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Commit Graph

5 Commits

Author SHA1 Message Date
Douglas Bagnall
cc3a67760c CVE-2020-10745: ndr/dns-utils: prepare for NBT compatibility
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>
2020-07-02 09:01:41 +00:00
Douglas Bagnall
c3fa8ada43 CVE-2020-10745: dns_util/push: forbid names longer than 255 bytes
As per RFC 1035.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14378

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2020-07-02 09:01:41 +00:00
Douglas Bagnall
51a4571849 CVE-2020-10745: ndr_dns: do not allow consecutive dots
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>
2020-07-02 09:01:41 +00:00
Douglas Bagnall
bb63737905 CVE-2020-10745: ndr/dns_utils: correct a comment
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14378

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2020-07-02 09:01:41 +00:00
Douglas Bagnall
601e8a3f69 CVE-2020-10745: ndr_dns: move ndr_push_dns_string core into sharable function
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>
2020-07-02 09:01:41 +00:00