我有 2 个摘录需要解释,第一个是 XINETD.CONF,第二个是 /etc/xinetd.d。我应该确保 tftp 被停用,因为它根本不提供身份验证,因此会带来安全风险。从 /etc/xinetd.d ,我可以清楚地看到
-rw-r--r--. 1 root root 23 Feb 24 2017 tftp
tftp 是否存在,但我不太确定 [FILE]: XINETD.CONF 中的配置是否禁用或删除了 tftp 的访问。那么我该如何解释[FILE]: XINETD.CONF呢?
====================================================
[FILE]: XINETD.CONF
-rw-------. 1 root root 1022 Feb 24 2017 /etc/xinetd.conf
====================================================
#
# This is the master xinetd configuration file. Settings in the
# default section will be inherited by all service configurations
# unless explicitly overridden in the service configuration. See
# xinetd.conf in the man pages for a more detailed explanation of
# these attributes.
defaults
{
# The next two items are intended to be a quick access place to
# temporarily enable or disable services.
#
# enabled =
# disabled =
# Define general logging characteristics.
log_type = SYSLOG daemon info
log_on_failure = HOST
log_on_success = PID HOST DURATION EXIT
# Define access restriction defaults
#
# no_access =
# only_from =
# max_load = 0
cps = 50 10
instances = 50
per_source = 10
# Address and networking defaults
#
# bind =
# mdns = yes
v6only = no
# setup environmental attributes
#
# passenv =
groups = yes
umask = 002
# Generally, banners are not used. This sets up their global defaults
#
# banner =
# banner_fail =
# banner_success =
}
includedir /etc/xinetd.d
====================================================
/etc/xinetd.d
/etc/xinetd.d:
total 68
drwxr-xr-x. 2 root root 4096 Feb 24 2017 .
drwxr-xr-x. 102 root root 12288 Sep 9 02:31 ..
-rw-------. 1 root root 1198 Feb 24 2017 chargen-dgram
-rw-------. 1 root root 1159 Dec 16 2015 chargen-stream
-rw-------. 1 root root 1199 Feb 24 2017 daytime-dgram
-rw-------. 1 root root 1159 Dec 16 2015 daytime-stream
-rw-------. 1 root root 1198 Feb 24 2017 discard-dgram
-rw-------. 1 root root 1200 Feb 24 2017 discard-stream
-rw-------. 1 root root 1189 Feb 24 2017 echo-dgram
-rw-------. 1 root root 1150 Dec 16 2015 echo-stream
-rw-r--r--. 1 root root 332 Mar 28 2014 rsync
-rw-------. 1 root root 1253 Feb 24 2017 tcpmux-server
-rw-r--r--. 1 root root 23 Feb 24 2017 tftp
-rw-------. 1 root root 1149 Dec 16 2015 time-dgram
-rw-------. 1 root root 1150 Dec 16 2015 time-stream
答案1
这应该有助于禁用该服务: https://www.oreilly.com/library/view/linux-security-cookbook/0596003919/ch03s03.html
几乎..打开该 tftp 文件,然后添加disable = yes选项
service tftp
{
...
disable = yes
}