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Update negotiate protocol for SMB3.11 dialect 

Send negotiate contexts when SMB3.11 dialect is negotiated
(ie the preauth and the encryption contexts) and
Initialize SMB3.11 preauth negotiate context salt to random bytes

Followon patch will update session setup and tree connect

Signed-off-by: Steve French <steve.french@primarydata.com>
This commit is contained in:
Steve French 2015-06-18 04:49:47 -05:00 committed by Steve French
parent b3152e2c7a
commit ebb3a9d4ba
2 changed files with 60 additions and 5 deletions
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59
fs/cifs/smb2pdu.c
View File

@ -304,6 +304,59 @@ small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
return rc;
}
#ifdef CONFIG_CIFS_SMB311
/* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
#define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) - 4 */
#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
#define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(38);
pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
}
static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(6);
pneg_ctxt->CipherCount = cpu_to_le16(2);
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
}
static void
assemble_neg_contexts(struct smb2_negotiate_req *req)
{
/* +4 is to account for the RFC1001 len field */
char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
/* Add 2 to size to round to 8 byte boundary */
pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
req->NegotiateContextCount = cpu_to_le16(2);
inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
+ sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
}
#else
static void assemble_neg_contexts(struct smb2_negotiate_req *req)
{
return;
}
#endif /* SMB311 */
/*
*
* SMB2 Worker functions follow:
@ -363,10 +416,12 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
/* ClientGUID must be zero for SMB2.02 dialect */
if (ses->server->vals->protocol_id == SMB20_PROT_ID)
memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
else
else {
memcpy(req->ClientGUID, server->client_guid,
SMB2_CLIENT_GUID_SIZE);
if (ses->server->vals->protocol_id == SMB311_PROT_ID)
assemble_neg_contexts(req);
}
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;

6
fs/cifs/smb2pdu.h
View File

@ -220,7 +220,7 @@ struct smb2_negotiate_req {
#define SMB311_SALT_SIZE 32
/* Hash Algorithm Types */
#define SMB2_PREAUTH_INTEGRITY_SHA512 0x0001
#define SMB2_PREAUTH_INTEGRITY_SHA512 cpu_to_le16(0x0001)
struct smb2_preauth_neg_context {
__le16 ContextType; /* 1 */
@ -240,8 +240,8 @@ struct smb2_encryption_neg_context {
__le16 ContextType; /* 2 */
__le16 DataLength;
__le32 Reserved;
__le16 CipherCount; /* 1 for time being, only AES-128-CCM */
__le16 Ciphers; /* Ciphers[0] since only one used now */
__le16 CipherCount; /* AES-128-GCM and AES-128-CCM */
__le16 Ciphers[2]; /* Ciphers[0] since only one used now */
} __packed;
struct smb2_negotiate_rsp {