CIFS: Enable signing in SMB2
Use hmac-sha256 and rather than hmac-md5 that is used for CIFS/SMB.
Signature field in SMB2 header is 16 bytes instead of 8 bytes.
Automatically enable signing by client when requested by the server
when signing ability is available to the client.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 6a0d741..724738c 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -686,12 +686,17 @@
void
cifs_crypto_shash_release(struct TCP_Server_Info *server)
{
+ if (server->secmech.hmacsha256)
+ crypto_free_shash(server->secmech.hmacsha256);
+
if (server->secmech.md5)
crypto_free_shash(server->secmech.md5);
if (server->secmech.hmacmd5)
crypto_free_shash(server->secmech.hmacmd5);
+ kfree(server->secmech.sdeschmacsha256);
+
kfree(server->secmech.sdeschmacmd5);
kfree(server->secmech.sdescmd5);
@@ -716,6 +721,13 @@
goto crypto_allocate_md5_fail;
}
+ server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
+ if (IS_ERR(server->secmech.hmacsha256)) {
+ cERROR(1, "could not allocate crypto hmacsha256\n");
+ rc = PTR_ERR(server->secmech.hmacsha256);
+ goto crypto_allocate_hmacsha256_fail;
+ }
+
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.hmacmd5);
server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
@@ -727,7 +739,6 @@
server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
server->secmech.sdeschmacmd5->shash.flags = 0x0;
-
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.md5);
server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
@@ -739,12 +750,29 @@
server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
server->secmech.sdescmd5->shash.flags = 0x0;
+ size = sizeof(struct shash_desc) +
+ crypto_shash_descsize(server->secmech.hmacsha256);
+ server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
+ if (!server->secmech.sdeschmacsha256) {
+ cERROR(1, "%s: Can't alloc hmacsha256\n", __func__);
+ rc = -ENOMEM;
+ goto crypto_allocate_hmacsha256_sdesc_fail;
+ }
+ server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
+ server->secmech.sdeschmacsha256->shash.flags = 0x0;
+
return 0;
+crypto_allocate_hmacsha256_sdesc_fail:
+ kfree(server->secmech.sdescmd5);
+
crypto_allocate_md5_sdesc_fail:
kfree(server->secmech.sdeschmacmd5);
crypto_allocate_hmacmd5_sdesc_fail:
+ crypto_free_shash(server->secmech.hmacsha256);
+
+crypto_allocate_hmacsha256_fail:
crypto_free_shash(server->secmech.md5);
crypto_allocate_md5_fail: