[Dovecot] dovecot-auth hangs with IO leak

[Alan Tam]

Hi dovecot,

I am using the debian dovecot packages on a system running LDAP.

My /etc/pam.d/common-* looks like this, which simply means try /etc/passwd first, and try LDAP using the same password if it is failed. 

account [success=1 default=ignore] pam_unix.so
account required pam_ldap.so use_first_pass
account required pam_permit.so
auth    [success=1 default=ignore] pam_unix.so
auth    required pam_ldap.so use_first_pass
auth    required pam_permit.so
session [success=1 default=ignore] pam_unix.so
session required pam_ldap.so use_first_pass
session required pam_mkhomedir.so skel=/etc/skel umask=0002
session required pam_permit.so

When many LDAP users login, /var/log/auth.log shows many (expected) error like: (note "pam_unix")
Feb  3 18:16:15 eta dovecot-auth: (pam_unix) authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=127.0.0.1
Feb  3 18:16:19 eta dovecot-auth: (pam_unix) check pass; user unknown

After recent upgrades from probably 0.99.10 to 0.99.13, these lines begin to appear in /var/log/mail.log:

Feb  3 16:31:00 eta dovecot-auth: Login process has too old (123s) requests, killing it.
Feb  3 16:31:00 eta dovecot-auth: Login process has too old (124s) requests, killing it.

And some more like this, which shows the problem:
Feb  3 16:45:23 eta dovecot-auth: I/O leak: 0x8054940 (13)
Feb  3 16:45:23 eta dovecot-auth: I/O leak: 0x8054940 (14)
Feb  3 16:45:23 eta dovecot-auth: I/O leak: 0x8054940 (15)

The problem can be solved by changing /etc/pam.d/dovecot to:
auth    required pam_ldap.so
account required pam_ldap.so
session required pam_mkhomedir.so skel=/etc/skel umask=0002
session required pam_ldap.so
This change means PAM not fail auth for /etc/passwd again.

I think dovecot has some problem dealing with the pam_unix + pam_ldap configuration. Do you have any idea?

I am Cc-ing this message to the corresponding bug in Debian BTS.

-- 
Regards,
Alan

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