[Samba] Samba PDC - Kerberised CIFS access
Eduardo Sachs
edu.sachs at gmail.com
Fri Mar 13 01:16:05 GMT 2009
Shahid,
I have same problem, but, I use Domain Heimdal Kerberos, look this bug ticket:
https://bugzilla.samba.org/show_bug.cgi?id=5810
The developers have not yet responded.
Thanks!
2009/3/11 Shahid M Shaikh <shahid.shaikh at in.ibm.com>:
> Hi All,
>
> I have machine M1 hosting Samba PDC. It stores only user information.
> I have machine M2 acting as KDC server.
> I have machine M3 hosting CIFS shares and it joins into the domain hosted
> by PDC M1.
> I have machine M4 used as CIFS client.
>
> On M2, I have added users and cifs/host service principals for M3. Also
> added service principal in keytab file.
> I have added all the user and service principals using des-cbc-crc
> encryption triplet.
>
> M3 and M4 are KDC clients. I have scped the keytab file on M3 from M2.
>
> I have configured M3's smb.conf file to accept kerberos keytab and also for
> the kerberos realm.
>
> realm = SONAS.COM
> use kerberos keytab = yes
> client use spnego = yes
>
>
> >From M4, I do kinit <user> and then try to see exported shares from M3.
>
> [root at sofsedun3 ~]# kinit domuser
> Password for domuser at SONAS.COM:
> [root at sofsedun3 ~]# smbclient -L sofsedun4 -U domuser
> [root at sofsedun3 ~]# klist -e
> Ticket cache: FILE:/tmp/krb5cc_0
> Default principal: domuser at SONAS.COM
>
> Valid starting Expires Service principal
> 03/11/09 21:36:54 03/12/09 21:36:54 krbtgt/SONAS.COM at SONAS.COM
> renew until 03/11/09 21:36:54, 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
> [root at sofsedun3 ~]# smbclient -L sofsedun4 -U domuser
> Enter domuser's password:
> Anonymous login successful
> Domain=[VSOFS1.COM] OS=[Unix] Server=[Samba 3.2.8-ctdb-55]
>
> Sharename Type Comment
> --------- ---- -------
> share Disk test share
> IPC$ IPC IPC Service (Samba 3.2.8-ctdb-55)
> Anonymous login successful
> Domain=[VSOFS1.COM] OS=[Unix] Server=[Samba 3.2.8-ctdb-55]
>
> Server Comment
> --------- -------
>
> Workgroup Master
> --------- -------
>
> It works with anonymous login. But when i try to use -k it fails. I tried
> smbclient with -k and debug level 3. I get these on console.
>
> [root at sofsedun3 ~]# smbclient -d3 -L sofsedun4 -U domuser -k
> lp_load_ex: refreshing parameters
> Initialising global parameters
> params.c:pm_process() - Processing configuration file "/etc/samba/smb.conf"
> Processing section "[global]"
> added interface eth0 ip=10.0.0.23 bcast=10.0.0.255 netmask=255.255.255.0
> added interface eth1 ip=10.0.1.23 bcast=10.0.1.255 netmask=255.255.255.0
> added interface eth2 ip=10.0.2.23 bcast=10.0.2.255 netmask=255.255.255.0
> Client started (version 3.2.8-ctdb-55).
> Connecting to 10.0.0.24 at port 445
> Doing spnego session setup (blob length=111)
> got OID=1 2 840 113554 1 2 2
> got OID=1 2 840 48018 1 2 2
> got OID=1 3 6 1 4 1 311 2 2 10
> got principal=cifs/sofsedun4.vsofs1.com at SONAS.COM
> Doing kerberos session setup
> ads_cleanup_expired_creds: Ticket in ccache[FILE:/tmp/krb5cc_0] expiration
> Thu, 12 Mar 2009 21:36:54 TLT
> cli_session_setup_blob: receive failed (NT_STATUS_LOGON_FAILURE)
> SPNEGO login failed: Logon failure
> session setup failed: NT_STATUS_LOGON_FAILURE
> [root at sofsedun3 ~]# klist -e
> Ticket cache: FILE:/tmp/krb5cc_0
> Default principal: domuser at SONAS.COM
>
> Valid starting Expires Service principal
> 03/11/09 21:36:54 03/12/09 21:36:54 krbtgt/SONAS.COM at SONAS.COM
> renew until 03/11/09 21:36:54, Etype (skey, tkt): DES cbc mode with
> CRC-32, DES cbc mode with CRC-32
> 03/11/09 21:39:15 03/12/09 21:36:54 cifs/sofsedun4.vsofs1.com at SONAS.COM
> renew until 03/11/09 21:36:54, 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
>
>
> On M3, I have enabled smbd logs with debug level 10. The corresponding
> errors for the above behavior are:
>
> [2009/03/11 21:58:54, 3] smbd/process.c:switch_message(1361)
> switch message SMBsesssetupX (pid 26858) conn 0x0
> [2009/03/11 21:58:54, 3] smbd/sec_ctx.c:set_sec_ctx(324)
> setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2009/03/11 21:58:54, 3] smbd/sesssetup.c:reply_sesssetup_and_X(1409)
> wct=12 flg2=0xc801
> [2009/03/11 21:58:54, 3]
> smbd/sesssetup.c:reply_sesssetup_and_X_spnego(1173)
> Doing spnego session setup
> [2009/03/11 21:58:54, 3]
> smbd/sesssetup.c:reply_sesssetup_and_X_spnego(1208)
> NativeOS=[Unix] NativeLanMan=[Samba] PrimaryDomain=[]
> [2009/03/11 21:58:54, 3] smbd/sesssetup.c:reply_spnego_negotiate(800)
> reply_spnego_negotiate: Got secblob of size 466
> [2009/03/11 21:58:54, 3]
> libads/kerberos_verify.c:ads_secrets_verify_ticket(282)
> ads_secrets_verify_ticket: enc type [1] failed to decrypt with error
> Decrypt integrity check failed
> [2009/03/11 21:58:54, 3]
> libads/kerberos_verify.c:ads_keytab_verify_ticket(171)
> ads_keytab_verify_ticket: krb5_rd_req failed for all 2 matched keytab
> principals
> [2009/03/11 21:58:54, 3] libads/kerberos_verify.c:ads_verify_ticket(458)
> ads_verify_ticket: krb5_rd_req with auth failed (Bad encryption type)
> [2009/03/11 21:58:54, 1] smbd/sesssetup.c:reply_spnego_kerberos(350)
> Failed to verify incoming ticket with error NT_STATUS_LOGON_FAILURE!
> [2009/03/11 21:58:54, 3] smbd/error.c:error_packet_set(61)
> error packet at smbd/sesssetup.c(352) cmd=115 (SMBsesssetupX)
> NT_STATUS_LOGON_FAILURE
> [2009/03/11 21:58:54, 3] smbd/process.c:smbd_process(2036)
> receive_message_or_smb failed: NT_STATUS_END_OF_FILE, exiting
> [2009/03/11 21:58:54, 3] smbd/sec_ctx.c:set_sec_ctx(324)
> setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2009/03/11 21:58:54, 3] smbd/connection.c:yield_connection(31)
> Yielding connection to
> [2009/03/11 21:58:54, 3] smbd/server.c:exit_server_common(958)
> Server exit (normal exit)
>
>
>
> In the above scenario, M1 and M2 are not aware about each other. That
> means, M1 is not kerberos client.
> I tried setting M1 as kerberos client as well. But the result was the same.
>
> Samba installed on M1, M3 and M4 is samba-3.2.8_ctdb_55-1.
> I am using MIT Kerberos version 1.6.1-25.el5 on KDC and kerberos clients.
>
>
> My queries are:
> 1. Is it a know issue with samba or kerberos?
> 2. Am I missing anything on configuration?
> 3. What should I do to make the above setup working?
>
>
> Please feel free to ask for more information if the provided one is not
> sufficient.
>
>
> P.S.: I am copying my configuration files here for reference.
>
>
>
>
> [root at sofsedun2 ~]# cat /etc/samba/smb.conf
> # Samba Configuration file.
> #
> # ****************** WARNING ********************************
> # The contents of this file should not be modified directly !
> #
> # The samba options are stored in the registry.
> # Use the "net conf" command to add/modify samba options in the registry
> # ***************************************************************
> [global]
> workgroup = VSOFS1.COM
> server string = Samba/NT PDC
> netbios name = sofsedun2
> passdb backend = tdbsam
> log level = 3
> log file = /var/log/samba/%m.log
> max log size = 50
> delete user script = /usr/sbin/userdel "%u"
> add group script = /usr/sbin/groupadd "%g"
> delete group script = /usr/sbin/groupdel "%g"
> delete user from group script = /usr/sbin/userdel "%u" "%g"
> add machine script = /usr/sbin/useradd -n -c "Workstation (%u)" -M
> -d /nohome -s /bin/false "%u"
> add user script = /usr/sbin/useradd -n -c "Workstation (%u)" -M -d
> /nohome -s /bin/false "%u"
> domain logons = Yes
> os level = 64
> preferred master = Yes
> domain master = Yes
> local master = Yes
> wins support = Yes
> cups options = raw
> security = user
> encrypt passwords = Yes
> [netlogon]
> path = /etc/samba/netlogon
> writeable = no
> write list = ntadmin
> guest ok = no
> [profiles]
> path = /usr/smb/ntprofile
> writeable = yes
> create mask = 0600
> directory mask = 0700
>
>
>
> 2. CIFS server smb.conf
> [root at sofsedun4 ~]# cat /etc/samba/smb.conf
> # Samba Configuration file.
> #
> # ****************** WARNING ********************************
> # The contents of this file should not be modified directly !
> #
> # The samba options are stored in the registry.
> # Use the "net conf" command to add/modify samba options in the registry
> # ***************************************************************
> [global]
> workgroup = VSOFS1.COM
> password server = sofsedun2
> security = domain
> idmap uid = 16777216-33554431
> idmap gid = 16777216-33554431
> template shell = /bin/sh
> winbind use default domain = false
> winbind offline logon = false
> realm = SONAS.COM
> use kerberos keytab = yes
> client use spnego = yes
> wins support = Yes
> cups options = raw
> log level = 3
> log file = /var/log/samba/%m.log
> [share]
> comment = test share
> path = /home/share
> read only = no
> public = yes
> valid users = 'VSOFS1.COM\domuser' 'VSOFS1.COM\domadmin'
> 'VSOFS1.COM\domguest'
>
>
>
>
> [root at sofsedutsm ~]# cat /var/kerberos/krb5kdc/kdc.conf
> [kdcdefaults]
> v4_mode = nopreauth
> kdc_tcp_ports = 88
>
> [realms]
> SONAS.COM = {
> #master_key_type = des3-hmac-sha1
> acl_file = /var/kerberos/krb5kdc/kadm5.acl
> dict_file = /usr/share/dict/words
> admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab
> supported_enctypes = des3-hmac-sha1:normal arcfour-hmac:normal
> des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal des-cbc-crc:v4
> des-cbc-crc:afs3
> }
>
>
>
> [root at sofsedun3 ~]# cat /etc/krb5.conf
> [logging]
> default = FILE:/var/log/krb5libs.log
> kdc = FILE:/var/log/krb5kdc.log
> admin_server = FILE:/var/log/kadmind.log
>
> [libdefaults]
> default_realm = SONAS.COM
> dns_lookup_realm = true
> dns_lookup_kdc = true
> ticket_lifetime = 24h
> forwardable = yes
> default_tkt_enctypes = des-cbc-crc des-cbc-md5
> default_tgs_enctypes = des-cbc-crc des-cbc-md5
>
> [realms]
> VSOFS1.COM = {
> kdc = sofsedutsm.VSOFS1.COM
> }
> SONAS.COM = {
> kdc = sofsedutsm.VSOFS1.COM:88
> admin_server = sofsedutsm.VSOFS1.COM:749
> default_domain = VSOFS1.COM
> }
>
> [domain_realm]
> .VSOFS1.COM = SONAS.COM
> VSOFS1.COM = SONAS.COM
>
> [appdefaults]
> pam = {
> debug = false
> ticket_lifetime = 36000
> renew_lifetime = 36000
> forwardable = true
> krb4_convert = false
> }
>
>
> 5. /etc/nsswitch.conf and /etc/pam.d/system-auth have been configured to
> use winbind for auth, account and passwords.
>
>
>
> [root at sofsedun4 ~]# klist -kte
> Keytab name: FILE:/etc/krb5.keytab
> KVNO Timestamp Principal
> ---- -----------------
> --------------------------------------------------------
> 3 03/11/09 20:24:49 cifs/sofsedun2.vsofs1.com at SONAS.COM (DES cbc mode
> with CRC-32)
> 3 03/11/09 20:25:05 host/sofsedun2.vsofs1.com at SONAS.COM (DES cbc mode
> with CRC-32)
> 3 03/11/09 20:25:19 host/sofsedun4.vsofs1.com at SONAS.COM (DES cbc mode
> with CRC-32)
> 3 03/11/09 20:25:36 cifs/sofsedun4.vsofs1.com at SONAS.COM (DES cbc mode
> with CRC-32)
> [root at sofsedun4 ~]#
>
>
> Regards,
> Shahid Shaikh.
>
> --
> To unsubscribe from this list go to the following URL and read the
> instructions: https://lists.samba.org/mailman/options/samba
>
More information about the samba
mailing list