https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3797
Summary: Support for SPF RR (RFC 4408)
Product: Wireshark
Version: 1.2.1
Platform: Other
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: ivan_jr@xxxxxxxxx
Ivan Sy <ivan_jr@xxxxxxxxx> changed:
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SPF RR RFC4408
Build Information:
wireshark 1.2.1
Copyright 1998-2009 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled with GTK+ 2.16.1, with GLib 2.20.1, with libpcap 1.0.0, with libz
1.2.3, without POSIX capabilities, with libpcre 7.8, with SMI 0.4.7, without
c-ares, with ADNS, without Lua, with GnuTLS 2.6.4, with Gcrypt 1.4.4, without
Kerberos, with GeoIP, with PortAudio <= V18, without AirPcap.
Running on FreeBSD 7.2-RELEASE-p1, with libpcap version 1.0.0, GnuTLS 2.6.4,
Gcrypt 1.4.4.
Built using gcc 4.2.1 20070719 [FreeBSD].
--
Support for SPF RR (RFC 4408)
- this has the same format as TXT RR (see section 3.1.1) below.
Currently wireshark 1.2.1 shows this as Unknown type 99
please see attached patch and packet capture of TXT and SPF RRs of the same
name.
fuzz ok
3. SPF Records
An SPF record is a DNS Resource Record (RR) that declares which hosts
are, and are not, authorized to use a domain name for the "HELO" and
"MAIL FROM" identities. Loosely, the record partitions all hosts
into permitted and not-permitted sets (though some hosts might fall
into neither category).
The SPF record is a single string of text. An example record is the
following:
v=spf1 +mx a:colo.example.com/28 -all
This record has a version of "spf1" and three directives: "+mx",
"a:colo.example.com/28" (the + is implied), and "-all".
3.1. Publishing
Domain owners wishing to be SPF compliant must publish SPF records
for the hosts that are used in the "MAIL FROM" and "HELO" identities.
The SPF records are placed in the DNS tree at the host name it
pertains to, not a subdomain under it, such as is done with SRV
records. This is the same whether the TXT or SPF RR type (see
Section 3.1.1) is used.
The example above in Section 3 might be published via these lines in
a domain zone file:
example.com. TXT "v=spf1 +mx a:colo.example.com/28 -all"
smtp-out.example.com. TXT "v=spf1 a -all"
When publishing via TXT records, beware of other TXT records
published there for other purposes. They may cause problems with
size limits (see Section 3.1.4).
3.1.1. DNS Resource Record Types
This document defines a new DNS RR of type SPF, code 99. The format
of this type is identical to the TXT RR [RFC1035]. For either type,
the character content of the record is encoded as [US-ASCII].
It is recognized that the current practice (using a TXT record) is
not optimal, but it is necessary because there are a number of DNS
server and resolver implementations in common use that cannot handle
the new RR type. The two-record-type scheme provides a forward path
to the better solution of using an RR type reserved for this purpose.
An SPF-compliant domain name SHOULD have SPF records of both RR
types. A compliant domain name MUST have a record of at least one
type. If a domain has records of both types, they MUST have
identical content. For example, instead of publishing just one
record as in Section 3.1 above, it is better to publish:
example.com. IN TXT "v=spf1 +mx a:colo.example.com/28 -all"
example.com. IN SPF "v=spf1 +mx a:colo.example.com/28 -all"
Example RRs in this document are shown with the TXT record type;
however, they could be published with the SPF type or with both
types.
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