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Merge branch 'fix/captcha' into 'develop' 

Fix account registration when captcha is enabled but not provided

Closes #1712

See merge request pleroma/pleroma!2438
This commit is contained in:
lain 2020-05-01 11:47:58 +00:00
parent 0dd863f8f5 39a78998d0
commit 2008fa9c7f
11 changed files with 250 additions and 163 deletions
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1
docs/API/differences_in_mastoapi_responses.md
View File

@ -202,4 +202,5 @@ Has theses additional parameters (which are the same as in Pleroma-API):
- `bio`: optional
- `captcha_solution`: optional, contains provider-specific captcha solution,
- `captcha_token`: optional, contains provider-specific captcha token
- `captcha_answer_data`: optional, contains provider-specific captcha data
- `token`: invite token required when the registrations aren't public.

1
lib/pleroma/application.ex
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@ -73,7 +73,6 @@ def start(_type, _args) do
Pleroma.Repo,
Config.TransferTask,
Pleroma.Emoji,
Pleroma.Captcha,
Pleroma.Plugs.RateLimiter.Supervisor
] ++
cachex_children() ++

125
lib/pleroma/captcha/captcha.ex
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@ -3,53 +3,22 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Captcha do
import Pleroma.Web.Gettext
alias Calendar.DateTime
alias Plug.Crypto.KeyGenerator
alias Plug.Crypto.MessageEncryptor
use GenServer
@doc false
def start_link(_) do
GenServer.start_link(__MODULE__, [], name: __MODULE__)
end
@doc false
def init(_) do
{:ok, nil}
end
@doc """
Ask the configured captcha service for a new captcha
"""
def new do
GenServer.call(__MODULE__, :new)
end
@doc """
Ask the configured captcha service to validate the captcha
"""
def validate(token, captcha, answer_data) do
GenServer.call(__MODULE__, {:validate, token, captcha, answer_data})
end
@doc false
def handle_call(:new, _from, state) do
enabled = Pleroma.Config.get([__MODULE__, :enabled])
if !enabled do
{:reply, %{type: :none}, state}
if not enabled?() do
%{type: :none}
else
new_captcha = method().new()
secret_key_base = Pleroma.Config.get!([Pleroma.Web.Endpoint, :secret_key_base])
# This make salt a little different for two keys
token = new_captcha[:token]
secret = KeyGenerator.generate(secret_key_base, token <> "_encrypt")
sign_secret = KeyGenerator.generate(secret_key_base, token <> "_sign")
{secret, sign_secret} = secret_pair(new_captcha[:token])
# Basically copy what Phoenix.Token does here, add the time to
# the actual data and make it a binary to then encrypt it
encrypted_captcha_answer =
@ -60,55 +29,73 @@ def handle_call(:new, _from, state) do
|> :erlang.term_to_binary()
|> MessageEncryptor.encrypt(secret, sign_secret)
{
:reply,
# Replace the answer with the encrypted answer
%{new_captcha | answer_data: encrypted_captcha_answer},
state
}
%{new_captcha | answer_data: encrypted_captcha_answer}
end
end
@doc false
def handle_call({:validate, token, captcha, answer_data}, _from, state) do
@doc """
Ask the configured captcha service to validate the captcha
"""
def validate(token, captcha, answer_data) do
with {:ok, %{at: at, answer_data: answer_md5}} <- validate_answer_data(token, answer_data),
:ok <- validate_expiration(at),
:ok <- validate_usage(token),
:ok <- method().validate(token, captcha, answer_md5),
{:ok, _} <- mark_captcha_as_used(token) do
:ok
end
end
def enabled?, do: Pleroma.Config.get([__MODULE__, :enabled], false)
defp seconds_valid, do: Pleroma.Config.get!([__MODULE__, :seconds_valid])
defp secret_pair(token) do
secret_key_base = Pleroma.Config.get!([Pleroma.Web.Endpoint, :secret_key_base])
secret = KeyGenerator.generate(secret_key_base, token <> "_encrypt")
sign_secret = KeyGenerator.generate(secret_key_base, token <> "_sign")
# If the time found is less than (current_time-seconds_valid) then the time has already passed
# Later we check that the time found is more than the presumed invalidatation time, that means
# that the data is still valid and the captcha can be checked
seconds_valid = Pleroma.Config.get!([Pleroma.Captcha, :seconds_valid])
valid_if_after = DateTime.subtract!(DateTime.now_utc(), seconds_valid)
{secret, sign_secret}
end
defp validate_answer_data(token, answer_data) do
{secret, sign_secret} = secret_pair(token)
result =
with false <- is_nil(answer_data),
{:ok, data} <- MessageEncryptor.decrypt(answer_data, secret, sign_secret),
%{at: at, answer_data: answer_md5} <- :erlang.binary_to_term(data) do
try do
if DateTime.before?(at, valid_if_after),
do: throw({:error, dgettext("errors", "CAPTCHA expired")})
if not is_nil(Cachex.get!(:used_captcha_cache, token)),
do: throw({:error, dgettext("errors", "CAPTCHA already used")})
res = method().validate(token, captcha, answer_md5)
# Throw if an error occurs
if res != :ok, do: throw(res)
# Mark this captcha as used
{:ok, _} =
Cachex.put(:used_captcha_cache, token, true, ttl: :timer.seconds(seconds_valid))
:ok
catch
:throw, e -> e
end
{:ok, %{at: at, answer_data: answer_md5}}
else
_ -> {:error, dgettext("errors", "Invalid answer data")}
_ -> {:error, :invalid_answer_data}
end
end
{:reply, result, state}
defp validate_expiration(created_at) do
# If the time found is less than (current_time-seconds_valid) then the time has already passed
# Later we check that the time found is more than the presumed invalidatation time, that means
# that the data is still valid and the captcha can be checked
valid_if_after = DateTime.subtract!(DateTime.now_utc(), seconds_valid())
if DateTime.before?(created_at, valid_if_after) do
{:error, :expired}
else
:ok
end
end
defp validate_usage(token) do
if is_nil(Cachex.get!(:used_captcha_cache, token)) do
:ok
else
{:error, :already_used}
end
end
defp mark_captcha_as_used(token) do
ttl = seconds_valid() |> :timer.seconds()
Cachex.put(:used_captcha_cache, token, true, ttl: ttl)
end
defp method, do: Pleroma.Config.get!([__MODULE__, :method])

5
lib/pleroma/captcha/kocaptcha.ex
View File

@ -3,7 +3,6 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Captcha.Kocaptcha do
import Pleroma.Web.Gettext
alias Pleroma.Captcha.Service
@behaviour Service
@ -13,7 +12,7 @@ def new do
case Tesla.get(endpoint <> "/new") do
{:error, _} ->
%{error: dgettext("errors", "Kocaptcha service unavailable")}
%{error: :kocaptcha_service_unavailable}
{:ok, res} ->
json_resp = Jason.decode!(res.body)
@ -33,6 +32,6 @@ def validate(_token, captcha, answer_data) do
if not is_nil(captcha) and
:crypto.hash(:md5, captcha) |> Base.encode16() == String.upcase(answer_data),
do: :ok,
else: {:error, dgettext("errors", "Invalid CAPTCHA")}
else: {:error, :invalid}
end
end

5
lib/pleroma/captcha/native.ex
View File

@ -3,7 +3,6 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Captcha.Native do
import Pleroma.Web.Gettext
alias Pleroma.Captcha.Service
@behaviour Service
@ -11,7 +10,7 @@ defmodule Pleroma.Captcha.Native do
def new do
case Captcha.get() do
:error ->
%{error: dgettext("errors", "Captcha error")}
%{error: :captcha_error}
{:ok, answer_data, img_binary} ->
%{
@ -25,7 +24,7 @@ def new do
@impl Service
def validate(_token, captcha, captcha) when not is_nil(captcha), do: :ok
def validate(_token, _captcha, _answer), do: {:error, dgettext("errors", "Invalid CAPTCHA")}
def validate(_token, _captcha, _answer), do: {:error, :invalid}
defp token do
10

24
lib/pleroma/web/mastodon_api/controllers/account_controller.ex
View File

@ -94,24 +94,8 @@ defmodule Pleroma.Web.MastodonAPI.AccountController do
@doc "POST /api/v1/accounts"
def create(%{assigns: %{app: app}, body_params: params} = conn, _params) do
params =
params
|> Map.take([
:email,
:bio,
:captcha_solution,
:captcha_token,
:captcha_answer_data,
:token,
:password,
:fullname
])
|> Map.put(:nickname, params.username)
|> Map.put(:fullname, Map.get(params, :fullname, params.username))
|> Map.put(:confirm, params.password)
|> Map.put(:trusted_app, app.trusted)
with :ok <- validate_email_param(params),
:ok <- TwitterAPI.validate_captcha(app, params),
{:ok, user} <- TwitterAPI.register_user(params, need_confirmation: true),
{:ok, token} <- Token.create_token(app, user, %{scopes: app.scopes}) do
json(conn, %{
@ -121,7 +105,7 @@ def create(%{assigns: %{app: app}, body_params: params} = conn, _params) do
created_at: Token.Utils.format_created_at(token)
})
else
{:error, errors} -> json_response(conn, :bad_request, errors)
{:error, error} -> json_response(conn, :bad_request, %{error: error})
end
end
@ -133,11 +117,11 @@ def create(conn, _) do
render_error(conn, :forbidden, "Invalid credentials")
end
defp validate_email_param(%{:email => email}) when not is_nil(email), do: :ok
defp validate_email_param(%{email: email}) when not is_nil(email), do: :ok
defp validate_email_param(_) do
case Pleroma.Config.get([:instance, :account_activation_required]) do
true -> {:error, %{"error" => "Missing parameters"}}
true -> {:error, dgettext("errors", "Missing parameter: %{name}", name: "email")}
_ -> :ok
end
end

102
lib/pleroma/web/twitter_api/twitter_api.ex
View File

@ -3,55 +3,28 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
import Pleroma.Web.Gettext
alias Pleroma.Emails.Mailer
alias Pleroma.Emails.UserEmail
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.UserInviteToken
require Pleroma.Constants
def register_user(params, opts \\ []) do
params =
params
|> Map.take([
:nickname,
:password,
:captcha_solution,
:captcha_token,
:captcha_answer_data,
:token,
:email,
:trusted_app
])
|> Map.put(:bio, User.parse_bio(params[:bio] || ""))
|> Map.put(:name, params.fullname)
|> Map.put(:password_confirmation, params[:confirm])
|> Map.take([:email, :token, :password])
|> Map.put(:bio, params |> Map.get(:bio, "") |> User.parse_bio())
|> Map.put(:nickname, params[:username])
|> Map.put(:name, Map.get(params, :fullname, params[:username]))
|> Map.put(:password_confirmation, params[:password])
case validate_captcha(params) do
:ok ->
if Pleroma.Config.get([:instance, :registrations_open]) do
create_user(params, opts)
else
create_user_with_invite(params, opts)
end
{:error, error} ->
# I have no idea how this error handling works
{:error, %{error: Jason.encode!(%{captcha: [error]})}}
end
end
defp validate_captcha(params) do
if params[:trusted_app] || not Pleroma.Config.get([Pleroma.Captcha, :enabled]) do
:ok
else
Pleroma.Captcha.validate(
params.captcha_token,
params.captcha_solution,
params.captcha_answer_data
)
end
end
defp create_user_with_invite(params, opts) do
@ -75,16 +48,17 @@ defp create_user(params, opts) do
{:error, changeset} ->
errors =
Ecto.Changeset.traverse_errors(changeset, fn {msg, _opts} -> msg end)
changeset
|> Ecto.Changeset.traverse_errors(fn {msg, _opts} -> msg end)
|> Jason.encode!()
{:error, %{error: errors}}
{:error, errors}
end
end
def password_reset(nickname_or_email) do
with true <- is_binary(nickname_or_email),
%User{local: true, email: email} = user when not is_nil(email) <-
%User{local: true, email: email} = user when is_binary(email) <-
User.get_by_nickname_or_email(nickname_or_email),
{:ok, token_record} <- Pleroma.PasswordResetToken.create_token(user) do
user
@ -106,4 +80,58 @@ def password_reset(nickname_or_email) do
{:error, "unknown user"}
end
end
def validate_captcha(app, params) do
if app.trusted || not Pleroma.Captcha.enabled?() do
:ok
else
do_validate_captcha(params)
end
end
defp do_validate_captcha(params) do
with :ok <- validate_captcha_presence(params),
:ok <-
Pleroma.Captcha.validate(
params[:captcha_token],
params[:captcha_solution],
params[:captcha_answer_data]
) do
:ok
else
{:error, :captcha_error} ->
captcha_error(dgettext("errors", "CAPTCHA Error"))
{:error, :invalid} ->
captcha_error(dgettext("errors", "Invalid CAPTCHA"))
{:error, :kocaptcha_service_unavailable} ->
captcha_error(dgettext("errors", "Kocaptcha service unavailable"))
{:error, :expired} ->
captcha_error(dgettext("errors", "CAPTCHA expired"))
{:error, :already_used} ->
captcha_error(dgettext("errors", "CAPTCHA already used"))
{:error, :invalid_answer_data} ->
captcha_error(dgettext("errors", "Invalid answer data"))
{:error, error} ->
captcha_error(error)
end
end
defp validate_captcha_presence(params) do
[:captcha_solution, :captcha_token, :captcha_answer_data]
|> Enum.find_value(:ok, fn key ->
unless is_binary(params[key]) do
error = dgettext("errors", "Invalid CAPTCHA (Missing parameter: %{name})", name: key)
{:error, error}
end
end)
end
# For some reason FE expects error message to be a serialized JSON
defp captcha_error(error), do: {:error, Jason.encode!(%{captcha: [error]})}
end

7
test/captcha_test.exs
View File

@ -61,7 +61,7 @@ test "new and validate" do
assert is_binary(answer)
assert :ok = Native.validate(token, answer, answer)
assert {:error, "Invalid CAPTCHA"} == Native.validate(token, answer, answer <> "foobar")
assert {:error, :invalid} == Native.validate(token, answer, answer <> "foobar")
end
end
@ -78,6 +78,7 @@ test "validate" do
assert is_binary(answer)
assert :ok = Captcha.validate(token, "63615261b77f5354fb8c4e4986477555", answer)
Cachex.del(:used_captcha_cache, token)
end
test "doesn't validate invalid answer" do
@ -92,7 +93,7 @@ test "doesn't validate invalid answer" do
assert is_binary(answer)
assert {:error, "Invalid answer data"} =
assert {:error, :invalid_answer_data} =
Captcha.validate(token, "63615261b77f5354fb8c4e4986477555", answer <> "foobar")
end
@ -108,7 +109,7 @@ test "nil answer_data" do
assert is_binary(answer)
assert {:error, "Invalid answer data"} =
assert {:error, :invalid_answer_data} =
Captcha.validate(token, "63615261b77f5354fb8c4e4986477555", nil)
end
end

6
test/support/captcha_mock.ex
View File

@ -6,12 +6,16 @@ defmodule Pleroma.Captcha.Mock do
alias Pleroma.Captcha.Service
@behaviour Service
@solution "63615261b77f5354fb8c4e4986477555"
def solution, do: @solution
@impl Service
def new,
do: %{
type: :mock,
token: "afa1815e14e29355e6c8f6b143a39fa2",
answer_data: "63615261b77f5354fb8c4e4986477555",
answer_data: @solution,
url: "https://example.org/captcha.png"
}

88
test/web/mastodon_api/controllers/account_controller_test.exs
View File

@ -925,7 +925,8 @@ test "returns bad_request if missing email params when :account_activation_requi
|> Map.put(:remote_ip, {127, 0, 0, 5})
|> post("/api/v1/accounts", Map.delete(valid_params, :email))
assert json_response_and_validate_schema(res, 400) == %{"error" => "Missing parameters"}
assert json_response_and_validate_schema(res, 400) ==
%{"error" => "Missing parameter: email"}
res =
conn
@ -1093,6 +1094,91 @@ test "respects rate limit setting", %{conn: conn} do
end
end
describe "create account with enabled captcha" do
setup %{conn: conn} do
app_token = insert(:oauth_token, user: nil)
conn =
conn
|> put_req_header("authorization", "Bearer " <> app_token.token)
|> put_req_header("content-type", "multipart/form-data")
[conn: conn]
end
setup do: clear_config([Pleroma.Captcha, :enabled], true)
test "creates an account and returns 200 if captcha is valid", %{conn: conn} do
%{token: token, answer_data: answer_data} = Pleroma.Captcha.new()
params = %{
username: "lain",
email: "lain@example.org",
password: "PlzDontHackLain",
agreement: true,
captcha_solution: Pleroma.Captcha.Mock.solution(),
captcha_token: token,
captcha_answer_data: answer_data
}
assert %{
"access_token" => access_token,
"created_at" => _,
"scope" => ["read"],
"token_type" => "Bearer"
} =
conn
|> post("/api/v1/accounts", params)
|> json_response_and_validate_schema(:ok)
assert Token |> Repo.get_by(token: access_token) |> Repo.preload(:user) |> Map.get(:user)
Cachex.del(:used_captcha_cache, token)
end
test "returns 400 if any captcha field is not provided", %{conn: conn} do
captcha_fields = [:captcha_solution, :captcha_token, :captcha_answer_data]
valid_params = %{
username: "lain",
email: "lain@example.org",
password: "PlzDontHackLain",
agreement: true,
captcha_solution: "xx",
captcha_token: "xx",
captcha_answer_data: "xx"
}
for field <- captcha_fields do
expected = %{
"error" => "{\"captcha\":[\"Invalid CAPTCHA (Missing parameter: #{field})\"]}"
}
assert expected ==
conn
|> post("/api/v1/accounts", Map.delete(valid_params, field))
|> json_response_and_validate_schema(:bad_request)
end
end
test "returns an error if captcha is invalid", %{conn: conn} do
params = %{
username: "lain",
email: "lain@example.org",
password: "PlzDontHackLain",
agreement: true,
captcha_solution: "cofe",
captcha_token: "cofe",
captcha_answer_data: "cofe"
}
assert %{"error" => "{\"captcha\":[\"Invalid answer data\"]}"} ==
conn
|> post("/api/v1/accounts", params)
|> json_response_and_validate_schema(:bad_request)
end
end
describe "GET /api/v1/accounts/:id/lists - account_lists" do
test "returns lists to which the account belongs" do
%{user: user, conn: conn} = oauth_access(["read:lists"])

41
test/web/twitter_api/twitter_api_test.exs
View File

@ -18,7 +18,7 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPITest do
test "it registers a new user and returns the user." do
data = %{
:nickname => "lain",
:username => "lain",
:email => "lain@wired.jp",
:fullname => "lain iwakura",
:password => "bear",
@ -35,7 +35,7 @@ test "it registers a new user and returns the user." do
test "it registers a new user with empty string in bio and returns the user." do
data = %{
:nickname => "lain",
:username => "lain",
:email => "lain@wired.jp",
:fullname => "lain iwakura",
:bio => "",
@ -60,7 +60,7 @@ test "it sends confirmation email if :account_activation_required is specified i
end
data = %{
:nickname => "lain",
:username => "lain",
:email => "lain@wired.jp",
:fullname => "lain iwakura",
:bio => "",
@ -87,7 +87,7 @@ test "it sends confirmation email if :account_activation_required is specified i
test "it registers a new user and parses mentions in the bio" do
data1 = %{
:nickname => "john",
:username => "john",
:email => "john@gmail.com",
:fullname => "John Doe",
:bio => "test",
@ -98,7 +98,7 @@ test "it registers a new user and parses mentions in the bio" do
{:ok, user1} = TwitterAPI.register_user(data1)
data2 = %{
:nickname => "lain",
:username => "lain",
:email => "lain@wired.jp",
:fullname => "lain iwakura",
:bio => "@john test",
@ -123,7 +123,7 @@ test "returns user on success" do
{:ok, invite} = UserInviteToken.create_invite()
data = %{
:nickname => "vinny",
:username => "vinny",
:email => "pasta@pizza.vs",
:fullname => "Vinny Vinesauce",
:bio => "streamer",
@ -145,7 +145,7 @@ test "returns user on success" do
test "returns error on invalid token" do
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -165,7 +165,7 @@ test "returns error on expired token" do
UserInviteToken.update_invite!(invite, used: true)
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -186,7 +186,7 @@ test "returns error on expired token" do
setup do
data = %{
:nickname => "vinny",
:username => "vinny",
:email => "pasta@pizza.vs",
:fullname => "Vinny Vinesauce",
:bio => "streamer",
@ -250,7 +250,7 @@ test "returns user on success, after him registration fails" do
UserInviteToken.update_invite!(invite, uses: 99)
data = %{
:nickname => "vinny",
:username => "vinny",
:email => "pasta@pizza.vs",
:fullname => "Vinny Vinesauce",
:bio => "streamer",
@ -269,7 +269,7 @@ test "returns user on success, after him registration fails" do
AccountView.render("show.json", %{user: fetched_user})
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -292,7 +292,7 @@ test "returns user on success" do
{:ok, invite} = UserInviteToken.create_invite(%{expires_at: Date.utc_today(), max_use: 100})
data = %{
:nickname => "vinny",
:username => "vinny",
:email => "pasta@pizza.vs",
:fullname => "Vinny Vinesauce",
:bio => "streamer",
@ -317,7 +317,7 @@ test "error after max uses" do
UserInviteToken.update_invite!(invite, uses: 99)
data = %{
:nickname => "vinny",
:username => "vinny",
:email => "pasta@pizza.vs",
:fullname => "Vinny Vinesauce",
:bio => "streamer",
@ -335,7 +335,7 @@ test "error after max uses" do
AccountView.render("show.json", %{user: fetched_user})
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -355,7 +355,7 @@ test "returns error on overdue date" do
UserInviteToken.create_invite(%{expires_at: Date.add(Date.utc_today(), -1), max_use: 100})
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -377,7 +377,7 @@ test "returns error on with overdue date and after max" do
UserInviteToken.update_invite!(invite, uses: 100)
data = %{
:nickname => "GrimReaper",
:username => "GrimReaper",
:email => "death@reapers.afterlife",
:fullname => "Reaper Grim",
:bio => "Your time has come",
@ -395,16 +395,15 @@ test "returns error on with overdue date and after max" do
test "it returns the error on registration problems" do
data = %{
:nickname => "lain",
:username => "lain",
:email => "lain@wired.jp",
:fullname => "lain iwakura",
:bio => "close the world.",
:password => "bear"
:bio => "close the world."
}
{:error, error_object} = TwitterAPI.register_user(data)
{:error, error} = TwitterAPI.register_user(data)
assert is_binary(error_object[:error])
assert is_binary(error)
refute User.get_cached_by_nickname("lain")
end