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
|
%%%----------------------------------------------------------------------
%%% File : cyrsasl.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Cyrus SASL-like library
%%% Created : 8 Mar 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(cyrsasl).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([start/0,
register_mechanism/3,
listmech/1,
server_new/6,
server_start/3,
server_step/2]).
-record(sasl_mechanism, {mechanism, module, require_plain_password}).
-record(sasl_state, {service, myname, realm,
get_password, check_password,
mech_mod, mech_state}).
-export([behaviour_info/1]).
behaviour_info(callbacks) ->
[{mech_new, 3}, {mech_step, 2}];
behaviour_info(Other) ->
undefined.
start() ->
ets:new(sasl_mechanism, [named_table,
public,
{keypos, #sasl_mechanism.mechanism}]),
cyrsasl_plain:start([]),
cyrsasl_digest:start([]),
cyrsasl_anonymous:start([]),
ok.
register_mechanism(Mechanism, Module, RequirePlainPassword) ->
ets:insert(sasl_mechanism,
#sasl_mechanism{mechanism = Mechanism,
module = Module,
require_plain_password = RequirePlainPassword}).
% TODO: use callbacks
-include("ejabberd.hrl").
-include("jlib.hrl").
check_authzid(State, Props) ->
AuthzId = xml:get_attr_s(authzid, Props),
case jlib:string_to_jid(AuthzId) of
error ->
{error, "invalid-authzid"};
JID ->
LUser = jlib:nodeprep(xml:get_attr_s(username, Props)),
{U, S, R} = jlib:jid_tolower(JID),
case R of
"" ->
{error, "invalid-authzid"};
_ ->
case {LUser, ?MYNAME} of
{U, S} ->
ok;
_ ->
{error, "invalid-authzid"}
end
end
end.
check_credentials(State, Props) ->
User = xml:get_attr_s(username, Props),
case jlib:nodeprep(User) of
error ->
{error, "not-authorized"};
"" ->
{error, "not-authorized"};
LUser ->
ok
end.
listmech(Host) ->
RequirePlainPassword = ejabberd_auth:plain_password_required(Host),
Mechs = ets:select(sasl_mechanism,
[{#sasl_mechanism{mechanism = '$1',
require_plain_password = '$2',
_ = '_'},
if
RequirePlainPassword ->
[{'==', '$2', false}];
true ->
[]
end,
['$1']}]),
filter_anonymous(Host, Mechs).
server_new(Service, ServerFQDN, UserRealm, SecFlags,
GetPassword, CheckPassword) ->
#sasl_state{service = Service,
myname = ServerFQDN,
realm = UserRealm,
get_password = GetPassword,
check_password = CheckPassword}.
server_start(State, Mech, ClientIn) ->
case lists:member(Mech, listmech(State#sasl_state.myname)) of
true ->
case ets:lookup(sasl_mechanism, Mech) of
[#sasl_mechanism{module = Module}] ->
{ok, MechState} = Module:mech_new(
State#sasl_state.myname,
State#sasl_state.get_password,
State#sasl_state.check_password),
server_step(State#sasl_state{mech_mod = Module,
mech_state = MechState},
ClientIn);
_ ->
{error, "no-mechanism"}
end;
false ->
{error, "no-mechanism"}
end.
server_step(State, ClientIn) ->
Module = State#sasl_state.mech_mod,
MechState = State#sasl_state.mech_state,
case Module:mech_step(MechState, ClientIn) of
{ok, Props} ->
case check_credentials(State, Props) of
ok ->
{ok, Props};
{error, Error} ->
{error, Error}
end;
{continue, ServerOut, NewMechState} ->
{continue, ServerOut,
State#sasl_state{mech_state = NewMechState}};
{error, Error} ->
{error, Error}
end.
%% Remove the anonymous mechanism from the list if not enabled for the given
%% host
filter_anonymous(Host, Mechs) ->
case ejabberd_auth_anonymous:is_sasl_anonymous_enabled(Host) of
true -> Mechs;
false -> Mechs -- ["ANONYMOUS"]
end.
|
