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%%% Copyright (c) 2014-2015, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(http_auth).
-export([verify_auth/4, create_auth/3, init_key_table/0]).
-define(KEY_TABLE, http_auth_keys).
init_key_table() ->
case ets:info(?KEY_TABLE) of
undefined ->
ok;
_ ->
ets:delete(?KEY_TABLE)
end,
ets:new(?KEY_TABLE, [set, public, named_table]),
read_key_table().
read_key_table() ->
lists:foreach(
fun ({KeyName, Der}) ->
true = ets:insert(?KEY_TABLE, {KeyName, sign:pem_entry_decode({'SubjectPublicKeyInfo', Der, []})})
end, plopconfig:get_env(apikeys, [])),
case application:get_env(plop, own_key, none) of
{_OwnKeyName, OwnKeyFile} ->
OwnKey = sign:read_keyfile_ec(OwnKeyFile),
true = ets:insert(?KEY_TABLE, {own_key, OwnKey});
none ->
none
end.
own_key() ->
case application:get_env(plop, own_key, none) of
{KeyName, _KeyFile} ->
[{_, Key}] = ets:lookup(?KEY_TABLE, own_key),
{Key, KeyName};
none ->
none
end.
lookup_publickey(nokey) ->
nokey;
lookup_publickey(KeyName) ->
case ets:lookup(?KEY_TABLE, KeyName) of
[{_, Key}] ->
Key;
[] ->
failure
end.
parse_option(S) ->
parse_option(S, []).
parse_option([], Key) ->
{lists:reverse(Key), []};
parse_option([$= | Rest], Key) ->
{lists:reverse(Key), Rest};
parse_option([C | Rest], Key) ->
parse_option(Rest, [C | Key]).
sign(PrivKey, Method, Path, Data) ->
public_key:sign(iolist_to_binary([Method, 0, Path, 0, Data]), sha256, PrivKey).
verify(Signature, PublicKey, Method, Path, Data) ->
public_key:verify(iolist_to_binary([Method, 0, Path, 0, Data]), sha256, Signature, PublicKey).
check_acl(Method, KeyName, Path) ->
EnvVarName = case Method of
"REPLY" ->
allowed_servers;
_ ->
allowed_clients
end,
ACL = plopconfig:get_env(EnvVarName, []),
lager:debug("ACL: ~p", [ACL]),
case lists:keyfind(Path, 1, ACL) of
{_, noauth} ->
lager:debug("Anonymous access allowed"),
success;
{_, AllowedKeys} when is_list(AllowedKeys) ->
lager:debug("Checking key ~p, allowed keys: ~p", [KeyName, AllowedKeys]),
case lists:member(KeyName, AllowedKeys) of
true ->
success;
false ->
failure
end;
false ->
lager:debug("No allowed keys found for: ~p", [Path]),
failure
end.
get_authheader_keyname(AuthHeader) ->
case string:tokens(AuthHeader, ";") of
[AuthTokenBase64 | OptionsRaw] ->
AuthToken = base64:decode(AuthTokenBase64),
Options = [parse_option(E) || E <- OptionsRaw],
case lists:keyfind("key", 1, Options) of
{_, Value} ->
{Value, AuthToken};
false ->
{nokey, <<>>}
end;
_ ->
{nokey, <<>>}
end.
verify_auth(undefined, Method, Path, _Data) ->
case check_acl(Method, noauth, Path) of
success ->
noauth;
Error ->
case Method of
"REPLY" ->
lager:info("anonymous replies not allowed for path ~p", [Path]);
_ ->
lager:info("anonymous access not allowed for path ~p", [Path])
end,
Error
end;
verify_auth(AuthHeader, Method, Path, Data) ->
{KeyName, AuthToken} = get_authheader_keyname(AuthHeader),
AuthSuccess = case lookup_publickey(KeyName) of
nokey ->
false;
failure ->
lager:info("key name ~p could not be found", [KeyName]),
false;
Key ->
verify(AuthToken, Key, Method, Path, Data)
end,
case AuthSuccess of
true ->
check_acl(Method, KeyName, Path);
_ ->
lager:info("authentication token ~p was not valid for key name ~p: ~p ~p ~p", [mochihex:to_hex(AuthToken), KeyName, Method, Path, Data]),
failure
end.
create_auth(Method, Path, Data) ->
case own_key() of
{Key, KeyName} ->
AuthToken = sign(Key, Method, Path, Data),
base64:encode_to_string(AuthToken) ++ ";key=" ++ KeyName;
none ->
""
end.
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