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mirror of https://github.com/samba-team/samba.git synced 2025-02-01 05:47:28 +03:00

37686 Commits

Author SHA1 Message Date
Joseph Sutton
63020bf13c CVE-2021-20251 tests/krb5: Add tests for password lockout race
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>
(cherry picked from commit 91e2e5616ccd507fcaf097533c5fc25974119c1e)

[jsutton@samba.org Fixed conflicts in usage.py, knownfails, and tests.py
 due to not having claims tests]

[jsutton@samba.org Removed tests for unsupported SAMR AES password
 change, removed related GNUTLS_PBKDF2_SUPPORT environment variable, and
 fixed knownfail conflicts; marked all password lockout tests as
 flapping due to sporadic failures seen with Fedora 35]
2022-09-18 16:46:09 +00:00
Ralph Boehme
b807f3624d smbtorture: add a test trying to create a stream on share without streams support
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15126
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15161

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
(backported from commit 3dcdab86f13fabb7a8c6ce71c59a565287d11244)
[slow@samba.org: context changes from different tests]
2022-09-06 07:54:14 +00:00
Ralph Boehme
6e091cc59a smbtorture: check required access for SMB2-GETINFO
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15153

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 9b2d28157107602fcbe659664cf9ca25f08bb30b)
2022-09-06 07:54:13 +00:00
Ralph Boehme
d89294ecfc s4/libcli/smb2: avoid using smb2_composite_setpathinfo() in smb2_util_setatr()
smb2_composite_setpathinfo() uses SEC_FLAG_MAXIMUM_ALLOWED which can
have unwanted side effects like breaking oplocks if the effective access
includes [READ|WRITE]_DATA.

For changing the DOS attributes we only need SEC_FILE_WRITE_ATTRIBUTE. With this
change test_smb2_oplock_batch25() doesn't trigger an oplock break anymore.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15153

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 66e40690bdd41800a01333ce4243bd62ee2b1894)
2022-09-06 07:54:13 +00:00
Ralph Boehme
3d54c1b6eb smbtorture: add test smb2.stream.attributes2
Specifically torture the creation date is the same for the file and its streams.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15126
MR: https://gitlab.com/samba-team/samba/-/merge_requests/2643

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit e74b10e17ee5df0f77ac5349242841be8d71c4e8)
2022-09-06 07:54:13 +00:00
Ralph Boehme
6ee18ad9ea smbtorture: rename smb2.streams.attributes to smb2.streams.attributes1
A subsequent commit adds another streams test named "attributes2", this change
avoids matching the new testname with the existing knownfail entries.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15126
MR: https://gitlab.com/samba-team/samba/-/merge_requests/2643

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit b5848d391be4f7633745d9c36e432ac8b1c9dba2)
2022-09-06 07:54:13 +00:00
Stefan Metzmacher
b910d9f6e0 s4:torture/smb2: add smb2.lease.v[1,2]_bug_15148
This demonstrates the bug that happens with a
write to a file handle holding an R lease,
while there are other openers without any lease.

When one of the other openers writes to the file,
the R lease of the only lease holder isn't broken to NONE.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15148

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
(cherry picked from commit 9e5ff607eb1b9c45c8836d3cff9d51b418740b87)
2022-08-23 07:45:16 +00:00
Ralph Boehme
5598ddaaf4 CI: fix check for correct mdsvc resonse when connecting to a share with Spotlight disabled
A Mac SMB server returns an all zero handle and an empty path if Spotlight is
disabled on a share. We must return the exact same error return in order to
trigger client-side searching.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=15086
pcap: https://www.samba.org/~slow/pcaps/mac-bigsur-smbserver-spotlight-disabled.pcapng.gz

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Noel Power <npower@samba.org>
(backported from commit 8e997bd6e9250499fd8e569d708edc29e304a0e8)
[slow@samba.org: conflicts in tests.py caused by unrelated tests]
2022-07-31 18:09:11 +00:00
Jeremy Allison
ed3f82f4d7 CVE-2022-32742: s4: torture: Add raw.write.bad-write test.
Reproduces the test code in:

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15085

Add knownfail.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
2022-07-24 09:29:26 +02:00
Joseph Sutton
a46dd2846f CVE-2022-2031 s4:kpasswd: Do not accept TGTs as kpasswd tickets
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>

[jsutton@samba.org Fixed knownfail conflicts]
2022-07-24 09:23:56 +02:00
Joseph Sutton
8c0f421852 CVE-2022-2031 s4:auth: Use PAC to determine whether ticket is a TGT
We use the presence or absence of a REQUESTER_SID PAC buffer to
determine whether the ticket is a TGT. We will later use this to reject
TGTs where a service ticket is expected.

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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
9895018b64 CVE-2022-2031 auth: Add ticket type field to auth_user_info_dc and auth_session_info
This field may be used to convey whether we were provided with a TGT or
a non-TGT. We ensure both structures are zeroed out to avoid incorrect
results being produced by an uninitialised field.

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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
7ee246ef9c CVE-2022-32744 s4:kpasswd: Ensure we pass the kpasswd server principal into krb5_rd_req_ctx()
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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
c9e1949fa8 CVE-2022-32744 s4:kdc: Modify HDB plugin to only look up kpasswd principal
This plugin is now only used by the kpasswd service. Thus, ensuring we
only look up the kadmin/changepw principal means we can't be fooled into
accepting tickets for other service principals. We make sure not to
specify a specific kvno, to ensure that we do not accept RODC-issued
tickets.

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>

[jsutton@samba.org Fixed knownfail conflicts]
2022-07-24 09:23:56 +02:00
Joseph Sutton
fa198ce28f s4:kdc: Remove kadmin mode from HDB plugin
It appears we no longer require it.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
2022-07-24 09:23:56 +02:00
Joseph Sutton
d03021791b CVE-2022-32744 s4:kdc: Rename keytab_name -> kpasswd_keytab_name
This makes explicitly clear the purpose of this keytab.

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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
0cb4100d16 CVE-2022-2031 s4:kdc: Don't use strncmp to compare principal components
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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
8d8ffbfc7b CVE-2022-32744 s4:kdc: Don't allow HDB keytab iteration
A fallback in krb5_rd_req_ctx() means that Samba's kpasswd service will
try many inappropriate keys to decrypt the ticket supplied to it. For
example, it will accept a ticket encrypted with the Administrator's key,
when it should rather accept only tickets encrypted with the krbtgt's
key (and not an RODC krbtgt). To fix this, declare the HDB keytab using
the HDBGET ops, which do not support iteration.

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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
90e53b8eae CVE-2022-2031 s4:kdc: Reject tickets during the last two minutes of their life
For Heimdal, this now matches the behaviour of Windows. The object of
this requirement is to ensure we don't allow kpasswd tickets, not having
a lifetime of more than two minutes, to be passed off as TGTs.

An existing requirement for TGTs to contain a REQUESTER_SID PAC buffer
suffices to prevent kpasswd ticket misuse, so this is just an additional
precaution on top.

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>
2022-07-24 09:23:56 +02:00
Joseph Sutton
f70ada5eb4 CVE-2022-2031 s4:kdc: Limit kpasswd ticket lifetime to two minutes or less
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>

[jsutton@samba.org Adapted entry to entry_ex->entry; included
 samba_kdc.h header file]
2022-07-24 09:23:56 +02:00
Joseph Sutton
fb7391ca60 CVE-2022-2031 s4:kdc: Fix canonicalisation of kadmin/changepw principal
Since this principal goes through the samba_kdc_fetch_server() path,
setting the canonicalisation flag would cause the principal to be
replaced with the sAMAccountName; this meant requests to
kadmin/changepw@REALM would result in a ticket to krbtgt@REALM. Now we
properly handle canonicalisation for the kadmin/changepw principal.

View with 'git show -b'.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047

Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>

[jsutton@samba.org Adapted entry to entry_ex->entry; removed MIT KDC
 1.20-specific knownfails]
2022-07-24 09:23:56 +02:00
Joseph Sutton
2b63f021e5 CVE-2022-2031 s4:kdc: Refactor samba_kdc_get_entry_principal()
This eliminates some duplicate branches.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
2022-07-24 09:23:56 +02:00
Joseph Sutton
9022a69aeb CVE-2022-2031 s4:kdc: Split out a samba_kdc_get_entry_principal() function
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>

[jsutton@samba.org Adapted entry to entry_ex->entry]
2022-07-24 09:23:56 +02:00
Andreas Schneider
ada799129e CVE-2022-2031 s4:kdc: Implement is_kadmin_changepw() helper function
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>

[jsutton@samba.org Adapted entry to entry_ex->entry]
2022-07-24 09:23:56 +02:00
Joseph Sutton
59d656406f s4:kpasswd: Restructure code for clarity
View with 'git show -b'.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
2022-07-24 09:23:55 +02:00
Joseph Sutton
b8d97f5bd5 CVE-2022-2031 s4:kpasswd: Require an initial ticket
Ensure that for password changes the client uses an AS-REQ to get the
ticket to kpasswd, and not a TGS-REQ.

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>

[jsutton@samba.org Removed MIT KDC 1.20-specific knownfails]
2022-07-24 09:23:55 +02:00
Joseph Sutton
eade23880e CVE-2022-2031 gensec_krb5: Add helper function to check if client sent an initial ticket
This will be used in the kpasswd service to ensure that the client has
an initial ticket to kadmin/changepw, and not a service ticket.

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>
2022-07-24 09:23:55 +02:00
Joseph Sutton
393c18b53e CVE-2022-2031 s4:kpasswd: Return a kpasswd error code in KRB-ERROR
If we attempt to return an error code outside of Heimdal's allowed range
[KRB5KDC_ERR_NONE, KRB5_ERR_RCSID), it will be replaced with a GENERIC
error, and the error text will be set to the meaningless result of
krb5_get_error_message(). Avoid this by ensuring the error code is in
the correct range.

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>
2022-07-24 09:23:55 +02:00
Joseph Sutton
63d6af6ed7 CVE-2022-2031 s4:kpasswd: Don't return AP-REP on failure
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>

[jsutton@samba.org Removed MIT KDC 1.20-specific knownfails]
2022-07-24 09:23:55 +02:00
Joseph Sutton
705e7ff46d CVE-2022-2031 s4:kpasswd: Correctly generate error strings
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>

[jsutton@samba.org Removed MIT KDC 1.20-specific knownfails]
2022-07-24 09:23:55 +02:00
Joseph Sutton
8a4f07c2ca CVE-2022-2031 tests/krb5: Add tests for kpasswd service
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>

[jsutton@samba.org Fixed conflicts in usage.py and knownfails; removed
 MIT KDC 1.20-specific knownfails as it's not supported]
2022-07-24 09:23:55 +02:00
Joseph Sutton
4af9286727 CVE-2022-32744 selftest: Specify Administrator kvno for Python krb5 tests
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>
2022-07-24 09:23:55 +02:00
Joseph Sutton
3bd5df466c CVE-2022-2031 s4:kpasswd: Add MIT fallback for decoding setpw structure
The target principal and realm fields of the setpw structure are
supposed to be optional, but in MIT Kerberos they are mandatory. For
better compatibility and ease of testing, fall back to parsing the
simpler (containing only the new password) structure if the MIT function
fails to decode it.

Although the target principal and realm fields should be optional, one
is not supposed to specified without the other, so we don't have to deal
with the case where only one is specified.

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>
2022-07-24 09:23:55 +02:00
Joseph Sutton
f706dcd5dd CVE-2022-2031 s4:kpasswd: Account for missing target principal
This field is supposed to be optional.

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>
2022-07-24 09:23:55 +02:00
Joseph Sutton
628534b4dc CVE-2022-2031 s4:kdc: Add MIT support for ATTRIBUTES_INFO and REQUESTER_SID PAC buffers
So that we do not confuse TGTs and kpasswd tickets, it is critical to
check that the REQUESTER_SID buffer exists in TGTs, and to ensure that
it is not propagated to service tickets.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:23:55 +02:00
Joseph Sutton
06444c0d4e selftest: Simplify krb5 test environments
It's not necessary to repeat the required environment variables for
every test.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit e729606631b5bfaf7c4ad8c1e70697adf8274777)
2022-07-24 09:23:55 +02:00
Andreas Schneider
23f770ed91 s4:kdc: Also cannoicalize krbtgt principals when enforcing canonicalization
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit f1ec950aeb47283a504018bafa21f54c3282e70c)
2022-07-24 09:23:55 +02:00
Joseph Sutton
e0d25e172c CVE-2022-32745 s4/dsdb/util: Correctly copy values into message element
To use memcpy(), we need to specify the number of bytes to copy, rather
than the number of ldb_val structures.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15008

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:22 +02:00
Joseph Sutton
701aef133f CVE-2022-32745 s4/dsdb/util: Don't call memcpy() with a NULL pointer
Doing so is undefined behaviour.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15008

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:22 +02:00
Joseph Sutton
f2ded77168 CVE-2022-32745 s4/dsdb/util: Use correct value for loop count limit
Currently, we can crash the server by sending a large number of values
of a specific attribute (such as sAMAccountName) spread across a few
message elements. If val_count is larger than the total number of
elements, we get an access beyond the elements array.

Similarly, we can include unrelated message elements prior to the
message elements of the attribute in question, so that not all of the
attribute's values are copied into the returned elements values array.
This can cause the server to access uninitialised data, likely resulting
in a crash or unexpected behaviour.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15008

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:22 +02:00
Joseph Sutton
1d7690b000 CVE-2022-32745 s4/dsdb/samldb: Check for empty values array
This avoids potentially trying to access the first element of an empty
array.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15008

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:22 +02:00
Joseph Sutton
18b73e01ca CVE-2022-32746 ldb: Make use of functions for appending to an ldb_message
This aims to minimise usage of the error-prone pattern of searching for
a just-added message element in order to make modifications to it (and
potentially finding the wrong element).

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
a7a59c540b CVE-2022-32746 ldb: Ensure shallow copy modifications do not affect original message
Using the newly added ldb flag, we can now detect when a message has
been shallow-copied so that its elements share their values with the
original message elements. Then when adding values to the copied
message, we now make a copy of the shared values array first.

This should prevent a use-after-free that occurred in LDB modules when
new values were added to a shallow copy of a message by calling
talloc_realloc() on the original values array, invalidating the 'values'
pointer in the original message element. The original values pointer can
later be used in the database audit logging module which logs database
requests, and potentially cause a crash.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
77d8711774 CVE-2022-32746 s4/registry: Use LDB_FLAG_MOD_TYPE() for flags equality check
Now unrelated flags will no longer affect the result.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
738955d0e1 CVE-2022-32746 s4/dsdb/tombstone_reanimate: Use LDB_FLAG_MOD_TYPE() for flags equality check
Now unrelated flags will no longer affect the result.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
f2ee4c78d9 CVE-2022-32746 s4/dsdb/repl_meta_data: Use LDB_FLAG_MOD_TYPE() for flags equality check
Now unrelated flags will no longer affect the result.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
b436fa43f2 CVE-2022-32746 s4/dsdb/acl: Fix LDB flags comparison
LDB_FLAG_MOD_* values are not actually flags, and the previous
comparison was equivalent to

(el->flags & LDB_FLAG_MOD_MASK) == 0

which is only true if none of the LDB_FLAG_MOD_* values are set, so we
would not successfully return if the element was a DELETE. Correct the
expression to what it was intended to be.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
e46e43f76e CVE-2022-32746 s4:torture: Fix LDB flags comparison
LDB_FLAG_MOD_* values are not actually flags, and the previous
comparison was equivalent to

(el->flags & LDB_FLAG_MOD_MASK) == 0

which is only true if none of the LDB_FLAG_MOD_* values are set. Correct
the expression to what it was probably intended to be.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
59cd645b39 CVE-2022-32746 s4/dsdb/partition: Fix LDB flags comparison
LDB_FLAG_MOD_* values are not actually flags, and the previous
comparison was equivalent to

(req_msg->elements[el_idx].flags & LDB_FLAG_MOD_MASK) != 0

which is true whenever any of the LDB_FLAG_MOD_* values are set. Correct
the expression to what it was probably intended to be.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00
Joseph Sutton
c83967ad71 CVE-2022-32746 s4:dsdb:tests: Add test for deleting a disallowed SPN
If an account has an SPN that requires Write Property to set, we should
still be able to delete it with just Validated Write.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15009

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-07-24 09:20:21 +02:00