Move cached cwd onto conn struct.

This enables us to make VFS modules safe for use in root called
code when we've changed directory under conn->connectpath.

3 files changed, 17 insertions, 1 deletions

diff --git a/source3/include/vfs.h b/source3/include/vfs.h
index 8e48803fe7d..c83e7ed54b8 100644
--- a/source3/include/vfs.h
+++ b/source3/include/vfs.h
@@ -145,6 +145,7 @@
 /* Leave at 29 - not yet released. Add durable handle functions - metze/obnox */
 /* Leave at 29 - not yet released. Added sys_acl_blob_get_file and sys_acl_blob_get_fd */
 /* Bump to version 30 - Samba 4.0.0 will ship with interface version 30 */
+/* Leave at 30 - not yet released. Added conn->cwd to save vfs_GetWd() calls. */
 #define SMB_VFS_INTERFACE_VERSION 30
 
 /*
@@ -315,6 +316,7 @@ typedef struct connection_struct {
 	enum timestamp_set_resolution ts_res;
 	char *connectpath;
 	char *origpath;
+	char *cwd; /* Working directory. */
 
 	struct vfs_handle_struct *vfs_handles;		/* for the new plugins */
 
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index 0cd48f89504..b2d3d4ddc16 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -164,6 +164,12 @@ bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
 
 	talloc_free(conn->connectpath);
 	conn->connectpath = destname;
+	/* Ensure conn->cwd is initialized - start as conn->connectpath. */
+	TALLOC_FREE(conn->cwd);
+	conn->cwd = talloc_strdup(conn, conn->connectpath);
+	if (!conn->cwd) {
+		return false;
+	}
 	return true;
 }
 
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 3eda2cf97be..7d194404f47 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -799,13 +799,21 @@ const char *vfs_readdirname(connection_struct *conn, void *p,
 
 int vfs_ChDir(connection_struct *conn, const char *path)
 {
+	int ret;
+
 	if (strcsequal(path,".")) {
 		return 0;
 	}
 
 	DEBUG(4,("vfs_ChDir to %s\n",path));
 
-	return SMB_VFS_CHDIR(conn,path);
+	ret = SMB_VFS_CHDIR(conn,path);
+	if (ret == 0) {
+		TALLOC_FREE(conn->cwd);
+		conn->cwd = vfs_GetWd(conn, conn);
+		DEBUG(4,("vfs_ChDir got %s\n",conn->cwd));
+	}
+	return ret;
 }
 
 /*******************************************************************