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another NTLMv2 combination.
We should allow the NTLMv2 response to be calculated with either the domain
as supplied, or the domain in UPPER case (as we always did in the past).
As a client, we always UPPER case it (as per the spec), but we also
make sure to UPPER case the domain, when we send it. This should give
us maximum compatability.
Andrew Bartlett
ago.
This patch re-adds support for 'optional' SMB signing. It also ensures that
we are much more careful about when we enable signing, particularly with
on-the-fly smb.conf reloads.
The client code will now attempt to use smb signing by default, and disable
it if the server doesn't correctly support it.
Andrew Bartlett
Winbind tickets expired. We now check the expiration time, and acquire
new tickets. We couln't rely on renewing them, because if we didn't get
a request before they expired, we wouldn't have renewed them. Also, there
is a one-week limit in MS on renewal life, so new tickets would have been
needed after a week anyway. Default is 10 hours, so we should only be
acquiring them that often, unless the configuration on the DC is changed (and
the minimum is 1 hour).
- setup_logging() in smbclient to be interactive (remove the timestamps)
- Fix bad return value in pull_ucs2( needs more testing to make sure this
didn't break something else) that caused clistr_pull() to always read
the same string from the buffer (pull_usc2() could return -1 if the original
source length was given as -1)
- increment some debugging messages to avoid printing them out so often
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
solves the problem for me here, I can still successfully set up signing using
NTLMSSP against w2k3 and it does not show a signing error anymoe when the
password was wrong.
Jeremy, you might want to take a further look at it as this is not
particularly elegant.
Volker
- 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...
portion of NTLMv2 key exchange. Also revert the default for
'client ntlmv2 auth' to no. This caused no ends of grief in
different cases.
And based on abartlet's mail....
> All I care about at this point is that we use NTLMv2
> in our client code when connecting to a server that
> supports it.
There is *no* way to tell this. The server can't tell us, because it
doesn't know what it's DC supports. The DC can't tell us, because it
doesn't know what the trusted DC supports. One DC might be Win2k, and
the PDC could be an older NT4.
elsewhere in the code. This will allow us to try kerberos, then another user
then guest in the winbindd code.
Also, re-introduce the seperate, NT1 'guest' session setup code, as I found
some problems with doing guest under NTLMSSP.
Andrew Bartlett
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
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.
to pstr_sprintf() and fstr_sprintf() to try to standardize.
lots of snprintf() calls were using len-1; some were using
len. At least this helps to be consistent.
Ensure a server can't do a downgrade attack if client signing is mandatory.
Add a lp_server_signing() function and a 'server signing' parameter that
will act as the client one does.
Jeremy
It's so simple now I know how it works - and it has nothing to do with
NTLMSSP (it's just a slightly different use of the old algorithm). :-).
Note: This is actually less secure then the non-NTLMSSP code, as there is
no per-session random data included for NTLM logins. (NTLMv2 is better,
fortunetly).
Andrew Bartlett
the schannel code, but I've included that anyway. :-)
This patch revives the client-side NTLMSSP support for RPC named pipes
in Samba, and cleans up the client and server schannel code. The use of the
new code is enabled by the 'sign', 'seal' and 'schannel' commands in
rpcclient.
The aim was to prove that our separate NTLMSSP client library actually
implements NTLMSSP signing and sealing as per Microsoft's NTLMv1 implementation,
in the hope that knowing this will assist us in correctly implementing
NTLMSSP signing for SMB packets. (Still not yet functional)
This patch replaces the NTLMSSP implementation in rpc_client/cli_pipe.c with
calls to libsmb/ntlmssp.c. In the process, we have gained the ability to
use the more secure NT password, and the ability to sign-only, instead of
having to seal the pipe connection. (Previously we were limited to sealing,
and could only use the LM-password derived key).
Our new client-side NTLMSSP code also needed alteration to cope with our
comparatively simple server-side implementation. A future step is to replace
it with calls to the same NTLMSSP library.
Also included in this patch is the schannel 'sign only' patch I submitted to
the team earlier. While not enabled (and not functional, at this stage) the
work in this patch makes the code paths *much* easier to follow. I have also
included similar hooks in rpccleint to allow the use of schannel on *any* pipe.
rpcclient now defaults to not using schannel (or any other extra per-pipe
authenticiation) for any connection. The 'schannel' command enables schannel
for all pipes until disabled.
This code is also much more secure than the previous code, as changes to our
cli_pipe routines ensure that the authentication footer cannot be removed
by an attacker, and more error states are correctly handled.
(The same needs to be done to our server)
Andrew Bartlett
*) consolidates the dc location routines again (dns
and netbios) get_dc_list() or get_sorted_dc_list()
is the authoritative means of locating DC's again.
(also inludes a flag to get_dc_list() to define
if this should be a DNS only lookup or not)
(however, if you set "name resolve order = hosts wins"
you could still get DNS queries for domain name IFF
ldap_domain2hostlist() fails. The answer? Fix your DNS
setup)
*) enabled DOMAIN<0x1c> lookups to be funneled through
resolve_hosts resulting in a call to ldap_domain2hostlist()
if lp_security() == SEC_ADS
*) enables name cache for winbind ADS backend
*) enable the negative connection cache for winbind
ADS backend
*) removes some old dead code
*) consolidates some duplicate code
*) moves the internal_name_resolve() to use an IP/port pair
to deal with SRV RR dns replies. The namecache code
also supports the IP:port syntax now as well.
*) removes 'ads server' and moves the functionality back
into 'password server' (which can support "hostname:port"
syntax now but works fine with defaults depending on
the value of lp_security())
(this now causes things like the LANMAN protocol and contacting servers with 'encrypt passwords = no' set to fail, if configured)
'client ntlmv2 auth' (a BOOL) forces both plaintext and lanman off, and is the
most secure setting for compatible hosts.
Perhaps we should change this to 'client minimum auth'?
Andrew Bartlett
With big thanks to tpot for the ethereal disector, and for the base code
behind this, we now fully support NTLMv2 as a client.
In particular, we support it with direct domain logons (tested with ntlm_auth
--diagnostics), with 'old style' session setups, and with NTLMSSP.
In fact, for NTLMSSP we recycle one of the parts of the server's reply directly...
(we might need to parse for unicode issues later).
In particular, a Win2k domain controller now supplies us with a session key
for this password, which means that doman joins, and non-spnego SMB signing
are now supported with NTLMv2!
Andrew Bartlett
just the correct error.
This should help us avoid breaking NT4 IPC$ connections, for example.
This has required that we don't overwrite the device type for IPC$ in our
tcon&X code, but only smbwrapper even uses it, and a server that doesn't send
a correct dev type breaks other things pretty badly.
In any case, I'll 'fix' smbwrapper :-).
Andrew Bartlett
A much better SMB signing module, that allows for mulitple signing algorithms
and correctly backs down from signing when the server cannot sign the reply.
This also attempts to enable SMB signing on NTLMSSP connections, but I don't
know what NTLMSSP flags to set yet.
This would allow 'client use signing' to be set by default, for server
compatability. (A seperate option value should be provided for mandetory
signing, which would not back down).
Andrew Bartlett
This patch catches up on the rest of the work - as much string checking
as is possible is done at compile time, and the rest at runtime.
Lots of code converted to pstrcpy() etc, and other code reworked to correctly
call sizeof().
Andrew Bartlett
- new kerberos code, allowing the account to change it's own password
without special SD settings required
- NTLMSSP client code, now seperated from cliconnect.c
- NTLMv2 client code
- SMB signing fixes
Andrew Bartlett
- NTLMSSP over SPENGO (sesssion-setup-and-x) cleanup and code refactor.
- also consequential changes to the NTLMSSP and SPNEGO parsing functions
- and the client code that uses the same functions
- Add ntlm_auth, a NTLMSSP authentication interface for use by applications
like Squid and Apache.
- also consquential changes to use common code for base64 encode/decode.
- Winbind changes to support ntlm_auth (I don't want this program to need
to read smb.conf, instead getting all it's details over the pipe).
- nmbd changes for fstrcat() instead of fstrcpy().
Andrew Bartlett
- change auth_sam to use the initialisation flags to determine if
the password attributes are set
- add const to secrets.c, cliconnect.c
- passdb: fix spelling in pdb_ldap, add group mapping back to smbpasswd
- SAMR: add debugs to show what fails for group enum.
Andrew Bartlett
