[pitboss] phase 04: Track J.2 + Track L.2 — SSTI corpus + Jinja2 / ERB / Twig / Thymeleaf / Handlebars adapters

src/dynamic/framework/adapters/js_handlebars.rs

@@ -0,0 +1,95 @@
+//! JavaScript [`super::super::FrameworkAdapter`] matching Handlebars
+//! SSTI sinks.
+//!
+//! Phase 04 (Track J.2).  Fires when the function body invokes
+//! `Handlebars.compile(<tainted>)` (matched by the last segment of the
+//! callee — the call graph normaliser drops the receiver).
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+
+pub struct JsHandlebarsAdapter;
+
+const ADAPTER_NAME: &str = "js-handlebars";
+
+fn callee_is_handlebars(name: &str) -> bool {
+    let last = name.rsplit_once('.').map(|(_, s)| s).unwrap_or(name);
+    matches!(last, "compile" | "precompile" | "SafeString")
+}
+
+impl FrameworkAdapter for JsHandlebarsAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::JavaScript
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        _ast: tree_sitter::Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        let matches_call = super::any_callee_matches(summary, callee_is_handlebars);
+        let matches_source = file_bytes
+            .windows(b"handlebars".len())
+            .any(|w| w.eq_ignore_ascii_case(b"handlebars"))
+            || file_bytes
+                .windows(b"Handlebars".len())
+                .any(|w| w == b"Handlebars");
+        if matches_call && matches_source {
+            return Some(FrameworkBinding {
+                adapter: ADAPTER_NAME.to_owned(),
+                kind: EntryKind::Function,
+                route: None,
+                request_params: Vec::new(),
+                response_writer: None,
+                middleware: Vec::new(),
+            });
+        }
+        None
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn parse_js(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_javascript::LANGUAGE);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    #[test]
+    fn fires_on_handlebars_compile() {
+        let src: &[u8] = b"const Handlebars = require('handlebars');\nfunction render(body) {\n  return Handlebars.compile(body)({});\n}\n";
+        let tree = parse_js(src);
+        let summary = FuncSummary {
+            name: "render".into(),
+            callees: vec![crate::summary::CalleeSite::bare("compile")],
+            ..Default::default()
+        };
+        assert!(JsHandlebarsAdapter
+            .detect(&summary, tree.root_node(), src)
+            .is_some());
+    }
+
+    #[test]
+    fn skips_plain_function() {
+        let src: &[u8] = b"function add(a, b) { return a + b; }\n";
+        let tree = parse_js(src);
+        let summary = FuncSummary {
+            name: "add".into(),
+            ..Default::default()
+        };
+        assert!(JsHandlebarsAdapter
+            .detect(&summary, tree.root_node(), src)
+            .is_none());
+    }
+}