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We need to be able to give sensible error messages when a kerberos
calls fails. This propogates the kerberos error up the stack to the
caller.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
After looking at the s4 side of the (s)channel :) I found out that it makes
more sense to simply make it use the tdb based code than redo the same changes
done to s3 to simplify the interface.
Ldb is slow, to the point it needs haks to pre-open the db to speed it up, yet
that does not solve the lookup speed, with ldb it is always going to be slower.
Looking through the history it is evident that the schannel database doesn't
really need greate expanadability. And lookups are always done with a single
Key. This seem a perfet fit for tdb while ldb looks unnecessarily complicated.
The schannel database is not really a persistent one. It can be discared during
an upgrade without causing any real issue. all it contains is temproary session
data.
The comment for USER_INFO_INTERACTIVE_LOGON looks like a cut-n-paste from the line above.
Signed-off-by: Matthias Dieter Wallnöfer <mwallnoefer@yahoo.de>
This allows the integration of external tools that can't be linked
into C or python, but need to authenticate as the local machine
account.
The machineaccountccache script demonstrates this, and debugging has
been improved in cli_credentials_set_secrets() by passing back and
error string.
Andrew Bartlett
dsdb_find_dn_by_guid() now takes a struct GUID instead of a
guid_string. All the callers in fact wanted a struct GUID, so we now
avoid the extra conversion.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
In some cases those structures are not initialised and the whole authentication
system crashes with a SIGSEGV. Bug discovered by Matthieu Patou in bug #6755.
This allows us to reuse a ldb context if it is open twice, instead
of going through the expensive process of a full ldb open. We can
reuse it if all of the parameters are the same.
The change relies on callers using talloc_unlink() or free of a parent
to close a ldb context.
This patch adds a system_session cache, preventing us from having to
recreate it on every ldb open, and allowing us to detect when the same
session is being used in ldb_wrap
For KERBEROS applications the realm should be upcase (function "lp_realm") but
for DNS ones it should be used lowcase (function "lp_dnsdomain"). This patch
implements the use of both in the right way.
The purpose of admin_session is to be able to execute parts of provisioning
as the user Administrator in order to have the correct group and owner in the
security descriptors. To be used for provisioning and tests only.
We have not only to expand the additional groups but *also* the primary group to
gain all rights of a user account.
Also, remove an unneeded context (tmp_ctx) and "talloc_steal".
This library intercepts seteuid and related calls, and simulates them
in a manner similar to the nss_wrapper and socket_wrapper
libraries. This allows us to enable the vfs_unixuid NTVFS module in
the build farm, which means we are more likely to catch errors in the
token manipulation.
The simulation is not complete, but it is enough for Samba4 for
now. The major areas of incompleteness are:
- no emulation of setreuid, setresuid or saved uids. These would be
needed for use in Samba3
- no emulation of ruid changing. That would also be needed for Samba3
- no attempt to emulate file ownership changing, so code that (for
example) tests whether st.st_uid matches geteuid() needs special
handling
This patch adds a function "authsam_expand_nested_groups" (calculation of rights
through expanding groups of a certain SID) which basically collects all
memberships through "memberOf" attributes. It works with either user or group SIDs.
For avoiding loops it tests on each call if the SID hasn't been added yet (through
the helper function "sids_contains_sid").
The function itself is called by "authsam_make_server_info".
This extends the PKINIT code in Heimdal to ask the HDB layer if the
User Principal Name name in the certificate is an alias (perhaps just
by case change) of the name given in the AS-REQ. (This was a TODO in
the Heimdal KDC)
The testsuite is extended to test this behaviour, and the other PKINIT
certficate (using the standard method to specify a principal name in a
certificate) is updated to use a Administrator (not administrator).
(This fixes the kinit test).
Andrew Bartlett
It is much easier to do decryption with wireshark when the keytab is
available for every host in the domain. Running 'net export keytab
<keytab name>' will export the current (as pointed to by the supplied
smb.conf) local Samba4 doamin.
(This uses Heimdal's 'hdb' keytab and then the existing hdb-samba4,
and so has a good chance of keeping working in the long term).
Andrew Bartlett
It is much easier to do decryption with wireshark when the keytab is
available for every host in the domain. Running 'net export keytab
<keytab name>' will export the current (as pointed to by the supplied
smb.conf) local Samba4 doamin.
(This uses Heimdal's 'hdb' keytab and then the existing hdb-samba4,
and so has a good chance of keeping working in the long term).
Andrew Bartlett
Each attribute we request from LDB comes with a small cost, so don't
lookup any more than we must for the (very) frequent krbtgt lookup
case. Similarly, we don't need to build a PAC for a server (as a
target), so don't ask for the PAC attributes here either.
Andrew Bartlett
When emulating Samba3 (which we do to ensure we don't break
compatability), don't do mutual authentication by default, as it
breaks the session key with AES and isn't what Samba3 does anyway.
Andrew Bartlett
This allows the older 'like Samba3' GENSEC krb5 implementation to work
against Windows 2008. I'm using this to track down interop issues in
this area.
Andrew Bartlett
s4:auth/ntlmssp: let _unwrap fallback to seal if sign only doesn't work
Windows always uses SEAL with NTLMSSP on LDAP connection even if not negotiated.
metze
The session keys as supplied already have a reference on them, so
stealing them creates challenges. For 16 bytes, it is just easier to
be consistant and copy them.
Andrew Bartlett
This reworks the notes file to be less stream-of-consciousness and more
task for porting, with a very particular focus on a potential port of
Samba4 to use MIT Kerberos.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
This requires a rework on Heimdal's windc plugin layer, as we want
full control over what tickets Heimdal will issue. (In particular, in
case our requirements become more complex in future).
The original problem was that Heimdal's check would permit the ticket,
but Samba would then deny it, not knowing it was for kadmin/changepw
Also (in hdb-samba4) be a bit more careful on what entries we will
make the 'change_pw' service mark that this depends on.
Andrew Bartlett
Also including the supporting changes required to pass make test
A number of heimdal functions and constants have changed since we last
imported a tree (for the better, but inconvenient for us).
Andrew Bartlett
Compiled with Andrew over a series of phone calls and gobby sessions,
with the aim of documenting Kerberos requirements for Samba to us an
alternate (ie, MIT) Kerberos library.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Compiled with Andrew over a series of phone calls and gobby sessions
with Andrew, with the aim of documenting Kerberos requirements for
Samba to us an alternate (ie, MIT) Kerberos library.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Logs showed that every SAM authentication was causing a non-indexed
ldb search for member=XXX. This was previously indexed in Samba4, but
since we switched to using the indexes from the full AD schema it now
isn't.
The fix is to use the extended DN operations to allow us to ask the
server for the memberOf attribute instead, with with the SIDs attached
to the result. This also means one less search on every
authentication.
The patch is made more complex by the fact that some common routines
use the result of these user searches, so we had to update all
searches that uses user_attrs and those common routines to make sure
they all returned a ldb_message with a memberOf filled in and the SIDs
attached.
A single AD server can only host a single domain, so don't stuff about
with looking up our crossRef record in the cn=Partitions container.
We instead trust that lp_realm() and lp_workgroup() works correctly.
Andrew Bartlett
This bit actually means that we should ignore the minimum password
length field for this user. It doesn't mean that the password should
be seen as empty
This means it must be accessed via the supplied auth_context in the
GENSEC server, and should remove the hard depenceny of GENSEC on the
auth subsystem and ldb (allowing LDB not to rely on LDB is considered
a good thing, apparently)
Andrew Bartlett
When starting GENSEC on the server, the auth subsystem context must be
passed in, which now includes function pointers to the key elements.
This should (when the other dependencies are fixed up) allow GENSEC to
exist as a client or server library without bundling in too much of
our server code.
Andrew Bartlett
Eventually, we should move some of these parameters into a separate
struct (perhaps into smb_transport_options?), to avoid the long lists of
parameters.
This uses a virtual attribute 'clearTextPassword' (name chosen to
match references in MS-SAMR) that contains the length-limited blob
containing an allegidly UTF16 password. This ensures we do no
validation or filtering of the password before we get a chance to MD4
it. We can then do the required munging into UTF8, and in future
implement the rules Microsoft has provided us with for invalid inputs.
All layers in the process now deal with the strings as length-limited
inputs, incluing the krb5 string2key calls.
This commit also includes a small change to samdb_result_passwords()
to ensure that LM passwords are not returned to the application logic
if LM authentication is disabled.
The objectClass module has been modified to allow the
clearTextPassword attribute to pass down the stack.
Andrew Bartlett
4, even though the macros are still different.
This makes it possible to use object code compiled with one DEBUG()
macro from the other sourceX directory.
