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patch 9.0.2070: [security] disallow setting env in restricted mode Commit: https://github.com/vim/vim/commit/6b89dd6a7257a1e2e9c7ea070b407bc4674a5118 Author: Christian Brabandt <cb@256bit.org> Date: Thu Oct 26 22:14:17 2023 +0200 patch 9.0.2070: [security] disallow setting env in restricted mode Problem: [security] disallow setting env in restricted mode Solution: Setting environment variables in restricted mode could potentially be used to execute shell commands. Disallow this. restricted mode: disable allow setting of environment variables Setting environment variables in restricted mode, may have some unwanted consequences. So, for example by setting $GCONV_PATH in restricted mode and then calling the iconv() function, one may be able to execute some unwanted payload, because the `iconv_open()` function internally uses the `$GCONV_PATH` variable to find its conversion data. So let's disable setting environment variables, even so this is no complete protection, since we are not clearing the existing environment. I tried a few ways but wasn't successful :( One could also argue to disable the iconv() function completely in restricted mode, but who knows what other API functions can be influenced by setting some other unrelated environment variables. So let's leave it as it is currently. closes: #13394 See: https://huntr.com/bounties/b0a2eda1-459c-4e36-98e6-0cc7d7faccfe/ Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Thu, 26 Oct 2023 22:30:03 +0200
parents f41b55f9357c
children
line wrap: on
line source

/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * json_test.c: Unittests for json.c
 */

#undef NDEBUG
#include <assert.h>

// Must include main.c because it contains much more than just main()
#define NO_VIM_MAIN
#include "main.c"

// This file has to be included because the tested functions are static
#include "json.c"

#if defined(FEAT_EVAL)
/*
 * Test json_find_end() with incomplete items.
 */
    static void
test_decode_find_end(void)
{
    js_read_T reader;

    reader.js_fill = NULL;
    reader.js_used = 0;

    // string and incomplete string
    reader.js_buf = (char_u *)"\"hello\"";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  \"hello\" ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"\"hello";
    assert(json_find_end(&reader, 0) == MAYBE);

    // number and dash (incomplete number)
    reader.js_buf = (char_u *)"123";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"-";
    assert(json_find_end(&reader, 0) == MAYBE);

    // false, true and null, also incomplete
    reader.js_buf = (char_u *)"false";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"f";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"fa";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"fal";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"fals";
    assert(json_find_end(&reader, 0) == MAYBE);

    reader.js_buf = (char_u *)"true";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"t";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"tr";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"tru";
    assert(json_find_end(&reader, 0) == MAYBE);

    reader.js_buf = (char_u *)"null";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"n";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"nu";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"nul";
    assert(json_find_end(&reader, 0) == MAYBE);

    // object without white space
    reader.js_buf = (char_u *)"{\"a\":123}";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"{\"a\":123";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"{\"a\":";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"{\"a\"";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"{\"a";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"{\"";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"{";
    assert(json_find_end(&reader, 0) == MAYBE);

    // object with white space
    reader.js_buf = (char_u *)"  {  \"a\"  :  123  }  ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  {  \"a\"  :  123  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  {  \"a\"  :  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  {  \"a\"  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  {  \"a  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  {   ";
    assert(json_find_end(&reader, 0) == MAYBE);

    // JS object with white space
    reader.js_buf = (char_u *)"  {  a  :  123  }  ";
    assert(json_find_end(&reader, JSON_JS) == OK);
    reader.js_buf = (char_u *)"  {  a  :   ";
    assert(json_find_end(&reader, JSON_JS) == MAYBE);

    // array without white space
    reader.js_buf = (char_u *)"[\"a\",123]";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"[\"a\",123";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"[\"a\",";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"[\"a\"";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"[\"a";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"[\"";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"[";
    assert(json_find_end(&reader, 0) == MAYBE);

    // array with white space
    reader.js_buf = (char_u *)"  [  \"a\"  ,  123  ]  ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  [  \"a\"  ,  123  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  [  \"a\"  ,  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  [  \"a\"  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  [  \"a  ";
    assert(json_find_end(&reader, 0) == MAYBE);
    reader.js_buf = (char_u *)"  [  ";
    assert(json_find_end(&reader, 0) == MAYBE);
}

    static int
fill_from_cookie(js_read_T *reader)
{
    reader->js_buf = reader->js_cookie;
    return TRUE;
}

/*
 * Test json_find_end with an incomplete array, calling the fill function.
 */
    static void
test_fill_called_on_find_end(void)
{
    js_read_T reader;

    reader.js_fill = fill_from_cookie;
    reader.js_used = 0;
    reader.js_buf = (char_u *)"  [  \"a\"  ,  123  ";
    reader.js_cookie =	      "  [  \"a\"  ,  123  ]  ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  [  \"a\"  ,  ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  [  \"a\"  ";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  [  \"a";
    assert(json_find_end(&reader, 0) == OK);
    reader.js_buf = (char_u *)"  [  ";
    assert(json_find_end(&reader, 0) == OK);
}

/*
 * Test json_find_end with an incomplete string, calling the fill function.
 */
    static void
test_fill_called_on_string(void)
{
    js_read_T reader;

    reader.js_fill = fill_from_cookie;
    reader.js_used = 0;
    reader.js_buf = (char_u *)" \"foo";
    reader.js_end = reader.js_buf + STRLEN(reader.js_buf);
    reader.js_cookie =	      " \"foobar\"  ";
    assert(json_decode_string(&reader, NULL, '"') == OK);
}
#endif

    int
main(void)
{
#if defined(FEAT_EVAL)
    test_decode_find_end();
    test_fill_called_on_find_end();
    test_fill_called_on_string();
#endif
    return 0;
}