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https://gitlab.com/cryptsetup/cryptsetup.git
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75e45462f0
We do not support switch while the crypto backend is already initialized, so it does not make sense to check repeatedly for the FIPS mode status.
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) 2011-2021 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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