Image

知识库 → 解决方案:ProFTPD、SSH 授权缓慢

[虚拟服务器]
出版日期: 02.06.2025

不久前,Linux Debian 12上发布了PAM.d服务的更新。这类服务的更新非常罕见,更新后,尝试登录时开始出现长时间的延迟:

ProFTPd

在我们的情况下,它通过xinetd服务运行,并不是一个独立的服务,这意味着授权是通过PAM.d完成的。

SSH

配置文件中的选项默认是启用的:

UsePAM yes

因此,两个服务都依赖于PAM.d的设置。

解决方案

长时间延迟的原因是配置文件中存在以下行:

session	optional	pam_systemd.so

在配置文件中

/etc/pam.d/common-session

去掉该行后,文件应如下所示:

#
# /etc/pam.d/common-session - session-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define tasks to be performed
# at the start and end of interactive sessions.
#
# As of pam 1.0.1-6, this file is managed by pam-auth-update by default.
# To take advantage of this, it is recommended that you configure any
# local modules either before or after the default block, and use
# pam-auth-update to manage selection of other modules.  See
# pam-auth-update(8) for details.

# here are the per-package modules (the "Primary" block)
session	[default=1]			pam_permit.so
# here's the fallback if no module succeeds
session	requisite			pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
session	required			pam_permit.so
# and here are more per-package modules (the "Additional" block)
session	required	pam_unix.so 
# end of pam-auth-update config

进行这些更改后,授权再次开始快速运行,没有延迟。

相关文章:通过SSH连接时长时间延迟的原因及故障排除





No Comments Yet