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/* FIPS compliance status test for GNU/Linux systems.
Copyright (C) 2012-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _FIPS_PRIVATE_H
#define _FIPS_PRIVATE_H
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <not-cancel.h>
#include <stdbool.h>
/* Return true if FIPS mode is enabled. See
sysdeps/generic/fips-private.h for more information. */
static bool
fips_enabled_p (void)
{
static enum
{
FIPS_UNTESTED = 0,
FIPS_ENABLED = 1,
FIPS_DISABLED = -1,
FIPS_TEST_FAILED = -2
} checked;
if (checked == FIPS_UNTESTED)
{
int fd = __open_nocancel ("/proc/sys/crypto/fips_enabled", O_RDONLY);
if (fd != -1)
{
/* This is more than enough, the file contains a single integer. */
char buf[32];
ssize_t n;
n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, sizeof (buf) - 1));
__close_nocancel_nostatus (fd);
if (n > 0)
{
/* Terminate the string. */
buf[n] = '\0';
char *endp;
long int res = strtol (buf, &endp, 10);
if (endp != buf && (*endp == '\0' || *endp == '\n'))
checked = (res > 0) ? FIPS_ENABLED : FIPS_DISABLED;
}
}
if (checked == FIPS_UNTESTED)
checked = FIPS_TEST_FAILED;
}
return checked == FIPS_ENABLED;
}
#endif /* _FIPS_PRIVATE_H */
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