132 lines
4.4 KiB
Diff
132 lines
4.4 KiB
Diff
From f15f8fc573eb38c3c73e23e0930063a6f6409ed4 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Tue, 1 Sep 2020 10:04:28 +0200
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Subject: [PATCH] Fix #79971: special character is breaking the path in xml
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function
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The libxml based XML functions accepting a filename actually accept
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URIs with possibly percent-encoded characters. Percent-encoded NUL
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bytes lead to truncation, like non-encoded NUL bytes would. We catch
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those, and let the functions fail with a respective warning.
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---
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ext/dom/domimplementation.c | 5 +++++
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ext/dom/tests/bug79971_2.phpt | 20 ++++++++++++++++++++
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ext/libxml/libxml.c | 9 +++++++++
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ext/simplexml/tests/bug79971_1.phpt | 27 +++++++++++++++++++++++++++
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ext/simplexml/tests/bug79971_1.xml | 2 ++
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5 files changed, 63 insertions(+)
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create mode 100644 ext/dom/tests/bug79971_2.phpt
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create mode 100644 ext/simplexml/tests/bug79971_1.phpt
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create mode 100644 ext/simplexml/tests/bug79971_1.xml
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diff --git a/ext/dom/domimplementation.c b/ext/dom/domimplementation.c
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index c6629c85e965..6f59f9c7c89f 100644
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--- a/ext/dom/domimplementation.c
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+++ b/ext/dom/domimplementation.c
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@@ -112,6 +112,11 @@ PHP_METHOD(domimplementation, createDocumentType)
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pch2 = (xmlChar *) systemid;
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}
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+ if (strstr(name, "%00")) {
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+ php_error_docref(NULL, E_WARNING, "URI must not contain percent-encoded NUL bytes");
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+ RETURN_FALSE;
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+ }
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+
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uri = xmlParseURI(name);
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if (uri != NULL && uri->opaque != NULL) {
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localname = xmlStrdup((xmlChar *) uri->opaque);
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diff --git a/ext/dom/tests/bug79971_2.phpt b/ext/dom/tests/bug79971_2.phpt
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new file mode 100644
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index 000000000000..c4e6b1e4e093
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--- /dev/null
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+++ b/ext/dom/tests/bug79971_2.phpt
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@@ -0,0 +1,20 @@
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+--TEST--
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+Bug #79971 (special character is breaking the path in xml function)
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+--SKIPIF--
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+<?php
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+if (!extension_loaded('dom')) die('skip dom extension not available');
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+?>
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+--FILE--
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+<?php
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+$imp = new DOMImplementation;
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+if (PHP_OS_FAMILY === 'Windows') {
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+ $path = '/' . str_replace('\\', '/', __DIR__);
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+} else {
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+ $path = __DIR__;
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+}
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+$uri = "file://$path/bug79971_2.xml";
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+var_dump($imp->createDocumentType("$uri%00foo"));
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+?>
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+--EXPECTF--
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+Warning: DOMImplementation::createDocumentType(): URI must not contain percent-encoded NUL bytes in %s on line %d
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+bool(false)
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diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
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index 2be6a5b47a06..72ceea63274c 100644
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--- a/ext/libxml/libxml.c
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+++ b/ext/libxml/libxml.c
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@@ -306,6 +306,10 @@ static void *php_libxml_streams_IO_open_wrapper(const char *filename, const char
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int isescaped=0;
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xmlURI *uri;
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+ if (strstr(filename, "%00")) {
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+ php_error_docref(NULL, E_WARNING, "URI must not contain percent-encoded NUL bytes");
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+ return NULL;
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+ }
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uri = xmlParseURI(filename);
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if (uri && (uri->scheme == NULL ||
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@@ -437,6 +441,11 @@ php_libxml_output_buffer_create_filename(const char *URI,
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if (URI == NULL)
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return(NULL);
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+ if (strstr(URI, "%00")) {
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+ php_error_docref(NULL, E_WARNING, "URI must not contain percent-encoded NUL bytes");
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+ return NULL;
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+ }
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+
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puri = xmlParseURI(URI);
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if (puri != NULL) {
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if (puri->scheme != NULL)
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diff --git a/ext/simplexml/tests/bug79971_1.phpt b/ext/simplexml/tests/bug79971_1.phpt
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new file mode 100644
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index 000000000000..197776d82d38
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--- /dev/null
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+++ b/ext/simplexml/tests/bug79971_1.phpt
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@@ -0,0 +1,27 @@
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+--TEST--
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+Bug #79971 (special character is breaking the path in xml function)
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+--SKIPIF--
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+<?php
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+if (!extension_loaded('simplexml')) die('skip simplexml extension not available');
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+?>
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+--FILE--
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+<?php
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+if (PHP_OS_FAMILY === 'Windows') {
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+ $path = '/' . str_replace('\\', '/', __DIR__);
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+} else {
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+ $path = __DIR__;
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+}
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+$uri = "file://$path/bug79971_1.xml";
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+var_dump(simplexml_load_file("$uri%00foo"));
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+
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+$sxe = simplexml_load_file($uri);
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+var_dump($sxe->asXML("$uri.out%00foo"));
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+?>
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+--EXPECTF--
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+Warning: simplexml_load_file(): URI must not contain percent-encoded NUL bytes in %s on line %d
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+
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+Warning: simplexml_load_file(): I/O warning : failed to load external entity "%s/bug79971_1.xml%00foo" in %s on line %d
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+bool(false)
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+
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+Warning: SimpleXMLElement::asXML(): URI must not contain percent-encoded NUL bytes in %s on line %d
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+bool(false)
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diff --git a/ext/simplexml/tests/bug79971_1.xml b/ext/simplexml/tests/bug79971_1.xml
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new file mode 100644
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index 000000000000..912bb76d9d7e
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--- /dev/null
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+++ b/ext/simplexml/tests/bug79971_1.xml
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@@ -0,0 +1,2 @@
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+<?xml version="1.0"?>
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+<root></root>
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