diff options
Diffstat (limited to 'caddyconfig/httpcaddyfile/tlsapp.go')
| -rw-r--r-- | caddyconfig/httpcaddyfile/tlsapp.go | 295 |
1 files changed, 165 insertions, 130 deletions
diff --git a/caddyconfig/httpcaddyfile/tlsapp.go b/caddyconfig/httpcaddyfile/tlsapp.go index e732957..0ac862e 100644 --- a/caddyconfig/httpcaddyfile/tlsapp.go +++ b/caddyconfig/httpcaddyfile/tlsapp.go @@ -76,30 +76,35 @@ func (st ServerType) buildTLSApp( } } + // 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 { for _, sblock := range p.serverBlocks { // get values that populate an automation policy for this block - var ap *caddytls.AutomationPolicy + ap, err := newBaseAutomationPolicy(options, warnings, true) + if err != nil { + return nil, warnings, err + } sblockHosts := sblock.hostsFromKeys(false) - if len(sblockHosts) == 0 { + if len(sblockHosts) == 0 && catchAllAP != nil { ap = catchAllAP } // on-demand tls if _, ok := sblock.pile["tls.on_demand"]; ok { - if ap == nil { - var err error - ap, err = newBaseAutomationPolicy(options, warnings, true) - if err != nil { - return nil, warnings, err - } - } ap.OnDemand = true } @@ -107,13 +112,6 @@ func (st ServerType) buildTLSApp( if issuerVals, ok := sblock.pile["tls.cert_issuer"]; ok { for _, issuerVal := range issuerVals { issuer := issuerVal.Value.(certmagic.Issuer) - if ap == nil { - var err error - ap, err = newBaseAutomationPolicy(options, warnings, true) - if err != nil { - return nil, warnings, err - } - } if ap == catchAllAP && !reflect.DeepEqual(ap.Issuer, issuer) { 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.Issuer, issuer) } @@ -123,15 +121,6 @@ func (st ServerType) buildTLSApp( // custom bind host for _, cfgVal := range sblock.pile["bind"] { - // either an existing issuer is already configured (and thus, ap is not - // nil), or we need to configure an issuer, so we need ap to be non-nil - if ap == nil { - ap, err = newBaseAutomationPolicy(options, warnings, true) - if err != nil { - return nil, warnings, err - } - } - // if an issuer was already configured and it is NOT an ACME // issuer, skip, since we intend to adjust only ACME issuers var acmeIssuer *caddytls.ACMEIssuer @@ -164,87 +153,74 @@ func (st ServerType) buildTLSApp( ap.Issuer = acmeIssuer // we'll encode it later } - if ap != nil { - if ap.Issuer != nil { - // encode issuer now that it's all set up - issuerName := ap.Issuer.(caddy.Module).CaddyModule().ID.Name() - ap.IssuerRaw = caddyconfig.JSONModuleObject(ap.Issuer, "module", issuerName, &warnings) + // 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") } - - // 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 - } + 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, - // unless, of course, the server block has a key with no hosts, in which - // case its automation policy becomes or blends with the default/global - // automation policy because, of necessity, it applies to all hostnames - // (i.e. it has no Subjects filter) -- in that case, we'll append it last - if ap != catchAllAP { - ap.Subjects = sblockHosts - - // 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 ap.Issuer == nil { - 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 !certmagic.SubjectIsIP(s) && !certmagic.SubjectIsInternal(s) && (strings.Count(s, "*.") < 2 || ap.OnDemand) { - 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.IssuerRaw = caddyconfig.JSONModuleObject(caddytls.InternalIssuer{}, "module", "internal", &warnings) - } + // associate our new automation policy with this server block's hosts + ap.Subjects = sblockHosts + 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 ap.Issuer == nil { + 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) } - 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) + // 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 !certmagic.SubjectIsIP(s) && !certmagic.SubjectIsInternal(s) && (strings.Count(s, "*.") < 2 || ap.OnDemand) { + 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.IssuerRaw = 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 @@ -319,23 +295,17 @@ func (st ServerType) buildTLSApp( tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, internalAP) } - // if there is a global/catch-all automation policy, ensure it goes last - if catchAllAP != nil { - // first, encode its issuer, if there is one - if catchAllAP.Issuer != nil { - issuerName := catchAllAP.Issuer.(caddy.Module).CaddyModule().ID.Name() - catchAllAP.IssuerRaw = caddyconfig.JSONModuleObject(catchAllAP.Issuer, "module", issuerName, &warnings) - } - - // then append it to the end of the policies list - if tlsApp.Automation == nil { - tlsApp.Automation = new(caddytls.AutomationConfig) + // finalize and verify policies; do cleanup + if tlsApp.Automation != nil { + // encode any issuer values we created, so they will be rendered in the output + for _, ap := range tlsApp.Automation.Policies { + if ap.Issuer != nil && ap.IssuerRaw == nil { + // encode issuer now that it's all set up + issuerName := ap.Issuer.(caddy.Module).CaddyModule().ID.Name() + ap.IssuerRaw = caddyconfig.JSONModuleObject(ap.Issuer, "module", issuerName, &warnings) + } } - tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP) - } - // do a little verification & cleanup - if tlsApp.Automation != nil { // consolidate automation policies that are the exact same tlsApp.Automation.Policies = consolidateAutomationPolicies(tlsApp.Automation.Policies) @@ -351,6 +321,14 @@ func (st ServerType) buildTLSApp( 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 @@ -448,12 +426,30 @@ func disambiguateACMEIssuer(acmeIssuer *caddytls.ACMEIssuer) certmagic.Issuer { // 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) + }) + + // remove any empty policies (except subjects, of course) + emptyAP := new(caddytls.AutomationPolicy) for i := 0; i < len(aps); i++ { - for j := 0; j < len(aps); j++ { - if j == i { - continue - } + emptyAP.Subjects = aps[i].Subjects + if reflect.DeepEqual(aps[i], emptyAP) { + aps = append(aps[:i], aps[i+1:]...) + i-- + } + } + // remove or combine duplicate policies + for i := 0; i < len(aps); i++ { + 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:]...) @@ -473,10 +469,17 @@ func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls 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 { - aps = append(aps[:j], aps[j+1:]...) - } else if len(aps[i].Subjects) > 0 && len(aps[j].Subjects) == 0 { - aps = append(aps[:i], aps[i+1:]...) + 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:]...) + } } else { // avoid repeated subjects for _, subj := range aps[j].Subjects { @@ -486,16 +489,48 @@ func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls } aps = append(aps[:j], aps[j+1:]...) } - i-- - break } } } - // ensure any catch-all policies go last - sort.SliceStable(aps, func(i, j int) bool { - return len(aps[i].Subjects) > len(aps[j].Subjects) - }) - 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 +} |