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diff --git a/lib/http_signatures/http_signatures.ex b/lib/http_signatures/http_signatures.ex
index 018ee2e..3e666b5 100644
--- a/lib/http_signatures/http_signatures.ex
+++ b/lib/http_signatures/http_signatures.ex
@@ -1,85 +1,91 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: LGPL-3.0-only
# https://tools.ietf.org/html/draft-cavage-http-signatures-08
defmodule HTTPSignatures do
@moduledoc """
HTTP Signatures library.
"""
require Logger
def split_signature(sig) do
default = %{"headers" => "date"}
sig =
sig
|> String.trim()
|> String.split(",")
|> Enum.reduce(default, fn part, acc ->
[key | rest] = String.split(part, "=")
value = Enum.join(rest, "=")
Map.put(acc, key, String.trim(value, "\""))
end)
Map.put(sig, "headers", String.split(sig["headers"], ~r/\s/))
end
def validate(headers, signature, public_key) do
sigstring = build_signing_string(headers, signature["headers"])
Logger.debug("Signature: #{signature["signature"]}")
Logger.debug("Sigstring: #{sigstring}")
{:ok, sig} = Base.decode64(signature["signature"])
:public_key.verify(sigstring, :sha256, sig, public_key)
end
def validate_conn(conn) do
adapter = Application.get_env(:http_signatures, :adapter)
with {:ok, public_key} <- adapter.fetch_public_key(conn) do
if validate_conn(conn, public_key) do
true
else
Logger.debug("Could not validate, trying to refetch any relevant keys")
with {:ok, public_key} <- adapter.refetch_public_key(conn) do
validate_conn(conn, public_key)
end
end
else
e ->
Logger.debug("Could not validate against known public keys: #{inspect(e)}")
false
end
end
def validate_conn(conn, public_key) do
headers = Enum.into(conn.req_headers, %{})
signature = split_signature(headers["signature"])
validate(headers, signature, public_key)
end
+ @doc "Get signature for conn in split form."
+ def signature_for_conn(conn) do
+ headers = Enum.into(conn.req_headers, %{})
+ split_signature(headers["signature"])
+ end
+
def build_signing_string(headers, used_headers) do
used_headers
|> Enum.map(fn header -> "#{header}: #{headers[header]}" end)
|> Enum.join("\n")
end
def sign(private_key, key_id, headers) do
sigstring = build_signing_string(headers, Map.keys(headers))
signature =
:public_key.sign(sigstring, :sha256, private_key)
|> Base.encode64()
[
keyId: key_id,
algorithm: "rsa-sha256",
headers: Map.keys(headers) |> Enum.join(" "),
signature: signature
]
|> Enum.map(fn {k, v} -> "#{k}=\"#{v}\"" end)
|> Enum.join(",")
end
end
diff --git a/test/http_signatures_test.exs b/test/http_signatures_test.exs
index c7e063b..274f3dc 100644
--- a/test/http_signatures_test.exs
+++ b/test/http_signatures_test.exs
@@ -1,191 +1,211 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: LGPL-3.0-only
# Test data from https://tools.ietf.org/html/draft-cavage-http-signatures-08#appendix-C
defmodule HttpSignaturesTest do
use ExUnit.Case
@public_key hd(:public_key.pem_decode(File.read!("test/public.key")))
|> :public_key.pem_entry_decode()
@private_key hd(:public_key.pem_decode(File.read!("test/private.key")))
|> :public_key.pem_entry_decode()
@headers %{
"(request-target)" => "post /foo?param=value&pet=dog",
"host" => "example.com",
"date" => "Thu, 05 Jan 2014 21:31:40 GMT",
"content-type" => "application/json",
"digest" => "SHA-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=",
"content-length" => "18"
}
@default_signature """
keyId="Test",algorithm="rsa-sha256",signature="jKyvPcxB4JbmYY4mByyBY7cZfNl4OW9HpFQlG7N4YcJPteKTu4MWCLyk+gIr0wDgqtLWf9NLpMAMimdfsH7FSWGfbMFSrsVTHNTk0rK3usrfFnti1dxsM4jl0kYJCKTGI/UWkqiaxwNiKqGcdlEDrTcUhhsFsOIo8VhddmZTZ8w="
"""
@basic_signature """
keyId="Test",algorithm="rsa-sha256",headers="(request-target) host date",signature="HUxc9BS3P/kPhSmJo+0pQ4IsCo007vkv6bUm4Qehrx+B1Eo4Mq5/6KylET72ZpMUS80XvjlOPjKzxfeTQj4DiKbAzwJAb4HX3qX6obQTa00/qPDXlMepD2JtTw33yNnm/0xV7fQuvILN/ys+378Ysi082+4xBQFwvhNvSoVsGv4="
"""
@all_headers_signature """
keyId="Test",algorithm="rsa-sha256",headers="(request-target) host date content-type digest content-length",signature="Ef7MlxLXoBovhil3AlyjtBwAL9g4TN3tibLj7uuNB3CROat/9KaeQ4hW2NiJ+pZ6HQEOx9vYZAyi+7cmIkmJszJCut5kQLAwuX+Ms/mUFvpKlSo9StS2bMXDBNjOh4Auj774GFj4gwjS+3NhFeoqyr/MuN6HsEnkvn6zdgfE2i0="
"""
test "split up a signature" do
expected = %{
"keyId" => "Test",
"algorithm" => "rsa-sha256",
"signature" =>
"jKyvPcxB4JbmYY4mByyBY7cZfNl4OW9HpFQlG7N4YcJPteKTu4MWCLyk+gIr0wDgqtLWf9NLpMAMimdfsH7FSWGfbMFSrsVTHNTk0rK3usrfFnti1dxsM4jl0kYJCKTGI/UWkqiaxwNiKqGcdlEDrTcUhhsFsOIo8VhddmZTZ8w=",
"headers" => ["date"]
}
assert HTTPSignatures.split_signature(@default_signature) == expected
end
test "validates the default case" do
signature = HTTPSignatures.split_signature(@default_signature)
assert HTTPSignatures.validate(@headers, signature, @public_key)
end
test "validates the basic case" do
signature = HTTPSignatures.split_signature(@basic_signature)
assert HTTPSignatures.validate(@headers, signature, @public_key)
end
test "validates the all-headers case" do
signature = HTTPSignatures.split_signature(@all_headers_signature)
assert HTTPSignatures.validate(@headers, signature, @public_key)
end
test "it contructs a signing string" do
expected = "date: Thu, 05 Jan 2014 21:31:40 GMT\ncontent-length: 18"
assert expected == HTTPSignatures.build_signing_string(@headers, ["date", "content-length"])
end
+ test "it parses the http signature for a conn" do
+ conn = %{
+ req_headers: [
+ {"host", "localtesting.pleroma.lol"},
+ {"connection", "close"},
+ {"content-length", "2316"},
+ {"user-agent", "http.rb/2.2.2 (Mastodon/2.1.0.rc3; +http://mastodon.example.org/)"},
+ {"date", "Sun, 10 Dec 2017 14:23:49 GMT"},
+ {"digest", "SHA-256=x/bHADMW8qRrq2NdPb5P9fl0lYpKXXpe5h5maCIL0nM="},
+ {"content-type", "application/activity+json"},
+ {"(request-target)", "post /users/demiurge/inbox"},
+ {"signature",
+ "keyId=\"http://mastodon.example.org/users/admin#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"i0FQvr51sj9BoWAKydySUAO1RDxZmNY6g7M62IA7VesbRSdFZZj9/fZapLp6YSuvxUF0h80ZcBEq9GzUDY3Chi9lx6yjpUAS2eKb+Am/hY3aswhnAfYd6FmIdEHzsMrpdKIRqO+rpQ2tR05LwiGEHJPGS0p528NvyVxrxMT5H5yZS5RnxY5X2HmTKEgKYYcvujdv7JWvsfH88xeRS7Jlq5aDZkmXvqoR4wFyfgnwJMPLel8P/BUbn8BcXglH/cunR0LUP7sflTxEz+Rv5qg+9yB8zgBsB4C0233WpcJxjeD6Dkq0EcoJObBR56F8dcb7NQtUDu7x6xxzcgSd7dHm5w==\""}
+ ]
+ }
+
+ result = HTTPSignatures.signature_for_conn(conn)
+ assert result["keyId"] == "http://mastodon.example.org/users/admin#main-key"
+ end
+
test "it validates a conn" do
public_key_pem =
"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnGb42rPZIapY4Hfhxrgn\nxKVJczBkfDviCrrYaYjfGxawSw93dWTUlenCVTymJo8meBlFgIQ70ar4rUbzl6GX\nMYvRdku072d1WpglNHXkjKPkXQgngFDrh2sGKtNB/cEtJcAPRO8OiCgPFqRtMiNM\nc8VdPfPdZuHEIZsJ/aUM38EnqHi9YnVDQik2xxDe3wPghOhqjxUM6eLC9jrjI+7i\naIaEygUdyst9qVg8e2FGQlwAeS2Eh8ygCxn+bBlT5OyV59jSzbYfbhtF2qnWHtZy\nkL7KOOwhIfGs7O9SoR2ZVpTEQ4HthNzainIe/6iCR5HGrao/T8dygweXFYRv+k5A\nPQIDAQAB\n-----END PUBLIC KEY-----\n"
[public_key] = :public_key.pem_decode(public_key_pem)
public_key =
public_key
|> :public_key.pem_entry_decode()
conn = %{
req_headers: [
{"host", "localtesting.pleroma.lol"},
{"connection", "close"},
{"content-length", "2316"},
{"user-agent", "http.rb/2.2.2 (Mastodon/2.1.0.rc3; +http://mastodon.example.org/)"},
{"date", "Sun, 10 Dec 2017 14:23:49 GMT"},
{"digest", "SHA-256=x/bHADMW8qRrq2NdPb5P9fl0lYpKXXpe5h5maCIL0nM="},
{"content-type", "application/activity+json"},
{"(request-target)", "post /users/demiurge/inbox"},
{"signature",
"keyId=\"http://mastodon.example.org/users/admin#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"i0FQvr51sj9BoWAKydySUAO1RDxZmNY6g7M62IA7VesbRSdFZZj9/fZapLp6YSuvxUF0h80ZcBEq9GzUDY3Chi9lx6yjpUAS2eKb+Am/hY3aswhnAfYd6FmIdEHzsMrpdKIRqO+rpQ2tR05LwiGEHJPGS0p528NvyVxrxMT5H5yZS5RnxY5X2HmTKEgKYYcvujdv7JWvsfH88xeRS7Jlq5aDZkmXvqoR4wFyfgnwJMPLel8P/BUbn8BcXglH/cunR0LUP7sflTxEz+Rv5qg+9yB8zgBsB4C0233WpcJxjeD6Dkq0EcoJObBR56F8dcb7NQtUDu7x6xxzcgSd7dHm5w==\""}
]
}
assert HTTPSignatures.validate_conn(conn, public_key)
end
test "it validates a conn and fetches the key" do
conn = %{
params: %{"actor" => "http://mastodon.example.org/users/admin"},
req_headers: [
{"host", "localtesting.pleroma.lol"},
{"x-forwarded-for", "127.0.0.1"},
{"connection", "close"},
{"content-length", "2307"},
{"user-agent", "http.rb/2.2.2 (Mastodon/2.1.0.rc3; +http://mastodon.example.org/)"},
{"date", "Sun, 11 Feb 2018 17:12:01 GMT"},
{"digest", "SHA-256=UXsAnMtR9c7mi1FOf6HRMtPgGI1yi2e9nqB/j4rZ99I="},
{"content-type", "application/activity+json"},
{"signature",
"keyId=\"http://mastodon.example.org/users/admin#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"qXKqpQXUpC3d9bZi2ioEeAqP8nRMD021CzH1h6/w+LRk4Hj31ARJHDwQM+QwHltwaLDUepshMfz2WHSXAoLmzWtvv7xRwY+mRqe+NGk1GhxVZ/LSrO/Vp7rYfDpfdVtkn36LU7/Bzwxvvaa4ZWYltbFsRBL0oUrqsfmJFswNCQIG01BB52BAhGSCORHKtQyzo1IZHdxl8y80pzp/+FOK2SmHkqWkP9QbaU1qTZzckL01+7M5btMW48xs9zurEqC2sM5gdWMQSZyL6isTV5tmkTZrY8gUFPBJQZgihK44v3qgfWojYaOwM8ATpiv7NG8wKN/IX7clDLRMA8xqKRCOKw==\""},
{"(request-target)", "post /users/demiurge/inbox"}
]
}
assert HTTPSignatures.validate_conn(conn)
end
test "validate this" do
conn = %{
params: %{"actor" => "https://niu.moe/users/rye"},
req_headers: [
{"x-forwarded-for", "149.202.73.191"},
{"host", "testing.pleroma.lol"},
{"x-cluster-client-ip", "149.202.73.191"},
{"connection", "upgrade"},
{"content-length", "2396"},
{"user-agent", "http.rb/3.0.0 (Mastodon/2.2.0; +https://niu.moe/)"},
{"date", "Sun, 18 Feb 2018 20:31:51 GMT"},
{"digest", "SHA-256=dzH+vLyhxxALoe9RJdMl4hbEV9bGAZnSfddHQzeidTU="},
{"content-type", "application/activity+json"},
{"signature",
"keyId=\"https://niu.moe/users/rye#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"wtxDg4kIpW7nsnUcVJhBk6SgJeDZOocr8yjsnpDRqE52lR47SH6X7G16r7L1AUJdlnbfx7oqcvomoIJoHB3ghP6kRnZW6MyTMZ2jPoi3g0iC5RDqv6oAmDSO14iw6U+cqZbb3P/odS5LkbThF0UNXcfenVNfsKosIJycFjhNQc54IPCDXYq/7SArEKJp8XwEgzmiC2MdxlkVIUSTQYfjM4EG533cwlZocw1mw72e5mm/owTa80BUZAr0OOuhoWARJV9btMb02ZyAF6SCSoGPTA37wHyfM1Dk88NHf7Z0Aov/Fl65dpRM+XyoxdkpkrhDfH9qAx4iuV2VEWddQDiXHA==\""},
{"(request-target)", "post /inbox"}
]
}
assert HTTPSignatures.validate_conn(conn)
end
test "validate this too" do
conn = %{
params: %{"actor" => "https://niu.moe/users/rye"},
req_headers: [
{"x-forwarded-for", "149.202.73.191"},
{"host", "testing.pleroma.lol"},
{"x-cluster-client-ip", "149.202.73.191"},
{"connection", "upgrade"},
{"content-length", "2342"},
{"user-agent", "http.rb/3.0.0 (Mastodon/2.2.0; +https://niu.moe/)"},
{"date", "Sun, 18 Feb 2018 21:44:46 GMT"},
{"digest", "SHA-256=vS8uDOJlyAu78cF3k5EzrvaU9iilHCX3chP37gs5sS8="},
{"content-type", "application/activity+json"},
{"signature",
"keyId=\"https://niu.moe/users/rye#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"IN6fHD8pLiDEf35dOaRHzJKc1wBYh3/Yq0ItaNGxUSbJTd2xMjigZbcsVKzvgYYjglDDN+disGNeD+OBKwMqkXWaWe/lyMc9wHvCH5NMhpn/A7qGLY8yToSt4vh8ytSkZKO6B97yC+Nvy6Fz/yMbvKtFycIvSXCq417cMmY6f/aG+rtMUlTbKO5gXzC7SUgGJCtBPCh1xZzu5/w0pdqdjO46ePNeR6JyJSLLV4hfo3+p2n7SRraxM4ePVCUZqhwS9LPt3Zdhy3ut+IXCZgMVIZggQFM+zXLtcXY5HgFCsFQr5WQDu+YkhWciNWtKFnWfAsnsg5sC330lZ/0Z8Z91yA==\""},
{"(request-target)", "post /inbox"}
]
}
assert HTTPSignatures.validate_conn(conn)
end
test "it generates a signature" do
assert HTTPSignatures.sign(
@private_key,
"http://mastodon.example.org/users/admin#main-key",
%{host: "mastodon.example.org"}
) =~ "keyId=\""
end
test "this too" do
conn = %{
params: %{"actor" => "https://mst3k.interlinked.me/users/luciferMysticus"},
req_headers: [
{"host", "soc.canned-death.us"},
{"user-agent", "http.rb/3.0.0 (Mastodon/2.2.0; +https://mst3k.interlinked.me/)"},
{"date", "Sun, 11 Mar 2018 12:19:36 GMT"},
{"digest", "SHA-256=V7Hl6qDK2m8WzNsjzNYSBISi9VoIXLFlyjF/a5o1SOc="},
{"content-type", "application/activity+json"},
{"signature",
"keyId=\"https://mst3k.interlinked.me/users/luciferMysticus#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) user-agent host date digest content-type\",signature=\"CTYdK5a6lYMxzmqjLOpvRRASoxo2Rqib2VrAvbR5HaTn80kiImj15pCpAyx8IZp53s0Fn/y8MjCTzp+absw8kxx0k2sQAXYs2iy6xhdDUe7iGzz+XLAEqLyZIZfecynaU2nb3Z2XnFDjhGjR1vj/JP7wiXpwp6o1dpDZj+KT2vxHtXuB9585V+sOHLwSB1cGDbAgTy0jx/2az2EGIKK2zkw1KJuAZm0DDMSZalp/30P8dl3qz7DV2EHdDNfaVtrs5BfbDOZ7t1hCcASllzAzgVGFl0BsrkzBfRMeUMRucr111ZG+c0BNOEtJYOHSyZsSSdNknElggCJekONYMYk5ZA==\""},
{"x-forwarded-for", "2607:5300:203:2899::31:1337"},
{"x-forwarded-host", "soc.canned-death.us"},
{"x-forwarded-server", "soc.canned-death.us"},
{"connection", "Keep-Alive"},
{"content-length", "2006"},
{"(request-target)", "post /inbox"}
]
}
assert HTTPSignatures.validate_conn(conn)
end
end

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