How to set security headers in phoenix live view?

apoorv-2204

How do I set security header for phoenix elixir application.

I used this plug, but its not working.

defmodule Provider.Plugs.SecurityHeaders do
  @moduledoc """
  put response header for security
  """
  import Plug.Conn

  def init(opts), do: opts

  def call(conn, _opts) do
    conn
    |> put_resp_header("x-frame-options", "DENY")
    |> put_resp_header("content-security-policy", "frame-src 'self'; frame-ancestors 'none'")
    |> put_resp_header("x-content-type-options", "nosniff")
    |> put_resp_header("referrer-policy", "no-referrer")
    |> put_resp_header("cross-origin-opener-policy", "same-origin")
    |> put_resp_header("cross-origin-embedder-policy", "unsafe-none")
    |> put_resp_header("cross-origin-resource-policy", "same-origin")
    |> put_resp_header("strict-transport-security", "max-age=31536000; includeSubDomains")
  end
end

pipeline :browser do
    plug(:accepts, ["html"])
    plug(:fetch_session)
    # plug :fetch_flash
    plug(:fetch_live_flash)
    plug(:put_root_layout, {Provider.LayoutView, :root})
    plug(:protect_from_forgery)
    plug(:put_secure_browser_headers)
    plug(:load_information)
    plug(:fetch_current_user)
    plug(Provider.Plugs.CSP)
    plug(Provider.Plugs.SecurityHeaders)
  end

7 comments

/phoenix #security #liveview

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2025-01-06 16:19:20 UTC

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benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

Can you elaborate on what this means? What did you expect to have happen, and what did happen?

Post #1

apoorv-2204

Security headers are not being sent with the response.

It means security headers are not being set

Post #2

apoorv-2204

I just want to set HTTP security headers for the phoenix application how do i do that?

Post #3

hubertlepicki

You, sir or madam, need to work on your communication skills. You will not receive help if you’re unable to express yourself and describe the problem.

Post #4

absowoot

Have a look at the documentation for put_secure_browser_headers.

A custom headers map may also be given to be merged with defaults. It is recommended for custom header keys to be in lowercase, to avoid sending duplicate keys in a request. Additionally, responses with mixed-case headers served over HTTP/2 are not considered valid by common clients, resulting in dropped responses.

pipeline :browser do
    ...
    plug :put_secure_browser_headers,
    %{
         "content-security-policy" =>
         "frame-src 'self'; frame-ancestors 'none'"
     }
end

Post #5

apoorv-2204

But I have a seperate plug for putting csp.

But I want to put http security headers

X-Content-Type-Options: nosniff
Cross-Origin-Embedder-Policy
Cross-Origin-Opener-Policy:

etc.
I am currently using a plug,which puts response headers on incoming request from browser,
Is this the correct way to do it?
what is the correct way to set the security headers apart from CSP.

Post #6