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|
// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package httpcaddyfile
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"sort"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddytls"
"github.com/caddyserver/certmagic"
"github.com/mholt/acmez/acme"
)
func (st ServerType) buildTLSApp(
pairings []sbAddrAssociation,
options map[string]interface{},
warnings []caddyconfig.Warning,
) (*caddytls.TLS, []caddyconfig.Warning, error) {
tlsApp := &caddytls.TLS{CertificatesRaw: make(caddy.ModuleMap)}
var certLoaders []caddytls.CertificateLoader
httpPort := strconv.Itoa(caddyhttp.DefaultHTTPPort)
if hp, ok := options["http_port"].(int); ok {
httpPort = strconv.Itoa(hp)
}
httpsPort := strconv.Itoa(caddyhttp.DefaultHTTPSPort)
if hsp, ok := options["https_port"].(int); ok {
httpsPort = strconv.Itoa(hsp)
}
// count how many server blocks have a TLS-enabled key with
// no host, and find all hosts that share a server block with
// a hostless key, so that they don't get forgotten/omitted
// by auto-HTTPS (since they won't appear in route matchers)
var serverBlocksWithTLSHostlessKey int
httpsHostsSharedWithHostlessKey := make(map[string]struct{})
for _, pair := range pairings {
for _, sb := range pair.serverBlocks {
for _, addr := range sb.keys {
if addr.Host == "" {
// this address has no hostname, but if it's explicitly set
// to HTTPS, then we need to count it as being TLS-enabled
if addr.Scheme == "https" || addr.Port == httpsPort {
serverBlocksWithTLSHostlessKey++
}
// this server block has a hostless key, now
// go through and add all the hosts to the set
for _, otherAddr := range sb.keys {
if otherAddr.Original == addr.Original {
continue
}
if otherAddr.Host != "" && otherAddr.Scheme != "http" && otherAddr.Port != httpPort {
httpsHostsSharedWithHostlessKey[otherAddr.Host] = struct{}{}
}
}
break
}
}
}
}
// a catch-all automation policy is used as a "default" for all subjects that
// don't have custom configuration explicitly associated with them; this
// is only to add if the global settings or defaults are non-empty
catchAllAP, err := newBaseAutomationPolicy(options, warnings, false)
if err != nil {
return nil, warnings, err
}
if catchAllAP != nil {
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP)
}
for _, p := range pairings {
// avoid setting up TLS automation policies for a server that is HTTP-only
if !listenersUseAnyPortOtherThan(p.addresses, httpPort) {
continue
}
for _, sblock := range p.serverBlocks {
// get values that populate an automation policy for this block
ap, err := newBaseAutomationPolicy(options, warnings, true)
if err != nil {
return nil, warnings, err
}
sblockHosts := sblock.hostsFromKeys(false)
if len(sblockHosts) == 0 && catchAllAP != nil {
ap = catchAllAP
}
// on-demand tls
if _, ok := sblock.pile["tls.on_demand"]; ok {
ap.OnDemand = true
}
if keyTypeVals, ok := sblock.pile["tls.key_type"]; ok {
ap.KeyType = keyTypeVals[0].Value.(string)
}
// certificate issuers
if issuerVals, ok := sblock.pile["tls.cert_issuer"]; ok {
var issuers []certmagic.Issuer
for _, issuerVal := range issuerVals {
issuers = append(issuers, issuerVal.Value.(certmagic.Issuer))
}
if ap == catchAllAP && !reflect.DeepEqual(ap.Issuers, issuers) {
return nil, warnings, fmt.Errorf("automation policy from site block is also default/catch-all policy because of key without hostname, and the two are in conflict: %#v != %#v", ap.Issuers, issuers)
}
ap.Issuers = issuers
}
// custom bind host
for _, cfgVal := range sblock.pile["bind"] {
for _, iss := range ap.Issuers {
// if an issuer was already configured and it is NOT an ACME issuer,
// skip, since we intend to adjust only ACME issuers; ensure we
// include any issuer that embeds/wraps an underlying ACME issuer
var acmeIssuer *caddytls.ACMEIssuer
if acmeWrapper, ok := iss.(acmeCapable); ok {
acmeIssuer = acmeWrapper.GetACMEIssuer()
}
if acmeIssuer == nil {
continue
}
// proceed to configure the ACME issuer's bind host, without
// overwriting any existing settings
if acmeIssuer.Challenges == nil {
acmeIssuer.Challenges = new(caddytls.ChallengesConfig)
}
if acmeIssuer.Challenges.BindHost == "" {
// only binding to one host is supported
var bindHost string
if bindHosts, ok := cfgVal.Value.([]string); ok && len(bindHosts) > 0 {
bindHost = bindHosts[0]
}
acmeIssuer.Challenges.BindHost = bindHost
}
}
}
// first make sure this block is allowed to create an automation policy;
// doing so is forbidden if it has a key with no host (i.e. ":443")
// and if there is a different server block that also has a key with no
// host -- since a key with no host matches any host, we need its
// associated automation policy to have an empty Subjects list, i.e. no
// host filter, which is indistinguishable between the two server blocks
// because automation is not done in the context of a particular server...
// this is an example of a poor mapping from Caddyfile to JSON but that's
// the least-leaky abstraction I could figure out
if len(sblockHosts) == 0 {
if serverBlocksWithTLSHostlessKey > 1 {
// this server block and at least one other has a key with no host,
// making the two indistinguishable; it is misleading to define such
// a policy within one server block since it actually will apply to
// others as well
return nil, warnings, fmt.Errorf("cannot make a TLS automation policy from a server block that has a host-less address when there are other TLS-enabled server block addresses lacking a host")
}
if catchAllAP == nil {
// this server block has a key with no hosts, but there is not yet
// a catch-all automation policy (probably because no global options
// were set), so this one becomes it
catchAllAP = ap
}
}
// 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
// if a combination of public and internal names were given
// for this same server block and no issuer was specified, we
// need to separate them out in the automation policies so
// that the internal names can use the internal issuer and
// the other names can use the default/public/ACME issuer
var ap2 *caddytls.AutomationPolicy
if len(ap.Issuers) == 0 {
var internal, external []string
for _, s := range ap.Subjects {
if !certmagic.SubjectQualifiesForCert(s) {
return nil, warnings, fmt.Errorf("subject does not qualify for certificate: '%s'", s)
}
// we don't use certmagic.SubjectQualifiesForPublicCert() because of one nuance:
// names like *.*.tld that may not qualify for a public certificate are actually
// fine when used with OnDemand, since OnDemand (currently) does not obtain
// wildcards (if it ever does, there will be a separate config option to enable
// it that we would need to check here) since the hostname is known at handshake;
// and it is unexpected to switch to internal issuer when the user wants to get
// regular certificates on-demand for a class of certs like *.*.tld.
if subjectQualifiesForPublicCert(ap, s) {
external = append(external, s)
} else {
internal = append(internal, s)
}
}
if len(external) > 0 && len(internal) > 0 {
ap.Subjects = external
apCopy := *ap
ap2 = &apCopy
ap2.Subjects = internal
ap2.IssuersRaw = []json.RawMessage{caddyconfig.JSONModuleObject(caddytls.InternalIssuer{}, "module", "internal", &warnings)}
}
}
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, ap)
if ap2 != nil {
tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, ap2)
}
// certificate loaders
if clVals, ok := sblock.pile["tls.cert_loader"]; ok {
for _, clVal := range clVals {
certLoaders = append(certLoaders, clVal.Value.(caddytls.CertificateLoader))
}
}
}
}
// group certificate loaders by module name, then add to config
if len(certLoaders) > 0 {
loadersByName := make(map[string]caddytls.CertificateLoader)
for _, cl := range certLoaders {
name := caddy.GetModuleName(cl)
// ugh... technically, we may have multiple FileLoader and FolderLoader
// modules (because the tls directive returns one per occurrence), but
// the config structure expects only one instance of each kind of loader
// module, so we have to combine them... instead of enumerating each
// possible cert loader module in a type switch, we can use reflection,
// which works on any cert loaders that are slice types
if reflect.TypeOf(cl).Kind() == reflect.Slice {
combined := reflect.ValueOf(loadersByName[name])
if !combined.IsValid() {
combined = reflect.New(reflect.TypeOf(cl)).Elem()
}
clVal := reflect.ValueOf(cl)
for i := 0; i < clVal.Len(); i++ {
combined = reflect.Append(combined, clVal.Index(i))
}
loadersByName[name] = combined.Interface().(caddytls.CertificateLoader)
}
}
for certLoaderName, loaders := range loadersByName {
tlsApp.CertificatesRaw[certLoaderName] = caddyconfig.JSON(loaders, &warnings)
}
}
// set any of the on-demand options, for if/when on-demand TLS is enabled
if onDemand, ok := options["on_demand_tls"].(*caddytls.OnDemandConfig); ok {
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
tlsApp.Automation.OnDemand = onDemand
}
// set the storage clean interval if configured
if storageCleanInterval, ok := options["storage_clean_interval"].(caddy.Duration); ok {
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
tlsApp.Automation.StorageCleanInterval = storageCleanInterval
}
// if any hostnames appear on the same server block as a key with
// no host, they will not be used with route matchers because the
// hostless key matches all hosts, therefore, it wouldn't be
// considered for auto-HTTPS, so we need to make sure those hosts
// are manually considered for managed certificates; we also need
// to make sure that any of these names which are internal-only
// get internal certificates by default rather than ACME
var al caddytls.AutomateLoader
internalAP := &caddytls.AutomationPolicy{
IssuersRaw: []json.RawMessage{json.RawMessage(`{"module":"internal"}`)},
}
for h := range httpsHostsSharedWithHostlessKey {
al = append(al, h)
if !certmagic.SubjectQualifiesForPublicCert(h) {
internalAP.Subjects = append(internalAP.Subjects, h)
}
}
if len(al) > 0 {
tlsApp.CertificatesRaw["automate"] = caddyconfig.JSON(al, &warnings)
}
if len(internalAP.Subjects) > 0 {
if tlsApp.Automation == nil {
tlsApp.Automation = new(caddytls.AutomationConfig)
}
tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, internalAP)
}
// if there are any global options set for issuers (ACME ones in particular), make sure they
// take effect in every automation policy that does not have any issuers
if tlsApp.Automation != nil {
globalEmail := options["email"]
globalACMECA := options["acme_ca"]
globalACMECARoot := options["acme_ca_root"]
globalACMEDNS := options["acme_dns"]
globalACMEEAB := options["acme_eab"]
globalPreferredChains := options["preferred_chains"]
hasGlobalACMEDefaults := globalEmail != nil || globalACMECA != nil || globalACMECARoot != nil || globalACMEDNS != nil || globalACMEEAB != nil || globalPreferredChains != nil
if hasGlobalACMEDefaults {
// for _, ap := range tlsApp.Automation.Policies {
for i := 0; i < len(tlsApp.Automation.Policies); i++ {
ap := tlsApp.Automation.Policies[i]
if len(ap.Issuers) == 0 && automationPolicyHasAllPublicNames(ap) {
// for public names, create default issuers which will later be filled in with configured global defaults
// (internal names will implicitly use the internal issuer at auto-https time)
ap.Issuers = caddytls.DefaultIssuers()
// if a specific endpoint is configured, can't use multiple default issuers
if globalACMECA != nil {
if strings.Contains(globalACMECA.(string), "zerossl") {
ap.Issuers = []certmagic.Issuer{&caddytls.ZeroSSLIssuer{ACMEIssuer: new(caddytls.ACMEIssuer)}}
} else {
ap.Issuers = []certmagic.Issuer{new(caddytls.ACMEIssuer)}
}
}
}
}
}
}
// finalize and verify policies; do cleanup
if tlsApp.Automation != nil {
for i, ap := range tlsApp.Automation.Policies {
// ensure all issuers have global defaults filled in
for j, issuer := range ap.Issuers {
err := fillInGlobalACMEDefaults(issuer, options)
if err != nil {
return nil, warnings, fmt.Errorf("filling in global issuer defaults for AP %d, issuer %d: %v", i, j, err)
}
}
// encode all issuer values we created, so they will be rendered in the output
if len(ap.Issuers) > 0 && ap.IssuersRaw == nil {
for _, iss := range ap.Issuers {
issuerName := iss.(caddy.Module).CaddyModule().ID.Name()
ap.IssuersRaw = append(ap.IssuersRaw, caddyconfig.JSONModuleObject(iss, "module", issuerName, &warnings))
}
}
}
// consolidate automation policies that are the exact same
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
// for convenience)
automationHostSet := make(map[string]struct{})
for _, ap := range tlsApp.Automation.Policies {
for _, s := range ap.Subjects {
if _, ok := automationHostSet[s]; ok {
return nil, warnings, fmt.Errorf("hostname appears in more than one automation policy, making certificate management ambiguous: %s", s)
}
automationHostSet[s] = struct{}{}
}
}
// if nothing remains, remove any excess values to clean up the resulting config
if len(tlsApp.Automation.Policies) == 0 {
tlsApp.Automation.Policies = nil
}
if reflect.DeepEqual(tlsApp.Automation, new(caddytls.AutomationConfig)) {
tlsApp.Automation = nil
}
}
return tlsApp, warnings, nil
}
type acmeCapable interface{ GetACMEIssuer() *caddytls.ACMEIssuer }
func fillInGlobalACMEDefaults(issuer certmagic.Issuer, options map[string]interface{}) error {
acmeWrapper, ok := issuer.(acmeCapable)
if !ok {
return nil
}
acmeIssuer := acmeWrapper.GetACMEIssuer()
if acmeIssuer == nil {
return nil
}
globalEmail := options["email"]
globalACMECA := options["acme_ca"]
globalACMECARoot := options["acme_ca_root"]
globalACMEDNS := options["acme_dns"]
globalACMEEAB := options["acme_eab"]
globalPreferredChains := options["preferred_chains"]
if globalEmail != nil && acmeIssuer.Email == "" {
acmeIssuer.Email = globalEmail.(string)
}
if globalACMECA != nil && acmeIssuer.CA == "" {
acmeIssuer.CA = globalACMECA.(string)
}
if globalACMECARoot != nil && !sliceContains(acmeIssuer.TrustedRootsPEMFiles, globalACMECARoot.(string)) {
acmeIssuer.TrustedRootsPEMFiles = append(acmeIssuer.TrustedRootsPEMFiles, globalACMECARoot.(string))
}
if globalACMEDNS != nil && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.DNS == nil) {
acmeIssuer.Challenges = &caddytls.ChallengesConfig{
DNS: &caddytls.DNSChallengeConfig{
ProviderRaw: caddyconfig.JSONModuleObject(globalACMEDNS, "name", globalACMEDNS.(caddy.Module).CaddyModule().ID.Name(), nil),
},
}
}
if globalACMEEAB != nil && acmeIssuer.ExternalAccount == nil {
acmeIssuer.ExternalAccount = globalACMEEAB.(*acme.EAB)
}
if globalPreferredChains != nil && acmeIssuer.PreferredChains == nil {
acmeIssuer.PreferredChains = globalPreferredChains.(*caddytls.ChainPreference)
}
return nil
}
// newBaseAutomationPolicy returns a new TLS automation policy that gets
// its values from the global options map. It should be used as the base
// for any other automation policies. A nil policy (and no error) will be
// returned if there are no default/global options. However, if always is
// true, a non-nil value will always be returned (unless there is an error).
func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddyconfig.Warning, always bool) (*caddytls.AutomationPolicy, error) {
issuers, hasIssuers := options["cert_issuer"]
_, hasLocalCerts := options["local_certs"]
keyType, hasKeyType := options["key_type"]
ocspStapling, hasOCSPStapling := options["ocsp_stapling"]
hasGlobalAutomationOpts := hasIssuers || hasLocalCerts || hasKeyType || hasOCSPStapling
// if there are no global options related to automation policies
// set, then we can just return right away
if !hasGlobalAutomationOpts {
if always {
return new(caddytls.AutomationPolicy), nil
}
return nil, nil
}
ap := new(caddytls.AutomationPolicy)
if hasKeyType {
ap.KeyType = keyType.(string)
}
if hasIssuers && hasLocalCerts {
return nil, fmt.Errorf("global options are ambiguous: local_certs is confusing when combined with cert_issuer, because local_certs is also a specific kind of issuer")
}
if hasIssuers {
ap.Issuers = issuers.([]certmagic.Issuer)
} else if hasLocalCerts {
ap.Issuers = []certmagic.Issuer{new(caddytls.InternalIssuer)}
}
if hasOCSPStapling {
ocspConfig := ocspStapling.(certmagic.OCSPConfig)
ap.DisableOCSPStapling = ocspConfig.DisableStapling
ap.OCSPOverrides = ocspConfig.ResponderOverrides
}
return ap, nil
}
// consolidateAutomationPolicies combines automation policies that are the same,
// for a cleaner overall output.
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]) {
return true
}
if automationPolicyIsSubset(aps[j], aps[i]) {
return false
}
return len(aps[i].Subjects) > len(aps[j].Subjects)
})
emptyAPCount := 0
origLenAPs := len(aps)
// 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
if reflect.DeepEqual(aps[i], emptyAP) {
emptyAPCount++
if !automationPolicyHasAllPublicNames(aps[i]) {
// if this automation policy has internal names, we might as well remove it
// so auto-https can implicitly use the internal issuer
aps = append(aps[:i], aps[i+1:]...)
i--
}
}
}
// If all policies are empty, we can return nil, as there is no need to set any policy
if emptyAPCount == origLenAPs {
return nil
}
// remove or combine duplicate policies
outer:
for i := 0; i < len(aps); i++ {
// compare only with next policies; we sorted by specificity so we must not delete earlier policies
for j := i + 1; j < len(aps); j++ {
// if they're exactly equal in every way, just keep one of them
if reflect.DeepEqual(aps[i], aps[j]) {
aps = append(aps[:j], aps[j+1:]...)
// must re-evaluate current i against next j; can't skip it!
// even if i decrements to -1, will be incremented to 0 immediately
i--
continue outer
}
// if the policy is the same, we can keep just one, but we have
// to be careful which one we keep; if only one has any hostnames
// defined, then we need to keep the one without any hostnames,
// otherwise the one without any subjects (a catch-all) would be
// eaten up by the one with subjects; and if both have subjects, we
// need to combine their lists
if reflect.DeepEqual(aps[i].IssuersRaw, aps[j].IssuersRaw) &&
bytes.Equal(aps[i].StorageRaw, aps[j].StorageRaw) &&
aps[i].MustStaple == aps[j].MustStaple &&
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 {
// 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.
// if policy i is for example.com, policy i+1 is '*.com', and policy
// j is catch-all, we cannot remove policy i because that would
// cause example.com to be served by the less specific policy for
// '*.com', which might be different (yes we've seen this happen)
if automationPolicyShadows(i, aps) >= j {
aps = append(aps[:i], aps[i+1:]...)
i--
continue 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)
}
}
aps = append(aps[:j], aps[j+1:]...)
j--
}
}
}
}
return aps
}
// 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 {
return true
}
if len(a.Subjects) == 0 {
return false
}
for _, aSubj := range a.Subjects {
var inSuperset bool
for _, bSubj := range b.Subjects {
if certmagic.MatchWildcard(aSubj, bSubj) {
inSuperset = true
break
}
}
if !inSuperset {
return false
}
}
return true
}
// automationPolicyShadows returns the index of a policy that aps[i] shadows;
// in other words, for all policies after position i, if that policy covers
// the same subjects but is less specific, that policy's position is returned,
// or -1 if no shadowing is found. For example, if policy i is for
// "foo.example.com" and policy i+2 is for "*.example.com", then i+2 will be
// returned, since that policy is shadowed by i, which is in front.
func automationPolicyShadows(i int, aps []*caddytls.AutomationPolicy) int {
for j := i + 1; j < len(aps); j++ {
if automationPolicyIsSubset(aps[i], aps[j]) {
return j
}
}
return -1
}
// subjectQualifiesForPublicCert is like certmagic.SubjectQualifiesForPublicCert() except
// that this allows domains with multiple wildcard levels like '*.*.example.com' to qualify
// if the automation policy has OnDemand enabled (i.e. this function is more lenient).
func subjectQualifiesForPublicCert(ap *caddytls.AutomationPolicy, subj string) bool {
return !certmagic.SubjectIsInternal(subj) &&
(strings.Count(subj, "*.") < 2 || ap.OnDemand)
}
func automationPolicyHasAllPublicNames(ap *caddytls.AutomationPolicy) bool {
for _, subj := range ap.Subjects {
if !subjectQualifiesForPublicCert(ap, subj) {
return false
}
}
return true
}
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