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Return "bool" instead of NTSTATUS, use hex_byte() instead of
read_hex_bytes(). And parse directly into a struct GUID instead of the
components. 99 lines less code.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@samba.org>
The correct line should have been
talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 2);
because if the loop does not increment count on exit (it exits via
break), so count is left pointing at the thing that just got put in.
i.e., if there was one item it is at a[0], count is 0, but we also
need the trailing NULL byte at a[1] and the length is 2. Thus + 2, not
+ 1.
This will not affect ordinary (that is, non-malicious) traffic,
because talloc_realloc will not actually realloc unless it is saving a
kilobyte. Since the allocation grows slowly with the exponent ~1.25,
the actual reallocs will start happening at some point between 512 and
1024 items.
In the example we have, there were 666 pointers, and space for 824 was
allocated.
Rather than doing the +2 realloc, it is simpler to leave it off
altogether; in the common case (<512 items) it is a no-op anyway, and
in the best possible case it reduces the temporary array by 20%.
Credit to OSS-Fuzz.
REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24646
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Before, talloc_realloc() was being called n times for an array of
length n. This could be very expensive on long string arrays since it
is reasonable to assume each realloc moves O(n) bytes.
This addresses at least one OSS-Fuzz bug, making a timing out test case
100 times faster. Credit to OSS-Fuzz.
REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19706
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We don't want to leave other parts of the ndr struct hanging off this
string array just because LIBNDR_FLAG_REMAINING is used.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
NBT has a funny thing where it sometimes needs to send a trailing dot as
part of the last component, because the string representation is a user
name. In DNS, "example.com", and "example.com." are the same, both
having three components ("example", "com", ""); in NBT, we want to treat
them differently, with the second form having the three components
("example", "com.", "").
This retains the logic of e6e2ec0001.
Also DNS compression cannot be turned off for NBT.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14378
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
The empty subdomain component is reserved for the root domain, which we
should only (and always) see at the end of the list. That is, we expect
"example.com.", but never "example..com".
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14378
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
This is because ndr_nbt.c does almost exactly the same thing with
almost exactly the same code, and they both do it wrong. Soon they
will both be using the better version that this will become. Though in
this patch we just move the code, not fix it.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14378
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Fix for
*** CID 1457529: Error handling issues (CHECKED_RETURN)
/librpc/ndr/ndr_basic.c: 786 in ndr_push_full_ptr()
...
ID 1457529: Error handling issues (CHECKED_RETURN)
Calling "ndr_token_store" without checking return value (as is done
elsewhere 14 out of 17 times).
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): Gary Lockyer <gary@samba.org>
Autobuild-Date(master): Thu Jan 9 21:49:00 UTC 2020 on sn-devel-184
The new macros allow the same macro convenience for enum functions without
level discriminator.
Guenther
Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This simply matches the behaviour from before e7b1acaddf
when the logic for a trailing . was added. This matches what is added in
the dnsRecord attribute for a name of "." over the dnsserver RPC
management interface and is based on what Windows does for that name
in (eg) an MX record.
No a security bug because we use talloc and so name will be just the
end of the talloc header.
Credit to OSS-Fuzz
Found using the fuzz_ndr_X fuzzer
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Dec 20 11:33:52 UTC 2019 on sn-devel-184
Credit to OSS-Fuzz
Found using the ndr_fuzz_X target.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This breaks the ABI so we merge this into the unreleased libndr-1.0.0.
The advantage of the new functions is there (except for print, which
is unchanged) is an error raised when the token is not found, so
we can be confident in the changes to the token behaviour.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Thu Dec 12 03:56:23 UTC 2019 on sn-devel-184
By removing this we know we do not need to worry about this list
growing without bounds. We merge this into the recently created but
not yet released ABI 1.0.0
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
By removing this we know we do not need to worry about this list
growing without bounds.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Found by Douglas Bagnall using Hongfuzz and the new fuzz_ndr_X
fuzzer.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Found by Douglas Bagnall using Hongfuzz and the new fuzz_ndr_X
fuzzer.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This avoids really long token lists for switch values
that will not be needed past this point.
The function name is changed to clarify what exactly is being
done here, and the old function is removed to ensure it is
not being used anywhere else.
Merge the removal of ndr_print_get_switch_value into
just-tagged librpc/ABI/ndr-1.0.0.sigs as this
has not been put into any release yet.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This will allow generated code to instead push and pop union values onto the
switch_list stack, which is more memory efficient than creating a single large
list to be scannned and eventually discarded.
Merge into unreleased ABI 1.0.0
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This is designed to stop a very large number of tokens from being stored for
arrays of structures containing relative pointers in particular.
This was one part of the minimum patch for CVE-2019-14908 before
being downgraded as not a security-release worthy issue.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This was one part of the minimum patch for CVE-2019-14908 before
being downgraded as not a security-release worthy issue.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This is not a security issue as it only happens when printing the structure
during debugging, not normal production.
Found by Michael Hanselmann using an NDR fuzzer and Hongfuzz.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Without this protection we will spin during decode of a string_array or nstring_array
that is terminated by only a single NUL byte, not two as required by UTF-16.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13874
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
This function is not just unused, it is a problem because there is no
enforced connection between r->ab.length and r->cbData.
The last caller was removed in the previous commit.
Found by Douglas Bagnall using Hongfuzz and the new fuzz_ndr_X
fuzzer.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
When there is no data we still need to allocate for the terminating NULL.
Found by Michael Hanselmann using Honggfuzz and an fuzzer for Samba's
NDR layer.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13875
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This should aid in debugging NDR parse failures.
Use the ABI bump to again exclude ndr_table_misc incorrectly
added in ABI 0.2.1.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Nov 19 14:47:46 UTC 2019 on sn-devel-184
