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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1996, 1998-2005, 2007-2016
* Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <sudoers.h>
#include <toke.h>
#include <gram.h>
static size_t arg_len = 0;
static size_t arg_size = 0;
/*
* Copy the string and collapse any escaped characters.
* Requires that dst have at least len + 1 bytes free.
*/
static void
copy_string(char *dst, const char *src, size_t len)
{
int h;
while (len--) {
if (*src == '\\' && len) {
if (src[1] == 'x' && len >= 3 && (h = sudo_hexchar(src + 2)) != -1) {
*dst++ = (char)h;
src += 4;
len -= 3;
} else {
src++;
len--;
*dst++ = *src++;
}
} else {
*dst++ = *src++;
}
}
*dst = '\0';
}
bool
fill(const char *src, int ilen)
{
const size_t len = (size_t)ilen;
char *dst;
debug_decl(fill, SUDOERS_DEBUG_PARSER);
dst = malloc(len + 1);
if (dst == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
sudoerserror(NULL);
debug_return_bool(false);
}
parser_leak_add(LEAK_PTR, dst);
copy_string(dst, src, len);
sudoerslval.string = dst;
debug_return_bool(true);
}
bool
append(const char *src, int ilen)
{
const size_t len = (size_t)ilen;
size_t olen = 0;
char *dst;
debug_decl(append, SUDOERS_DEBUG_PARSER);
if (sudoerslval.string != NULL) {
olen = strlen(sudoerslval.string);
parser_leak_remove(LEAK_PTR, sudoerslval.string);
}
dst = realloc(sudoerslval.string, olen + len + 1);
if (dst == NULL) {
/* realloc failure, avoid leaking original */
free(sudoerslval.string);
sudoerslval.string = NULL;
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
sudoerserror(NULL);
debug_return_bool(false);
}
parser_leak_add(LEAK_PTR, dst);
copy_string(dst + olen, src, len);
sudoerslval.string = dst;
debug_return_bool(true);
}
#define SPECIAL(c) \
((c) == ',' || (c) == ':' || (c) == '=' || (c) == ' ' || (c) == '\t' || (c) == '#')
bool
fill_cmnd(const char *src, int ilen)
{
const size_t len = (size_t)ilen;
char *dst;
size_t i;
debug_decl(fill_cmnd, SUDOERS_DEBUG_PARSER);
arg_len = arg_size = 0;
dst = sudoerslval.command.cmnd = malloc(len + 1);
if (dst == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
sudoerserror(NULL);
debug_return_bool(false);
}
sudoerslval.command.args = NULL;
if (src[0] == '^') {
/* Copy the regular expression, no escaped sudo-specific characters. */
memcpy(dst, src, len);
dst[len] = '\0';
} else {
/* Copy the string and collapse any escaped sudo-specific characters. */
for (i = 0; i < len; i++) {
if (src[i] == '\\' && i != len - 1 && SPECIAL(src[i + 1]))
*dst++ = src[++i];
else
*dst++ = src[i];
}
*dst = '\0';
/* Check for sudoedit specified as a fully-qualified path. */
if ((dst = strrchr(sudoerslval.command.cmnd, '/')) != NULL) { // -V575
if (strcmp(dst, "/sudoedit") == 0) {
if (sudoers_strict()) {
sudoerserror(
N_("sudoedit should not be specified with a path"));
}
free(sudoerslval.command.cmnd);
if ((sudoerslval.command.cmnd = strdup("sudoedit")) == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
debug_return_bool(false);
}
}
}
}
parser_leak_add(LEAK_PTR, sudoerslval.command.cmnd);
debug_return_bool(true);
}
bool
fill_args(const char *s, int ilen, bool addspace)
{
size_t len = (size_t)ilen;
size_t new_len;
char *p;
debug_decl(fill_args, SUDOERS_DEBUG_PARSER);
if (arg_size == 0) {
#ifdef NO_LEAKS
if (sudoerslval.command.args != NULL) {
sudo_warnx("%s: command.args %p, should be NULL", __func__,
sudoerslval.command.args);
sudoerslval.command.args = NULL;
}
#endif
addspace = 0;
new_len = len;
} else {
new_len = arg_len + len + addspace;
}
if (new_len >= arg_size) {
/* Allocate in increments of 128 bytes to avoid excessive realloc(). */
arg_size = (new_len + 1 + 127) & ~127U;
parser_leak_remove(LEAK_PTR, sudoerslval.command.args);
p = realloc(sudoerslval.command.args, arg_size);
if (p == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
parser_leak_add(LEAK_PTR, p);
sudoerslval.command.args = p;
}
/* Efficiently append the arg (with a leading space if needed). */
p = sudoerslval.command.args + arg_len;
if (addspace)
*p++ = ' ';
len = arg_size - (size_t)(p - sudoerslval.command.args);
if (strlcpy(p, s, len) >= len) {
sudo_warnx(U_("internal error, %s overflow"), __func__);
parser_leak_remove(LEAK_PTR, sudoerslval.command.args);
goto bad;
}
arg_len = new_len;
debug_return_bool(true);
bad:
sudoerserror(NULL);
free(sudoerslval.command.args);
sudoerslval.command.args = NULL;
arg_len = arg_size = 0;
debug_return_bool(false);
}
/*
* Check to make sure an IPv6 address does not contain multiple instances
* of the string "::". Assumes strlen(s) >= 1.
* Returns true if address is valid else false.
*/
bool
ipv6_valid(const char *s)
{
int nmatch = 0;
debug_decl(ipv6_valid, SUDOERS_DEBUG_PARSER);
for (; *s != '\0'; s++) {
if (s[0] == ':' && s[1] == ':') {
if (++nmatch > 1)
break;
}
if (s[0] == '/')
nmatch = 0; /* reset if we hit netmask */
}
debug_return_bool(nmatch <= 1);
}
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