From: Ralph Boehme <slow@samba.org>
Date: Wed, 20 May 2020 21:03:30 +0000 (+0200)
Subject: vfs_widelinks: implement SMB_VFS_OPENAT()
X-Git-Tag: ldb-2.2.0~388
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c71215bd64b012ab6ff485f73c8a42390fb4fba6;p=thirdparty%2Fsamba.git

vfs_widelinks: implement SMB_VFS_OPENAT()

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
---

diff --git a/source3/modules/vfs_widelinks.c b/source3/modules/vfs_widelinks.c
index 9f5661b84ae..5267c8b218e 100644
--- a/source3/modules/vfs_widelinks.c
+++ b/source3/modules/vfs_widelinks.c
@@ -388,6 +388,39 @@ static int widelinks_open(vfs_handle_struct *handle,
 			mode);
 }
 
+static int widelinks_openat(vfs_handle_struct *handle,
+			    const struct files_struct *dirfsp,
+			    const struct smb_filename *smb_fname,
+			    files_struct *fsp,
+			    int flags,
+			    mode_t mode)
+{
+	struct widelinks_config *config = NULL;
+
+	SMB_VFS_HANDLE_GET_DATA(handle,
+				config,
+				struct widelinks_config,
+				return -1);
+
+	if (config->active &&
+	    (config->cwd != NULL) &&
+	    !(smb_fname->flags & SMB_FILENAME_POSIX_PATH))
+	{
+		/*
+		 * Module active, openat after chdir (see note 1b above) and not
+		 * a POSIX open (POSIX sees symlinks), so remove O_NOFOLLOW.
+		 */
+		flags = (flags & ~O_NOFOLLOW);
+	}
+
+	return SMB_VFS_NEXT_OPENAT(handle,
+				   dirfsp,
+				   smb_fname,
+				   fsp,
+				   flags,
+				   mode);
+}
+
 static struct dirent *widelinks_readdir(vfs_handle_struct *handle,
 			DIR *dirp,
 			SMB_STRUCT_STAT *sbuf)
@@ -425,6 +458,7 @@ static struct vfs_fn_pointers vfs_widelinks_fns = {
 	.connect_fn = widelinks_connect,
 
 	.open_fn = widelinks_open,
+	.openat_fn = widelinks_openat,
 	.lstat_fn = widelinks_lstat,
 	/*
 	 * NB. We don't need an lchown function as this