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%%% Copyright (c) 2014, NORDUnet A/S.
%%% See LICENSE for licensing information.
%%% @doc Certificate Transparency (RFC 6962)
-module(v1).
%% API (URL)
-export(['add-chain'/3, 'add-pre-chain'/3, 'get-sth'/3,
'get-sth-consistency'/3, 'get-proof-by-hash'/3, 'get-entries'/3,
'get-roots'/3, 'get-entry-and-proof'/3]).
%% Testing -- FIXME: remove
-export([hello/3]).
-include("$CTROOT/plop/include/plop.hrl").
-define(PROTOCOL_VERSION, 0).
%% Public functions, i.e. part of URL.
'add-chain'(SessionID, _Env, Input) ->
R = case (catch jiffy:decode(Input)) of
{error, E} ->
html("add-chain: bad input:", E);
{[{<<"chain">>, ChainBase64}]} ->
case (catch [base64:decode(X) || X <- ChainBase64]) of
{'EXIT', _} ->
html("add-chain: invalid base64-encoded chain: ",
[ChainBase64]);
[LeafCert | CertChain] ->
Entry = #plop_entry{type = x509, data = LeafCert},
SPT = plop:add(#timestamped_entry{entry = Entry},
list_to_binary(CertChain)),
R2 = [{sct_version, ?PROTOCOL_VERSION},
{id, base64:encode(SPT#spt.logid)},
{timestamp, SPT#spt.timestamp},
{extensions, base64:encode("")},
{signature, base64:encode(
plop:serialise(SPT#spt.signature))}],
binary_to_list(jiffy:encode({R2}));
Invalid ->
html("add-chain: chain is not a list: ", [Invalid])
end;
_ -> html("add-chain: missing input: chain", Input)
end,
deliver(SessionID, R).
'add-pre-chain'(SessionID, _Env, _Input) ->
niy(SessionID).
'get-sth'(SessionID, _Env, _Input) ->
#sth{
treesize = Treesize,
timestamp = Timestamp,
roothash = Roothash,
signature = Signature} = plop:sth(),
R = [{tree_size, Treesize},
{timestamp, Timestamp},
{sha256_root_hash, base64:encode(Roothash)},
{tree_head_signature, base64:encode(
plop:serialise(Signature))}],
deliver(SessionID, binary_to_list(jiffy:encode({R}))).
'get-sth-consistency'(SessionID, _Env, Input) ->
R = case lists:sort(httpd:parse_query(Input)) of
[{"first", FirstInput}, {"second", SecondInput}] ->
{First, _} = string:to_integer(FirstInput),
{Second, _} = string:to_integer(SecondInput),
case lists:member(error, [First, Second]) of
true ->
html("get-sth-consistency: bad input:",
[FirstInput, SecondInput]);
false ->
binary_to_list(
jiffy:encode(
{[{consistency,
[base64:encode(X) ||
X <- plop:consistency(First, Second)]}]}))
end;
_ -> html("get-sth-consistency: bad input:", Input)
end,
deliver(SessionID, R).
'get-proof-by-hash'(SessionID, _Env, Input) ->
R = case lists:sort(httpd:parse_query(Input)) of
[{"hash", HashInput}, {"tree_size", TreeSizeInput}] ->
Hash = case (catch base64:decode(HashInput)) of
{'EXIT', _} -> error;
H -> H
end,
{TreeSize, _} = string:to_integer(TreeSizeInput),
case lists:member(error, [Hash, TreeSize]) of
true ->
html("get-proof-by-hash: bad input:",
[HashInput, TreeSizeInput]);
false ->
binary_to_list(
jiffy:encode(
case plop:inclusion(Hash, TreeSize) of
{ok, Index, Path} ->
{[{leaf_index, Index},
{audit_path,
[base64:encode(X) || X <- Path]}]};
{notfound, Msg} ->
%% FIXME: http status 400
{[{success, false},
{error_message, list_to_binary(Msg)}]}
end))
end;
_ -> html("get-proof-by-hash: bad input:", Input)
end,
deliver(SessionID, R).
'get-entries'(SessionID, _Env, Input) ->
%% TODO: Limit the number of returned entreis (i.e. start-end) to
%% something reasonable.
R = case lists:sort(httpd:parse_query(Input)) of
[{"end", EndInput}, {"start", StartInput}] ->
{Start, _} = string:to_integer(StartInput),
{End, _} = string:to_integer(EndInput),
case lists:member(error, [Start, End]) of
true -> html("get-entries: bad input:", [Start, End]);
false -> encode_entries(plop:get(Start, End))
end;
_ -> html("get-entries: bad input:", Input)
end,
deliver(SessionID, R).
'get-entry-and-proof'(SessionID, _Env, Input) ->
R = case lists:sort(httpd:parse_query(Input)) of
[{"leaf_index", IndexInput}, {"tree_size", TreeSizeInput}] ->
{Index, _} = string:to_integer(IndexInput),
{TreeSize, _} = string:to_integer(TreeSizeInput),
case lists:member(error, [Index, TreeSize]) of
true ->
html("get-entry-and-proof: not integers: ",
[IndexInput, TreeSizeInput]);
false ->
binary_to_list(
jiffy:encode(
case plop:inclusion_and_more(Index, TreeSize) of
{ok, Leaf, Chain, Path} ->
{[{leaf_input,
base64:encode(plop:serialise(Leaf))},
{extra_data, base64:encode(Chain)},
{audit_path,
[base64:encode(X) || X <- Path]}]};
{notfound, Msg} ->
{[{success, false},
{error_message, list_to_binary(Msg)}]}
end))
end;
_ -> html("get-entry-and-proof: bad input:", Input)
end,
deliver(SessionID, R).
'get-roots'(SessionID, _Env, _Input) ->
R = [{certificates, []}], % NIY.
deliver(SessionID, binary_to_list(jiffy:encode({R}))).
%% For testing. FIXME: Remove.
hello(SessionID, Env, Input) ->
Query = httpd:parse_query(Input),
mod_esi:deliver(SessionID, io_lib:format(
"Content-Type: text/html\r\n\r\n" ++
"<html><body>hello again, erlang world" ++
"<p>SessionID: ~p~n" ++
"<p>Env: ~p~n" ++
"<p>Input, raw: ~p~n" ++
"<p>Input, parsed: ~p~n" ++
"</body></html>",
[SessionID, Env, Input, Query])).
%% Private functions.
-spec encode_entries([{mtl(), binary()}]) -> list().
encode_entries(Entries) ->
binary_to_list(jiffy:encode({[{entries, unpack_entries(Entries)}]})).
-spec unpack_entries([{mtl(), binary()}]) -> list().
unpack_entries([]) ->
[];
unpack_entries([H|T]) ->
{MTL, Extra} = H,
LeafInput = base64:encode(plop:serialise(MTL)),
ExtraData = base64:encode(Extra),
[{[{leaf_input, LeafInput}, {extra_data, ExtraData}]} | unpack_entries(T)].
html(Text, Input) ->
io_lib:format(
"Content-Type: text/html\r\n\r\n" ++
"<html><body><p>~n" ++
"~s~n" ++
"~p~n" ++
"</body></html>~n", [Text, Input]).
niy(S) ->
mod_esi:deliver(S, html("NIY - Not Yet Implemented|", [])).
-spec deliver(any(), string()) -> ok | {error, _Reason}.
deliver(Session, Data) ->
mod_esi:deliver(Session, Data).
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