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/* upstart
*
* apparmor.c - handle AppArmor profiles
*
* Copyright © 2013 Canonical Ltd.
* Author: Marc Deslauriers <marc.deslauriers@canonical.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <nih/signal.h>
#include <nih/string.h>
#include "apparmor.h"
/**
* apparmor_switch:
* @profile: AppArmor profile to switch to
*
* This function switches to a new AppArmor profile on exec
*
* Returns: zero on success, -1 on error
**/
int
apparmor_switch (char *profile)
{
nih_local char *filename = NULL;
FILE *f;
nih_assert (profile != NULL);
/* Silently fail if AppArmor isn't enabled. */
if (! apparmor_available())
return 0;
filename = nih_sprintf (NULL, "/proc/%d/attr/exec", getpid());
if (! filename)
return -1;
f = fopen (filename, "w");
if (! f)
return -1;
fprintf (f, "exec %s\n", profile);
if (fclose (f))
return -1;
return 0;
}
/**
* apparmor_available:
*
* This function checks to see if AppArmor is available and enabled
*
* Returns: TRUE if AppArmor is available, FALSE if it isn't
**/
int
apparmor_available (void)
{
struct stat statbuf;
FILE *f;
int value = 0;
/* Do not load if AppArmor is disabled.
*/
f = fopen ("/sys/module/apparmor/parameters/enabled", "r");
if (! f)
return FALSE;
value = fgetc (f);
if (fclose (f))
return FALSE;
if (value != 'Y')
return FALSE;
/* Do not load if AppArmor parser isn't available.
*/
if (stat (APPARMOR_PARSER, &statbuf) == 0) {
if(! (S_ISREG(statbuf.st_mode) && statbuf.st_mode & S_IXUSR))
return FALSE;
} else {
return FALSE;
}
/* Do not load if running in a container.
* This is a distro-specific patch.
*/
if (stat ("/run/container_type", &statbuf) == 0)
return FALSE;
/* Do not load if running in a Ubuntu live CD.
* This is a distro-specific patch.
*/
if (stat ("/rofs/etc/apparmor.d", &statbuf) == 0)
return FALSE;
return TRUE;
}
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