the-tree/crypto/fips.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * FIPS 200 support.
0004  *
0005  * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
0006  */
0007
0008 #include <linux/export.h>
0009 #include <linux/fips.h>
0010 #include <linux/init.h>
0011 #include <linux/module.h>
0012 #include <linux/kernel.h>
0013 #include <linux/sysctl.h>
0014 #include <linux/notifier.h>
0015 #include <generated/utsrelease.h>
0016
0017 int fips_enabled;
0018 EXPORT_SYMBOL_GPL(fips_enabled);
0019
0020 ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
0021 EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
0022
0023 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
0024 static int fips_enable(char *str)
0025 {
0026     fips_enabled = !!simple_strtol(str, NULL, 0);
0027     printk(KERN_INFO "fips mode: %s\n",
0028         fips_enabled ? "enabled" : "disabled");
0029     return 1;
0030 }
0031
0032 __setup("fips=", fips_enable);
0033
0034 #define FIPS_MODULE_NAME CONFIG_CRYPTO_FIPS_NAME
0035 #ifdef CONFIG_CRYPTO_FIPS_CUSTOM_VERSION
0036 #define FIPS_MODULE_VERSION CONFIG_CRYPTO_FIPS_VERSION
0037 #else
0038 #define FIPS_MODULE_VERSION UTS_RELEASE
0039 #endif
0040
0041 static char fips_name[] = FIPS_MODULE_NAME;
0042 static char fips_version[] = FIPS_MODULE_VERSION;
0043
0044 static struct ctl_table crypto_sysctl_table[] = {
0045     {
0046         .procname   = "fips_enabled",
0047         .data       = &fips_enabled,
0048         .maxlen     = sizeof(int),
0049         .mode       = 0444,
0050         .proc_handler   = proc_dointvec
0051     },
0052     {
0053         .procname   = "fips_name",
0054         .data       = &fips_name,
0055         .maxlen     = 64,
0056         .mode       = 0444,
0057         .proc_handler   = proc_dostring
0058     },
0059     {
0060         .procname   = "fips_version",
0061         .data       = &fips_version,
0062         .maxlen     = 64,
0063         .mode       = 0444,
0064         .proc_handler   = proc_dostring
0065     },
0066     {}
0067 };
0068
0069 static struct ctl_table crypto_dir_table[] = {
0070     {
0071         .procname       = "crypto",
0072         .mode           = 0555,
0073         .child          = crypto_sysctl_table
0074     },
0075     {}
0076 };
0077
0078 static struct ctl_table_header *crypto_sysctls;
0079
0080 static void crypto_proc_fips_init(void)
0081 {
0082     crypto_sysctls = register_sysctl_table(crypto_dir_table);
0083 }
0084
0085 static void crypto_proc_fips_exit(void)
0086 {
0087     unregister_sysctl_table(crypto_sysctls);
0088 }
0089
0090 void fips_fail_notify(void)
0091 {
0092     if (fips_enabled)
0093         atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
0094 }
0095 EXPORT_SYMBOL_GPL(fips_fail_notify);
0096
0097 static int __init fips_init(void)
0098 {
0099     crypto_proc_fips_init();
0100     return 0;
0101 }
0102
0103 static void __exit fips_exit(void)
0104 {
0105     crypto_proc_fips_exit();
0106 }
0107
0108 subsys_initcall(fips_init);
0109 module_exit(fips_exit);