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Adds protection against CSRF on authorization flow #73

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Adds protection against CSRF on authorization flow #73

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322b884
Adds protection against CSRF on authorization flow
GPrimola Feb 10, 2026
50ad3ef
allowing state as parameter with autheticity verification
GPrimola Feb 18, 2026
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8 changes: 2 additions & 6 deletions lib/oidcc/plug/authorize.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,6 @@ defmodule Oidcc.Plug.Authorize do
]
end
```

## Query Params

* `state` - State to relay to OpenID Provider. Commonly used for target redirect
URL after authorization.
"""
@moduledoc since: "0.1.0"

Expand Down Expand Up @@ -103,7 +98,8 @@ defmodule Oidcc.Plug.Authorize do
redirect_uri = opts |> Keyword.fetch!(:redirect_uri) |> evaluate_config()
client_profile_opts = Keyword.get(opts, :client_profile_opts, %{profiles: []})

state = Map.get(params, "state", :undefined)
state_authenticity = 31 |> :crypto.strong_rand_bytes() |> Base.url_encode64(padding: false)
state = state_authenticity <> Map.get(params, "state", "")
state_verifier = :erlang.phash2(state)

nonce = 31 |> :crypto.strong_rand_bytes() |> Base.url_encode64(padding: false)
Expand Down