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Fail2Ban 未获取 dropbear 身份验证失败

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Fail2Ban 未获取 dropbear 身份验证失败

raspbian Linux [主机名] 4.9.36+ #1015 Thu Jul 6 16:07:57 BST 2017 armv6l GNU/Linux

fail2ban 没有检测到 dropbear 身份验证失败。这适用于 openssh 没有问题。我去dropbear来减少内存使用。

这是我的 auth.log 显示日志记录正在工作

dropbear[2640]: Bad password attempt for 'username' from 192.168.1.151:50780

我的本地监狱

#dropbear shh config password

[dropbear]

enabled  = true
port     = ssh
filter   = dropbear
logpath  = /var/log/auth.log
bantime = 900
banaction = iptables-allports
findtime = 900
maxretry = 3

我的 dropbear.conf failure2ban 过滤器

[Definition]

_daemon = dropbear

# Option:  failregex
# Notes.:  regex to match the password failures messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>\S+)
# Values:  TEXT

# These match the unmodified dropbear messages. It isn't possible to
# match the source of the 'exit before auth' messages from dropbear.
#
failregex = ^%(__prefix_line)slogin attempt for nonexistent user ('.*' )?from <HOST>:.*\s*$
            ^%(__prefix_line)sbad password attempt for .+ from <HOST>:.*\s*$

# The only line we need to match with the modified dropbear.

# NOTE: The failregex below is ONLY intended to work with a patched
# version of Dropbear as described here:
# http://www.unchartedbackwaters.co.uk/pyblosxom/static/patches

和标准的监狱配置（这些选项应该用 .local 监狱覆盖）

# in /etc/fail2ban/jail.local.
#
# Optionally you may override any other parameter (e.g. banaction,
# action, port, logpath, etc) in that section within jail.local

[ssh]

enabled  = true
port     = ssh
filter   = sshd
logpath  = /var/log/auth.log
maxretry = 6

[dropbear]

enabled  = true
port     = ssh
filter   = sshd
logpath  = /var/log/dropbear
maxretry = 6

答案1

正dropbear.conf则表达式与以下条目不匹配auth.log：

Bad password attempt for...  /* auth.log */
bad password attempt for...  /* dropbear.conf */

如果您进行编辑dropbear.conf以尊重大小写，fail2ban 应该捕获记录的身份验证失败。

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