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%%% Copyright (c) 2014-2015, NORDUnet A/S.
%%% See LICENSE for licensing information.
%%%
-module(plop_httputil).
-export([request/4]).
-include_lib("hackney/include/hackney_lib.hrl").
-include_lib("public_key/include/public_key.hrl").
get_auth_header(Headers) ->
case hackney_headers:get_value("X-Catlfish-Auth", Headers) of
undefined ->
undefined;
Result when is_binary(Result) ->
lager:debug("received auth header: ~p", [Result]),
binary_to_list(Result)
end.
add_auth(Method, Path, Headers, Data) ->
AuthHeader = http_auth:create_auth(Method, Path, Data),
lager:debug("sent auth header: ~p", [AuthHeader]),
[{"X-Catlfish-Auth", AuthHeader} | Headers].
get_cert_hostname(Cert) ->
TBSCert = Cert#'OTPCertificate'.tbsCertificate,
Subject = TBSCert#'OTPTBSCertificate'.subject,
{rdnSequence, RDNs} = Subject,
CNs = lists:map(fun([#'AttributeTypeAndValue'{type=?'id-at-commonName',
value=Value}]) ->
Value;
(_) ->
none
end, RDNs),
case [CN || CN <- CNs, CN /= none] of
[{utf8String, BinCN} | _] when is_binary(BinCN) ->
binary_to_list(BinCN);
[CN | _] ->
CN;
[] ->
""
end.
verify_fun(_,{bad_cert, _} = Reason, _) ->
{fail, Reason};
verify_fun(_,{extension, _}, UserState) ->
{unknown, UserState};
verify_fun(_, valid, UserState) ->
{valid, UserState};
verify_fun(Cert, valid_peer, UserState) ->
CertHostname = get_cert_hostname(Cert),
case lists:keyfind(check_hostname, 1, UserState) of
{check_hostname, CertHostname} ->
{valid, UserState};
{check_hostname, ExpectedHostname} ->
lager:info("Expected hostname ~p but certificate has hostname ~p",
[ExpectedHostname, CertHostname]),
{fail, "Hostname does not match"};
false ->
{valid, UserState}
end.
read_and_verify_cacertfile(Filename) ->
{ok, PemBin} = file:read_file(Filename),
[KeyPem] = public_key:pem_decode(PemBin),
{'Certificate', Der, _} = KeyPem,
CalculatedHash = crypto:hash(sha256, Der),
CorrectHash = application:get_env(plop, https_cacert_fingerprint, none),
CorrectHash = CalculatedHash,
Der.
request(DebugTag, URL, Headers, <<>>) ->
request(DebugTag, URL, Headers, <<>>, get);
request(DebugTag, URL, Headers, RequestBody) ->
request(DebugTag, URL, Headers, RequestBody, post).
-define(MAX_CHUNK_SIZE, 512*1024).
chunk_data(<<>>) ->
eof;
chunk_data(Data) when is_binary(Data) ->
ChunkSize = min(size(Data), ?MAX_CHUNK_SIZE),
lager:debug("~p data left, sending ~p bytes", [size(Data), ChunkSize]),
{Chunk, Rest} = split_binary(Data, ChunkSize),
{ok, Chunk, Rest}.
request(DebugTag, URL, Headers, RequestBody, Method) ->
Starttime = os:timestamp(),
ParsedURL = hackney_url:parse_url(URL),
CACertFile = application:get_env(plop, https_cacertfile, none),
CACert = read_and_verify_cacertfile(CACertFile),
MethodString = case Method of
get -> "GET";
post -> "POST"
end,
#hackney_url{path = Path, host = Host, qs = QueryString, raw_path = RawPath} = ParsedURL,
lager:debug("~s: sending http request to ~p",
[DebugTag, URL]),
case hackney:connect(ParsedURL,
[{ssl_options, [{cacerts, [CACert]},
{verify, verify_peer},
{verify_fun, {fun verify_fun/3,
[{check_hostname, Host}]}}
]}]) of
{ok, ConnRef} ->
lager:debug("~s: connected to ~p",
[DebugTag, URL]),
{ok, StatusCode, RespHeaders, ClientRef} =
case Method of
post ->
hackney:send_request(ConnRef,
{Method, Path,
add_auth(MethodString, Path, Headers,
RequestBody),
{fun chunk_data/1, RequestBody}});
get ->
hackney:send_request(ConnRef,
{Method, RawPath,
add_auth(MethodString, Path, Headers,
QueryString),
<<>>})
end,
lager:debug("~s: received headers for ~p: ~p",
[DebugTag, URL, RespHeaders]),
{ok, Body} = hackney:body(ClientRef),
Stoptime = os:timestamp(),
hackney:close(ClientRef),
lager:debug("~s: received body for ~p: status ~p, time ~p",
[DebugTag, URL, StatusCode, timer:now_diff(Stoptime, Starttime)]),
StatusLine = {none, StatusCode, none},
AuthHeader = get_auth_header(hackney_headers:new(RespHeaders)),
{http_auth:verify_auth(AuthHeader, "REPLY",
binary_to_list(Path), Body),
StatusLine, RespHeaders, Body};
{error, Error} ->
{error, Error}
end.
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