[pitboss/grind] deferred session-0014 (20260522T163126Z-7d60)

src/dynamic/framework/adapters/crypto_java.rs

@@ -0,0 +1,184 @@
+//! Java [`super::super::FrameworkAdapter`] matching weak-crypto
+//! sink constructions (`java.util.Random.nextBytes`,
+//! `MessageDigest.getInstance("MD5"|"SHA-1")`,
+//! `Cipher.getInstance("DES"|"RC4"|"AES/ECB")`,
+//! `KeyGenerator.getInstance("DES")`).
+//!
+//! Phase 11 (Track L.9).  Fires when the function body invokes one
+//! of the canonical Java weak-crypto entry points and the
+//! surrounding source imports the matching `java.util.Random` /
+//! `java.security.*` / `javax.crypto.*` module.
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+
+pub struct CryptoJavaAdapter;
+
+const ADAPTER_NAME: &str = "crypto-java";
+
+fn callee_is_weak_crypto(name: &str) -> bool {
+    let last = name.rsplit_once('.').map(|(_, s)| s).unwrap_or(name);
+    matches!(
+        last,
+        "nextBytes" | "nextInt" | "nextLong" | "nextFloat" | "nextDouble" | "getInstance"
+    ) || matches!(
+        name,
+        "java.util.Random.nextBytes"
+            | "Random.nextBytes"
+            | "MessageDigest.getInstance"
+            | "Cipher.getInstance"
+            | "KeyGenerator.getInstance"
+            | "Mac.getInstance"
+    )
+}
+
+fn source_imports_java_crypto(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"java.util.Random",
+        b"java.security.MessageDigest",
+        b"javax.crypto.Cipher",
+        b"javax.crypto.KeyGenerator",
+        b"javax.crypto.Mac",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+/// Returns `true` when the surrounding source visibly routes the
+/// crypto call through a hardened path (`SecureRandom`,
+/// `MessageDigest.getInstance("SHA-256")` or stronger,
+/// `Cipher.getInstance("AES/GCM/...")`).
+fn source_routed_through_strong_path(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"java.security.SecureRandom",
+        b"SecureRandom.getInstanceStrong",
+        b"new SecureRandom",
+        b"\"SHA-256\"",
+        b"\"SHA-384\"",
+        b"\"SHA-512\"",
+        b"\"SHA3-256\"",
+        b"\"AES/GCM/",
+        b"\"AES/CBC/PKCS5Padding\"",
+        b"\"ChaCha20-Poly1305\"",
+        b"\"HmacSHA256\"",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+impl FrameworkAdapter for CryptoJavaAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::Java
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        _ast: tree_sitter::Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        if source_routed_through_strong_path(file_bytes) {
+            return None;
+        }
+        let matches_call = super::any_callee_matches(summary, callee_is_weak_crypto);
+        let matches_source = source_imports_java_crypto(file_bytes);
+        if matches_call && matches_source {
+            Some(FrameworkBinding {
+                adapter: ADAPTER_NAME.to_owned(),
+                kind: EntryKind::Function,
+                route: None,
+                request_params: Vec::new(),
+                response_writer: None,
+                middleware: Vec::new(),
+            })
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn parse_java(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_java::LANGUAGE);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    #[test]
+    fn fires_on_util_random_nextbytes() {
+        let src: &[u8] = b"import java.util.Random;\n\
+            public class Vuln {\n    public static byte[] run(String v) {\n        Random r = new Random(0L);\n        byte[] key = new byte[2];\n        r.nextBytes(key);\n        return key;\n    }\n}\n";
+        let tree = parse_java(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![crate::summary::CalleeSite::bare("nextBytes")],
+            ..Default::default()
+        };
+        assert!(
+            CryptoJavaAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_some()
+        );
+    }
+
+    #[test]
+    fn fires_on_message_digest_md5() {
+        let src: &[u8] = b"import java.security.MessageDigest;\n\
+            public class Vuln {\n    public static byte[] sign(byte[] v) throws Exception {\n        MessageDigest md = MessageDigest.getInstance(\"MD5\");\n        return md.digest(v);\n    }\n}\n";
+        let tree = parse_java(src);
+        let summary = FuncSummary {
+            name: "sign".into(),
+            callees: vec![crate::summary::CalleeSite::bare("MessageDigest.getInstance")],
+            ..Default::default()
+        };
+        assert!(
+            CryptoJavaAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_some()
+        );
+    }
+
+    #[test]
+    fn skips_when_source_routes_through_secure_random() {
+        let src: &[u8] = b"import java.util.Random;\nimport java.security.SecureRandom;\n\
+            public class Vuln {\n    public static byte[] run(String v) {\n        if (v.contains(\"STRONG\")) { byte[] k = new byte[32]; new SecureRandom().nextBytes(k); return k; }\n        Random r = new Random(0L);\n        byte[] k = new byte[2];\n        r.nextBytes(k);\n        return k;\n    }\n}\n";
+        let tree = parse_java(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![crate::summary::CalleeSite::bare("nextBytes")],
+            ..Default::default()
+        };
+        assert!(
+            CryptoJavaAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_none()
+        );
+    }
+
+    #[test]
+    fn skips_plain_method() {
+        let src: &[u8] = b"public class Plain { public static int add(int a, int b) { return a + b; } }\n";
+        let tree = parse_java(src);
+        let summary = FuncSummary {
+            name: "add".into(),
+            ..Default::default()
+        };
+        assert!(
+            CryptoJavaAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_none()
+        );
+    }
+}