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%%% Copyright (c) 2014-2015, NORDUnet A/S.
%%% See LICENSE for licensing information.
%%%
%%% @doc Signing service
-module(sign).
-behaviour(gen_server).
%% API.
-export([start_link/0, stop/0]).
-export([sign_sct/1, sign_sth/1, get_pubkey/0, get_logid/0, verify_sth/2]).
-export([read_keyfile_ec/1]).
%% API for tests.
-export([read_keyfile_rsa/2]).
%% gen_server callbacks.
-export([init/1, handle_call/3, terminate/2,
handle_cast/2, handle_info/2, code_change/3]).
-define(CERTIFICATE_TIMESTAMP, 0).
-define(TREE_HASH, 1).
-import(stacktrace, [call/2]).
-include_lib("public_key/include/public_key.hrl").
-include_lib("eunit/include/eunit.hrl").
-record(state, {pubkey :: public_key:rsa_public_key(),
privkey :: public_key:rsa_private_key(),
hsmport :: port(),
logid :: binary()
}).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
stop() ->
call(?MODULE, stop).
init([]) ->
%% Read RSA keypair.
%% {Private_key, Public_key} = read_keyfile_rsa(Keyfile, Passphrase),
%% LogID = crypto:hash(sha256,
%% public_key:der_encode('RSAPublicKey', Public_key)),
%% Read EC keypair.
PubKeyfile = application:get_env(plop, log_public_key, none),
Public_key = read_keyfile_ec(PubKeyfile),
LogID = read_keyfile_ec_logid(PubKeyfile),
case application:get_env(plop, hsm) of
{ok, Args} ->
Port = open_port({spawn_executable,
code:priv_dir(plop) ++ "/hsmhelper"},
[{args, Args},
{packet, 4}]),
{ok, #state{pubkey = Public_key,
hsmport = Port,
logid = LogID}};
undefined ->
PrivKeyfile = application:get_env(plop, log_private_key, none),
Private_key = read_keyfile_ec(PrivKeyfile),
{ok, #state{pubkey = Public_key,
privkey = Private_key,
logid = LogID}}
end.
%% TODO: Merge the keyfile reading functions.
%% @doc Read one password protected PEM file with an RSA keypair.
read_keyfile_rsa(Filename, Passphrase) ->
{ok, PemBin} = file:read_file(Filename),
[KeyPem] = public_key:pem_decode(PemBin), % Use first entry.
Privatekey = decode_key(KeyPem, Passphrase),
{Privatekey, public_key(Privatekey)}.
filter_pem_types(ParsedPem, Types) ->
[E || E <- ParsedPem,
lists:member(element(1, E), Types)].
read_keyfile_ec(KeyFile) ->
lager:debug("reading file ~p", [KeyFile]),
{ok, PemBin} = file:read_file(KeyFile),
[KeyPem] = filter_pem_types(public_key:pem_decode(PemBin), ['ECPrivateKey', 'SubjectPublicKeyInfo']),
decode_key(KeyPem).
read_keyfile_ec_logid(KeyFile) ->
lager:debug("reading file ~p", [KeyFile]),
{ok, PemBin} = file:read_file(KeyFile),
[{'SubjectPublicKeyInfo', Der, _}] = filter_pem_types(public_key:pem_decode(PemBin), ['SubjectPublicKeyInfo']),
crypto:hash(sha256, Der).
pem_entry_decode({'SubjectPublicKeyInfo', Der, _}) ->
SPKI = public_key:der_decode('SubjectPublicKeyInfo', Der),
#'SubjectPublicKeyInfo'{subjectPublicKey = {_, Octets},
algorithm = Algorithm} = SPKI,
#'AlgorithmIdentifier'{parameters = ECParams} = Algorithm,
Params = public_key:der_decode('EcpkParameters', ECParams),
Point = #'ECPoint'{point = Octets},
{Point, Params};
pem_entry_decode(Entry) ->
public_key:pem_entry_decode(Entry).
%% -spec signhash_rsa(iolist() | binary(), public_key:rsa_private_key()) -> binary().
%% signhash_rsa(Data, PrivKey) ->
%% %% Was going to just crypto:sign/3 the hash but looking at
%% %% digitally_signed() in lib/ssl/src/ssl_handshake.erl it seems
%% %% like we should rather use (undocumented) encrypt_private/3.
%% %public_key:sign(hash(sha256, BinToSign), sha256, PrivKey)
%% public_key:encrypt_private(crypto:hash(sha256, Data),
%% PrivKey,
%% [{rsa_pad, rsa_pkcs1_padding}]).
-spec signhash_ec(iolist() | binary(), public_key:ec_private_key()) -> binary().
signhash_ec(Data, PrivKey) ->
public_key:sign(Data, sha256, PrivKey).
decode_key(Entry) ->
pem_entry_decode(Entry).
decode_key(Entry, Passphrase) ->
public_key:pem_entry_decode(Entry, Passphrase).
public_key(#'RSAPrivateKey'{modulus = Mod, publicExponent = Exp}) ->
#'RSAPublicKey'{modulus = Mod, publicExponent = Exp}.
remote_sign_request([], _Request) ->
none;
remote_sign_request([URL|RestURLs], Request) ->
case plop_httputil:request("signing", URL, [{"Content-Type", "text/json"}], list_to_binary(mochijson2:encode(Request))) of
{error, Error} ->
lager:info("request error: ~p", [Error]),
remote_sign_request(RestURLs, Request);
{failure, _StatusLine, _RespHeaders, _Body} ->
lager:debug("auth check failed"),
remote_sign_request(RestURLs, Request);
{success, {_HttpVersion, StatusCode, _ReasonPhrase}, _RespHeaders, Body} when StatusCode == 200 ->
lager:debug("auth check succeeded"),
case (catch mochijson2:decode(Body)) of
{error, E} ->
lager:error("json parse error: ~p", [E]),
remote_sign_request(RestURLs, Request);
{struct, PropList} ->
base64:decode(proplists:get_value(<<"result">>, PropList))
end;
{noauth, _StatusLine, _RespHeaders, _Body} ->
lager:debug("no auth"),
remote_sign_request(RestURLs, Request);
_ ->
remote_sign_request(RestURLs, Request)
end.
%%%%%%%%%%%%%%%%%%%%
%% Public API.
sign_sct(Data = <<_Version:8,
?CERTIFICATE_TIMESTAMP:8,
_/binary>>) ->
case application:get_env(plop, signing_nodes) of
{ok, URLBases} ->
Request = {[{plop_version, 1},
{data, base64:encode(Data)}
]},
remote_sign_request([URLBase ++ "sct" || URLBase <- URLBases], Request);
undefined ->
call(?MODULE, {sign, Data})
end.
sign_sth(Data = <<_Version:8,
?TREE_HASH:8,
_/binary>>) ->
case application:get_env(plop, signing_nodes) of
{ok, URLBases} ->
Request = {[{plop_version, 1},
{data, base64:encode(Data)}
]},
remote_sign_request([URLBase ++ "sth" || URLBase <- URLBases], Request);
undefined ->
call(?MODULE, {sign, Data})
end.
get_pubkey() ->
call(?MODULE, {get, pubkey}).
get_logid() ->
PubKeyfile = application:get_env(plop, log_public_key, none),
read_keyfile_ec_logid(PubKeyfile).
verify_sth(STH, Signature) ->
lager:debug("verifying ~p: ~p", [STH, Signature]),
PubKeyfile = application:get_env(plop, log_public_key, none),
PublicKey = read_keyfile_ec(PubKeyfile),
public_key:verify(STH, sha256, Signature, PublicKey).
encode_ec_signature(RawSignature, SignatureLength) ->
<<R:SignatureLength, S:SignatureLength>> = RawSignature,
{ok, Signature} = 'Dss':encode('Dss-Sig-Value', #'Dss-Sig-Value'{r = R, s = S}),
Signature.
%%%%%%%%%%%%%%%%%%%%
%% gen_server callbacks.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Reason, _State) ->
io:format("~p terminating~n", [?MODULE]),
ok.
handle_call(stop, _From, State) ->
{stop, normal, stopped, State};
handle_call({get, logid}, _From, State) ->
{reply, State#state.logid, State};
handle_call({get, pubkey}, _From, State) ->
{reply, State#state.pubkey, State};
handle_call({sign, Data}, _From, State) ->
%% FIXME: Merge RSA and DC.
case State#state.hsmport of
undefined ->
Signature = signhash_ec(Data, State#state.privkey),
lager:debug("signing ~p: ~p", [Data, Signature]),
{reply, Signature, State};
Port ->
lager:debug("sending signing request to HSM"),
Port ! {self(), {command, crypto:hash(sha256, Data)}},
receive
{Port, {data, RawSignature}} when is_port(Port) ->
Signature = encode_ec_signature(list_to_binary(RawSignature), 256),
lager:debug("received signing reply from HSM: ~p", [Signature]),
{reply, Signature, State}
end
end.
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