Packages

erldns

10.5.1
11.0.2 11.0.1 11.0.0 10.6.0 10.5.6 10.5.5 10.5.4 10.5.3 10.5.2 10.5.1 10.5.0 10.4.4 10.4.3 10.4.2 10.4.1 10.4.0 10.3.0 10.2.1 10.2.0 10.1.0 10.0.0 10.0.0-rc4 10.0.0-rc3 10.0.0-rc2 10.0.0-rc1 9.1.0 9.0.0 9.0.0-rc3 9.0.0-rc2 9.0.0-rc1 8.1.0 8.0.0 8.0.0-rc6 8.0.0-rc5 8.0.0-rc4 8.0.0-rc3 8.0.0-rc2 8.0.0-rc1 7.0.0 7.0.0-rc9 7.0.0-rc8 7.0.0-rc7 7.0.0-rc6 7.0.0-rc5 7.0.0-rc4 7.0.0-rc3 7.0.0-rc2 7.0.0-rc12 7.0.0-rc11 7.0.0-rc10 7.0.0-rc1 6.0.2 6.0.1 6.0.0 5.0.0 4.3.1 4.3.0 4.2.4 4.2.3 4.2.2 4.2.1 4.2.0 4.1.2 4.1.1 4.1.0 4.0.0 3.0.0 1.0.0

Erlang Authoritative DNS Server

HexDocs

Current section

Files

Jump to
Readme
68 Versions
7 Dependencies
Dependants
Files
Activity
erldns src admin erldns_admin_auth_middleware.erl
Raw

src/admin/erldns_admin_auth_middleware.erl 

-module(erldns_admin_auth_middleware).

-moduledoc false.



-behaviour(cowboy_middleware).



-export([execute/2]).



-spec execute(Req, Env) -> {ok, Req, Env} | {stop, Req} when

    Req :: cowboy_req:req(),

    Env :: cowboy_middleware:env().

execute(Req0, #{credentials := {Username, Password}} = Env) ->

    case is_authorized(Req0, Username, Password) of

        true ->

            {ok, Req0, Env};

        {false, WwwAuthenticateHeader} ->

            Req1 = set_www_authenticate_header(Req0, WwwAuthenticateHeader),

            Req2 = maybe_delete_resp_header(Req1),

            Req3 = reply_unauthorized(Req2),

            {stop, Req3}

    end.



-spec is_authorized(cowboy_req:req(), binary(), binary()) -> true | {false, iodata()}.

is_authorized(Req, ValidUsername, ValidPassword) ->

    case cowboy_req:parse_header(~"authorization", Req) of

        {basic, GivenUsername, GivenPassword} ->

            is_authorized(GivenUsername, GivenPassword, ValidUsername, ValidPassword) orelse

                {false, ~"basic realm=\"erldns admin\""};

        _ ->

            {false, ~"basic realm=\"erldns admin\""}

    end.



-spec is_authorized(dynamic(), dynamic(), dynamic(), dynamic()) -> boolean().

is_authorized(GivenUsername, GivenPassword, ValidUsername, ValidPassword) ->

    is_binary_of_equal_size(GivenUsername, ValidUsername) andalso

        is_binary_of_equal_size(GivenPassword, ValidPassword) andalso

        crypto:hash_equals(GivenUsername, ValidUsername) andalso

        crypto:hash_equals(GivenPassword, ValidPassword).



-compile({inline, [is_binary_of_equal_size/2]}).

-spec is_binary_of_equal_size(dynamic(), dynamic()) -> boolean().

is_binary_of_equal_size(Bin1, Bin2) ->

    is_binary(Bin1) andalso is_binary(Bin2) andalso byte_size(Bin1) =:= byte_size(Bin2).



-spec set_www_authenticate_header(cowboy_req:req(), iodata()) -> cowboy_req:req().

set_www_authenticate_header(Req, WwwAuthenticateHeader) ->

    cowboy_req:set_resp_header(~"www-authenticate", WwwAuthenticateHeader, Req).



-spec maybe_delete_resp_header(cowboy_req:req()) -> cowboy_req:req().

maybe_delete_resp_header(Req) ->

    case cowboy_req:has_resp_body(Req) of

        true -> Req;

        false -> cowboy_req:delete_resp_header(~"content-type", Req)

    end.



-spec reply_unauthorized(cowboy_req:req()) -> cowboy_req:req().

reply_unauthorized(Req) ->

    cowboy_req:reply(401, Req).