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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2022 Will Shand <wss2ec@virginia.edu>
*
* 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>
#ifdef HAVE_APPARMOR
# include <stdio.h>
# include <stdlib.h>
# include <sys/apparmor.h>
# include <sudo.h>
# include <sudo_debug.h>
/**
* @brief Check whether AppArmor is enabled.
*
* @return 1 if AppArmor is enabled, 0 otherwise.
*/
int
apparmor_is_enabled(void)
{
int ret;
FILE *fd;
debug_decl(apparmor_is_enabled, SUDO_DEBUG_APPARMOR);
/*
* Check whether AppArmor is enabled by reading
* /sys/module/apparmor/parameters/enabled
*
* When this file exists and its contents are equal to "Y", AppArmor
* is enabled. This is a little more reliable than using
* aa_is_enabled(2), which performs an additional check on securityfs
* that will fail in settings where securityfs isn't available
* (e.g. inside a container).
*/
fd = fopen("/sys/module/apparmor/parameters/enabled", "r");
if (fd == NULL)
debug_return_int(0);
ret = (fgetc(fd) == 'Y');
fclose(fd);
debug_return_int(ret);
}
/**
* @brief Prepare to transition into a new AppArmor profile.
*
* @param new_profile The AppArmor profile to transition into on the
* next exec.
*
* @return 0 on success, and a nonzero value on failure.
*/
int
apparmor_prepare(const char *new_profile)
{
int ret;
char *mode, *old_profile;
debug_decl(apparmor_prepare, SUDO_DEBUG_APPARMOR);
/* Determine the current AppArmor confinement status */
if ((ret = aa_getcon(&old_profile, &mode)) == -1) {
sudo_warn("%s", U_("failed to determine AppArmor confinement"));
old_profile = NULL;
goto done;
}
/* Tell AppArmor to transition into the new profile on the
* next exec */
if ((ret = aa_change_onexec(new_profile)) != 0) {
sudo_warn(U_("unable to change AppArmor profile to %s"), new_profile);
goto done;
}
if (mode == NULL) {
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: changing AppArmor profile: %s -> %s", __func__,
old_profile, new_profile ? new_profile : "?");
} else {
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: changing AppArmor profile: %s (%s) -> %s", __func__,
old_profile, mode, new_profile ? new_profile : "?");
}
done:
/*
* The profile string returned by aa_getcon must be free'd, while the
* mode string must _not_ be free'd.
*/
if (old_profile != NULL)
free(old_profile);
debug_return_int(ret);
}
#endif /* HAVE_APPARMOR */
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