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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_control_pbe).
-export([decode/4, encode/4, list_ciphers/0, list_hashes/0]).
% for testing purposes
-export([evaluate_input_as_term/1]).
list_ciphers() ->
{ok, io_lib:format("~p", [rabbit_pbe:supported_ciphers()])}.
list_hashes() ->
{ok, io_lib:format("~p", [rabbit_pbe:supported_hashes()])}.
validate(_Cipher, _Hash, Iterations, _Args) when Iterations =< 0 ->
{error, io_lib:format("The requested number of iterations is incorrect", [])};
validate(_Cipher, _Hash, _Iterations, Args) when length(Args) < 2 ->
{error, io_lib:format("Please provide a value to encode/decode and a passphrase", [])};
validate(_Cipher, _Hash, _Iterations, Args) when length(Args) > 2 ->
{error, io_lib:format("Too many arguments. Please provide a value to encode/decode and a passphrase", [])};
validate(Cipher, Hash, _Iterations, _Args) ->
case lists:member(Cipher, rabbit_pbe:supported_ciphers()) of
false ->
{error, io_lib:format("The requested cipher is not supported", [])};
true ->
case lists:member(Hash, rabbit_pbe:supported_hashes()) of
false ->
{error, io_lib:format("The requested hash is not supported", [])};
true -> ok
end
end.
encode(Cipher, Hash, Iterations, Args) ->
case validate(Cipher, Hash, Iterations, Args) of
{error, Err} -> {error, Err};
ok ->
[Value, PassPhrase] = Args,
try begin
TermValue = evaluate_input_as_term(Value),
Result = {encrypted, _} = rabbit_pbe:encrypt_term(Cipher, Hash, Iterations,
list_to_binary(PassPhrase), TermValue),
{ok, io_lib:format("~p", [Result])}
end
catch
_:Msg -> {error, io_lib:format("Error during cipher operation: ~p", [Msg])}
end
end.
decode(Cipher, Hash, Iterations, Args) ->
case validate(Cipher, Hash, Iterations, Args) of
{error, Err} -> {error, Err};
ok ->
[Value, PassPhrase] = Args,
try begin
TermValue = evaluate_input_as_term(Value),
TermToDecrypt = case TermValue of
{encrypted, _}=EncryptedTerm ->
EncryptedTerm;
_ ->
{encrypted, TermValue}
end,
Result = rabbit_pbe:decrypt_term(Cipher, Hash, Iterations,
list_to_binary(PassPhrase),
TermToDecrypt),
{ok, io_lib:format("~p", [Result])}
end
catch
_:Msg -> {error, io_lib:format("Error during cipher operation: ~p", [Msg])}
end
end.
evaluate_input_as_term(Input) ->
{ok,Tokens,_EndLine} = erl_scan:string(Input ++ "."),
{ok,AbsForm} = erl_parse:parse_exprs(Tokens),
{value,TermValue,_Bs} = erl_eval:exprs(AbsForm, erl_eval:new_bindings()),
TermValue.
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