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/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 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
#include <windows.h>
#include <winsock.h>
#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
#ifdef PHP_WIN32
#include "win32/pwd.h"
#else
#include <pwd.h>
#endif
#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 <winsock.h>
#elif defined(NETWARE) && defined(USE_WINSOCK)
/*#include <ws2nlm.h>*/
#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];
int resolved_basedir_len;
int resolved_name_len;

/* 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));
}

/* Resolve the real path into resolved_name */
if ((expand_filepath(path, resolved_name TSRMLS_CC) != NULL) && (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';
}
}

if (path[strlen(path)-1] == PHP_DIR_SEPARATOR) {
resolved_name_len = strlen(resolved_name);
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 */
#ifdef PHP_WIN32
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 {
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(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, 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;
struct stat st;
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 user[32];
struct passwd *pw;
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 */
/* to try open the directory */
length = s - (path_info + 2);
if (length > sizeof(user) - 1)
length = sizeof(user) - 1;
memcpy(user, path_info + 2, length);
user[length] = '\0';

pw = getpwnam(user);
if (pw && pw->pw_dir) {
filename = emalloc(strlen(PG(user_dir)) + strlen(path_info) + strlen(pw->pw_dir) + 4);
if (filename) {
sprintf(filename, "%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;
}
}
}
} 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");

/* 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;
}
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_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(char *filename, char *mode, 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, *url_start;

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];
char *result;

result = VCWD_GETCWD(cwd, MAXPATHLEN);
if (!result) {
cwd[0] = '\0';
}

new_state.cwd = strdup(cwd);
new_state.cwd_length = strlen(cwd);

if(virtual_file_ex(&new_state, filepath, NULL, 1)) {
free(new_state.cwd);
return NULL;
}

if(real_path) {
int 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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