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Merge branch 'fix/2209-remoteip' into 'develop'

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#2209 RemoteIP CIDR helper, config and doc improvements

See merge request pleroma/pleroma!3057
This commit is contained in:
Haelwenn 2020-10-08 17:29:00 +00:00
commit 74be4de3f6
5 changed files with 81 additions and 41 deletions
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13
config/config.exs
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@ -677,7 +677,18 @@ config :pleroma, :rate_limit,
config :pleroma, Pleroma.Workers.PurgeExpiredActivity, enabled: true, min_lifetime: 600
config :pleroma, Pleroma.Plugs.RemoteIp, enabled: true
config :pleroma, Pleroma.Plugs.RemoteIp,
enabled: true,
headers: ["x-forwarded-for"],
proxies: [],
reserved: [
"127.0.0.0/8",
"::1/128",
"fc00::/7",
"10.0.0.0/8",
"172.16.0.0/12",
"192.168.0.0/16"
]
config :pleroma, :static_fe, enabled: false

12
config/description.exs
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@ -3265,20 +3265,22 @@ config :pleroma, :config_description, [
%{
key: :headers,
type: {:list, :string},
description:
"A list of strings naming the `req_headers` to use when deriving the `remote_ip`. Order does not matter. Default: `~w[forwarded x-forwarded-for x-client-ip x-real-ip]`."
description: """
A list of strings naming the HTTP headers to use when deriving the true client IP. Default: `["x-forwarded-for"]`.
"""
},
%{
key: :proxies,
type: {:list, :string},
description:
"A list of strings in [CIDR](https://en.wikipedia.org/wiki/CIDR) notation specifying the IPs of known proxies. Default: `[]`."
"A list of upstream proxy IP subnets in CIDR notation from which we will parse the content of `headers`. Defaults to `[]`. IPv4 entries without a bitmask will be assumed to be /32 and IPv6 /128."
},
%{
key: :reserved,
type: {:list, :string},
description:
"Defaults to [localhost](https://en.wikipedia.org/wiki/Localhost) and [private network](https://en.wikipedia.org/wiki/Private_network)."
description: """
A list of reserved IP subnets in CIDR notation which should be ignored if found in `headers`. Defaults to `["127.0.0.0/8", "::1/128", "fc00::/7", "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]`
"""
}
]
},

6
docs/configuration/cheatsheet.md
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@ -426,9 +426,9 @@ This will make Pleroma listen on `127.0.0.1` port `8080` and generate urls start
Available options:
* `enabled` - Enable/disable the plug. Defaults to `false`.
* `headers` - A list of strings naming the `req_headers` to use when deriving the `remote_ip`. Order does not matter. Defaults to `["x-forwarded-for"]`.
* `proxies` - A list of strings in [CIDR](https://en.wikipedia.org/wiki/CIDR) notation specifying the IPs of known proxies. Defaults to `[]`.
* `reserved` - Defaults to [localhost](https://en.wikipedia.org/wiki/Localhost) and [private network](https://en.wikipedia.org/wiki/Private_network).
* `headers` - A list of strings naming the HTTP headers to use when deriving the true client IP address. Defaults to `["x-forwarded-for"]`.
* `proxies` - A list of upstream proxy IP subnets in CIDR notation from which we will parse the content of `headers`. Defaults to `[]`. IPv4 entries without a bitmask will be assumed to be /32 and IPv6 /128.
* `reserved` - A list of reserved IP subnets in CIDR notation which should be ignored if found in `headers`. Defaults to `["127.0.0.0/8", "::1/128", "fc00::/7", "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]`.
### :rate_limit

44
lib/pleroma/plugs/remote_ip.ex
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@ -7,48 +7,42 @@ defmodule Pleroma.Plugs.RemoteIp do
This is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration.
"""
alias Pleroma.Config
import Plug.Conn
@behaviour Plug
@headers ~w[
x-forwarded-for
]
# https://en.wikipedia.org/wiki/Localhost
# https://en.wikipedia.org/wiki/Private_network
@reserved ~w[
127.0.0.0/8
::1/128
fc00::/7
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
]
def init(_), do: nil
def call(%{remote_ip: original_remote_ip} = conn, _) do
config = Pleroma.Config.get(__MODULE__, [])
if Keyword.get(config, :enabled, false) do
%{remote_ip: new_remote_ip} = conn = RemoteIp.call(conn, remote_ip_opts(config))
if Config.get([__MODULE__, :enabled]) do
%{remote_ip: new_remote_ip} = conn = RemoteIp.call(conn, remote_ip_opts())
assign(conn, :remote_ip_found, original_remote_ip != new_remote_ip)
else
conn
end
end
defp remote_ip_opts(config) do
headers = config |> Keyword.get(:headers, @headers) |> MapSet.new()
reserved = Keyword.get(config, :reserved, @reserved)
defp remote_ip_opts do
headers = Config.get([__MODULE__, :headers], []) |> MapSet.new()
reserved = Config.get([__MODULE__, :reserved], [])
proxies =
config
|> Keyword.get(:proxies, [])
Config.get([__MODULE__, :proxies], [])
|> Enum.concat(reserved)
|> Enum.map(&InetCidr.parse/1)
|> Enum.map(&maybe_add_cidr/1)
{headers, proxies}
end
defp maybe_add_cidr(proxy) when is_binary(proxy) do
proxy =
cond do
"/" in String.codepoints(proxy) -> proxy
InetCidr.v4?(InetCidr.parse_address!(proxy)) -> proxy <> "/32"
InetCidr.v6?(InetCidr.parse_address!(proxy)) -> proxy <> "/128"
end
InetCidr.parse(proxy, true)
end
end

47
test/plugs/remote_ip_test.exs
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@ -3,13 +3,27 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Plugs.RemoteIpTest do
use ExUnit.Case, async: true
use ExUnit.Case
use Plug.Test
alias Pleroma.Plugs.RemoteIp
import Pleroma.Tests.Helpers, only: [clear_config: 1, clear_config: 2]
setup do: clear_config(RemoteIp)
import Pleroma.Tests.Helpers, only: [clear_config: 2]
setup do:
clear_config(RemoteIp,
enabled: true,
headers: ["x-forwarded-for"],
proxies: [],
reserved: [
"127.0.0.0/8",
"::1/128",
"fc00::/7",
"10.0.0.0/8",
"172.16.0.0/12",
"192.168.0.0/16"
]
)
test "disabled" do
Pleroma.Config.put(RemoteIp, enabled: false)
@ -25,8 +39,6 @@ defmodule Pleroma.Plugs.RemoteIpTest do
end
test "enabled" do
Pleroma.Config.put(RemoteIp, enabled: true)
conn =
conn(:get, "/")
|> put_req_header("x-forwarded-for", "1.1.1.1")
@ -54,8 +66,6 @@ defmodule Pleroma.Plugs.RemoteIpTest do
end
test "custom proxies" do
Pleroma.Config.put(RemoteIp, enabled: true)
conn =
conn(:get, "/")
|> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1, 173.245.48.2")
@ -72,4 +82,27 @@ defmodule Pleroma.Plugs.RemoteIpTest do
assert conn.remote_ip == {1, 1, 1, 1}
end
test "proxies set without CIDR format" do
Pleroma.Config.put([RemoteIp, :proxies], ["173.245.48.1"])
conn =
conn(:get, "/")
|> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1")
|> RemoteIp.call(nil)
assert conn.remote_ip == {1, 1, 1, 1}
end
test "proxies set `nonsensical` CIDR" do
Pleroma.Config.put([RemoteIp, :reserved], ["127.0.0.0/8"])
Pleroma.Config.put([RemoteIp, :proxies], ["10.0.0.3/24"])
conn =
conn(:get, "/")
|> put_req_header("x-forwarded-for", "10.0.0.3, 1.1.1.1")
|> RemoteIp.call(nil)
assert conn.remote_ip == {1, 1, 1, 1}
end
end