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DEFINITIONS
This source file includes following definitions.
- php_checkuid_ex
- php_checkuid
- php_get_current_user
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2008 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Rasmus Lerdorf <rasmus@lerdorf.on.ca> |
+----------------------------------------------------------------------+
*/
/* $Id: safe_mode.c,v 1.62.2.1.2.15 2007/12/31 07:20:15 sebastian Exp $ */
#include "php.h"
#include <stdio.h>
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include "ext/standard/pageinfo.h"
#include "safe_mode.h"
#include "SAPI.h"
#include "php_globals.h"
/*
* php_checkuid
*
* This function has six 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)
* 4 - check mode and param
* 5 - only check file
*/
PHPAPI int php_checkuid_ex(const char *filename, const char *fopen_mode, int mode, int flags)
{
struct stat sb;
int ret, nofile=0;
long uid=0L, gid=0L, duid=0L, dgid=0L;
char path[MAXPATHLEN];
char *s, filenamecopy[MAXPATHLEN];
php_stream_wrapper *wrapper = NULL;
TSRMLS_FETCH();
path[0] = '\0';
if (!filename) {
return 0; /* path must be provided */
}
if (strlcpy(filenamecopy, filename, MAXPATHLEN)>=MAXPATHLEN) {
return 0;
}
filename=(char *)&filenamecopy;
if (fopen_mode) {
if (fopen_mode[0] == 'r') {
mode = CHECKUID_DISALLOW_FILE_NOT_EXISTS;
} else {
mode = CHECKUID_CHECK_FILE_AND_DIR;
}
}
/*
* If given filepath is a URL, allow - safe mode stuff
* related to URL's is checked in individual functions
*/
wrapper = php_stream_locate_url_wrapper(filename, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC);
if (wrapper != NULL)
return 1;
/* First we see if the file is owned by the same user...
* If that fails, passthrough and check directory...
*/
if (mode != CHECKUID_ALLOW_ONLY_DIR) {
#if HAVE_BROKEN_GETCWD
char ftest[MAXPATHLEN];
strcpy(ftest, filename);
if (VCWD_GETCWD(ftest, sizeof(ftest)) == NULL) {
strcpy(path, filename);
} else
#endif
expand_filepath(filename, path TSRMLS_CC);
ret = VCWD_STAT(path, &sb);
if (ret < 0) {
if (mode == CHECKUID_DISALLOW_FILE_NOT_EXISTS) {
if ((flags & CHECKUID_NO_ERRORS) == 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to access %s", filename);
}
return 0;
} else if (mode == CHECKUID_ALLOW_FILE_NOT_EXISTS) {
if ((flags & CHECKUID_NO_ERRORS) == 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to access %s", filename);
}
return 1;
}
nofile = 1;
} else {
uid = sb.st_uid;
gid = sb.st_gid;
if (uid == php_getuid()) {
return 1;
} else if (PG(safe_mode_gid) && gid == php_getgid()) {
return 1;
}
}
/* Trim off filename */
if ((s = strrchr(path, DEFAULT_SLASH))) {
if (*(s + 1) == '\0' && s != path) { /* make sure that the / is not the last character */
*s = '\0';
s = strrchr(path, DEFAULT_SLASH);
}
if (s) {
if (s == path) {
path[1] = '\0';
} else {
*s = '\0';
}
}
}
} else { /* CHECKUID_ALLOW_ONLY_DIR */
s = strrchr(filename, DEFAULT_SLASH);
if (s == filename) {
/* root dir */
path[0] = DEFAULT_SLASH;
path[1] = '\0';
} else if (s && *(s + 1) != '\0') { /* make sure that the / is not the last character */
*s = '\0';
VCWD_REALPATH(filename, path);
*s = DEFAULT_SLASH;
} else {
/* Under Solaris, getcwd() can fail if there are no
* read permissions on a component of the path, even
* though it has the required x permissions */
path[0] = '.';
path[1] = '\0';
VCWD_GETCWD(path, sizeof(path));
}
} /* end CHECKUID_ALLOW_ONLY_DIR */
if (mode != CHECKUID_ALLOW_ONLY_FILE) {
/* check directory */
ret = VCWD_STAT(path, &sb);
if (ret < 0) {
if ((flags & CHECKUID_NO_ERRORS) == 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to access %s", filename);
}
return 0;
}
duid = sb.st_uid;
dgid = sb.st_gid;
if (duid == php_getuid()) {
return 1;
} else if (PG(safe_mode_gid) && dgid == php_getgid()) {
return 1;
} else {
if (SG(rfc1867_uploaded_files)) {
if (zend_hash_exists(SG(rfc1867_uploaded_files), (char *) filename, strlen(filename)+1)) {
return 1;
}
}
}
}
if (mode == CHECKUID_ALLOW_ONLY_DIR) {
uid = duid;
gid = dgid;
if (s) {
*s = 0;
}
}
if (nofile) {
uid = duid;
gid = dgid;
filename = path;
}
if ((flags & CHECKUID_NO_ERRORS) == 0) {
if (PG(safe_mode_gid)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "SAFE MODE Restriction in effect. The script whose uid/gid is %ld/%ld is not allowed to access %s owned by uid/gid %ld/%ld", php_getuid(), php_getgid(), filename, uid, gid);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "SAFE MODE Restriction in effect. The script whose uid is %ld is not allowed to access %s owned by uid %ld", php_getuid(), filename, uid);
}
}
return 0;
}
PHPAPI int php_checkuid(const char *filename, const char *fopen_mode, int mode)
{
#ifdef NETWARE
/* NetWare don't have uid*/
return 1;
#else
return php_checkuid_ex(filename, fopen_mode, mode, 0);
#endif
}
PHPAPI char *php_get_current_user(void)
{
struct stat *pstat;
TSRMLS_FETCH();
if (SG(request_info).current_user) {
return SG(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 */
pstat = sapi_get_stat(TSRMLS_C);
if (!pstat) {
return "";
} else {
#ifdef PHP_WIN32
char name[256];
DWORD len = sizeof(name)-1;
if (!GetUserName(name, &len)) {
return "";
}
name[len] = '\0';
SG(request_info).current_user_length = len;
SG(request_info).current_user = estrndup(name, len);
return SG(request_info).current_user;
#else
struct passwd *pwd;
#if defined(ZTS) && defined(HAVE_GETPWUID_R) && defined(_SC_GETPW_R_SIZE_MAX)
struct passwd _pw;
struct passwd *retpwptr = NULL;
int pwbuflen = sysconf(_SC_GETPW_R_SIZE_MAX);
char *pwbuf;
if (pwbuflen < 1) {
return "";
}
pwbuf = emalloc(pwbuflen);
if (getpwuid_r(pstat->st_uid, &_pw, pwbuf, pwbuflen, &retpwptr) != 0) {
efree(pwbuf);
return "";
}
pwd = &_pw;
#else
if ((pwd=getpwuid(pstat->st_uid))==NULL) {
return "";
}
#endif
SG(request_info).current_user_length = strlen(pwd->pw_name);
SG(request_info).current_user = estrndup(pwd->pw_name, SG(request_info).current_user_length);
#if defined(ZTS) && defined(HAVE_GETPWUID_R) && defined(_SC_GETPW_R_SIZE_MAX)
efree(pwbuf);
#endif
return SG(request_info).current_user;
#endif
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/