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From: Bogdan Taru on 7 Jan 2008 12:10


Hello everyone,

I'm trying to make Samba authenticate clients against an Active
Directory Server running on W2k3 R2. Samba is running on a Debian Linux:

virtual-101:~# dpkg -l | egrep -i '(samba|kerb)'
ii krb5-config 1.17 Configuration
files for Kerberos Version 5
ii krb5-user 1.6.dfsg.3~beta1-2 Basic
programs to authenticate using MIT Kerberos
ii libkadm55 1.6.dfsg.3~beta1-2 MIT Kerberos
administration runtime libraries
ii libkrb53 1.6.dfsg.3~beta1-2 MIT Kerberos
runtime libraries
ii samba 3.0.28-1 a LanManager-
like file and printer server for Unix
ii samba-common 3.0.28-1 Samba common
files used by both the server and the client

This is the Samba and Kerberos configuration:

virtual-101:~# egrep -v '^(#|;|$)' /etc/samba/smb.conf
[global]
workgroup = INTERNAL
realm = INTERNAL.TESTLABOR.XX.COM
preferred master = no
server string = Samba Public Server
include = /etc/samba/dhcp.conf
dns proxy = no
log file = /var/log/samba/log.%m
log level = 5
max log size = 1000
syslog = 0
panic action = /usr/share/samba/panic-action %d
security = ADS
encrypt passwords = yes
passdb backend = tdbsam
obey pam restrictions = yes
invalid users = root
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX
\spassword:* %n\n *password\supdated\ssuccessfully* .
printcap name = cups
printing = cups
socket options = TCP_NODELAY
idmap uid = 10000-20000
idmap gid = 10000-20000
winbind enum groups = yes
winbind enum users = yes
winbind separator = +
[printers]
comment = All Printers
browseable = no
path = /var/spool/samba
printable = yes
public = no
writable = no
create mode = 0700
[print$]
comment = Printer Drivers
path = /var/lib/samba/printers
browseable = yes
read only = yes
guest ok = no
[ftp]
comment = Public FTP Resource
writable = no
locking = no
path = /home/ftp
public = yes
guest ok = no


virtual-101:~# egrep -v '^$' /etc/krb5.conf
[libdefaults]
default_realm = INTERNAL.TESTLABOR.XX.COM
default_tgs_enctypes = des-cbc-crc des-cbc-md5
default_tkt_enctypes = des-cbc-crc des-cbc-md5
permitted_enctypes = des-cbc-crc des-cbc-md5
[realms]
INTERNAL.TESTLABOR.XX.COM = {
kdc = virtual-100.internal.testlabor.xx.com
#admin_server = virtual-100.internal.testlabor.xx.com
}
[domain_realms]
.kerberos.server = INTERNAL.TESTLABOR.XX.COM


From the Samba Server, I was able to get a Kerberos ticket from the
AD:
virtual-101:~# kinit Administrator(a)INTERNAL.TESTLABOR.XX.COM
Password for Administrator(a)INTERNAL.TESTLABOR.XX.COM:
virtual-101:~# klist -e
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: Administrator(a)INTERNAL.TESTLABOR.XX.COM

Valid starting Expires Service principal
01/07/08 17:06:58 01/08/08 03:07:00 krbtgt/INTERNAL.TESTLABOR.XX.COM(a)INTERNAL.TESTLABOR.XX.COM
renew until 01/08/08 17:06:58, Etype (skey, tkt): DES cbc mode with
CRC-32, DES cbc mode with CRC-32

Kerberos 4 ticket cache: /tmp/tkt0
klist: You have no tickets cached

From the Samba Server I am able to mount a local resource, either by
using the Kerberos ticket or by authentication with a Domain User:
virtual-101:~# smbclient -k //virtual-101/ftp
OS=[Unix] Server=[Samba 3.0.28]
smb: \>
virtual-101:~# smbclient -U INTERNAL+test1 //virtual-101/ftp
Password:
Domain=[INTERNAL] OS=[Unix] Server=[Samba 3.0.28]
smb: \>

The problem is that from a Windows 2k workstation (also part of the
Domain), the mapping of the Samba resource is possible only when using
the IP adress of the Samba server ("net use y: \\10.10.0.101\ftp /
USER:INTERNAL\test1") but not when using the Hostname of the Samba
server ("net use y: \\virtual-101\ftp /USER:INTERNAL\test1"). When
using the Hostname of the Samba server, this is what Samba is logging:

...................
[2008/01/07 17:46:37, 2] smbd/sesssetup.c:setup_new_vc_session(1200)
setup_new_vc_session: New VC == 0, if NT4.x compatible we would
close all old resources.
[2008/01/07 17:46:37, 3] smbd/
sesssetup.c:reply_sesssetup_and_X_spnego(1029)
Doing spnego session setup
[2008/01/07 17:46:37, 3] smbd/
sesssetup.c:reply_sesssetup_and_X_spnego(1060)
NativeOS=[Windows 2000 2195] NativeLanMan=[Windows 2000 5.0]
PrimaryDomain=[]
[2008/01/07 17:46:37, 5] smbd/sesssetup.c:parse_spnego_mechanisms(667)
parse_spnego_mechanisms: Got OID 1 2 840 48018 1 2 2
[2008/01/07 17:46:37, 5] smbd/sesssetup.c:parse_spnego_mechanisms(667)
parse_spnego_mechanisms: Got OID 1 3 6 1 4 1 311 2 2 10
[2008/01/07 17:46:37, 3] smbd/sesssetup.c:reply_spnego_negotiate(697)
reply_spnego_negotiate: Got secblob of size 1236
[2008/01/07 17:46:37, 3] libads/
kerberos_verify.c:ads_secrets_verify_ticket(279)
ads_secrets_verify_ticket: enc type [23] failed to decrypt with
error Encryption type not permitted
[2008/01/07 17:46:37, 3] libads/kerberos_verify.c:ads_verify_ticket(427)
ads_verify_ticket: krb5_rd_req with auth failed (Encryption type
not permitted)
[2008/01/07 17:46:37, 1] smbd/sesssetup.c:reply_spnego_kerberos(316)
Failed to verify incoming ticket with error NT_STATUS_LOGON_FAILURE!
[2008/01/07 17:46:37, 3] smbd/error.c:error_packet_set(106)
error packet at smbd/sesssetup.c(318) cmd=115 (SMBsesssetupX)
NT_STATUS_LOGON_FAILURE
[2008/01/07 17:46:37, 5] lib/util.c:show_msg(484)
[2008/01/07 17:46:37, 5] lib/util.c:show_msg(494)
...................
[2008/01/07 17:46:42, 3] smbd/
sesssetup.c:reply_sesssetup_and_X_spnego(1029)
Doing spnego session setup
[2008/01/07 17:46:42, 3] smbd/
sesssetup.c:reply_sesssetup_and_X_spnego(1060)
NativeOS=[Windows 2000 2195] NativeLanMan=[Windows 2000 5.0]
PrimaryDomain=[]
[2008/01/07 17:46:42, 5] smbd/sesssetup.c:parse_spnego_mechanisms(667)
parse_spnego_mechanisms: Got OID 1 2 840 48018 1 2 2
[2008/01/07 17:46:42, 5] smbd/sesssetup.c:parse_spnego_mechanisms(667)
parse_spnego_mechanisms: Got OID 1 3 6 1 4 1 311 2 2 10
[2008/01/07 17:46:42, 3] smbd/sesssetup.c:reply_spnego_negotiate(697)
reply_spnego_negotiate: Got secblob of size 1206
[2008/01/07 17:46:42, 3] libads/
kerberos_verify.c:ads_secrets_verify_ticket(279)
ads_secrets_verify_ticket: enc type [23] failed to decrypt with
error Encryption type not permitted
[2008/01/07 17:46:42, 3] libads/kerberos_verify.c:ads_verify_ticket(427)
ads_verify_ticket: krb5_rd_req with auth failed (Encryption type
not permitted)
[2008/01/07 17:46:42, 1] smbd/sesssetup.c:reply_spnego_kerberos(316)
Failed to verify incoming ticket with error NT_STATUS_LOGON_FAILURE!
[2008/01/07 17:46:42, 3] smbd/error.c:error_packet_set(106)
error packet at smbd/sesssetup.c(318) cmd=115 (SMBsesssetupX)
NT_STATUS_LOGON_FAILURE
[2008/01/07 17:46:42, 5] lib/util.c:show_msg(484)
[2008/01/07 17:46:42, 5] lib/util.c:show_msg(494)
...................


What could be the problem? I have tried more Kerberos settings
(playing with default_tgs_enctypes/default_tkt_enctypes in /etc/
krb5.conf, trying to comment them, etc.), but nothing seems to work --
and the error messages in Samba are the same.

Any ideas would be appreciated!

Thank you,
Bogdan



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Next: Need help with SWAT