From 66863aad3beb480a26664c77b73eb2ff7fcab754 Mon Sep 17 00:00:00 2001 From: Matt Holt Date: Tue, 11 Aug 2020 08:58:06 -0600 Subject: caddytls: Add support for ZeroSSL; add Caddyfile support for issuers (#3633) * caddytls: Add support for ZeroSSL; add Caddyfile support for issuers Configuring issuers explicitly in a Caddyfile is not easily compatible with existing ACME-specific parameters such as email or acme_ca which infer the kind of issuer it creates (this is complicated now because the ZeroSSL issuer wraps the ACME issuer)... oh well, we can revisit that later if we need to. New Caddyfile global option: { cert_issuer ... } Or, alternatively, as a tls subdirective: tls { issuer ... } For example, to use ZeroSSL with an API key: { cert_issuser zerossl API_KEY } For now, that still uses ZeroSSL's ACME endpoint; it fetches EAB credentials for you. You can also provide the EAB credentials directly just like any other ACME endpoint: { cert_issuer acme { eab KEY_ID MAC_KEY } } All these examples use the new global option (or tls subdirective). You can still use traditional/existing options with ZeroSSL, since it's just another ACME endpoint: { acme_ca https://acme.zerossl.com/v2/DV90 acme_eab KEY_ID MAC_KEY } That's all there is to it. You just can't mix-and-match acme_* options with cert_issuer, because it becomes confusing/ambiguous/complicated to merge the settings. * Fix broken test This test was asserting buggy behavior, oops - glad this branch both discovers and fixes the bug at the same time! * Fix broken test (post-merge) * Update modules/caddytls/acmeissuer.go Fix godoc comment Co-authored-by: Francis Lavoie * Add support for ZeroSSL's EAB-by-email endpoint Also transform the ACMEIssuer into ZeroSSLIssuer implicitly if set to the ZeroSSL endpoint without EAB (the ZeroSSLIssuer is needed to generate EAB if not already provided); this is now possible with either an API key or an email address. * go.mod: Use latest certmagic, acmez, and x/net * Wrap underlying logic rather than repeating it Oops, duh * Form-encode email info into request body for EAB endpoint Co-authored-by: Francis Lavoie --- caddyconfig/httpcaddyfile/builtins.go | 52 +++++++++++++++++++++++++++++------ caddyconfig/httpcaddyfile/options.go | 29 +++++++++++++++++++ caddyconfig/httpcaddyfile/tlsapp.go | 40 +++++++++++++++++++++------ 3 files changed, 105 insertions(+), 16 deletions(-) (limited to 'caddyconfig/httpcaddyfile') diff --git a/caddyconfig/httpcaddyfile/builtins.go b/caddyconfig/httpcaddyfile/builtins.go index 520796d..e8fbf23 100644 --- a/caddyconfig/httpcaddyfile/builtins.go +++ b/caddyconfig/httpcaddyfile/builtins.go @@ -29,6 +29,7 @@ import ( "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" "github.com/caddyserver/caddy/v2/modules/caddyhttp" "github.com/caddyserver/caddy/v2/modules/caddytls" + "github.com/caddyserver/certmagic" "github.com/mholt/acmez/acme" "go.uber.org/zap/zapcore" ) @@ -76,6 +77,7 @@ func parseBind(h Helper) ([]ConfigValue, error) { // ca_root // dns // on_demand +// issuer ... // } // func parseTLS(h Helper) ([]ConfigValue, error) { @@ -85,6 +87,7 @@ func parseTLS(h Helper) ([]ConfigValue, error) { var certSelector caddytls.CustomCertSelectionPolicy var acmeIssuer *caddytls.ACMEIssuer var internalIssuer *caddytls.InternalIssuer + var issuer certmagic.Issuer var onDemand bool for h.Next() { @@ -276,6 +279,28 @@ func parseTLS(h Helper) ([]ConfigValue, error) { MACKey: arg[1], } + case "issuer": + if !h.NextArg() { + return nil, h.ArgErr() + } + modName := h.Val() + mod, err := caddy.GetModule("tls.issuance." + modName) + if err != nil { + return nil, h.Errf("getting issuer module '%s': %v", modName, err) + } + unm, ok := mod.New().(caddyfile.Unmarshaler) + if !ok { + return nil, h.Errf("issuer module '%s' is not a Caddyfile unmarshaler", mod.ID) + } + err = unm.UnmarshalCaddyfile(h.NewFromNextSegment()) + if err != nil { + return nil, err + } + issuer, ok = unm.(certmagic.Issuer) + if !ok { + return nil, h.Errf("module %s is not a certmagic.Issuer", mod.ID) + } + case "dns": if !h.NextArg() { return nil, h.ArgErr() @@ -350,7 +375,24 @@ func parseTLS(h Helper) ([]ConfigValue, error) { // the logic to support this would be complex return nil, h.Err("cannot use both ACME and internal issuers in same server block") } - if acmeIssuer != nil { + if issuer != nil && (acmeIssuer != nil || internalIssuer != nil) { + // similarly, the logic to support this would be complex + return nil, h.Err("when defining an issuer, all its config must be in its block, rather than from separate tls subdirectives") + } + switch { + case issuer != nil: + configVals = append(configVals, ConfigValue{ + Class: "tls.cert_issuer", + Value: issuer, + }) + + case internalIssuer != nil: + configVals = append(configVals, ConfigValue{ + Class: "tls.cert_issuer", + Value: internalIssuer, + }) + + case acmeIssuer != nil: // fill in global defaults, if configured if email := h.Option("email"); email != nil && acmeIssuer.Email == "" { acmeIssuer.Email = email.(string) @@ -361,15 +403,9 @@ func parseTLS(h Helper) ([]ConfigValue, error) { if caPemFile := h.Option("acme_ca_root"); caPemFile != nil { acmeIssuer.TrustedRootsPEMFiles = append(acmeIssuer.TrustedRootsPEMFiles, caPemFile.(string)) } - configVals = append(configVals, ConfigValue{ Class: "tls.cert_issuer", - Value: acmeIssuer, - }) - } else if internalIssuer != nil { - configVals = append(configVals, ConfigValue{ - Class: "tls.cert_issuer", - Value: internalIssuer, + Value: disambiguateACMEIssuer(acmeIssuer), }) } diff --git a/caddyconfig/httpcaddyfile/options.go b/caddyconfig/httpcaddyfile/options.go index 613bbc6..7d34805 100644 --- a/caddyconfig/httpcaddyfile/options.go +++ b/caddyconfig/httpcaddyfile/options.go @@ -20,6 +20,7 @@ import ( "github.com/caddyserver/caddy/v2" "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" "github.com/caddyserver/caddy/v2/modules/caddytls" + "github.com/caddyserver/certmagic" "github.com/mholt/acmez/acme" ) @@ -35,6 +36,7 @@ func init() { RegisterGlobalOption("acme_ca_root", parseOptSingleString) RegisterGlobalOption("acme_dns", parseOptSingleString) RegisterGlobalOption("acme_eab", parseOptACMEEAB) + RegisterGlobalOption("cert_issuer", parseOptCertIssuer) RegisterGlobalOption("email", parseOptSingleString) RegisterGlobalOption("admin", parseOptAdmin) RegisterGlobalOption("on_demand_tls", parseOptOnDemand) @@ -210,6 +212,33 @@ func parseOptACMEEAB(d *caddyfile.Dispenser) (interface{}, error) { return eab, nil } +func parseOptCertIssuer(d *caddyfile.Dispenser) (interface{}, error) { + if !d.Next() { // consume option name + return nil, d.ArgErr() + } + if !d.Next() { // get issuer module name + return nil, d.ArgErr() + } + modName := d.Val() + mod, err := caddy.GetModule("tls.issuance." + modName) + if err != nil { + return nil, d.Errf("getting issuer module '%s': %v", modName, err) + } + unm, ok := mod.New().(caddyfile.Unmarshaler) + if !ok { + return nil, d.Errf("issuer module '%s' is not a Caddyfile unmarshaler", mod.ID) + } + err = unm.UnmarshalCaddyfile(d.NewFromNextSegment()) + if err != nil { + return nil, err + } + iss, ok := unm.(certmagic.Issuer) + if !ok { + return nil, d.Errf("module %s is not a certmagic.Issuer", mod.ID) + } + return iss, nil +} + func parseOptSingleString(d *caddyfile.Dispenser) (interface{}, error) { d.Next() // consume parameter name if !d.Next() { diff --git a/caddyconfig/httpcaddyfile/tlsapp.go b/caddyconfig/httpcaddyfile/tlsapp.go index db6bf98..a721fee 100644 --- a/caddyconfig/httpcaddyfile/tlsapp.go +++ b/caddyconfig/httpcaddyfile/tlsapp.go @@ -21,6 +21,7 @@ import ( "reflect" "sort" "strconv" + "strings" "github.com/caddyserver/caddy/v2" "github.com/caddyserver/caddy/v2/caddyconfig" @@ -135,8 +136,11 @@ func (st ServerType) buildTLSApp( // issuer, skip, since we intend to adjust only ACME issuers var acmeIssuer *caddytls.ACMEIssuer if ap.Issuer != nil { - var ok bool - if acmeIssuer, ok = ap.Issuer.(*caddytls.ACMEIssuer); !ok { + // ensure we include any issuer that embeds/wraps an underlying ACME issuer + type acmeCapable interface{ GetACMEIssuer() *caddytls.ACMEIssuer } + if acmeWrapper, ok := ap.Issuer.(acmeCapable); ok { + acmeIssuer = acmeWrapper.GetACMEIssuer() + } else { break } } @@ -348,6 +352,8 @@ func (st ServerType) buildTLSApp( // 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) { + issuer, hasIssuer := options["cert_issuer"] + acmeCA, hasACMECA := options["acme_ca"] acmeCARoot, hasACMECARoot := options["acme_ca_root"] acmeDNS, hasACMEDNS := options["acme_dns"] @@ -357,7 +363,7 @@ func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddycon localCerts, hasLocalCerts := options["local_certs"] keyType, hasKeyType := options["key_type"] - hasGlobalAutomationOpts := hasACMECA || hasACMECARoot || hasACMEDNS || hasACMEEAB || hasEmail || hasLocalCerts || hasKeyType + hasGlobalAutomationOpts := hasIssuer || hasACMECA || hasACMECARoot || hasACMEDNS || hasACMEEAB || hasEmail || hasLocalCerts || hasKeyType // if there are no global options related to automation policies // set, then we can just return right away @@ -369,8 +375,16 @@ func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddycon } ap := new(caddytls.AutomationPolicy) + if keyType != nil { + ap.KeyType = keyType.(string) + } - if localCerts != nil { + if hasIssuer { + if hasACMECA || hasACMEDNS || hasACMEEAB || hasEmail || hasLocalCerts { + return nil, fmt.Errorf("global options are ambiguous: cert_issuer is confusing when combined with acme_*, email, or local_certs options") + } + ap.Issuer = issuer.(certmagic.Issuer) + } else if localCerts != nil { // internal issuer enabled trumps any ACME configurations; useful in testing ap.Issuer = new(caddytls.InternalIssuer) // we'll encode it later } else { @@ -402,15 +416,25 @@ func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddycon if acmeEAB != nil { mgr.ExternalAccount = acmeEAB.(*acme.EAB) } - if keyType != nil { - ap.KeyType = keyType.(string) - } - ap.Issuer = mgr // we'll encode it later + ap.Issuer = disambiguateACMEIssuer(mgr) // we'll encode it later } return ap, nil } +// disambiguateACMEIssuer returns an issuer based on the properties of acmeIssuer. +// If acmeIssuer implicitly configures a certain kind of ACMEIssuer (for example, +// ZeroSSL), the proper wrapper over acmeIssuer will be returned instead. +func disambiguateACMEIssuer(acmeIssuer *caddytls.ACMEIssuer) certmagic.Issuer { + // as a special case, we integrate with ZeroSSL's ACME endpoint if it looks like an + // implicit ZeroSSL configuration (this requires a wrapper type over ACMEIssuer + // because of the EAB generation; if EAB is provided, we can use plain ACMEIssuer) + if strings.Contains(acmeIssuer.CA, "acme.zerossl.com") && acmeIssuer.ExternalAccount == nil { + return &caddytls.ZeroSSLIssuer{ACMEIssuer: acmeIssuer} + } + return acmeIssuer +} + // consolidateAutomationPolicies combines automation policies that are the same, // for a cleaner overall output. func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls.AutomationPolicy { -- cgit v1.2.3