source: protocols/jabber/iq.c @ 21167d2

/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Jabber module - IQ packets                                               *
*                                                                           *
*  Copyright 2006 Wilmer van der Gaast <wilmer@gaast.net>                   *
*                                                                           *
*  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.              *
*                                                                           *
\***************************************************************************/

#include "jabber.h"

/*
<iq xmlns="jabber:client" id="BeeX00000001" type="result"><query
xmlns="jabber:iq:auth"><username>wilmer</username><resource/><password/><digest/>
<sequence>499</sequence><token>450D1FFD</token></query></iq>
*/

xt_status jabber_pkt_iq( struct xt_node *node, gpointer data )
{
        struct gaim_connection *gc = data;
        struct jabber_data *jd = gc->proto_data;
        struct xt_node *query, *reply = NULL;
        char *s;
        int st;
        
        query = xt_find_node( node->children, "query" );
        
        if( !query )
                return XT_HANDLED;      /* Ignore it for now, don't know what's best... */
        
        if( ( s = xt_find_attr( query, "xmlns" ) ) && strcmp( s, "jabber:iq:auth" ) == 0 )
        {
                /* Time to authenticate ourselves! */
                reply = xt_new_node( "query", NULL, NULL );
                xt_add_attr( reply, "xmlns", "jabber:iq:auth" );
                xt_add_child( reply, xt_new_node( "username", jd->username, NULL ) );
                xt_add_child( reply, xt_new_node( "resource", set_getstr( &gc->acc->set, "resource" ), NULL ) );
                
                if( xt_find_node( query->children, "digest" ) && ( s = xt_find_attr( jd->xt->root, "id" ) ) )
                {
                        /* We can do digest authentication, it seems, and of
                           course we prefer that. */
                        SHA_CTX sha;
                        char hash_hex[40];
                        unsigned char hash[20];
                        int i;
                        
                        shaInit( &sha );
                        shaUpdate( &sha, (unsigned char*) s, strlen( s ) );
                        shaUpdate( &sha, (unsigned char*) gc->acc->pass, strlen( gc->acc->pass ) );
                        shaFinal( &sha, hash );
                        
                        for( i = 0; i < 20; i ++ )
                                sprintf( hash_hex + i * 2, "%02x", hash[i] );
                        
                        xt_add_child( reply, xt_new_node( "digest", hash_hex, NULL ) );
                }
                else if( xt_find_node( query->children, "password" ) )
                {
                        /* We'll have to stick with plaintext. Let's hope we're using SSL/TLS... */
                        xt_add_child( reply, xt_new_node( "password", gc->acc->pass, NULL ) );
                }
                else
                {
                        xt_free_node( reply );
                        
                        hide_login_progress_error( gc, "Can't find suitable authentication method" );
                        signoff( gc );
                        return XT_ABORT;
                }
                
                reply = jabber_make_packet( "iq", "set", NULL, reply );
                st = jabber_write_packet( gc, reply );
                xt_free_node( reply );
                
                return st ? XT_HANDLED : XT_ABORT;
        }
        
        return XT_HANDLED;
}

int jabber_start_auth( struct gaim_connection *gc )
{
        struct jabber_data *jd = gc->proto_data;
        struct xt_node *node;
        int st;
        
        node = xt_new_node( "query", NULL, xt_new_node( "username", jd->username, NULL ) );
        xt_add_attr( node, "xmlns", "jabber:iq:auth" );
        node = jabber_make_packet( "iq", "get", NULL, node );
        
        st = jabber_write_packet( gc, node );
        
        xt_free_node( node );
        return st;
}