Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Neil Horman | ccb778e | 2008-08-05 14:13:08 +0800 | [diff] [blame] | 2 | /* |
| 3 | * FIPS 200 support. |
| 4 | * |
| 5 | * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com> |
Neil Horman | ccb778e | 2008-08-05 14:13:08 +0800 | [diff] [blame] | 6 | */ |
| 7 | |
Herbert Xu | 76450f9 | 2015-04-22 13:25:54 +0800 | [diff] [blame] | 8 | #include <linux/export.h> |
| 9 | #include <linux/fips.h> |
| 10 | #include <linux/init.h> |
Herbert Xu | 94072cb | 2015-04-22 13:25:56 +0800 | [diff] [blame] | 11 | #include <linux/module.h> |
Herbert Xu | 76450f9 | 2015-04-22 13:25:54 +0800 | [diff] [blame] | 12 | #include <linux/kernel.h> |
Herbert Xu | 94072cb | 2015-04-22 13:25:56 +0800 | [diff] [blame] | 13 | #include <linux/sysctl.h> |
Gilad Ben-Yossef | 9552389 | 2019-07-02 14:39:20 +0300 | [diff] [blame^] | 14 | #include <linux/notifier.h> |
Neil Horman | ccb778e | 2008-08-05 14:13:08 +0800 | [diff] [blame] | 15 | |
| 16 | int fips_enabled; |
| 17 | EXPORT_SYMBOL_GPL(fips_enabled); |
| 18 | |
Gilad Ben-Yossef | 9552389 | 2019-07-02 14:39:20 +0300 | [diff] [blame^] | 19 | ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain); |
| 20 | EXPORT_SYMBOL_GPL(fips_fail_notif_chain); |
| 21 | |
Neil Horman | ccb778e | 2008-08-05 14:13:08 +0800 | [diff] [blame] | 22 | /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */ |
| 23 | static int fips_enable(char *str) |
| 24 | { |
| 25 | fips_enabled = !!simple_strtol(str, NULL, 0); |
| 26 | printk(KERN_INFO "fips mode: %s\n", |
| 27 | fips_enabled ? "enabled" : "disabled"); |
| 28 | return 1; |
| 29 | } |
| 30 | |
| 31 | __setup("fips=", fips_enable); |
Herbert Xu | 94072cb | 2015-04-22 13:25:56 +0800 | [diff] [blame] | 32 | |
| 33 | static struct ctl_table crypto_sysctl_table[] = { |
| 34 | { |
| 35 | .procname = "fips_enabled", |
| 36 | .data = &fips_enabled, |
| 37 | .maxlen = sizeof(int), |
| 38 | .mode = 0444, |
| 39 | .proc_handler = proc_dointvec |
| 40 | }, |
| 41 | {} |
| 42 | }; |
| 43 | |
| 44 | static struct ctl_table crypto_dir_table[] = { |
| 45 | { |
| 46 | .procname = "crypto", |
| 47 | .mode = 0555, |
| 48 | .child = crypto_sysctl_table |
| 49 | }, |
| 50 | {} |
| 51 | }; |
| 52 | |
| 53 | static struct ctl_table_header *crypto_sysctls; |
| 54 | |
| 55 | static void crypto_proc_fips_init(void) |
| 56 | { |
| 57 | crypto_sysctls = register_sysctl_table(crypto_dir_table); |
| 58 | } |
| 59 | |
| 60 | static void crypto_proc_fips_exit(void) |
| 61 | { |
| 62 | unregister_sysctl_table(crypto_sysctls); |
| 63 | } |
| 64 | |
Gilad Ben-Yossef | 9552389 | 2019-07-02 14:39:20 +0300 | [diff] [blame^] | 65 | void fips_fail_notify(void) |
| 66 | { |
| 67 | if (fips_enabled) |
| 68 | atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL); |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(fips_fail_notify); |
| 71 | |
Herbert Xu | 94072cb | 2015-04-22 13:25:56 +0800 | [diff] [blame] | 72 | static int __init fips_init(void) |
| 73 | { |
| 74 | crypto_proc_fips_init(); |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static void __exit fips_exit(void) |
| 79 | { |
| 80 | crypto_proc_fips_exit(); |
| 81 | } |
| 82 | |
Eric Biggers | c4741b2 | 2019-04-11 21:57:42 -0700 | [diff] [blame] | 83 | subsys_initcall(fips_init); |
Herbert Xu | 94072cb | 2015-04-22 13:25:56 +0800 | [diff] [blame] | 84 | module_exit(fips_exit); |