fix(email): enforce MCP account owner scope (#5234)

mcp_servers/email_server.py

@@ -58,6 +58,11 @@ def _uid_fetch_rows(data) -> list:
 _ACCOUNT_CACHE: dict = {}  # key = normalized account selector -> config dict
 _MCP_OWNER_ARG = "_odysseus_owner"
 _CURRENT_OWNER: ContextVar[str | None] = ContextVar("email_mcp_owner", default=None)
+_OWNER_ENV_KEYS = ("ODYSSEUS_MCP_EMAIL_OWNER", "ODYSSEUS_EMAIL_OWNER")
+_OWNER_SCOPE_ERROR = (
+    "Error: email MCP requires an authenticated owner or ODYSSEUS_MCP_EMAIL_OWNER "
+    "when owner-scoped email accounts are configured."
+)
 
 
 def _clean_header_value(value) -> str:
@@ -71,13 +76,29 @@ def _db_path() -> Path:
     return Path(APP_DB)
 
 
+def _configured_owner() -> str | None:
+    for key in _OWNER_ENV_KEYS:
+        owner = os.environ.get(key, "").strip()
+        if owner:
+            return owner
+    return None
+
+
 def _current_owner() -> str:
     owner = _CURRENT_OWNER.get()
-    return str(owner or "").strip()
+    return str(owner or _configured_owner() or "").strip()
+
+
+def _account_owner(row: dict) -> str:
+    return str(row.get("owner") or "").strip()
+
+
+def _has_owner_scoped_accounts(rows: list[dict]) -> bool:
+    return any(_account_owner(r) for r in rows)
 
 
 def _account_visible_to_owner(row: dict, owner: str) -> bool:
-    row_owner = str(row.get("owner") or "").strip()
+    row_owner = _account_owner(row)
     if row_owner == owner:
         return True
     if row_owner:
@@ -96,8 +117,7 @@ def _filter_accounts_for_owner(rows: list[dict]) -> list[dict]:
     if owner:
         return [r for r in rows if _account_visible_to_owner(r, owner)]
 
-    owners = {str(r.get("owner") or "").strip() for r in rows if str(r.get("owner") or "").strip()}
+    if _has_owner_scoped_accounts(rows):
-    if len(owners) > 1:
         return []
     return rows
 
@@ -106,8 +126,7 @@ def _mcp_owner_required(rows: list[dict] | None = None) -> bool:
     if _current_owner():
         return False
     rows = rows if rows is not None else _read_accounts_from_db()
-    owners = {str(r.get("owner") or "").strip() for r in rows if str(r.get("owner") or "").strip()}
+    return _has_owner_scoped_accounts(rows)
-    return len(owners) > 1
 
 
 def _load_email_writing_style() -> str:
@@ -274,6 +293,8 @@ def _load_config(account: str | None = None) -> dict:
     }
 
     raw_rows = _read_accounts_from_db()
+    if _mcp_owner_required(raw_rows):
+        raise ValueError(_OWNER_SCOPE_ERROR)
     rows = _filter_accounts_for_owner(raw_rows)
     row = _resolve_account_from_rows(rows, account)
     if _current_owner() and raw_rows and not rows:
@@ -1193,10 +1214,14 @@ def _send_email(to, subject, body, in_reply_to=None, references=None, cc=None, b
     UI. This closes the auto-send hole that let earlier models invent
     signatures and ship them to real recipients without confirmation."""
     if _read_agent_email_confirm_setting():
+        # Even confirmation-first sends must resolve the selected account now.
+        # Otherwise a caller could stage a pending draft against another
+        # owner's account selector before browser approval handles it.
+        cfg = _load_config(account)
         return _stash_agent_draft(
             to=to, subject=subject, body=body,
             in_reply_to=in_reply_to, references=references,
-            cc=cc, bcc=bcc, account=account,
+            cc=cc, bcc=bcc, account=cfg.get("account_id") or account,
         )
     send_account, cfg = _resolve_send_config(account)
     msg = EmailMessage()
@@ -2142,10 +2167,7 @@ async def call_tool(name: str, arguments: dict) -> list[TextContent]:
     try:
         all_db_accounts = _read_accounts_from_db()
         if _mcp_owner_required(all_db_accounts):
-            return [TextContent(
+            return [TextContent(type="text", text=_OWNER_SCOPE_ERROR)]
-                type="text",
-                text="Error: email MCP requires an authenticated owner when multiple email account owners are configured.",
-            )]
 
         if name == "list_email_accounts":
             rows = _filter_accounts_for_owner(all_db_accounts)

tests/test_mcp_email_decode_header_spaces.py

@@ -16,7 +16,20 @@ pytest.importorskip("mcp")
 import mcp_servers.email_server as es
 
 
-def _init_accounts_db(path):
+@pytest.fixture(autouse=True)
+def _clear_mcp_email_owner_env(monkeypatch):
+    for key in es._OWNER_ENV_KEYS:
+        monkeypatch.delenv(key, raising=False)
+    es._ACCOUNT_CACHE.clear()
+    yield
+    es._ACCOUNT_CACHE.clear()
+
+
+def _init_accounts_db(path, rows=None):
+    rows = rows or [
+        ("acct-alice", "alice", "Alice Mail", 1, "alice@example.com", "alice@example.com", "alice@example.com", "2026-01-01"),
+        ("acct-bob", "bob", "Bob Mail", 1, "bob@example.com", "bob@example.com", "bob@example.com", "2026-01-02"),
+    ]
     conn = sqlite3.connect(path)
     conn.execute(
         """
@@ -50,10 +63,7 @@ def _init_accounts_db(path):
         VALUES (?, ?, ?, ?, 1, 'imap.example.com', 993, ?, '', 1,
                 'smtp.example.com', 465, 'ssl', ?, '', ?, ?)
         """,
-        [
+        rows,
-            ("acct-alice", "alice", "Alice Mail", 1, "alice@example.com", "alice@example.com", "alice@example.com", "2026-01-01"),
-            ("acct-bob", "bob", "Bob Mail", 1, "bob@example.com", "bob@example.com", "bob@example.com", "2026-01-02"),
-        ],
     )
     conn.commit()
     conn.close()
@@ -106,6 +116,37 @@ async def test_mcp_email_requires_owner_when_multiple_account_owners_exist(tmp_p
     assert "requires an authenticated owner" in out[0].text
 
 
+@pytest.mark.asyncio
+async def test_mcp_email_requires_owner_when_any_account_owner_exists(tmp_path, monkeypatch):
+    db_path = tmp_path / "app.db"
+    _init_accounts_db(
+        db_path,
+        rows=[
+            ("acct-alice", "alice", "Alice Mail", 1, "alice@example.com", "alice@example.com", "alice@example.com", "2026-01-01"),
+        ],
+    )
+    monkeypatch.setattr(es, "APP_DB", str(db_path))
+
+    out = await es.call_tool("list_email_accounts", {})
+
+    assert "requires an authenticated owner" in out[0].text
+    assert "Alice Mail" not in out[0].text
+
+
+@pytest.mark.asyncio
+async def test_mcp_email_configured_owner_filters_accounts(tmp_path, monkeypatch):
+    db_path = tmp_path / "app.db"
+    _init_accounts_db(db_path)
+    monkeypatch.setattr(es, "APP_DB", str(db_path))
+    monkeypatch.setenv("ODYSSEUS_MCP_EMAIL_OWNER", "alice")
+
+    out = await es.call_tool("list_email_accounts", {})
+    text = out[0].text
+
+    assert "Alice Mail" in text
+    assert "Bob Mail" not in text
+
+
 def test_mcp_email_scoped_owner_without_visible_account_skips_legacy_fallback(tmp_path, monkeypatch):
     db_path = tmp_path / "app.db"
     settings_path = tmp_path / "settings.json"
@@ -137,11 +178,81 @@ def test_mcp_email_scoped_owner_without_visible_account_skips_legacy_fallback(tm
         es._ACCOUNT_CACHE.clear()
 
 
+@pytest.mark.asyncio
+async def test_mcp_email_owner_cannot_use_other_owner_account_for_list_read_send_or_draft(tmp_path, monkeypatch):
+    import src.constants as constants
+
+    db_path = tmp_path / "app.db"
+    scheduled_path = tmp_path / "scheduled_emails.db"
+    _init_accounts_db(db_path)
+    monkeypatch.setattr(es, "APP_DB", str(db_path))
+    monkeypatch.setattr(constants, "SCHEDULED_EMAILS_DB", str(scheduled_path))
+    monkeypatch.setattr(es, "_read_agent_email_confirm_setting", lambda: True)
+
+    calls = [
+        ("list_emails", {"account": "Bob Mail"}),
+        ("read_email", {"uid": "1", "account": "Bob Mail"}),
+        ("send_email", {
+            "to": "recipient@example.com",
+            "subject": "Blocked",
+            "body": "Do not stage.",
+            "account": "Bob Mail",
+        }),
+        ("draft_email", {
+            "to": "recipient@example.com",
+            "subject": "Blocked",
+            "body": "Do not draft.",
+            "account": "Bob Mail",
+        }),
+    ]
+
+    for tool_name, args in calls:
+        out = await es.call_tool(tool_name, {**args, "_odysseus_owner": "alice"})
+        assert "Email account not found for selector" in out[0].text, tool_name
+        assert "Bob Mail" not in out[0].text or "Available accounts" in out[0].text
+
+    assert not scheduled_path.exists()
+
+
+@pytest.mark.asyncio
+async def test_mcp_send_email_stages_with_visible_owner_account_id(tmp_path, monkeypatch):
+    import src.constants as constants
+
+    app_db_path = tmp_path / "app.db"
+    scheduled_path = tmp_path / "scheduled_emails.db"
+    _init_accounts_db(app_db_path)
+    monkeypatch.setattr(es, "APP_DB", str(app_db_path))
+    monkeypatch.setattr(constants, "SCHEDULED_EMAILS_DB", str(scheduled_path))
+    monkeypatch.setattr(es, "_read_agent_email_confirm_setting", lambda: True)
+
+    out = await es.call_tool(
+        "send_email",
+        {
+            "to": "recipient@example.com",
+            "subject": "Review",
+            "body": "Please review.",
+            "account": "Alice Mail",
+            "_odysseus_owner": "alice",
+        },
+    )
+
+    assert "Draft staged for approval" in out[0].text
+    conn = sqlite3.connect(scheduled_path)
+    try:
+        row = conn.execute(
+            "SELECT owner, status, account_id FROM scheduled_emails"
+        ).fetchone()
+    finally:
+        conn.close()
+    assert row == ("alice", "agent_draft", "acct-alice")
+
+
 @pytest.mark.asyncio
 async def test_mcp_send_email_stages_owner_scoped_pending_draft(tmp_path, monkeypatch):
     import src.constants as constants
 
     db_path = tmp_path / "scheduled_emails.db"
+    monkeypatch.setattr(es, "APP_DB", str(tmp_path / "missing-app.db"))
     monkeypatch.setattr(constants, "SCHEDULED_EMAILS_DB", str(db_path))
     monkeypatch.setattr(es, "_read_agent_email_confirm_setting", lambda: True)