Fail2Ban日志文件中的“找到”了什么？

我在/var/log/fail2ban.log中有多个实例，如下所示：

2015-12-27 14:31:21,949 fail2ban.filter         [1020]: INFO    [sshd] Found ###.###.###.###

（其中＃代替了多种IP地址。）

该日志条目的确切含义是什么？特别是什么Found表示？

我在这里和http://www.fail2ban.org上搜索了该日志文件的说明。如果我错过了这个问题的明显信息来源，我深表歉意-请指出正确的方向。

这是/etc/fail2ban/filter.d/sshd.config中FailRegex的配置：

failregex = ^%(__prefix_line)s(?:error: PAM: )?[aA]uthentication (?:failure|error) for .* from <HOST>( via \S+)?\s*$
        ^%(__prefix_line)s(?:error: PAM: )?User not known to the underlying authentication module for .* from <HOST>\s*$
        ^%(__prefix_line)sFailed \S+ for .*? from <HOST>(?: port \d*)?(?: ssh\d*)?(: (ruser .*|(\S+ ID \S+ \(serial \d+\) CA )?\S+ %(__md5hex)s(,$
        ^%(__prefix_line)sROOT LOGIN REFUSED.* FROM <HOST>\s*$
        ^%(__prefix_line)s[iI](?:llegal|nvalid) user .* from <HOST>\s*$
        ^%(__prefix_line)sUser .+ from <HOST> not allowed because not listed in AllowUsers\s*$
        ^%(__prefix_line)sUser .+ from <HOST> not allowed because listed in DenyUsers\s*$
        ^%(__prefix_line)sUser .+ from <HOST> not allowed because not in any group\s*$
        ^%(__prefix_line)srefused connect from \S+ \(<HOST>\)\s*$
        ^%(__prefix_line)sReceived disconnect from <HOST>: 3: \S+: Auth fail$
        ^%(__prefix_line)sUser .+ from <HOST> not allowed because a group is listed in DenyGroups\s*$
        ^%(__prefix_line)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*$
        ^(?P<__prefix>%(__prefix_line)s)User .+ not allowed because account is locked<SKIPLINES>(?P=__prefix)(?:error: )?Received disconnect from$
        ^(?P<__prefix>%(__prefix_line)s)Disconnecting: Too many authentication failures for .+? \[preauth\]<SKIPLINES>(?P=__prefix)(?:error: )?Co$
        ^(?P<__prefix>%(__prefix_line)s)Connection from <HOST> port \d+(?: on \S+ port \d+)?<SKIPLINES>(?P=__prefix)Disconnecting: Too many authe$
        ^%(__prefix_line)spam_unix\(sshd:auth\):\s+authentication failure;\s*logname=\S*\s*uid=\d*\s*euid=\d*\s*tty=\S*\s*ruser=\S*\s*rhost=<HOST$

该Found xxx.xxx.xxx.xxx消息表示，fail2ban过滤器在给定的过滤器/ jail日志文件中找到与failregex匹配的行。

例如，如果日志显示

2016-03-16 15:35:51,527 fail2ban.filter         [1986]: INFO    [sshd] Found 1.2.3.4
2016-03-16 15:35:51,817 fail2ban.filter         [1986]: INFO    [sshd] Found 1.2.3.4
2016-03-16 15:35:52,537 fail2ban.actions        [1986]: NOTICE  [sshd] Ban 1.2.3.4

第两个Found意思是，在给定的sshd日志（例如/var/log/auth.log）中两次发现IP地址1.2.3.4，并且日志文件中的条目在failregex过滤器中匹配/etc/fail2ban/filter.d/sshd.conf

正如我已配置为在2个ssh-attemtps失败之后禁止使用，第三行显示，在发现这2个出现之后，IP 1.2.3.4已被禁止。

我如何发现的：

在fail2ban的python源代码中（在Debian中是/usr/lib/python3/dist-packages/fail2ban/）执行此操作：

cd /usr/lib/python3/dist-packages/fail2ban/

grep -r "\[%s\] Found" *

在第937行的python文件“ server / filter.py”中，您找到了相应的日志功能：

def processLineAndAdd(self, line, date=None):
  [..]
  logSys.info("[%s] Found %s" % (self.jail.name, ip))
  [..]