crypto/fips.c

   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
  16 int fips_enabled;
  17 EXPORT_SYMBOL_GPL(fips_enabled);
  18
  19 ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
  20 EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
  21
  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);
  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
  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
  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
  83 subsys_initcall(fips_init);
  84 module_exit(fips_exit);