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This final patch enables sending TSIG error records by adding
DNS_RCODE_NOTAUTH to the set of error conditions that are allowed to
trigger sending a full generated response.
See RFC 2845 "4.5.1. KEY check and error handling" and "4.5.3. MAC check
and error handling".
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Call dns_verify_tsig() after updating state.flags and assign and use
out_packet for dns_verify_tsig().
We will need the updated flags when sending TSIG error responses when
TSIG request MAC verification fails and dns_verify_tsig() uses the
passed in packet as response, so we have to make sure we copy in_packet
to out_packet before calling out and pass out_packet.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
See RFC 2845 "4.3. TSIG on TSIG Error returns".
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
According to RFC 2845 "4.5.3. MAC check and error handling" we must
return NOTAUTH and DNS_RCODE_BADSIG when MAC verification fails.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
We need the TKEY name when adding TSIG records to error responses.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Split out function that does the MAC computation from the TSIG record
creating function. This will later simplify the code when creating error
responsed to TSIG requests with bad MACs where we have to add the TSIG
record with an empty MAC.
No functional behaviour change besides hard coding "gss-tsig" algorithm
name: later when sending a TSIG error response for a TKEY request with a
bad keyname, we won't have a tkey to fetch the algorithm name from.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
According to RFC 2845 "4.2 TSIG on Answers", when the request is signed,
the request MAC must be included in the response MAC calculation.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Cf RFC2845, 3.4.2. "TSIG Variables", the request id (original_id) is not
used in the MAC calculation. This also explains the mysterious 2 bytes
padding.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
This allows a secondary DNS forwarder for a trivial failover. Requests
which fail/timeout at the primary DNS forwarder will be restarted
entirely with the next forwarder in the list.
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
All subsystems that include pytalloc.h need to link against
pytalloc-util.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11789
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Garming Sam <garming@samba.org>
Autobuild-Date(master): Tue Mar 15 07:08:16 CET 2016 on sn-devel-144
From RFC 1035:
3.3.14. TXT RDATA format
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ TXT-DATA /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
where:
TXT-DATA One or more <character-string>s.
TXT RRs are used to hold descriptive text. The semantics of the text
depends on the domain where it is found.
Each record contains an array of strings instead of just one string.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11128
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11686
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This is necessary because it has public headers.
Signed-off-by: Jelmer Vernooij <jelmer@jelmer.uk>
Reviewed-By: Andrew Bartlett <abartlet@samba.org>
Reviewed-By: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date(master): Wed Jan 13 07:47:04 CET 2016 on sn-devel-144
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Kai Blin <kai@samba.org>
Autobuild-User(master): Kai Blin <kai@samba.org>
Autobuild-Date(master): Tue Dec 15 17:50:32 CET 2015 on sn-devel-104
By making sure that the answers are always allocated, we don't have
to pass an explicit mem_ctx anymore
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Kai Blin <kai@samba.org>
This puts the talloc_realloc into add_response_rr instead of before
create_response_rr. It is a bit less efficient, but as we do not expect
hundreds of answers, I think this code is a bit easier to understand.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Kai Blin <kai@samba.org>
clang complains that '\0' is converted to a NULL pointer. This seems
to work fine, so make this pointer explicitly NULL. If instead we
need a "" here, we could of course do that too.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Nov 10 10:13:18 CET 2015 on sn-devel-104
This allows us to find a DNS record by searching LDB and unpacking the dnsRecord
but replace the record using the common code that will create a tombstone
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
When not looking for tombstones, a record without a dnsRecord value may as
well not be present, so just return WERR_DNS_ERROR_NAME_DOES_NOT_EXIST
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
This will allow a python module to be written to modify DNS entries in sam.ldb directly
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Aug 7 12:57:02 CEST 2015 on sn-devel-104
Both tevent_req_werror and tevent_req_done call tevent_req_finish on a request.
This should not be done. We should only call either of both.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Kai Blin <kai@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Kai Blin <kai@samba.org>
Autobuild-Date(master): Thu Aug 6 14:06:52 CEST 2015 on sn-devel-104
recs[i].wtype is == DNS_TYPE_CNAME, and my understanding of the union is that
data.cname is filled. We get away with this, because ipv4 and ipv6 have the
same char * representation, but it's confusing.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ira Cooper <ira@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Tue Aug 4 13:41:17 CEST 2015 on sn-devel-104
