diff options
Diffstat (limited to 'modules/caddytls')
| -rw-r--r-- | modules/caddytls/tls.go | 56 |
1 files changed, 48 insertions, 8 deletions
diff --git a/modules/caddytls/tls.go b/modules/caddytls/tls.go index 2a05d5235..14965533e 100644 --- a/modules/caddytls/tls.go +++ b/modules/caddytls/tls.go @@ -91,7 +91,8 @@ type TLS struct { // set of subjects with managed certificates, // and hashes of manually-loaded certificates - managing, loaded map[string]struct{} + // (managing's value is an optional issuer key, for distinction) + managing, loaded map[string]string } // CaddyModule returns the Caddy module information. @@ -112,7 +113,7 @@ func (t *TLS) Provision(ctx caddy.Context) error { t.ctx = ctx t.logger = ctx.Logger() repl := caddy.NewReplacer() - t.managing, t.loaded = make(map[string]struct{}), make(map[string]struct{}) + t.managing, t.loaded = make(map[string]string), make(map[string]string) // set up a new certificate cache; this (re)loads all certificates cacheOpts := certmagic.CacheOptions{ @@ -266,7 +267,7 @@ func (t *TLS) Provision(ctx caddy.Context) error { if err != nil { return fmt.Errorf("caching unmanaged certificate: %v", err) } - t.loaded[hash] = struct{}{} + t.loaded[hash] = "" } } @@ -358,10 +359,27 @@ func (t *TLS) Cleanup() error { // compute which certificates were managed or loaded into the cert cache by this // app instance (which is being stopped) that are not managed or loaded by the // new app instance (which just started), and remove them from the cache - var noLongerManaged, noLongerLoaded []string - for subj := range t.managing { - if _, ok := nextTLSApp.managing[subj]; !ok { - noLongerManaged = append(noLongerManaged, subj) + var noLongerManaged []certmagic.SubjectIssuer + var reManage, noLongerLoaded []string + for subj, currentIssuerKey := range t.managing { + // It's a bit nuanced: managed certs can sometimes be different enough that we have to + // swap them out for a different one, even if they are for the same subject/domain. + // We consider "private" certs (internal CA/locally-trusted/etc) to be significantly + // distinct from "public" certs (production CAs/globally-trusted/etc) because of the + // implications when it comes to actual deployments: switching between an internal CA + // and a production CA, for example, is quite significant. Switching from one public CA + // to another, however, is not, and for our purposes we consider those to be the same. + // Anyway, if the next TLS app does not manage a cert for this name at all, definitely + // remove it from the cache. But if it does, and it's not the same kind of issuer/CA + // as we have, also remove it, so that it can swap it out for the right one. + if nextIssuerKey, ok := nextTLSApp.managing[subj]; !ok || nextIssuerKey != currentIssuerKey { + // next app is not managing a cert for this domain at all or is using a different issuer, so remove it + noLongerManaged = append(noLongerManaged, certmagic.SubjectIssuer{Subject: subj, IssuerKey: currentIssuerKey}) + + // then, if the next app is managing a cert for this name, but with a different issuer, re-manage it + if ok && nextIssuerKey != currentIssuerKey { + reManage = append(reManage, subj) + } } } for hash := range t.loaded { @@ -370,10 +388,19 @@ func (t *TLS) Cleanup() error { } } + // remove the certs certCacheMu.RLock() certCache.RemoveManaged(noLongerManaged) certCache.Remove(noLongerLoaded) certCacheMu.RUnlock() + + // give the new TLS app a "kick" to manage certs that it is configured for + // with its own configuration instead of the one we just evicted + if err := nextTLSApp.Manage(reManage); err != nil { + t.logger.Error("re-managing unloaded certificates with new config", + zap.Strings("subjects", reManage), + zap.Error(err)) + } } else { // no more TLS app running, so delete in-memory cert cache certCache.Stop() @@ -407,7 +434,20 @@ func (t *TLS) Manage(names []string) error { return fmt.Errorf("automate: manage %v: %v", names, err) } for _, name := range names { - t.managing[name] = struct{}{} + // certs that are issued solely by our internal issuer are a little bit of + // a special case: if you have an initial config that manages example.com + // using internal CA, then after testing it you switch to a production CA, + // you wouldn't want to keep using the same self-signed cert, obviously; + // so we differentiate these by associating the subject with its issuer key; + // we do this because CertMagic has no notion of "InternalIssuer" like we + // do, so we have to do this logic ourselves + var issuerKey string + if len(ap.Issuers) == 1 { + if intIss, ok := ap.Issuers[0].(*InternalIssuer); ok && intIss != nil { + issuerKey = intIss.IssuerKey() + } + } + t.managing[name] = issuerKey } } |