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* crypt/crypt-entry.c: Include fips-private.h.

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(__crypt_r, __crypt): Disable MD5 and DES if FIPS is enabled.
* crypt/md5c-test.c (main): Tolerate disabled MD5.
* sysdeps/unix/sysv/linux/fips-private.h: New file.
* sysdeps/generic/fips-private.h: New file, dummy fallback.
This commit is contained in:
Alexandre Oliva 2012-10-10 07:05:46 -03:00
parent 4ba74a3573
commit e745142509
5 changed files with 143 additions and 4 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2012-10-10 Alexandre Oliva <aoliva@redhat.com>
* crypt/crypt-entry.c: Include fips-private.h.
(__crypt_r, __crypt): Disable MD5 and DES if FIPS is enabled.
* crypt/md5c-test.c (main): Tolerate disabled MD5.
* sysdeps/unix/sysv/linux/fips-private.h: New file.
* sysdeps/generic/fips-private.h: New file, dummy fallback.
2012-10-10 Alexandre Oliva <aoliva@redhat.com>
* crypt/crypt-private.h: Include stdbool.h.

24
crypt/crypt-entry.c
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@ -28,6 +28,7 @@
#endif
#include <string.h>
#include <errno.h>
#include <fips-private.h>
#ifndef STATIC
#define STATIC static
@ -92,8 +93,16 @@ __crypt_r (key, salt, data)
#ifdef _LIBC
/* Try to find out whether we have to use MD5 encryption replacement. */
if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
return __md5_crypt_r (key, salt, (char *) data,
sizeof (struct crypt_data));
{
/* FIPS rules out MD5 password encryption. */
if (fips_enabled_p ())
{
__set_errno (EPERM);
return NULL;
}
return __md5_crypt_r (key, salt, (char *) data,
sizeof (struct crypt_data));
}
/* Try to find out whether we have to use SHA256 encryption replacement. */
if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
@ -115,6 +124,13 @@ __crypt_r (key, salt, data)
return NULL;
}
/* FIPS rules out DES password encryption. */
if (fips_enabled_p ())
{
__set_errno (EPERM);
return NULL;
}
/*
* Setup key schedule
*/
@ -148,7 +164,9 @@ crypt (key, salt)
{
#ifdef _LIBC
/* Try to find out whether we have to use MD5 encryption replacement. */
if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0
/* Let __crypt_r deal with the error code if FIPS is enabled. */
&& !fips_enabled_p ())
return __md5_crypt (key, salt);
/* Try to find out whether we have to use SHA256 encryption replacement. */

5
crypt/md5c-test.c
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@ -9,7 +9,10 @@ main (int argc, char *argv[])
int result = 0;
cp = crypt ("Hello world!", salt);
result |= strcmp ("$1$saltstri$YMyguxXMBpd2TEZ.vS/3q1", cp);
/* MD5 is disabled in FIPS mode. */
if (cp)
result |= strcmp ("$1$saltstri$YMyguxXMBpd2TEZ.vS/3q1", cp);
return result;
}

36
sysdeps/generic/fips-private.h Normal file
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@ -0,0 +1,36 @@
/* Dummy implementation of FIPS compliance status test.
Copyright (C) 2012 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
<http://www.gnu.org/licenses/>. */
#ifndef _FIPS_PRIVATE_H
#define _FIPS_PRIVATE_H
#include <stdbool.h>
/* Return true if compliance with the FIPS security standards is
enabled.
This is only relevant within crypt, to tell whether MD5 and DES
algorithms should be rejected. */
static inline bool
fips_enabled_p (void)
{
return false;
}
#endif /* _FIPS_PRIVATE_H */

74
sysdeps/unix/sysv/linux/fips-private.h Normal file
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@ -0,0 +1,74 @@
/* FIPS compliance status test for GNU/Linux systems.
Copyright (C) 2012 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
<http://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 inline 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_not_cancel_2 ("/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_not_cancel (fd, buf, sizeof (buf) - 1));
close_not_cancel_no_status (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 */