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From 4d827f0d75a53d3952288ab882efbddea7ffadfe Mon Sep 17 00:00:00 2001
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From: "djm@openbsd.org" <djm@openbsd.org>
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Date: Tue, 4 Apr 2017 00:24:56 +0000
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Subject: [PATCH] upstream commit
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disallow creation (of empty files) in read-only mode;
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reported by Michal Zalewski, feedback & ok deraadt@
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Upstream-ID: 5d9c8f2fa8511d4ecf95322994ffe73e9283899b
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---
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sftp-server.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/sftp-server.c b/sftp-server.c
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index 3619cdfc0..df0fb5068 100644
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--- a/sftp-server.c
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+++ b/sftp-server.c
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@@ -1,4 +1,4 @@
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-/* $OpenBSD: sftp-server.c,v 1.110 2016/09/12 01:22:38 deraadt Exp $ */
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+/* $OpenBSD: sftp-server.c,v 1.111 2017/04/04 00:24:56 djm Exp $ */
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/*
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* Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
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*
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@@ -691,8 +691,8 @@ process_open(u_int32_t id)
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logit("open \"%s\" flags %s mode 0%o",
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name, string_from_portable(pflags), mode);
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if (readonly &&
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- ((flags & O_ACCMODE) == O_WRONLY ||
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- (flags & O_ACCMODE) == O_RDWR)) {
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+ ((flags & O_ACCMODE) != O_RDONLY ||
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+ (flags & (O_CREAT|O_TRUNC)) != 0)) {
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verbose("Refusing open request in read-only mode");
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status = SSH2_FX_PERMISSION_DENIED;
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} else {
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