1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * FIPS 200 support.
4 *
5 * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
6 */
7
8#include <linux/export.h>
9#include <linux/fips.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/sysctl.h>
14#include <linux/notifier.h>
15#include <linux/string_choices.h>
16#include <generated/utsrelease.h>
17
18int fips_enabled;
19EXPORT_SYMBOL_GPL(fips_enabled);
20
21ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
22EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
23
24/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
25static int fips_enable(char *str)
26{
27 if (kstrtoint(s: str, base: 0, res: &fips_enabled))
28 return 0;
29
30 fips_enabled = !!fips_enabled;
31 pr_info("fips mode: %s\n", str_enabled_disabled(fips_enabled));
32 return 1;
33}
34
35__setup("fips=", fips_enable);
36
37#define FIPS_MODULE_NAME CONFIG_CRYPTO_FIPS_NAME
38#ifdef CONFIG_CRYPTO_FIPS_CUSTOM_VERSION
39#define FIPS_MODULE_VERSION CONFIG_CRYPTO_FIPS_VERSION
40#else
41#define FIPS_MODULE_VERSION UTS_RELEASE
42#endif
43
44static char fips_name[] = FIPS_MODULE_NAME;
45static char fips_version[] = FIPS_MODULE_VERSION;
46
47static const struct ctl_table crypto_sysctl_table[] = {
48 {
49 .procname = "fips_enabled",
50 .data = &fips_enabled,
51 .maxlen = sizeof(int),
52 .mode = 0444,
53 .proc_handler = proc_dointvec
54 },
55 {
56 .procname = "fips_name",
57 .data = &fips_name,
58 .maxlen = 64,
59 .mode = 0444,
60 .proc_handler = proc_dostring
61 },
62 {
63 .procname = "fips_version",
64 .data = &fips_version,
65 .maxlen = 64,
66 .mode = 0444,
67 .proc_handler = proc_dostring
68 },
69};
70
71static struct ctl_table_header *crypto_sysctls;
72
73static void crypto_proc_fips_init(void)
74{
75 crypto_sysctls = register_sysctl("crypto", crypto_sysctl_table);
76}
77
78static void crypto_proc_fips_exit(void)
79{
80 unregister_sysctl_table(table: crypto_sysctls);
81}
82
83void fips_fail_notify(void)
84{
85 if (fips_enabled)
86 atomic_notifier_call_chain(nh: &fips_fail_notif_chain, val: 0, NULL);
87}
88EXPORT_SYMBOL_GPL(fips_fail_notify);
89
90static int __init fips_init(void)
91{
92 crypto_proc_fips_init();
93 return 0;
94}
95
96static void __exit fips_exit(void)
97{
98 crypto_proc_fips_exit();
99}
100
101module_init(fips_init);
102module_exit(fips_exit);
103

source code of linux/crypto/fips.c