Add the ability to turn FIPS-compliant mode on or off at boot
In order to be FIPS compliant, several check may need to be preformed that may
be construed as unusefull in a non-compliant mode. This patch allows us to set
a kernel flag incating that we are running in a fips-compliant mode from boot
up. It also exports that mode information to user space via a sysctl
(/proc/sys/crypto/fips_enabled).
Tested successfully by me.
Neil
Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
api.c | 14 ++++++++++++++
internal.h | 2 ++
proc.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 48 insertions(+)
diff --git a/crypto/api.c b/crypto/api.c
index d06e332..897070c 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -450,5 +450,19 @@ int crypto_has_alg(const char *name, u32 type, u32 mask)
}
EXPORT_SYMBOL_GPL(crypto_has_alg);
+
+int fips_enabled;
+
+/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
+static int fips_enable(char *str)
+{
+ fips_enabled = !!simple_strtol(str, NULL, 0);
+ printk(KERN_INFO "fips mode: %s\n",
+ fips_enabled ? "enabled" : "disabled");
+ return 1;
+}
+
+__setup("fips=", fips_enable);
+
MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");
diff --git a/crypto/internal.h b/crypto/internal.h
index 683fcb2..ec44f47 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -26,6 +26,8 @@
#include <linux/rwsem.h>
#include <linux/slab.h>
+extern int fips_enabled;
+
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,
diff --git a/crypto/proc.c b/crypto/proc.c
index 02ff567..07864ec 100644
--- a/crypto/proc.c
+++ b/crypto/proc.c
@@ -19,8 +19,37 @@
#include <linux/rwsem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/sysctl.h>
#include "internal.h"
+static struct ctl_table crypto_sysctl_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "fips_enabled",
+ .data = &fips_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec
+ },
+ {
+ .ctl_name = 0,
+ },
+};
+
+static struct ctl_table crypto_dir_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "crypto",
+ .mode = 0555,
+ .child = crypto_sysctl_table
+ },
+ {
+ .ctl_name = 0,
+ },
+};
+
+static struct ctl_table_header *crypto_sysctls;
+
static void *c_start(struct seq_file *m, loff_t *pos)
{
down_read(&crypto_alg_sem);
@@ -100,9 +129,12 @@ static const struct file_operations proc_crypto_ops = {
void __init crypto_init_proc(void)
{
proc_create("crypto", 0, NULL, &proc_crypto_ops);
+ crypto_sysctls = register_sysctl_table(crypto_dir_table);
}
void __exit crypto_exit_proc(void)
{
remove_proc_entry("crypto", NULL);
+ if (crypto_sysctls)
+ unregister_sysctl_table(crypto_sysctls);
}
--
/****************************************************
* Neil Horman <nhorman@xxxxxxxxxxxxx>
* Software Engineer, Red Hat
****************************************************/
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