我正在使用带有 courier 和 mysql 的 postfix 进行身份验证。
最近我遇到了一些分段错误，导致 sasl 守护进程崩溃。这似乎与我的邮件服务器上的字典攻击有关。在日志文件中，我收到了 saslauthd 的分段错误
segfault at 0 ip 00007fe3107a3d8e sp 00007ffc2b007de8 error 4 in libc-2.19.so
- libsasl2-2 版本：
2.1.26.dfsg1-13+deb8u1 - 后缀版本：
2.11.3-1
saslauthd 配置：
START=yes
DESC="SASL Authentication Daemon"
NAME="saslauthd"
MECHANISMS="pam"
MECH_OPTIONS=""
THREADS=5
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd -r"
后缀main.cf
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
readme_directory = no
smtpd_tls_cert_file = /root/ssl/startssl/server.crt
smtpd_tls_CAfile = /root/ssl/startssl/startssl-ca-bundle.pem
smtpd_tls_key_file = /root/ssl/startssl/server.key
smtpd_use_tls=yes
smtpd_tls_received_header = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_tls_loglevel = 3
tls_random_source = dev:/dev/urandom
myhostname = ...
mydestination = localhost, localhost.localdomain
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
#smtpd
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_authenticated_header = yes
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
# virtual
virtual_alias_domains =
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, mysql:/etc/postfix/mysql-virtual_email2email.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /home/vmail
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
transport_maps = proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps
# spam/virus
content_filter = amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings
message_size_limit = 52428800
virtual_mailbox_limit = 102400000
有什么建议可以阻止 saslauthd 崩溃？
请随意发布有关我的 postfix conf 文件的其他建议/问题。
答案1
当您看到进程因段错误而停止时，调试它们的最佳方法是启用core转储。然后您可以使用gdb打印堆栈跟踪并准确查看程序崩溃的位置。
由于最近出现了安全漏洞glibc，我建议先升级glibc并重启机器。请参阅：CVE-2015-7547