BUG: Unknown command in userdb socket: CPID?2625

[Vladimir Tiukhtin]

Hi guys.

I am getting strange error:


BUG: Unknown command in userdb socket: CPID?2625


I am using service auth  to authenticate users on postfix.

*My OS*:

# cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="

*My dovecot:*

# dovecot --version
2.2.10

*My config*:

service auth {
   unix_listener auth-userdb {
     mode = 0600
     user = postfix
     group = postfix
   }
}

*My Postfix:*

# rpm -qa | grep postf
postfix-2.10.1-6.el7.x86_64

*Log*:

Mar 25 16:52:33 mail-server postfix/smtpd[2625]: connect from 
unknown[10.254.200.202]
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Debug: Loading modules 
from directory: /usr/lib64/dovecot/auth
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Debug: Module loaded: 
/usr/lib64/dovecot/auth/libdriver_mysql.so
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Debug: Module loaded: 
/usr/lib64/dovecot/auth/libdriver_sqlite.so
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Debug: Read auth token 
secret from /var/run/dovecot//auth-token-secret.dat
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Debug: master in: 
CPID        2625
Mar 25 16:52:33 mail-server dovecot[2621]: auth: Error: BUG: Unknown 
command in userdb socket: CPID?2625
Mar 25 16:52:33 mail-server postfix/smtpd[2625]: fatal: no SASL 
authentication mechanisms
Mar 25 16:52:34 mail-server postfix/master[2424]: warning: process 
/usr/libexec/postfix/smtpd pid 2625 exit status 1
Mar 25 16:52:34 mail-server postfix/master[2424]: warning: 
/usr/libexec/postfix/smtpd: bad command startup -- throttling

The interesting thing is IF I am taking off "-" (minus) from the socket 
name, everything works just perfect! So if I change config to:

service auth {
   unix_listener blabla {
     mode = 0600
     user = postfix
     group = postfix
   }
}

Mar 25 16:55:12 mail-server postfix/smtpd[2872]: connect from 
unknown[10.254.200.202]
Mar 25 16:55:12 mail-server dovecot[2786]: auth: Debug: Loading modules 
from directory: /usr/lib64/dovecot/auth
Mar 25 16:55:12 mail-server dovecot[2786]: auth: Debug: Module loaded: 
/usr/lib64/dovecot/auth/libdriver_mysql.so
Mar 25 16:55:12 mail-server dovecot[2786]: auth: Debug: Module loaded: 
/usr/lib64/dovecot/auth/libdriver_sqlite.so
Mar 25 16:55:12 mail-server dovecot[2786]: auth: Debug: Read auth token 
secret from /var/run/dovecot//auth-token-secret.dat
Mar 25 16:55:12 mail-server dovecot[2786]: auth: Debug: auth client 
connected (pid=0)
Mar 25 16:55:13 mail-server dovecot[2786]: auth: Debug: client in: 
AUTH        1        PLAIN        service=smtp nologin        
lip=192.168.101.24        rip=10.254.200.202 secured        resp=<hidden>
Mar 25 16:55:13 mail-server dovecot[2786]: auth: Debug: 
cache(admin at asergis.com,10.254.200.202): miss
Mar 25 16:55:13 mail-server dovecot[2786]: auth-worker(2878): Debug: 
Loading modules from directory: /usr/lib64/dovecot/auth
Mar 25 16:55:13 mail-server dovecot[2786]: auth-worker(2878): Debug: 
Module loaded: /usr/lib64/dovecot/auth/libdriver_mysql.so
Mar 25 16:55:13 mail-server dovecot[2786]: auth-worker(2878): Debug: 
Module loaded: /usr/lib64/dovecot/auth/libdriver_sqlite.so
Mar 25 16:55:13 mail-server dovecot[2786]: auth-worker(2878): Debug: 
sql(admin at asergis.com,10.254.200.202): query: SELECT userid AS username, 
domain, password FROM users WHERE userid = 'admin' AND domain = 
'asergis.com'
Mar 25 16:55:13 mail-server dovecot[2786]: auth: Debug: client passdb 
out: OK        1        user=admin at asergis.com
Mar 25 16:55:13 mail-server postfix/smtpd[2872]: 5C63030208: 
client=unknown[10.254.200.202], sasl_method=PLAIN, 
sasl_username=admin at asergis.com
Mar 25 16:55:13 mail-server postfix/cleanup[2881]: 5C63030208: 
message-id=<d7706aa7-a2ad-6890-5590-e6f83b5ec3af at asergis.com>
Mar 25 16:55:13 mail-server postfix/qmgr[2870]: 5C63030208: 
from=<admin at asergis.com>, size=622, nrcpt=1 (queue active)


P.s. I don't mind to use socket without minus on its name. But this 
looks really strange. Thanks. You are awesome


Vladimir

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