我想让带有 sendmail 和 dovecot 的 cinfugiure centos 6.4 服务器进行 SMTP-AUTH，我配置了 saslauthd 和 sendmail，但 SMTP-AUTH 不起作用，实际配置是
[root@server sasl2]# rpm -qa | grep sendmail sendmail-8.14.4-8.el6.x86_64 sendmail-cf-8.14.4-8.el6.noarch
[root@server sasl2]# sendmail -d0.1 -bv
Version 8.14.4
Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS
TCPWRAPPERS USERDB USE_LDAP_INIT
============ SYSTEM IDENTITY (after readcf) ============
(short domain name) $w = server
(canonical domain name) $j = server.itzena.cz
(subdomain name) $m = itzena.cz
(node name) $k = server.itzena.cz
========================================================
Recipient names must be specified
[root@server sasl2]# grep -v ^dnl /etc/mail/sendmail.mc
divert(-1)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`setup for linux')dnl
OSTYPE(`linux')dnl
define(`confDEF_USER_ID', ``8:12'')dnl
define(`confTO_CONNECT', `1m')dnl
define(`confTRY_NULL_MX_LIST', `True')dnl
define(`confDONT_PROBE_INTERFACES', `True')dnl
define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl
define(`ALIAS_FILE', `/etc/aliases')dnl
define(`STATUS_FILE', `/var/log/mail/statistics')dnl
define(`UUCP_MAILER_MAX', `2000000')dnl
define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
define(`confAUTH_OPTIONS', `A')dnl
define(`confAUTH_OPTIONS', `A p')dnl
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confTO_IDENT', `0')dnl
FEATURE(`no_default_msa', `dnl')dnl
FEATURE(`smrsh', `/usr/sbin/smrsh')dnl
FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl
FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
FEATURE(`blacklist_recipients')dnl
EXPOSED_USER(`root')dnl
FEATURE(`accept_unresolvable_domains')dnl
LOCAL_DOMAIN(`localhost.localdomain')dnl
MAILER(smtp)dnl
MAILER(procmail)dnl
[root@server sasl2]# saslauthd -v
saslauthd 2.1.23
authentication mechanisms: getpwent kerberos5 pam rimap shadow ldap
[root@server sasl2]# cat /etc/sasl2/Sendmail.conf
pwcheck_method:saslauthd
mech_list: PLAIN LOGIN
[root@server sasl2]# telnet localhost 25
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 server.itzena.cz ESMTP Sendmail 8.14.4/8.14.4; Sat, 6 Jul 2013 14:58:49 +0200
ehlo localhost
250-server.itzena.cz Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
我有取消注释的行
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
但如果
[root@server ~]# telnet localhost 25
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 server.itzena.cz ESMTP Sendmail 8.14.4/8.14.4; Sun, 7 Jul 2013 09:17:08 +0200
ehlo localhost
250-server.itzena.cz Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
AUTH LOGIN
503 5.3.3 AUTH not available
答案1
您的 m4 中目前有两条相互矛盾的线：
define(`confAUTH_OPTIONS', `A')dnl
define(`confAUTH_OPTIONS', `A p')dnl
假设第二个优先，该p标志告诉 sendmail 除非加密到位，否则不要提供身份验证，这意味着您需要启动并运行 TLS 才能获得身份验证。以下是与我的邮件服务器进行的一对可比较的对话。第一个是明文形式，使用telnet：
[me@risby iplayer]$ telnet www.teaparty.net 25
Trying 2a01:8000:0:4::1:1...
Connected to www.teaparty.net.
Escape character is '^]'.
220 : ESMTP you accept terms at http://www.teaparty.net/smtp.html
ehlo me
250-lory.teaparty.net Hello [IPv6:2001:4d48:ad51:3500:7271:bcff:feac:445a], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE 14000000
250-ETRN
250-STARTTLS
250-DELIVERBY
250 HELP
quit
221 2.0.0 lory.teaparty.net closing connection
Connection closed by foreign host.
由于这是纯文本连接，因此不提供身份验证。现在我将尝试使用openssl建立启用 TLS 的连接：
[me@risby iplayer]$ openssl s_client -connect www.teaparty.net:25 -starttls smtp
CONNECTED(00000003)
[much crypto stuff deleted]
250 HELP
ehlo me
250-lory.teaparty.net Hello [IPv6:2001:4d48:ad51:3500:7271:bcff:feac:445a], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE 14000000
250-ETRN
250-AUTH LOGIN PLAIN
250-DELIVERBY
250 HELP
quit
221 2.0.0 lory.teaparty.net closing connection
注意选项是如何AUTH提供的。我注意到，除了告诉 sendmail 仅AUTH在加密到位时提供之外，您还没有配置 TLS；您需要先配置它，然后才能测试是否提供 AUTH。在 sendmail 下配置 TLS 超出了这个问题的范围，但 SF 上已经有答案可以帮助解决这个问题。
答案2
打开/etc/mail/sendmail.mc。
查找以下行：
dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
通过删除“dnl”来取消注释。
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
保存文件并使用 重新启动 sendmail service sendmail restart。如果这不起作用，当您尝试进行身份验证时您会看到什么？