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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2004-2005, 2007-2018, 2021-2022
* 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.
*/
/*
* 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 <errno.h>
#include "sudoers.h"
#include <gram.h>
struct alias_warned {
SLIST_ENTRY(alias_warned) entries;
const char *name;
};
SLIST_HEAD(alias_warned_list, alias_warned);
static bool alias_warnx(const char *file, int line, int column, bool strict, bool quiet, const char *fmt, ...) sudo_printflike(6, 7);
static bool
alias_warned(struct alias_warned_list *warned, char *name)
{
struct alias_warned *w;
debug_decl(alias_warned, SUDOERS_DEBUG_ALIAS);
SLIST_FOREACH(w, warned, entries) {
if (strcmp(w->name, name) == 0)
debug_return_bool(true);
}
debug_return_bool(false);
}
static void
alias_warned_add(struct alias_warned_list *warned, char *name)
{
struct alias_warned *w;
debug_decl(alias_warned_add, SUDOERS_DEBUG_ALIAS);
w = malloc(sizeof(*w));
if (w != NULL) {
w->name = name;
SLIST_INSERT_HEAD(warned, w, entries);
}
debug_return;
}
static bool
alias_warnx(const char *file, int line, int column, bool strict, bool quiet,
const char *fmt, ...)
{
bool ret = true;
va_list ap;
debug_decl(alias_warnx, SUDOERS_DEBUG_ALIAS);
if (strict && sudoers_error_hook != NULL) {
va_start(ap, fmt);
ret = sudoers_error_hook(file, line, column, fmt, ap);
va_end(ap);
}
if (!quiet) {
int oldlocale;
char *errstr;
sudoers_setlocale(SUDOERS_LOCALE_USER, &oldlocale);
va_start(ap, fmt);
if (vasprintf(&errstr, _(fmt), ap) == -1) {
errstr = NULL;
ret = false;
} else if (line > 0) {
sudo_printf(SUDO_CONV_ERROR_MSG, _("%s:%d:%d: %s\n"), file,
line, column, errstr);
} else {
sudo_printf(SUDO_CONV_ERROR_MSG, _("%s: %s\n"), file, errstr);
}
va_end(ap);
sudoers_setlocale(oldlocale, NULL);
free(errstr);
}
debug_return_bool(ret);
}
static int
check_alias(struct sudoers_parse_tree *parse_tree,
struct alias_warned_list *warned, char *name, int type,
char *file, int line, int column, bool strict, bool quiet)
{
struct member *m;
struct alias *a;
int errors = 0;
debug_decl(check_alias, SUDOERS_DEBUG_ALIAS);
if ((a = alias_get(parse_tree, name, type)) != NULL) {
/* check alias contents */
TAILQ_FOREACH(m, &a->members, entries) {
if (m->type != ALIAS)
continue;
errors += check_alias(parse_tree, warned, m->name, type,
a->file, a->line, a->column, strict, quiet);
}
alias_put(a);
} else {
if (!alias_warned(warned, name)) {
if (errno == ELOOP) {
alias_warnx(file, line, column, strict, quiet,
N_("cycle in %s \"%s\""), alias_type_to_string(type), name);
} else {
alias_warnx(file, line, column, strict, quiet,
N_("%s \"%s\" referenced but not defined"),
alias_type_to_string(type), name);
}
alias_warned_add(warned, name);
}
errors++;
}
debug_return_int(errors);
}
/*
* Iterate through the sudoers datastructures looking for undefined
* aliases or unused aliases.
* In strict mode, returns the number of errors, else 0.
*/
int
check_aliases(struct sudoers_parse_tree *parse_tree, bool strict, bool quiet,
int (*cb_unused)(struct sudoers_parse_tree *, struct alias *, void *))
{
struct alias_warned_list warned = SLIST_HEAD_INITIALIZER(warned);
struct rbtree *used_aliases;
struct alias_warned *w;
struct cmndspec *cs;
struct member *m;
struct privilege *priv;
struct userspec *us;
int errors = 0;
debug_decl(check_aliases, SUDOERS_DEBUG_ALIAS);
used_aliases = alloc_aliases();
if (used_aliases == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_int(-1);
}
/* Forward check. */
TAILQ_FOREACH(us, &parse_tree->userspecs, entries) {
TAILQ_FOREACH(m, &us->users, entries) {
if (m->type == ALIAS) {
errors += check_alias(parse_tree, &warned, m->name, USERALIAS,
us->file, us->line, us->column, strict, quiet);
}
}
TAILQ_FOREACH(priv, &us->privileges, entries) {
TAILQ_FOREACH(m, &priv->hostlist, entries) {
if (m->type == ALIAS) {
errors += check_alias(parse_tree, &warned, m->name, HOSTALIAS,
us->file, us->line, us->column, strict, quiet);
}
}
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
if (cs->runasuserlist != NULL) {
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
if (m->type == ALIAS) {
errors += check_alias(parse_tree, &warned, m->name, RUNASALIAS,
us->file, us->line, us->column, strict, quiet);
}
}
}
if (cs->runasgrouplist != NULL) {
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
if (m->type == ALIAS) {
errors += check_alias(parse_tree, &warned, m->name, RUNASALIAS,
us->file, us->line, us->column, strict, quiet);
}
}
}
if ((m = cs->cmnd)->type == ALIAS) {
errors += check_alias(parse_tree, &warned, m->name, CMNDALIAS,
us->file, us->line, us->column, strict, quiet);
}
}
}
}
while ((w = SLIST_FIRST(&warned)) != NULL) {
SLIST_REMOVE_HEAD(&warned, entries);
free(w);
}
/* Reverse check (destructive) */
if (!alias_find_used(parse_tree, used_aliases))
errors++;
free_aliases(used_aliases);
/* If all aliases were referenced we will have an empty tree. */
if (!no_aliases(parse_tree))
alias_apply(parse_tree, cb_unused, &quiet);
debug_return_int(strict ? errors : 0);
}
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