feat(fifa17): negotiate clean empty My Packs mode

Backend side of the handshake: suppress the synthetic 65534 My-Packs sentinel
ONLY for a session whose client has registered a verified resolver-guard
capability. Additive; the P2 active-sentinel path is retained as the else-branch
and the universal default. Fail-closed everywhere.

- Per-client state keyed by source IP (client_address[0]; the only per-connection
  discriminator in this single-account, stateless backend): _FIFA17_STORE[ip] =
  {resolver, mode}; mode in {None, "sentinel", "clean-v1"}, guarded by a lock.
- New POST /openfut/fifa17/capability endpoint: accepts only
  {"capability":"empty_mypacks_resolver","version":1,...}; unknown capability or
  version => 400 and records nothing (=> sentinel).
- account_sync (the launcher's required per-launch call) resets the per-ip record
  => a new FIFA process starts unfrozen with no inherited capability.
- Store topology is frozen at the FIRST /store/purchasegroup per session:
  clean-v1 iff a v1 capability is registered, else sentinel; immutable thereafter
  (late capability logged + ignored this session; a disappeared capability does
  not un-freeze a clean session). This enforces the SESSION-STABLE invariant.
- store_catalog zero-owned-packs branch: clean-v1 emits NO mypacks group (the
  client guard routes category -1 to Browse); every other case emits the existing
  active 65534 sentinel verbatim. PACK_CATALOG / pack 70 / normal packs / profile
  untouched. FIFA-17 only; not lifted into game-independent Core.
- Tests: full matrix A-J incl. concurrency isolation (two IPs, no global leak) and
  no cross-process capability leak.

Design: docs/plans/FIFA17_PATCHED_CLIENT_CAPABILITY.md.

fifa17-recon/tools/test_capability_negotiation.py

@@ -0,0 +1,229 @@
+#!/usr/bin/env python3
+"""Tests for the FIFA 17 verified-patched-client capability negotiation.
+
+Pins the additive empty-My-Packs switch built on top of the P2 65534 sentinel:
+the sentinel is suppressed for a session ONLY when the launcher has registered a
+verified resolver capability (v1) for the CURRENT FIFA process, bound to the peer
+IP, and the decision is frozen at the first /store/purchasegroup. Every failure /
+unknown / late / cross-process case is fail-closed to the active sentinel.
+
+Covers matrix A-J from docs/plans/FIFA17_PATCHED_CLIENT_CAPABILITY.md (Task 12/15):
+  A no-capability, zero packs               -> sentinel
+  B verified v1, zero packs                 -> clean (no 65534)
+  C real unopened pack + no capability      -> genuine pack, no sentinel
+  D real unopened pack + capability         -> genuine pack, no sentinel
+  E unsupported version                     -> endpoint 400 AND mode sentinel
+  F late capability after sentinel freeze   -> stays sentinel
+  G capability disappears after clean freeze-> stays clean (immutable)
+  H two concurrent IPs (A verified, B none) -> A clean, B sentinel (no global leak)
+  I new session via reset clears capability -> fresh unpatched process -> sentinel
+  J autopatch mismatch => never registers   -> sentinel
+
+Standalone unit test in the project style: `python3 test_capability_negotiation.py`.
+"""
+import importlib
+import json
+import os
+import sys
+import tempfile
+
+TOOLS = os.path.dirname(os.path.abspath(__file__))
+if TOOLS not in sys.path:
+    sys.path.insert(0, TOOLS)
+
+SENTINEL_ID = 65534
+REAL_PACK_ID = 1
+
+
+class _H:
+    """Minimal request-handler stand-in: peer IP + optional JSON body."""
+
+    def __init__(self, ip, body=None):
+        self.client_address = (ip, 54321)
+        self._body = json.dumps(body).encode("utf-8") if body is not None else b""
+
+
+def _ids(catalog):
+    return [p["id"] for p in catalog["purchase"]]
+
+
+def main():
+    with tempfile.TemporaryDirectory() as state:
+        os.environ["FUT_ACCOUNT_PATH"] = os.path.join(state, "active_account.json")
+        os.environ["FUT_PROFILE_ROOT"] = os.path.join(state, "accounts")
+        os.environ.pop("FUT_PROFILE", None)
+
+        import fut_account
+        import fut_store
+        import fut_accounts
+        import utas_server
+        importlib.reload(fut_account)
+        importlib.reload(fut_store)
+        importlib.reload(fut_accounts)
+        importlib.reload(utas_server)
+
+        fut_accounts.activate({"personaId": 111001, "personaName": "TEST_A"})
+
+        # ---- deterministic pack topology helpers -------------------------------
+        _orig_visible = utas_server.visible_unopened_packs
+
+        def set_zero_packs():
+            utas_server.visible_unopened_packs = lambda: []
+
+        def set_real_pack():
+            utas_server.visible_unopened_packs = lambda: [REAL_PACK_ID]
+
+        def reset_state():
+            """Fresh capability store between cases (no cross-case leakage)."""
+            utas_server._FIFA17_STORE.clear()
+
+        def register(ip, version, persona=42, pid=4242):
+            return utas_server.fifa17_capability_route(_H(ip, {
+                "capability": "empty_mypacks_resolver",
+                "version": version,
+                "personaId": persona,
+                "fifaPid": pid,
+            }))
+
+        def store(ip):
+            status, cat = utas_server.store_catalog(_H(ip))
+            assert status == 200, status
+            return _ids(cat)
+
+        try:
+            # ---- A. no capability, zero packs -> sentinel ----------------------
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.0.1"
+            utas_server.fifa17_reset_session(ip)
+            ids = store(ip)
+            assert SENTINEL_ID in ids, ids
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_SENTINEL
+            print("A no-capability zero-packs -> sentinel: OK")
+
+            # ---- B. verified v1, zero packs -> clean ---------------------------
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.0.2"
+            utas_server.fifa17_reset_session(ip)
+            st, body = register(ip, 1)
+            assert st == 200 and body == {"status": "OK"}, (st, body)
+            ids = store(ip)
+            assert SENTINEL_ID not in ids, ids
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_CLEAN
+            print("B verified-v1 zero-packs -> clean: OK")
+
+            # ---- C. real pack + no capability -> genuine, no sentinel ----------
+            reset_state()
+            set_real_pack()
+            ip = "10.0.0.3"
+            utas_server.fifa17_reset_session(ip)
+            ids = store(ip)
+            assert SENTINEL_ID not in ids, ids
+            assert REAL_PACK_ID in ids, ids
+            print("C real-pack no-capability -> genuine, no sentinel: OK")
+
+            # ---- D. real pack + capability -> genuine, no sentinel -------------
+            reset_state()
+            set_real_pack()
+            ip = "10.0.0.4"
+            utas_server.fifa17_reset_session(ip)
+            register(ip, 1)
+            ids = store(ip)
+            assert SENTINEL_ID not in ids, ids
+            assert REAL_PACK_ID in ids, ids
+            print("D real-pack capability -> genuine, no sentinel: OK")
+
+            # ---- E. unsupported version -> 400 AND mode sentinel ---------------
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.0.5"
+            utas_server.fifa17_reset_session(ip)
+            for bad in (2, 99):
+                st, body = register(ip, bad)
+                assert st == 400 and "error" in body, (bad, st, body)
+            # nothing recorded -> resolver stays None
+            assert utas_server._FIFA17_STORE[ip]["resolver"] is None
+            ids = store(ip)
+            assert SENTINEL_ID in ids, ids
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_SENTINEL
+            # a bad capability string with the right version is also rejected
+            st, body = utas_server.fifa17_capability_route(_H("10.0.0.55", {
+                "capability": "something_else", "version": 1}))
+            assert st == 400, (st, body)
+            print("E unsupported version -> 400 + sentinel: OK")
+
+            # ---- F. late capability after sentinel freeze -> stays sentinel ----
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.0.6"
+            utas_server.fifa17_reset_session(ip)
+            ids = store(ip)                       # freeze: sentinel
+            assert SENTINEL_ID in ids, ids
+            register(ip, 1)                       # arrives late; ignored for session
+            ids = store(ip)
+            assert SENTINEL_ID in ids, "late capability must not flip a frozen sentinel"
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_SENTINEL
+            print("F late capability after sentinel freeze -> sentinel: OK")
+
+            # ---- G. capability disappears after clean freeze -> stays clean ----
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.0.7"
+            utas_server.fifa17_reset_session(ip)
+            register(ip, 1)
+            ids = store(ip)                       # freeze: clean
+            assert SENTINEL_ID not in ids, ids
+            utas_server._FIFA17_STORE[ip]["resolver"] = None   # capability vanishes
+            ids = store(ip)
+            assert SENTINEL_ID not in ids, "frozen clean mode must be immutable"
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_CLEAN
+            print("G capability disappears after clean freeze -> clean: OK")
+
+            # ---- H. two concurrent IPs -> no global leak -----------------------
+            reset_state()
+            set_zero_packs()
+            ip_a, ip_b = "10.0.1.1", "10.0.1.2"
+            utas_server.fifa17_reset_session(ip_a)
+            utas_server.fifa17_reset_session(ip_b)
+            register(ip_a, 1)                     # A verified, B never registers
+            ids_a = store(ip_a)
+            ids_b = store(ip_b)
+            assert SENTINEL_ID not in ids_a, ids_a
+            assert SENTINEL_ID in ids_b, ids_b
+            assert utas_server._FIFA17_STORE[ip_a]["mode"] == utas_server.FIFA17_MODE_CLEAN
+            assert utas_server._FIFA17_STORE[ip_b]["mode"] == utas_server.FIFA17_MODE_SENTINEL
+            print("H concurrent IPs (A clean, B sentinel) -> no global leak: OK")
+
+            # ---- I. reset clears capability across sessions --------------------
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.2.1"
+            utas_server.fifa17_reset_session(ip)
+            register(ip, 1)
+            ids = store(ip)                       # session 1: clean
+            assert SENTINEL_ID not in ids, ids
+            utas_server.fifa17_reset_session(ip)  # relaunch: fresh unpatched process
+            assert utas_server._FIFA17_STORE[ip] == {"resolver": None, "mode": None}
+            ids = store(ip)                       # session 2: no re-register -> sentinel
+            assert SENTINEL_ID in ids, "capability must not leak across sessions"
+            print("I new session clears capability -> sentinel: OK")
+
+            # ---- J. autopatch mismatch => never registers -> sentinel ----------
+            reset_state()
+            set_zero_packs()
+            ip = "10.0.3.1"
+            utas_server.fifa17_reset_session(ip)  # autopatch verify FAILED: no register
+            ids = store(ip)
+            assert SENTINEL_ID in ids, ids
+            assert utas_server._FIFA17_STORE[ip]["mode"] == utas_server.FIFA17_MODE_SENTINEL
+            print("J autopatch mismatch (never registers) -> sentinel: OK")
+        finally:
+            utas_server.visible_unopened_packs = _orig_visible
+
+    print("capability negotiation matrix A-J: OK")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

fifa17-recon/tools/utas_server.py

@@ -11,7 +11,7 @@ Rules (from CardsDLL 0x18016D230 / 0x1801a33a0):
   * body must parse as JSON (else err 0x3E6); 204 + empty body is accepted.
   * [resp+0x1c] == 0 is the success test; 404 is OK only on the first user GET.
 """
-import copy, datetime, json, os, random, re, sys, http.server
+import copy, datetime, json, os, random, re, sys, threading, http.server
 from urllib.parse import parse_qs, urlencode, urlsplit, urlunsplit
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
@@ -52,6 +52,65 @@ def visible_unopened_packs():
     return STORE.unopened_packs() + list(_OPENED_PACK_GRACE)
 
 
+# ---- FIFA17 empty-My-Packs capability negotiation (per-IP, session-stable) ----
+# The synthetic 65534 sentinel (store_catalog) is the universal P2 fallback. It is
+# suppressed for a session ONLY when the launcher has registered that the CURRENT
+# FIFA process positively verified the CardsDLL resolver guard (RVA 0x14858 == JG).
+# Verification is per-FIFA-process; the backend binds it to the peer IP and freezes
+# a per-session decision at the first /store/purchasegroup. Fail-closed: any unknown
+# / late / absent / wrong-version capability resolves to the active sentinel.
+# See docs/plans/FIFA17_PATCHED_CLIENT_CAPABILITY.md (§7/§9/§11).
+FIFA17_EMPTY_MYPACKS_RESOLVER_VERSION = 1
+FIFA17_MODE_SENTINEL = "sentinel"
+FIFA17_MODE_CLEAN = "clean-v1"
+_FIFA17_STORE = {}                       # ip -> {"resolver": Optional[int], "mode": Optional[str]}
+_FIFA17_STORE_LOCK = threading.Lock()
+
+
+def _fifa17_client_ip(h):
+    """Peer IP for the request handler, or None when unavailable (e.g. h is None)."""
+    try:
+        return h.client_address[0]
+    except Exception:
+        return None
+
+
+def fifa17_reset_session(ip):
+    """Session boundary (/openfut/account/sync): clear capability + unfreeze mode."""
+    with _FIFA17_STORE_LOCK:
+        _FIFA17_STORE[ip] = {"resolver": None, "mode": None}
+
+
+def fifa17_register_capability(ip, version):
+    """Register a verified resolver capability for ip. Returns the current mode.
+
+    If the session's mode is already frozen, the capability is logged as late and
+    ignored for this session (mode is immutable after the first store request)."""
+    with _FIFA17_STORE_LOCK:
+        rec = _FIFA17_STORE.setdefault(ip, {"resolver": None, "mode": None})
+        rec["resolver"] = version
+        if rec["mode"] is not None:
+            log("[fifa17-store] capability arrived after mode freeze; ignored for "
+                "current session (ip %s)" % ip)
+        return rec["mode"]
+
+
+def fifa17_empty_mypacks_mode(ip):
+    """Resolve (and freeze on first call) the empty-My-Packs mode for ip.
+
+    Freeze point = first /store/purchasegroup: clean-v1 iff a matching-version
+    resolver capability is already registered, else the sentinel fallback."""
+    with _FIFA17_STORE_LOCK:
+        rec = _FIFA17_STORE.setdefault(ip, {"resolver": None, "mode": None})
+        if rec["mode"] is None:
+            rec["mode"] = (FIFA17_MODE_CLEAN
+                           if rec["resolver"] == FIFA17_EMPTY_MYPACKS_RESOLVER_VERSION
+                           else FIFA17_MODE_SENTINEL)
+            log("[fifa17-store] session %s empty-mypacks mode frozen: %s"
+                % (ip, rec["mode"]))
+        return rec["mode"]
+
+
 def now():
     return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
 
@@ -198,6 +257,12 @@ def auth_body(h=None):
 
 def account_sync_route(h):
     """Launcher-only active-profile selection, before LSX/Blaze login starts."""
+    # Session boundary: each launcher account-sync starts a fresh per-IP FIFA17
+    # capability session (unfreeze mode + clear any prior capability). A new FIFA
+    # process must re-verify; nothing leaks across processes.
+    ip = _fifa17_client_ip(h)
+    fifa17_reset_session(ip)
+    log("    ACCOUNT: reset FIFA17 empty-mypacks capability session for ip %s" % ip)
     try:
         body = json.loads(h._body.decode("utf-8")) if getattr(h, "_body", b"") else {}
         account = activate_account(body)
@@ -209,6 +274,33 @@ def account_sync_route(h):
     return 200, {"account": account, "status": "OK"}
 
 
+def fifa17_capability_route(h):
+    """POST /openfut/fifa17/capability -- launcher registers a verified resolver
+    capability for the current FIFA process (bound to the peer IP). Fail-closed:
+    anything but capability==empty_mypacks_resolver && version==current is a 400
+    that records NOTHING (the session stays on the sentinel fallback)."""
+    try:
+        body = json.loads(h._body.decode("utf-8")) if getattr(h, "_body", b"") else {}
+    except Exception:
+        return 400, {"error": "unsupported capability"}
+    if not isinstance(body, dict):
+        return 400, {"error": "unsupported capability"}
+    try:
+        version = int(body.get("version"))
+    except (TypeError, ValueError):
+        return 400, {"error": "unsupported capability"}
+    if (body.get("capability") != "empty_mypacks_resolver"
+            or version != FIFA17_EMPTY_MYPACKS_RESOLVER_VERSION):
+        return 400, {"error": "unsupported capability"}
+    ip = _fifa17_client_ip(h)
+    fifa17_register_capability(ip, version)
+    persona = body.get("personaId", "?")
+    fifa_pid = body.get("fifaPid", "?")
+    log("[fifa17-store] registered capability empty_mypacks_resolver=%s for %s "
+        "(persona %s, fifa_pid %s)" % (version, ip, persona, fifa_pid))
+    return 200, {"status": "OK"}
+
+
 def current_squad():
     """The squad the client should see: the persisted one (item refs re-embedded
     from the club) or the seed ladder squad on first run.
@@ -1203,6 +1295,10 @@ ROUTES = [
     # Launcher control-plane endpoint. It is intentionally outside /ut so FIFA
     # never calls it; launch is blocked unless this succeeds first.
     (re.compile(r"^/openfut/account/sync$"),          lambda m, h: account_sync_route(h)),
+    # Launcher registers a verified per-FIFA-process resolver capability (bound to
+    # peer IP). Adjacent to account/sync, above the generic /ut routes; FIFA never
+    # calls it. Fail-closed: absent/late/wrong-version => sentinel (store_catalog).
+    (re.compile(r"^/openfut/fifa17/capability$"),     lambda m, h: fifa17_capability_route(h)),
     # ---- FUT item-definition endpoints (must precede generic /item, /user) ----
     (re.compile(G + r"/item/resource"),              lambda m, h: defs_route(h)),
     (re.compile(G + r"/defid"),                      lambda m, h: defs_route(h)),
@@ -3426,43 +3522,54 @@ def store_catalog(h):
         if owned:
             packs.append(_pack_body(owned, idx, owned=True))
     if not owned_ids:
-        # EMPTY MY PACKS -- FIFA 17 client-compatibility workaround (bug 6c, P2).
+        # ADDITIVE capability switch (see docs/plans/FIFA17_PATCHED_CLIENT_CAPABILITY.md
-        #
+        # §7/§9). This is the session-freeze point: the empty-mypacks decision for
-        # The Store/Scaleform path RESOLVES the `mypacks` category even when the
+        # this peer IP is committed here at the first /store/purchasegroup and is
-        # account owns zero unopened packs (the category is chosen client-side from
+        # immutable for the session thereafter.
-        # the movie's CATEGORY_ID -> screen+0x290; no server field gates it).
+        mode = fifa17_empty_mypacks_mode(_fifa17_client_ip(h))
-        # CardsDLL FUN_1800147f0 then dereferences the resolved group with NO null
+        if mode == FIFA17_MODE_CLEAN:
-        # guard, so if no `mypacks` group exists the client CRASHES
+            # Verified patched client: emit NO mypacks group; the CardsDLL resolver
-        # (CardsDLL_Win64_retail.dll+0x14882, read of [NULL+0x48] -- confirmed by
+            # guard (RVA 0x14858 JG) routes the -1 ordinal to Browse instead of
-        # minidump). We therefore MUST emit a `mypacks` group when empty.
+            # dereferencing a null group. (append nothing)
-        #
+            pass
-        # state="inactive" avoids the crash but makes the client report the pack
+        else:
-        # unavailable immediately on Store entry and bounce to the Hub. state="active"
+            # EMPTY MY PACKS -- FIFA 17 client-compatibility workaround (bug 6c, P2).
-        # keeps the group structurally valid AND lets the Store open normally; the
+            #
-        # empty tile renders as "0 items" and an explicit open is rejected
+            # The Store/Scaleform path RESOLVES the `mypacks` category even when the
-        # CLIENT-SIDE ("This pack is no longer available") -- it sends NO backend
+            # account owns zero unopened packs (the category is chosen client-side from
-        # request and mutates nothing.
+            # the movie's CATEGORY_ID -> screen+0x290; no server field gates it).
-        #
+            # CardsDLL FUN_1800147f0 then dereferences the resolved group with NO null
-        # id 65534 is deliberately ABSENT from PACK_CATALOG, so pack_by_id() returns
+            # guard, so if no `mypacks` group exists the client CRASHES
-        # None and store_buy()/purchased_items() cannot open it, grant items/coins,
+            # (CardsDLL_Win64_retail.dll+0x14882, read of [NULL+0x48] -- confirmed by
-        # or add it to unopenedPackIds. This is a compatibility shim for FIFA 17
+            # minidump). We therefore MUST emit a `mypacks` group when empty.
-        # client behavior, NOT an EA-authentic empty-My-Packs representation, and it
+            #
-        # is FIFA17-specific (do not lift into game-independent Core). A fully clean
+            # state="inactive" avoids the crash but makes the client report the pack
-        # zero-pack UX requires a client-side fix -- see
+            # unavailable immediately on Store entry and bounce to the Hub. state="active"
-        # docs/plans/FIFA17_EMPTY_MYPACKS_CLIENT_FIX.md and the evidence in
+            # keeps the group structurally valid AND lets the Store open normally; the
-        # docs/evidence/STORE_TILE_6C.md / FIFA17_EMPTY_MYPACKS_CLIENT_CONTRACT.md.
+            # empty tile renders as "0 items" and an explicit open is rejected
-        sentinel = {
+            # CLIENT-SIDE ("This pack is no longer available") -- it sends NO backend
-            "id": 65534,
+            # request and mutates nothing.
-            "name": "",
+            #
-            "price": 0,
+            # id 65534 is deliberately ABSENT from PACK_CATALOG, so pack_by_id() returns
-            "count": 0,
+            # None and store_buy()/purchased_items() cannot open it, grant items/coins,
-            "gold": True,
+            # or add it to unopenedPackIds. This is a compatibility shim for FIFA 17
-            "specialChance": 0.0,
+            # client behavior, NOT an EA-authentic empty-My-Packs representation, and it
-        }
+            # is FIFA17-specific (do not lift into game-independent Core). A fully clean
-        empty = _pack_body(sentinel, 1, owned=True)
+            # zero-pack UX requires a client-side fix -- see
-        empty["state"] = "active"
+            # docs/plans/FIFA17_EMPTY_MYPACKS_CLIENT_FIX.md and the evidence in
-        empty["unopened"] = False
+            # docs/evidence/STORE_TILE_6C.md / FIFA17_EMPTY_MYPACKS_CLIENT_CONTRACT.md.
-        packs.append(empty)
+            sentinel = {
+                "id": 65534,
+                "name": "",
+                "price": 0,
+                "count": 0,
+                "gold": True,
+                "specialChance": 0.0,
+            }
+            empty = _pack_body(sentinel, 1, owned=True)
+            empty["state"] = "active"
+            empty["unopened"] = False
+            packs.append(empty)
     return 200, {"purchase": packs, "timestamp": 1596326400}