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/***************************************************************************\
* *
* BitlBee - An IRC to IM gateway *
* Jabber module - SASL authentication *
* *
* 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"
#include "base64.h"
#define SASL_NS "urn:ietf:params:xml:ns:xmpp-sasl"
xt_status sasl_pkt_mechanisms( struct xt_node *node, gpointer data )
{
struct gaim_connection *gc = data;
struct jabber_data *jd = gc->proto_data;
struct xt_node *c, *reply;
char *s;
int sup_plain = 0, sup_digest = 0;
if( !sasl_supported( gc ) )
{
/* Should abort this now, since we should already be doing
IQ authentication. Strange things happen when you try
to do both... */
serv_got_crap( gc, "XMPP 1.0 non-compliant server seems to support SASL, please report this as a BitlBee bug!" );
return XT_HANDLED;
}
s = xt_find_attr( node, "xmlns" );
if( !s || strcmp( s, SASL_NS ) != 0 )
{
signoff( gc );
return XT_ABORT;
}
c = node->children;
while( ( c = xt_find_node( c, "mechanism" ) ) )
{
if( c->text && g_strcasecmp( c->text, "PLAIN" ) == 0 )
sup_plain = 1;
if( c->text && g_strcasecmp( c->text, "DIGEST-MD5" ) == 0 )
sup_digest = 1;
c = c->next;
}
if( !sup_plain && !sup_digest )
{
signoff( gc );
return XT_ABORT;
}
reply = xt_new_node( "auth", NULL, NULL );
xt_add_attr( reply, "xmlns", SASL_NS );
if( sup_digest && 0 )
{
xt_add_attr( reply, "mechanism", "DIGEST-MD5" );
/* The rest will be done later, when we receive a <challenge/>. */
}
else if( sup_plain )
{
int len;
xt_add_attr( reply, "mechanism", "PLAIN" );
/* With SASL PLAIN in XMPP, the text should be b64(\0user\0pass) */
len = strlen( jd->username ) + strlen( gc->acc->pass ) + 2;
s = g_malloc( len + 1 );
s[0] = 0;
strcpy( s + 1, jd->username );
strcpy( s + 2 + strlen( jd->username ), gc->acc->pass );
reply->text = base64_encode( s, len );
reply->text_len = strlen( reply->text );
g_free( s );
}
if( !jabber_write_packet( gc, reply ) )
{
xt_free_node( reply );
return XT_ABORT;
}
xt_free_node( reply );
/* To prevent classic authentication from happening. */
jd->flags |= JFLAG_STREAM_STARTED;
return XT_HANDLED;
}
xt_status sasl_pkt_challenge( struct xt_node *node, gpointer data )
{
return XT_HANDLED;
}
xt_status sasl_pkt_result( struct xt_node *node, gpointer data )
{
struct gaim_connection *gc = data;
struct jabber_data *jd = gc->proto_data;
char *s;
s = xt_find_attr( node, "xmlns" );
if( !s || strcmp( s, SASL_NS ) != 0 )
{
signoff( gc );
return XT_ABORT;
}
if( strcmp( node->name, "success" ) == 0 )
{
set_login_progress( gc, 1, "Authentication finished" );
jd->flags |= JFLAG_AUTHENTICATED | JFLAG_STREAM_RESTART;
}
else if( strcmp( node->name, "failure" ) == 0 )
{
hide_login_progress( gc, "Authentication failure" );
signoff( gc );
return XT_ABORT;
}
return XT_HANDLED;
}
/* This one is needed to judge if we'll do authentication using IQ or SASL.
It's done by checking if the <stream:stream> from the server has a
version attribute. I don't know if this is the right way though... */
gboolean sasl_supported( struct gaim_connection *gc )
{
struct jabber_data *jd = gc->proto_data;
return ( (void*) ( jd->xt && jd->xt->root && xt_find_attr( jd->xt->root, "version" ) ) ) != NULL;
}
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