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-rw-r--r--plugins/sudoers/toke_util.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/plugins/sudoers/toke_util.c b/plugins/sudoers/toke_util.c
new file mode 100644
index 0000000..d38ae96
--- /dev/null
+++ b/plugins/sudoers/toke_util.c
@@ -0,0 +1,248 @@
+/*
+ * 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 unsigned int arg_len = 0;
+static unsigned int 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++ = h;
+ src += 4;
+ len -= 3;
+ } else {
+ src++;
+ len--;
+ *dst++ = *src++;
+ }
+ } else {
+ *dst++ = *src++;
+ }
+ }
+ *dst = '\0';
+}
+
+bool
+fill(const char *src, size_t len)
+{
+ 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, size_t len)
+{
+ 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, size_t len)
+{
+ 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, size_t len, int addspace)
+{
+ unsigned int 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) & ~127;
+
+ 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 - (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);
+}