87 lines
2.6 KiB
Elixir
87 lines
2.6 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.MFA.TOTP do
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@moduledoc """
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This module represents functions to create secrets for
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TOTP Application as well as validate them with a time based token.
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"""
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alias Pleroma.Config
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@config_ns [:instance, :multi_factor_authentication, :totp]
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@doc """
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https://github.com/google/google-authenticator/wiki/Key-Uri-Format
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"""
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def provisioning_uri(secret, label, opts \\ []) do
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query =
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%{
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secret: secret,
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issuer: Keyword.get(opts, :issuer, default_issuer()),
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digits: Keyword.get(opts, :digits, default_digits()),
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period: Keyword.get(opts, :period, default_period())
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}
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|> Enum.filter(fn {_, v} -> not is_nil(v) end)
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|> Enum.into(%{})
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|> URI.encode_query()
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%URI{scheme: "otpauth", host: "totp", path: "/" <> label, query: query}
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|> URI.to_string()
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end
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defp default_period, do: Config.get(@config_ns ++ [:period])
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defp default_digits, do: Config.get(@config_ns ++ [:digits])
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defp default_issuer,
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do: Config.get(@config_ns ++ [:issuer], Config.get([:instance, :name]))
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@doc "Creates a random Base 32 encoded string"
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def generate_secret do
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Base.encode32(:crypto.strong_rand_bytes(10))
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end
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@doc "Generates a valid token based on a secret"
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def generate_token(secret) do
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:pot.totp(secret)
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end
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@doc """
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Validates a given token based on a secret.
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optional parameters:
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`token_length` default `6`
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`interval_length` default `30`
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`window` default 0
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Returns {:ok, :pass} if the token is valid and
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{:error, :invalid_token} if it is not.
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"""
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@spec validate_token(String.t(), String.t()) ::
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{:ok, :pass} | {:error, :invalid_token | :invalid_secret_and_token}
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def validate_token(secret, token)
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when is_binary(secret) and is_binary(token) do
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opts = [
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token_length: default_digits(),
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interval_length: default_period()
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]
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validate_token(secret, token, opts)
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end
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def validate_token(_, _), do: {:error, :invalid_secret_and_token}
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@doc "See `validate_token/2`"
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@spec validate_token(String.t(), String.t(), Keyword.t()) ::
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{:ok, :pass} | {:error, :invalid_token | :invalid_secret_and_token}
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def validate_token(secret, token, options)
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when is_binary(secret) and is_binary(token) do
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case :pot.valid_totp(token, secret, options) do
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true -> {:ok, :pass}
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false -> {:error, :invalid_token}
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end
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end
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def validate_token(_, _, _), do: {:error, :invalid_secret_and_token}
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end
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