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BUG: https://bugzilla.samba.org/show_bug.cgi?id=14611
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Based on tests originally written by Stefan Metzmacher <metze@samba.org>
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri Sep 9 01:11:05 UTC 2022 on sn-devel-184
If TGTs can be used as kpasswd tickets, the two-minute lifetime of a
authentic kpasswd ticket may be bypassed. Furthermore, kpasswd tickets
are not supposed to be cached, but using this flaw, a stolen credentials
cache containing a TGT may be used to change that account's password,
and thus is made more valuable to an attacker.
Since all TGTs should be issued with a REQUESTER_SID PAC buffer, and
service tickets without it, we assert the absence of this buffer to
ensure we're not accepting a TGT.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15049
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
To ensure that, when decrypting the kpasswd ticket, we look up the
correct principal and don't trust the sname from the ticket, we should
pass the principal name of the kpasswd service into krb5_rd_req_ctx().
However, gensec_krb5_update_internal() will pass in NULL unless the
principal in our credentials is CRED_SPECIFIED.
At present, our principal will be considered obtained as CRED_SMB_CONF
(from the cli_credentials_set_conf() a few lines up), so we explicitly
set the realm again, but this time as CRED_SPECIFIED. Now the value of
server_in_keytab that we provide to smb_krb5_rd_req_decoded() will not
be NULL.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15074
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
We would only compare the first 'n' characters, where 'n' is the length
of the principal component string, so 'k@REALM' would erroneously be
considered equal to 'krbtgt@REALM'.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
We should not be able to use krb@REALM instead of krbtgt@REALM.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
This matches the behaviour of Windows.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
The error_data we create already has an explicit length, and should not
be zero-terminated, so we omit the trailing null byte. Previously,
Heimdal builds would leave a superfluous trailing null byte on error
strings, while MIT builds would omit the final character.
The two bytes added to the string's length are for the prepended error
code.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15049
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15074
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
There is no need to specify the enctype and it isn't supported by MIT Kerberos
anyway.
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Fri Mar 25 21:54:11 UTC 2022 on sn-devel-184
We also move the authentication to after checking whether the user is
protected, so that if a user in the Protected Users group tries to
authenticate with a wrong password, the bag password count is not
incremented and the account is not locked out. This does not match
MS-APDS, but matches the behaviour of Windows.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Accounts in the Protected Users group acting as clients lack support for
the RC4 encryption type. TGTs issued to such accounts have a lifetime
restricted to four hours, and are unable to be proxied or forwarded.
To determine at lookup time whether a client account is a member of
Protected Users, we now also create an auth_user_info_dc structure when
creating the database entry for an AS-REQ, rather than only when
creating a PAC for a TGT, or when recreating the PAC from an RODC-issued
TGT.
This means that the user's groups are now expanded even for AS-REQs that
result in an error (such as a PREAUTH_REQUIRED error), but this is
required to be able to correctly determine the account's available
encryption types, which are needed soon after fetching the user account.
Currently, the TGT lifetime may exceed four hours (for Heimdal
specifically). This may happen if PKINIT is used, and either the
pkinit_max_life_from_cert_extension option is TRUE and
pkinit_max_life_bound is greater than four hours, or
pkinit_max_life_from_cert is greater than four hours.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Allow delegation to any target if we have delegations set up, but the target is
not specified.
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Pair-Programmed-With: Alexander Bokovoy <ab@samba.org>
Signed-off-by: Alexander Bokovoy <ab@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This also addresses CVE-2020-17049.
MIT Kerberos 1.20 is in pre-release state at the time writing this commit. It
will be released in autumn 2022. We need to support MIT Kerberos 1.19 till
enough distributions have been released with MIT Kerberos 1.20.
Pair-Programmed-With: Robbie Harwood <rharwood@redhat.com>
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
The Heimdal upgrade brings the new feature of FAST, allowing more tests to pass.
However it causes a regression in FL2003 for the returned salt format in
the AS-REP, but FL 2003 has not been the default since Samba 4.2 as AES
keys are much stronger and should be preferred.
NOTE: THIS COMMIT WON'T COMPILE/WORK ON ITS OWN!
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Padding this buffer to a multiple of 8 bytes allows the PAC buffer
padding to match Windows.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This flag should be ignored and the FAST armor key used instead.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Dec 7 04:54:35 UTC 2021 on sn-devel-184
Using a SPN should only be permitted if it is also a UPN, and is not an
enterprise principal.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We set EXPECT_EXTRA_PAC_BUFFERS to 0 for the moment. This signifies that
these checks are currently not enforced, which avoids a lot of test
failures.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
See also
ac8865a221
Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Signed-off-by: Isaac Boukris <iboukris@gmail.com>
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Mon Nov 29 09:32:26 UTC 2021 on sn-devel-184
Tests against Windows 2019 show that UF_NO_AUTH_DATA_REQUIRED
applies to services only, not to clients.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14871
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14642
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Sun Oct 17 23:40:33 UTC 2021 on sn-devel-184
Note: the test 'test_fast_tgs_inner_no_sname' crashes the MIT KDC.
This is fixed in MIT Krb5 commit d775c95af7606a51bf79547a94fa52ddd1cb7f49
and was given CVE-2021-37750
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14770
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
A test in a TestCase class should not return a value, the
test is determined by the assertions raised.
Other changes will shortly cause kdc_exchange_dict[preauth_etype_info2]
to not always be filled, so we need to remove this
rudundent code.
This also fixes a *lot* of tests against the MIT KDC
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14770
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Note: Without the previous patch, 'test_fast_tgs_outer_no_sname' would
crash the Heimdal KDC.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14770
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
Without this additional 'self.strict_checking' check, the tests in the
following patches do not get far enough to trigger a crash with the MIT
KDC.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
Without this additional 'self.strict_checking' check, the tests in the
following patches do not get far enough to trigger a crash with the MIT
KDC, instead failing when obtaining a TGT for the user or machine.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14770
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
This avoid shipping untested code and aligns with the version
used in GitLab CI for all the MIT builds.
The "bronze bit" (CVE-2020-17049) security fixes will need
a new MIT KDB version in any case, this prepares the ground
by removing the older version support.
(knownfail_mit_kdc updates taken from a patch by
Andreas Schneider <asn@samba.org> that did this optionally)
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Example command:
SERVER=addc STRICT_CHECKING=0 SMB_CONF_PATH=/dev/null \
KRB5_CONFIG=krb5.conf DOMAIN=ADDOMAIN REALM=ADDOM.SAMBA.EXAMPLE.COM \
ADMIN_USERNAME=Administrator ADMIN_PASSWORD=locDCpass1 \
PYTHONPATH=bin/python python/samba/tests/krb5/fast_tests.py
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Wed Aug 18 23:20:14 UTC 2021 on sn-devel-184
This enables us to more easily switch to a different algorithm to find
the strongest key in _kdc_find_etype().
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
The credentials for the client and krbtgt accounts are now fetched
automatically rather than using environment variables, and the client
account is now automatically created.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
There are a lot of things we should improve in our KDC
in order to work like a Windows KDC.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Tests of [MS-KILE]: Kerberos Protocol Extensions
section 3.3.5.6.1 Client Principal Lookup
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Isaac Boukris <iboukris@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon Apr 12 00:38:26 UTC 2021 on sn-devel-184
Add tests that set the server name to the client name for the machine
account in the kerberos AS_REQ. This replicates the TEST_AS_REQ_SELF
test phase in source4/torture/krb5/kdc-canon-heimdal.c.
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon Nov 30 05:21:42 UTC 2020 on sn-devel-184
This is documented in MS-KILE.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Autobuild-User(master): Gary Lockyer <gary@samba.org>
Autobuild-Date(master): Wed Nov 11 02:38:46 UTC 2020 on sn-devel-184
This test passed against Samba but failed against Windows when
an enterprise principal (user@domain.com@REALM) was encoded as
NT_PRINCIPAL.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Add new python test to document the differences between the MIT and
Heimdal Kerberos implementations.
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Add python canonicalization tests, loosely based on the code in
source4/torture/krb5/kdc-canon-heimdal.c. The long term goal is to move
the integration level tests out of kdc-canon-heimdal, leaving it as a
heimdal library unit test.
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Add a MIT kerberos specific known fail, will be needed by subsequent
commits.
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
