Short circuit user verification if cookie is present.

This commit is contained in:
Roger Braun 2017-03-30 15:29:49 +02:00
parent e1525edbe8
commit 32aa83f3a2
2 changed files with 60 additions and 9 deletions

View File

@ -8,20 +8,28 @@ def init(options) do
def call(conn, opts) do def call(conn, opts) do
with {:ok, username, password} <- decode_header(conn), with {:ok, username, password} <- decode_header(conn),
{:ok, user} <- opts[:fetcher].(username), {:ok, user} <- opts[:fetcher].(username),
{:ok, verified_user} <- verify(user, password) saved_user_id <- get_session(conn, :user_id),
{:ok, verified_user} <- verify(user, password, saved_user_id)
do do
conn |> assign(:user, verified_user) conn
|> assign(:user, verified_user)
|> put_session(:user_id, verified_user.id)
else else
_ -> conn |> halt_or_continue(opts) _ -> conn |> halt_or_continue(opts)
end end
end end
defp verify(nil, _password) do # Short-circuit if we have a cookie with the id for the given user.
defp verify(%{id: id} = user, _password, id) do
{:ok, user}
end
defp verify(nil, _password, _user_id) do
Comeonin.Pbkdf2.dummy_checkpw Comeonin.Pbkdf2.dummy_checkpw
:error :error
end end
defp verify(user, password) do defp verify(user, password, _user_id) do
if Comeonin.Pbkdf2.checkpw(password, user.password_hash) do if Comeonin.Pbkdf2.checkpw(password, user.password_hash) do
{:ok, user} {:ok, user}
else else

View File

@ -13,6 +13,12 @@ defp fetch_nil(_name) do
password_hash: Comeonin.Pbkdf2.hashpwsalt("guy") password_hash: Comeonin.Pbkdf2.hashpwsalt("guy")
} }
@session_opts [
store: :cookie,
key: "_test",
signing_salt: "cooldude"
]
defp fetch_user(_name) do defp fetch_user(_name) do
{:ok, @user} {:ok, @user}
end end
@ -23,14 +29,20 @@ defp basic_auth_enc(username, password) do
describe "without an authorization header" do describe "without an authorization header" do
test "it halts the application" do test "it halts the application" do
conn = build_conn() |> AuthenticationPlug.call(%{}) conn = build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> AuthenticationPlug.call(%{})
assert conn.status == 403 assert conn.status == 403
assert conn.halted == true assert conn.halted == true
end end
test "it assigns a nil user if the 'optional' option is used" do test "it assigns a nil user if the 'optional' option is used" do
conn = build_conn() |> AuthenticationPlug.call(%{optional: true}) conn = build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> AuthenticationPlug.call(%{optional: true})
assert %{ user: nil } == conn.assigns assert %{ user: nil } == conn.assigns
end end
@ -40,6 +52,8 @@ test "it assigns a nil user if the 'optional' option is used" do
test "it halts the application" do test "it halts the application" do
conn = conn =
build_conn() build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> AuthenticationPlug.call(%{fetcher: &fetch_nil/1}) |> AuthenticationPlug.call(%{fetcher: &fetch_nil/1})
assert conn.status == 403 assert conn.status == 403
@ -49,6 +63,8 @@ test "it halts the application" do
test "it assigns a nil user if the 'optional' option is used" do test "it assigns a nil user if the 'optional' option is used" do
conn = conn =
build_conn() build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> AuthenticationPlug.call(%{optional: true, fetcher: &fetch_nil/1 }) |> AuthenticationPlug.call(%{optional: true, fetcher: &fetch_nil/1 })
assert %{ user: nil } == conn.assigns assert %{ user: nil } == conn.assigns
@ -65,6 +81,8 @@ test "it halts the application" do
conn = conn =
build_conn() build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> put_req_header("authorization", header) |> put_req_header("authorization", header)
|> AuthenticationPlug.call(opts) |> AuthenticationPlug.call(opts)
@ -82,6 +100,8 @@ test "it assigns a nil user if the 'optional' option is used" do
conn = conn =
build_conn() build_conn()
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> put_req_header("authorization", header) |> put_req_header("authorization", header)
|> AuthenticationPlug.call(opts) |> AuthenticationPlug.call(opts)
@ -90,7 +110,7 @@ test "it assigns a nil user if the 'optional' option is used" do
end end
describe "with a correct authorization header for an existing user" do describe "with a correct authorization header for an existing user" do
test "it assigns the user" do test "it assigns the user", %{conn: conn} do
opts = %{ opts = %{
optional: true, optional: true,
fetcher: &fetch_user/1 fetcher: &fetch_user/1
@ -98,12 +118,35 @@ test "it assigns the user" do
header = basic_auth_enc("dude", "guy") header = basic_auth_enc("dude", "guy")
conn = conn = conn
build_conn() |> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> put_req_header("authorization", header) |> put_req_header("authorization", header)
|> AuthenticationPlug.call(opts) |> AuthenticationPlug.call(opts)
assert %{ user: @user } == conn.assigns assert %{ user: @user } == conn.assigns
assert get_session(conn, :user_id) == @user.id
assert conn.halted == false
end
end
describe "with a user_id in the session for an existing user" do
test "it assigns the user", %{conn: conn} do
opts = %{
optional: true,
fetcher: &fetch_user/1
}
header = basic_auth_enc("dude", "THIS IS WRONG")
conn = conn
|> Plug.Session.call(Plug.Session.init(@session_opts))
|> fetch_session
|> put_session(:user_id, @user.id)
|> put_req_header("authorization", header)
|> AuthenticationPlug.call(opts)
assert %{ user: @user } == conn.assigns
assert get_session(conn, :user_id) == @user.id
assert conn.halted == false assert conn.halted == false
end end
end end