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https://gitlab.com/cryptsetup/cryptsetup.git
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56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* FIPS mode utilities
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*
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* Copyright (C) 2011-2022 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "utils_fips.h"
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#if !ENABLE_FIPS
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bool crypt_fips_mode(void) { return false; }
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#else
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static bool fips_checked = false;
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static bool fips_mode = false;
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static bool kernel_fips_mode(void)
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{
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int fd;
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char buf[1] = "";
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if ((fd = open("/proc/sys/crypto/fips_enabled", O_RDONLY)) >= 0) {
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while (read(fd, buf, sizeof(buf)) < 0 && errno == EINTR);
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close(fd);
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}
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return (buf[0] == '1');
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}
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bool crypt_fips_mode(void)
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{
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if (fips_checked)
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return fips_mode;
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fips_mode = kernel_fips_mode() && !access("/etc/system-fips", F_OK);
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fips_checked = true;
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return fips_mode;
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}
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#endif /* ENABLE_FIPS */
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