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%%% Copyright (c) 2014, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(catlfish).
-export([add_chain/2, entries/2, entry_and_proof/2]).
-include("$CTROOT/plop/include/plop.hrl").
-define(PROTOCOL_VERSION, 0).
%%-type signature_type() :: certificate_timestamp | tree_hash | test. % uint8
-type entry_type() :: x509_entry | precert_entry | test. % uint16
-type leaf_type() :: timestamped_entry | test. % uint8
-type leaf_version() :: v1 | v2. % uint8
-record(mtl, {leaf_version :: leaf_version(),
leaf_type :: leaf_type(),
entry :: timestamped_entry()}).
-type mtl() :: #mtl{}.
-record(timestamped_entry, {timestamp :: integer(),
entry_type :: entry_type(),
signed_entry :: binary(),
extensions = <<>> :: binary()}).
-type timestamped_entry() :: #timestamped_entry{}.
-spec serialise(mtl() | timestamped_entry()) -> binary().
serialise(#timestamped_entry{timestamp = Timestamp} = E) ->
list_to_binary(
[<<Timestamp:64>>,
serialise_entry_type(E#timestamped_entry.entry_type),
encode_tls_vector(E#timestamped_entry.signed_entry, 3),
encode_tls_vector(E#timestamped_entry.extensions, 2)]);
serialise(#mtl{leaf_version = LeafVersion,
leaf_type = LeafType,
entry = TimestampedEntry}) ->
list_to_binary(
[serialise_leaf_version(LeafVersion),
serialise_leaf_type(LeafType),
serialise(TimestampedEntry)]).
serialise_leaf_version(v1) ->
<<0:8>>;
serialise_leaf_version(v2) ->
<<1:8>>.
serialise_leaf_type(timestamped_entry) ->
<<0:8>>.
%% serialise_leaf_type(_) ->
%% <<>>.
serialise_entry_type(x509_entry) ->
<<0:16>>;
serialise_entry_type(precert_entry) ->
<<1:16>>.
serialise_signature_type(certificate_timestamp) ->
<<0:8>>;
serialise_signature_type(tree_hash) ->
<<1:8>>.
build_mtl(Timestamp, LeafCert) ->
TSE = #timestamped_entry{timestamp = Timestamp,
entry_type = x509_entry,
signed_entry = LeafCert},
MTL = #mtl{leaf_version = v1,
leaf_type = timestamped_entry,
entry = TSE},
serialise(MTL).
-spec add_chain(binary(), [binary()]) -> nonempty_string().
add_chain(LeafCert, CertChain) ->
EntryHash = crypto:hash(sha256, LeafCert),
TimestampedEntry =
case plop:get(EntryHash) of
notfound ->
Timestamp = plop:generate_timestamp(),
TSE = #timestamped_entry{timestamp = Timestamp,
entry_type = x509_entry,
signed_entry = LeafCert},
MTL = #mtl{leaf_version = v1,
leaf_type = timestamped_entry,
entry = TSE},
ok = plop:add(
serialise_logentry(Timestamp, LeafCert, CertChain),
ht:leaf_hash(serialise(MTL)),
crypto:hash(sha256, LeafCert)),
TSE;
{_Index, _MTLHash, Entry} ->
<<Timestamp:64, _LogEntry/binary>> = Entry,
%% TODO: Perform a costly db consistency check against
%% unpacked LogEntry (w/ LeafCert and CertChain)
#timestamped_entry{timestamp = Timestamp,
entry_type = x509_entry,
signed_entry = LeafCert}
end,
SCT_sig =
plop:spt(list_to_binary([<<?PROTOCOL_VERSION:8>>,
serialise_signature_type(certificate_timestamp),
serialise(TimestampedEntry)])),
binary_to_list(
jiffy:encode(
{[{sct_version, ?PROTOCOL_VERSION},
{id, base64:encode(plop:get_logid())},
{timestamp, TimestampedEntry#timestamped_entry.timestamp},
{extensions, base64:encode(<<>>)},
{signature, base64:encode(plop:serialise(SCT_sig))}]})).
-spec serialise_logentry(integer(), binary(), [binary()]) -> binary().
serialise_logentry(Timestamp, LeafCert, CertChain) ->
list_to_binary(
[<<Timestamp:64>>,
list_to_binary(
[encode_tls_vector(LeafCert, 3),
encode_tls_vector(
list_to_binary(
[encode_tls_vector(X, 3) || X <- CertChain]), 3)])]).
-spec entries(non_neg_integer(), non_neg_integer()) -> list().
entries(Start, End) ->
binary_to_list(
jiffy:encode({[{entries, x_entries(plop:get(Start, End))}]})).
-spec entry_and_proof(non_neg_integer(), non_neg_integer()) -> list().
entry_and_proof(Index, TreeSize) ->
binary_to_list(
jiffy:encode(
case plop:inclusion_and_entry(Index, TreeSize) of
{ok, {Entry, Path}} ->
{Timestamp, LeafCertVector, CertChainVector} = unpack_entry(Entry),
MTL = build_mtl(Timestamp, LeafCertVector),
{[{leaf_input, base64:encode(MTL)},
{extra_data, base64:encode(CertChainVector)},
{audit_path, [base64:encode(X) || X <- Path]}]};
{notfound, Msg} ->
{[{success, false},
{error_message, list_to_binary(Msg)}]}
end)).
%% Private functions.
unpack_entry(Entry) ->
<<Timestamp:64, LogEntry/binary>> = Entry,
{LeafCertVector, CertChainVector} = decode_tls_vector(LogEntry, 3),
{Timestamp, LeafCertVector, CertChainVector}.
-spec x_entries([{non_neg_integer(), binary(), binary()}]) -> list().
x_entries([]) ->
[];
x_entries([H|T]) ->
{_Index, _Hash, Entry} = H,
{Timestamp, LeafCertVector, CertChainVector} = unpack_entry(Entry),
MTL = build_mtl(Timestamp, LeafCertVector),
[{[{leaf_input, base64:encode(MTL)}, {extra_data, base64:encode(CertChainVector)}]} |
x_entries(T)].
-spec encode_tls_vector(binary(), non_neg_integer()) -> binary().
encode_tls_vector(Binary, LengthLen) ->
Length = byte_size(Binary),
<<Length:LengthLen/integer-unit:8, Binary/binary>>.
-spec decode_tls_vector(binary(), non_neg_integer()) -> {binary(), binary()}.
decode_tls_vector(Binary, LengthLen) ->
<<Length:LengthLen/integer-unit:8, Rest/binary>> = Binary,
<<ExtractedBinary:Length/binary-unit:8, Rest2/binary>> = Rest,
{ExtractedBinary, Rest2}.
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