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Merge remote-tracking branch 'upstream/develop' into spc2

This commit is contained in:
Moon Man 2024-05-22 18:30:08 +00:00
parent 428d6e34b5 05b9805bf9
commit 9d23feeb87
10 changed files with 270 additions and 116 deletions
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1
changelog.d/fix-webfinger-spoofing.security Normal file
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@ -0,0 +1 @@
Fix webfinger spoofing.

1
changelog.d/webfinger-validation.fix Normal file
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@ -0,0 +1 @@
Fix validate_webfinger when running a different domain for Webfinger

3
lib/pleroma/application.ex
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@ -162,7 +162,8 @@ defp cachex_children do
expiration: chat_message_id_idempotency_key_expiration(),
limit: 500_000
),
build_cachex("rel_me", limit: 2500)
build_cachex("rel_me", limit: 2500),
build_cachex("host_meta", default_ttl: :timer.minutes(120), limit: 5000)
]
end

38
lib/pleroma/web/web_finger.ex
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@ -155,7 +155,16 @@ def get_template_from_xml(body) do
end
end
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
def find_lrdd_template(domain) do
@cachex.fetch!(:host_meta_cache, domain, fn _ ->
{:commit, fetch_lrdd_template(domain)}
end)
rescue
e -> {:error, "Cachex error: #{inspect(e)}"}
end
defp fetch_lrdd_template(domain) do
# WebFinger is restricted to HTTPS - https://tools.ietf.org/html/rfc7033#section-9.1
meta_url = "https://#{domain}/.well-known/host-meta"
@ -168,7 +177,7 @@ def find_lrdd_template(domain) do
end
end
defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do
defp get_address_from_domain(domain, "acct:" <> _ = encoded_account) when is_binary(domain) do
case find_lrdd_template(domain) do
{:ok, template} ->
String.replace(template, "{uri}", encoded_account)
@ -178,6 +187,11 @@ defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do
end
end
defp get_address_from_domain(domain, account) when is_binary(domain) do
encoded_account = URI.encode("acct:#{account}")
get_address_from_domain(domain, encoded_account)
end
defp get_address_from_domain(_, _), do: {:error, :webfinger_no_domain}
@spec finger(String.t()) :: {:ok, map()} | {:error, any()}
@ -192,9 +206,7 @@ def finger(account) do
URI.parse(account).host
end
encoded_account = URI.encode("acct:#{account}")
with address when is_binary(address) <- get_address_from_domain(domain, encoded_account),
with address when is_binary(address) <- get_address_from_domain(domain, account),
{:ok, %{status: status, body: body, headers: headers}} when status in 200..299 <-
HTTP.get(
address,
@ -216,10 +228,28 @@ def finger(account) do
_ ->
{:error, {:content_type, nil}}
end
|> case do
{:ok, data} -> validate_webfinger(address, data)
error -> error
end
else
error ->
Logger.debug("Couldn't finger #{account}: #{inspect(error)}")
error
end
end
defp validate_webfinger(request_url, %{"subject" => "acct:" <> acct = subject} = data) do
with [_name, acct_host] <- String.split(acct, "@"),
{_, url} <- {:address, get_address_from_domain(acct_host, subject)},
%URI{host: request_host} <- URI.parse(request_url),
%URI{host: acct_host} <- URI.parse(url),
{_, true} <- {:hosts_match, acct_host == request_host} do
{:ok, data}
else
_ -> {:error, {:webfinger_invalid, request_url, data}}
end
end
defp validate_webfinger(url, data), do: {:error, {:webfinger_invalid, url, data}}
end

4
test/fixtures/tesla_mock/gleasonator.com_host_meta vendored Normal file
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@ -0,0 +1,4 @@
<?xml version="1.0" encoding="UTF-8"?>
<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
<Link rel="lrdd" template="https://gleasonator.com/.well-known/webfinger?resource={uri}" type="application/xrd+xml" />
</XRD>

28
test/fixtures/tesla_mock/webfinger_spoof.json vendored Normal file
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@ -0,0 +1,28 @@
{
"aliases": [
"https://gleasonator.com/users/alex",
"https://mitra.social/users/alex"
],
"links": [
{
"href": "https://gleasonator.com/users/alex",
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html"
},
{
"href": "https://gleasonator.com/users/alex",
"rel": "self",
"type": "application/activity+json"
},
{
"href": "https://gleasonator.com/users/alex",
"rel": "self",
"type": "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""
},
{
"rel": "http://ostatus.org/schema/1.0/subscribe",
"template": "https://gleasonator.com/ostatus_subscribe?acct={uri}"
}
],
"subject": "acct:trump@whitehouse.gov"
}

41
test/fixtures/webfinger/graf-imposter-webfinger.json vendored Normal file
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@ -0,0 +1,41 @@
{
"subject": "acct:graf@poa.st",
"aliases": [
"https://fba.ryona.agenc/webfingertest"
],
"links": [
{
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html",
"href": "https://fba.ryona.agenc/webfingertest"
},
{
"rel": "self",
"type": "application/activity+json",
"href": "https://fba.ryona.agenc/webfingertest"
},
{
"rel": "http://ostatus.org/schema/1.0/subscribe",
"template": "https://fba.ryona.agenc/contact/follow?url={uri}"
},
{
"rel": "http://schemas.google.com/g/2010#updates-from",
"type": "application/atom+xml",
"href": ""
},
{
"rel": "salmon",
"href": "https://fba.ryona.agenc/salmon/friendica"
},
{
"rel": "http://microformats.org/profile/hcard",
"type": "text/html",
"href": "https://fba.ryona.agenc/hcard/friendica"
},
{
"rel": "http://joindiaspora.com/seed_location",
"type": "text/html",
"href": "https://fba.ryona.agenc"
}
]
}

102
test/pleroma/user_test.exs
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@ -877,109 +877,19 @@ test "gets an existing user by nickname starting with http" do
setup do: clear_config([Pleroma.Web.WebFinger, :update_nickname_on_user_fetch], true)
test "for mastodon" do
Tesla.Mock.mock(fn
%{url: "https://example.com/.well-known/host-meta"} ->
%Tesla.Env{
status: 302,
headers: [{"location", "https://sub.example.com/.well-known/host-meta"}]
}
%{url: "https://sub.example.com/.well-known/host-meta"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-host-meta.xml"
|> File.read!()
|> String.replace("{{domain}}", "sub.example.com")
}
%{url: "https://sub.example.com/.well-known/webfinger?resource=acct:a@example.com"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-webfinger.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "example.com")
|> String.replace("{{subdomain}}", "sub.example.com"),
headers: [{"content-type", "application/jrd+json"}]
}
%{url: "https://sub.example.com/users/a"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-user.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "sub.example.com"),
headers: [{"content-type", "application/activity+json"}]
}
%{url: "https://sub.example.com/users/a/collections/featured"} ->
%Tesla.Env{
status: 200,
body:
File.read!("test/fixtures/users_mock/masto_featured.json")
|> String.replace("{{domain}}", "sub.example.com")
|> String.replace("{{nickname}}", "a"),
headers: [{"content-type", "application/activity+json"}]
}
end)
ap_id = "a@example.com"
ap_id = "a@mastodon.example"
{:ok, fetched_user} = User.get_or_fetch(ap_id)
assert fetched_user.ap_id == "https://sub.example.com/users/a"
assert fetched_user.nickname == "a@example.com"
assert fetched_user.ap_id == "https://sub.mastodon.example/users/a"
assert fetched_user.nickname == "a@mastodon.example"
end
test "for pleroma" do
Tesla.Mock.mock(fn
%{url: "https://example.com/.well-known/host-meta"} ->
%Tesla.Env{
status: 302,
headers: [{"location", "https://sub.example.com/.well-known/host-meta"}]
}
%{url: "https://sub.example.com/.well-known/host-meta"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-host-meta.xml"
|> File.read!()
|> String.replace("{{domain}}", "sub.example.com")
}
%{url: "https://sub.example.com/.well-known/webfinger?resource=acct:a@example.com"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-webfinger.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "example.com")
|> String.replace("{{subdomain}}", "sub.example.com"),
headers: [{"content-type", "application/jrd+json"}]
}
%{url: "https://sub.example.com/users/a"} ->
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-user.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "sub.example.com"),
headers: [{"content-type", "application/activity+json"}]
}
end)
ap_id = "a@example.com"
ap_id = "a@pleroma.example"
{:ok, fetched_user} = User.get_or_fetch(ap_id)
assert fetched_user.ap_id == "https://sub.example.com/users/a"
assert fetched_user.nickname == "a@example.com"
assert fetched_user.ap_id == "https://sub.pleroma.example/users/a"
assert fetched_user.nickname == "a@pleroma.example"
end
end

54
test/pleroma/web/web_finger_test.exs
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@ -76,15 +76,6 @@ test "returns the ActivityPub actor URI for an ActivityPub user" do
{:ok, _data} = WebFinger.finger(user)
end
test "returns the ActivityPub actor URI and subscribe address for an ActivityPub user with the ld+json mimetype" do
user = "kaniini@gerzilla.de"
{:ok, data} = WebFinger.finger(user)
assert data["ap_id"] == "https://gerzilla.de/channel/kaniini"
assert data["subscribe_address"] == "https://gerzilla.de/follow?f=&url={uri}"
end
test "it work for AP-only user" do
user = "kpherox@mstdn.jp"
@ -99,12 +90,6 @@ test "it work for AP-only user" do
assert data["subscribe_address"] == "https://mstdn.jp/authorize_interaction?acct={uri}"
end
test "it works for friendica" do
user = "lain@squeet.me"
{:ok, _data} = WebFinger.finger(user)
end
test "it gets the xrd endpoint" do
{:ok, template} = WebFinger.find_lrdd_template("social.heldscal.la")
@ -203,5 +188,44 @@ test "refuses to process XML remote entities" do
assert :error = WebFinger.finger("pekorino@pawoo.net")
end
test "prevents spoofing" do
Tesla.Mock.mock(fn
%{
url: "https://gleasonator.com/.well-known/webfinger?resource=acct:alex@gleasonator.com"
} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/webfinger_spoof.json"),
headers: [{"content-type", "application/jrd+json"}]
}}
%{url: "https://gleasonator.com/.well-known/host-meta"} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/gleasonator.com_host_meta")
}}
end)
{:error, _data} = WebFinger.finger("alex@gleasonator.com")
end
end
@tag capture_log: true
test "prevents forgeries" do
Tesla.Mock.mock(fn
%{url: "https://fba.ryona.agency/.well-known/webfinger?resource=acct:graf@fba.ryona.agency"} ->
fake_webfinger =
File.read!("test/fixtures/webfinger/graf-imposter-webfinger.json") |> Jason.decode!()
Tesla.Mock.json(fake_webfinger)
%{url: "https://fba.ryona.agency/.well-known/host-meta"} ->
{:ok, %Tesla.Env{status: 404}}
end)
assert {:error, _} = WebFinger.finger("graf@fba.ryona.agency")
end
end

114
test/support/http_request_mock.ex
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@ -1521,6 +1521,120 @@ def get("https://friends.grishka.me/users/1", _, _, _) do
}}
end
def get("https://mastodon.example/.well-known/host-meta", _, _, _) do
{:ok,
%Tesla.Env{
status: 302,
headers: [{"location", "https://sub.mastodon.example/.well-known/host-meta"}]
}}
end
def get("https://sub.mastodon.example/.well-known/host-meta", _, _, _) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-host-meta.xml"
|> File.read!()
|> String.replace("{{domain}}", "sub.mastodon.example")
}}
end
def get(
"https://sub.mastodon.example/.well-known/webfinger?resource=acct:a@mastodon.example",
_,
_,
_
) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-webfinger.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "mastodon.example")
|> String.replace("{{subdomain}}", "sub.mastodon.example"),
headers: [{"content-type", "application/jrd+json"}]
}}
end
def get("https://sub.mastodon.example/users/a", _, _, _) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/masto-user.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "sub.mastodon.example"),
headers: [{"content-type", "application/activity+json"}]
}}
end
def get("https://sub.mastodon.example/users/a/collections/featured", _, _, _) do
{:ok,
%Tesla.Env{
status: 200,
body:
File.read!("test/fixtures/users_mock/masto_featured.json")
|> String.replace("{{domain}}", "sub.mastodon.example")
|> String.replace("{{nickname}}", "a"),
headers: [{"content-type", "application/activity+json"}]
}}
end
def get("https://pleroma.example/.well-known/host-meta", _, _, _) do
{:ok,
%Tesla.Env{
status: 302,
headers: [{"location", "https://sub.pleroma.example/.well-known/host-meta"}]
}}
end
def get("https://sub.pleroma.example/.well-known/host-meta", _, _, _) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-host-meta.xml"
|> File.read!()
|> String.replace("{{domain}}", "sub.pleroma.example")
}}
end
def get(
"https://sub.pleroma.example/.well-known/webfinger?resource=acct:a@pleroma.example",
_,
_,
_
) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-webfinger.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "pleroma.example")
|> String.replace("{{subdomain}}", "sub.pleroma.example"),
headers: [{"content-type", "application/jrd+json"}]
}}
end
def get("https://sub.pleroma.example/users/a", _, _, _) do
{:ok,
%Tesla.Env{
status: 200,
body:
"test/fixtures/webfinger/pleroma-user.json"
|> File.read!()
|> String.replace("{{nickname}}", "a")
|> String.replace("{{domain}}", "sub.pleroma.example"),
headers: [{"content-type", "application/activity+json"}]
}}
end
def get(url, query, body, headers) do
{:error,
"Mock response not implemented for GET #{inspect(url)}, #{query}, #{inspect(body)}, #{inspect(headers)}"}