CIFS: Add session setup/logoff capability for SMB2
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 719e4c4..2165f0d 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -328,3 +328,224 @@
free_rsp_buf(resp_buftype, rsp);
return rc;
}
+
+int
+SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
+ const struct nls_table *nls_cp)
+{
+ struct smb2_sess_setup_req *req;
+ struct smb2_sess_setup_rsp *rsp = NULL;
+ struct kvec iov[2];
+ int rc = 0;
+ int resp_buftype;
+ __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
+ struct TCP_Server_Info *server;
+ unsigned int sec_flags;
+ u8 temp = 0;
+ u16 blob_length = 0;
+ char *security_blob;
+ char *ntlmssp_blob = NULL;
+ bool use_spnego = false; /* else use raw ntlmssp */
+
+ cFYI(1, "Session Setup");
+
+ if (ses->server)
+ server = ses->server;
+ else {
+ rc = -EIO;
+ return rc;
+ }
+
+ /*
+ * If memory allocation is successful, caller of this function
+ * frees it.
+ */
+ ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
+ if (!ses->ntlmssp)
+ return -ENOMEM;
+
+ ses->server->secType = RawNTLMSSP;
+
+ssetup_ntlmssp_authenticate:
+ if (phase == NtLmChallenge)
+ phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
+
+ rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
+ if (rc)
+ return rc;
+
+ /* if any of auth flags (ie not sign or seal) are overriden use them */
+ if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
+ sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
+ else /* if override flags set only sign/seal OR them with global auth */
+ sec_flags = global_secflags | ses->overrideSecFlg;
+
+ cFYI(1, "sec_flags 0x%x", sec_flags);
+
+ req->hdr.SessionId = 0; /* First session, not a reauthenticate */
+ req->VcNumber = 0; /* MBZ */
+ /* to enable echos and oplocks */
+ req->hdr.CreditRequest = cpu_to_le16(3);
+
+ /* only one of SMB2 signing flags may be set in SMB2 request */
+ if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
+ temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
+ else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
+ temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
+ else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
+ temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
+
+ req->SecurityMode = temp;
+ req->Capabilities = 0;
+ req->Channel = 0; /* MBZ */
+
+ iov[0].iov_base = (char *)req;
+ /* 4 for rfc1002 length field and 1 for pad */
+ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
+ if (phase == NtLmNegotiate) {
+ ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
+ GFP_KERNEL);
+ if (ntlmssp_blob == NULL) {
+ rc = -ENOMEM;
+ goto ssetup_exit;
+ }
+ build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
+ if (use_spnego) {
+ /* blob_length = build_spnego_ntlmssp_blob(
+ &security_blob,
+ sizeof(struct _NEGOTIATE_MESSAGE),
+ ntlmssp_blob); */
+ /* BB eventually need to add this */
+ cERROR(1, "spnego not supported for SMB2 yet");
+ rc = -EOPNOTSUPP;
+ kfree(ntlmssp_blob);
+ goto ssetup_exit;
+ } else {
+ blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
+ /* with raw NTLMSSP we don't encapsulate in SPNEGO */
+ security_blob = ntlmssp_blob;
+ }
+ } else if (phase == NtLmAuthenticate) {
+ req->hdr.SessionId = ses->Suid;
+ ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
+ GFP_KERNEL);
+ if (ntlmssp_blob == NULL) {
+ cERROR(1, "failed to malloc ntlmssp blob");
+ rc = -ENOMEM;
+ goto ssetup_exit;
+ }
+ rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
+ nls_cp);
+ if (rc) {
+ cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
+ goto ssetup_exit; /* BB double check error handling */
+ }
+ if (use_spnego) {
+ /* blob_length = build_spnego_ntlmssp_blob(
+ &security_blob,
+ blob_length,
+ ntlmssp_blob); */
+ cERROR(1, "spnego not supported for SMB2 yet");
+ rc = -EOPNOTSUPP;
+ kfree(ntlmssp_blob);
+ goto ssetup_exit;
+ } else {
+ security_blob = ntlmssp_blob;
+ }
+ } else {
+ cERROR(1, "illegal ntlmssp phase");
+ rc = -EIO;
+ goto ssetup_exit;
+ }
+
+ /* Testing shows that buffer offset must be at location of Buffer[0] */
+ req->SecurityBufferOffset =
+ cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
+ 1 /* pad */ - 4 /* rfc1001 len */);
+ req->SecurityBufferLength = cpu_to_le16(blob_length);
+ iov[1].iov_base = security_blob;
+ iov[1].iov_len = blob_length;
+
+ inc_rfc1001_len(req, blob_length - 1 /* pad */);
+
+ /* BB add code to build os and lm fields */
+
+ rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
+
+ kfree(security_blob);
+ rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
+ if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
+ if (phase != NtLmNegotiate) {
+ cERROR(1, "Unexpected more processing error");
+ goto ssetup_exit;
+ }
+ if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
+ le16_to_cpu(rsp->SecurityBufferOffset)) {
+ cERROR(1, "Invalid security buffer offset %d",
+ le16_to_cpu(rsp->SecurityBufferOffset));
+ rc = -EIO;
+ goto ssetup_exit;
+ }
+
+ /* NTLMSSP Negotiate sent now processing challenge (response) */
+ phase = NtLmChallenge; /* process ntlmssp challenge */
+ rc = 0; /* MORE_PROCESSING is not an error here but expected */
+ ses->Suid = rsp->hdr.SessionId;
+ rc = decode_ntlmssp_challenge(rsp->Buffer,
+ le16_to_cpu(rsp->SecurityBufferLength), ses);
+ }
+
+ /*
+ * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
+ * but at least the raw NTLMSSP case works.
+ */
+ /*
+ * No tcon so can't do
+ * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
+ */
+ if (rc != 0)
+ goto ssetup_exit;
+
+ if (rsp == NULL) {
+ rc = -EIO;
+ goto ssetup_exit;
+ }
+
+ ses->session_flags = le16_to_cpu(rsp->SessionFlags);
+ssetup_exit:
+ free_rsp_buf(resp_buftype, rsp);
+
+ /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
+ if ((phase == NtLmChallenge) && (rc == 0))
+ goto ssetup_ntlmssp_authenticate;
+ return rc;
+}
+
+int
+SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
+{
+ struct smb2_logoff_req *req; /* response is also trivial struct */
+ int rc = 0;
+ struct TCP_Server_Info *server;
+
+ cFYI(1, "disconnect session %p", ses);
+
+ if (ses && (ses->server))
+ server = ses->server;
+ else
+ return -EIO;
+
+ rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
+ if (rc)
+ return rc;
+
+ /* since no tcon, smb2_init can not do this, so do here */
+ req->hdr.SessionId = ses->Suid;
+
+ rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
+ /*
+ * No tcon so can't do
+ * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
+ */
+ return rc;
+}