adding token verification

config/test.exs

@@ -3,7 +3,7 @@ use Mix.Config
 config :ueberauth, Ueberauth,
   json_library: Jason,
   providers: [
-    auth0: {Ueberauth.Strategy.Auth0, []}
+    auth0: {Ueberauth.Strategy.Auth0, [signer_module: SpecSignerModule]}
   ]
 
 config :ueberauth, Ueberauth.Strategy.Auth0.OAuth,

lib/ueberauth/strategy/auth0.ex

@@ -149,7 +149,7 @@ defmodule Ueberauth.Strategy.Auth0 do
           conn
           |> put_private(:auth0_token, client.token)
           |> put_private(:auth0_state, state)
-          |> parse_user_and_put_private(client)
+          |> verify_token_and_put_private(client)
         end
 
       {:error, client} ->
@@ -171,25 +171,21 @@ defmodule Ueberauth.Strategy.Auth0 do
     |> put_private(:auth0_token, nil)
   end
 
-  defp parse_user_and_put_private(conn, %{
-         serializers: serializers,
-         token: %{other_params: %{"id_token" => id_token}}
-       }) do
-    %{"application/json" => json_library} = serializers
-
-    [_header, payload, _signature] = String.split(id_token, ".")
-    user = payload |> Base.decode64!(padding: false) |> json_library.decode!()
-
-    if Map.has_key?(user, "sub") do
-      conn
-      |> put_private(:auth0_user, user)
-    else
-      set_errors!(conn, [
-        error(
-          "invalid_id_token",
-          "Subject (sub) claim must be a string present in the ID token"
-        )
-      ])
+  defp verify_token_and_put_private(conn, %{token: %{other_params: %{"id_token" => id_token}}}) do
+    signer_module = option(conn, :signer_module)
+    signer = signer_module.get()
+
+    case Joken.Signer.verify(id_token, signer) do
+      {:ok, user} ->
+        put_private(conn, :auth0_user, user)
+
+      {:error, _error} ->
+        set_errors!(conn, [
+          error(
+            "failed_token_verification",
+            "Could not validate token"
+          )
+        ])
     end
   end
 
@@ -282,7 +278,7 @@ defmodule Ueberauth.Strategy.Auth0 do
     default = Keyword.get(default_options(), key)
 
     conn
-    |> options
+    |> options()
     |> Keyword.get(key, default)
   end
 

lib/ueberauth/strategy/auth0/signing_key_fetcher.ex

@@ -0,0 +1,3 @@
+defmodule Ueberauth.Strategy.Auth0.SignerFetcher do
+  @callback get() :: binary()
+end

mix.exs

@@ -46,6 +46,7 @@ defmodule UeberauthAuth0.Mixfile do
     [
       {:ueberauth, "~> 0.10"},
       {:oauth2, "~> 2.0"},
+      {:joken, "~> 2.5"},
 
       # Docs:
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},

mix.lock

@@ -15,6 +15,8 @@
   "hackney": {:hex, :hackney, "1.18.1", "f48bf88f521f2a229fc7bae88cf4f85adc9cd9bcf23b5dc8eb6a1788c662c4f6", [:rebar3], [{:certifi, "~>2.9.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~>6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~>1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~>1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "a4ecdaff44297e9b5894ae499e9a070ea1888c84afdd1fd9b7b2bc384950128e"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
   "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
+  "joken": {:hex, :joken, "2.6.0", "b9dd9b6d52e3e6fcb6c65e151ad38bf4bc286382b5b6f97079c47ade6b1bcc6a", [:mix], [{:jose, "~> 1.11.5", [hex: :jose, repo: "hexpm", optional: false]}], "hexpm", "5a95b05a71cd0b54abd35378aeb1d487a23a52c324fa7efdffc512b655b5aaa7"},
+  "jose": {:hex, :jose, "1.11.5", "3bc2d75ffa5e2c941ca93e5696b54978323191988eb8d225c2e663ddfefd515e", [:mix, :rebar3], [], "hexpm", "dcd3b215bafe02ea7c5b23dafd3eb8062a5cd8f2d904fd9caa323d37034ab384"},
   "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm", "fc3499fed7a726995aa659143a248534adc754ebd16ccd437cd93b649a95091f"},
   "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.0", "f8c570a0d33f8039513fbccaf7108c5d750f47d8defd44088371191b76492b0b", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "28b2cbdc13960a46ae9a8858c4bebdec3c9a6d7b4b9e7f4ed1502f8159f338e7"},
@@ -23,13 +25,15 @@
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
   "mime": {:hex, :mime, "2.0.3", "3676436d3d1f7b81b5a2d2bd8405f412c677558c81b1c92be58c00562bb59095", [:mix], [], "hexpm", "27a30bf0db44d25eecba73755acf4068cbfe26a4372f9eb3e4ea3a45956bff6b"},
   "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm", "f278585650aa581986264638ebf698f8bb19df297f66ad91b18910dfc6e19323"},
+  "mix_test_watch": {:hex, :mix_test_watch, "1.1.0", "330bb91c8ed271fe408c42d07e0773340a7938d8a0d281d57a14243eae9dc8c3", [:mix], [{:file_system, "~> 0.2.1 or ~> 0.3", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "52b6b1c476cbb70fd899ca5394506482f12e5f6b0d6acff9df95c7f1e0812ec3"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.2.3", "244836e6e3f1200c7f30cb56733fd808744eca61fd182f731eac4af635cc6d0b", [:mix], [], "hexpm", "c8d789e39b9131acf7b99291e93dae60ab48ef14a7ee9d58c6964f59efb570b0"},
   "oauth2": {:hex, :oauth2, "2.0.1", "70729503e05378697b958919bb2d65b002ba6b28c8112328063648a9348aaa3f", [:mix], [{:hackney, "~> 1.13", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "c64e20d4d105bcdbcbe03170fb530d0eddc3a3e6b135a87528a22c8aecf74c52"},
   "parse_trans": {:hex, :parse_trans, "3.3.1", "16328ab840cc09919bd10dab29e431da3af9e9e7e7e6f0089dd5a2d2820011d8", [:rebar3], [], "hexpm", "07cd9577885f56362d414e8c4c4e6bdf10d43a8767abb92d24cbe8b24c54888b"},
-  "plug": {:hex, :plug, "1.13.6", "187beb6b67c6cec50503e940f0434ea4692b19384d47e5fdfd701e93cadb4cc2", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "02b9c6b9955bce92c829f31d6284bf53c591ca63c4fb9ff81dfd0418667a34ff"},
+  "plug": {:hex, :plug, "1.14.0", "ba4f558468f69cbd9f6b356d25443d0b796fbdc887e03fa89001384a9cac638f", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "bf020432c7d4feb7b3af16a0c2701455cbbbb95e5b6866132cb09eb0c29adc14"},
   "plug_crypto": {:hex, :plug_crypto, "1.2.3", "8f77d13aeb32bfd9e654cb68f0af517b371fb34c56c9f2b58fe3df1235c1251a", [:mix], [], "hexpm", "b5672099c6ad5c202c45f5a403f21a3411247f164e4a8fab056e5cd8a290f4a2"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.6", "cf344f5692c82d2cd7554f5ec8fd961548d4fd09e7d22f5b62482e5aeaebd4b0", [:make, :mix, :rebar3], [], "hexpm", "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680"},
-  "telemetry": {:hex, :telemetry, "1.1.0", "a589817034a27eab11144ad24d5c0f9fab1f58173274b1e9bae7074af9cbee51", [:rebar3], [], "hexpm", "b727b2a1f75614774cff2d7565b64d0dfa5bd52ba517f16543e6fc7efcc0df48"},
+  "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
+  "tesla": {:hex, :tesla, "1.5.0", "7ee3616be87024a2b7231ae14474310c9b999c3abb1f4f8dbc70f86bd9678eef", [:mix], [{:castore, "~> 0.1", [hex: :castore, repo: "hexpm", optional: true]}, {:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: true]}, {:finch, "~> 0.13", [hex: :finch, repo: "hexpm", optional: true]}, {:fuse, "~> 2.4", [hex: :fuse, repo: "hexpm", optional: true]}, {:gun, "~> 1.3", [hex: :gun, repo: "hexpm", optional: true]}, {:hackney, "~> 1.6", [hex: :hackney, repo: "hexpm", optional: true]}, {:ibrowse, "4.4.0", [hex: :ibrowse, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: true]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.0", [hex: :mint, repo: "hexpm", optional: true]}, {:msgpax, "~> 2.3", [hex: :msgpax, repo: "hexpm", optional: true]}, {:poison, ">= 1.0.0", [hex: :poison, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm", "1d0385e41fbd76af3961809088aef15dec4c2fdaab97b1c93c6484cb3695a122"},
   "ueberauth": {:hex, :ueberauth, "0.10.3", "4a3bd7ab7b5d93d301d264f0f6858392654ee92171f4437d067d1ae227c051d9", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "1394f36a6c64e97f2038cf95228e7e52b4cb75417962e30418fbe9902b30e6d3"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
 }

test/fixtures/auth0.json

@@ -1,24 +0,0 @@
-{
-  "sub": "auth0|lyy5v452u345tbn943qf",
-  "name": "Jane Josephine Doe",
-  "given_name": "Jane",
-  "family_name": "Doe",
-  "middle_name": "Josephine",
-  "nickname": "JJ",
-  "preferred_username": "j.doe",
-  "profile": "http://example.com/janedoe",
-  "picture": "http://example.com/janedoe/me.jpg",
-  "website": "http://example.com",
-  "email": "[email protected]",
-  "email_verified": true,
-  "gender": "female",
-  "birthdate": "1972-03-31",
-  "zoneinfo": "America/Los_Angeles",
-  "locale": "en-US",
-  "phone_number": "+1 (111) 222-3434",
-  "phone_number_verified": false,
-  "address": {
-    "country": "us"
-  },
-  "updated_at": "1556845729"
-}