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Postfix / sasldb：“身份验证失败”

tag-icon • tag-icon postfix sasl saslauthd
Postfix / sasldb：“身份验证失败”

我不是 Postfix 专家...我在 Debian 11.8 上的 posfix 3.5 中遇到了身份验证问题。

我添加了一个测试用户：

# saslpasswd2 -c test
Password: test

使用 swaks 测试 Postfix 身份验证时出现以下错误：

# swaks --to root --server 172.31.0.69:25 --auth LOGIN
Username: test
Password: test
535 5.7.8 Error: authentication failed: authentication failure
*** No authentication type succeeded

日志：

postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-xxx.localdomain
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-PIPELINING
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-SIZE 10240000
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-VRFY
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-ETRN
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-AUTH CRAM-MD5 DIGEST-MD5 LOGIN PLAIN
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-AUTH=CRAM-MD5 DIGEST-MD5 LOGIN PLAIN
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-ENHANCEDSTATUSCODES
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-8BITMIME
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250-DSN
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 250 CHUNKING
postfix/smtpd[3144881]: watchdog_pat: 0x55af645786d0
postfix/smtpd[3144881]: < unknown[172.31.0.69]: AUTH LOGIN
postfix/smtpd[3144881]: xsasl_cyrus_server_first: sasl_method LOGIN
postfix/smtpd[3144881]: xsasl_cyrus_server_auth_response: uncoded server challenge: Username:
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 334 VXNlcm5hbWU6
postfix/smtpd[3144881]: < unknown[172.31.0.69]: dGVzdA==
postfix/smtpd[3144881]: xsasl_cyrus_server_next: decoded response: test
postfix/smtpd[3144881]: xsasl_cyrus_server_auth_response: uncoded server challenge: Password:
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 334 UGFzc3dvcmQ6
postfix/smtpd[3144881]: < unknown[172.31.0.69]: dGVzdA==
postfix/smtpd[3144881]: xsasl_cyrus_server_next: decoded response: test
postfix/smtpd[3144881]: warning: unknown[172.31.0.69]: SASL LOGIN authentication failed: authentication failure
postfix/smtpd[3144881]: > unknown[172.31.0.69]: 535 5.7.8 Error: authentication failed: authentication failure

通过 testsaslauthd 进行的身份验证测试有效：

# testsaslauthd -s smtp -u test -p test
0: OK "Success."

与 telnet 相同：

# telnet 172.31.0.69 25
Trying 172.31.0.69...
Connected to 172.31.0.69.
Escape character is '^]'.
220 xxx.localdomain ESMTP Postfix (Debian/GNU)
HELO xxx.com
250 xxx.localdomain
AUTH LOGIN
334 VXNlcm5hbWU6
dGVzdAo=
334 UGFzc3dvcmQ6
dGVzdAo=
535 5.7.8 Error: authentication failed: authentication failure

[主文件]

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no                                                         

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = $myhostname, localhost.$mydomain, localhost
relayhost = XXX
smtp_fallback_relay = XXX
mynetworks = 127.0.0.0/8
#inet_interfaces = loopback-only
inet_protocols = ipv4
recipient_delimiter = +

inet_interfaces = all
smtpd_relay_restrictions = permit_mynetworks
permit_sasl_authenticated reject
                                                                                
# auth
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
cyrus_sasl_config_path = /etc/postfix/sasl

debug_peer_list = 172.31.0.69

[sasl/smtpd.conf]

pwcheck_method: saslauthd
auxprop_plugin: sasldb
aslech_list: CRAM-MD5 DIGEST-MD5 LOGIN PLAIN

[/etc/default/saslauthd]

START=yes
MECHANISMS="sasldb"
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd -r"
PARAMS="-m /var/spool/postfix/var/run/saslauthd -r"

编辑1

[/etc/邮件名称]

backup6

用户：

# sasldblistusers2 
test@backup6: userPassword

编辑2

-r 在 saslauthd 配置中删除。根据文档，“-r 将领域与登录名结合起来（中间用“@”符号）。例如，登录名：“foo”领域：“bar”将作为登录名：“foo@bar”传递。请注意，领域仍将被传递，这可能会导致意外行为。“

[/etc/default/saslauthd]

START=yes
MECHANISMS="sasldb"
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd"
PARAMS="-m /var/spool/postfix/var/run/saslauthd"

然后 swaks 开始工作：

# swaks --to root --server 172.31.0.69:25 --auth LOGIN
Username: test@backup6
Password: test
[...]
235 2.7.0 Authentication successful

但是 telnet 仍然失败，用户名是 test@backup6 (base64 编码)。

答案1

正如评论中所说，用户名和该领域被发送到 SASL 库。

-r已从 saslauthd 配置中删除（意外行为；领域仍在发送），并且smtpd_sasl_local_domain可以强制测试行为。

使用此配置，swask 可以进行身份​​验证，telnet 也可以。对于 telnet，错误是 base64 编码错误（抱歉！）。提醒一下，-n在 echo 中使用不带换行符的 base64 编码：

echo -n $USERNAME | base64

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