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heimdal 0.6.1rc3 had a bug causing winbindd to die, heimdal version
0.6.1 and higher have that fixed (thanks to Love from Heimdal).
SuSE has been informed about this possible pitfall, any other vendors
that ship with heimdal-0.6.1rc3 to be notified ?
Guenther
(This used to be commit 6239a5bec99c62032e0cde20679a71622dd7a059)
of this call non-critical.
Thanks to Love for the patch and explaining the inner workings of
heimdal.
Guenther
(This used to be commit 4bd9d8240b571fdd8546af4eea3f4f148987d57c)
using our own implementation of krb5_lookup_kdc with heimdal. Also,
heimdals krb5_krbhst_next() obviously does not retrieve the struct
addrinfo in the krb5_krbhst_info-struct, using
krb5_krbhst_get_addrinfo() instead.
Guenther
(This used to be commit cca660e109cc94b49ac6bf1f2802235d1d4d4383)
This memset could well have clobbered bits of the stack, because
session_key changed from
char session_key[16];
to
DATA_BLOB session_key
Andrew Bartlett
(This used to be commit 54248a405c9459f93f4200ebb0dc71748ae2fc83)
because not only does it not work on Heimdal, but also since ccaches
created within samba are memory-based, so we shouldn't touch a
FILE-based one (it was probably created via kinit or similar).
(This used to be commit 5971b0980ca8abae2208f22485c5af4c0dde0459)
bug 1208. Based on a fix from Guether Deschener.
Outstanding pieces:
- Heimdal FILE-based ccaches don't actually remove creds properly, so we
need to code a check for this
- what if ticket expires between our check and when we use it?
Guenther has coded up fixes for these parts, but I still need
to review them, as I'm not totally comfortable with the solutions.
(This used to be commit ef008b9710e682f87f0bbf526d30eb5114264233)
domains, this patch ensures that we always use the ADS backend when
security=ADS, and the remote server is capable.
The routines used for this behaviour have been upgraded to modern Samba
codeing standards.
This is a change in behaviour for mixed mode domains, and if the trusted
domain cannot be reached with our current krb5.conf file, we will show
that domain as disconnected.
This is in line with existing behaviour for native mode domains, and for
our primary domain.
As a consequence of testing this patch, I found that our kerberos error
handling was well below par - we would often throw away useful error
values. These changes move more routines to ADS_STATUS to return
kerberos errors.
Also found when valgrinding the setup, fix a few memory leaks.
While sniffing the resultant connections, I noticed we would query our
list of trusted domains twice - so I have reworked some of the code to
avoid that.
Andrew Bartlett
(This used to be commit 7c34de8096b86d2869e7177420fe129bd0c7541d)
- NTLM2 support in the server
- KEY_EXCH support in the server
- variable length session keys.
In detail:
- NTLM2 is an extension of NTLMv1, that is compatible with existing
domain controllers (unlike NTLMv2, which requires a DC upgrade).
* This is known as 'NTLMv2 session security' *
(This is not yet implemented on the RPC pipes however, so there may
well still be issues for PDC setups, particuarly around password
changes. We do not fully understand the sign/seal implications of
NTLM2 on RPC pipes.)
This requires modifications to our authentication subsystem, as we
must handle the 'challege' input into the challenge-response algorithm
being changed. This also needs to be turned off for
'security=server', which does not support this.
- KEY_EXCH is another 'security' mechanism, whereby the session key
actually used by the server is sent by the client, rather than being
the shared-secret directly or indirectly.
- As both these methods change the session key, the auth subsystem
needed to be changed, to 'override' session keys provided by the
backend.
- There has also been a major overhaul of the NTLMSSP subsystem, to merge the 'client' and 'server' functions, so they both operate on a single structure. This should help the SPNEGO implementation.
- The 'names blob' in NTLMSSP is always in unicode - never in ascii.
Don't make an ascii version ever.
- The other big change is to allow variable length session keys. We
have always assumed that session keys are 16 bytes long - and padded
to this length if shorter. However, Kerberos session keys are 8 bytes
long, when the krb5 login uses DES.
* This fix allows SMB signging on machines not yet running MIT KRB5 1.3.1. *
- Add better DEBUG() messages to ntlm_auth, warning administrators of
misconfigurations that prevent access to the privileged pipe. This
should help reduce some of the 'it just doesn't work' issues.
- Fix data_blob_talloc() to behave the same way data_blob() does when
passed a NULL data pointer. (just allocate)
REMEMBER to make clean after this commit - I have changed plenty of data structures...
(This used to be commit f3bbc87b0dac63426cda6fac7a295d3aad810ecc)
Currently I'm compiling against MIT Kerberos 1.2.8.
Anthony, you said you have a heimdal installation available. Could you
please compile this stuff with krb and check it with valgrind?
Thanks,
Volker
(This used to be commit d8ab44685994b302bb46eed9001c72c194d13dc8)
NTLMSSP with "" username, NULL password), and add --machine-pass (-P) to
all of Samba's clients.
When connecting to an Active Directory DC, you must initiate the CIFS level
session setup with Kerberos, not a guest login. If you don't, your machine
account is demoted to NT4.
Andrew Bartlett
(This used to be commit 3547cb3def45a90f99f67829a533eac1ccba5e77)
Server code *should* also work (I'll check shortly). May be the odd memory
leak. Problem was we (a) weren't setting signing on in the client krb5 sessionsetup
code (b) we need to ask for a subkey... (c). The client and server need to
ask for local and remote subkeys respectively.
Thanks to Paul Nelson @ Thursby for some sage advice on this :-).
Jeremy.
(This used to be commit 3f9e3b60709df5ab755045a093e642510d4cde00)
to add a function without an explicit #ifdef HEIMDAL which I'm trying
to avoid.
Jeremy.
(This used to be commit 92ecd0bf0fe2cc4f6c86ca48e6e458e726470a50)
the method used for checking if a domain is a trusted domain is very
crude, we should really call a backend fn of some sort. For now I'm
using winbindd to do the dirty work.
(This used to be commit adf44a9bd0d997ba4dcfadc564a29149531525af)
