Graham McIntire
833de33622
unpkg.com fetches were intermittently failing in production, leaving the /sites-map page without a working map. Vendoring Leaflet (JS, CSS, marker/layer images) under priv/static/vendor/leaflet/ removes the runtime CDN dependency, the matching CSP relaxation, and the SRI hash churn on future updates. Add 'vendor' to ToweropsWeb.static_paths/0 so Plug.Static serves the new tree, and revert script-src/style-src to no longer list unpkg.com. connect-src still allows *.tile.openstreetmap.org for tile fetches.
40 lines
1.2 KiB
Elixir
40 lines
1.2 KiB
Elixir
defmodule ToweropsWeb.Plugs.SecurityHeaders do
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@moduledoc """
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Adds security headers to all responses.
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Headers added:
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- Content-Security-Policy: Restricts resource loading to prevent XSS
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- X-Frame-Options: Prevents clickjacking attacks
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- X-Content-Type-Options: Prevents MIME type sniffing
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- Referrer-Policy: Controls referrer information leakage
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- Permissions-Policy: Disables browsing-topics API
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"""
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import Plug.Conn
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def init(opts), do: opts
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def call(conn, _opts) do
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conn
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|> put_resp_header("permissions-policy", "browsing-topics=()")
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|> put_resp_header("content-security-policy", csp_header())
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|> put_resp_header("x-frame-options", "DENY")
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|> put_resp_header("x-content-type-options", "nosniff")
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|> put_resp_header("referrer-policy", "strict-origin-when-cross-origin")
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end
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defp csp_header do
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Enum.join(
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[
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"default-src 'self' data:",
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"script-src 'self' 'unsafe-inline' https://a.w5isp.com",
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"style-src 'self' 'unsafe-inline' 'unsafe-hashes'",
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"img-src 'self' data: https:",
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"font-src 'self' data:",
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"connect-src 'self' ws: wss: https://a.w5isp.com https://*.tile.openstreetmap.org",
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"frame-ancestors 'none'"
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],
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"; "
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)
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end
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end
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