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caddytls: Eval replacer on automation policy subjects (#5459)

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Also renamed the field to SubjectsRaw, which can be considered a breaking change but I don't expect this to affect much.
This commit is contained in:
Francis Lavoie 2023-03-27 17:16:22 -04:00 committed by GitHub
parent dd86171d67
commit e16a886814
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 58 additions and 39 deletions
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38
caddyconfig/httpcaddyfile/tlsapp.go
View File

@ -206,8 +206,8 @@ func (st ServerType) buildTLSApp(
}
// associate our new automation policy with this server block's hosts
ap.Subjects = sblock.hostsFromKeysNotHTTP(httpPort)
sort.Strings(ap.Subjects) // solely for deterministic test results
ap.SubjectsRaw = sblock.hostsFromKeysNotHTTP(httpPort)
sort.Strings(ap.SubjectsRaw) // solely for deterministic test results
// if a combination of public and internal names were given
// for this same server block and no issuer was specified, we
@ -217,7 +217,7 @@ func (st ServerType) buildTLSApp(
var ap2 *caddytls.AutomationPolicy
if len(ap.Issuers) == 0 {
var internal, external []string
for _, s := range ap.Subjects {
for _, s := range ap.SubjectsRaw {
if !certmagic.SubjectQualifiesForCert(s) {
return nil, warnings, fmt.Errorf("subject does not qualify for certificate: '%s'", s)
}
@ -235,10 +235,10 @@ func (st ServerType) buildTLSApp(
}
}
if len(external) > 0 && len(internal) > 0 {
ap.Subjects = external
ap.SubjectsRaw = external
apCopy := *ap
ap2 = &apCopy
ap2.Subjects = internal
ap2.SubjectsRaw = internal
ap2.IssuersRaw = []json.RawMessage{caddyconfig.JSONModuleObject(caddytls.InternalIssuer{}, "module", "internal", &warnings)}
}
}
@ -339,14 +339,14 @@ func (st ServerType) buildTLSApp(
for h := range httpsHostsSharedWithHostlessKey {
al = append(al, h)
if !certmagic.SubjectQualifiesForPublicCert(h) {
internalAP.Subjects = append(internalAP.Subjects, h)
internalAP.SubjectsRaw = append(internalAP.SubjectsRaw, h)
}
}
}
if len(al) > 0 {
tlsApp.CertificatesRaw["automate"] = caddyconfig.JSON(al, &warnings)
}
if len(internalAP.Subjects) > 0 {
if len(internalAP.SubjectsRaw) > 0 {
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
@ -412,7 +412,7 @@ func (st ServerType) buildTLSApp(
// for convenience)
automationHostSet := make(map[string]struct{})
for _, ap := range tlsApp.Automation.Policies {
for _, s := range ap.Subjects {
for _, s := range ap.SubjectsRaw {
if _, ok := automationHostSet[s]; ok {
return nil, warnings, fmt.Errorf("hostname appears in more than one automation policy, making certificate management ambiguous: %s", s)
}
@ -533,7 +533,7 @@ func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls
if automationPolicyIsSubset(aps[j], aps[i]) {
return false
}
return len(aps[i].Subjects) > len(aps[j].Subjects)
return len(aps[i].SubjectsRaw) > len(aps[j].SubjectsRaw)
})
emptyAPCount := 0
@ -541,7 +541,7 @@ func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls
// compute the number of empty policies (disregarding subjects) - see #4128
emptyAP := new(caddytls.AutomationPolicy)
for i := 0; i < len(aps); i++ {
emptyAP.Subjects = aps[i].Subjects
emptyAP.SubjectsRaw = aps[i].SubjectsRaw
if reflect.DeepEqual(aps[i], emptyAP) {
emptyAPCount++
if !automationPolicyHasAllPublicNames(aps[i]) {
@ -583,7 +583,7 @@ outer:
aps[i].KeyType == aps[j].KeyType &&
aps[i].OnDemand == aps[j].OnDemand &&
aps[i].RenewalWindowRatio == aps[j].RenewalWindowRatio {
if len(aps[i].Subjects) > 0 && len(aps[j].Subjects) == 0 {
if len(aps[i].SubjectsRaw) > 0 && len(aps[j].SubjectsRaw) == 0 {
// later policy (at j) has no subjects ("catch-all"), so we can
// remove the identical-but-more-specific policy that comes first
// AS LONG AS it is not shadowed by another policy before it; e.g.
@ -598,9 +598,9 @@ outer:
}
} else {
// avoid repeated subjects
for _, subj := range aps[j].Subjects {
if !sliceContains(aps[i].Subjects, subj) {
aps[i].Subjects = append(aps[i].Subjects, subj)
for _, subj := range aps[j].SubjectsRaw {
if !sliceContains(aps[i].SubjectsRaw, subj) {
aps[i].SubjectsRaw = append(aps[i].SubjectsRaw, subj)
}
}
aps = append(aps[:j], aps[j+1:]...)
@ -616,15 +616,15 @@ outer:
// automationPolicyIsSubset returns true if a's subjects are a subset
// of b's subjects.
func automationPolicyIsSubset(a, b *caddytls.AutomationPolicy) bool {
if len(b.Subjects) == 0 {
if len(b.SubjectsRaw) == 0 {
return true
}
if len(a.Subjects) == 0 {
if len(a.SubjectsRaw) == 0 {
return false
}
for _, aSubj := range a.Subjects {
for _, aSubj := range a.SubjectsRaw {
var inSuperset bool
for _, bSubj := range b.Subjects {
for _, bSubj := range b.SubjectsRaw {
if certmagic.MatchWildcard(aSubj, bSubj) {
inSuperset = true
break
@ -662,7 +662,7 @@ func subjectQualifiesForPublicCert(ap *caddytls.AutomationPolicy, subj string) b
}
func automationPolicyHasAllPublicNames(ap *caddytls.AutomationPolicy) bool {
for _, subj := range ap.Subjects {
for _, subj := range ap.SubjectsRaw {
if !subjectQualifiesForPublicCert(ap, subj) {
return false
}

4
caddyconfig/httpcaddyfile/tlsapp_test.go
View File

@ -47,8 +47,8 @@ func TestAutomationPolicyIsSubset(t *testing.T) {
expect: false,
},
} {
apA := &caddytls.AutomationPolicy{Subjects: test.a}
apB := &caddytls.AutomationPolicy{Subjects: test.b}
apA := &caddytls.AutomationPolicy{SubjectsRaw: test.a}
apB := &caddytls.AutomationPolicy{SubjectsRaw: test.b}
if actual := automationPolicyIsSubset(apA, apB); actual != test.expect {
t.Errorf("Test %d: Expected %t but got %t (A: %v B: %v)", i, test.expect, actual, test.a, test.b)
}

6
modules/caddyhttp/autohttps.go
View File

@ -285,7 +285,7 @@ uniqueDomainsLoop:
// one automation policy would be confusing and an error
if app.tlsApp.Automation != nil {
for _, ap := range app.tlsApp.Automation.Policies {
for _, apHost := range ap.Subjects {
for _, apHost := range ap.Subjects() {
if apHost == d {
continue uniqueDomainsLoop
}
@ -518,7 +518,7 @@ func (app *App) createAutomationPolicies(ctx caddy.Context, internalNames []stri
}
// while we're here, is this the catch-all/base policy?
if !foundBasePolicy && len(ap.Subjects) == 0 {
if !foundBasePolicy && len(ap.SubjectsRaw) == 0 {
basePolicy = ap
foundBasePolicy = true
}
@ -634,7 +634,7 @@ func (app *App) createAutomationPolicies(ctx caddy.Context, internalNames []stri
// rather they just want to change the CA for the set
// of names that would normally use the production API;
// anyway, that gets into the weeds a bit...
newPolicy.Subjects = internalNames
newPolicy.SubjectsRaw = internalNames
newPolicy.Issuers = []certmagic.Issuer{internalIssuer}
err := app.tlsApp.AddAutomationPolicy(newPolicy)
if err != nil {

2
modules/caddyhttp/reverseproxy/command.go
View File

@ -259,7 +259,7 @@ func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
tlsApp := caddytls.TLS{
Automation: &caddytls.AutomationConfig{
Policies: []*caddytls.AutomationPolicy{{
Subjects: []string{fromAddr.Host},
SubjectsRaw: []string{fromAddr.Host},
IssuersRaw: []json.RawMessage{json.RawMessage(`{"module":"internal"}`)},
}},
},

20
modules/caddytls/automation.go
View File

@ -85,7 +85,7 @@ type AutomationConfig struct {
// TLS app to properly provision a new policy.
type AutomationPolicy struct {
// Which subjects (hostnames or IP addresses) this policy applies to.
Subjects []string `json:"subjects,omitempty"`
SubjectsRaw []string `json:"subjects,omitempty"`
// The modules that may issue certificates. Default: internal if all
// subjects do not qualify for public certificates; othewise acme and
@ -147,12 +147,21 @@ type AutomationPolicy struct {
Issuers []certmagic.Issuer `json:"-"`
Managers []certmagic.Manager `json:"-"`
subjects []string
magic *certmagic.Config
storage certmagic.Storage
}
// Provision sets up ap and builds its underlying CertMagic config.
func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
// replace placeholders in subjects to allow environment variables
repl := caddy.NewReplacer()
subjects := make([]string, len(ap.SubjectsRaw))
for i, sub := range ap.SubjectsRaw {
subjects[i] = repl.ReplaceAll(sub, "")
}
ap.subjects = subjects
// policy-specific storage implementation
if ap.StorageRaw != nil {
val, err := tlsApp.ctx.LoadModule(ap, "StorageRaw")
@ -289,6 +298,11 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
return nil
}
// Subjects returns the list of subjects with all placeholders replaced.
func (ap *AutomationPolicy) Subjects() []string {
return ap.subjects
}
func (ap *AutomationPolicy) onlyInternalIssuer() bool {
if len(ap.Issuers) != 1 {
return false
@ -301,10 +315,10 @@ func (ap *AutomationPolicy) onlyInternalIssuer() bool {
// or is the "default" policy (i.e. no subjects) which is unbounded.
func (ap *AutomationPolicy) isWildcardOrDefault() bool {
isWildcardOrDefault := false
if len(ap.Subjects) == 0 {
if len(ap.subjects) == 0 {
isWildcardOrDefault = true
}
for _, sub := range ap.Subjects {
for _, sub := range ap.subjects {
if strings.HasPrefix(sub, "*") {
isWildcardOrDefault = true
break

21
modules/caddytls/tls.go
View File

@ -126,7 +126,12 @@ func (t *TLS) Provision(ctx caddy.Context) error {
// special case; these will be loaded in later using our automation facilities,
// which we want to avoid doing during provisioning
if automateNames, ok := modIface.(*AutomateLoader); ok && automateNames != nil {
t.automateNames = []string(*automateNames)
repl := caddy.NewReplacer()
subjects := make([]string, len(*automateNames))
for i, sub := range *automateNames {
subjects[i] = repl.ReplaceAll(sub, "")
}
t.automateNames = subjects
} else {
return fmt.Errorf("loading certificates with 'automate' requires array of strings, got: %T", modIface)
}
@ -231,13 +236,13 @@ func (t *TLS) Validate() error {
var hasDefault bool
hostSet := make(map[string]int)
for i, ap := range t.Automation.Policies {
if len(ap.Subjects) == 0 {
if len(ap.subjects) == 0 {
if hasDefault {
return fmt.Errorf("automation policy %d is the second policy that acts as default/catch-all, but will never be used", i)
}
hasDefault = true
}
for _, h := range ap.Subjects {
for _, h := range ap.subjects {
if first, ok := hostSet[h]; ok {
return fmt.Errorf("automation policy %d: cannot apply more than one automation policy to host: %s (first match in policy %d)", i, h, first)
}
@ -388,8 +393,8 @@ func (t *TLS) AddAutomationPolicy(ap *AutomationPolicy) error {
// first see if existing is superset of ap for all names
var otherIsSuperset bool
outer:
for _, thisSubj := range ap.Subjects {
for _, otherSubj := range existing.Subjects {
for _, thisSubj := range ap.subjects {
for _, otherSubj := range existing.subjects {
if certmagic.MatchWildcard(thisSubj, otherSubj) {
otherIsSuperset = true
break outer
@ -398,7 +403,7 @@ func (t *TLS) AddAutomationPolicy(ap *AutomationPolicy) error {
}
// if existing AP is a superset or if it contains fewer names (i.e. is
// more general), then new AP is more specific, so insert before it
if otherIsSuperset || len(existing.Subjects) < len(ap.Subjects) {
if otherIsSuperset || len(existing.SubjectsRaw) < len(ap.SubjectsRaw) {
t.Automation.Policies = append(t.Automation.Policies[:i],
append([]*AutomationPolicy{ap}, t.Automation.Policies[i:]...)...)
return nil
@ -420,10 +425,10 @@ func (t *TLS) getConfigForName(name string) *certmagic.Config {
// public certificate or not.
func (t *TLS) getAutomationPolicyForName(name string) *AutomationPolicy {
for _, ap := range t.Automation.Policies {
if len(ap.Subjects) == 0 {
if len(ap.subjects) == 0 {
return ap // no host filter is an automatic match
}
for _, h := range ap.Subjects {
for _, h := range ap.subjects {
if certmagic.MatchWildcard(name, h) {
return ap
}