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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 Developer of the Original Code is VMware, Inc.
%% Copyright (c) 2007-2011 VMware, Inc. All rights reserved.
%%
-module(rabbit_ssl).
-include("rabbit.hrl").
-include_lib("public_key/include/public_key.hrl").
-export([peer_cert_issuer/1, peer_cert_subject/1, peer_cert_validity/1]).
-export([peer_cert_subject_item/2]).
%%--------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([certificate/0]).
-type(certificate() :: binary()).
-spec(peer_cert_issuer/1 :: (certificate()) -> string()).
-spec(peer_cert_subject/1 :: (certificate()) -> string()).
-spec(peer_cert_validity/1 :: (certificate()) -> string()).
-spec(peer_cert_subject_item/2 ::
(certificate(), tuple()) -> string() | 'not_found').
-endif.
%%--------------------------------------------------------------------------
%% High-level functions used by reader
%%--------------------------------------------------------------------------
%% Return a string describing the certificate's issuer.
peer_cert_issuer(Cert) ->
cert_info(fun(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
issuer = Issuer }}) ->
format_rdn_sequence(Issuer)
end, Cert).
%% Return a string describing the certificate's subject, as per RFC4514.
peer_cert_subject(Cert) ->
cert_info(fun(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
subject = Subject }}) ->
format_rdn_sequence(Subject)
end, Cert).
%% Return a part of the certificate's subject.
peer_cert_subject_item(Cert, Type) ->
cert_info(fun(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
subject = Subject }}) ->
find_by_type(Type, Subject)
end, Cert).
%% Return a string describing the certificate's validity.
peer_cert_validity(Cert) ->
cert_info(fun(#'OTPCertificate' {
tbsCertificate = #'OTPTBSCertificate' {
validity = {'Validity', Start, End} }}) ->
lists:flatten(
io_lib:format("~s - ~s", [format_asn1_value(Start),
format_asn1_value(End)]))
end, Cert).
%%--------------------------------------------------------------------------
cert_info(F, Cert) ->
F(case public_key:pkix_decode_cert(Cert, otp) of
{ok, DecCert} -> DecCert; %%pre R14B
DecCert -> DecCert %%R14B onwards
end).
find_by_type(Type, {rdnSequence, RDNs}) ->
case [V || #'AttributeTypeAndValue'{type = T, value = V}
<- lists:flatten(RDNs),
T == Type] of
[{ST, S}] when ST =:= teletexString; ST =:= printableString;
ST =:= universalString; ST =:= utf8String;
ST =:= bmpString -> format_directory_string(ST, S);
[] -> not_found
end.
%%--------------------------------------------------------------------------
%% Formatting functions
%%--------------------------------------------------------------------------
%% Format and rdnSequence as a RFC4514 subject string.
format_rdn_sequence({rdnSequence, Seq}) ->
string:join(lists:reverse([format_complex_rdn(RDN) || RDN <- Seq]), ",").
%% Format an RDN set.
format_complex_rdn(RDNs) ->
string:join([format_rdn(RDN) || RDN <- RDNs], "+").
%% Format an RDN. If the type name is unknown, use the dotted decimal
%% representation. See RFC4514, section 2.3.
format_rdn(#'AttributeTypeAndValue'{type = T, value = V}) ->
FV = escape_rdn_value(format_asn1_value(V)),
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(T, Fmts) of
{_, Fmt} ->
io_lib:format(Fmt ++ "=~s", [FV]);
none when is_tuple(T) ->
TypeL = [io_lib:format("~w", [X]) || X <- tuple_to_list(T)],
io_lib:format("~s:~s", [string:join(TypeL, "."), FV]);
none ->
io_lib:format("~p:~s", [T, FV])
end.
%% Escape a string as per RFC4514.
escape_rdn_value(V) ->
escape_rdn_value(V, start).
escape_rdn_value([], _) ->
[];
escape_rdn_value([C | S], start) when C =:= $ ; C =:= $# ->
[$\\, C | escape_rdn_value(S, middle)];
escape_rdn_value(S, start) ->
escape_rdn_value(S, middle);
escape_rdn_value([$ ], middle) ->
[$\\, $ ];
escape_rdn_value([C | S], middle) when C =:= $"; C =:= $+; C =:= $,; C =:= $;;
C =:= $<; C =:= $>; C =:= $\\ ->
[$\\, C | escape_rdn_value(S, middle)];
escape_rdn_value([C | S], middle) when C < 32 ; C =:= 127 ->
%% only U+0000 needs escaping, but for display purposes it's handy
%% to escape all non-printable chars
lists:flatten(io_lib:format("\\~2.16.0B", [C])) ++
escape_rdn_value(S, middle);
escape_rdn_value([C | S], middle) ->
[C | escape_rdn_value(S, middle)].
%% Get the string representation of an OTPCertificate field.
format_asn1_value({ST, S}) when ST =:= teletexString; ST =:= printableString;
ST =:= universalString; ST =:= utf8String;
ST =:= bmpString ->
if is_binary(S) -> format_directory_string(ST, binary_to_list(S));
true -> format_directory_string(ST, S)
end;
format_asn1_value({utcTime, [Y1, Y2, M1, M2, D1, D2, H1, H2,
Min1, Min2, S1, S2, $Z]}) ->
io_lib:format("20~c~c-~c~c-~c~cT~c~c:~c~c:~c~cZ",
[Y1, Y2, M1, M2, D1, D2, H1, H2, Min1, Min2, S1, S2]);
format_asn1_value(V) ->
io_lib:format("~p", [V]).
%% DirectoryString { INTEGER : maxSize } ::= CHOICE {
%% teletexString TeletexString (SIZE (1..maxSize)),
%% printableString PrintableString (SIZE (1..maxSize)),
%% bmpString BMPString (SIZE (1..maxSize)),
%% universalString UniversalString (SIZE (1..maxSize)),
%% uTF8String UTF8String (SIZE (1..maxSize)) }
%%
%% Precise definitions of printable / teletexString are hard to come
%% by. This is what I reconstructed:
%%
%% printableString:
%% "intended to represent the limited character sets available to
%% mainframe input terminals"
%% A-Z a-z 0-9 ' ( ) + , - . / : = ? [space]
%% http://msdn.microsoft.com/en-us/library/bb540814(v=vs.85).aspx
%%
%% teletexString:
%% "a sizable volume of software in the world treats TeletexString
%% (T61String) as a simple 8-bit string with mostly Windows Latin 1
%% (superset of iso-8859-1) encoding"
%% http://www.mail-archive.com/asn1@asn1.org/msg00460.html
%%
%% (However according to that link X.680 actually defines
%% TeletexString in some much more involved and crazy way. I suggest
%% we treat it as Windows CP1252).
%%
%% bmpString:
%% UCS-2 according to RFC 3641. Hence cannot represent unicode characters
%% above 65535.
%%
%% universalString:
%% UCS-4 according to RFC 3641.
%%
%% utf8String:
%% UTF-8 according to RFC 3641.
%%
%% Within Rabbit we assume UTF-8 encoding. Since printableString is a
%% subset of ASCII it is also a subset of UTF-8. The others need
%% converting.
%%
%% Note for testing: the default Ubuntu configuration for openssl will
%% only create printableString or teletexString types no matter what
%% you do. Edit string_mask in the [req] section of
%% /etc/ssl/openssl.cnf to change this (see comments there). You
%% probably also need to set utf8 = yes to get it to accept UTF-8 on
%% the command line.
%%
%% TODO actually convert stuff here.
format_directory_string(printableString, S) -> S;
format_directory_string(teletexString, S) -> S;
format_directory_string(bmpString, S) -> S;
format_directory_string(universalString, S) -> S;
format_directory_string(utf8String, S) -> S.
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