Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/source3/smbd/smb1_service.c b/source3/smbd/smb1_service.c
new file mode 100644
index 0000000..df26b9f
--- /dev/null
+++ b/source3/smbd/smb1_service.c
@@ -0,0 +1,241 @@
+/*
+   Unix SMB/CIFS implementation.
+   service (connection) opening and closing
+   Copyright (C) Andrew Tridgell 1992-1998
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "system/passwd.h" /* uid_wrapper */
+#include "../lib/tsocket/tsocket.h"
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "../librpc/gen_ndr/netlogon.h"
+#include "../libcli/security/security.h"
+#include "printing/pcap.h"
+#include "passdb/lookup_sid.h"
+#include "auth.h"
+#include "../auth/auth_util.h"
+#include "lib/param/loadparm.h"
+#include "messages.h"
+#include "lib/afs/afs_funcs.h"
+#include "lib/util_path.h"
+#include "lib/util/string_wrappers.h"
+#include "source3/lib/substitute.h"
+
+/****************************************************************************
+ Make a connection to a service from SMB1. Internal interface.
+****************************************************************************/
+
+static connection_struct *make_connection_smb1(struct smb_request *req,
+					NTTIME now,
+					int snum,
+					const char *pdev,
+					NTSTATUS *pstatus)
+{
+	const struct loadparm_substitution *lp_sub =
+		loadparm_s3_global_substitution();
+	uint32_t session_global_id;
+	char *share_name = NULL;
+	struct smbXsrv_tcon *tcon;
+	NTSTATUS status;
+	struct connection_struct *conn;
+
+	session_global_id = req->session->global->session_global_id;
+	share_name = lp_servicename(talloc_tos(), lp_sub, snum);
+	if (share_name == NULL) {
+		*pstatus = NT_STATUS_NO_MEMORY;
+		return NULL;
+	}
+
+	if ((lp_max_connections(snum) > 0)
+	    && (count_current_connections(lp_const_servicename(snum), true) >=
+		lp_max_connections(snum))) {
+
+		DBG_WARNING("Max connections (%d) exceeded for [%s][%s]\n",
+			  lp_max_connections(snum),
+			  lp_const_servicename(snum), share_name);
+		TALLOC_FREE(share_name);
+		*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
+		return NULL;
+	}
+
+	status = smb1srv_tcon_create(req->xconn,
+				     session_global_id,
+				     share_name,
+				     now, &tcon);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("make_connection_smb1: Couldn't find free tcon for [%s] - %s\n",
+			 share_name, nt_errstr(status)));
+		TALLOC_FREE(share_name);
+		*pstatus = status;
+		return NULL;
+	}
+	TALLOC_FREE(share_name);
+
+	conn = conn_new(req->sconn);
+	if (!conn) {
+		TALLOC_FREE(tcon);
+
+		DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
+		*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
+		return NULL;
+	}
+
+	conn->cnum = tcon->global->tcon_wire_id;
+	conn->tcon = tcon;
+
+	*pstatus = make_connection_snum(req->xconn,
+					conn,
+					snum,
+					req->session,
+					pdev);
+	if (!NT_STATUS_IS_OK(*pstatus)) {
+		conn_free(conn);
+		TALLOC_FREE(tcon);
+		return NULL;
+	}
+
+	tcon->compat = talloc_move(tcon, &conn);
+	tcon->status = NT_STATUS_OK;
+
+	*pstatus = NT_STATUS_OK;
+
+	return tcon->compat;
+}
+
+/****************************************************************************
+ Make a connection to a service. External SMB1 interface.
+ *
+ * @param service
+****************************************************************************/
+
+connection_struct *make_connection(struct smb_request *req,
+				   NTTIME now,
+				   const char *service_in,
+				   const char *pdev, uint64_t vuid,
+				   NTSTATUS *status)
+{
+	struct smbd_server_connection *sconn = req->sconn;
+	struct smbXsrv_session *session = req->session;
+	const struct loadparm_substitution *lp_sub =
+		loadparm_s3_global_substitution();
+	uid_t euid;
+	char *service = NULL;
+	fstring dev;
+	int snum = -1;
+
+	fstrcpy(dev, pdev);
+
+	/* This must ONLY BE CALLED AS ROOT. As it exits this function as
+	 * root. */
+	if (!non_root_mode() && (euid = geteuid()) != 0) {
+		DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
+			 "(%u)\n", (unsigned int)euid ));
+		smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
+	}
+
+	if (conn_num_open(sconn) > 2047) {
+		*status = NT_STATUS_INSUFF_SERVER_RESOURCES;
+		return NULL;
+	}
+
+	if (session == NULL) {
+		DEBUG(1,("make_connection: refusing to connect with "
+			 "no session setup\n"));
+		*status = NT_STATUS_ACCESS_DENIED;
+		return NULL;
+	}
+
+	/* Logic to try and connect to the correct [homes] share, preferably
+	   without too many getpwnam() lookups.  This is particulary nasty for
+	   winbind usernames, where the share name isn't the same as unix
+	   username.
+	*/
+
+	if (strequal(service_in,HOMES_NAME)) {
+		if (session->homes_snum == -1) {
+			DEBUG(2, ("[homes] share not available for "
+				  "this user because it was not found "
+				  "or created at session setup "
+				  "time\n"));
+			*status = NT_STATUS_BAD_NETWORK_NAME;
+			return NULL;
+		}
+		DEBUG(5, ("making a connection to [homes] service "
+			  "created at session setup time\n"));
+		return make_connection_smb1(req, now,
+					    session->homes_snum,
+					    dev, status);
+	} else if ((session->homes_snum != -1)
+		   && strequal(service_in,
+			       lp_const_servicename(session->homes_snum))) {
+		DEBUG(5, ("making a connection to 'homes' service [%s] "
+			  "created at session setup time\n", service_in));
+		return make_connection_smb1(req, now,
+					    session->homes_snum,
+					    dev, status);
+	}
+
+	service = talloc_strdup(talloc_tos(), service_in);
+	if (!service) {
+		*status = NT_STATUS_NO_MEMORY;
+		return NULL;
+	}
+
+	if (!strlower_m(service)) {
+		DEBUG(2, ("strlower_m %s failed\n", service));
+		*status = NT_STATUS_INVALID_PARAMETER;
+		return NULL;
+	}
+
+	snum = find_service(talloc_tos(), service, &service);
+	if (!service) {
+		*status = NT_STATUS_NO_MEMORY;
+		return NULL;
+	}
+
+	if (snum < 0) {
+		if (strequal(service,"IPC$") ||
+		    (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
+			DEBUG(3,("refusing IPC connection to %s\n", service));
+			*status = NT_STATUS_ACCESS_DENIED;
+			return NULL;
+		}
+
+		DEBUG(3,("%s (%s) couldn't find service %s\n",
+			get_remote_machine_name(),
+			tsocket_address_string(
+				sconn->remote_address, talloc_tos()),
+			service));
+		*status = NT_STATUS_BAD_NETWORK_NAME;
+		return NULL;
+	}
+
+	/* Handle non-Dfs clients attempting connections to msdfs proxy */
+	if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), lp_sub, snum) != '\0'))  {
+		DEBUG(3, ("refusing connection to dfs proxy share '%s' "
+			  "(pointing to %s)\n",
+			service, lp_msdfs_proxy(talloc_tos(), lp_sub, snum)));
+		*status = NT_STATUS_BAD_NETWORK_NAME;
+		return NULL;
+	}
+
+	DEBUG(5, ("making a connection to 'normal' service %s\n", service));
+
+	return make_connection_smb1(req, now, snum,
+				    dev, status);
+}