示例#1
0
/*
  we have a full request in our receive buffer - match it to a pending request
  and process
 */
static NTSTATUS smbcli_transport_finish_recv(void *private_data, DATA_BLOB blob)
{
	struct smbcli_transport *transport = talloc_get_type(private_data,
							     struct smbcli_transport);
	uint8_t *buffer, *hdr, *vwv;
	int len;
	uint16_t wct=0, mid = 0, op = 0;
	struct smbcli_request *req = NULL;

	buffer = blob.data;
	len = blob.length;

	hdr = buffer+NBT_HDR_SIZE;
	vwv = hdr + HDR_VWV;

	/* see if it could be an oplock break request */
	if (smbcli_handle_oplock_break(transport, len, hdr, vwv)) {
		talloc_free(buffer);
		return NT_STATUS_OK;
	}

	/* at this point we need to check for a readbraw reply, as
	   these can be any length */
	if (transport->readbraw_pending) {
		transport->readbraw_pending = 0;

		/* it must match the first entry in the pending queue
		   as the client is not allowed to have outstanding
		   readbraw requests */
		req = transport->pending_recv;
		if (!req) goto error;

		req->in.buffer = buffer;
		talloc_steal(req, buffer);
		req->in.size = len;
		req->in.allocated = req->in.size;
		goto async;
	}

	if (len >= MIN_SMB_SIZE) {
		/* extract the mid for matching to pending requests */
		mid = SVAL(hdr, HDR_MID);
		wct = CVAL(hdr, HDR_WCT);
		op  = CVAL(hdr, HDR_COM);
	}

	/* match the incoming request against the list of pending requests */
	for (req=transport->pending_recv; req; req=req->next) {
		if (req->mid == mid) break;
	}

	/* see if it's a ntcancel reply for the current MID */
	req = smbcli_handle_ntcancel_reply(req, len, hdr);

	if (!req) {
		DEBUG(1,("Discarding unmatched reply with mid %d op %d\n", mid, op));
		goto error;
	}

	/* fill in the 'in' portion of the matching request */
	req->in.buffer = buffer;
	talloc_steal(req, buffer);
	req->in.size = len;
	req->in.allocated = req->in.size;

	/* handle NBT session replies */
	if (req->in.size >= 4 && req->in.buffer[0] != 0) {
		req->status = NT_STATUS_OK;
		goto async;
	}

	/* handle non-SMB replies */
	if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE) {
		req->state = SMBCLI_REQUEST_ERROR;
		goto error;
	}

	if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
		DEBUG(2,("bad reply size for mid %d\n", mid));
		req->status = NT_STATUS_UNSUCCESSFUL;
		req->state = SMBCLI_REQUEST_ERROR;
		goto error;
	}

	req->in.hdr = hdr;
	req->in.vwv = vwv;
	req->in.wct = wct;
	if (req->in.size >= NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
		req->in.data = req->in.vwv + VWV(wct) + 2;
		req->in.data_size = SVAL(req->in.vwv, VWV(wct));
		if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct) + req->in.data_size) {
			DEBUG(3,("bad data size for mid %d\n", mid));
			/* blergh - w2k3 gives a bogus data size values in some
			   openX replies */
			req->in.data_size = req->in.size - (NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct));
		}
	}
	req->in.ptr = req->in.data;
	req->flags2 = SVAL(req->in.hdr, HDR_FLG2);

	smb_setup_bufinfo(req);

	if (!(req->flags2 & FLAGS2_32_BIT_ERROR_CODES)) {
		int eclass = CVAL(req->in.hdr,HDR_RCLS);
		int code = SVAL(req->in.hdr,HDR_ERR);
		if (eclass == 0 && code == 0) {
			transport->error.e.nt_status = NT_STATUS_OK;
		} else {
			transport->error.e.nt_status = NT_STATUS_DOS(eclass, code);
		}
	} else {
		transport->error.e.nt_status = NT_STATUS(IVAL(req->in.hdr, HDR_RCLS));
	}

	req->status = transport->error.e.nt_status;
	if (NT_STATUS_IS_OK(req->status)) {
		transport->error.etype = ETYPE_NONE;
	} else {
		transport->error.etype = ETYPE_SMB;
	}

	if (!smbcli_request_check_sign_mac(req)) {
		transport->error.etype = ETYPE_SOCKET;
		transport->error.e.socket_error = SOCKET_READ_BAD_SIG;
		req->state = SMBCLI_REQUEST_ERROR;
		req->status = NT_STATUS_ACCESS_DENIED;
		goto error;
	};

async:
	/* if this request has an async handler then call that to
	   notify that the reply has been received. This might destroy
	   the request so it must happen last */

	req->state = SMBCLI_REQUEST_DONE;

	if (req->recv_helper.fn) {
		/*
		 * let the recv helper decide in
		 * what state the request really is
		 */
		req->state = req->recv_helper.fn(req);

		/* if more parts are needed, wait for them */
		if (req->state <= SMBCLI_REQUEST_RECV) {
			return NT_STATUS_OK;
		}
	}
	DLIST_REMOVE(transport->pending_recv, req);
	if (req->async.fn) {
		req->async.fn(req);
	}
	return NT_STATUS_OK;

error:
	if (req) {
		DLIST_REMOVE(transport->pending_recv, req);
		req->state = SMBCLI_REQUEST_ERROR;
		if (req->async.fn) {
			req->async.fn(req);
		}
	} else {
		talloc_free(buffer);
	}
	return NT_STATUS_OK;
}
示例#2
0
文件: sesssetup.c 项目: rti7743/samba
/*
  handler for completion of a smbcli_request sub-request
*/
static void request_handler(struct smbcli_request *req)
{
	struct composite_context *c = (struct composite_context *)req->async.private_data;
	struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
	struct smbcli_session *session = req->session;
	DATA_BLOB session_key = data_blob(NULL, 0);
	DATA_BLOB null_data_blob = data_blob(NULL, 0);
	NTSTATUS session_key_err, nt_status;
	struct smbcli_request *check_req = NULL;
	const char *os = NULL;
	const char *lanman = NULL;

	if (req->sign_caller_checks) {
		req->do_not_free = true;
		check_req = req;
	}

	state->remote_status = smb_raw_sesssetup_recv(req, state, &state->setup);
	c->status = state->remote_status;
	state->req = NULL;

	/*
	 * we only need to check the signature if the
	 * NT_STATUS_OK is returned
	 */
	if (!NT_STATUS_IS_OK(state->remote_status)) {
		talloc_free(check_req);
		check_req = NULL;
	}

	switch (state->setup.old.level) {
	case RAW_SESSSETUP_OLD:
		state->io->out.vuid = state->setup.old.out.vuid;
		/* This doesn't work, as this only happens on old
		 * protocols, where this comparison won't match. */
		if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
			/* we neet to reset the vuid for a new try */
			session->vuid = 0;
			if (cli_credentials_wrong_password(state->io->in.credentials)) {
				nt_status = session_setup_old(c, session, 
							      state->io, 
							      &state->req);
				if (NT_STATUS_IS_OK(nt_status)) {
					talloc_free(check_req);
					c->status = nt_status;
					composite_continue_smb(c, state->req, request_handler, c);
					return;
				}
			}
		}
		os = state->setup.old.out.os;
		lanman = state->setup.old.out.lanman;
		break;

	case RAW_SESSSETUP_NT1:
		state->io->out.vuid = state->setup.nt1.out.vuid;
		if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
			/* we neet to reset the vuid for a new try */
			session->vuid = 0;
			if (cli_credentials_wrong_password(state->io->in.credentials)) {
				nt_status = session_setup_nt1(c, session, 
							      state->io, 
							      &state->req);
				if (NT_STATUS_IS_OK(nt_status)) {
					talloc_free(check_req);
					c->status = nt_status;
					composite_continue_smb(c, state->req, request_handler, c);
					return;
				}
			}
		}
		os = state->setup.nt1.out.os;
		lanman = state->setup.nt1.out.lanman;
		break;

	case RAW_SESSSETUP_SPNEGO:
		state->io->out.vuid = state->setup.spnego.out.vuid;
		if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
			/* we need to reset the vuid for a new try */
			session->vuid = 0;
			if (cli_credentials_wrong_password(state->io->in.credentials)) {
				nt_status = session_setup_spnego(c, session, 
								      state->io, 
								      &state->req);
				if (NT_STATUS_IS_OK(nt_status)) {
					talloc_free(check_req);
					c->status = nt_status;
					composite_continue_smb(c, state->req, request_handler, c);
					return;
				}
			}
		}
		if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) && 
		    !NT_STATUS_IS_OK(c->status)) {
			break;
		}
		if (NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {

			/* The status value here, from the earlier pass at GENSEC is
			 * vital to the security of the system.  Even if the other end
			 * accepts, if GENSEC claims 'MORE_PROCESSING_REQUIRED' then
			 * you must keep feeding it blobs, or else the remote
			 * host/attacker might avoid mutal authentication
			 * requirements */
			
			state->gensec_status = gensec_update(session->gensec, state,
							 state->setup.spnego.out.secblob,
							 &state->setup.spnego.in.secblob);
			c->status = state->gensec_status;
			if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) && 
			    !NT_STATUS_IS_OK(c->status)) {
				break;
			}
		} else {
			state->setup.spnego.in.secblob = data_blob(NULL, 0);
		}

		if (NT_STATUS_IS_OK(state->remote_status)) {
			if (state->setup.spnego.in.secblob.length) {
				c->status = NT_STATUS_INTERNAL_ERROR;
				break;
			}
			session_key_err = gensec_session_key(session->gensec, session, &session->user_session_key);
			if (NT_STATUS_IS_OK(session_key_err)) {
				smbcli_transport_simple_set_signing(session->transport, session->user_session_key, null_data_blob);
			}
		}

		if (state->setup.spnego.in.secblob.length) {
			/* 
			 * set the session->vuid value only for calling
			 * smb_raw_sesssetup_send()
			 */
			uint16_t vuid = session->vuid;
			session->vuid = state->io->out.vuid;
			state->req = smb_raw_sesssetup_send(session, &state->setup);
			session->vuid = vuid;
			if (state->req) {
				state->req->sign_caller_checks = true;
			}
			composite_continue_smb(c, state->req, request_handler, c);
			return;
		}
		os = state->setup.spnego.out.os;
		lanman = state->setup.spnego.out.lanman;
		break;

	case RAW_SESSSETUP_SMB2:
		c->status = NT_STATUS_INTERNAL_ERROR;
		break;
	}

	if (check_req) {
		check_req->sign_caller_checks = false;
		if (!smbcli_request_check_sign_mac(check_req)) {
			c->status = NT_STATUS_ACCESS_DENIED;
		}
		talloc_free(check_req);
		check_req = NULL;
	}

	/* enforce the local signing required flag */
	if (NT_STATUS_IS_OK(c->status) && !cli_credentials_is_anonymous(state->io->in.credentials)) {
		if (!session->transport->negotiate.sign_info.doing_signing 
		    && session->transport->negotiate.sign_info.mandatory_signing) {
			DEBUG(0, ("SMB signing required, but server does not support it\n"));
			c->status = NT_STATUS_ACCESS_DENIED;
		}
	}

	if (!NT_STATUS_IS_OK(c->status)) {
		composite_error(c, c->status);
		return;
	}

	if (os) {
		session->os = talloc_strdup(session, os);
		if (composite_nomem(session->os, c)) return;
	} else {
		session->os = NULL;
	}
	if (lanman) {
		session->lanman = talloc_strdup(session, lanman);
		if (composite_nomem(session->lanman, c)) return;
	} else {
		session->lanman = NULL;
	}

	composite_done(c);
}