source: protocols/msn/passport.c @ ca0981a

/** passport.c
 *
 * Functions to login to Microsoft Passport service for Messenger
 * Copyright (C) 2004-2008 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 version 2                   
 * as published by the Free Software Foundation                                     
 *                                                                                   
 * This program is distributed in the hope that is will be useful,                  
 * bit WITHOU 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA          
 *
 */

#include "http_client.h"
#include "passport.h"
#include "msn.h"
#include "bitlbee.h"
#include "url.h"
#include "misc.h"
#include "xmltree.h"
#include <ctype.h>
#include <errno.h>

static int passport_get_token_real( struct msn_auth_data *mad );
static void passport_get_token_ready( struct http_request *req );

int passport_get_token( gpointer func, gpointer data, char *username, char *password, char *cookie )
{
        struct msn_auth_data *mad = g_new0( struct msn_auth_data, 1 );
        int i;
        
        mad->username = g_strdup( username );
        mad->password = g_strdup( password );
        mad->cookie = g_strdup( cookie );
        
        mad->callback = func;
        mad->data = data;
        
        mad->url = g_strdup( SOAP_AUTHENTICATION_URL );
        mad->ttl = 3; /* Max. # of redirects. */
        
        /* HTTP-escape stuff and s/,/&/ */
        http_decode( mad->cookie );
        for( i = 0; mad->cookie[i]; i ++ )
                if( mad->cookie[i] == ',' )
                        mad->cookie[i] = '&';
        
        /* Microsoft doesn't allow password longer than 16 chars and silently
           fails authentication if you give the "full version" of your passwd. */
        if( strlen( mad->password ) > MAX_PASSPORT_PWLEN )
                mad->password[MAX_PASSPORT_PWLEN] = 0;
        
        return passport_get_token_real( mad );
}

static int passport_get_token_real( struct msn_auth_data *mad )
{
        char *post_payload, *post_request;
        struct http_request *req;
        url_t url;
        
        url_set( &url, mad->url );
        
        post_payload = g_markup_printf_escaped( SOAP_AUTHENTICATION_PAYLOAD,
                                                mad->username,
                                                mad->password,
                                                mad->cookie );
        
        post_request = g_strdup_printf( SOAP_AUTHENTICATION_REQUEST,
                                        url.file, url.host,
                                        (int) strlen( post_payload ),
                                        post_payload );
                                        
        req = http_dorequest( url.host, url.port, 1, post_request,
                              passport_get_token_ready, mad );
        
        g_free( post_request );
        g_free( post_payload );
        
        return req != NULL;
}

static xt_status passport_xt_extract_token( struct xt_node *node, gpointer data );
static xt_status passport_xt_handle_fault( struct xt_node *node, gpointer data );

static const struct xt_handler_entry passport_xt_handlers[] = {
        { "wsse:BinarySecurityToken", "wst:RequestedSecurityToken", passport_xt_extract_token },
        { "S:Fault",                  "S:Envelope",                 passport_xt_handle_fault  },
        { NULL,                       NULL,                         NULL                      }
};

static void passport_get_token_ready( struct http_request *req )
{
        struct msn_auth_data *mad = req->data;
        struct xt_parser *parser;
        
        g_free( mad->url );
        g_free( mad->error );
        mad->url = mad->error = NULL;
        
        if( req->status_code == 200 )
        {
                parser = xt_new( passport_xt_handlers, mad );
                xt_feed( parser, req->reply_body, req->body_size );
                xt_handle( parser, NULL, -1 );
                xt_free( parser );
        }
        else
        {
                mad->error = g_strdup_printf( "HTTP error %d (%s)", req->status_code,
                                              req->status_string ? req->status_string : "unknown" );
        }
        
        if( mad->error == NULL && mad->token == NULL )
                mad->error = g_strdup( "Could not parse Passport server response" );
        
        if( mad->url && mad->token == NULL )
        {
                passport_get_token_real( mad );
        }
        else
        {
                mad->callback( mad );
                
                g_free( mad->url );
                g_free( mad->username );
                g_free( mad->password );
                g_free( mad->cookie );
                g_free( mad->token );
                g_free( mad->error );
                g_free( mad );
        }
}

static xt_status passport_xt_extract_token( struct xt_node *node, gpointer data )
{
        struct msn_auth_data *mad = data;
        char *s;
        
        if( ( s = xt_find_attr( node, "Id" ) ) && strcmp( s, "PPToken1" ) == 0 )
                mad->token = g_memdup( node->text, node->text_len + 1 );
        
        return XT_HANDLED;
}

static xt_status passport_xt_handle_fault( struct xt_node *node, gpointer data )
{
        struct msn_auth_data *mad = data;
        struct xt_node *code = xt_find_node( node->children, "faultcode" );
        struct xt_node *string = xt_find_node( node->children, "faultstring" );
        struct xt_node *redirect = xt_find_node( node->children, "psf:redirectUrl" );
        
        if( redirect && redirect->text_len && mad->ttl-- > 0 )
                mad->url = g_memdup( redirect->text, redirect->text_len + 1 );
        
        if( code == NULL || code->text_len == 0 )
                mad->error = g_strdup( "Unknown error" );
        else
                mad->error = g_strdup_printf( "%s (%s)", code->text, string && string->text_len ?
                                              string->text : "no description available" );
        
        return XT_HANDLED;
}