MFH: - Changed open_basedir to allow tightening in runtime contexts. (Sara)

- Add test

NEWS

@@ -3,6 +3,7 @@ PHP                                                                        NEWS
 ?? ??? 200?, PHP 5.3.0 Alpha 4
 - Changed opendir/dir/scandir to use default context
   when no context argument is passed. (Sara)
+- Changed open_basedir to allow tightening in runtime contexts. (Sara)
 
 - Fixed bug #46811 ini_set() doesn't return false on failure. (Hannes)
 

ext/standard/tests/directory/open_basedir_001.phpt

@@ -0,0 +1,17 @@
+--TEST--
+openbase_dir runtime tightning
+--INI--
+open_basedir=/usr/local
+--FILE--
+<?php
+var_dump(ini_set("open_basedir", "/usr/local/bin"));
+var_dump(ini_get("open_basedir"));
+var_dump(ini_set("open_basedir", "/usr"));
+var_dump(ini_get("open_basedir"));
+?>
+--EXPECT--
+string(10) "/usr/local"
+string(14) "/usr/local/bin"
+bool(false)
+string(14) "/usr/local/bin"
+

main/fopen_wrappers.c

@@ -79,6 +79,62 @@
 #endif
 /* }}} */
 
+/* {{{ OnUpdateBaseDir
+Allows any change to open_basedir setting in during Startup and Shutdown events,
+or a tightening during activation/runtime/deactivation */
+PHPAPI ZEND_INI_MH(OnUpdateBaseDir)
+{
+	char **p, *pathbuf, *ptr, *end;
+#ifndef ZTS
+	char *base = (char *) mh_arg2;
+#else
+	char *base = (char *) ts_resource(*((int *) mh_arg2));
+#endif
+
+	p = (char **) (base + (size_t) mh_arg1);
+
+	if (stage == PHP_INI_STAGE_STARTUP || stage == PHP_INI_STAGE_SHUTDOWN) {
+		/* We're in a PHP_INI_SYSTEM context, no restrictions */
+		*p = new_value;
+		return SUCCESS;
+	}
+
+	/* Otherwise we're in runtime */
+	if (!*p || !**p) {
+		/* open_basedir not set yet, go ahead and give it a value */
+		*p = new_value;
+		return SUCCESS;
+	}
+
+	/* Shortcut: When we have a open_basedir and someone tries to unset, we know it'll fail */
+	if (!new_value || !*new_value) {
+		return FAILURE;
+	}
+
+	/* Is the proposed open_basedir at least as restrictive as the current setting? */
+	ptr = pathbuf = estrdup(new_value);
+	while (ptr && *ptr) {
+		end = strchr(ptr, DEFAULT_DIR_SEPARATOR);
+		if (end != NULL) {
+			*end = '\0';
+			end++;
+		}
+		if (php_check_open_basedir_ex(ptr, 0 TSRMLS_CC) != 0) {
+			/* At least one portion of this open_basedir is less restrictive than the prior one, FAIL */
+			efree(pathbuf);
+			return FAILURE;
+		}
+		ptr = end;
+	}
+	efree(pathbuf);
+
+	/* Everything checks out, set it */
+	*p = new_value;
+
+	return SUCCESS;
+}
+/* }}} */
+
 /* {{{ 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.

main/fopen_wrappers.h

@@ -23,6 +23,7 @@
 
 BEGIN_EXTERN_C()
 #include "php_globals.h"
+#include "php_ini.h"
 
 PHPAPI int php_fopen_primary_script(zend_file_handle *file_handle TSRMLS_DC);
 PHPAPI char *expand_filepath(const char *filepath, char *real_path TSRMLS_DC);
@@ -39,6 +40,8 @@ PHPAPI char *php_resolve_path(const char *filename, int filename_len, const char
 PHPAPI FILE *php_fopen_with_path(const char *filename, const char *mode, const char *path, char **opened_path TSRMLS_DC);
 
 PHPAPI char *php_strip_url_passwd(char *path);
+
+PHPAPI ZEND_INI_MH(OnUpdateBaseDir);
 END_EXTERN_C()
 
 #endif