diff options
Diffstat (limited to 'modules/caddytls/connpolicy.go')
| -rw-r--r-- | modules/caddytls/connpolicy.go | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/modules/caddytls/connpolicy.go b/modules/caddytls/connpolicy.go index cdc9b9d..9c61c72 100644 --- a/modules/caddytls/connpolicy.go +++ b/modules/caddytls/connpolicy.go @@ -23,8 +23,8 @@ import ( "strings" "github.com/caddyserver/caddy/v2" + "github.com/caddyserver/certmagic" "github.com/go-acme/lego/v3/challenge/tlsalpn01" - "github.com/mholt/certmagic" ) // ConnectionPolicies is an ordered group of connection policies; @@ -32,16 +32,15 @@ import ( // connections at handshake-time. type ConnectionPolicies []*ConnectionPolicy -// TLSConfig converts the group of policies to a standard-lib-compatible -// TLS configuration which selects the first matching policy based on -// the ClientHello. -func (cp ConnectionPolicies) TLSConfig(ctx caddy.Context) (*tls.Config, error) { - // set up each of the connection policies +// Provision sets up each connection policy. It should be called +// during the Validate() phase, after the TLS app (if any) is +// already set up. +func (cp ConnectionPolicies) Provision(ctx caddy.Context) error { for i, pol := range cp { // matchers mods, err := ctx.LoadModule(pol, "MatchersRaw") if err != nil { - return nil, fmt.Errorf("loading handshake matchers: %v", err) + return fmt.Errorf("loading handshake matchers: %v", err) } for _, modIface := range mods.(map[string]interface{}) { cp[i].matchers = append(cp[i].matchers, modIface.(ConnectionMatcher)) @@ -51,20 +50,24 @@ func (cp ConnectionPolicies) TLSConfig(ctx caddy.Context) (*tls.Config, error) { if pol.CertSelection != nil { val, err := ctx.LoadModule(pol, "CertSelection") if err != nil { - return nil, fmt.Errorf("loading certificate selection module: %s", err) + return fmt.Errorf("loading certificate selection module: %s", err) } cp[i].certSelector = val.(certmagic.CertificateSelector) } - } - // pre-build standard TLS configs so we don't have to at handshake-time - for i := range cp { - err := cp[i].buildStandardTLSConfig(ctx) + // pre-build standard TLS config so we don't have to at handshake-time + err = pol.buildStandardTLSConfig(ctx) if err != nil { - return nil, fmt.Errorf("connection policy %d: building standard TLS config: %s", i, err) + return fmt.Errorf("connection policy %d: building standard TLS config: %s", i, err) } } + return nil +} + +// TLSConfig returns a standard-lib-compatible TLS configuration which +// selects the first matching policy based on the ClientHello. +func (cp ConnectionPolicies) TLSConfig(ctx caddy.Context) *tls.Config { // using ServerName to match policies is extremely common, especially in configs // with lots and lots of different policies; we can fast-track those by indexing // them by SNI, so we don't have to iterate potentially thousands of policies @@ -102,7 +105,7 @@ func (cp ConnectionPolicies) TLSConfig(ctx caddy.Context) (*tls.Config, error) { return nil, fmt.Errorf("no server TLS configuration available for ClientHello: %+v", hello) }, - }, nil + } } // ConnectionPolicy specifies the logic for handling a TLS handshake. @@ -137,6 +140,10 @@ type ConnectionPolicy struct { // Enables and configures TLS client authentication. ClientAuthentication *ClientAuthentication `json:"client_authentication,omitempty"` + // DefaultSNI becomes the ServerName in a ClientHello if there + // is no policy configured for the empty SNI value. + DefaultSNI string `json:"default_sni,omitempty"` + matchers []ConnectionMatcher certSelector certmagic.CertificateSelector @@ -158,15 +165,24 @@ func (p *ConnectionPolicy) buildStandardTLSConfig(ctx caddy.Context) error { NextProtos: p.ALPN, PreferServerCipherSuites: true, GetCertificate: func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) { - cfgTpl, err := tlsApp.getConfigForName(hello.ServerName) - if err != nil { - return nil, fmt.Errorf("getting config for name %s: %v", hello.ServerName, err) - } - newCfg := certmagic.New(tlsApp.certCache, cfgTpl) + // TODO: I don't love how this works: we pre-build certmagic configs + // so that handshakes are faster. Unfortunately, certmagic configs are + // comprised of settings from both a TLS connection policy and a TLS + // automation policy. The only two fields (as of March 2020; v2 beta 16) + // of a certmagic config that come from the TLS connection policy are + // CertSelection and DefaultServerName, so an automation policy is what + // builds the base certmagic config. Since the pre-built config is + // shared, I don't think we can change any of its fields per-handshake, + // hence the awkward shallow copy (dereference) here and the subsequent + // changing of some of its fields. I'm worried this dereference allocates + // more at handshake-time, but I don't know how to practically pre-build + // a certmagic config for each combination of conn policy + automation policy... + cfg := *tlsApp.getConfigForName(hello.ServerName) if p.certSelector != nil { - newCfg.CertSelection = p.certSelector + cfg.CertSelection = p.certSelector } - return newCfg.GetCertificate(hello) + cfg.DefaultServerName = p.DefaultSNI + return cfg.GetCertificate(hello) }, MinVersion: tls.VersionTLS12, MaxVersion: tls.VersionTLS13, @@ -240,8 +256,6 @@ func (p *ConnectionPolicy) buildStandardTLSConfig(ctx caddy.Context) error { } } - // TODO: other fields - setDefaultTLSParams(cfg) p.stdTLSConfig = cfg |