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|
/*
+----------------------------------------------------------------------+
| PHP HTML Embedded Scripting Language Version 3.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2000 PHP Development Team (See Credits file) |
+----------------------------------------------------------------------+
| This program is free software; you can redistribute it and/or modify |
| it under the terms of one of the following licenses: |
| |
| A) 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. |
| |
| B) the PHP License as published by the PHP Development Team and |
| included in the distribution in the file: LICENSE |
| |
| 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 both licenses referred to here. |
| If you did not, or have any questions about PHP licensing, please |
| contact core@php.net. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <rasmus@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id: safe_mode.c,v 1.31 2000/01/08 14:34:17 rasmus Exp $ */
#include "php.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/stat.h>
#include "functions/pageinfo.h"
#include "safe_mode.h"
/*
* _php3_checkuid
*
* This function has four modes:
*
* 0 - return invalid (0) if file does not exist
* 1 - return valid (1) if file does not exist
* 2 - if file does not exist, check directory
* 3 - only check directory (needed for mkdir)
*/
PHPAPI int _php3_checkuid(const char *fn, int mode) {
struct stat sb;
int ret;
long uid=0L, duid=0L;
char *s;
if (!fn) return(0); /* path must be provided */
/*
* If given filepath is a URL, allow - safe mode stuff
* related to URL's is checked in individual functions
*/
if (!strncasecmp(fn,"http://",7) || !strncasecmp(fn,"ftp://",6)) {
return(1);
}
if (mode<3) {
ret = stat(fn,&sb);
if (ret<0 && mode < 2) {
php3_error(E_WARNING,"Unable to access %s",fn);
return(mode);
}
if (ret>-1) {
uid=sb.st_uid;
if (uid==_php3_getuid()) return(1);
}
}
s = strrchr(fn,'/');
/* This loop gets rid of trailing slashes which could otherwise be
* used to confuse the function.
*/
while(s && *(s+1)=='\0' && s>fn) {
*s='\0';
s = strrchr(fn,'/');
}
if (s) {
*s='\0';
ret = stat(fn,&sb);
*s='/';
if (ret<0) {
php3_error(E_WARNING, "Unable to access %s",fn);
return(0);
}
duid = sb.st_uid;
} else {
s = emalloc(MAXPATHLEN+1);
if (!getcwd(s,MAXPATHLEN)) {
php3_error(E_WARNING, "Unable to access current working directory");
return(0);
}
ret = stat(s,&sb);
efree(s);
if (ret<0) {
php3_error(E_WARNING, "Unable to access %s",s);
return(0);
}
duid = sb.st_uid;
}
if (duid == (uid=_php3_getuid())) return(1);
else {
php3_error(E_WARNING, "SAFE MODE Restriction in effect. The script whose uid is %ld is not allowed to access %s owned by uid %ld",uid,fn,duid);
return(0);
}
}
PHPAPI char *_php3_get_current_user()
{
#if CGI_BINARY || USE_SAPI || FHTTPD
struct stat statbuf;
#endif
struct passwd *pwd;
int uid;
TLS_VARS;
if (GLOBAL(request_info).current_user) {
return GLOBAL(request_info).current_user;
}
/* FIXME: I need to have this somehow handled if
USE_SAPI is defined, because cgi will also be
interfaced in USE_SAPI */
#if CGI_BINARY || USE_SAPI || FHTTPD
if (!GLOBAL(request_info).filename || (stat(GLOBAL(request_info).filename,&statbuf)==-1)) {
return empty_string;
}
uid = statbuf.st_uid;
#endif
#if APACHE
uid = GLOBAL(php3_rqst)->finfo.st_uid;
#endif
if ((pwd=getpwuid(uid))==NULL) {
return empty_string;
}
GLOBAL(request_info).current_user_length = strlen(pwd->pw_name);
GLOBAL(request_info).current_user = estrndup(pwd->pw_name,GLOBAL(request_info).current_user_length);
return GLOBAL(request_info).current_user;
}
|
