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75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/* FIPS compliance status test for GNU/Linux systems.
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _FIPS_PRIVATE_H
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#define _FIPS_PRIVATE_H
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <not-cancel.h>
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#include <stdbool.h>
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/* Return true if FIPS mode is enabled. See
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sysdeps/generic/fips-private.h for more information. */
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static bool
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fips_enabled_p (void)
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{
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static enum
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{
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FIPS_UNTESTED = 0,
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FIPS_ENABLED = 1,
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FIPS_DISABLED = -1,
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FIPS_TEST_FAILED = -2
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} checked;
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if (checked == FIPS_UNTESTED)
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{
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int fd = __open_nocancel ("/proc/sys/crypto/fips_enabled", O_RDONLY);
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if (fd != -1)
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{
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/* This is more than enough, the file contains a single integer. */
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char buf[32];
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ssize_t n;
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n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, sizeof (buf) - 1));
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__close_nocancel_nostatus (fd);
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if (n > 0)
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{
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/* Terminate the string. */
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buf[n] = '\0';
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char *endp;
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long int res = strtol (buf, &endp, 10);
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if (endp != buf && (*endp == '\0' || *endp == '\n'))
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checked = (res > 0) ? FIPS_ENABLED : FIPS_DISABLED;
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}
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}
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if (checked == FIPS_UNTESTED)
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checked = FIPS_TEST_FAILED;
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}
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return checked == FIPS_ENABLED;
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}
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#endif /* _FIPS_PRIVATE_H */
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