Merge branch 'fix/mediaproxy-bypass-emoji' into 'develop'

Fix profile emojis bypassing mediaproxy and harden CSP

Closes #1810

See merge request pleroma/pleroma!2596
This commit is contained in:
rinpatch 2020-05-29 09:46:31 +00:00
commit 396bc69aee
5 changed files with 106 additions and 43 deletions

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@ -31,7 +31,7 @@ defp headers do
{"x-content-type-options", "nosniff"},
{"referrer-policy", referrer_policy},
{"x-download-options", "noopen"},
{"content-security-policy", csp_string() <> ";"}
{"content-security-policy", csp_string()}
]
if report_uri do
@ -43,23 +43,46 @@ defp headers do
]
}
headers ++ [{"reply-to", Jason.encode!(report_group)}]
[{"reply-to", Jason.encode!(report_group)} | headers]
else
headers
end
end
static_csp_rules = [
"default-src 'none'",
"base-uri 'self'",
"frame-ancestors 'none'",
"style-src 'self' 'unsafe-inline'",
"font-src 'self'",
"manifest-src 'self'"
]
@csp_start [Enum.join(static_csp_rules, ";") <> ";"]
defp csp_string do
scheme = Config.get([Pleroma.Web.Endpoint, :url])[:scheme]
static_url = Pleroma.Web.Endpoint.static_url()
websocket_url = Pleroma.Web.Endpoint.websocket_url()
report_uri = Config.get([:http_security, :report_uri])
connect_src = "connect-src 'self' #{static_url} #{websocket_url}"
img_src = "img-src 'self' data: blob:"
media_src = "media-src 'self'"
{img_src, media_src} =
if Config.get([:media_proxy, :enabled]) &&
!Config.get([:media_proxy, :proxy_opts, :redirect_on_failure]) do
sources = get_proxy_and_attachment_sources()
{[img_src, sources], [media_src, sources]}
else
{img_src, media_src}
end
connect_src = ["connect-src 'self' ", static_url, ?\s, websocket_url]
connect_src =
if Pleroma.Config.get(:env) == :dev do
connect_src <> " http://localhost:3035/"
[connect_src, " http://localhost:3035/"]
else
connect_src
end
@ -71,27 +94,46 @@ defp csp_string do
"script-src 'self'"
end
main_part = [
"default-src 'none'",
"base-uri 'self'",
"frame-ancestors 'none'",
"img-src 'self' data: blob: https:",
"media-src 'self' https:",
"style-src 'self' 'unsafe-inline'",
"font-src 'self'",
"manifest-src 'self'",
connect_src,
script_src
]
report = if report_uri, do: ["report-uri ", report_uri, ";report-to csp-endpoint"]
insecure = if scheme == "https", do: "upgrade-insecure-requests"
report = if report_uri, do: ["report-uri #{report_uri}; report-to csp-endpoint"], else: []
insecure = if scheme == "https", do: ["upgrade-insecure-requests"], else: []
(main_part ++ report ++ insecure)
|> Enum.join("; ")
@csp_start
|> add_csp_param(img_src)
|> add_csp_param(media_src)
|> add_csp_param(connect_src)
|> add_csp_param(script_src)
|> add_csp_param(insecure)
|> add_csp_param(report)
|> :erlang.iolist_to_binary()
end
defp get_proxy_and_attachment_sources do
media_proxy_whitelist =
Enum.reduce(Config.get([:media_proxy, :whitelist]), [], fn host, acc ->
add_source(acc, host)
end)
upload_base_url =
if Config.get([Pleroma.Upload, :base_url]),
do: URI.parse(Config.get([Pleroma.Upload, :base_url])).host
s3_endpoint =
if Config.get([Pleroma.Upload, :uploader]) == Pleroma.Uploaders.S3,
do: URI.parse(Config.get([Pleroma.Uploaders.S3, :public_endpoint])).host
[]
|> add_source(upload_base_url)
|> add_source(s3_endpoint)
|> add_source(media_proxy_whitelist)
end
defp add_source(iodata, nil), do: iodata
defp add_source(iodata, source), do: [[?\s, source] | iodata]
defp add_csp_param(csp_iodata, nil), do: csp_iodata
defp add_csp_param(csp_iodata, param), do: [[param, ?;] | csp_iodata]
def warn_if_disabled do
unless Config.get([:http_security, :enabled]) do
Logger.warn("

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@ -182,12 +182,14 @@ defp do_render("show.json", %{user: user} = opts) do
bot = user.actor_type in ["Application", "Service"]
emojis =
Enum.map(user.emoji, fn {shortcode, url} ->
Enum.map(user.emoji, fn {shortcode, raw_url} ->
url = MediaProxy.url(raw_url)
%{
"shortcode" => shortcode,
"url" => url,
"static_url" => url,
"visible_in_picker" => false
shortcode: shortcode,
url: url,
static_url: url,
visible_in_picker: false
}
end)

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@ -67,7 +67,7 @@ test "it sends `report-to` & `report-uri` CSP response headers" do
[csp] = Conn.get_resp_header(conn, "content-security-policy")
assert csp =~ ~r|report-uri https://endpoint.com; report-to csp-endpoint;|
assert csp =~ ~r|report-uri https://endpoint.com;report-to csp-endpoint;|
[reply_to] = Conn.get_resp_header(conn, "reply-to")

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@ -54,10 +54,10 @@ test "Represent a user account" do
header_static: "http://localhost:4001/images/banner.png",
emojis: [
%{
"static_url" => "/file.png",
"url" => "/file.png",
"shortcode" => "karjalanpiirakka",
"visible_in_picker" => false
static_url: "/file.png",
url: "/file.png",
shortcode: "karjalanpiirakka",
visible_in_picker: false
}
],
fields: [],
@ -491,4 +491,31 @@ test "shows non-zero when historical unapproved requests are present" do
AccountView.render("show.json", %{user: user, for: user})
end
end
test "uses mediaproxy urls when it's enabled" do
clear_config([:media_proxy, :enabled], true)
user =
insert(:user,
avatar: %{"url" => [%{"href" => "https://evil.website/avatar.png"}]},
banner: %{"url" => [%{"href" => "https://evil.website/banner.png"}]},
emoji: %{"joker_smile" => "https://evil.website/society.png"}
)
AccountView.render("show.json", %{user: user})
|> Enum.all?(fn
{key, url} when key in [:avatar, :avatar_static, :header, :header_static] ->
String.starts_with?(url, Pleroma.Web.base_url())
{:emojis, emojis} ->
Enum.all?(emojis, fn %{url: url, static_url: static_url} ->
String.starts_with?(url, Pleroma.Web.base_url()) &&
String.starts_with?(static_url, Pleroma.Web.base_url())
end)
_ ->
true
end)
|> assert()
end
end

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@ -124,15 +124,7 @@ test "encoded url are tried to match for proxy as `conn.request_path` encodes th
end
test "uses the configured base_url" do
base_url = Pleroma.Config.get([:media_proxy, :base_url])
if base_url do
on_exit(fn ->
Pleroma.Config.put([:media_proxy, :base_url], base_url)
end)
end
Pleroma.Config.put([:media_proxy, :base_url], "https://cache.pleroma.social")
clear_config([:media_proxy, :base_url], "https://cache.pleroma.social")
url = "https://pleroma.soykaf.com/static/logo.png"
encoded = url(url)
@ -213,8 +205,8 @@ test "mediaproxy whitelist" do
end
test "does not change whitelisted urls" do
Pleroma.Config.put([:media_proxy, :whitelist], ["mycdn.akamai.com"])
Pleroma.Config.put([:media_proxy, :base_url], "https://cache.pleroma.social")
clear_config([:media_proxy, :whitelist], ["mycdn.akamai.com"])
clear_config([:media_proxy, :base_url], "https://cache.pleroma.social")
media_url = "https://mycdn.akamai.com"