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<title> [筆記]在MAILLOG中快速找出從外部利用SASL認證發信的帳號及IP | My cool new Blog</title>
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<span class="date moment">2013-11-13</span>
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<p>找出來之後，再去判斷這個人是否有需要，是否真的會在外部發信。</p>
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<p>
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> cat maillog-20131027 |grep sasl|grep -v 192.168
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</p>
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<p>Oct 26 01:24:17 SH-DNS-FC14 postfix/smtpd[25649]: C2A1A88E5E: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:18 SH-DNS-FC14 postfix/smtpd[25645]: 931E388E5F: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:20 SH-DNS-FC14 postfix/smtpd[25645]: 9B15488E60: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:31 SH-DNS-FC14 postfix/smtpd[25645]: A957B88E69: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:32 SH-DNS-FC14 postfix/smtpd[25648]: D7D2788E6A: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:32 SH-DNS-FC14 postfix/smtpd[25649]: D9C1488E6B: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:32 SH-DNS-FC14 postfix/smtpd[25647]: DAFD188E6C: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:32 SH-DNS-FC14 postfix/smtpd[25650]: DC24988E6D: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:36 SH-DNS-FC14 postfix/smtpd[25645]: AA62088E6F: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:37 SH-DNS-FC14 postfix/smtpd[25648]: DA31F88E73: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:37 SH-DNS-FC14 postfix/smtpd[25647]: DA38088E74: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:37 SH-DNS-FC14 postfix/smtpd[25649]: DA5E988E75: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:37 SH-DNS-FC14 postfix/smtpd[25650]: E1C2888E76: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:38 SH-DNS-FC14 postfix/smtpd[25645]: E524388E77: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy
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Oct 26 01:24:40 SH-DNS-FC14 postfix/smtpd[25645]: ECC7B88E7A: client=23-24-225-177-static.hfc.comcastbusiness.net[23.24.225.177], sasl_method=LOGIN, sasl_username=cindy</p>
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<p>像這樣，短時間內大量發信，肯定就是USER的帳號密碼被猜到了，先改密碼或者把帳號砍掉，接下來封這些IP，再叫USER換一組強度高一點的密碼。</p>
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<p>如果被打得很有經驗，手邊應該會有非常多的IP要封鎖，可以參考底下這篇文章用iptables把這些IP都擋掉</p>
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<h1 id="教學-自動透過-iptables-封鎖-ip-黑名單-http-yenpai-idis-com-tw-archives-399-e6-95-99-e5-ad-b8-e8-87-aa-e5-8b-95-e9-80-8f-e9-81-8e-iptables-e5-b0-81-e9-8e-96-ip-e9-bb-91-e5-90-8d-e5-96-ae"><a href="http://yenpai.idis.com.tw/archives/399-%E6%95%99%E5%AD%B8-%E8%87%AA%E5%8B%95%E9%80%8F%E9%81%8E-iptables-%E5%B0%81%E9%8E%96-ip-%E9%BB%91%E5%90%8D%E5%96%AE">[教學] 自動透過 iptables 封鎖 IP 黑名單</a></h1>
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<p>程式不難，看一下大概就知道怎麼改了，我是改成自己手邊的黑名單(算一算也有上百個吧)….</p>
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