fix: ppclock-mcp --allowed-hosts 空串按 None 处理(空白名单自锁 localhost 421)
空串逗号拆分得空列表,TransportSecuritySettings(allowed_hosts=[]) 启用 DNS 重绑定防护后连 localhost 族一并 421。main() 解析层抽出 _parse_allowed_hosts,空列表以 or None 归一,保持 mcp 默认;含回归测试。 Co-Authored-By: Claude <noreply@anthropic.com>
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@@ -119,3 +119,11 @@ class TestAllowedHosts:
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def test_evil_host_421(self):
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r = self._initialize(self._make_app(), "evil.example.com")
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assert r.status_code == 421
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def test_empty_string_allowed_hosts_to_none(self):
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"""回归:`--allowed-hosts ""` 空串自锁——逗号拆分结果为空列表时须按
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None 处理(保持 mcp 默认 localhost 族),否则空白名单启用防护后
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连 localhost 请求也被 421。"""
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from ppclock.mcp_server import _parse_allowed_hosts
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a = parse_args(["--allowed-hosts", ""])
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assert _parse_allowed_hosts(a.allowed_hosts) is None
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