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httpcaddyfile: Fixes for prefer_wildcard mode (#6636)

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* httpcaddyfile: Fixes for prefer_wildcard mode

The wildcard hosts need to be collected first, then considered after, because there's no guarantee that all non-wildcards will appear after all wildcards when looping. Also we should not add a domain to Skip if it doesn't qualify for TLS anyway.

* Alternate solution by avoiding adding APs altogether if covered by wildcard
This commit is contained in:
Francis Lavoie 2024-10-30 13:09:12 -04:00 committed by GitHub
parent d398898b35
commit b129ed6be8
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GPG key ID: B5690EEEBB952194
4 changed files with 353 additions and 51 deletions
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42
caddyconfig/httpcaddyfile/httptype.go
View file

@ -706,6 +706,16 @@ func (st *ServerType) serversFromPairings(
return specificity(iLongestHost) > specificity(jLongestHost)
})
// collect all hosts that have a wildcard in them
wildcardHosts := []string{}
for _, sblock := range p.serverBlocks {
for _, addr := range sblock.parsedKeys {
if strings.HasPrefix(addr.Host, "*.") {
wildcardHosts = append(wildcardHosts, addr.Host[2:])
}
}
}
var hasCatchAllTLSConnPolicy, addressQualifiesForTLS bool
autoHTTPSWillAddConnPolicy := srv.AutoHTTPS == nil || !srv.AutoHTTPS.Disabled
@ -791,13 +801,6 @@ func (st *ServerType) serversFromPairings(
}
}
wildcardHosts := []string{}
for _, addr := range sblock.parsedKeys {
if strings.HasPrefix(addr.Host, "*.") {
wildcardHosts = append(wildcardHosts, addr.Host[2:])
}
}
for _, addr := range sblock.parsedKeys {
// if server only uses HTTP port, auto-HTTPS will not apply
if listenersUseAnyPortOtherThan(srv.Listen, httpPort) {
@ -813,18 +816,6 @@ func (st *ServerType) serversFromPairings(
}
}
// If prefer wildcard is enabled, then we add hosts that are
// already covered by the wildcard to the skip list
if srv.AutoHTTPS != nil && srv.AutoHTTPS.PreferWildcard && addr.Scheme == "https" {
baseDomain := addr.Host
if idx := strings.Index(baseDomain, "."); idx != -1 {
baseDomain = baseDomain[idx+1:]
}
if !strings.HasPrefix(addr.Host, "*.") && slices.Contains(wildcardHosts, baseDomain) {
srv.AutoHTTPS.Skip = append(srv.AutoHTTPS.Skip, addr.Host)
}
}
// If TLS is specified as directive, it will also result in 1 or more connection policy being created
// Thus, catch-all address with non-standard port, e.g. :8443, can have TLS enabled without
// specifying prefix "https://"
@ -841,6 +832,19 @@ func (st *ServerType) serversFromPairings(
(addr.Scheme != "http" && addr.Port != httpPort && hasTLSEnabled) {
addressQualifiesForTLS = true
}
// If prefer wildcard is enabled, then we add hosts that are
// already covered by the wildcard to the skip list
if addressQualifiesForTLS && srv.AutoHTTPS != nil && srv.AutoHTTPS.PreferWildcard {
baseDomain := addr.Host
if idx := strings.Index(baseDomain, "."); idx != -1 {
baseDomain = baseDomain[idx+1:]
}
if !strings.HasPrefix(addr.Host, "*.") && slices.Contains(wildcardHosts, baseDomain) {
srv.AutoHTTPS.SkipCerts = append(srv.AutoHTTPS.SkipCerts, addr.Host)
}
}
// predict whether auto-HTTPS will add the conn policy for us; if so, we
// may not need to add one for this server
autoHTTPSWillAddConnPolicy = autoHTTPSWillAddConnPolicy &&

91
caddyconfig/httpcaddyfile/tlsapp.go
View file

@ -92,6 +92,25 @@ func (st ServerType) buildTLSApp(
tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP)
}
// collect all hosts that have a wildcard in them, and arent HTTP
wildcardHosts := []string{}
for _, p := range pairings {
var addresses []string
for _, addressWithProtocols := range p.addressesWithProtocols {
addresses = append(addresses, addressWithProtocols.address)
}
if !listenersUseAnyPortOtherThan(addresses, httpPort) {
continue
}
for _, sblock := range p.serverBlocks {
for _, addr := range sblock.parsedKeys {
if strings.HasPrefix(addr.Host, "*.") {
wildcardHosts = append(wildcardHosts, addr.Host[2:])
}
}
}
}
for _, p := range pairings {
// avoid setting up TLS automation policies for a server that is HTTP-only
var addresses []string
@ -115,6 +134,12 @@ func (st ServerType) buildTLSApp(
return nil, warnings, err
}
// make a plain copy so we can compare whether we made any changes
apCopy, err := newBaseAutomationPolicy(options, warnings, true)
if err != nil {
return nil, warnings, err
}
sblockHosts := sblock.hostsFromKeys(false)
if len(sblockHosts) == 0 && catchAllAP != nil {
ap = catchAllAP
@ -217,9 +242,21 @@ func (st ServerType) buildTLSApp(
catchAllAP = ap
}
hostsNotHTTP := sblock.hostsFromKeysNotHTTP(httpPort)
sort.Strings(hostsNotHTTP) // solely for deterministic test results
// if the we prefer wildcards and the AP is unchanged,
// then we can skip this AP because it should be covered
// by an AP with a wildcard
if slices.Contains(autoHTTPS, "prefer_wildcard") {
if hostsCoveredByWildcard(hostsNotHTTP, wildcardHosts) &&
reflect.DeepEqual(ap, apCopy) {
continue
}
}
// associate our new automation policy with this server block's hosts
ap.SubjectsRaw = sblock.hostsFromKeysNotHTTP(httpPort)
sort.Strings(ap.SubjectsRaw) // solely for deterministic test results
ap.SubjectsRaw = hostsNotHTTP
// if a combination of public and internal names were given
// for this same server block and no issuer was specified, we
@ -258,6 +295,7 @@ func (st ServerType) buildTLSApp(
ap2.IssuersRaw = []json.RawMessage{caddyconfig.JSONModuleObject(caddytls.InternalIssuer{}, "module", "internal", &warnings)}
}
}
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
@ -418,10 +456,7 @@ func (st ServerType) buildTLSApp(
}
// consolidate automation policies that are the exact same
tlsApp.Automation.Policies = consolidateAutomationPolicies(
tlsApp.Automation.Policies,
slices.Contains(autoHTTPS, "prefer_wildcard"),
)
tlsApp.Automation.Policies = consolidateAutomationPolicies(tlsApp.Automation.Policies)
// ensure automation policies don't overlap subjects (this should be
// an error at provision-time as well, but catch it in the adapt phase
@ -567,7 +602,7 @@ func newBaseAutomationPolicy(
// consolidateAutomationPolicies combines automation policies that are the same,
// for a cleaner overall output.
func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy, preferWildcard bool) []*caddytls.AutomationPolicy {
func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls.AutomationPolicy {
// sort from most specific to least specific; we depend on this ordering
sort.SliceStable(aps, func(i, j int) bool {
if automationPolicyIsSubset(aps[i], aps[j]) {
@ -652,31 +687,6 @@ outer:
j--
}
}
if preferWildcard {
// remove subjects from i if they're covered by a wildcard in j
iSubjs := aps[i].SubjectsRaw
for iSubj := 0; iSubj < len(iSubjs); iSubj++ {
for jSubj := range aps[j].SubjectsRaw {
if !strings.HasPrefix(aps[j].SubjectsRaw[jSubj], "*.") {
continue
}
if certmagic.MatchWildcard(aps[i].SubjectsRaw[iSubj], aps[j].SubjectsRaw[jSubj]) {
iSubjs = slices.Delete(iSubjs, iSubj, iSubj+1)
iSubj--
break
}
}
}
aps[i].SubjectsRaw = iSubjs
// remove i if it has no subjects left
if len(aps[i].SubjectsRaw) == 0 {
aps = slices.Delete(aps, i, i+1)
i--
continue outer
}
}
}
}
@ -748,3 +758,20 @@ func automationPolicyHasAllPublicNames(ap *caddytls.AutomationPolicy) bool {
func isTailscaleDomain(name string) bool {
return strings.HasSuffix(strings.ToLower(name), ".ts.net")
}
func hostsCoveredByWildcard(hosts []string, wildcards []string) bool {
if len(hosts) == 0 || len(wildcards) == 0 {
return false
}
for _, host := range hosts {
for _, wildcard := range wildcards {
if strings.HasPrefix(host, "*.") {
continue
}
if certmagic.MatchWildcard(host, "*."+wildcard) {
return true
}
}
}
return false
}

3
caddytest/integration/caddyfile_adapt/auto_https_prefer_wildcard.caddyfiletest
View file

@ -74,6 +74,9 @@ foo.example.com {
}
],
"automatic_https": {
"skip_certificates": [
"foo.example.com"
],
"prefer_wildcard": true
}
}

268
caddytest/integration/caddyfile_adapt/auto_https_prefer_wildcard_multi.caddyfiletest Normal file
View file

@ -0,0 +1,268 @@
{
auto_https prefer_wildcard
}
# Covers two domains
*.one.example.com {
tls {
dns mock
}
respond "one fallback"
}
# Is covered, should not get its own AP
foo.one.example.com {
respond "foo one"
}
# This one has its own tls config so it doesn't get covered (escape hatch)
bar.one.example.com {
respond "bar one"
tls bar@bar.com
}
# Covers nothing but AP gets consolidated with the first
*.two.example.com {
tls {
dns mock
}
respond "two fallback"
}
# Is HTTP so it should not cover
http://*.three.example.com {
respond "three fallback"
}
# Has no wildcard coverage so it gets an AP
foo.three.example.com {
respond "foo three"
}
----------
{
"apps": {
"http": {
"servers": {
"srv0": {
"listen": [
":443"
],
"routes": [
{
"match": [
{
"host": [
"foo.three.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "foo three",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
},
{
"match": [
{
"host": [
"foo.one.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "foo one",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
},
{
"match": [
{
"host": [
"bar.one.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "bar one",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
},
{
"match": [
{
"host": [
"*.one.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "one fallback",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
},
{
"match": [
{
"host": [
"*.two.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "two fallback",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
}
],
"automatic_https": {
"skip_certificates": [
"foo.one.example.com",
"bar.one.example.com"
],
"prefer_wildcard": true
}
},
"srv1": {
"listen": [
":80"
],
"routes": [
{
"match": [
{
"host": [
"*.three.example.com"
]
}
],
"handle": [
{
"handler": "subroute",
"routes": [
{
"handle": [
{
"body": "three fallback",
"handler": "static_response"
}
]
}
]
}
],
"terminal": true
}
],
"automatic_https": {
"prefer_wildcard": true
}
}
}
},
"tls": {
"automation": {
"policies": [
{
"subjects": [
"foo.three.example.com"
]
},
{
"subjects": [
"bar.one.example.com"
],
"issuers": [
{
"email": "bar@bar.com",
"module": "acme"
},
{
"ca": "https://acme.zerossl.com/v2/DV90",
"email": "bar@bar.com",
"module": "acme"
}
]
},
{
"subjects": [
"*.one.example.com",
"*.two.example.com"
],
"issuers": [
{
"challenges": {
"dns": {
"provider": {
"name": "mock"
}
}
},
"module": "acme"
}
]
}
]
}
}
}
}