安装denyhost防止SSH和FTP被暴力破解

做人到低调啊,我其实很低调的嘛,不知道得罪了哪个人,我的SSH和FTP一直被人扫描,而且还是那种多线程的,导致我的SSH和FTP开启了多进程来应付它的暴力破解,无奈之下还有改了端口了.
不过这是治标不治本的啦,Google一翻,终于给我找到了这个软件DenyHosts,DenyHosts是用Python语言编写的一个程序,它会分析你的日志文件,当发现重复的错误登录时就会记录IP到/etc/hosts.deny文件,然后自动屏蔽IP.功能很不错吧,下面是安装过程 (环境CentOS 5.5, DenyHosts 2.6)

下载:wget http://imcat.in/down/DenyHosts-2.6.tar.gz
安装:
tar -zxvf DenyHosts-2.6.tar.gz
cd DenyHosts-2.6
python setup.py install


修改配置文件:
cp /usr/share/denyhosts/denyhosts.cfg-dist /usr/share/denyhosts/denyhosts.cfg
vi /usr/share/denyhosts/denyhosts.cfg

配置文件比较长,需要修改的,我都做了注释,自己看吧

############ THESE SETTINGS ARE REQUIRED ############

########################################################################
#
# SECURE_LOG: the log file that contains sshd logging info
# if you are not sure, grep "sshd:" /var/log/*
#
# The file to process can be overridden with the --file command line
# argument
#
# Redhat or Fedora Core:
#日志文件,根据这个文件来判断
SECURE_LOG = /var/log/secure
#
# Mandrake, FreeBSD or OpenBSD:
#SECURE_LOG = /var/log/auth.log
#
# SuSE:
#SECURE_LOG = /var/log/messages
#
# Mac OS X (v10.4 or greater -
#   also refer to:   http://www.denyhosts.net/faq.html#macos
#SECURE_LOG = /private/var/log/asl.log
#
# Mac OS X (v10.3 or earlier):
#SECURE_LOG=/private/var/log/system.log
#
########################################################################

########################################################################
#
# HOSTS_DENY: the file which contains restricted host access information
#
# Most operating systems:
#记录屏蔽的IP文件
HOSTS_DENY = /etc/hosts.deny
#
# Some BSD (FreeBSD) Unixes:
#HOSTS_DENY = /etc/hosts.allow
#
# Another possibility (also see the next option):
#HOSTS_DENY = /etc/hosts.evil
#######################################################################

########################################################################
#
# PURGE_DENY: removed HOSTS_DENY entries that are older than this time
#             when DenyHosts is invoked with the --purge flag
#
#      format is: i[dhwmy]
#      Where 'i' is an integer (eg. 7)
#            'm' = minutes
#            'h' = hours
#            'd' = days
#            'w' = weeks
#            'y' = years
#
# never purge:
#多久清除屏蔽的IP,我设置一天
PURGE_DENY = 1d
#
# purge entries older than 1 week
#PURGE_DENY = 1w
#
# purge entries older than 5 days
#PURGE_DENY = 5d
#######################################################################

#######################################################################
#
# PURGE_THRESHOLD: defines the maximum times a host will be purged.
# Once this value has been exceeded then this host will not be purged.
# Setting this parameter to 0 (the default) disables this feature.
#
# default: a denied host can be purged/re-added indefinitely
#PURGE_THRESHOLD = 0
#
# a denied host will be purged at most 2 times.
#PURGE_THRESHOLD = 2
#
#######################################################################

#######################################################################
#
# BLOCK_SERVICE: the service name that should be blocked in HOSTS_DENY
#
# man 5 hosts_access for details
#
# eg.   sshd: 127.0.0.1  # will block sshd logins from 127.0.0.1
#
# To block all services for the offending host:
#BLOCK_SERVICE = ALL
# To block only sshd:
#禁止的服务,我设置为全部,禁止登录SSH和/FTP
BLOCK_SERVICE  = ALL
# To only record the offending host and nothing else (if using
# an auxilary file to list the hosts).  Refer to:
# http://denyhosts.sourceforge.net/faq.html#aux
#BLOCK_SERVICE =
#
#######################################################################

#######################################################################
#
# DENY_THRESHOLD_INVALID: block each host after the number of failed login
# attempts has exceeded this value.  This value applies to invalid
# user login attempts (eg. non-existent user accounts)
#
#允许无效用户失败的数次
DENY_THRESHOLD_INVALID = 1
#
#######################################################################

#######################################################################
#
# DENY_THRESHOLD_VALID: block each host after the number of failed
# login attempts has exceeded this value.  This value applies to valid
# user login attempts (eg. user accounts that exist in /etc/passwd) except
# for the "root" user
#允许普通用户失败的次数
DENY_THRESHOLD_VALID = 1
#
#######################################################################

#######################################################################
#
# DENY_THRESHOLD_ROOT: block each host after the number of failed
# login attempts has exceeded this value.  This value applies to
# "root" user login attempts only.
#允许root用户失败的次数
DENY_THRESHOLD_ROOT = 3
#
#######################################################################

#######################################################################
#
# DENY_THRESHOLD_RESTRICTED: block each host after the number of failed
# login attempts has exceeded this value.  This value applies to
# usernames that appear in the WORK_DIR/restricted-usernames file only.
#
DENY_THRESHOLD_RESTRICTED = 1
#
#######################################################################

#######################################################################
#
# WORK_DIR: the path that DenyHosts will use for writing data to
# (it will be created if it does not already exist).
#
# Note: it is recommended that you use an absolute pathname
# for this value (eg. /home/foo/denyhosts/data)
#
WORK_DIR = /usr/share/denyhosts/data
#
#######################################################################

#######################################################################
#
# SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS
#
# SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS=YES|NO
# If set to YES, if a suspicious login attempt results from an allowed-host
# then it is considered suspicious.  If this is NO, then suspicious logins
# from allowed-hosts will not be reported.  All suspicious logins from
# ip addresses that are not in allowed-hosts will always be reported.
#
SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS=YES
######################################################################

######################################################################
#
# HOSTNAME_LOOKUP
#
# HOSTNAME_LOOKUP=YES|NO
# If set to YES, for each IP address that is reported by Denyhosts,
# the corresponding hostname will be looked up and reported as well
# (if available).
#是否做域名反解析
HOSTNAME_LOOKUP=NO
#
######################################################################

######################################################################
#
# LOCK_FILE
#
# LOCK_FILE=/path/denyhosts
# If this file exists when DenyHosts is run, then DenyHosts will exit
# immediately.  Otherwise, this file will be created upon invocation
# and deleted upon exit.  This ensures that only one instance is
# running at a time.
#
# Redhat/Fedora:
LOCK_FILE = /var/lock/subsys/denyhosts
#
# Debian
#LOCK_FILE = /var/run/denyhosts.pid
#
# Misc
#LOCK_FILE = /tmp/denyhosts.lock
#
######################################################################

############ THESE SETTINGS ARE OPTIONAL ############

#######################################################################
#
# ADMIN_EMAIL: if you would like to receive emails regarding newly
# restricted hosts and suspicious logins, set this address to
# match your email address.  If you do not want to receive these reports
# leave this field blank (or run with the --noemail option)
#
# Multiple email addresses can be delimited by a comma, eg:
# ADMIN_EMAIL = foo@bar.com, bar@foo.com, etc@foobar.com
#管理员Email
ADMIN_EMAIL =
#
#######################################################################

#######################################################################
#
# SMTP_HOST and SMTP_PORT: if DenyHosts is configured to email
# reports (see ADMIN_EMAIL) then these settings specify the
# email server address (SMTP_HOST) and the server port (SMTP_PORT)
#
#
SMTP_HOST = localhost
SMTP_PORT = 25
#
#######################################################################

#######################################################################
#
# SMTP_USERNAME and SMTP_PASSWORD: set these parameters if your
# smtp email server requires authentication
#
#SMTP_USERNAME=foo
#SMTP_PASSWORD=bar
#
######################################################################

#######################################################################
#
# SMTP_FROM: you can specify the "From:" address in messages sent
# from DenyHosts when it reports thwarted abuse attempts
#
SMTP_FROM = DenyHosts <nobody@localhost>
#
#######################################################################

#######################################################################
#
# SMTP_SUBJECT: you can specify the "Subject:" of messages sent
# by DenyHosts when it reports thwarted abuse attempts
SMTP_SUBJECT = DenyHosts Report
#
######################################################################

######################################################################
#
# SMTP_DATE_FORMAT: specifies the format used for the "Date:" header
# when sending email messages.
#
# for possible values for this parameter refer to: man strftime
#
# the default:
#
#SMTP_DATE_FORMAT = %a, %d %b %Y %H:%M:%S %z
#
######################################################################

######################################################################
#
# SYSLOG_REPORT
#
# SYSLOG_REPORT=YES|NO
# If set to yes, when denied hosts are recorded the report data
# will be sent to syslog (syslog must be present on your system).
# The default is: NO
#
#SYSLOG_REPORT=NO
#
#SYSLOG_REPORT=YES
#
######################################################################

######################################################################
#
# ALLOWED_HOSTS_HOSTNAME_LOOKUP
#
# ALLOWED_HOSTS_HOSTNAME_LOOKUP=YES|NO
# If set to YES, for each entry in the WORK_DIR/allowed-hosts file,
# the hostname will be looked up.  If your versions of tcp_wrappers
# and sshd sometimes log hostnames in addition to ip addresses
# then you may wish to specify this option.
#
#ALLOWED_HOSTS_HOSTNAME_LOOKUP=NO
#
######################################################################

######################################################################
#
# AGE_RESET_VALID: Specifies the period of time between failed login
# attempts that, when exceeded will result in the failed count for
# this host to be reset to 0.  This value applies to login attempts
# to all valid users (those within /etc/passwd) with the
# exception of root.  If not defined, this count will never
# be reset.
#
# See the comments in the PURGE_DENY section (above)
# for details on specifying this value or for complete details
# refer to:  http://denyhosts.sourceforge.net/faq.html#timespec
#
AGE_RESET_VALID=5d
#
######################################################################

######################################################################
#
# AGE_RESET_ROOT: Specifies the period of time between failed login
# attempts that, when exceeded will result in the failed count for
# this host to be reset to 0.  This value applies to all login
# attempts to the "root" user account.  If not defined,
# this count will never be reset.
#
# See the comments in the PURGE_DENY section (above)
# for details on specifying this value or for complete details
# refer to:  http://denyhosts.sourceforge.net/faq.html#timespec
#
AGE_RESET_ROOT=25d
#
######################################################################

######################################################################
#
# AGE_RESET_RESTRICTED: Specifies the period of time between failed login
# attempts that, when exceeded will result in the failed count for
# this host to be reset to 0.  This value applies to all login
# attempts to entries found in the WORK_DIR/restricted-usernames file.
# If not defined, the count will never be reset.
#
# See the comments in the PURGE_DENY section (above)
# for details on specifying this value or for complete details
# refer to:  http://denyhosts.sourceforge.net/faq.html#timespec
#
AGE_RESET_RESTRICTED=25d
#
######################################################################

######################################################################
#
# AGE_RESET_INVALID: Specifies the period of time between failed login
# attempts that, when exceeded will result in the failed count for
# this host to be reset to 0.  This value applies to login attempts
# made to any invalid username (those that do not appear
# in /etc/passwd).  If not defined, count will never be reset.
#
# See the comments in the PURGE_DENY section (above)
# for details on specifying this value or for complete details
# refer to:  http://denyhosts.sourceforge.net/faq.html#timespec
#
AGE_RESET_INVALID=10d
#
######################################################################

######################################################################
#
# RESET_ON_SUCCESS: If this parameter is set to "yes" then the
# failed count for the respective ip address will be reset to 0
# if the login is successful.
#
# The default is RESET_ON_SUCCESS = no
#
#RESET_ON_SUCCESS = yes
#
#####################################################################

######################################################################
#
# PLUGIN_DENY: If set, this value should point to an executable
# program that will be invoked when a host is added to the
# HOSTS_DENY file.  This executable will be passed the host
# that will be added as it's only argument.
#
#PLUGIN_DENY=/usr/bin/true
#
######################################################################

######################################################################
#
# PLUGIN_PURGE: If set, this value should point to an executable
# program that will be invoked when a host is removed from the
# HOSTS_DENY file.  This executable will be passed the host
# that is to be purged as it's only argument.
#
#PLUGIN_PURGE=/usr/bin/true
#
######################################################################

######################################################################
#
# USERDEF_FAILED_ENTRY_REGEX: if set, this value should contain
# a regular expression that can be used to identify additional
# hackers for your particular ssh configuration.  This functionality
# extends the built-in regular expressions that DenyHosts uses.
# This parameter can be specified multiple times.
# See this faq entry for more details:
#    http://denyhosts.sf.net/faq.html#userdef_regex
#
#USERDEF_FAILED_ENTRY_REGEX=
#
#
######################################################################

######### THESE SETTINGS ARE SPECIFIC TO DAEMON MODE  ##########

#######################################################################
#
# DAEMON_LOG: when DenyHosts is run in daemon mode (--daemon flag)
# this is the logfile that DenyHosts uses to report it's status.
# To disable logging, leave blank.  (default is: /var/log/denyhosts)
#
DAEMON_LOG = /var/log/denyhosts
#
# disable logging:
#DAEMON_LOG =
#
######################################################################

#######################################################################
#
# DAEMON_LOG_TIME_FORMAT: when DenyHosts is run in daemon mode
# (--daemon flag) this specifies the timestamp format of
# the DAEMON_LOG messages (default is the ISO8061 format:
# ie. 2005-07-22 10:38:01,745)
#
# for possible values for this parameter refer to: man strftime
#
# Jan 1 13:05:59
#DAEMON_LOG_TIME_FORMAT = %b %d %H:%M:%S
#
# Jan 1 01:05:59
#DAEMON_LOG_TIME_FORMAT = %b %d %I:%M:%S
#
######################################################################

#######################################################################
#
# DAEMON_LOG_MESSAGE_FORMAT: when DenyHosts is run in daemon mode
# (--daemon flag) this specifies the message format of each logged
# entry.  By default the following format is used:
#
# %(asctime)s - %(name)-12s: %(levelname)-8s %(message)s
#
# Where the "%(asctime)s" portion is expanded to the format
# defined by DAEMON_LOG_TIME_FORMAT
#
# This string is passed to python's logging.Formatter contstuctor.
# For details on the possible format types please refer to:
# http://docs.python.org/lib/node357.html
#
# This is the default:
#DAEMON_LOG_MESSAGE_FORMAT = %(asctime)s - %(name)-12s: %(levelname)-8s %(message)s
#
#
######################################################################

#######################################################################
#
# DAEMON_SLEEP: when DenyHosts is run in daemon mode (--daemon flag)
# this is the amount of time DenyHosts will sleep between polling
# the SECURE_LOG.  See the comments in the PURGE_DENY section (above)
# for details on specifying this value or for complete details
# refer to:    http://denyhosts.sourceforge.net/faq.html#timespec
#
#
DAEMON_SLEEP = 30s
#
#######################################################################

#######################################################################
#
# DAEMON_PURGE: How often should DenyHosts, when run in daemon mode,
# run the purge mechanism to expire old entries in HOSTS_DENY
# This has no effect if PURGE_DENY is blank.
#
DAEMON_PURGE = 1h
#
#######################################################################

#########   THESE SETTINGS ARE SPECIFIC TO     ##########
#########       DAEMON SYNCHRONIZATION         ##########

#######################################################################
#
# Synchronization mode allows the DenyHosts daemon the ability
# to periodically send and receive denied host data such that
# DenyHosts daemons worldwide can automatically inform one
# another regarding banned hosts.   This mode is disabled by
# default, you must uncomment SYNC_SERVER to enable this mode.
#
# for more information, please refer to:
#        http:/denyhosts.sourceforge.net/faq.html#sync
#
#######################################################################

#######################################################################
#
# SYNC_SERVER: The central server that communicates with DenyHost
# daemons.  Currently, denyhosts.net is the only available server
# however, in the future, it may be possible for organizations to
# install their own server for internal network synchronization
#
# To disable synchronization (the default), do nothing.
#
# To enable synchronization, you must uncomment the following line:
#SYNC_SERVER = http://xmlrpc.denyhosts.net:9911
#
#######################################################################

#######################################################################
#
# SYNC_INTERVAL: the interval of time to perform synchronizations if
# SYNC_SERVER has been uncommented.  The default is 1 hour.
#
#SYNC_INTERVAL = 1h
#
#######################################################################

#######################################################################
#
# SYNC_UPLOAD: allow your DenyHosts daemon to transmit hosts that have
# been denied?  This option only applies if SYNC_SERVER has
# been uncommented.
# The default is SYNC_UPLOAD = yes
#
#SYNC_UPLOAD = no
#SYNC_UPLOAD = yes
#
#######################################################################

#######################################################################
#
# SYNC_DOWNLOAD: allow your DenyHosts daemon to receive hosts that have
# been denied by others?  This option only applies if SYNC_SERVER has
# been uncommented.
# The default is SYNC_DOWNLOAD = yes
#
#SYNC_DOWNLOAD = no
#SYNC_DOWNLOAD = yes
#
#
#
#######################################################################

#######################################################################
#
# SYNC_DOWNLOAD_THRESHOLD: If SYNC_DOWNLOAD is enabled this parameter
# filters the returned hosts to those that have been blocked this many
# times by others.  That is, if set to 1, then if a single DenyHosts
# server has denied an ip address then you will receive the denied host.
#
# See also SYNC_DOWNLOAD_RESILIENCY
#
#SYNC_DOWNLOAD_THRESHOLD = 10
#
# The default is SYNC_DOWNLOAD_THRESHOLD = 3
#
#SYNC_DOWNLOAD_THRESHOLD = 3
#
#######################################################################

#######################################################################
#
# SYNC_DOWNLOAD_RESILIENCY:  If SYNC_DOWNLOAD is enabled then the
# value specified for this option limits the downloaded data
# to this resiliency period or greater.
#
# Resiliency is defined as the timespan between a hackers first known
# attack and it's most recent attack.  Example:
#
# If the centralized   denyhosts.net server records an attack at 2 PM
# and then again at 5 PM, specifying a SYNC_DOWNLOAD_RESILIENCY = 4h
# will not download this ip address.
#
# However, if the attacker is recorded again at 6:15 PM then the
# ip address will be downloaded by your DenyHosts instance.
#
# This value is used in conjunction with the SYNC_DOWNLOAD_THRESHOLD
# and only hosts that satisfy both values will be downloaded.
# This value has no effect if SYNC_DOWNLOAD_THRESHOLD = 1
#
# The default is SYNC_DOWNLOAD_RESILIENCY = 5h (5 hours)
#
# Only obtain hackers that have been at it for 2 days or more:
#SYNC_DOWNLOAD_RESILIENCY = 2d
#
# Only obtain hackers that have been at it for 5 hours or more:
#SYNC_DOWNLOAD_RESILIENCY = 5h
#
#######################################################################

最后就是设置启动脚本了

cp /usr/share/denyhosts/daemon-control-dist /usr/share/denyhosts/daemon-control
chown root /usr/share/denyhosts/daemon-control
chmod 755 /usr/share/denyhosts/daemon-control
ln -s /usr/share/denyhosts/daemon-control /etc/init.d/denyhosts
chkconfig --level 345 denyhosts on

启动denyhosts

service denyhosts start

这样就安装完成了,每次开机都自动启动的,自己测试下,输入几次错误的密码.然后看看cat /etc/hosts.deny 里面是否有屏蔽的IP,再然后测试下,有屏蔽IP是否还能登录SSH和FTP.我的FTP安装的是VSFTP,其他的没测试过..