[Dovecot] Proxy setup between two servers

[Abhijit Hoskeri]

Hi,

I am trying to set up a proxy between two dovecot servers. I have the
following set up here.

Dovecot version: 1.0.rc15
dovecot -n:
  # /etc/dovecot/dovecot.conf
  info_log_path: /var/log/dovecot.log
  log_timestamp: %Y-%m-%d %H:%M:%S
  protocols: pop3 imap
  login_dir: /var/run/dovecot/login
  login_executable(default): /usr/lib/dovecot/imap-login
  login_executable(imap): /usr/lib/dovecot/imap-login
  login_executable(pop3): /usr/lib/dovecot/pop3-login
  mail_extra_groups: mail
  mail_debug: yes
  mail_executable(default): /usr/lib/dovecot/imap
  mail_executable(imap): /usr/lib/dovecot/imap
  mail_executable(pop3): /usr/lib/dovecot/pop3
  mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
  mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
  mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
  pop3_uidl_format(default):
  pop3_uidl_format(imap):
  pop3_uidl_format(pop3): %08Xu%08Xv
  auth default:
    verbose: yes
  debug: yes
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: prefetch
 
In dovecot-ldap.conf:
  hosts = localhost
  dn = <dn>
  dnpass = <dnpass>
  sasl_bind = no
  auth_bind = yes
  ldap_version = 2
  base = <ldap-base-dn>
  pass_attrs = uid=user,userPassword=password,homeDirectory=userdb_home,uidNumber=userdb_uid,
      gidNumber=userdb_gid,mailQuota=quota,mailHost=proxy

If I set the mailHost attribute for a user as "localhost" or
"127.0.0.1", I get the following error message in syslog:

  mail.err: Sep 27 13:01:06 dovecot: auth(default): Master request 5534.1 not found  
  
and at the same time, in info_log_path (/var/log/dovecot.log), I get the
following messages:

Info: auth(default): client in: AUTH        1       PLAIN   service=IMAP    secured lip=127.0.0.1   rip=127.0.0.1   resp=<hidden>
Info: auth(default): ldap(hoskeri,127.0.0.1): bind search: base=dc=deeproot,dc=co,dc=in filter=(&(objectClass=posixAccount)(uid=hoskeri))
Info: auth(default): ldap(hoskeri,127.0.0.1): result: uid(user)=hoskeri uidNumber(userdb_uid)=1004 homeDirectory(userdb_home)=/home/hoskeri mailHost(proxy)=127.0.0.1 gidNumber(userdb_gid)=1000
Info: auth(default): ldap(hoskeri,127.0.0.1): bind: dn=uid=hoskeri,ou=People,dc=deeproot,dc=co,dc=in
Info: auth(default): client out: OK 1       user=hoskeri    proxy   pass=<hidden>

# I notice that in the above line, proxy does not any value associated with it. Can't understand why.

Info: auth(default): master in: REQUEST     1       5534    1
Info: auth(default): master out: NOTFOUND   1
Info: imap-login: Internal login failure: user=<hoskeri>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured

I have not yet tried to proxy to some other host.

Also, I have another question. In the setup I need to do, I need to use
the hostname itself for the mailhost, and not IPs, but I understand that
it is not implemented and only IP addresses are acceptable. Any major
reason why this is so? Could I help implement it?

Thanks in advance...

-Abhijit