1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
%%%----------------------------------------------------------------------
%%% File : eldap_utils.erl
%%% Author : Mickael Remond <mremond@process-one.net>
%%% Purpose : ejabberd LDAP helper functions
%%% Created : 12 Oct 2006 by Mickael Remond <mremond@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2021 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(eldap_utils).
-author('mremond@process-one.net').
-export([generate_subfilter/1, find_ldap_attrs/2, check_filter/1,
get_ldap_attr/2, get_user_part/2, make_filter/2,
get_state/2, case_insensitive_match/2,
decode_octet_string/3, uids_domain_subst/2]).
-include("logger.hrl").
-include("eldap.hrl").
%% Generate an 'or' LDAP query on one or several attributes
%% If there is only one attribute
generate_subfilter([UID]) ->
subfilter(UID);
%% If there is several attributes
generate_subfilter(UIDs) ->
iolist_to_binary(["(|", [subfilter(UID) || UID <- UIDs], ")"]).
%% Subfilter for a single attribute
subfilter({UIDAttr, UIDAttrFormat}) ->
%% The default UiDAttrFormat is %u
<<$(, UIDAttr/binary, $=, UIDAttrFormat/binary, $)>>;
%% The default UiDAttrFormat is <<"%u">>
subfilter({UIDAttr}) ->
<<$(, UIDAttr/binary, $=, "%u)">>.
%% Not tail-recursive, but it is not very terribly.
%% It stops finding on the first not empty value.
-spec find_ldap_attrs([{binary()} | {binary(), binary()}],
[{binary(), [binary()]}]) -> <<>> | {binary(), binary()}.
find_ldap_attrs([{Attr} | Rest], Attributes) ->
find_ldap_attrs([{Attr, <<"%u">>} | Rest], Attributes);
find_ldap_attrs([{Attr, Format} | Rest], Attributes) ->
case get_ldap_attr(Attr, Attributes) of
Value when is_binary(Value), Value /= <<>> ->
{Value, Format};
_ ->
find_ldap_attrs(Rest, Attributes)
end;
find_ldap_attrs([], _) ->
<<>>.
-spec get_ldap_attr(binary(), [{binary(), [binary()]}]) -> binary().
get_ldap_attr(LDAPAttr, Attributes) ->
Res = lists:filter(
fun({Name, _}) ->
case_insensitive_match(Name, LDAPAttr)
end, Attributes),
case Res of
[{_, [Value|_]}] -> Value;
_ -> <<>>
end.
-spec get_user_part(binary(), binary()) -> {ok, binary()} | {error, badmatch}.
get_user_part(String, Pattern) ->
F = fun(S, P) ->
First = str:str(P, <<"%u">>),
TailLength = byte_size(P) - (First+1),
str:sub_string(S, First, byte_size(S) - TailLength)
end,
case catch F(String, Pattern) of
{'EXIT', _} ->
{error, badmatch};
Result ->
case catch ejabberd_regexp:replace(Pattern, <<"%u">>, Result) of
{'EXIT', _} ->
{error, badmatch};
StringRes ->
case case_insensitive_match(StringRes, String) of
true ->
{ok, Result};
false ->
{error, badmatch}
end
end
end.
-spec make_filter([{binary(), [binary()]}], [{binary(), binary()}]) -> any().
make_filter(Data, UIDs) ->
NewUIDs = [{U, eldap_filter:do_sub(
UF, [{<<"%u">>, <<"*%u*">>, 1}])} || {U, UF} <- UIDs],
Filter = lists:flatmap(
fun({Name, [Value | _]}) ->
case Name of
<<"%u">> when Value /= <<"">> ->
case eldap_filter:parse(
generate_subfilter(NewUIDs),
[{<<"%u">>, Value}]) of
{ok, F} -> [F];
_ -> []
end;
_ when Value /= <<"">> ->
[eldap:substrings(
Name,
[{any, Value}])];
_ ->
[]
end
end, Data),
case Filter of
[F] ->
F;
_ ->
eldap:'and'(Filter)
end.
check_filter(F) ->
NewF = iolist_to_binary(F),
{ok, _} = eldap_filter:parse(NewF),
NewF.
-spec case_insensitive_match(binary(), binary()) -> boolean().
case_insensitive_match(X, Y) ->
X1 = str:to_lower(X),
Y1 = str:to_lower(Y),
if
X1 == Y1 -> true;
true -> false
end.
get_state(Server, Module) ->
Proc = gen_mod:get_module_proc(Server, Module),
gen_server:call(Proc, get_state).
%% From the list of uids attribute:
%% we look from alias domain (%d) and make the substitution
%% with the actual host domain
%% This help when you need to configure many virtual domains.
-spec uids_domain_subst(binary(), [{binary(), binary()}]) ->
[{binary(), binary()}].
uids_domain_subst(Host, UIDs) ->
lists:map(fun({U,V}) ->
{U, eldap_filter:do_sub(V,[{<<"%d">>, Host}])};
(A) -> A
end,
UIDs).
%%----------------------------------------
%% Borrowed from asn1rt_ber_bin_v2.erl
%%----------------------------------------
%%% The tag-number for universal types
-define(N_BOOLEAN, 1).
-define(N_INTEGER, 2).
-define(N_BIT_STRING, 3).
-define(N_OCTET_STRING, 4).
-define(N_NULL, 5).
-define(N_OBJECT_IDENTIFIER, 6).
-define(N_OBJECT_DESCRIPTOR, 7).
-define(N_EXTERNAL, 8).
-define(N_REAL, 9).
-define(N_ENUMERATED, 10).
-define(N_EMBEDDED_PDV, 11).
-define(N_SEQUENCE, 16).
-define(N_SET, 17).
-define(N_NumericString, 18).
-define(N_PrintableString, 19).
-define(N_TeletexString, 20).
-define(N_VideotexString, 21).
-define(N_IA5String, 22).
-define(N_UTCTime, 23).
-define(N_GeneralizedTime, 24).
-define(N_GraphicString, 25).
-define(N_VisibleString, 26).
-define(N_GeneralString, 27).
-define(N_UniversalString, 28).
-define(N_BMPString, 30).
decode_octet_string(Buffer, Range, Tags) ->
% NewTags = new_tags(HasTag,#tag{class=?UNIVERSAL,number=?N_OCTET_STRING}),
decode_restricted_string(Buffer, Range, Tags).
decode_restricted_string(Tlv, Range, TagsIn) ->
Val = match_tags(Tlv, TagsIn),
Val2 =
case Val of
PartList = [_H|_T] -> % constructed val
collect_parts(PartList);
Bin ->
Bin
end,
check_and_convert_restricted_string(Val2, Range).
check_and_convert_restricted_string(Val, Range) ->
{StrLen,NewVal} = if is_binary(Val) ->
{size(Val), Val};
true ->
{length(Val), list_to_binary(Val)}
end,
case Range of
[] -> % No length constraint
NewVal;
{Lb,Ub} when StrLen >= Lb, Ub >= StrLen -> % variable length constraint
NewVal;
{{Lb,_Ub},[]} when StrLen >= Lb ->
NewVal;
{{Lb,_Ub},_Ext=[Min|_]} when StrLen >= Lb; StrLen >= Min ->
NewVal;
{{Lb1,Ub1},{Lb2,Ub2}} when StrLen >= Lb1, StrLen =< Ub1;
StrLen =< Ub2, StrLen >= Lb2 ->
NewVal;
StrLen -> % fixed length constraint
NewVal;
{_,_} ->
exit({error,{asn1,{length,Range,Val}}});
_Len when is_integer(_Len) ->
exit({error,{asn1,{length,Range,Val}}});
_ -> % some strange constraint that we don't support yet
NewVal
end.
%%----------------------------------------
%% Decode the in buffer to bits
%%----------------------------------------
match_tags({T,V},[T]) ->
V;
match_tags({T,V}, [T|Tt]) ->
match_tags(V,Tt);
match_tags([{T,V}],[T|Tt]) ->
match_tags(V, Tt);
match_tags(Vlist = [{T,_V}|_], [T]) ->
Vlist;
match_tags(Tlv, []) ->
Tlv;
match_tags({Tag,_V},[T|_Tt]) ->
{error,{asn1,{wrong_tag,{Tag,T}}}}.
collect_parts(TlvList) ->
collect_parts(TlvList,[]).
collect_parts([{_,L}|Rest],Acc) when is_list(L) ->
collect_parts(Rest,[collect_parts(L)|Acc]);
collect_parts([{?N_BIT_STRING,<<Unused,Bits/binary>>}|Rest],_Acc) ->
collect_parts_bit(Rest,[Bits],Unused);
collect_parts([{_T,V}|Rest],Acc) ->
collect_parts(Rest,[V|Acc]);
collect_parts([],Acc) ->
list_to_binary(lists:reverse(Acc)).
collect_parts_bit([{?N_BIT_STRING,<<Unused,Bits/binary>>}|Rest],Acc,Uacc) ->
collect_parts_bit(Rest,[Bits|Acc],Unused+Uacc);
collect_parts_bit([],Acc,Uacc) ->
list_to_binary([Uacc|lists:reverse(Acc)]).
|
