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 <generated/utsrelease.h>
16
17 int fips_enabled;
18 EXPORT_SYMBOL_GPL(fips_enabled);
19
20 ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
21 EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
22
23 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
24 static int fips_enable(char *str)
25 {
26 fips_enabled = !!simple_strtol(str, NULL, 0);
27 printk(KERN_INFO "fips mode: %s\n",
28 fips_enabled ? "enabled" : "disabled");
29 return 1;
30 }
31
32 __setup("fips=", fips_enable);
33
34 #define FIPS_MODULE_NAME CONFIG_CRYPTO_FIPS_NAME
35 #ifdef CONFIG_CRYPTO_FIPS_CUSTOM_VERSION
36 #define FIPS_MODULE_VERSION CONFIG_CRYPTO_FIPS_VERSION
37 #else
38 #define FIPS_MODULE_VERSION UTS_RELEASE
39 #endif
40
41 static char fips_name[] = FIPS_MODULE_NAME;
42 static char fips_version[] = FIPS_MODULE_VERSION;
43
44 static struct ctl_table crypto_sysctl_table[] = {
45 {
46 .procname = "fips_enabled",
47 .data = &fips_enabled,
48 .maxlen = sizeof(int),
49 .mode = 0444,
50 .proc_handler = proc_dointvec
51 },
52 {
53 .procname = "fips_name",
54 .data = &fips_name,
55 .maxlen = 64,
56 .mode = 0444,
57 .proc_handler = proc_dostring
58 },
59 {
60 .procname = "fips_version",
61 .data = &fips_version,
62 .maxlen = 64,
63 .mode = 0444,
64 .proc_handler = proc_dostring
65 },
66 };
67
68 static struct ctl_table_header *crypto_sysctls;
69
70 static void crypto_proc_fips_init(void)
71 {
72 crypto_sysctls = register_sysctl("crypto", crypto_sysctl_table);
73 }
74
75 static void crypto_proc_fips_exit(void)
76 {
77 unregister_sysctl_table(crypto_sysctls);
78 }
79
80 void fips_fail_notify(void)
81 {
82 if (fips_enabled)
83 atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
84 }
85 EXPORT_SYMBOL_GPL(fips_fail_notify);
86
87 static int __init fips_init(void)
88 {
89 crypto_proc_fips_init();
90 return 0;
91 }
92
93 static void __exit fips_exit(void)
94 {
95 crypto_proc_fips_exit();
96 }
97
98 subsys_initcall(fips_init);
99 module_exit(fips_exit);
100
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