这是今天的 exim 拒绝日志：
2016-01-07 13:48:44 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 15:32:09 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 15:41:35 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 15:49:01 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 15:56:50 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:04:58 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:12:28 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:20:19 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:28:08 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:35:50 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:43:28 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:51:18 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 16:58:51 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:06:25 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:13:58 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:21:29 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:28:52 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:36:18 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:43:43 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:51:46 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 17:59:08 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:06:44 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:14:10 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:21:39 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:29:02 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:36:36 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:44:00 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:51:21 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 18:58:40 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:05:59 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:13:18 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:20:42 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:28:03 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:35:48 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:43:11 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:50:35 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 19:57:59 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 20:05:25 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 20:12:51 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 20:20:17 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 20:27:41 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
2016-01-07 20:35:06 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data ([email protected])
我不想再等待，什么也不做，是否有可能为 exim 创建一个黑名单，其中包含 1 小时内超过 10 次登录尝试的 IP 地址？
请记住，我想为 smtp 登录尝试而不是电子邮件发件人创建黑名单。
答案1
这看起来像是一次拙劣的黑客攻击。我见过几次这样的情况。
我建议使用fail2ban在多次失败时阻止 IP。您应该验证模式，因为默认模式并不总是匹配。它处理多个文件和多个服务。
Exim 确实有能力速率限制流量。有两个版本，较新的版本设计用于 ACL。这只会减慢人们试图破解您的密码的速度，但可能会鼓励他们尝试不同的服务器。如果您将速率设置得太低，可能会给合法用户带来问题。
您还可以将身份验证限制在提交端口。在提供身份验证之前，邮件部分中的一行应该要求同时使用 TLS 加密和提交端口。
auth_advertise_hosts = ${if and
{eq {$tls_cipher}{}{}{*}}
{eq {$interface_port}{587}} }