CIFS: add sha512 secmech

* prepare for SMB3.11 pre-auth integrity
* enable sha512 when SMB311 is enabled in Kconfig
* add sha512 as a soft dependency

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>

diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 687da62..e901ef6 100644 (file)
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -189,6 +189,7 @@ config CIFS_NFSD_EXPORT
 config CIFS_SMB311
        bool "SMB3.1.1 network file system support (Experimental)"
        depends on CIFS
+       select CRYPTO_SHA512
 
        help
          This enables experimental support for the newest, SMB3.1.1, dialect.

diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 478a145..6fa6d45 100644 (file)
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -829,6 +829,11 @@ cifs_crypto_secmech_release(struct TCP_Server_Info *server)
                server->secmech.md5 = NULL;
        }
 
+       if (server->secmech.md5) {
+               crypto_free_shash(server->secmech.sha512);
+               server->secmech.sha512 = NULL;
+       }
+
        if (server->secmech.hmacmd5) {
                crypto_free_shash(server->secmech.hmacmd5);
                server->secmech.hmacmd5 = NULL;
@@ -852,4 +857,6 @@ cifs_crypto_secmech_release(struct TCP_Server_Info *server)
        server->secmech.sdeschmacmd5 = NULL;
        kfree(server->secmech.sdescmd5);
        server->secmech.sdescmd5 = NULL;
+       kfree(server->secmech.sdescsha512);
+       server->secmech.sdescsha512 = NULL;
 }

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 32cdea6..f715609 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1486,6 +1486,7 @@ MODULE_SOFTDEP("pre: nls");
 MODULE_SOFTDEP("pre: aes");
 MODULE_SOFTDEP("pre: cmac");
 MODULE_SOFTDEP("pre: sha256");
+MODULE_SOFTDEP("pre: sha512");
 MODULE_SOFTDEP("pre: aead2");
 MODULE_SOFTDEP("pre: ccm");
 module_init(init_cifs)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 48f7c19..765fc2c 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -130,10 +130,12 @@ struct cifs_secmech {
        struct crypto_shash *md5; /* md5 hash function */
        struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
        struct crypto_shash *cmacaes; /* block-cipher based MAC function */
+       struct crypto_shash *sha512; /* sha512 hash function */
        struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
        struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
        struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
        struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
+       struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
        struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
        struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
 };

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 05287b0..3b8e9c2 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -202,4 +202,7 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
 
 extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
                                        enum securityEnum);
+#ifdef CONFIG_CIFS_SMB311
+extern int smb311_crypto_shash_allocate(struct TCP_Server_Info *server);
+#endif
 #endif                 /* _SMB2PROTO_H */

diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index c3c271f..bf49cb7 100644 (file)
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -70,6 +70,36 @@ err:
        return rc;
 }
 
+#ifdef CONFIG_CIFS_SMB311
+int
+smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
+{
+       struct cifs_secmech *p = &server->secmech;
+       int rc = 0;
+
+       rc = cifs_alloc_hash("hmac(sha256)",
+                            &p->hmacsha256,
+                            &p->sdeschmacsha256);
+       if (rc)
+               return rc;
+
+       rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
+       if (rc)
+               goto err;
+
+       rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
+       if (rc)
+               goto err;
+
+       return 0;
+
+err:
+       cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
+       cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
+       return rc;
+}
+#endif
+
 static struct cifs_ses *
 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
 {