细节

细节

我正在尝试配置在 VirtualBox 中运行的 CentOS 7,以将其审核日志发送到 FreeBSD 10.3 主机。理想情况下,我希望接收 FreeBSD 的日志auditdistd(8)但现在我只想能够使用 netcat 来实现这一点。

我的问题是 netcat 没有获取任何数据。

细节

  1. 当我运行时,service auditd status我得到以下结果:
Redirecting to /bin/systemctl status  auditd.service
auditd.service - Security Auditing Service
   Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2016-08-19 11:35:42 CEST; 3s ago
  Process: 2216 ExecStartPost=/sbin/augenrules --load (code=exited, status=1/FAILURE)
 Main PID: 2215 (auditd)
   CGroup: /system.slice/auditd.service
           ├─2215 /sbin/auditd -n
           └─2218 /sbin/audispd

Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote was restarted
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote terminated unexpectedly
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote was restarted
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote terminated unexpectedly
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote was restarted
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote terminated unexpectedly
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote was restarted
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote terminated unexpectedly
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote has exceeded max_restarts
Aug 19 11:35:42 hephaistos audispd[2218]: plugin /sbin/audisp-remote was restarted

设置

网络设置

  1. CentOS 和 FreeBSD 在仅主机网络上连接。我已经为他们分配了以下 IP:
  • CentOS:192.168.56.101
  • 自由BSD:192.168.56.1

FreeBSD 安装

  1. 我已经让 netcat 监听端口 60:

     nc -lk 60
    

连接有效。我可以nc 192.168.56.1 60在 CentOS 上使用向 FreeBSD 发送数据。

CentOS设置

  1. 内核版本是:4.7.0-1.el7.elrepo.x86_64 #1 SMP Sun Jul 24 18:15:29 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux.

  2. Linux Audit 用户空间的版本是2.6.6。

  3. auditd 正在运行并主动记录到/var/log/audit.log.

  4. 中的审核规则/etc/audit/rules.d/配置良好。

  5. 的配置/etc/audisp/audisp-remote.conf如下所示:

     remote-server = 192.168.56.1
     port = 60
     local_port = any
     transport = tcp
     mode = immediate
    
  6. /etc/audisp/plugins.d/我在:syslog.conf和中有两个默认文件,af_unix.conf并且它们都不是活动的。我已经添加了af-remote.conf,它看起来像这样:

     # This file controls the audispd data path to the
     # remote event logger. This plugin will send events to
     # a remote machine (Central Logger).
    
     active = yes
     direction = out
     path = /sbin/audisp-remote
     type = always
     #args =
     format = string
    

这是一个修改后的例子官方存储库(链接)

  1. 以下是 的内容/etc/audisp/audispd.conf

     q_depth = 150
     overflow_action = SYSLOG
     priority_boost = 4
     max_restarts = 10
     name_format = HOSTNAME
    

如果需要,我很乐意提供更多详细信息。

答案1

我不确定这里的一切是否都是成功所必需的。尽管如此,这个配置还是有效的,因此我能够在 FreeBSD 上使用 netcat 接收 Linux 审核日志。

  1. CentOS /etc/audisp/audisp-remote.conf::

    remote_server = 192.168.56.1
    port = 60
    local_port = 60
    transport = tcp
    mode = immediate
    queue_depth = 200
    format = managed
    
  2. CentOS /etc/audisp/plugins.d/au-remote.conf::

    active = yes
    direction = out
    path = /sbin/audisp-remote
    type = always
    args = /etc/audisp/audisp-remote.conf
    format = string
    
  3. CentOS /etc/audit/auditd.conf::

    local_events = yes
    log_file = /var/log/audit/audit.log
    # Send logs to the server.  Don't save them.
    write_logs = no
    log_format = RAW
    log_group = root
    priority_boost = 8
    num_logs = 5
    disp_qos = lossy
    dispatcher = /sbin/audispd
    name_format = hostname
    max_log_file = 6
    max_log_file_action = ROTATE
    action_mail_acct = root
    space_left = 75
    space_left_action = SYSLOG
    admin_space_left = 50
    admin_space_left_action = SUSPEND
    disk_full_action = SUSPEND
    disk_error_action = SUSPEND
    
    ##tcp_listen_port =
    tcp_listen_queue = 5
    tcp_max_per_addr = 1
    use_libwrap = yes
    ##tcp_client_ports = 1024-65535
    tcp_client_max_idle = 0
    
    enable_krb5 = no
    krb5_principal = auditd
    ##krb5_key_file = /etc/audit/audit.key
    distribute_network = no
    
  4. 自由BSD /etc/hosts.allow::

     ALL : ALL : allow
    

    我不知道是否需要这个+这可能是一个坏主意。


就是这样。现在您只需nc -lk 60在 FreeBSD 和service auditd restartCentOS 上运行即可。然而,就我而言,netcat 似乎至少接收/打印每条记录两次,这似乎相当不寻常。

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