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From a423831f25396c54f92cdfc6f92a104ed77c2ee6 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Lyson=C4=9Bk?= <olysonek@redhat.com>
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Date: Fri, 24 Nov 2017 11:26:37 +0100
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Subject: [PATCH] Improve documentation of ascii_* options
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Resolves: rhbz#1517227
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---
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vsftpd.conf | 3 ++-
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vsftpd.conf.5 | 20 ++++++++++++++++++++
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2 files changed, 22 insertions(+), 1 deletion(-)
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diff --git a/vsftpd.conf b/vsftpd.conf
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index 39d1955..acbc1e9 100644
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--- a/vsftpd.conf
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+++ b/vsftpd.conf
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@@ -73,7 +73,8 @@ xferlog_std_format=YES
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#
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# By default the server will pretend to allow ASCII mode but in fact ignore
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# the request. Turn on the below options to have the server actually do ASCII
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-# mangling on files when in ASCII mode.
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+# mangling on files when in ASCII mode. The vsftpd.conf(5) man page explains
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+# the behaviour when these options are disabled.
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# Beware that on some FTP servers, ASCII support allows a denial of service
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# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
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# predicted this attack and has always been safe, reporting the size of the
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diff --git a/vsftpd.conf.5 b/vsftpd.conf.5
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index d1f0db5..b6ddf05 100644
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--- a/vsftpd.conf.5
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+++ b/vsftpd.conf.5
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@@ -113,11 +113,31 @@ Default: YES
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.TP
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.B ascii_download_enable
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When enabled, ASCII mode data transfers will be honoured on downloads.
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+When disabled, the server will pretend to allow ASCII mode but in fact
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+ignore requests to activate it. So the client will think the ASCII mode
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+is active and therefore may still translate any
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+.BR <CRLF>
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+character sequences in the received file. See the following article for
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+a detailed explanation of the behaviour:
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+https://access.redhat.com/articles/3250241.
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+
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+Turn this option on to have the server actually do
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+ASCII mangling on files when in ASCII mode.
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Default: NO
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.TP
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.B ascii_upload_enable
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When enabled, ASCII mode data transfers will be honoured on uploads.
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+When disabled, the server will pretend to allow ASCII mode but in fact
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+ignore requests to activate it. So the client will think the ASCII mode
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+is active and will translate native line terminators to the standard
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+.BR <CRLF>
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+line terminators for transmission, but the server will not do
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+any translation. See the following article for a detailed explanation
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+of the behaviour: https://access.redhat.com/articles/3250241.
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+
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+Turn this option on to have the server actually do
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+ASCII mangling on files when in ASCII mode.
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Default: NO
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.TP
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--
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2.14.3
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