check_util.c

/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2019-2020, 2023 Todd C. Miller <[email protected]>
 *
 * 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.
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>

#include <sudoers.h>

/*
 * Check whether specified runchroot matches def_runchroot.
 * Returns true if matched, false if not matched and -1 on error.
 */
int
check_user_runchroot(const char *runchroot)
{
    debug_decl(check_user_runchroot, SUDOERS_DEBUG_AUTH);

    if (runchroot == NULL)
	debug_return_bool(true);

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
	"def_runchroot %s, runchroot %s",
	def_runchroot ? def_runchroot : "none", runchroot ? runchroot : "none");

    /* User may only specify a root dir if runchroot is "*" */
    if (def_runchroot == NULL || strcmp(def_runchroot, "*") != 0)
	debug_return_bool(false);

    free(def_runchroot);
    if ((def_runchroot = strdup(runchroot)) == NULL) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	debug_return_int(-1);
    }
    debug_return_bool(true);
}

/*
 * Check whether specified runcwd matches def_runcwd.
 * Returns true if matched, false if not matched and -1 on error.
 */
int
check_user_runcwd(const char *runcwd)
{
    debug_decl(check_user_runcwd, SUDOERS_DEBUG_AUTH);

    if (runcwd == NULL)
	debug_return_bool(true);

    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
        "def_runcwd %s, runcwd %s", def_runcwd ? def_runcwd : "none",
        runcwd ? runcwd : "none");

    /* User may only specify a cwd if runcwd is "*" */
    if (def_runcwd == NULL || strcmp(def_runcwd, "*") != 0)
        debug_return_bool(false);

    free(def_runcwd);
    if ((def_runcwd = strdup(runcwd)) == NULL) {
	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
	debug_return_int(-1);
    }
    debug_return_bool(true);
}