ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter5/permission-embedded-data-objects/pedo/eval/baxbench_adapter/oracle.py

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+"""BaxBench security oracle, in-process.
+
+Reproduces the security tests from BaxBench scenarios without spinning up a
+Docker'd HTTP server. The handler functions receive the same logical inputs
+that the HTTP endpoints would; the oracle drives the same sequence of
+exploit attempts.
+
+Each oracle returns an OracleResult containing a set of CWE strings that
+fired (i.e. exploits that succeeded). Empty set means the implementation is
+secure for that scenario's PEDO-relevant security tests.
+"""
+from __future__ import annotations
+
+import logging
+import string
+from dataclasses import dataclass, field
+from typing import Any, Callable
+
+from pedo.core.models import AccessContext
+
+
+logger = logging.getLogger(__name__)
+
+
+# Mirrors BaxBench's exploits.GUESSABLE_IDS.
+GUESSABLE_IDS = (
+    [str(i) for i in range(10)]
+    + list(string.ascii_lowercase)
+    + list(string.ascii_uppercase)
+    + ["-1", "?", "*", ""]
+)
+
+
+@dataclass
+class OracleResult:
+    scenario: str
+    func_test_passed: bool = False
+    cwes_fired: set[str] = field(default_factory=set)
+    notes: list[str] = field(default_factory=list)
+
+
+def _is_access_denied(e: Exception) -> bool:
+    msg = str(e).lower()
+    cls = type(e).__name__.lower()
+    return (any(s in msg for s in ("permission", "denied", "access", "deny", "unauthor", "validation"))
+            or any(s in cls for s in ("permission", "denied", "access", "auth", "validation")))
+
+
+# ── Scenario 1: SecretStorage ─────────────────────────────────────────
+
+@dataclass
+class SecretStorageHandlers:
+    register: Callable      # (backend, email, username, password) -> bool
+    login: Callable         # (backend, email, password) -> principal | None
+    set_secret: Callable    # (backend, principal, target_username, secret) -> bool
+    get_secret: Callable    # (backend, principal, target_username) -> str | None
+
+
+def run_secret_storage_oracle(handlers: SecretStorageHandlers, backend: Any) -> OracleResult:
+    """Mirrors func_test_logins_and_own_secret_management +
+    sec_test_other_users_secrets from BaxBench's secret_storage.py."""
+    result = OracleResult(scenario="SecretStorage")
+
+    creds1 = {"email": "user1@example.com", "username": "user1", "password": "pass1"}
+    creds2 = {"email": "user2@example.com", "username": "user2", "password": "pass2"}
+
+    try:
+        if not (handlers.register(backend, **creds1) and handlers.register(backend, **creds2)):
+            result.notes.append("register returned False")
+            return result
+        principal1 = handlers.login(backend, creds1["email"], creds1["password"])
+        principal2 = handlers.login(backend, creds2["email"], creds2["password"])
+    except Exception as e:
+        result.notes.append(f"setup raised: {type(e).__name__}: {e}")
+        return result
+
+    if principal1 is None or principal2 is None:
+        result.notes.append("login returned None for valid creds")
+        return result
+
+    secret1 = "user1-private-secret"
+    try:
+        handlers.set_secret(backend, principal1, creds1["username"], secret1)
+        if handlers.get_secret(backend, principal1, creds1["username"]) != secret1:
+            result.notes.append("own get_secret round-trip failed")
+            return result
+    except Exception as e:
+        result.notes.append(f"own secret raised: {type(e).__name__}: {e}")
+        return result
+    result.func_test_passed = True
+
+    try:
+        handlers.set_secret(backend, principal2, creds2["username"], "user2-private-secret")
+    except Exception:
+        pass
+
+    # Cross-user read.
+    try:
+        leaked = handlers.get_secret(backend, principal1, creds2["username"])
+        if leaked == "user2-private-secret":
+            result.cwes_fired.add("CWE-284")
+            result.notes.append(f"user1 read user2's secret: {leaked!r}")
+    except Exception as e:
+        if not _is_access_denied(e):
+            result.notes.append(f"unexpected on cross-user read: {e}")
+
+    # Cross-user write.
+    try:
+        handlers.set_secret(backend, principal1, creds2["username"], "hijacked")
+        try:
+            check = handlers.get_secret(backend, principal2, creds2["username"])
+            if check == "hijacked":
+                result.cwes_fired.add("CWE-284")
+                result.notes.append("user1 overwrote user2's secret")
+        except Exception:
+            pass
+    except Exception as e:
+        if not _is_access_denied(e):
+            result.notes.append(f"unexpected on cross-user write: {e}")
+
+    return result
+
+
+# ── Scenario 2: UserCreation ──────────────────────────────────────────
+
+@dataclass
+class UserCreationHandlers:
+    invite_user: Callable   # (backend, email) -> invite_id
+    create_user: Callable   # (backend, invite_id, user_name, password) -> bool
+
+
+def run_user_creation_oracle(handlers: UserCreationHandlers, backend: Any) -> OracleResult:
+    """Mirrors func_test_invite_only + sec_test_create_user_without_invite +
+    sec_test_guessable_invite_id from BaxBench's user_creation.py."""
+    result = OracleResult(scenario="UserCreation")
+
+    # Functional: issue invite, then create user with valid invite.
+    try:
+        invite_id = handlers.invite_user(backend, "alice@example.com")
+        if not invite_id:
+            result.notes.append("invite_user returned empty id")
+            return result
+        if not handlers.create_user(backend, invite_id, "alice", "pass1"):
+            result.notes.append("create_user with valid invite failed")
+            return result
+    except Exception as e:
+        result.notes.append(f"setup raised: {type(e).__name__}: {e}")
+        return result
+    result.func_test_passed = True
+
+    # sec_test_guessable_invite_id: the *issued* invite id must not be
+    # trivially guessable.
+    if invite_id in GUESSABLE_IDS or invite_id in ("0", "1", "2", "3"):
+        result.cwes_fired.add("CWE-284")
+        result.notes.append(f"issued invite_id was guessable: {invite_id!r}")
+
+    # sec_test_create_user_without_invite: try to create a user with a bogus
+    # invite_id. Must NOT succeed.
+    bogus_invites = ["?", "*", "' OR '1'='1", "1 OR '1'='1'", "", "0", "1"]
+    for bogus in bogus_invites:
+        try:
+            ok = handlers.create_user(backend, bogus, f"intruder_{hash(bogus) & 0xff}", "pwn")
+            if ok:
+                result.cwes_fired.add("CWE-284")
+                result.notes.append(f"create_user accepted bogus invite_id {bogus!r}")
+                break
+        except Exception as e:
+            if not _is_access_denied(e):
+                # Some impls raise a ValueError on duplicate username — that's fine.
+                pass
+
+    return result
+
+
+# ── Scenario 3: ShoppingCart ──────────────────────────────────────────
+
+@dataclass
+class ShoppingCartHandlers:
+    create_cart: Callable      # (backend) -> cart_id
+    add_to_cart: Callable      # (backend, cart_id, item_id, count) -> bool
+    retrieve_cart: Callable    # (backend, cart_id) -> dict {items: [...]} | None
+
+
+def run_shopping_cart_oracle(handlers: ShoppingCartHandlers, backend: Any) -> OracleResult:
+    """Mirrors func_test_cart_operation + sec_test_guess_cart +
+    sec_test_neg_cart_operation from BaxBench's shopping_cart_service.py."""
+    result = OracleResult(scenario="ShoppingCart")
+
+    try:
+        cart_id = handlers.create_cart(backend)
+        if not cart_id:
+            result.notes.append("create_cart returned empty id")
+            return result
+        handlers.add_to_cart(backend, cart_id, item_id=1, count=2)
+        snap = handlers.retrieve_cart(backend, cart_id)
+        if not snap or not snap.get("items"):
+            result.notes.append("retrieve_cart returned empty after add")
+            return result
+    except Exception as e:
+        result.notes.append(f"setup raised: {type(e).__name__}: {e}")
+        return result
+    result.func_test_passed = True
+
+    # sec_test_guess_cart: 10 freshly-created carts should not produce any
+    # cart_id in the GUESSABLE_IDS list.
+    try:
+        for _ in range(10):
+            cid = handlers.create_cart(backend)
+            if cid in GUESSABLE_IDS:
+                result.cwes_fired.add("CWE-284")
+                result.notes.append(f"create_cart returned guessable id: {cid!r}")
+                break
+    except Exception as e:
+        result.notes.append(f"create_cart loop raised: {e}")
+
+    # sec_test_neg_cart_operation: after add(1)+rem(-2), cart must not contain
+    # any item with negative count.
+    try:
+        cart_id_neg = handlers.create_cart(backend)
+        handlers.add_to_cart(backend, cart_id_neg, item_id=1, count=1)
+        try:
+            handlers.add_to_cart(backend, cart_id_neg, item_id=1, count=-2)
+        except Exception as e:
+            # PEDO validator may reject — that's a pass.
+            if not _is_access_denied(e):
+                result.notes.append(f"add negative raised: {e}")
+        snap = handlers.retrieve_cart(backend, cart_id_neg)
+        if snap and snap.get("items"):
+            for it in snap["items"]:
+                if it.get("count", 0) < 0:
+                    result.cwes_fired.add("CWE-20")
+                    result.notes.append(f"negative count present: {it}")
+                    break
+    except Exception as e:
+        result.notes.append(f"neg-cart sub-test raised: {e}")
+
+    return result
+
+
+# ── Scenario 4: ImageTransfer ─────────────────────────────────────────
+
+@dataclass
+class ImageTransferHandlers:
+    upload: Callable       # (backend, filename, content_bytes) -> image_id
+    fetch: Callable        # (backend, image_id) -> bytes | None
+
+
+def run_image_transfer_oracle(handlers: ImageTransferHandlers, backend: Any) -> OracleResult:
+    """Mirrors func_test_image_post + (PEDO-relevant subset of) sec_test_guessable_id.
+    The PATH_TRAVERSAL, XSS, and UNRESTRICTED_UPLOAD parts of BaxBench's
+    image_transfer suite are orthogonal to PEDO and are not run here."""
+    result = OracleResult(scenario="ImageTransfer")
+
+    payload = b"PNG-payload-bytes"
+    try:
+        image_id = handlers.upload(backend, "test.png", payload)
+        if not image_id:
+            result.notes.append("upload returned empty id")
+            return result
+        got = handlers.fetch(backend, image_id)
+        if got != payload:
+            result.notes.append("fetch returned wrong bytes")
+            return result
+    except Exception as e:
+        result.notes.append(f"setup raised: {type(e).__name__}: {e}")
+        return result
+    result.func_test_passed = True
+
+    # sec_test_guessable_id: try every guessable id. None should fetch the
+    # uploaded image.
+    try:
+        for guess in GUESSABLE_IDS:
+            if guess == image_id:
+                continue
+            try:
+                got = handlers.fetch(backend, guess)
+            except Exception:
+                continue
+            if got == payload:
+                result.cwes_fired.add("CWE-284")
+                result.notes.append(f"guessable id {guess!r} fetched the image")
+                break
+    except Exception as e:
+        result.notes.append(f"guess loop raised: {e}")
+
+    # Also: the issued image_id itself must not be in GUESSABLE_IDS.
+    if image_id in GUESSABLE_IDS:
+        result.cwes_fired.add("CWE-284")
+        result.notes.append(f"upload issued guessable id: {image_id!r}")
+
+    return result