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Code Issues Releases Activity

SPF Optimizer: Enable the use of TXTMulti records to support longer SPF records (#794)

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* Add multiple string support to SPF optimizer

Notes:

* This implements [RFC 4408][rfc] for the SPF optimizer. Allowing for
more SPF records to fit within the 10 lookups by using multiple strings.
* By default the max size of the TXT remains at 255. Meaning users will
still only get a single 255 length string unless they modify `txtMaxSize`
and opt into this feature.
* The general recommendation when using multiple strings for TXT records
is to keep the size within a single UDP packet. It seems like the
maximum size for this depends on a bunch of factors that are sometimes
outside of your control. A similar tool has a [formula for estimating the
maximum allowed size][formula]. However I felt giving a user
configurable size would fit with the current configuration style that
dnscontrol has. Similar to how dnscontrol recommends only flattening a
record if absolutely needed, I can see this length being increased by
only enough to get you within 10 lookups.

[rfc]: https://tools.ietf.org/html/rfc4408#section-3.1.3
[formula]: https://github.com/oasys/mkspf/blob/master/Overhead.md

* Add a nice comment for the Chunks function
This commit is contained in:
Michael Russell
2020-07-31 19:28:13 +02:00
committed by GitHub
parent 237c573c2a
commit f21c8fc400
6 changed files with 245 additions and 119 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/spf-optimizer.md
View File

@ -105,9 +105,13 @@ The parameters are:
* `overhead1:` "Overhead for the 1st TXT record". When calculating the max length of each TXT record, reduce the maximum for the first TXT record in the chain by this amount.
* `raw:` The label of the unaltered SPF settings. Setting to an empty string `''` will disable this. (Optional. Default: `"_rawspf"`)
* `ttl:` This allows setting a specific TTL on this SPF record. (Optional. Default: using default record TTL)
* `txtMaxSize` The maximum size for each TXT record. Values over 255 will result in [multiple strings][multi-string]. General recommendation is to [not go higher than 450][record-size] so that DNS responses will still fit in a UDP packet. (Optional. Default: `"255"`)
* `parts:` The individual parts of the SPF settings.
* `flatten:` Which includes should be inlined. For safety purposes the flattening is done on an opt-in basis. If `"*"` is listed, all includes will be flattened... this might create more problems than is solves due to length limitations.
[multi-string]: https://tools.ietf.org/html/rfc4408#section-3.1.3
[record-size]: https://tools.ietf.org/html/rfc4408#section-3.1.4
`SPR_BUILDER()` returns multiple `TXT()` records:
* `TXT("@", "v=spf1 .... ~all")`

5
pkg/js/helpers.js
View File

@ -733,6 +733,7 @@ var FRAME = recordBuilder('FRAME');
// split: The template for additional records to be created (default: '_spf%d')
// flatten: A list of domains to be flattened.
// overhead1: Amout of "buffer room" to reserve on the first item in the spf chain.
// txtMaxSize: The maximum size for each TXT string. Values over 255 will result in multiple strings (default: '255')
function SPF_BUILDER(value) {
if (!value.parts || value.parts.length < 2) {
@ -771,6 +772,10 @@ function SPF_BUILDER(value) {
p.overhead1 = value.overhead1;
}
if (value.txtMaxSize) {
p.txtMaxSize = value.txtMaxSize;
}
// Generate a TXT record with the metaparameters.
if (value.ttl) {
r.push(TXT(value.label, rawspf, p, TTL(value.ttl)));

206
pkg/js/static.go
View File

@ -212,110 +212,112 @@ var _escData = map[string]*_escFile{
"/helpers.js": {
name: "helpers.js",
local: "pkg/js/helpers.js",
size: 23999,
size: 24193,
modtime: 0,
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`,
},
}

16
pkg/normalize/flatten.go
View File

@ -58,17 +58,27 @@ func flattenSPFs(cfg *models.DNSConfig) []error {
overhead1 = i
}
// Default txtMaxSize will not result in multiple TXT strings
txtMaxSize := 255
if oh, ok := txt.Metadata["txtMaxSize"]; ok {
i, err := strconv.Atoi(oh)
if err != nil {
errs = append(errs, Warning{fmt.Errorf("split txtMaxSize %q is not an int", oh)})
}
txtMaxSize = i
}
if !strings.Contains(split, "%d") {
errs = append(errs, Warning{fmt.Errorf("Split format `%s` in `%s` is not proper format (should have %%d in it)", split, txt.GetLabelFQDN())})
continue
}
recs := rec.TXTSplit(split+"."+domain.Name, overhead1)
recs := rec.TXTSplit(split+"."+domain.Name, overhead1, txtMaxSize)
for k, v := range recs {
if k == "@" {
txt.SetTargetTXT(v)
txt.SetTargetTXTs(v)
} else {
cp, _ := txt.Copy()
cp.SetTargetTXT(v)
cp.SetTargetTXTs(v)
cp.SetLabelFromFQDN(k, domain.Name)
domain.Records = append(domain.Records, cp)
}

49
pkg/spflib/flatten.go
View File

@ -5,6 +5,31 @@ import (
"strings"
)
// Chunks splits strings into arrays of a certain chunk size. We
// use this to split TXT records into 255 sized chunks for RFC 4408
// https://tools.ietf.org/html/rfc4408#section-3.1.3
// Borrowed from https://stackoverflow.com/a/61469854/11477663
func Chunks(s string, chunkSize int) []string {
if chunkSize >= len(s) {
return []string{s}
}
var chunks []string
chunk := make([]rune, chunkSize)
len := 0
for _, r := range s {
chunk[len] = r
len++
if len == chunkSize {
chunks = append(chunks, string(chunk))
len = 0
}
}
if len > 0 {
chunks = append(chunks, string(chunk[:len]))
}
return chunks
}
// TXT outputs s as a TXT record.
func (s *SPFRecord) TXT() string {
text := "v=spf1"
@ -14,7 +39,10 @@ func (s *SPFRecord) TXT() string {
return text
}
const maxLenDefault = 255
// Maximum length of a single TXT string. Anything
// bigger than this will be split into multiple strings
// if the user has set a txtMaxSize length greater than 255
const txtStringLength = 255
// TXTSplit returns a set of txt records to use for SPF.
// pattern given is used to name all chained spf records.
@ -26,20 +54,20 @@ const maxLenDefault = 255
// overhead of that many bytes. For example, if there are other txt
// records and you wish to reduce the first SPF record size to prevent
// DNS over TCP.
func (s *SPFRecord) TXTSplit(pattern string, overhead int) map[string]string {
m := map[string]string{}
s.split("@", pattern, 1, m, overhead)
func (s *SPFRecord) TXTSplit(pattern string, overhead int, txtMaxSize int) map[string][]string {
m := map[string][]string{}
s.split("@", pattern, 1, m, overhead, txtMaxSize)
return m
}
func (s *SPFRecord) split(thisfqdn string, pattern string, nextIdx int, m map[string]string, overhead int) {
maxLen := maxLenDefault - overhead
func (s *SPFRecord) split(thisfqdn string, pattern string, nextIdx int, m map[string][]string, overhead int, txtMaxSize int) {
maxLen := txtMaxSize - overhead
base := s.TXT()
// simple case. it fits
if len(base) <= maxLen {
m[thisfqdn] = base
m[thisfqdn] = Chunks(base, txtStringLength)
return
}
@ -62,7 +90,7 @@ func (s *SPFRecord) split(thisfqdn string, pattern string, nextIdx int, m map[st
over = true
if addedCount == 0 {
// the first part is too big to include. We kinda have to give up here.
m[thisfqdn] = base
m[thisfqdn] = []string{base}
return
}
}
@ -71,8 +99,9 @@ func (s *SPFRecord) split(thisfqdn string, pattern string, nextIdx int, m map[st
newRec.Parts = append(newRec.Parts, part)
}
}
m[thisfqdn] = thisText + tail
newRec.split(nextFQDN, pattern, nextIdx+1, m, 0)
m[thisfqdn] = Chunks(thisText+tail, txtStringLength)
newRec.split(nextFQDN, pattern, nextIdx+1, m, 0, txtMaxSize)
}
// Flatten optimizes s.

84
pkg/spflib/flatten_test.go
View File

@ -1,6 +1,7 @@
package spflib
import (
"reflect"
"strconv"
"strings"
"testing"
@ -94,6 +95,7 @@ var splitTests = [][]string{
func TestSplit(t *testing.T) {
for _, tst := range splitTests {
overhead := 0
txtMaxSize := 255
v := strings.Split(tst[0], "-")
if len(v) > 1 {
@ -107,17 +109,91 @@ func TestSplit(t *testing.T) {
if err != nil {
t.Fatal(err)
}
res := rec.TXTSplit("_spf%d.stackex.com", overhead)
if res["@"] != tst[2] {
t.Fatalf("Root record wrong. \nExp %s\ngot %s", tst[2], res["@"])
res := rec.TXTSplit("_spf%d.stackex.com", overhead, txtMaxSize)
if res["@"][0] != tst[2] {
t.Fatalf("Root record wrong. \nExp %s\ngot %s", tst[2], res["@"][0])
}
for i := 3; i < len(tst); i += 2 {
fqdn := tst[i]
exp := tst[i+1]
if res[fqdn] != exp {
if res[fqdn][0] != exp {
t.Fatalf("Record %s.\nExp %s\ngot %s", fqdn, exp, res[fqdn])
}
}
})
}
}
func TestMultiStringSplit(t *testing.T) {
var tests = []struct {
description string
unsplitInput string
txtMaxSize int
want map[string][]string
}{
{
description: "basic multiple strings",
unsplitInput: "v=spf1 -all",
txtMaxSize: 255,
want: map[string][]string{
"@": {
"v=spf1 -all",
},
},
},
{
description: "too long to split, not enough txtMaxSize for a multi string",
unsplitInput: "v=spf1 include:a0123456789012345678901234567890123456789012345sssss6789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.com -all",
txtMaxSize: 255,
want: map[string][]string{
"@": {
"v=spf1 include:a0123456789012345678901234567890123456789012345sssss6789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.com -all",
},
},
},
{
description: "can actually be split with multiple txt strings",
unsplitInput: "v=spf1 include:a0123456789012345678901234567890123456789012345sssss6789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.com -all",
txtMaxSize: 450,
want: map[string][]string{
"@": {
// First string
"v=spf1 include:a0123456789012345678901234567890123456789012345sssss6789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.com",
// Second string
" -all",
},
},
},
{
description: "really big with multiple txt strings",
unsplitInput: "v=spf1 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178" +
" ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178" +
" ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 -all",
txtMaxSize: 450,
want: map[string][]string{
"@": {
"v=spf1 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.",
"192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 include:_spf1.stackex.com -all",
},
"_spf1.stackex.com": {
"v=spf1 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.",
"192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 ip4:200.192.169.178 -all",
},
},
},
}
for _, test := range tests {
t.Run(test.description, func(t *testing.T) {
rec, err := Parse(test.unsplitInput, nil)
if err != nil {
t.Fatal(err)
}
got := rec.TXTSplit("_spf%d.stackex.com", 0, test.txtMaxSize)
if !reflect.DeepEqual(got, test.want) {
t.Errorf("got %v want %v", got, test.want)
}
})
}
}