source of Truth (Database)
item, err := db.GetItemByID(req.ItemID)
if err != nil {
ctx.StopWithStatus(iris.StatusNotFound)
return
}
userID := ctx.Values().GetString("user_id")
userBalance := db.GetBalance(userID)
if userBalance < item.Price {
ctx.StopWithStatus(iris.StatusPaymentRequired)
return
}
// Atomic transaction to prevent race conditions
if err := db.ProcessOrder(userID, item.ID, item.Price); err != nil {
ctx.StopWithStatus(iris.StatusInternalServerError)
return
}
ctx.JSON(iris.Map{"status": "success"})
})
Your Iris API
might be exposed to Business Logic Errors
74% of Iris apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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