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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2010 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2010 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_ssl).
-include_lib("public_key/include/public_key.hrl").
-include_lib("ssl/src/ssl_int.hrl").
-export([ssl_issuer/1, ssl_subject/1, ssl_validity/1, ssl_info/2]).
%%--------------------------------------------------------------------------
-ifdef(use_specs).
-type(ssl_info_fun() :: fun((#'OTPCertificate'{}) -> string())).
-spec(ssl_info/2 :: (ssl_info_fun(), #'sslsocket'{}) -> any()).
-spec(ssl_issuer/1 :: (#'OTPCertificate'{}) -> string()).
-spec(ssl_subject/1 :: (#'OTPCertificate'{}) -> string()).
-spec(ssl_validity/1 :: (#'OTPCertificate'{}) -> string()).
-endif. %% use_specs
%%--------------------------------------------------------------------------
%% High-level functions used by reader
%%--------------------------------------------------------------------------
%% Wrapper for applying a function to a socket's certificate.
ssl_info(F, Sock) ->
case rabbit_net:peercert(Sock) of
nossl -> nossl;
no_peer_certificate -> no_peer_certificate;
{ok, Cert} ->
try F(Cert) %% here be dragons; decompose an undocumented
%% structure
catch
C:E ->
rabbit_log:info("Problems while processing SSL info: ~p:~p~n",
[C, E]),
unknown
end
end.
%% Return a string describing the certificate's issuer.
ssl_issuer(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
issuer = Issuer }}) ->
format_ssl_subject(extract_ssl_values(Issuer)).
%% Return a string describing the certificate's subject, as per RFC4514.
ssl_subject(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
subject = Subject }}) ->
format_ssl_subject(extract_ssl_values(Subject)).
%% Return a string describing the certificate's validity.
ssl_validity(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
validity = Validity }}) ->
case extract_ssl_values(Validity) of
{'Validity', Start, End} ->
io_lib:format("~s to ~s", [format_ssl_value(Start),
format_ssl_value(End)]);
V ->
io_lib:format("~p", [V])
end.
%%--------------------------------------------------------------------------
%% Functions for extracting information from OTPCertificates
%%--------------------------------------------------------------------------
%% Convert OTPCertificate fields to something easier to use.
extract_ssl_values({rdnSequence, List}) ->
extract_ssl_values_list(List);
extract_ssl_values(V) ->
V.
%% Convert an rdnSequeuence list to a proplist.
extract_ssl_values_list([[#'AttributeTypeAndValue'{type = T, value = V}]
| Rest]) ->
[{T, V} | extract_ssl_values_list(Rest)];
extract_ssl_values_list([V|_]) ->
throw({unknown_rdnSequence_element, V});
extract_ssl_values_list([]) ->
[].
%%--------------------------------------------------------------------------
%% Formatting functions
%%--------------------------------------------------------------------------
%% Convert a proplist to a RFC4514 subject string.
format_ssl_subject(RDNs) ->
rabbit_misc:intersperse(
",", lists:reverse(
[escape_ssl_string(format_ssl_type_and_value(T, V), start)
|| {T, V} <- RDNs])).
%% Escape a string as per RFC4514.
escape_ssl_string([], _) ->
[];
escape_ssl_string([$ | S], start) ->
["\\ " | escape_ssl_string(S, start)];
escape_ssl_string([$# | S], start) ->
["\\#" | escape_ssl_string(S, start)];
escape_ssl_string(S, start) ->
escape_ssl_string(S, middle);
escape_ssl_string([$ | S], middle) ->
case lists:filter(fun(C) -> C =/= $ end, S) of
[] -> escape_ssl_string([$ | S], ending);
[_|_] -> [" " | escape_ssl_string(S, middle)]
end;
escape_ssl_string([C | S], middle) ->
case lists:member(C, ",+\"\\<>;") of
false -> [C | escape_ssl_string(S, middle)];
true -> ["\\", C | escape_ssl_string(S, middle)]
end;
escape_ssl_string([$ | S], ending) ->
["\\ " | escape_ssl_string(S, ending)].
%% Format a type-value pair as an RDN. If the type name is unknown,
%% use the dotted decimal representation. See RFC4514, section 2.3.
format_ssl_type_and_value(Type, Value) ->
FV = format_ssl_value(Value),
Fmts = [{?'id-at-surname' , "SN"},
{?'id-at-givenName' , "GIVENNAME"},
{?'id-at-initials' , "INITIALS"},
{?'id-at-generationQualifier' , "GENERATIONQUALIFIER"},
{?'id-at-commonName' , "CN"},
{?'id-at-localityName' , "L"},
{?'id-at-stateOrProvinceName' , "ST"},
{?'id-at-organizationName' , "O"},
{?'id-at-organizationalUnitName' , "OU"},
{?'id-at-title' , "TITLE"},
{?'id-at-countryName' , "C"},
{?'id-at-serialNumber' , "SERIALNUMBER"},
{?'id-at-pseudonym' , "PSEUDONYM"},
{?'id-domainComponent' , "DC"},
{?'id-emailAddress' , "EMAILADDRESS"},
{?'street-address' , "STREET"}],
case proplists:lookup(Type, Fmts) of
{_, Fmt} ->
io_lib:format(Fmt ++ "=~s", [FV]);
none when is_tuple(Type) ->
TypeL = [io_lib:format("~w", [X]) || X <- tuple_to_list(Type)],
io_lib:format("~s:~s", [rabbit_misc:intersperse(".", TypeL), FV]);
none ->
io_lib:format("~p:~s", [Type, FV])
end.
%% Get the string representation of an OTPCertificate field.
format_ssl_value({printableString, S}) ->
S;
format_ssl_value({utf8String, Bin}) ->
binary:bin_to_list(Bin);
format_ssl_value({utcTime, [Y1, Y2, M1, M2, D1, D2, H1, H2,
Min1, Min2, S1, S2, $Z]}) ->
io_lib:format("20~c~c-~c~c-~c~c ~c~c:~c~c:~c~c",
[Y1, Y2, M1, M2, D1, D2, H1, H2, Min1, Min2, S1, S2]);
format_ssl_value(V) ->
io_lib:format("~p", [V]).
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