crypto: api - Add fips_enable flag

Add the ability to turn FIPS-compliant mode on or off at boot

In order to be FIPS compliant, several check may need to be preformed that may
be construed as unusefull in a non-compliant mode.  This patch allows us to set
a kernel flag incating that we are running in a fips-compliant mode from boot
up.  It also exports that mode information to user space via a sysctl
(/proc/sys/crypto/fips_enabled).

Tested successfully by me.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Neil Horman 2008-08-05 14:13:08 +08:00 committed by Herbert Xu
parent 5be5e667a9
commit ccb778e184
5 changed files with 90 additions and 0 deletions

View file

@ -21,6 +21,14 @@ if CRYPTO
comment "Crypto core or helper"
config CRYPTO_FIPS
bool "FIPS 200 compliance"
help
This options enables the fips boot option which is
required if you want to system to operate in a FIPS 200
certification. You should say no unless you know what
this is.
config CRYPTO_ALGAPI
tristate
help

View file

@ -5,6 +5,8 @@
obj-$(CONFIG_CRYPTO) += crypto.o
crypto-objs := api.o cipher.o digest.o compress.o
obj-$(CONFIG_CRYPTO_FIPS) += fips.o
crypto_algapi-$(CONFIG_PROC_FS) += proc.o
crypto_algapi-objs := algapi.o scatterwalk.o $(crypto_algapi-y)
obj-$(CONFIG_CRYPTO_ALGAPI) += crypto_algapi.o

27
crypto/fips.c Normal file
View file

@ -0,0 +1,27 @@
/*
* FIPS 200 support.
*
* Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include "internal.h"
int fips_enabled;
EXPORT_SYMBOL_GPL(fips_enabled);
/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
static int fips_enable(char *str)
{
fips_enabled = !!simple_strtol(str, NULL, 0);
printk(KERN_INFO "fips mode: %s\n",
fips_enabled ? "enabled" : "disabled");
return 1;
}
__setup("fips=", fips_enable);

View file

@ -26,6 +26,12 @@
#include <linux/rwsem.h>
#include <linux/slab.h>
#ifdef CONFIG_CRYPTO_FIPS
extern int fips_enabled;
#else
#define fips_enabled 0
#endif
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,

View file

@ -19,8 +19,53 @@
#include <linux/rwsem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysctl.h>
#include "internal.h"
#ifdef CONFIG_CRYPTO_FIPS
static struct ctl_table crypto_sysctl_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "fips_enabled",
.data = &fips_enabled,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec
},
{
.ctl_name = 0,
},
};
static struct ctl_table crypto_dir_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "crypto",
.mode = 0555,
.child = crypto_sysctl_table
},
{
.ctl_name = 0,
},
};
static struct ctl_table_header *crypto_sysctls;
static void crypto_proc_fips_init(void)
{
crypto_sysctls = register_sysctl_table(crypto_dir_table);
}
static void crypto_proc_fips_exit(void)
{
if (crypto_sysctls)
unregister_sysctl_table(crypto_sysctls);
}
#else
#define crypto_proc_fips_init()
#define crypto_proc_fips_exit()
#endif
static void *c_start(struct seq_file *m, loff_t *pos)
{
down_read(&crypto_alg_sem);
@ -106,9 +151,11 @@ static const struct file_operations proc_crypto_ops = {
void __init crypto_init_proc(void)
{
proc_create("crypto", 0, NULL, &proc_crypto_ops);
crypto_proc_fips_init();
}
void __exit crypto_exit_proc(void)
{
crypto_proc_fips_exit();
remove_proc_entry("crypto", NULL);
}