Graham McIntire
39e588c686
- Add organization membership check before API token creation - Fix admin security allowlist form reading current_user instead of current_scope.user - Use recursive File.ls instead of Path.wildcard to include hidden files in MIB validation - Add upload size check before ZIP extraction in MIB controller - Centralize CSP in SecurityHeaders plug with per-request nonces instead of 'unsafe-inline'
45 lines
1.4 KiB
Elixir
45 lines
1.4 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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@nonce_bytes 16
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def init(opts), do: opts
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def call(conn, _opts) do
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nonce = @nonce_bytes |> :crypto.strong_rand_bytes() |> Base.encode64(padding: false)
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conn
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|> put_private(:csp_nonce, nonce)
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|> put_resp_header("permissions-policy", "browsing-topics=()")
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|> put_resp_header("content-security-policy", csp_header(nonce))
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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(nonce) 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' 'nonce-#{nonce}' 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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