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 */
fips_enable(char * str)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 
69 static struct ctl_table crypto_dir_table[] = {
70 	{
71 		.procname       = "crypto",
72 		.mode           = 0555,
73 		.child          = crypto_sysctl_table
74 	},
75 	{}
76 };
77 
78 static struct ctl_table_header *crypto_sysctls;
79 
crypto_proc_fips_init(void)80 static void crypto_proc_fips_init(void)
81 {
82 	crypto_sysctls = register_sysctl_table(crypto_dir_table);
83 }
84 
crypto_proc_fips_exit(void)85 static void crypto_proc_fips_exit(void)
86 {
87 	unregister_sysctl_table(crypto_sysctls);
88 }
89 
fips_fail_notify(void)90 void fips_fail_notify(void)
91 {
92 	if (fips_enabled)
93 		atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
94 }
95 EXPORT_SYMBOL_GPL(fips_fail_notify);
96 
fips_init(void)97 static int __init fips_init(void)
98 {
99 	crypto_proc_fips_init();
100 	return 0;
101 }
102 
fips_exit(void)103 static void __exit fips_exit(void)
104 {
105 	crypto_proc_fips_exit();
106 }
107 
108 subsys_initcall(fips_init);
109 module_exit(fips_exit);
110