🛡️ Sentinel: [Medium] Add input validation to prevent information disclosure

.jules/sentinel.md

@@ -12,3 +12,8 @@
 **Vulnerability:** Raw `stop()` and `warning()` calls without `call. = FALSE` in `llcont.R` and `vuongtest.R` exposed execution stack/call details when raised.
 **Learning:** While some instances of `stop()` inside `tryCatch()` were previously fixed to hide the call stack, other standalone exceptions and warnings still leaked call context. Security must be consistently applied across the entire codebase.
 **Prevention:** Always set `call. = FALSE` when using `stop()` or `warning()` to enforce a secure-by-default boundary and prevent internal execution paths from being disclosed to the end user.
+
+## 2024-07-25 - Prevent Information Disclosure via Unvalidated Arguments
+**Vulnerability:** Top-level exported functions (`vuongtest`, `icci`) did not validate user arguments (like `nested`, `adj`, `conf.level`). Passing malformed inputs bypassed the secure `stop(..., call. = FALSE)` checks and caused raw R exceptions to be thrown deep inside nested calls (e.g., matrix operations or internal conditional evaluations), leaking the internal execution context/call stack.
+**Learning:** Security boundaries (like `call. = FALSE`) are only effective if inputs are sanitized before they trigger internal system errors. Unvalidated inputs can act as an attack vector to force internal state disclosure.
+**Prevention:** Always validate the type, length, and valid bounds of user-supplied arguments at the very beginning of exported functions to fail fast and securely with a controlled error message.

R/icci.R

@@ -65,6 +65,10 @@
 #' @export
 icci <- function(object1, object2, conf.level=.95, ll1=llcont, ll2=llcont) {
 
+  if (!is.numeric(conf.level) || length(conf.level) != 1 || is.na(conf.level) || conf.level <= 0 || conf.level >= 1) {
+    stop("conf.level must be a single number between 0 and 1", call. = FALSE)
+  }
+
   ## check objects, issue warnings/errors, get classes/calls
   obinfo <- check.obj(object1, object2)
   callA <- obinfo$callA; classA <- obinfo$classA

R/vuongtest.R

@@ -98,6 +98,13 @@
 #' @export
 vuongtest <- function(object1, object2, nested=FALSE, adj="none", ll1=llcont, ll2=llcont, score1=NULL, score2=NULL, vc1=vcov, vc2=vcov) {
 
+  if (!is.logical(nested) || length(nested) != 1 || is.na(nested)) {
+    stop("nested must be a single TRUE or FALSE value", call. = FALSE)
+  }
+  if (!is.character(adj) || length(adj) != 1 || is.na(adj) || !(adj %in% c("none", "aic", "bic"))) {
+    stop("adj must be 'none', 'aic', or 'bic'", call. = FALSE)
+  }
+
   ## check objects, issue warnings/errors, get classes/calls
   obinfo <- check.obj(object1, object2)
   callA <- obinfo$callA; classA <- obinfo$classA