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caddytls: Configurable fallback SNI (#5527)

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* Initial implementation of fallback_sni

* Apply upstream patch
This commit is contained in:
Matt Holt 2023-05-10 14:29:29 -06:00 committed by GitHub
parent 808b05c3b4
commit faf0399e80
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 26 additions and 5 deletions
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11
caddyconfig/httpcaddyfile/httptype.go
View file

@ -413,6 +413,7 @@ func (st *ServerType) serversFromPairings(
) (map[string]*caddyhttp.Server, error) {
servers := make(map[string]*caddyhttp.Server)
defaultSNI := tryString(options["default_sni"], warnings)
fallbackSNI := tryString(options["fallback_sni"], warnings)
httpPort := strconv.Itoa(caddyhttp.DefaultHTTPPort)
if hp, ok := options["http_port"].(int); ok {
@ -570,6 +571,11 @@ func (st *ServerType) serversFromPairings(
cp.DefaultSNI = defaultSNI
break
}
if h == fallbackSNI {
hosts = append(hosts, "")
cp.FallbackSNI = fallbackSNI
break
}
}
if len(hosts) > 0 {
@ -578,6 +584,7 @@ func (st *ServerType) serversFromPairings(
}
} else {
cp.DefaultSNI = defaultSNI
cp.FallbackSNI = fallbackSNI
}
// only append this policy if it actually changes something
@ -703,8 +710,8 @@ func (st *ServerType) serversFromPairings(
// policy missing for any HTTPS-enabled hosts, if so, add it... maybe?
if addressQualifiesForTLS &&
!hasCatchAllTLSConnPolicy &&
(len(srv.TLSConnPolicies) > 0 || !autoHTTPSWillAddConnPolicy || defaultSNI != "") {
srv.TLSConnPolicies = append(srv.TLSConnPolicies, &caddytls.ConnectionPolicy{DefaultSNI: defaultSNI})
(len(srv.TLSConnPolicies) > 0 || !autoHTTPSWillAddConnPolicy || defaultSNI != "" || fallbackSNI != "") {
srv.TLSConnPolicies = append(srv.TLSConnPolicies, &caddytls.ConnectionPolicy{DefaultSNI: defaultSNI, FallbackSNI: fallbackSNI})
}
// tidy things up a bit

1
caddyconfig/httpcaddyfile/options.go
View file

@ -33,6 +33,7 @@ func init() {
RegisterGlobalOption("grace_period", parseOptDuration)
RegisterGlobalOption("shutdown_delay", parseOptDuration)
RegisterGlobalOption("default_sni", parseOptSingleString)
RegisterGlobalOption("fallback_sni", parseOptSingleString)
RegisterGlobalOption("order", parseOptOrder)
RegisterGlobalOption("storage", parseOptStorage)
RegisterGlobalOption("storage_clean_interval", parseOptDuration)

2
go.mod
View file

@ -7,7 +7,7 @@ require (
github.com/Masterminds/sprig/v3 v3.2.3
github.com/alecthomas/chroma/v2 v2.7.0
github.com/aryann/difflib v0.0.0-20210328193216-ff5ff6dc229b
github.com/caddyserver/certmagic v0.17.3-0.20230507010158-25b55042e516
github.com/caddyserver/certmagic v0.17.3-0.20230510193943-53140d52202c
github.com/dustin/go-humanize v1.0.1
github.com/go-chi/chi v4.1.2+incompatible
github.com/google/cel-go v0.14.0

4
go.sum
View file

@ -97,8 +97,8 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
github.com/caddyserver/certmagic v0.17.3-0.20230507010158-25b55042e516 h1:D+jLysrPbU0EN+IbLvPuGIpvCi6wgoPmQiKxAQCh+gI=
github.com/caddyserver/certmagic v0.17.3-0.20230507010158-25b55042e516/go.mod h1:e0YLTnXIopZ05bBWCLzpIf1Yvk27Q90FGUmGowFRDY8=
github.com/caddyserver/certmagic v0.17.3-0.20230510193943-53140d52202c h1:pEMS0l8kE/5xxrncv+Qq81fzr29R+zk++E7KAYiyBe4=
github.com/caddyserver/certmagic v0.17.3-0.20230510193943-53140d52202c/go.mod h1:e0YLTnXIopZ05bBWCLzpIf1Yvk27Q90FGUmGowFRDY8=
github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4=

13
modules/caddytls/connpolicy.go
View file

@ -159,6 +159,18 @@ type ConnectionPolicy struct {
// is no policy configured for the empty SNI value.
DefaultSNI string `json:"default_sni,omitempty"`
// FallbackSNI becomes the ServerName in a ClientHello if
// the original ServerName doesn't match any certificates
// in the cache. The use cases for this are very niche;
// typically if a client is a CDN and passes through the
// ServerName of the downstream handshake but can accept
// a certificate with the origin's hostname instead, then
// you would set this to your origin's hostname. Note that
// Caddy must be managing a certificate for this name.
//
// This feature is EXPERIMENTAL and subject to change or removal.
FallbackSNI string `json:"fallback_sni,omitempty"`
// Also known as "SSLKEYLOGFILE", TLS secrets will be written to
// this file in NSS key log format which can then be parsed by
// Wireshark and other tools. This is INSECURE as it allows other
@ -216,6 +228,7 @@ func (p *ConnectionPolicy) buildStandardTLSConfig(ctx caddy.Context) error {
cfg.CertSelection = p.CertSelection
}
cfg.DefaultServerName = p.DefaultSNI
cfg.FallbackServerName = p.FallbackSNI
return cfg.GetCertificate(hello)
},
MinVersion: tls.VersionTLS12,