I made some progress with the issue, but didn't solve it completely

It's basically a kind of bug (i'm not sure if it's on kerberos side or
samba, I think samba is the culprit here (?).

Microsoft uses kind of weird SPN for Hyper-V. Weird as there are
"spaces" in the string - which is kind of unique as far as SPN's go,
usually SPN form a complete string.

So I kind of just tried the simplest solution:

The workaround/fix is this:

In AD for each Hyper-V host account (machine account that is) in servicePrincipalName attribute as such:

Hyper-V\ Replica\ Service/<NetbiosName>
Hyper-V\ Replica\ Service/<FQDN>
Microsoft\ Virtual\ Console\ Service/<NetbiosName>
Microsoft\ Virtual\ Console\ Service/FQDN>
Microsoft\ Virtual\ System\ Migration\ Service/<NetbiosName>
Microsoft \Virtual\ System\ Migration\ Service/FQDN>

I edited with ADUC from RSAT suite, but I guess any method will work (samba-tool add spn or windows "setspn -S".

So basically just add \ after each part of SPN which precedes " ". With
this settings hyper-v replica and live migration from SOURCE HOST work,
but i'm stuck at Constrained Delegation.


I moved my test setup to windows server 2016 and windows server 2016
hyper-v (free).

Constrained delegation is setup (with SPN's set as above), protocol in
hyper-v is set to Kerberos, constrained delegations are used in accord
to WIndow sserver 2016 specific (in ADUC -> machine account ->
delegation -> use specific services with ANY PROTOCOL / in pre-2016 it
was Kerberos Only/ -> choose hosts and SPN's as set above).

When I'm doing live migration for VM, when logged in at source host it
works perfectly
When i'm trying to live migrate VM from remote hyper-v to the one i'm
logged in I get authentication error. The weirdest thing is the samba
log, it boggles my mind and if anyone has any idea I'll be very thankful

notes: BMSRV2$ is machine added to domain with Hyper-V with all spn's
and settings
kacper_wirski is DOMAIN USER account
and in the log there is clearly: "
/Kerberos: Server not found in database: kacper_wirski@MYDOMAIN.COM.XYZ:
No such entry in the database/*

*Which is absurd, as obviously this account exists and is all well and
fine. Relevant samba log below. When i do from console kinit kacper_wirski@MYDOMAIN.COM.XYZ i have no trouble obtaining ticket etc.
Maybe constrained delegation should be setup differently (i.e. microsoft guidelines should be implemented differently for samba AD?).
I tried with different DOMAIN ADMIN account on different host and exact
same issue with same error in log (root@MYDOMAIN.COM.XYZ: No such entry
in the database)
*
*
Kerberos: TGS-REQ BMSRV2$@MYDOMAIN.COM.XYZ from ipv4:192.168.1.8:57775
for kacper_wirski@MYDOMAIN.COM.XYZ [canonicalize, renewable, forwardable] [2017/03/18 13:24:37.782732, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: samba_kdc_fetch: message2entry failed
[2017/03/18 13:24:37.782776, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Searching referral for kacper_wirski
[2017/03/18 13:24:37.782800, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Server not found in database:
kacper_wirski@MYDOMAIN.COM.XYZ: No such entry in the database
[2017/03/18 13:24:37.782819, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed building TGS-REP to ipv4:192.168.1.8:57775
[2017/03/18 13:24:37.784201, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: TGS-REQ BMSRV2$@MYDOMAIN.COM.XYZ from
ipv4:192.168.1.8:57776 for kacper_wirski@MYDOMAIN.COM.XYZ [canonicalize, renewable, forwardable]
[2017/03/18 13:24:37.785264, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: samba_kdc_fetch: message2entry failed
[2017/03/18 13:24:37.785308, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Searching referral for kacper_wirski
[2017/03/18 13:24:37.785332, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Server not found in database:
kacper_wirski@MYDOMAIN.COM.XYZ: No such entry in the database
[2017/03/18 13:24:37.785352, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed building TGS-REP to ipv4:192.168.1.8:57776

Dnia 2017-03-16 12:17 Kacper Wirski via samba napisał(a):

Hello,

I've setup over 6 months ago samba 4 AD on centos 7.3 (self compiled
from source). Up until now I didn't encounter any undocumented errors. I
have 3 DC's (all samba 4.5.3) which are working pretty nice with over 60
windows clients.

The issue I've stumbled upon is when I added Windows server Hyper-V
hosts to the domain. Tried with Hyper-V from 2012, 2012r2 and new 2016 -
all exact same problem.

I've searched and googled and found one old topic with the same issue in
samba lists, but no help was given, but also - not enough info was
supplied.

The main issue is that Hyper-v Hosts are unable to authenticate each
other using kerberos for live migration and replication (only two
features that require kerberos) - windows host gives well documented
error, that it's unable to authenticate using kerberos.

I've gathered all the logs, which I think explain the issue quite
clearly and hopefully someone will be able to give a viable solution.

domain/realm let's call it:
mydomain.com.xyz @ MYDOMAIN.COM.XYZ
hyper-v hosts:
BM-SRV-5 and BMSRV-WIN10 (both with windows server 2016 standard with
hyper-v host role installed)
DC1, DC2, DC3 are my 3 domain controllers (names not really original
:) )

Microsoft Hyper-V requires specific SPN's registered for hosts:

*Microsoft Virtual Console Service**
**Hyper-V Replica Service**
**Microsoft Virtual System Migration Service*

The SPN's should be automatically registered in the AD machine account
by the windows, but this fails with windows error 14050. This error is
well documented, but none of the solutions helped, and I think the error
is with samba AD as I'll try to explain.

I added the SPN's manually via windows setpsn (for both hyper-v hosts
of course, mydomain.com.xyz is of course bogus name, real domain is
something different)

/setspn -S "Hyper-V Replica Service/BMSRV-WIN10" BMSRV-WIN10//
//setspn -S "Hyper-V Replica Service/BMSRV-WIN10.mydomain.com.xyz"
BMSRV-WIN10//
//
//setspn -S "Microsoft Virtual System Migration Service/BMSRV-WIN10"
BMSRV-WIN10//
//setspn -S "Microsoft Virtual System Migration
Service/BMSRV-WIN10.mydomain.com.xyz" BMSRV-WIN10//
//
//setspn -S "Microsoft Virtual Console Service/BMSRV-WIN10"
BMSRV-WIN10"//
//setspn -S "Microsoft Virtual Console
Service/BMSRV-WIN10.mydomain.com.xyz" BMSRV-WIN10//
/
Both windows and samba when queried show correct SPN's:
output of windows query:

spn -l BMSRV-WIN10

Registered ServicePrincipalNames for
CN=BMSRV-WIN10,CN=Computers,DC=mydomain,DC=com,DC=xyz:
HOST/BMSRV-WIN10
HOST/BMSRV-WIN10.mydomain.com.xyz
Hyper-V Replica Service/BMSRV-WIN10
Hyper-V Replica Service/BMSRV-WIN10.mydomain.com.xyz
Microsoft Virtual Console Service/BMSRV-WIN10
Microsoft Virtual Console Service/BMSRV-WIN10.mydomain.com.xyz
Microsoft Virtual System Migration Service/BMSRV-WIN10
Microsoft Virtual System Migration Service/BMSRV-WIN10.mydomain.com.xyz
RestrictedKrbHost/BMSRV-WIN10
RestrictedKrbHost/BMSRV-WIN10.mydomain.com.xyz
TERMSRV/BMSRV-WIN10
TERMSRV/BMSRV-WIN10.mydomain.com.xyz
WSMAN/BMSRV-WIN10
WSMAN/BMSRV-WIN10.mydomain.com.xyz

output of samba-tool query:
samba-tool spn list BMSRV-WIN10$

samba-tool spn list BMSRV-WIN10$
schema_fsmo_init: we are master[no] updates allowed[no]
User CN=BMSRV-WIN10,CN=Computers,DC=mydomain,DC=com,DC=xyz has the
following servicePrincipalName:
HOST/BMSRV-WIN10
HOST/BMSRV-WIN10.mydomain.com.xyz
Hyper-V Replica Service/BMSRV-WIN10
Hyper-V Replica Service/BMSRV-WIN10.mydomain.com.xyz
Microsoft Virtual Console Service/BMSRV-WIN10
Microsoft Virtual Console Service/BMSRV-WIN10.mydomain.com.xyz
Microsoft Virtual System Migration Service/BMSRV-WIN10
Microsoft Virtual System Migration
Service/BMSRV-WIN10.mydomain.com.xyz
RestrictedKrbHost/BMSRV-WIN10
RestrictedKrbHost/BMSRV-WIN10.mydomain.com.xyz
TERMSRV/BMSRV-WIN10
TERMSRV/BMSRV-WIN10.mydomain.com.xyz
WSMAN/BMSRV-WIN10
WSMAN/BMSRV-WIN10.mydomain.com.xyz

It looks all fine and well (the SPN names are 100% correct verified).

For the hyper-v features to work (replica and live migration) with
kerberos I need to setup delegation (it's set - verified it a milion
times over it's set the right way, just like MS wants it).

I know that I can obtain tickets to other SPN
(from windows: *klist cifs/BMSRV-WIN10* grants me a valid ticket for
example)

Now cometh the error:
When I try to run hyper-v replica it fails with error concerning
kerberos and SPN not being there

Log from samba DC3 (when trying to start Hyper-V replica from BM-SRV-5
to BMSRV-WIN.10)

Kerberos: TGS-REQ BM-SRV-5$@MYDOMAIN.COM.XYZ from
ipv4:192.168.1.10:56993 for Hyper-V\ Replica\
Service/BMSRV-WIN10.mydomain.com.xyz@MYDOMAIN.COM.XYZ [canonicalize,
renewable, forwardable]
[2017/03/16 10:55:07.246904, 4]
../source4/dsdb/samdb/cracknames.c:169(LDB_lookup_spn_alias)
LDB_lookup_spn_alias: no alias for service Hyper-V Replica Service
applicable
[2017/03/16 10:55:07.246971, 3]
../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Searching referral for BMSRV-WIN10.mydomain.com.xyz
[2017/03/16 10:55:07.247028, 3]
../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Server not found in database: Hyper-V\ Replica\
Service/BMSRV-WIN10.mydomain.com.xyz@MYDOMAIN.COM.XYZ: no such entry
found in hdb
[2017/03/16 10:55:07.247053, 3]
../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed building TGS-REP to ipv4:192.168.1.10:56993

log from wireshark (earlier attempt but same issue, this time when
trying to start live migration from BM-SRV-5 to BMSRV-WIN10):

req-body
Padding: 0
kdc-options: 40810000 (forwardable, renewable, canonicalize)
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: Microsoft Virtual System Migration Service
SNameString: BMSRV-WIN10
till: 2037-09-13 02:48:05 (UTC)
nonce: 17847174
etype: 5 items
enc-authorization-data


error:
krb-error
pvno: 5
msg-type: krb-error (30)
ctime: 2017-03-16 08:01:23 (UTC)
cusec: 128
stime: 2017-03-16 08:01:23 (UTC)
susec: 66964
error-code: eRR-S-PRINCIPAL-UNKNOWN (7)
realm: <unspecified realm>
sname
name-type: kRB5-NT-UNKNOWN (0)
sname-string: 0 items

Same errors are when going the other way round,

So the SPN's are clearly there (both setspn -l and samba-tool spn list
outputs confirm that), the client sends correct request (as seen by
wireshark and/or samba log), but suddenly samba is unable to find
the SPN.
I'm a complete newbie (well, sort-of) when it comes to kerberos and
samba, but maybe because the SPN is with spaces, as it's pretty unusual,
but that's what Microsoft wants/needs?
I don't know, just a guess :-) . The features offered by hyper-v in AD
are obviously beneficial and I would love to get them working.
Any help, workaround or tip - I will be very, very thankful. If more
info is needed I'll gladly supply logs/whatever is needed.

Kacper Wirski

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Z poważaniem,
Kacper Wirski

tel: + 48 608 421 424

Babka Medica Sp. z o.o. Sp. k.
ul. Słomińskiego 19/517, 00-195 Warszawa
Sąd Rejonowy dla M.St. Warszawy w Warszawie XII Wydział Gospodarczy KRS 0000298042
NIP 525-234-00-28

www.babkamedica.pl

----------------------------------------------------------------------------


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--- SoupGate-Win32 v1.05
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After reviewing logs I found that my previous assumption was wrong.

Situation: - i'm trying to start live migration from hyper-v host A (BMSRV4-HYPERV) to hyper-v host B (BM-SRV-5) from host B (logged in as
user from DOMAIN ADMINS group).

Kerberos constrained delegation is set in accordnance to microsoft
instructions with proper SPN's set (well, proper as in with the
workaround I wrote earlier).

Below logs from wireshark and Samba 4 DC (the one that handled request). kacper_wirski user, that belongs to DOMAIN ADMINS group is the one
"giving" the command. I tried already with different user, also tried
the other way round (from host B -> to host A when logged into host B).
Same errors. Tried with different Hyper-V host C, same error

I have bar to none experience with troubleshooting kerberos (up untli
now everything was working flawlessly) but reading from the logs I
understand that generated ticket request from Host A seems ok: it wants
to "impersonate" kacper_wirski in order to get to SPN on Host B, but
request fails.
I admit that I already googled this error and wasted a lot of hours,
but I really don't know how to handle this situation - wether it's
kerberos error, or samba error, or microsoft Hyper-V was just built
that way that it simply will work ONLY with microsoft AD?

Every bit of advice/tip is greatly appreciated, as I feel i'm running
out of ideas or options.

/etc/krb5.conf is basic generated ad DC promo. Overall no issues in the
domain using kerberos so far (over 6 months now), also used SSO for
apache so kerberos overall seems ok.

Logs below (tried my best to trim down).

Samba 4 log from DC that Host A contacted (one of 3 DC's in domain):

Log level 5
Kerberos: TGS-REQ BMSRV4-HYPERV$@MYDOMAIN.COM.XYZ from ipv4:192.168.1.14:64931 for bmsrv4-hyperv$@MYDOMAIN.COM.XYZ
[canonicalize, renewable, forwardable]
[2017/03/18 22:00:03.656232, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: s4u2self BMSRV4-HYPERV$@MYDOMAIN.COM.XYZ impersonating kacper_wirski@MYDOMAIN.COM.XYZ to service
bmsrv4-hyperv$@MYDOMAIN.COM.XYZ [forwardable]
[2017/03/18 22:00:03.656262, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: TGS-REQ authtime: 2017-03-18T21:39:30 starttime: 2017-03-18T22:00:03 endtime: 2017-03-18T22:15:03 renew till: 2017-03-25T21:39:30
[2017/03/18 22:00:03.657328, 3] ../source4/smbd/service_stream.c:66(stream_terminate_connection)
Terminating connection - 'kdc_tcp_call_loop:
tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED'
[2017/03/18 22:00:03.657340, 3] ../source4/smbd/process_single.c:114(single_terminate)
single_terminate: reason[kdc_tcp_call_loop:
tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED]
[2017/03/18 22:00:03.658763, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed to decrypt enc-authorization-data
[2017/03/18 22:00:03.658776, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed parsing TGS-REQ from ipv4:192.168.1.14:64932
[2017/03/18 22:00:03.658911, 3] ../source4/smbd/service_stream.c:66(stream_terminate_connection)
Terminating connection - 'dcesrv: NT_STATUS_CONNECTION_DISCONNECTED' [2017/03/18 22:00:03.658920, 3] ../source4/smbd/process_single.c:114(single_terminate)
single_terminate: reason[dcesrv: NT_STATUS_CONNECTION_DISCONNECTED]


Wireshark relevant output:

TGS-REQ (host A -> Samba 4 AD DC):
Kerberos
msg-type: krb-ap-req (14)

ticket
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: krbtgt
SNameString: MYDOMAIN.COM.XYZ
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
authenticator
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
PA-DATA PA-FOR-USER
padata-type: kRB5-PADATA-S4U2SELF (129)
name
name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
name-string: 1 item
KerberosString: kacper_wirski
realm: MYDOMAIN.COM.XYZ
cksum
cksumtype: cKSUMTYPE-HMAC-MD5 (-138)
auth: Kerberos
req-body
Padding: 0
kdc-options: 40810000 (forwardable, renewable, canonicalize)
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
sname-string: 1 item
SNameString: bmsrv4-hyperv$
etype: 5 items
ENCTYPE: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
ENCTYPE: eTYPE-AES128-CTS-HMAC-SHA1-96 (17)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)

TGS-REP KDC -> HOST A

tgs-rep
msg-type: krb-tgs-rep (13)
crealm: MYDOMAIN.COM.XYZ
cname
name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
cname-string: 1 item
CNameString: kacper_wirski
ticket
tkt-vno: 5
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
sname-string: 1 item
SNameString: bmsrv4-hyperv$
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno: 1
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)

TGS-REQ (Host A -> KDC)

tgs-req
pvno: 5
msg-type: krb-tgs-req (12)
padata: 2 items
PA-DATA PA-TGS-REQ
padata-type: kRB5-PADATA-TGS-REQ (1)
ticket
tkt-vno: 5
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: krbtgt
SNameString: MYDOMAIN.COM.XYZ
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno: 1
authenticator
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
PA-DATA Unknown:167
padata-type: Unknown (167)
padata-value: 3009a00703050010000000
req-body
Padding: 0
kdc-options: 40830000 (forwardable, renewable,
request-anonymous, canonicalize)
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: Microsoft Virtual System Migration Service
SNameString: BM-SRV-5
till: 2017-03-18 21:15:03 (UTC)
nonce: 478023267
etype: 5 items
ENCTYPE: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
ENCTYPE: eTYPE-AES128-CTS-HMAC-SHA1-96 (17)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)
enc-authorization-data
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
cipher: 0fa4ee9a7e16003266d7566c12c2f50748e50435090ee9e2...
additional-tickets: 1 item
Ticket
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
SNameString: bmsrv4-hyperv$
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno:
and final TGS-REP (KDC -> HOST A)
krb-error
pvno: 5
msg-type: krb-error (30)
ctime: 2017-03-18 21:00:03 (UTC)
cusec: 481
stime: 2017-03-18 21:00:03 (UTC)
susec: 658781
error-code: eRR-BAD-INTEGRITY (31)
realm: <unspecified realm>
sname
name-type: kRB5-NT-UNKNOWN (0)
sname-string: 0 items




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--- SoupGate-Win32 v1.05
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Hello,

This won't be a very helpful reply, but I can confirm I've had the exact same issue. I ran into this a few years ago and could not get HyperV migrations to work with a Samba DC. I even went so far as to install a Windows DC just to prove to myself that
it is supposed to work, and it does, perfectly (with ADDC it even creates all the SPNs for you auto-magically).

Unfortunately at the time I was focused on a Windows VM Disaster Recovery problem, so ended up dropping HyperV entirely in favour of KVM and DRBD. As such, I never raised a bug with Samba or Catalyst about this - I probably should have :-/ Sorry I can't
be of more help other than to add my voice to "there is a bug somewhere in Samba".

--
Luke Bigum
Lead Engineer

Information Systems

----- Original Message -----
From: "Kacper Wirski via samba" <samba@lists.samba.org>
To: samba@lists.samba.org
Sent: Saturday, 18 March, 2017 22:10:01
Subject: Re: [Samba] kerberos issue (SPN not found) with windows Hyper-V ( samba 4.5.3 AD)

After reviewing logs I found that my previous assumption was wrong.

Situation: - i'm trying to start live migration from hyper-v host A (BMSRV4-HYPERV) to hyper-v host B (BM-SRV-5) from host B (logged in as
user from DOMAIN ADMINS group).

Kerberos constrained delegation is set in accordnance to microsoft
instructions with proper SPN's set (well, proper as in with the
workaround I wrote earlier).

Below logs from wireshark and Samba 4 DC (the one that handled request). kacper_wirski user, that belongs to DOMAIN ADMINS group is the one
"giving" the command. I tried already with different user, also tried
the other way round (from host B -> to host A when logged into host B).
Same errors. Tried with different Hyper-V host C, same error

I have bar to none experience with troubleshooting kerberos (up untli
now everything was working flawlessly) but reading from the logs I
understand that generated ticket request from Host A seems ok: it wants
to "impersonate" kacper_wirski in order to get to SPN on Host B, but
request fails.
I admit that I already googled this error and wasted a lot of hours,
but I really don't know how to handle this situation - wether it's
kerberos error, or samba error, or microsoft Hyper-V was just built
that way that it simply will work ONLY with microsoft AD?

Every bit of advice/tip is greatly appreciated, as I feel i'm running
out of ideas or options.

/etc/krb5.conf is basic generated ad DC promo. Overall no issues in the
domain using kerberos so far (over 6 months now), also used SSO for
apache so kerberos overall seems ok.

Logs below (tried my best to trim down).

Samba 4 log from DC that Host A contacted (one of 3 DC's in domain):

Log level 5
Kerberos: TGS-REQ BMSRV4-HYPERV$@MYDOMAIN.COM.XYZ from ipv4:192.168.1.14:64931 for bmsrv4-hyperv$@MYDOMAIN.COM.XYZ
[canonicalize, renewable, forwardable]
[2017/03/18 22:00:03.656232, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: s4u2self BMSRV4-HYPERV$@MYDOMAIN.COM.XYZ impersonating kacper_wirski@MYDOMAIN.COM.XYZ to service
bmsrv4-hyperv$@MYDOMAIN.COM.XYZ [forwardable]
[2017/03/18 22:00:03.656262, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: TGS-REQ authtime: 2017-03-18T21:39:30 starttime: 2017-03-18T22:00:03 endtime: 2017-03-18T22:15:03 renew till: 2017-03-25T21:39:30
[2017/03/18 22:00:03.657328, 3] ../source4/smbd/service_stream.c:66(stream_terminate_connection)
Terminating connection - 'kdc_tcp_call_loop:
tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED'
[2017/03/18 22:00:03.657340, 3] ../source4/smbd/process_single.c:114(single_terminate)
single_terminate: reason[kdc_tcp_call_loop:
tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED]
[2017/03/18 22:00:03.658763, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed to decrypt enc-authorization-data
[2017/03/18 22:00:03.658776, 3] ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
Kerberos: Failed parsing TGS-REQ from ipv4:192.168.1.14:64932
[2017/03/18 22:00:03.658911, 3] ../source4/smbd/service_stream.c:66(stream_terminate_connection)
Terminating connection - 'dcesrv: NT_STATUS_CONNECTION_DISCONNECTED' [2017/03/18 22:00:03.658920, 3] ../source4/smbd/process_single.c:114(single_terminate)
single_terminate: reason[dcesrv: NT_STATUS_CONNECTION_DISCONNECTED]


Wireshark relevant output:

TGS-REQ (host A -> Samba 4 AD DC):
Kerberos
msg-type: krb-ap-req (14)

ticket
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: krbtgt
SNameString: MYDOMAIN.COM.XYZ
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
authenticator
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
PA-DATA PA-FOR-USER
padata-type: kRB5-PADATA-S4U2SELF (129)
name
name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
name-string: 1 item
KerberosString: kacper_wirski
realm: MYDOMAIN.COM.XYZ
cksum
cksumtype: cKSUMTYPE-HMAC-MD5 (-138)
auth: Kerberos
req-body
Padding: 0
kdc-options: 40810000 (forwardable, renewable, canonicalize)
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
sname-string: 1 item
SNameString: bmsrv4-hyperv$
etype: 5 items
ENCTYPE: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
ENCTYPE: eTYPE-AES128-CTS-HMAC-SHA1-96 (17)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)

TGS-REP KDC -> HOST A

tgs-rep
msg-type: krb-tgs-rep (13)
crealm: MYDOMAIN.COM.XYZ
cname
name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
cname-string: 1 item
CNameString: kacper_wirski
ticket
tkt-vno: 5
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
sname-string: 1 item
SNameString: bmsrv4-hyperv$
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno: 1
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)

TGS-REQ (Host A -> KDC)

tgs-req
pvno: 5
msg-type: krb-tgs-req (12)
padata: 2 items
PA-DATA PA-TGS-REQ
padata-type: kRB5-PADATA-TGS-REQ (1)
ticket
tkt-vno: 5
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: krbtgt
SNameString: MYDOMAIN.COM.XYZ
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno: 1
authenticator
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
PA-DATA Unknown:167
padata-type: Unknown (167)
padata-value: 3009a00703050010000000
req-body
Padding: 0
kdc-options: 40830000 (forwardable, renewable,
request-anonymous, canonicalize)
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-SRV-INST (2)
sname-string: 2 items
SNameString: Microsoft Virtual System Migration Service
SNameString: BM-SRV-5
till: 2017-03-18 21:15:03 (UTC)
nonce: 478023267
etype: 5 items
ENCTYPE: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
ENCTYPE: eTYPE-AES128-CTS-HMAC-SHA1-96 (17)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)
enc-authorization-data
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
cipher: 0fa4ee9a7e16003266d7566c12c2f50748e50435090ee9e2...
additional-tickets: 1 item
Ticket
realm: MYDOMAIN.COM.XYZ
sname
name-type: kRB5-NT-PRINCIPAL (1)
SNameString: bmsrv4-hyperv$
enc-part
etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
kvno:
and final TGS-REP (KDC -> HOST A)
krb-error
pvno: 5
msg-type: krb-error (30)
ctime: 2017-03-18 21:00:03 (UTC)
cusec: 481
stime: 2017-03-18 21:00:03 (UTC)
susec: 658781
error-code: eRR-BAD-INTEGRITY (31)
realm: <unspecified realm>
sname
name-type: kRB5-NT-UNKNOWN (0)
sname-string: 0 items




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To be more precise, live migration works, but only when started directly
from the hyper-v that I'm directly logged into (via RDP for example), as
in: logged into host A, I can live migrate from host A to host B, to
migrate the other way round I have to log into host B first and start
migration there.

Bug must be somewhere within kerberos constrained delegation or maybe
it's still connected to the weird hyper-v SPN's (weird as in: with
whitespaces within their names) and my proposed workaround to get
anything started (hyper-v replica and live migration with
aforementioned limitations).

I've tried to read up more on possible causes for the kerberos error,
but I'm too much of a newbie to have any chance to truly understand
what's not working. Or even if it's supposed to work at all.

Anyway I made a further test and I created a simple 2 node Hyper-V
failover cluster on top of those hyper-v hosts used earlier, and within
the cluster live migration works perfectly in every direction imagined
(when using failover cluster manager, I can live migrate VM from host a
to host b, then directly from host b to host a without changing machines
i'm logged into), but then again it is overall a lot complicated
solution which I'm not ready to use in production yet.

Overall some issues I did manage to solve, so I guess that's that. :-)


W dniu 2017-03-19 o 21:18, Luke Bigum via samba pisze:

Hello,

This won't be a very helpful reply, but I can confirm I've had the exact same issue. I ran into this a few years ago and could not get HyperV migrations to work with a Samba DC. I even went so far as to install a Windows DC just to prove to myself that

it is supposed to work, and it does, perfectly (with ADDC it even creates all the SPNs for you auto-magically).

Unfortunately at the time I was focused on a Windows VM Disaster Recovery problem, so ended up dropping HyperV entirely in favour of KVM and DRBD. As such, I never raised a bug with Samba or Catalyst about this - I probably should have :-/ Sorry I can'

t be of more help other than to add my voice to "there is a bug somewhere in Samba".



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