spc-pleroma/lib/pleroma/web/oauth/oauth_controller.ex

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.OAuth.OAuthController do
use Pleroma.Web, :controller
alias Pleroma.Registration
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.Auth.Authenticator
alias Pleroma.Web.ControllerHelper
alias Pleroma.Web.OAuth.App
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alias Pleroma.Web.OAuth.Authorization
alias Pleroma.Web.OAuth.Token
alias Pleroma.Web.OAuth.Token.Strategy.RefreshToken
alias Pleroma.Web.OAuth.Token.Strategy.Revoke, as: RevokeToken
alias Pleroma.Web.OAuth.Scopes
if Pleroma.Config.oauth_consumer_enabled?(), do: plug(Ueberauth)
@expires_in Pleroma.Config.get([:oauth2, :token_expires_in], 600)
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plug(:fetch_session)
plug(:fetch_flash)
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action_fallback(Pleroma.Web.OAuth.FallbackController)
# Note: this definition is only called from error-handling methods with `conn.params` as 2nd arg
def authorize(conn, %{"authorization" => _} = params) do
{auth_attrs, params} = Map.pop(params, "authorization")
authorize(conn, Map.merge(params, auth_attrs))
end
def authorize(%{assigns: %{token: %Token{} = token}} = conn, params) do
if ControllerHelper.truthy_param?(params["force_login"]) do
do_authorize(conn, params)
else
redirect_uri =
if is_binary(params["redirect_uri"]) do
params["redirect_uri"]
else
app = Repo.preload(token, :app).app
app.redirect_uris
|> String.split()
|> Enum.at(0)
end
redirect(conn, external: redirect_uri(conn, redirect_uri))
end
end
def authorize(conn, params), do: do_authorize(conn, params)
defp do_authorize(conn, params) do
app = Repo.get_by(App, client_id: params["client_id"])
available_scopes = (app && app.scopes) || []
scopes = Scopes.fetch_scopes(params, available_scopes)
# Note: `params` might differ from `conn.params`; use `@params` not `@conn.params` in template
render(conn, Authenticator.auth_template(), %{
response_type: params["response_type"],
client_id: params["client_id"],
available_scopes: available_scopes,
scopes: scopes,
redirect_uri: params["redirect_uri"],
state: params["state"],
params: params
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})
end
def create_authorization(
conn,
%{"authorization" => _} = params,
opts \\ []
) do
with {:ok, auth} <- do_create_authorization(conn, params, opts[:user]) do
after_create_authorization(conn, auth, params)
else
error ->
handle_create_authorization_error(conn, error, params)
end
end
def after_create_authorization(conn, auth, %{
"authorization" => %{"redirect_uri" => redirect_uri} = auth_attrs
}) do
redirect_uri = redirect_uri(conn, redirect_uri)
if redirect_uri == "urn:ietf:wg:oauth:2.0:oob" do
render(conn, "results.html", %{
auth: auth
})
else
connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
url = "#{redirect_uri}#{connector}"
url_params = %{:code => auth.token}
url_params =
if auth_attrs["state"] do
Map.put(url_params, :state, auth_attrs["state"])
else
url_params
end
url = "#{url}#{Plug.Conn.Query.encode(url_params)}"
redirect(conn, external: url)
end
end
defp handle_create_authorization_error(
conn,
{:error, scopes_issue},
%{"authorization" => _} = params
)
when scopes_issue in [:unsupported_scopes, :missing_scopes] do
# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L39
conn
|> put_flash(:error, "This action is outside the authorized scopes")
|> put_status(:unauthorized)
|> authorize(params)
end
defp handle_create_authorization_error(
conn,
{:auth_active, false},
%{"authorization" => _} = params
) do
# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
conn
|> put_flash(:error, "Your login is missing a confirmed e-mail address")
|> put_status(:forbidden)
|> authorize(params)
end
defp handle_create_authorization_error(conn, error, %{"authorization" => _}) do
Authenticator.handle_error(conn, error)
end
@doc "Renew access_token with refresh_token"
def token_exchange(
conn,
%{"grant_type" => "refresh_token", "refresh_token" => token} = params
) do
with %App{} = app <- get_app_from_request(conn, params),
{:ok, %{user: user} = token} <- Token.get_by_refresh_token(app, token),
{:ok, token} <- RefreshToken.grant(token) do
response_attrs = %{created_at: Token.Utils.format_created_at(token)}
json(conn, response_token(user, token, response_attrs))
else
_error ->
put_status(conn, 400)
|> json(%{error: "Invalid credentials"})
end
end
def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
with %App{} = app <- get_app_from_request(conn, params),
fixed_token = Token.Utils.fix_padding(params["code"]),
{:ok, auth} <- Authorization.get_by_token(app, fixed_token),
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%User{} = user <- User.get_cached_by_id(auth.user_id),
{:ok, token} <- Token.exchange_token(app, auth) do
response_attrs = %{created_at: Token.Utils.format_created_at(token)}
json(conn, response_token(user, token, response_attrs))
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else
_error ->
put_status(conn, 400)
|> json(%{error: "Invalid credentials"})
end
end
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def token_exchange(
conn,
%{"grant_type" => "password"} = params
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) do
with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
%App{} = app <- get_app_from_request(conn, params),
{:auth_active, true} <- {:auth_active, User.auth_active?(user)},
{:user_active, true} <- {:user_active, !user.info.deactivated},
{:ok, scopes} <- validate_scopes(app, params),
{:ok, auth} <- Authorization.create_authorization(app, user, scopes),
{:ok, token} <- Token.exchange_token(app, auth) do
json(conn, response_token(user, token))
else
{:auth_active, false} ->
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# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
conn
|> put_status(:forbidden)
|> json(%{error: "Your login is missing a confirmed e-mail address"})
{:user_active, false} ->
conn
|> put_status(:forbidden)
|> json(%{error: "Your account is currently disabled"})
_error ->
put_status(conn, 400)
|> json(%{error: "Invalid credentials"})
end
end
def token_exchange(
conn,
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%{"grant_type" => "password", "name" => name, "password" => _password} = params
) do
params =
params
|> Map.delete("name")
|> Map.put("username", name)
token_exchange(conn, params)
end
# Bad request
def token_exchange(conn, params), do: bad_request(conn, params)
def token_revoke(conn, %{"token" => _token} = params) do
with %App{} = app <- get_app_from_request(conn, params),
{:ok, _token} <- RevokeToken.revoke(app, params) do
json(conn, %{})
else
_error ->
# RFC 7009: invalid tokens [in the request] do not cause an error response
json(conn, %{})
end
end
def token_revoke(conn, params), do: bad_request(conn, params)
# Response for bad request
defp bad_request(conn, _) do
conn
|> put_status(500)
|> json(%{error: "Bad request"})
end
@doc "Prepares OAuth request to provider for Ueberauth"
def prepare_request(conn, %{"provider" => provider, "authorization" => auth_attrs}) do
scope =
auth_attrs
|> Scopes.fetch_scopes([])
|> Scopes.to_string()
state =
auth_attrs
|> Map.delete("scopes")
|> Map.put("scope", scope)
|> Poison.encode!()
params =
auth_attrs
|> Map.drop(~w(scope scopes client_id redirect_uri))
|> Map.put("state", state)
# Handing the request to Ueberauth
redirect(conn, to: o_auth_path(conn, :request, provider, params))
end
def request(conn, params) do
message =
if params["provider"] do
"Unsupported OAuth provider: #{params["provider"]}."
else
"Bad OAuth request."
end
conn
|> put_flash(:error, message)
|> redirect(to: "/")
end
def callback(%{assigns: %{ueberauth_failure: failure}} = conn, params) do
params = callback_params(params)
messages = for e <- Map.get(failure, :errors, []), do: e.message
message = Enum.join(messages, "; ")
conn
|> put_flash(:error, "Failed to authenticate: #{message}.")
|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
end
def callback(conn, params) do
params = callback_params(params)
with {:ok, registration} <- Authenticator.get_registration(conn) do
auth_attrs = Map.take(params, ~w(client_id redirect_uri scope scopes state))
case Repo.get_assoc(registration, :user) do
{:ok, user} ->
create_authorization(conn, %{"authorization" => auth_attrs}, user: user)
_ ->
registration_params =
Map.merge(auth_attrs, %{
"nickname" => Registration.nickname(registration),
"email" => Registration.email(registration)
})
conn
|> put_session(:registration_id, registration.id)
|> registration_details(%{"authorization" => registration_params})
end
else
_ ->
conn
|> put_flash(:error, "Failed to set up user account.")
|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
end
end
defp callback_params(%{"state" => state} = params) do
Map.merge(params, Poison.decode!(state))
end
def registration_details(conn, %{"authorization" => auth_attrs}) do
render(conn, "register.html", %{
client_id: auth_attrs["client_id"],
redirect_uri: auth_attrs["redirect_uri"],
state: auth_attrs["state"],
scopes: Scopes.fetch_scopes(auth_attrs, []),
nickname: auth_attrs["nickname"],
email: auth_attrs["email"]
})
end
def register(conn, %{"authorization" => _, "op" => "connect"} = params) do
with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
%Registration{} = registration <- Repo.get(Registration, registration_id),
{_, {:ok, auth}} <-
{:create_authorization, do_create_authorization(conn, params)},
%User{} = user <- Repo.preload(auth, :user).user,
{:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
conn
|> put_session_registration_id(nil)
|> after_create_authorization(auth, params)
else
{:create_authorization, error} ->
{:register, handle_create_authorization_error(conn, error, params)}
_ ->
{:register, :generic_error}
end
end
def register(conn, %{"authorization" => _, "op" => "register"} = params) do
with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
%Registration{} = registration <- Repo.get(Registration, registration_id),
{:ok, user} <- Authenticator.create_from_registration(conn, registration) do
conn
|> put_session_registration_id(nil)
|> create_authorization(
params,
user: user
)
else
{:error, changeset} ->
message =
Enum.map(changeset.errors, fn {field, {error, _}} ->
"#{field} #{error}"
end)
|> Enum.join("; ")
message =
String.replace(
message,
"ap_id has already been taken",
"nickname has already been taken"
)
conn
|> put_status(:forbidden)
|> put_flash(:error, "Error: #{message}.")
|> registration_details(params)
_ ->
{:register, :generic_error}
end
end
defp do_create_authorization(
conn,
%{
"authorization" =>
%{
"client_id" => client_id,
"redirect_uri" => redirect_uri
} = auth_attrs
},
user \\ nil
) do
with {_, {:ok, %User{} = user}} <-
{:get_user, (user && {:ok, user}) || Authenticator.get_user(conn)},
%App{} = app <- Repo.get_by(App, client_id: client_id),
true <- redirect_uri in String.split(app.redirect_uris),
{:ok, scopes} <- validate_scopes(app, auth_attrs),
{:auth_active, true} <- {:auth_active, User.auth_active?(user)} do
Authorization.create_authorization(app, user, scopes)
end
end
defp get_app_from_request(conn, params) do
conn
|> fetch_client_credentials(params)
|> fetch_client
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end
defp fetch_client({id, secret}) when is_binary(id) and is_binary(secret) do
Repo.get_by(App, client_id: id, client_secret: secret)
end
defp fetch_client({_id, _secret}), do: nil
defp fetch_client_credentials(conn, params) do
# Per RFC 6749, HTTP Basic is preferred to body params
with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
{:ok, decoded} <- Base.decode64(encoded),
[id, secret] <-
Enum.map(
String.split(decoded, ":"),
fn s -> URI.decode_www_form(s) end
) do
{id, secret}
else
_ -> {params["client_id"], params["client_secret"]}
end
end
# Special case: Local MastodonFE
defp redirect_uri(conn, "."), do: mastodon_api_url(conn, :login)
defp redirect_uri(_conn, redirect_uri), do: redirect_uri
defp get_session_registration_id(conn), do: get_session(conn, :registration_id)
defp put_session_registration_id(conn, registration_id),
do: put_session(conn, :registration_id, registration_id)
defp response_token(%User{} = user, token, opts \\ %{}) do
%{
token_type: "Bearer",
access_token: token.token,
refresh_token: token.refresh_token,
expires_in: @expires_in,
scope: Enum.join(token.scopes, " "),
me: user.ap_id
}
|> Map.merge(opts)
end
@spec validate_scopes(App.t(), map()) ::
{:ok, list()} | {:error, :missing_scopes | :unsupported_scopes}
defp validate_scopes(app, params) do
params
|> Scopes.fetch_scopes(app.scopes)
|> Scopes.validates(app.scopes)
end
end