[CentOS] Dovecot & pam issues

Mike Watson mikew at crucis.net
Fri Oct 5 20:17:53 EDT 2012


I'm replacing my old Fedora 7 mail server with a new one running 
CentOS6.3. The old server uses plain-text logins and password for pop3 
and IMAP.

I'm unable to get dovecot to authenticate. It's failing the password check.

Trying 192.168.1.50...
Connected to orion (192.168.1.50).
Escape character is '^]'.
+OK orion.crucis.net Dovecot ready.
user joe
+OK
pass abcdefg
-ERR Authentication failed.
quit
+OK Logging out
Connection closed by foreign host.

However, another user on the same system works!

Trying 192.168.1.50...
Connected to orion (192.168.1.50).
Escape character is '^]'.
+OK orion.crucis.net Dovecot ready.
user bob
+OK
pass jklmnop
+OK Logged in.
quit
+OK Logging out.
Connection closed by foreign host.

I'm looping through eth0 in both of the above. The results are the same 
if I telnet from 192.168.1.30.

User bob was the one I created on the initial CentOS install, joe was 
added later.

Here is the extract from maillog.

Oct 4 15:54:12 orion dovecot: auth: pam(joe,192.168.1.30): 
pam_authenticate() failed: Auth
authentication failure (password mismatch?) (given password:abcdefg)
Oct 4 15:54:14 orion dovecot: auth: Debug: client out: FAIL#0113#011user=joe
Oct 4 15:54:14 orion dovecot: IMAP-login: Disconnected (auth failed, 3 
attempts): user=<joe
1>, method=PLAIN, rip=192.168.1.30, lip=192.168.1.50
Oct 4 15:54:14 orion dovecot: auth: Debug: client out: 
CONT#0112#011VXNlcm5hbWU6
Oct 4 15:54:14 orion dovecot: auth: Debug: client in: CONT#0112#011Y3J1Y2lz
Oct 4 15:54:14 orion dovecot: auth: Debug: client out: 
CONT#0112#011UGFzc3dvcmQ6
Oct 4 15:54:14 orion dovecot: auth: Debug: client in: 
CONT#0112#011dzB0bXcvMA==
Oct 4 15:54:14 orion dovecot: auth: Debug: pam(joe,192.168.1.30): lookup 
service=dovecot
Oct 4 15:54:14 orion dovecot: auth: Debug: pam(joe,192.168.1.30): #1/1 
style=1 msg=Passwor
d:
Oct 4 15:54:16 orion dovecot: auth: pam(crucis,192.168.1.30): 
pam_authenticate() failed: Auth
entication failure (password mismatch?) (given password: abcdefg)

Here's the output from dovecot -n

# 2.0.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-279.5.2.el6.x86_64 x86_64 CentOS release 6.3 (Final)
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
listen = *
login_greeting = orion.crucis.net Dovecot ready.
mail_location = mbox:~/mail:INBOX=/var/mail/%u
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex IMAP4flags copy include variables body enotify 
environment mailbox date
mbox_write_locks = fcntl
passdb {
args = session=yes dovecot
driver = pam
}
plugin {
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
}
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
driver = passwd
}
protocol pop3 {
pop3_client_workarounds = outlook-no-nuls
pop3_uidl_format = %08Xu%08Xv
}

Any suggestion how I get dovecot and pam working? Or, is the problem 
elsewhere?

mw

-- 
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