From 6aa65b68b82c8ad7f6246dc5ccf1ac7673ce3e22 Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Fri, 31 Aug 2018 03:13:59 +0000 Subject: [PATCH 1/2] common api: add support for formatting messages outside of twitter-style plain text --- lib/pleroma/formatter.ex | 6 +++- lib/pleroma/web/common_api/common_api.ex | 9 ++++- lib/pleroma/web/common_api/utils.ex | 34 ++++++++++++++++--- .../web/twitter_api/twitter_api_controller.ex | 2 +- mix.exs | 1 + mix.lock | 1 + 6 files changed, 46 insertions(+), 7 deletions(-) diff --git a/lib/pleroma/formatter.ex b/lib/pleroma/formatter.ex index cf2944c38..93cd12fa6 100644 --- a/lib/pleroma/formatter.ex +++ b/lib/pleroma/formatter.ex @@ -188,7 +188,11 @@ defmodule Pleroma.Formatter do ] # TODO: make it use something other than @link_regex - def html_escape(text) do + def html_escape(text, "text/html") do + HtmlSanitizeEx.basic_html(text) + end + + def html_escape(text, "text/plain") do Regex.split(@link_regex, text, include_captures: true) |> Enum.map_every(2, fn chunk -> {:safe, part} = Phoenix.HTML.html_escape(chunk) diff --git a/lib/pleroma/web/common_api/common_api.ex b/lib/pleroma/web/common_api/common_api.ex index 125c57d05..2ab50c968 100644 --- a/lib/pleroma/web/common_api/common_api.ex +++ b/lib/pleroma/web/common_api/common_api.ex @@ -85,7 +85,14 @@ defmodule Pleroma.Web.CommonAPI do {to, cc} <- to_for_user_and_mentions(user, mentions, inReplyTo, visibility), tags <- Formatter.parse_tags(status, data), content_html <- - make_content_html(status, mentions, attachments, tags, data["no_attachment_links"]), + make_content_html( + status, + mentions, + attachments, + tags, + data["content_type"] || "text/plain", + data["no_attachment_links"] + ), context <- make_context(inReplyTo), cw <- data["spoiler_text"], object <- diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex index 358ca22ac..667027c02 100644 --- a/lib/pleroma/web/common_api/utils.ex +++ b/lib/pleroma/web/common_api/utils.ex @@ -63,9 +63,16 @@ defmodule Pleroma.Web.CommonAPI.Utils do end end - def make_content_html(status, mentions, attachments, tags, no_attachment_links \\ false) do + def make_content_html( + status, + mentions, + attachments, + tags, + content_type, + no_attachment_links \\ false + ) do status - |> format_input(mentions, tags) + |> format_input(mentions, tags, content_type) |> maybe_add_attachments(attachments, no_attachment_links) end @@ -92,9 +99,9 @@ defmodule Pleroma.Web.CommonAPI.Utils do Enum.join([text | attachment_text], "
") end - def format_input(text, mentions, tags) do + def format_input(text, mentions, tags, "text/plain") do text - |> Formatter.html_escape() + |> Formatter.html_escape("text/plain") |> String.replace(~r/\r?\n/, "
") |> (&{[], &1}).() |> Formatter.add_links() @@ -103,6 +110,25 @@ defmodule Pleroma.Web.CommonAPI.Utils do |> Formatter.finalize() end + def format_input(text, mentions, tags, "text/html") do + text + |> Formatter.html_escape("text/html") + |> String.replace(~r/\r?\n/, "
") + |> (&{[], &1}).() + |> Formatter.add_user_links(mentions) + |> Formatter.finalize() + end + + def format_input(text, mentions, tags, "text/markdown") do + text + |> Earmark.as_html!() + |> Formatter.html_escape("text/html") + |> String.replace(~r/\r?\n/, "") + |> (&{[], &1}).() + |> Formatter.add_user_links(mentions) + |> Formatter.finalize() + end + def add_tag_links(text, tags) do tags = tags diff --git a/lib/pleroma/web/twitter_api/twitter_api_controller.ex b/lib/pleroma/web/twitter_api/twitter_api_controller.ex index b3a56b27e..244d31dda 100644 --- a/lib/pleroma/web/twitter_api/twitter_api_controller.ex +++ b/lib/pleroma/web/twitter_api/twitter_api_controller.ex @@ -423,7 +423,7 @@ defmodule Pleroma.Web.TwitterAPI.Controller do {String.trim(name, ":"), url} end) - bio_html = CommonUtils.format_input(bio, mentions, tags) + bio_html = CommonUtils.format_input(bio, mentions, tags, "text/plain") Map.put(params, "bio", bio_html |> Formatter.emojify(emoji)) else params diff --git a/mix.exs b/mix.exs index 6b95eeec3..95049cc8c 100644 --- a/mix.exs +++ b/mix.exs @@ -48,6 +48,7 @@ defmodule Pleroma.Mixfile do {:mogrify, "~> 0.6.1"}, {:ex_aws, "~> 2.0"}, {:ex_aws_s3, "~> 2.0"}, + {:earmark, "~> 1.2"}, {:ex_machina, "~> 2.2", only: :test}, {:credo, "~> 0.9.3", only: [:dev, :test]}, {:mock, "~> 0.3.1", only: :test} diff --git a/mix.lock b/mix.lock index 989a97add..cb35a9fab 100644 --- a/mix.lock +++ b/mix.lock @@ -10,6 +10,7 @@ "credo": {:hex, :credo, "0.9.3", "76fa3e9e497ab282e0cf64b98a624aa11da702854c52c82db1bf24e54ab7c97a", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:poison, ">= 0.0.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"}, "db_connection": {:hex, :db_connection, "1.1.3", "89b30ca1ef0a3b469b1c779579590688561d586694a3ce8792985d4d7e575a61", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, repo: "hexpm", optional: false]}, {:poolboy, "~> 1.5", [hex: :poolboy, repo: "hexpm", optional: true]}, {:sbroker, "~> 1.0", [hex: :sbroker, repo: "hexpm", optional: true]}], "hexpm"}, "decimal": {:hex, :decimal, "1.5.0", "b0433a36d0e2430e3d50291b1c65f53c37d56f83665b43d79963684865beab68", [:mix], [], "hexpm"}, + "earmark": {:hex, :earmark, "1.2.6", "b6da42b3831458d3ecc57314dff3051b080b9b2be88c2e5aa41cd642a5b044ed", [:mix], [], "hexpm"}, "ecto": {:hex, :ecto, "2.2.10", "e7366dc82f48f8dd78fcbf3ab50985ceeb11cb3dc93435147c6e13f2cda0992e", [:mix], [{:db_connection, "~> 1.1", [hex: :db_connection, repo: "hexpm", optional: true]}, {:decimal, "~> 1.2", [hex: :decimal, repo: "hexpm", optional: false]}, {:mariaex, "~> 0.8.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: true]}, {:poolboy, "~> 1.5", [hex: :poolboy, repo: "hexpm", optional: false]}, {:postgrex, "~> 0.13.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:sbroker, "~> 1.0", [hex: :sbroker, repo: "hexpm", optional: true]}], "hexpm"}, "eternal": {:hex, :eternal, "1.2.0", "e2a6b6ce3b8c248f7dc31451aefca57e3bdf0e48d73ae5043229380a67614c41", [:mix], [], "hexpm"}, "ex_aws": {:hex, :ex_aws, "2.1.0", "b92651527d6c09c479f9013caa9c7331f19cba38a650590d82ebf2c6c16a1d8a", [:mix], [{:configparser_ex, "~> 2.0", [hex: :configparser_ex, repo: "hexpm", optional: true]}, {:hackney, "1.6.3 or 1.6.5 or 1.7.1 or 1.8.6 or ~> 1.9", [hex: :hackney, repo: "hexpm", optional: true]}, {:jsx, "~> 2.8", [hex: :jsx, repo: "hexpm", optional: true]}, {:poison, ">= 1.2.0", [hex: :poison, repo: "hexpm", optional: true]}, {:sweet_xml, "~> 0.6", [hex: :sweet_xml, repo: "hexpm", optional: true]}, {:xml_builder, "~> 0.1.0", [hex: :xml_builder, repo: "hexpm", optional: true]}], "hexpm"}, From e7871ed05e9ebc8e2fe2f1afe966285e767c682f Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Fri, 31 Aug 2018 03:34:56 +0000 Subject: [PATCH 2/2] tests: add tests for evil HTML filtering --- test/web/common_api/common_api_test.exs | 32 +++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/test/web/common_api/common_api_test.exs b/test/web/common_api/common_api_test.exs index 2a2c40833..cd5aca961 100644 --- a/test/web/common_api/common_api_test.exs +++ b/test/web/common_api/common_api_test.exs @@ -21,4 +21,36 @@ defmodule Pleroma.Web.CommonAPI.Test do assert karjalanpiirakka["name"] == ":karjalanpiirakka:" end + + describe "posting" do + test "it filters out obviously bad tags when accepting a post as HTML" do + user = insert(:user) + + post = "

2hu

" + + {:ok, activity} = + CommonAPI.post(user, %{ + "status" => post, + "content_type" => "text/html" + }) + + content = activity.data["object"]["content"] + assert content == "

2hu

alert('xss')" + end + + test "it filters out obviously bad tags when accepting a post as Markdown" do + user = insert(:user) + + post = "

2hu

" + + {:ok, activity} = + CommonAPI.post(user, %{ + "status" => post, + "content_type" => "text/markdown" + }) + + content = activity.data["object"]["content"] + assert content == "

2hu

alert('xss')" + end + end end