@@ -71,6 +71,7 @@ bool enable_oplocks = true;
bool linuxExtEnabled = true;
bool lookupCacheEnabled = true;
bool disable_legacy_dialects; /* false by default */
+bool enable_gcm_256; /* false by default, change when more servers support it */
bool require_gcm_256; /* false by default */
unsigned int global_secflags = CIFSSEC_DEF;
/* unsigned int ntlmv2_support = 0; */
@@ -105,6 +106,9 @@ MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
module_param(enable_oplocks, bool, 0644);
MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
+module_param(enable_gcm_256, bool, 0644);
+MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
+
module_param(require_gcm_256, bool, 0644);
MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
@@ -1956,6 +1956,7 @@ extern bool lookupCacheEnabled;
extern unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
+extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
@@ -564,6 +564,12 @@ build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
pneg_ctxt->CipherCount = cpu_to_le16(1);
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
+ } else if (enable_gcm_256) {
+ pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
+ pneg_ctxt->CipherCount = cpu_to_le16(3);
+ pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
+ pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
+ pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
} else {
pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
pneg_ctxt->CipherCount = cpu_to_le16(2);
@@ -342,8 +342,9 @@ struct smb2_encryption_neg_context {
__le16 ContextType; /* 2 */
__le16 DataLength;
__le32 Reserved;
- __le16 CipherCount; /* AES-128-GCM and AES-128-CCM */
- __le16 Ciphers[2];
+ /* CipherCount usally 2, but can be 3 when AES256-GCM enabled */
+ __le16 CipherCount; /* AES128-GCM and AES128-CCM by default */
+ __le16 Ciphers[3];
} __packed;
/* See MS-SMB2 2.2.3.1.3 */