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|
defmodule Hex.HTTP.SSL do
@moduledoc false
require Record
alias Hex.HTTP.Certs
alias Hex.HTTP.VerifyHostname
# From https://www.ssllabs.com/ssltest/clients.html Android 7
@default_ciphers [
~c"AES128-GCM-SHA256",
~c"AES128-SHA",
~c"AES256-GCM-SHA384",
~c"AES256-SHA",
~c"DES-CBC3-SHA",
~c"ECDHE-ECDSA-AES128-GCM-SHA256",
~c"ECDHE-ECDSA-AES128-SHA",
~c"ECDHE-ECDSA-AES256-GCM-SHA384",
~c"ECDHE-ECDSA-AES256-SHA",
~c"ECDHE-ECDSA-CHACHA20-POLY1305-SHA256",
~c"ECDHE-RSA-AES128-GCM-SHA256",
~c"ECDHE-RSA-AES128-SHA",
~c"ECDHE-RSA-AES256-GCM-SHA384",
~c"ECDHE-RSA-AES256-SHA",
~c"ECDHE-RSA-CHACHA20-POLY1305-SHA256"
]
@default_versions [:"tlsv1.2", :"tlsv1.1", :tlsv1]
@secure_ssl_version {5, 3, 7}
Record.defrecordp(
:certificate,
:OTPCertificate,
Record.extract(:OTPCertificate, from_lib: "public_key/include/OTP-PUB-KEY.hrl")
)
Record.defrecordp(
:tbs_certificate,
:OTPTBSCertificate,
Record.extract(:OTPTBSCertificate, from_lib: "public_key/include/OTP-PUB-KEY.hrl")
)
def secure_ssl? do
check? = not Hex.State.fetch!(:unsafe_https)
if check? and Hex.State.fetch!(:ssl_version) <= @secure_ssl_version do
Mix.raise(
"Insecure HTTPS request (peer verification disabled), " <>
"please update to OTP 17.4 or later, or disable by setting " <>
"the environment variable HEX_UNSAFE_HTTPS=1"
)
end
check?
end
def get_ca_certs do
case Hex.State.fetch!(:cacerts_path) do
nil -> Certs.cacerts()
path -> Certs.decode_runtime(path)
end
end
def ssl_opts(url) do
hostname = String.to_charlist(URI.parse(url).host)
ciphers = filter_ciphers(@default_ciphers)
if secure_ssl?() do
partial_chain = &partial_chain(Certs.cacerts(), &1)
[
verify: :verify_peer,
depth: 4,
partial_chain: partial_chain,
cacerts: get_ca_certs(),
server_name_indication: hostname,
secure_renegotiate: true,
reuse_sessions: true,
versions: @default_versions,
ciphers: ciphers
]
|> customize_hostname_check(hostname)
else
[
verify: :verify_none,
server_name_indication: hostname,
secure_renegotiate: true,
reuse_sessions: true,
versions: @default_versions,
ciphers: ciphers
]
end
end
def partial_chain(cacerts, certs) do
certs = Enum.map(certs, &{&1, :public_key.pkix_decode_cert(&1, :otp)})
cacerts = Enum.map(cacerts, &:public_key.pkix_decode_cert(&1, :otp))
trusted =
Enum.find_value(certs, fn {der, cert} ->
trusted? =
Enum.find(cacerts, fn cacert ->
extract_public_key_info(cacert) == extract_public_key_info(cert)
end)
if trusted?, do: der
end)
if trusted do
{:trusted_ca, trusted}
else
:unknown_ca
end
end
defp extract_public_key_info(cert) do
cert
|> certificate(:tbsCertificate)
|> tbs_certificate(:subjectPublicKeyInfo)
end
defp filter_ciphers(allowed) do
available = MapSet.new(Hex.Stdlib.ssl_cipher_suites(:openssl))
Enum.filter(allowed, &(&1 in available))
end
defp customize_hostname_check(opts, hostname) do
if ssl_major_version() >= 9 do
# From OTP 20.0 use built-in support for custom hostname checks
Keyword.put(opts, :customize_hostname_check, match_fun: &VerifyHostname.match_fun/2)
else
# Before OTP 20.0 use mint_shims for hostname check, from a custom verify_fun
Keyword.put(opts, :verify_fun, {&VerifyHostname.verify_fun/3, check_hostname: hostname})
end
end
defp ssl_major_version do
# Elixir 1.0.5 - 1.1.1 have no Application.spec/2
case :application.get_key(:ssl, :vsn) do
{:ok, value} -> value
:undefined -> nil
end
|> :string.to_integer()
|> elem(0)
end
end
|
