restrict.c

wu-ftpd类unix下的ftp服务器,可用于嵌入式系统

/****************************************************************************    
  Copyright (c) 1999,2000 WU-FTPD Development Group.  
  All rights reserved.
   
  Portions Copyright (c) 1980, 1985, 1988, 1989, 1990, 1991, 1993, 1994  
    The Regents of the University of California. 
  Portions Copyright (c) 1993, 1994 Washington University in Saint Louis.  
  Portions Copyright (c) 1996, 1998 Berkeley Software Design, Inc.  
  Portions Copyright (c) 1989 Massachusetts Institute of Technology.  
  Portions Copyright (c) 1998 Sendmail, Inc.  
  Portions Copyright (c) 1983, 1995, 1996, 1997 Eric P.  Allman.  
  Portions Copyright (c) 1997 by Stan Barber.  
  Portions Copyright (c) 1997 by Kent Landfield.  
  Portions Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997  
    Free Software Foundation, Inc.    
   
  Use and distribution of this software and its source code are governed   
  by the terms and conditions of the WU-FTPD Software License ("LICENSE").  
   
  If you did not receive a copy of the license, it may be obtained online  
  at http://www.wu-ftpd.org/license.html.  
   
  $Id: restrict.c,v 1.14 2000/07/01 18:17:39 wuftpd Exp $  
   
****************************************************************************/
/*
 * Contributed by Glenn Nielsen <[e-mail]>
 * Mon, 18 Jan 1999 20:04:07 -0600
 */
#include "config.h"

#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "proto.h"

#ifdef HAVE_GETCWD
extern char *getcwd(char *, size_t);
#else
extern char *getwd(char *);
#endif

#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif

extern char *home;
extern int restricted_user;

/*
 * name is the function parameter
 * home is a global string containing the user's home directory
 *
 * rhome is the resolved home directory
 * rname is the resolved requested filename
 * curwd is the current working directory
 * path is name, possibly prepended by the current working directory
 */

int restrict_check(char *name)
{
    if (!test_restriction(name))
	return 0;
    reply(550, "Permission denied on server.  You are restricted to your account.");
    return 1;
}

int test_restriction(char *name)
{
    char rhome[MAXPATHLEN + 1], rname[MAXPATHLEN + 1], path[MAXPATHLEN + 1];

    /* we're not in restrict mode so all access is OK */
    if (restricted_user == FALSE)
	return 0;

    /* get resolved equivalent of user's home directory */
    fb_realpath(home, rhome);

    path[0] = '\0';

    /* a relative path is specified, so resolve it w.r.t. current working directory */
    if ((name)[0] != '/') {

	char curwd[MAXPATHLEN + 1];

	/* determine current working directory */
#ifdef HAVE_GETCWD
	if (getcwd(curwd, MAXPATHLEN) == (char *) NULL) {
#else
	if (getwd(curwd) == (char *) NULL) {
#endif
	    return 1;
	}			/* if */

	strcpy(path, curwd);
	strcat(path, "/");

    }				/* if */

    if ((strlen(path) + strlen(name) + 2) > sizeof(path)) {
	return 1;
    }

    strcat(path, name);
    fb_realpath(path, rname);
    strcat(rname, "/");

    if (strncmp(rhome, rname, strlen(rhome))) {
	return 1;
    }				/* if */

    return 0;
}				/* restrict_check */

int restrict_list_check(char *name)
{
    char *beg, *copy, *end;
    int flag;

    beg = name;

    while (*beg != '\0') {

	flag = 0;
	end = beg;
	while (*end && !isspace(*end))
	    ++end;
	if (!*end)
	    flag = 1;
	if (!flag)
	    *end = '\0';
	copy = strdup(beg);
	if (!flag)
	    *end = ' ';

	if (!copy) {
	    reply(550, "Permission denied on server.  Out of memory.");
	    return 1;

	}			/* if */

	if (restrict_check(copy)) {
	    free(copy);
	    return 1;
	}
	free(copy);
	beg = end;
	if (!flag)
	    ++beg;

    }				/* while */

    return 0;

}				/* restrict_list_check */

/*
 * $Log: restrict.c,v $
 * Revision 1.14  2000/07/01 18:17:39  wuftpd
 *
 * Updated copyright statement for the WU-FTPD Development Group.
 *
 * Revision 1.13  1999/10/08 03:42:12  wuftpd
 * Fixed a bug in restrict_check which could allow access outside the users home
 *
 * Revision 1.12  1999/09/05 02:31:50  wuftpd
 * Add virtual and defaultserver support for email notification
 *
 * Revision 1.11  1999/09/02 19:35:48  wuftpd
 * CDUP was leaking information about restrictions.
 *
 * Revision 1.10  1999/09/02 14:04:29  wuftpd
 * Cleaning up.  Indented and removed some STDC checks
 *
 * Revision 1.9  1999/08/24 23:41:39  wuftpd
 * wu-ftpd-2.4.x RCS Ids removed and new Ids added for wu-ftpd.org usage.
 * WU-FTPD Development Group copyright headers added.
 * Original Copyright headers moved into the COPYRIGHT file.
 * COPYPRIGHT.c added to build for ftpshut and ftpd.
 *
 * Revision 1.2  1996/02/20 04:54:04  root
 * added #define to make gcc use HAVE_GETCWD
 *
 * Revision 1.1  1996/02/20 03:52:48  root
 * Initial revision
 *
 */