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php-src/main/fopen_wrappers.c

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/*
+----------------------------------------------------------------------+
| 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. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <rasmus@lerdorf.on.ca> |
| Jim Winstead <jimw@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/* {{{ includes
*/
#include "php.h"
#include "php_globals.h"
#include "SAPI.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef PHP_WIN32
#define O_RDONLY _O_RDONLY
#include "win32/param.h"
#else
#include <sys/param.h>
#endif
#include "safe_mode.h"
#include "ext/standard/head.h"
#include "ext/standard/php_standard.h"
#include "zend_compile.h"
#include "php_network.h"
#if HAVE_PWD_H
#include <pwd.h>
#endif
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
#ifdef PHP_WIN32
#include <winsock2.h>
#elif defined(NETWARE) && defined(USE_WINSOCK)
#include <novsock2.h>
#else
#include <netinet/in.h>
#include <netdb.h>
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#endif
#if defined(PHP_WIN32) || defined(__riscos__) || defined(NETWARE)
#undef AF_UNIX
#endif
#if defined(AF_UNIX)
#include <sys/un.h>
#endif
/* }}} */
/* {{{ php_check_specific_open_basedir
When open_basedir is not NULL, check if the given filename is located in
open_basedir. Returns -1 if error or not in the open_basedir, else 0.
When open_basedir is NULL, always return 0.
*/
PHPAPI int php_check_specific_open_basedir(const char *basedir, const char *path TSRMLS_DC)
{
char resolved_name[MAXPATHLEN];
char resolved_basedir[MAXPATHLEN];
char local_open_basedir[MAXPATHLEN];
char path_tmp[MAXPATHLEN];
char *path_file;
int resolved_basedir_len;
int resolved_name_len;
int path_len;
int nesting_level = 0;
/* Special case basedir==".": Use script-directory */
if (strcmp(basedir, ".") || !VCWD_GETCWD(local_open_basedir, MAXPATHLEN)) {
/* Else use the unmodified path */
strlcpy(local_open_basedir, basedir, sizeof(local_open_basedir));
}
path_len = strlen(path);
if (path_len > (MAXPATHLEN - 1)) {
/* empty and too long paths are invalid */
return -1;
}
/* normalize and expand path */
if (expand_filepath(path, resolved_name TSRMLS_CC) == NULL) {
return -1;
}
path_len = strlen(resolved_name);
memcpy(path_tmp, resolved_name, path_len + 1); /* safe */
while (VCWD_REALPATH(path_tmp, resolved_name) == NULL) {
#ifdef HAVE_SYMLINK
if (nesting_level == 0) {
int ret;
char buf[MAXPATHLEN];
ret = readlink(path_tmp, buf, MAXPATHLEN - 1);
if (ret < 0) {
/* not a broken symlink, move along.. */
} else {
/* put the real path into the path buffer */
memcpy(path_tmp, buf, ret);
path_tmp[ret] = '\0';
}
}
#endif
#if defined(PHP_WIN32) || defined(NETWARE)
path_file = strrchr(path_tmp, DEFAULT_SLASH);
if (!path_file) {
path_file = strrchr(path_tmp, '/');
}
#else
path_file = strrchr(path_tmp, DEFAULT_SLASH);
#endif
if (!path_file) {
/* none of the path components exist. definitely not in open_basedir.. */
return -1;
} else {
path_len = path_file - path_tmp + 1;
#if defined(PHP_WIN32) || defined(NETWARE)
if (path_len > 1 && path_tmp[path_len - 2] == ':') {
if (path_len != 3) {
return -1;
}
/* this is c:\ */
path_tmp[path_len] = '\0';
} else {
path_tmp[path_len - 1] = '\0';
}
#else
path_tmp[path_len - 1] = '\0';
#endif
}
nesting_level++;
}
/* Resolve open_basedir to resolved_basedir */
if (expand_filepath(local_open_basedir, resolved_basedir TSRMLS_CC) != NULL) {
/* Handler for basedirs that end with a / */
resolved_basedir_len = strlen(resolved_basedir);
if (basedir[strlen(basedir) - 1] == PHP_DIR_SEPARATOR) {
if (resolved_basedir[resolved_basedir_len - 1] != PHP_DIR_SEPARATOR) {
resolved_basedir[resolved_basedir_len] = PHP_DIR_SEPARATOR;
resolved_basedir[++resolved_basedir_len] = '\0';
}
}
resolved_name_len = strlen(resolved_name);
if (path_tmp[path_len - 1] == PHP_DIR_SEPARATOR) {
if (resolved_name[resolved_name_len - 1] != PHP_DIR_SEPARATOR) {
resolved_name[resolved_name_len] = PHP_DIR_SEPARATOR;
resolved_name[++resolved_name_len] = '\0';
}
}
/* Check the path */
#if defined(PHP_WIN32) || defined(NETWARE)
if (strncasecmp(resolved_basedir, resolved_name, resolved_basedir_len) == 0) {
#else
if (strncmp(resolved_basedir, resolved_name, resolved_basedir_len) == 0) {
#endif
/* File is in the right directory */
return 0;
} else {
/* /openbasedir/ and /openbasedir are the same directory */
if (resolved_basedir_len == (resolved_name_len + 1) && resolved_basedir[resolved_basedir_len - 1] == PHP_DIR_SEPARATOR) {
#if defined(PHP_WIN32) || defined(NETWARE)
if (strncasecmp(resolved_basedir, resolved_name, resolved_name_len) == 0) {
#else
if (strncmp(resolved_basedir, resolved_name, resolved_name_len) == 0) {
#endif
return 0;
}
}
return -1;
}
} else {
/* Unable to resolve the real path, return -1 */
return -1;
}
}
/* }}} */
PHPAPI int php_check_open_basedir(const char *path TSRMLS_DC)
{
return php_check_open_basedir_ex(path, 1 TSRMLS_CC);
}
/* {{{ php_check_open_basedir
*/
PHPAPI int php_check_open_basedir_ex(const char *path, int warn TSRMLS_DC)
{
/* Only check when open_basedir is available */
if (PG(open_basedir) && *PG(open_basedir)) {
char *pathbuf;
char *ptr;
char *end;
pathbuf = estrdup(PG(open_basedir));
ptr = pathbuf;
while (ptr && *ptr) {
end = strchr(ptr, DEFAULT_DIR_SEPARATOR);
if (end != NULL) {
*end = '\0';
end++;
}
if (php_check_specific_open_basedir(ptr, path TSRMLS_CC) == 0) {
efree(pathbuf);
return 0;
}
ptr = end;
}
if (warn) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "open_basedir restriction in effect. File(%s) is not within the allowed path(s): (%s)", path, PG(open_basedir));
}
efree(pathbuf);
errno = EPERM; /* we deny permission to open it */
return -1;
}
/* Nothing to check... */
return 0;
}
/* }}} */
/* {{{ php_check_safe_mode_include_dir
*/
PHPAPI int php_check_safe_mode_include_dir(const char *path TSRMLS_DC)
{
if (PG(safe_mode)) {
if (PG(safe_mode_include_dir) && *PG(safe_mode_include_dir)) {
char *pathbuf;
char *ptr;
char *end;
char resolved_name[MAXPATHLEN];
/* Resolve the real path into resolved_name */
if (expand_filepath(path, resolved_name TSRMLS_CC) == NULL) {
return -1;
}
pathbuf = estrdup(PG(safe_mode_include_dir));
ptr = pathbuf;
while (ptr && *ptr) {
end = strchr(ptr, DEFAULT_DIR_SEPARATOR);
if (end != NULL) {
*end = '\0';
end++;
}
/* Check the path */
#ifdef PHP_WIN32
if (strncasecmp(ptr, resolved_name, strlen(ptr)) == 0)
#else
if (strncmp(ptr, resolved_name, strlen(ptr)) == 0)
#endif
{
/* File is in the right directory */
efree(pathbuf);
return 0;
}
ptr = end;
}
efree(pathbuf);
}
return -1;
}
/* Nothing to check... */
return 0;
}
/* }}} */
/* {{{ php_fopen_and_set_opened_path
*/
static FILE *php_fopen_and_set_opened_path(const char *path, const char *mode, char **opened_path TSRMLS_DC)
{
FILE *fp;
if (php_check_open_basedir((char *)path TSRMLS_CC)) {
return NULL;
}
fp = VCWD_FOPEN(path, mode);
if (fp && opened_path) {
*opened_path = expand_filepath(path, NULL TSRMLS_CC);
}
return fp;
}
/* }}} */
/* {{{ php_fopen_primary_script
*/
PHPAPI int php_fopen_primary_script(zend_file_handle *file_handle TSRMLS_DC)
{
FILE *fp;
#ifndef PHP_WIN32
struct stat st;
#endif
char *path_info, *filename;
int length;
filename = SG(request_info).path_translated;
path_info = SG(request_info).request_uri;
#if HAVE_PWD_H
if (PG(user_dir) && *PG(user_dir) && path_info && '/' == path_info[0] && '~' == path_info[1]) {
char *s = strchr(path_info + 2, '/');
filename = NULL; /* discard the original filename, it must not be used */
if (s) { /* if there is no path name after the file, do not bother */
char user[32]; /* to try open the directory */
struct passwd *pw;
#if defined(ZTS) && defined(HAVE_GETPWNAM_R) && defined(_SC_GETPW_R_SIZE_MAX)
struct passwd pwstruc;
long pwbuflen = sysconf(_SC_GETPW_R_SIZE_MAX);
char *pwbuf;
if (pwbuflen < 1) {
return FAILURE;
}
pwbuf = emalloc(pwbuflen);
#endif
length = s - (path_info + 2);
if (length > (int)sizeof(user) - 1) {
length = sizeof(user) - 1;
}
memcpy(user, path_info + 2, length);
user[length] = '\0';
#if defined(ZTS) && defined(HAVE_GETPWNAM_R) && defined(_SC_GETPW_R_SIZE_MAX)
if (getpwnam_r(user, &pwstruc, pwbuf, pwbuflen, &pw)) {
efree(pwbuf);
return FAILURE;
}
#else
pw = getpwnam(user);
#endif
if (pw && pw->pw_dir) {
spprintf(&filename, 0, "%s%c%s%c%s", pw->pw_dir, PHP_DIR_SEPARATOR, PG(user_dir), PHP_DIR_SEPARATOR, s + 1); /* Safe */
STR_FREE(SG(request_info).path_translated);
SG(request_info).path_translated = filename;
}
#if defined(ZTS) && defined(HAVE_GETPWNAM_R) && defined(_SC_GETPW_R_SIZE_MAX)
efree(pwbuf);
#endif
}
} else
#endif
if (PG(doc_root) && path_info) {
length = strlen(PG(doc_root));
if (IS_ABSOLUTE_PATH(PG(doc_root), length)) {
filename = emalloc(length + strlen(path_info) + 2);
if (filename) {
memcpy(filename, PG(doc_root), length);
if (!IS_SLASH(filename[length - 1])) { /* length is never 0 */
filename[length++] = PHP_DIR_SEPARATOR;
}
if (IS_SLASH(path_info[0])) {
length--;
}
strcpy(filename + length, path_info);
STR_FREE(SG(request_info).path_translated);
SG(request_info).path_translated = filename;
}
}
} /* if doc_root && path_info */
if (!filename) {
/* we have to free SG(request_info).path_translated here because
* php_destroy_request_info assumes that it will get
* freed when the include_names hash is emptied, but
* we're not adding it in this case */
STR_FREE(SG(request_info).path_translated);
SG(request_info).path_translated = NULL;
return FAILURE;
}
fp = VCWD_FOPEN(filename, "rb");
#ifndef PHP_WIN32
/* refuse to open anything that is not a regular file */
if (fp && (0 > fstat(fileno(fp), &st) || !S_ISREG(st.st_mode))) {
fclose(fp);
fp = NULL;
}
#endif
if (!fp) {
STR_FREE(SG(request_info).path_translated); /* for same reason as above */
SG(request_info).path_translated = NULL;
return FAILURE;
}
file_handle->opened_path = expand_filepath(filename, NULL TSRMLS_CC);
if (!(SG(options) & SAPI_OPTION_NO_CHDIR)) {
VCWD_CHDIR_FILE(filename);
}
SG(request_info).path_translated = filename;
file_handle->filename = SG(request_info).path_translated;
file_handle->free_filename = 0;
file_handle->handle.fp = fp;
file_handle->type = ZEND_HANDLE_FP;
return SUCCESS;
}
/* }}} */
/* {{{ php_resolve_path
* Returns the realpath for given filename according to include path
*/
PHPAPI char *php_resolve_path(const char *filename, int filename_length, const char *path TSRMLS_DC)
{
char resolved_path[MAXPATHLEN];
char trypath[MAXPATHLEN];
char *ptr, *end;
if (!filename) {
return NULL;
}
if (*filename == '.' ||
IS_ABSOLUTE_PATH(filename, filename_length) ||
!path ||
!*path) {
if (tsrm_realpath(filename, resolved_path TSRMLS_CC)) {
return estrdup(resolved_path);
} else {
return NULL;
}
}
ptr = path;
while (ptr && *ptr) {
end = strchr(ptr, DEFAULT_DIR_SEPARATOR);
if (end) {
if ((end-ptr) + 1 + filename_length + 1 >= MAXPATHLEN) {
ptr = end + 1;
continue;
}
memcpy(trypath, ptr, end-ptr);
trypath[end-ptr] = '/';
memcpy(trypath+(end-ptr)+1, filename, filename_length+1);
ptr = end+1;
} else {
int len = strlen(ptr);
if (len + 1 + filename_length + 1 >= MAXPATHLEN) {
break;
}
memcpy(trypath, ptr, len);
trypath[len] = '/';
memcpy(trypath+len+1, filename, filename_length+1);
ptr = NULL;
}
if (tsrm_realpath(trypath, resolved_path TSRMLS_CC)) {
return estrdup(resolved_path);
}
} /* end provided path */
/* check in calling scripts' current working directory as a fall back case
*/
if (zend_is_executing(TSRMLS_C)) {
char *exec_fname = zend_get_executed_filename(TSRMLS_C);
int exec_fname_length = strlen(exec_fname);
while ((--exec_fname_length >= 0) && !IS_SLASH(exec_fname[exec_fname_length]));
if (exec_fname && exec_fname[0] != '[' &&
exec_fname_length > 0 &&
exec_fname_length + 1 + filename_length + 1 < MAXPATHLEN) {
memcpy(trypath, exec_fname, exec_fname_length + 1);
memcpy(trypath+exec_fname_length + 1, filename, filename_length+1);
if (tsrm_realpath(trypath, resolved_path TSRMLS_CC)) {
return estrdup(resolved_path);
}
}
}
return NULL;
}
/* }}} */
/* {{{ php_fopen_with_path
* Tries to open a file with a PATH-style list of directories.
* If the filename starts with "." or "/", the path is ignored.
*/
PHPAPI FILE *php_fopen_with_path(const char *filename, const char *mode, const char *path, char **opened_path TSRMLS_DC)
{
char *pathbuf, *ptr, *end;
char *exec_fname;
char trypath[MAXPATHLEN];
struct stat sb;
FILE *fp;
int path_length;
int filename_length;
int exec_fname_length;
if (opened_path) {
*opened_path = NULL;
}
if (!filename) {
return NULL;
}
filename_length = strlen(filename);
/* Relative path open */
if (*filename == '.') {
if (PG(safe_mode) && (!php_checkuid(filename, mode, CHECKUID_CHECK_MODE_PARAM))) {
return NULL;
}
return php_fopen_and_set_opened_path(filename, mode, opened_path TSRMLS_CC);
}
/*
* files in safe_mode_include_dir (or subdir) are excluded from
* safe mode GID/UID checks
*/
/* Absolute path open */
if (IS_ABSOLUTE_PATH(filename, filename_length)) {
if (php_check_safe_mode_include_dir(filename TSRMLS_CC) == 0) {
/* filename is in safe_mode_include_dir (or subdir) */
return php_fopen_and_set_opened_path(filename, mode, opened_path TSRMLS_CC);
}
if (PG(safe_mode) && (!php_checkuid(filename, mode, CHECKUID_CHECK_MODE_PARAM))) {
return NULL;
}
return php_fopen_and_set_opened_path(filename, mode, opened_path TSRMLS_CC);
}
if (!path || (path && !*path)) {
if (PG(safe_mode) && (!php_checkuid(filename, mode, CHECKUID_CHECK_MODE_PARAM))) {
return NULL;
}
return php_fopen_and_set_opened_path(filename, mode, opened_path TSRMLS_CC);
}
/* check in provided path */
/* append the calling scripts' current working directory
* as a fall back case
*/
if (zend_is_executing(TSRMLS_C)) {
exec_fname = zend_get_executed_filename(TSRMLS_C);
exec_fname_length = strlen(exec_fname);
path_length = strlen(path);
while ((--exec_fname_length >= 0) && !IS_SLASH(exec_fname[exec_fname_length]));
if ((exec_fname && exec_fname[0] == '[') || exec_fname_length <= 0) {
/* [no active file] or no path */
pathbuf = estrdup(path);
} else {
pathbuf = (char *) emalloc(exec_fname_length + path_length + 1 + 1);
memcpy(pathbuf, path, path_length);
pathbuf[path_length] = DEFAULT_DIR_SEPARATOR;
memcpy(pathbuf + path_length + 1, exec_fname, exec_fname_length);
pathbuf[path_length + exec_fname_length + 1] = '\0';
}
} else {
pathbuf = estrdup(path);
}
ptr = pathbuf;
while (ptr && *ptr) {
end = strchr(ptr, DEFAULT_DIR_SEPARATOR);
if (end != NULL) {
*end = '\0';
end++;
}
snprintf(trypath, MAXPATHLEN, "%s/%s", ptr, filename);
if (PG(safe_mode)) {
if (VCWD_STAT(trypath, &sb) == 0) {
/* file exists ... check permission */
if (php_check_safe_mode_include_dir(trypath TSRMLS_CC) == 0 ||
php_checkuid(trypath, mode, CHECKUID_CHECK_MODE_PARAM)
) {
/* UID ok, or trypath is in safe_mode_include_dir */
fp = php_fopen_and_set_opened_path(trypath, mode, opened_path TSRMLS_CC);
} else {
fp = NULL;
}
efree(pathbuf);
return fp;
}
}
fp = php_fopen_and_set_opened_path(trypath, mode, opened_path TSRMLS_CC);
if (fp) {
efree(pathbuf);
return fp;
}
ptr = end;
} /* end provided path */
efree(pathbuf);
return NULL;
}
/* }}} */
/* {{{ php_strip_url_passwd
*/
PHPAPI char *php_strip_url_passwd(char *url)
{
register char *p, *url_start;
if (url == NULL) {
return "";
}
p = url;
while (*p) {
if (*p == ':' && *(p + 1) == '/' && *(p + 2) == '/') {
/* found protocol */
url_start = p = p + 3;
while (*p) {
if (*p == '@') {
int i;
for (i = 0; i < 3 && url_start < p; i++, url_start++) {
*url_start = '.';
}
for (; *p; p++) {
*url_start++ = *p;
}
*url_start=0;
break;
}
p++;
}
return url;
}
p++;
}
return url;
}
/* }}} */
/* {{{ expand_filepath
*/
PHPAPI char *expand_filepath(const char *filepath, char *real_path TSRMLS_DC)
{
cwd_state new_state;
char cwd[MAXPATHLEN];
int copy_len;
if (!filepath[0]) {
return NULL;
} else if (IS_ABSOLUTE_PATH(filepath, strlen(filepath))) {
cwd[0] = '\0';
} else {
const char *iam = SG(request_info).path_translated;
char *result = VCWD_GETCWD(cwd, MAXPATHLEN);
if (!result && (iam != filepath)) {
int fdtest = -1;
fdtest = VCWD_OPEN(filepath, O_RDONLY);
if (fdtest != -1) {
/* return a relative file path if for any reason
* we cannot cannot getcwd() and the requested,
* relatively referenced file is accessible */
copy_len = strlen(filepath) > MAXPATHLEN - 1 ? MAXPATHLEN - 1 : strlen(filepath);
real_path = estrndup(filepath, copy_len);
close(fdtest);
return real_path;
} else {
cwd[0] = '\0';
}
} else if (!result) {
cwd[0] = '\0';
}
}
new_state.cwd = strdup(cwd);
new_state.cwd_length = strlen(cwd);
if (virtual_file_ex(&new_state, filepath, NULL, CWD_FILEPATH)) {
free(new_state.cwd);
return NULL;
}
if (real_path) {
copy_len = new_state.cwd_length > MAXPATHLEN - 1 ? MAXPATHLEN - 1 : new_state.cwd_length;
memcpy(real_path, new_state.cwd, copy_len);
real_path[copy_len] = '\0';
} else {
real_path = estrndup(new_state.cwd, new_state.cwd_length);
}
free(new_state.cwd);
return real_path;
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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