Fail2Ban 沒有發現 dropbear 身份驗證失敗

樹莓派 Linux

$$ hostname $$4.9.36+ #1015 Thu Jul 6 16:07:57 BST 2017 armv6l GNU/Linux fail2ban 沒有發現 dropbear 身份驗證失敗。這適用於 openssh 沒有問題。我去了 dropbear 以減少記憶體使用量。

這是我的 auth.log 以顯示日誌記錄正在工作

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

我的監獄.local

#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 fail2ban 過濾器

[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

以及標準的 jail.config（這些選項應該被 .local 監獄覆蓋）

# 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

正dropbear.conf則表達式與以下條目不匹配auth.log：

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

如果您編輯dropbear.conf以尊重大小寫，fail2ban 應該擷取記錄的身份驗證失敗。

引用自：https://unix.stackexchange.com/questions/378026