From: Chuck Lever <chuck.lever@xxxxxxxxxx>
Now that all consumers of the KRB5_SUPPORTED_ENCTYPES macro are
within the SunRPC layer, the macro can be replaced with something
private and more flexible.
Tested-by: Scott Mayhew <smayhew@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/gss_krb5_enctypes.h | 41 ------------------------------
net/sunrpc/auth_gss/gss_krb5_mech.c | 41 +++++++++++++++++++++++++++++-
2 files changed, 39 insertions(+), 43 deletions(-)
delete mode 100644 include/linux/sunrpc/gss_krb5_enctypes.h
diff --git a/include/linux/sunrpc/gss_krb5_enctypes.h b/include/linux/sunrpc/gss_krb5_enctypes.h
deleted file mode 100644
index 87eea679d750..000000000000
--- a/include/linux/sunrpc/gss_krb5_enctypes.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Define the string that exports the set of kernel-supported
- * Kerberos enctypes. This list is sent via upcall to gssd, and
- * is also exposed via the nfsd /proc API. The consumers generally
- * treat this as an ordered list, where the first item in the list
- * is the most preferred.
- */
-
-#ifndef _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H
-#define _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H
-
-#ifdef CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES
-
-/*
- * NB: This list includes DES3_CBC_SHA1, which was deprecated by RFC 8429.
- *
- * ENCTYPE_AES256_CTS_HMAC_SHA1_96
- * ENCTYPE_AES128_CTS_HMAC_SHA1_96
- * ENCTYPE_DES3_CBC_SHA1
- */
-#define KRB5_SUPPORTED_ENCTYPES "18,17,16"
-
-#else /* CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES */
-
-/*
- * NB: This list includes encryption types that were deprecated
- * by RFC 8429 and RFC 6649.
- *
- * ENCTYPE_AES256_CTS_HMAC_SHA1_96
- * ENCTYPE_AES128_CTS_HMAC_SHA1_96
- * ENCTYPE_DES3_CBC_SHA1
- * ENCTYPE_DES_CBC_MD5
- * ENCTYPE_DES_CBC_CRC
- * ENCTYPE_DES_CBC_MD4
- */
-#define KRB5_SUPPORTED_ENCTYPES "18,17,16,3,1,2"
-
-#endif /* CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES */
-
-#endif /* _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H */
diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
index e33575216a01..2553d18fd288 100644
--- a/net/sunrpc/auth_gss/gss_krb5_mech.c
+++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -19,7 +19,6 @@
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/gss_krb5.h>
#include <linux/sunrpc/xdr.h>
-#include <linux/sunrpc/gss_krb5_enctypes.h>
#include "auth_gss_internal.h"
#include "gss_krb5_internal.h"
@@ -145,6 +144,43 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
},
};
+/*
+ * The list of advertised enctypes is specified in order of most
+ * preferred to least.
+ */
+static char gss_krb5_enctype_priority_list[64];
+
+static void gss_krb5_prepare_enctype_priority_list(void)
+{
+ static const u32 gss_krb5_enctypes[] = {
+ ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+ ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+ ENCTYPE_DES3_CBC_SHA1,
+#ifndef CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES
+ ENCTYPE_DES_CBC_MD5,
+ ENCTYPE_DES_CBC_CRC,
+ ENCTYPE_DES_CBC_MD4,
+#endif
+ };
+ size_t total, i;
+ char buf[16];
+ char *sep;
+ int n;
+
+ sep = "";
+ gss_krb5_enctype_priority_list[0] = '\0';
+ for (total = 0, i = 0; i < ARRAY_SIZE(gss_krb5_enctypes); i++) {
+ n = sprintf(buf, "%s%u", sep, gss_krb5_enctypes[i]);
+ if (n < 0)
+ break;
+ if (total + n >= sizeof(gss_krb5_enctype_priority_list))
+ break;
+ strcat(gss_krb5_enctype_priority_list, buf);
+ sep = ",";
+ total += n;
+ }
+}
+
static const int num_supported_enctypes =
ARRAY_SIZE(supported_gss_krb5_enctypes);
@@ -761,13 +797,14 @@ static struct gss_api_mech gss_kerberos_mech = {
.gm_ops = &gss_kerberos_ops,
.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
.gm_pfs = gss_kerberos_pfs,
- .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
+ .gm_upcall_enctypes = gss_krb5_enctype_priority_list,
};
static int __init init_kerberos_module(void)
{
int status;
+ gss_krb5_prepare_enctype_priority_list();
status = gss_mech_register(&gss_kerberos_mech);
if (status)
printk("Failed to register kerberos gss mechanism!\n");
