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Dario Lesca

2017-Dec-04 14:34 UTC

[Samba] Samba 4.7.2 + bind on Fedora 27: samba_dlz: spnego update failed

Il giorno lun, 04/12/2017 alle 12.07 +0000, Rowland Penny via samba ha
scritto:> Is the DHCP server updating the records for you ?
Yes, but for now the problem is not dhcp (see follow)
> If so, you need to stop the windows clients trying to update their
> own records, they don't own them.
I have the problem when join to domani via samba on another server, or
when I run samba_dnsupdate  --all-name 

Now I have do this test:

I have save the machine status with a snapshot.
Then I have reload a snapshot done before deploy samba AD DC.
Then, On A fresh Fedora 27 server up to date I have
Stop selinux, restart and run this command:

+ dnf install samba-client samba-dc samba-winbind attr acl krb5-
workstation tdb-tools samba-winbind-clients python bind bind-utils
samba-dc-bind-dlz

+ test '!' -e /etc/krb5.conf.orig
+ test -e /etc/krb5.conf
+ test '!' -e /etc/samba/smb.conf.orig
+ test -e /etc/samba/smb.conf

+ samba-tool domain provision --realm=dogma-to.loc --domain=dogma-to
--dns-backend=BIND9_DLZ --use-rfc2307 --server-role=dc --function-level=2008_R2
--adminpass=P at ssw0rd

Open the all port needed

cp -a /var/lib/samba/private/krb5.conf /etc/krb5.conf

Add this to the [global] of new smb.conf
 template shell = /bin/bash
 template homedir = /home/%U

Add "winbind" string to passwd, shadow and group of /etc/nsswitch.conf

Edit the /etc/named.conf and add
    listen-on port 53 { 127.0.0.1; 192.168.41.1; };
    allow-query     { localhost; 191.168.41.0/24; };
    tkey-gssapi-keytab "/var/lib/samba/bind-dns/dns.keytab";

and at the end 
    include "/var/lib/samba/bind-dns/named.conf";

without modify any other

Start and enable named
    systemctl enable named
    systemctl restart named

Point dns to my IP 192.168.41.1 and restart network

# Start samba
    systemctl enable samba
    systemctl restart samba.service

test some resolver ...

    host $(hostname)
    host -t SRV _ldap._tcp.$(hostname -d)

try access to server

    smbclient -L $(hostname)     -Uadministrator%P at aaw0rd

Try add a dns record ...

At this point All work fine

Then I try 

    samba_dnsupdate --verbose  --all-names --fail-immediately

And the problem persist:

    update failed: REFUSED
    Failed update with /tmp/tmpmRYs8r
    dic 04 15:20:21 server-addc.dogma-to.loc named[2269]: samba_dlz: starting
transaction on zone dogma-to.loc
    dic 04 15:20:21 server-addc.dogma-to.loc named[2269]: client @0x7f06840c6f20
192.168.41.1#26896: update 'dogma-to.loc/IN' denied
    dic 04 15:20:21 server-addc.dogma-to.loc named[2269]: samba_dlz: cancelling
transaction on zone dogma-to.loc

The problem is when the tools try execute this command:

    cat /tmp/tmpmRYs8r | nsupdate

    [    root at server-addc     ~]# cat /tmp/tmpmRYs8r
    server server-addc.dogma-to.loc
    update add server-addc.dogma-to.loc. 900 A 192.168.41.1
    show
    send

seem that nsupdate cannot update dns

I have add "debug" and remove "show" directive from this
file

    [    root at server-addc     ~]# cat /tmp/tmpmRYs8r
    debug
    server server-addc.dogma-to.loc
    update add server-addc.dogma-to.loc. 900 A 192.168.41.1
    send

the rerun it:

    [    root at server-addc     ~]# cat /tmp/tmpmRYs8r|nsupdate 
    Reply from SOA query:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:  16228
    ;; flags: qr aa ra; QUESTION: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
    ;; QUESTION SECTION:
    ;server-addc.dogma-to.loc.      IN      SOA

    ;; AUTHORITY SECTION:
    dogma-to.loc.           3600    IN      SOA     server-addc.dogma-to.loc.
hostmaster.dogma-to.loc. 1 900 600 86400 3600

    Found zone name: dogma-to.loc
    The master is: server-addc.dogma-to.loc
    Sending update to 192.168.41.1#53
    Outgoing update query:
    ;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id:  37799
    ;; flags:; ZONE: 1, PREREQ: 0, UPDATE: 1, ADDITIONAL: 0
    ;; UPDATE SECTION:
    server-addc.dogma-to.loc. 900   IN      A       192.168.41.1


    Reply from update query:
    ;; ->>HEADER<<- opcode: UPDATE, status: REFUSED, id:  37799
    ;; flags: qr; ZONE: 1, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0
    ;; ZONE SECTION:
    ;dogma-to.loc.                  IN      SOA

    dic 04 15:26:14 server-addc.dogma-to.loc named[2269]: samba_dlz: starting
transaction on zone dogma-to.loc
    dic 04 15:26:14 server-addc.dogma-to.loc named[2269]: client @0x7f06840c6f20
192.168.41.1#39052: update 'dogma-to.loc/IN' denied
    dic 04 15:26:14 server-addc.dogma-to.loc named[2269]: samba_dlz: cancelling
transaction on zone dogma-to.loc

Some error

Someone have some suggest?

Many thanks


-- 
Dario Lesca
(inviato dal mio Linux Fedora 27 Workstation)

Rowland Penny

2017-Dec-04 14:48 UTC

head link

[Samba] Samba 4.7.2 + bind on Fedora 27: samba_dlz: spnego update failed

On Mon, 04 Dec 2017 15:34:37 +0100
Dario Lesca via samba <samba at lists.samba.org> wrote:
> Il giorno lun, 04/12/2017 alle 12.07 +0000, Rowland Penny via samba ha
> scritto:
> > Is the DHCP server updating the records for you ?
> 
> Yes, but for now the problem is not dhcp (see follow)
> 
> > If so, you need to stop the windows clients trying to update their
> > own records, they don't own them.
> 
> I have the problem when join to domani via samba on another server, or
> when I run samba_dnsupdate  --all-name 
> 
> Now I have do this test:
> 
> I have save the machine status with a snapshot.
> Then I have reload a snapshot done before deploy samba AD DC.
> Then, On A fresh Fedora 27 server up to date I have
> Stop selinux, restart and run this command:
> 
> + dnf install samba-client samba-dc samba-winbind attr acl krb5-
> workstation tdb-tools samba-winbind-clients python bind bind-utils
> samba-dc-bind-dlz
> 
> + test '!' -e /etc/krb5.conf.orig
> + test -e /etc/krb5.conf
> + test '!' -e /etc/samba/smb.conf.orig
> + test -e /etc/samba/smb.conf
> 
> + samba-tool domain provision --realm=dogma-to.loc --domain=dogma-to
> --dns-backend=BIND9_DLZ --use-rfc2307 --server-role=dc
> --function-level=2008_R2 --adminpass=P at ssw0rd
> 
> Open the all port needed
> 
> cp -a /var/lib/samba/private/krb5.conf /etc/krb5.conf
> 
> Add this to the [global] of new smb.conf
>  template shell = /bin/bash
>  template homedir = /home/%U
> 
> Add "winbind" string to passwd, shadow and group of
/etc/nsswitch.conf
> 
> Edit the /etc/named.conf and add
>     listen-on port 53 { 127.0.0.1; 192.168.41.1; };
>     allow-query     { localhost; 191.168.41.0/24; };
>     tkey-gssapi-keytab "/var/lib/samba/bind-dns/dns.keytab";
> 
> and at the end 
>     include "/var/lib/samba/bind-dns/named.conf";
> 
> without modify any other
> 
> Start and enable named
>     systemctl enable named
>     systemctl restart named
> 
> Point dns to my IP 192.168.41.1 and restart network
> 
> # Start samba
>     systemctl enable samba
>     systemctl restart samba.service
> 
> test some resolver ...
> 
>     host $(hostname)
>     host -t SRV _ldap._tcp.$(hostname -d)
> 
> try access to server
> 
>     smbclient -L $(hostname)     -Uadministrator%P at aaw0rd
> 
> Try add a dns record ...
> 
> At this point All work fine
> 
> Then I try 
> 
>     samba_dnsupdate --verbose  --all-names --fail-immediately
> 
> And the problem persist:
> 
>     update failed: REFUSED
>     Failed update with /tmp/tmpmRYs8r
>     dic 04 15:20:21 server-addc.dogma-to.loc named[2269]: samba_dlz:
> starting transaction on zone dogma-to.loc dic 04 15:20:21
> server-addc.dogma-to.loc named[2269]: client @0x7f06840c6f20
> 192.168.41.1#26896: update 'dogma-to.loc/IN' denied dic 04 15:20:21
> server-addc.dogma-to.loc named[2269]: samba_dlz: cancelling
> transaction on zone dogma-to.loc
> 
> The problem is when the tools try execute this command:
> 
>     cat /tmp/tmpmRYs8r | nsupdate
> 
>     [    root at server-addc     ~]# cat /tmp/tmpmRYs8r
>     server server-addc.dogma-to.loc
>     update add server-addc.dogma-to.loc. 900 A 192.168.41.1
>     show
>     send
> 
> seem that nsupdate cannot update dns
> 
> I have add "debug" and remove "show" directive from
this file
> 
>     [    root at server-addc     ~]# cat /tmp/tmpmRYs8r
>     debug
>     server server-addc.dogma-to.loc
>     update add server-addc.dogma-to.loc. 900 A 192.168.41.1
>     send
> 
> the rerun it:
> 
>     [    root at server-addc     ~]# cat /tmp/tmpmRYs8r|nsupdate 
>     Reply from SOA query:
>     ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:  16228
>     ;; flags: qr aa ra; QUESTION: 1, ANSWER: 0, AUTHORITY: 1,
> ADDITIONAL: 0 ;; QUESTION SECTION:
>     ;server-addc.dogma-to.loc.      IN      SOA
> 
>     ;; AUTHORITY SECTION:
>     dogma-to.loc.           3600    IN      SOA
> server-addc.dogma-to.loc. hostmaster.dogma-to.loc. 1 900 600 86400
> 3600
> 
>     Found zone name: dogma-to.loc
>     The master is: server-addc.dogma-to.loc
>     Sending update to 192.168.41.1#53
>     Outgoing update query:
>     ;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id:  37799
>     ;; flags:; ZONE: 1, PREREQ: 0, UPDATE: 1, ADDITIONAL: 0
>     ;; UPDATE SECTION:
>     server-addc.dogma-to.loc. 900   IN      A       192.168.41.1
> 
> 
>     Reply from update query:
>     ;; ->>HEADER<<- opcode: UPDATE, status: REFUSED, id:  37799
>     ;; flags: qr; ZONE: 1, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0
>     ;; ZONE SECTION:
>     ;dogma-to.loc.                  IN      SOA
> 
>     dic 04 15:26:14 server-addc.dogma-to.loc named[2269]: samba_dlz:
> starting transaction on zone dogma-to.loc dic 04 15:26:14
> server-addc.dogma-to.loc named[2269]: client @0x7f06840c6f20
> 192.168.41.1#39052: update 'dogma-to.loc/IN' denied dic 04 15:26:14
> server-addc.dogma-to.loc named[2269]: samba_dlz: cancelling
> transaction on zone dogma-to.loc
> 
> Some error
> 
> Someone have some suggest?
> 
> Many thanks
> 
> 
If you are using the script found here:

https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records_with_BIND9

Then the records DO NOT belong to the computers, so they cannot update
them. I am also very sure that there are log records that show the
records are being updated by dhcpduser.

The cure is to STOP your windows clients trying to update their own
records.

Rowland

Dario Lesca

2017-Dec-04 15:00 UTC

head link

[Samba] Samba 4.7.2 + bind on Fedora 27: samba_dlz: spnego update failed

Il giorno lun, 04/12/2017 alle 14.48 +0000, Rowland Penny via samba ha
scritto:> 
> 
> The cure is to STOP your windows clients trying to update their own
> records.
Yes, this is true, on windows I will stop this service.

But my problem now is another

The samba command

    samba_dnsupdate --verbose  --all-names --fail-immediately

not work

It's possible to resolve this problem?
Or I have to ignore it ?

Thanks
Dario



> 
> Rowland-- 
Dario Lesca
(inviato dal mio Linux Fedora 27 Workstation)

Christian Naumer

2017-Dec-04 15:02 UTC

head link

[Samba] Samba 4.7.2 + bind on Fedora 27: samba_dlz: spnego update failed

shoudn't samba_dnsupdate work regardless on all the _srv records? Even
if the Server gets its IP by DHCP? Or is this not the case when using "
--fail-immediately"?

regards


Christian

-- 
Dr. Christian Naumer
Research Scientist
Plattform-Koordinator Bioprozesstechnik

B.R.A.I.N Aktiengesellschaft
Darmstaedter Str. 34-36, D-64673 Zwingenberg
e-mail cn at brain-biotech.de, homepage www.brain-biotech.de
fon +49-6251-9331-30  /   fax +49-6251-9331-11

Follow @BRAINbiotech on Twitter: https://twitter.com/BRAINbiotech

Sitz der Gesellschaft: Zwingenberg/Bergstrasse
Registergericht AG Darmstadt, HRB 24758
Vorstand: Dr. Juergen Eck (Vorsitzender), Frank Goebel
Aufsichtsratsvorsitzender: Dr. Ludger Mueller

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