环境
- Rackspace
- Ubuntu 12.04
- WordPress 的
- MySQL的
问题
在过去的几天里，我遇到了相当严重的内存不足问题。
尽管我解决了一个可能导致该问题的原因我仍然发现非常可疑的活动sendmail。
有什么建议可以解决这个问题吗？我认为这肯定是某种恶意软件，但我没有解决此类攻击的经验。
顶部
1 [||||||||||||||||||||||||| 27.0%] Tasks: 101, 50 thr; 1 running
2 [||||||||||||||||||||||||||||||||||||||||| 45.7%] Load average: 12.96 12.55 11.95
Mem[|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||1183/1995MB] Uptime: 09:53:28
Swp[|||| 93/2047MB]
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
19704 root 20 0 120M 25328 2896 S 2.0 1.2 0:46.16 sendmail: MTA: ./s6HH4rLv009027 gmail.co.: user open
3298 root 20 0 99M 5612 1684 S 2.0 0.3 2:46.31 sendmail: MTA: s6OABpf4003298 localhost [127.0.0.1]: DATA
3301 root 20 0 99M 5544 1684 S 2.0 0.3 2:40.89 sendmail: MTA: s6OAGAAh003301 localhost [127.0.0.1]: DATA
19510 root 20 0 26488 2568 1212 R 2.0 0.1 0:23.73 htop
771 syslog 20 0 244M 3892 516 S 1.0 0.2 2:22.43 rsyslogd -c5
1226 smmsp 20 0 133M 56328 1396 S 0.0 2.8 1:56.85 sendmail: MSP: ./s6K1OdvJ030780 [127.0.0.1]: client DATA status
32488 root 20 0 102M 7168 2748 S 0.0 0.4 0:00.02 sendmail: MTA: ./s6OAcr6I032488 aspmx.l.google.com.: client EHLO
31723 www-data 39 19 448M 72676 47276 S 0.0 3.6 0:01.14 /usr/sbin/apache2 -k start
29624 root 20 0 120M 25916 2884 S 0.0 1.3 0:29.65 sendmail: MTA: ./s6NHPdHs002287 todito.com.: user open
898 mysql 20 0 1315M 105M 3296 S 0.0 5.3 23:25.23 /usr/sbin/mysqld
30966 root 20 0 101M 5092 460 D 0.0 0.2 0:01.52 sendmail: MTA: running queue: /var/spool/mqueue
5013 mysql 20 0 1315M 105M 3296 S 0.0 5.3 0:25.58 /usr/sbin/mysqld
25504 root 20 0 120M 25904 2900 S 0.0 1.3 0:24.57 sendmail: MTA: ./s6JHcEdS028616 hotamil.com.: user open
1033 root 20 0 630M 6228 2356 S 0.0 0.3 1:17.85 /usr/local/bin/driveclient --daemon
1062 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.50 /usr/local/bin/driveclient --daemon
1082 newrelic 20 0 107M 1576 1072 S 0.0 0.1 0:46.81 /usr/sbin/nrsysmond -c /etc/newrelic/nrsysmond.cfg -p /var/run/nrsysmond.pid
1089 newrelic 20 0 107M 1576 1072 S 0.0 0.1 0:46.80 /usr/sbin/nrsysmond -c /etc/newrelic/nrsysmond.cfg -p /var/run/nrsysmond.pid
822 syslog 20 0 244M 3892 516 S 0.0 0.2 1:35.12 rsyslogd -c5
1061 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.80 /usr/local/bin/driveclient --daemon
8532 root 20 0 105M 9444 460 D 0.0 0.5 0:06.40 sendmail: MTA: running queue: /var/spool/mqueue
31711 www-data 39 19 445M 75316 52764 S 0.0 3.7 0:01.50 /usr/sbin/apache2 -k start
27927 root 20 0 120M 25904 2900 S 0.0 1.3 0:32.35 sendmail: MTA: ./s6NKLEhE005721 yahoo.co.: user open
13821 mysql 20 0 1315M 105M 3296 S 0.0 5.3 2:25.39 /usr/sbin/mysqld
31924 mysql 20 0 1315M 105M 3296 S 0.0 5.3 0:49.12 /usr/sbin/mysqld
31713 www-data 39 19 446M 68484 45496 S 0.0 3.4 0:00.79 /usr/sbin/apache2 -k start
4195 mysql 20 0 1315M 105M 3296 S 0.0 5.3 0:29.08 /usr/sbin/mysqld
9799 mysql 20 0 1315M 105M 3296 S 0.0 5.3 2:29.95 /usr/sbin/mysqld
2664 smmsp 20 0 133M 56424 1476 D 0.0 2.8 1:52.68 sendmail: MSP: ./s6K3MC7s027126 [127.0.0.1]: client DATA status
853 syslog 20 0 244M 3892 516 S 0.0 0.2 0:47.23 rsyslogd -c5
31714 www-data 39 19 446M 68404 45420 S 0.0 3.3 0:00.73 /usr/sbin/apache2 -k start
31903 mysql 20 0 1315M 105M 3296 S 0.0 5.3 0:47.96 /usr/sbin/mysqld
1063 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.40 /usr/local/bin/driveclient --daemon
31600 www-data 39 19 448M 71340 46228 S 0.0 3.5 0:00.92 /usr/sbin/apache2 -k start
4308 mysql 20 0 1315M 105M 3296 S 0.0 5.3 0:28.28 /usr/sbin/mysqld
1064 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.41 /usr/local/bin/driveclient --daemon
31727 www-data 39 19 447M 70324 45756 S 0.0 3.4 0:00.84 /usr/sbin/apache2 -k start
31725 www-data 39 19 447M 70340 45756 S 0.0 3.4 0:00.86 /usr/sbin/apache2 -k start
31724 www-data 39 19 447M 70548 45932 S 0.0 3.5 0:00.84 /usr/sbin/apache2 -k start
1715 mysql 20 0 1315M 105M 3296 S 0.0 5.3 3:05.00 /usr/sbin/mysqld
23774 root 39 19 425M 6636 4676 S 0.0 0.3 0:06.00 /usr/sbin/apache2 -k start
1065 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.35 /usr/local/bin/driveclient --daemon
1060 root 20 0 630M 6228 2356 S 0.0 0.3 0:12.43 /usr/local/bin/driveclient --daemon
F1Help F2Setup F3SearchF4FilterF5Tre
巨大的 /var/mail
root@web:/var/mail# ls -alh
total 1.2G
drwxrwsrwt 2 root mail 4.0K Jul 24 10:51 .
drwxr-xr-x 15 root root 4.0K Jul 24 00:45 ..
-rw-rw---- 1 munin mail 83K Jul 19 18:48 munin
-rw------- 1 root mail 1.1G Jul 24 10:51 root
-rw-rw---- 1 www-data mail 98M Jul 23 22:34 www-data
我的根邮件账户不断发送电子邮件
注：我已将我的域名替换为filtered.com
Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
by web.filtered.com (8.14.4/8.14.4/Debian-2ubuntu2) id s6OAqpuv010033;
Thu, 24 Jul 2014 10:52:51 GMT
Date: Thu, 24 Jul 2014 10:52:51 GMT
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <[email protected]>
To: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="s6OAqpuv010033.1406199171/web.filtered.com"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
--s6OAqpuw010033.1406199172/web.filtered.com--
From MAILER-DAEMON Thu Jul 24 10:52:53 2014
Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
by web.filtered.com (8.14.4/8.14.4/Debian-2ubuntu2) id s6OAqq6J010047;
Thu, 24 Jul 2014 10:52:53 GMT
Date: Thu, 24 Jul 2014 10:52:53 GMT
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <[email protected]>
To: postmaster
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="s6OAqq6J010047.1406199173/web.filtered.com"
Subject: Postmaster notify: see transcript for details
Auto-Submitted: auto-generated (postmaster-notification)
This is a MIME-encapsulated message
--s6OAqq6J010047.1406199173/web.filtered.com
The original message was received at Thu, 24 Jul 2014 10:52:52 GMT
from localhost
with id s6OAqq6I010047
----- The following addresses had permanent fatal errors -----
<[email protected]>
(reason: 550-5.1.1 The email account that you tried to reach does not exist. Please try)
----- Transcript of session follows -----
... while talking to aspmx.l.google.com.:
>>> RCPT To:<[email protected]>
<<< 550-5.1.1 The email account that you tried to reach does not exist. Please try
<<< 550-5.1.1 double-checking the recipient's email address for typos or
<<< 550-5.1.1 unnecessary spaces. Learn more at
<<< 550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596 sq8si14059110obc.83 - gsmtp
550 5.1.1 <[email protected]>... User unknown
>>> DATA
<<< 503 5.5.1 RCPT first. sq8si14059110obc.83 - gsmtp
--s6OAqq6J010047.1406199173/web.filtered.com
Content-Type: message/delivery-status
Reporting-MTA: dns; web.filtered.com
Received-From-MTA: DNS; localhost
Arrival-Date: Thu, 24 Jul 2014 10:52:52 GMT
Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.1.1
Remote-MTA: DNS; aspmx.l.google.com
Diagnostic-Code: SMTP; 550-5.1.1 The email account that you tried to reach does not exist. Please try
Last-Attempt-Date: Thu, 24 Jul 2014 10:52:53 GMT
--s6OAqq6J010047.1406199173/web.filtered.com
Content-Type: text/rfc822-headers
Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
by web.filtered.com (8.14.4/8.14.4/Debian-2ubuntu2) id s6OAqq6I010047;
Thu, 24 Jul 2014 10:52:52 GMT
Date: Thu, 24 Jul 2014 10:52:52 GMT
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <[email protected]>
To: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="s6OAqq6I010047.1406199172/web.filtered.com"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
--s6OAqq6J010047.1406199173/web.filtered.com--
ps -ef | grep sendmail
root@web:/var/mail# ps -ef | grep sendmail
smmsp 1226 1 0 00:45 ? 00:02:04 sendmail: MSP: ./s6KKDDVU014035 [127.0.0.1]: client DATA status
smmsp 2644 2641 0 01:00 ? 00:00:00 /bin/sh -c test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp
smmsp 2647 2644 0 01:00 ? 00:00:00 /bin/sh /usr/share/sendmail/sendmail cron-msp
smmsp 2664 2647 0 01:00 ? 00:01:58 sendmail: MSP: [127.0.0.1]: idle
root 3298 1 1 07:57 ? 00:03:16 sendmail: MTA: s6OB1dam003298 localhost [127.0.0.1]: DATA
root 3301 1 1 07:57 ? 00:03:05 sendmail: MTA: server localhost [127.0.0.1] cmd read
root 19675 1 0 11:20 ? 00:00:00 sendmail: MTA: ./s6OBKJuv019675 aspmx.l.google.com.: client DATA 354
root 19689 1 0 11:20 ? 00:00:00 sendmail: MTA: ./s6OBKLuv019689 aspmx.l.google.com.: client DATA 354
root 19800 1 0 11:20 ? 00:00:00 sendmail: MTA: ./s6OBKbuv019800 aspmx.l.google.com.: client DATA 354
root 20178 1 0 11:21 ? 00:00:00 sendmail: MTA: ./s6OBLSuv020178 aspmx.l.google.com.: client DATA 354
root 20270 1 0 11:21 ? 00:00:00 sendmail: MTA: ./s6OBLZuv020270 aspmx.l.google.com.: client DATA 354
root 20537 1 0 11:21 ? 00:00:00 sendmail: MTA: ./s6OBM0uv020537 aspmx.l.google.com.: client DATA 354
root 20646 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBM5uv020646 aspmx.l.google.com.: client DATA 354
root 21006 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMZ6I021006 aspmx.l.google.com.: client DATA 354
root 21015 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMZ6I021015 aspmx.l.google.com.: client DATA 354
root 21027 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMauv021027 aspmx.l.google.com.: client DATA 354
root 21036 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMb6I021036 aspmx.l.google.com.: client DATA 354
root 21063 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMeuv021063 aspmx.l.google.com.: client DATA 354
root 21065 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021065 aspmx.l.google.com.: client DATA 354
root 21086 1 1 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021086 aspmx.l.google.com.: client DATA 354
root 21094 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021094 aspmx.l.google.com.: client DATA 354
root 21098 1 2 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021098 aspmx.l.google.com.: client DATA 354
root 21103 1 1 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021103 aspmx.l.google.com.: client DATA 354
root 21105 1 1 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMguv021105 aspmx.l.google.com.: client DATA 354
root 21108 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OB1dag003298 mx-eu.mail.am0.yahoodns.net.: client MAIL
root 21111 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OBMg6I021111 aspmx.l.google.com.: client RCPT
root 21113 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OAsOi1003301 mx-ha03.web.de.: client greeting
root 21117 1 1 11:22 ? 00:00:00 sendmail: MTA: ./s6OAsOi3003301 gmail-smtp-in.l.google.com.: client DATA status
root 21123 1 0 11:22 ? 00:00:00 sendmail: MTA: ./s6OAsOi5003301 gmail-smtp-in.l.google.com.: client EHLO
root 21127 18604 0 11:22 pts/0 00:00:00 grep --color=auto sendmail
Sendmail 状态
root@web:/var/mail# /etc/init.d/sendmail status
MSP: is run via cron (20m)
MTA: is not running
QUE: Same as MTA
/var/spool/mqueue
root@web:/var/spool# ls -alh
total 48M
drwxr-xr-x 7 root root 4.0K Mar 29 2013 .
drwxr-xr-x 15 root root 4.0K Jul 24 00:45 ..
drwxr-xr-x 5 root root 4.0K May 1 2012 cron
lrwxrwxrwx 1 root root 7 May 1 2012 mail -> ../mail
drwxr-s--- 2 smmta smmsp 14M Jul 24 11:44 mqueue
drwxrws--- 2 smmsp smmsp 34M Jul 24 12:25 mqueue-client
drwxr-xr-x 2 root root 4.0K Apr 13 2012 plymouth
drwxr-xr-x 2 root root 4.0K Mar 30 2012 rsyslog
root@web:/var/spool# du -h -d 1
4.0K ./plymouth
1.6G ./mqueue <=====
4.0K ./rsyslog
root@web:/var/spool/mqueue# more qfs6OBTUZY003298
V8
T1406201622
K1406201622
N1
P120781
I202/1/476577
MDeferred: 421 4.7.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html
Fbs
$_localhost [127.0.0.1]
$rESMTP
$sweb.anybots.com
${daemon_flags}
${if_addr}127.0.0.1
S<[email protected]>
MDeferred: 421 4.7.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html
rRFC822; [email protected]
RPFD:<[email protected]>
H?P?Return-Path: <?g>
H??Received: from web.anybots.com (localhost [127.0.0.1])
by web.anybots.com (8.14.4/8.14.4/Debian-2ubuntu2) with ESMTP id s6OBTUZY003298
for <[email protected]>; Thu, 24 Jul 2014 11:33:42 GMT
H??Received: (from www-data@localhost)
by web.anybots.com (8.14.4/8.14.4/Submit) id s6JHVJId026134;
Sat, 19 Jul 2014 17:31:19 GMT
H??Date: Sat, 19 Jul 2014 17:31:19 GMT
H??Message-Id: <[email protected]>
H??X-Authentication-Warning: web.anybots.com: www-data set sender to [email protected] using -f
H??To: [email protected]
H??Subject: Fw: Hi Generic Drugs Online Products
H??X-PHP-Originating-Script: 33:dirs.php
H??From: "Patty Jennings" <[email protected]>
H??Reply-To:"Patty Jennings" <[email protected]>
H??X-Priority: 3 (Normal)
H??MIME-Version: 1.0
H??Content-Type: text/html; charset="iso-8859-1"
H??Content-Transfer-Encoding: 8bit
.
答案1
您的问题可能是由巨大的两个 sendmail 队列中的垃圾邮件数量。
（请参阅https://serverfault.com/a/490890/163277）
检查两个 sendmail 队列中的消息数量
sendmail -O QueueSortOrder=none -Am -bp
sendmail -O QueueSortOrder=none -Ac -bp
最耗费内存的 sendmail 进程是 MTA 队列处理 (-Am)。剩余的进程是从 MSA 到 MTA 队列的传输，以及传输后首次尝试向外部服务器投递。
您可以使用qtool.pl脚本将 www-data（Web 服务器）发送的消息移动到另一个队列/目录。该脚本在 sendmail.org 发行版的 contrib 目录中以及 Debian-Linux 的 sendmail-base 包中提供。