☰

纠正 postfix smtp 限制处理顺序

tag-icon • tag-icon linux email postfix
纠正 postfix smtp 限制处理顺序

我在 postfix 配置文件中有这个 smtp 限制：

smtpd_sender_restrictions = permit_sasl_authenticated, check_policy_service inet:127.0.0.1:10031,permit_mynetworks, warn_if_reject reject_non_fqdn_sender, reject_unauth_pipelining, reject_authenticated_sender_login_mismatch, reject_unknown_sender_domain

据我所知，如果permit_sasl_authenticated说特定用户已经过身份验证，那么其余限制就不会被检查？

如果我想确保permit_sasl_authenticated和check_policy_service inet:127.0.0.1:10031他们都说是，那么电子邮件才应该被传递，否则不可以，该怎么办？

实际上，我正在尝试设置 cluebringer，但是遇到了问题Sender address rejected，即使发件人通过 SASL 正确验证身份后也是如此。

这是我的postconf -n输出：

append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
disable_vrfy_command = yes
inet_interfaces = 91.91.98.67, localhost
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
mydestination = mauth.fdomain.co.uk, localhost
myhostname = mauth.fdomain.co.uk
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
readme_directory = no
recipient_delimiter = +
relay_domains = mysql:/etc/postfix/relaydomains.cf
relayhost =
smtp_bind_address = 91.91.9.7
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = mysql:/etc/postfix/authsmtp.conf
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname Freezone Internet ESMTP
smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_rbl_client sbl.spamhaus.org, reject_rbl_client blackholes.easynet.nl, reject_rbl_client bl.spamcop.net
smtpd_data_restrictions = permit_sasl_authenticated, reject_unauth_pipelining
smtpd_delay_reject = yes
smtpd_end_of_data_restrictions = check_policy_service inet:127.0.0.1:10031
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, warn_if_reject reject_non_fqdn_hostname, reject_invalid_hostname, permit
smtpd_recipient_restrictions = permit_sasl_authenticated, check_policy_service inet:127.0.0.1:10031, permit_mynetworks, reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions = permit_sasl_authenticated, check_policy_service inet:127.0.0.1:10031,permit_mynetworks, warn_if_reject reject_non_fqdn_sender, reject_unauth_pipelining, reject_authenticated_sender_login_mismatch, reject_unknown_sender_domain
smtpd_tls_CAfile = /etc/postfix/ssl/freezonewc.ca
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/postfix/ssl/freezonewc.crt
smtpd_tls_key_file = /etc/postfix/ssl/freezonewc.key
smtpd_tls_loglevel = 2
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
transport_maps = mysql:/etc/postfix/transport.cf
unknown_local_recipient_reject_code = 450

答案1

说实话，你的限制现在有点乱。postfix-users 邮件列表通常建议将所有限制收集在smtpd_recipient_restrictions或下smtpd_relay_restrictions（仅限 Postfix 2.10）。这样做的原因是它提高了可读性，并且与 并没有太大区别smtpd_delay_reject=yes。

此外，策略服务很少会回复 accept/ok 语句，而应该回复 DUNNO。因此，对于您而言，首先询问策略服务，让其有机会说 REJECT，然后检查 SASL 似乎是更好的方法，除非您的策略服务在某些情况下确实返回 OK。

在不知道您的保单服务的具体性质或您的要求的情况下，我将从以下内容开始：

smtpd_relay_restrictions =
  # subject even authenticated users and trusted networks
  # to the policy check
  check_policy_service inet:127.0.0.1:10031
  permit_mynetworks
  reject_unknown_sender_domain
  permit_sasl_authenticated
  defer_unauth_destination

smtpd_recipient_restrictions =
  permit_mynetworks
  permit_sasl_authenticated
  # we exclude our networks and SASL authenticated users
  # from all further checks.
  # since I don't know if the policy service is relevant
  # for unauthenticated mail, I commented it out here
  # check_policy_service inet:127.0.0.1:10031
  warn_if_reject reject_non_fqdn_hostname
  warn_if_reject reject_non_fqdn_sender
  reject_invalid_hostname
  reject_unknown_sender_domain

smtpd_data_restrictions = reject_unauth_pipelining

请参阅我的配置片段中的注释，以了解一些注意事项。

答案2

据我所知，如果 permit_sasl_authenticated 表示特定用户已通过身份验证，则不会检查其余限制。？

你是对的，但仅限于当前的 smtpd_xxx_restrictions

只需从 smtpd_sender_restrictions 中删除 permit_sasl_authenticated 并将所有验证移至策略服务

smtpd_sender_restrictions = check_policy_service inet:127.0.0.1:10031, ...

有以下选项可供选择

sasl_method
sasl_username
sasl_sender

如果没有 SASL 身份验证，这些属性将为空。从逻辑上讲，它可能类似于以下内容

if [ policy_service_return_code == OK && sasl_username not empty ]
   return OK
else
   return REJECT

相关内容