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396 | ------------------------------------------------------------------------------
-- --
-- AXMPP Project --
-- --
-- XMPP Library for Ada --
-- --
------------------------------------------------------------------------------
-- --
-- Copyright © 2011-2016, Alexander Basov <coopht@gmail.com> --
-- All rights reserved. --
-- --
-- Redistribution and use in source and binary forms, with or without --
-- modification, are permitted provided that the following conditions --
-- are met: --
-- --
-- * Redistributions of source code must retain the above copyright --
-- notice, this list of conditions and the following disclaimer. --
-- --
-- * Redistributions in binary form must reproduce the above copyright --
-- notice, this list of conditions and the following disclaimer in the --
-- documentation and/or other materials provided with the distribution. --
-- --
-- * Neither the name of the Alexander Basov, IE nor the names of its --
-- contributors may be used to endorse or promote products derived from --
-- this software without specific prior written permission. --
-- --
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS --
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT --
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR --
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT --
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, --
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED --
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR --
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF --
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING --
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS --
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --
-- --
------------------------------------------------------------------------------
-- $Revision$ $Date$
------------------------------------------------------------------------------
with Ada.Characters.Conversions;
with Ada.Streams;
with GNAT.MD5;
with League.String_Vectors;
with XMPP.Base64;
with XMPP.Logger;
with XMPP.Utils;
package body XMPP.Challenges is
use type Ada.Streams.Stream_Element_Offset;
use League.Strings;
package ACC renames Ada.Characters.Conversions;
function Create return XMPP_Challenge_Access is
begin
return new XMPP_Challenge;
end Create;
-------------------------
-- Generate_Response --
-------------------------
function Generate_Response (Self : XMPP_Challenge)
return League.Strings.Universal_String is
function Hex_To_Oct (Sum : String) return String;
------------------
-- Hex_To_Oct --
------------------
function Hex_To_Oct (Sum : String) return String is
Result : String (Sum'First .. Sum'Last / 2);
J : Integer := Sum'First;
begin
for Idx in Result'Range loop
Result (Idx)
:= Character'Val
(Integer'Value (("16#" & Sum (J .. J + 1) & "#")));
J := J + 2;
end loop;
return Result;
end Hex_To_Oct;
begin
if not Self.RSP_Auth.Is_Empty then
return League.Strings.To_Universal_String
("<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>");
else
declare
-- TODO:
-- CNonce should not be hardcoded.
C_Nonce : constant Wide_Wide_String
:= "1a2f0ee81279451956625d2368";
SY : constant String
:= Hex_To_Oct (GNAT.MD5.Digest
(ACC.To_String
(Self.JID.To_Wide_Wide_String & ":"
& Self.Host.To_Wide_Wide_String & ":"
& Self.Password.To_Wide_Wide_String)));
HA1 : constant String
:= GNAT.MD5.Digest
(SY & ":"
& ACC.To_String (Self.Nonce.To_Wide_Wide_String)
& ":" & ACC.To_String (C_Nonce));
HA2 : constant String
:= GNAT.MD5.Digest
(ACC.To_String ("AUTHENTICATE:xmpp/"
& Self.Host.To_Wide_Wide_String));
Z : constant String
:= GNAT.MD5.Digest
(HA1 & ":"
& ACC.To_String (Self.Nonce.To_Wide_Wide_String)
& ":00000001:"
& ACC.To_String (C_Nonce) & ":auth:"
& HA2);
Realm_Reply : constant Wide_Wide_String
:= "username=""" & Self.JID.To_Wide_Wide_String
& """,realm=""" & Self.Host.To_Wide_Wide_String
& """,nonce=""" & Self.Nonce.To_Wide_Wide_String
& """,cnonce=""" & C_Nonce
& """,nc=00000001"
& ",qop=auth,digest-uri=""xmpp/" & Self.Host.To_Wide_Wide_String
& """,response=" & ACC.To_Wide_Wide_String (Z)
& ",charset="
& Self.Charset.To_Wide_Wide_String;
-- Calculating buffer size for base64 encoded string
X : constant Integer := 4 * (Realm_Reply'Length + 2) / 3;
Y : constant Integer := X + 2 * (X / 76);
Realm_Reply_Base_64 : String (Realm_Reply'First .. Y);
Len : Natural;
begin
-- XMPP.Logger.Log ("SY:" & SY);
-- XMPP.Logger.Log ("HA1:" & HA1);
-- XMPP.Logger.Log ("HA2:" & HA2);
-- XMPP.Logger.Log ("Z:" & Z);
-- XMPP.Logger.Log ("Realm_Reply:" & ACC.To_String (Realm_Reply));
XMPP.Base64.Encode
(XMPP.Utils.To_Stream_Element_Array
(ACC.To_String (Realm_Reply)),
Realm_Reply_Base_64,
Len);
-- XMPP.Logger.Log ("Realm_Reply_Base_64:" & Realm_Reply_Base_64);
return
League.Strings.To_Universal_String
("<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>"
& ACC.To_Wide_Wide_String
(Realm_Reply_Base_64 (Realm_Reply_Base_64'First .. Len))
& "</response>");
end;
end if;
end Generate_Response;
----------------
-- Get_Kind --
----------------
overriding
function Get_Kind (Self : XMPP_Challenge) return XMPP.Object_Kind is
pragma Unreferenced (Self);
begin
return XMPP.Challenge;
end Get_Kind;
-----------------------
-- Parse_Challenge --
-----------------------
procedure Parse_Challenge (Self : in out XMPP_Challenge;
Challenge : String) is
function Drop_Quotes (Str : String) return String;
-------------------
-- Drop_Quotes --
-------------------
function Drop_Quotes (Str : String) return String is
begin
if Str (Str'First) = '"' and Str (Str'Last) = '"' then
return Str (Str'First + 1 .. Str'Last - 1);
else
return Str;
end if;
end Drop_Quotes;
Pos : Integer := Challenge'First;
begin
if Challenge (Challenge'First .. Challenge'First + 6) = "rspauth" then
Self.Set_RSP_Auth
(League.Strings.To_Universal_String
(ACC.To_Wide_Wide_String
(Challenge (Challenge'First + 8 .. Challenge'Last))));
return;
end if;
for J in Challenge'Range loop
if Challenge (J) = ',' then
declare
T : constant String := Challenge (Pos .. J - 1);
begin
for X in T'Range loop
if T (X) = '=' then
declare
Param : constant String := T (T'First .. X - 1);
Val : constant String := T (X + 1 .. T'Last);
begin
if Param = "nonce" then
Self.Set_Nonce
(League.Strings.To_Universal_String
(ACC.To_Wide_Wide_String (Drop_Quotes (Val))));
elsif Param = "qop" then
Self.Set_Qop
(League.Strings.To_Universal_String
(ACC.To_Wide_Wide_String (Drop_Quotes (Val))));
elsif Param = "charset" then
Self.Set_Charset
(League.Strings.To_Universal_String
(ACC.To_Wide_Wide_String (Drop_Quotes (Val))));
elsif Param = "algorithm" then
Self.Set_Algorithm
(League.Strings.To_Universal_String
(ACC.To_Wide_Wide_String (Drop_Quotes (Val))));
else
XMPP.Logger.Log
("unknown parameter : "
& ACC.To_Wide_Wide_String (Param));
end if;
end;
end if;
end loop;
end;
Pos := J + 1;
end if;
end loop;
end Parse_Challenge;
-----------------
-- Serialize --
-----------------
overriding procedure Serialize
(Self : XMPP_Challenge;
Writer : in out XML.SAX.Pretty_Writers.XML_Pretty_Writer'Class) is
pragma Unreferenced (Self);
pragma Unreferenced (Writer);
begin
raise Program_Error with "Not yet implemented";
end Serialize;
---------------------
-- Set_Algorithm --
---------------------
procedure Set_Algorithm (Self : in out XMPP_Challenge;
Algorithm : League.Strings.Universal_String) is
begin
Self.Algorithm := Algorithm;
end Set_Algorithm;
-------------------
-- Set_Charset --
-------------------
procedure Set_Charset (Self : in out XMPP_Challenge;
Charset : League.Strings.Universal_String) is
begin
Self.Charset := Charset;
end Set_Charset;
-------------------
-- Set_Content --
-------------------
overriding
procedure Set_Content (Self : in out XMPP_Challenge;
Parameter : League.Strings.Universal_String;
Value : League.Strings.Universal_String) is
begin
if Parameter.To_Wide_Wide_String = "challenge" then
declare
Buffer : Ada.Streams.Stream_Element_Array (0 .. 4096);
Length : Ada.Streams.Stream_Element_Offset;
begin
XMPP.Base64.Decode
(Ada.Characters.Conversions.To_String
(Value.To_Wide_Wide_String),
Buffer,
Length);
declare
Result : String (1 .. Integer (Length));
begin
for J in 1 .. Length loop
Result (Integer (J)) := (Character'Val (Buffer (J - 1)));
end loop;
-- XMPP.Logger.Log ("Decoded challenge: " & Result);
Self.Parse_Challenge (Result);
end;
end;
else
XMPP.Logger.Log ("Unknown parameter : " & Parameter);
end if;
end Set_Content;
---------------
-- Set_JID --
---------------
procedure Set_JID (Self : in out XMPP_Challenge;
JID : League.Strings.Universal_String) is
Vec : constant League.String_Vectors.Universal_String_Vector
:= JID.Split ('@');
begin
if Vec.Length /= 2 then
raise Program_Error with "Wrong jid specfified";
else
Self.JID := Vec.Element (1);
Self.Host := Vec.Element (2);
end if;
end Set_JID;
-----------------
-- Set_Nonce --
-----------------
procedure Set_Nonce (Self : in out XMPP_Challenge;
Nonce : League.Strings.Universal_String) is
begin
Self.Nonce := Nonce;
end Set_Nonce;
--------------------
-- Set_Password --
--------------------
procedure Set_Password (Self : in out XMPP_Challenge;
Password : League.Strings.Universal_String) is
begin
Self.Password := Password;
end Set_Password;
---------------
-- Set_Qop --
---------------
procedure Set_Qop (Self : in out XMPP_Challenge;
Qop : League.Strings.Universal_String) is
begin
Self.Qop := Qop;
end Set_Qop;
-----------------
-- Set_Realm --
-----------------
procedure Set_Realm (Self : in out XMPP_Challenge;
Realm : League.Strings.Universal_String) is
begin
Self.Realm := Realm;
end Set_Realm;
--------------------
-- Set_RSP_Auth --
--------------------
procedure Set_RSP_Auth (Self : in out XMPP_Challenge;
RSP_Auth : League.Strings.Universal_String) is
begin
Self.RSP_Auth := RSP_Auth;
end Set_RSP_Auth;
end XMPP.Challenges;
|