summaryrefslogtreecommitdiff
path: root/caddyconfig/httpcaddyfile/tlsapp.go
blob: 8f642915eb0076cd10af3645f45b23775b7bfd04 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package httpcaddyfile

import (
	"bytes"
	"encoding/json"
	"fmt"
	"reflect"
	"sort"
	"strconv"

	"github.com/caddyserver/caddy/v2"
	"github.com/caddyserver/caddy/v2/caddyconfig"
	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
	"github.com/caddyserver/caddy/v2/modules/caddytls"
	"github.com/caddyserver/certmagic"
)

func (st ServerType) buildTLSApp(
	pairings []sbAddrAssociation,
	options map[string]interface{},
	warnings []caddyconfig.Warning,
) (*caddytls.TLS, []caddyconfig.Warning, error) {

	tlsApp := &caddytls.TLS{CertificatesRaw: make(caddy.ModuleMap)}
	var certLoaders []caddytls.CertificateLoader

	httpsPort := strconv.Itoa(caddyhttp.DefaultHTTPSPort)
	if hsp, ok := options["https_port"].(int); ok {
		httpsPort = strconv.Itoa(hsp)
	}

	// count how many server blocks have a TLS-enabled key with
	// no host, and find all hosts that share a server block with
	// a hostless key, so that they don't get forgotten/omitted
	// by auto-HTTPS (since they won't appear in route matchers)
	var serverBlocksWithTLSHostlessKey int
	hostsSharedWithHostlessKey := make(map[string]struct{})
	for _, pair := range pairings {
		for _, sb := range pair.serverBlocks {
			for _, addr := range sb.keys {
				if addr.Host == "" {
					// this address has no hostname, but if it's explicitly set
					// to HTTPS, then we need to count it as being TLS-enabled
					if addr.Scheme == "https" || addr.Port == httpsPort {
						serverBlocksWithTLSHostlessKey++
					}
					// this server block has a hostless key, now
					// go through and add all the hosts to the set
					for _, otherAddr := range sb.keys {
						if otherAddr.Original == addr.Original {
							continue
						}
						if otherAddr.Host != "" {
							hostsSharedWithHostlessKey[otherAddr.Host] = struct{}{}
						}
					}
					break
				}
			}
		}
	}

	catchAllAP, err := newBaseAutomationPolicy(options, warnings, false)
	if err != nil {
		return nil, warnings, err
	}

	for _, p := range pairings {
		for _, sblock := range p.serverBlocks {
			// get values that populate an automation policy for this block
			var ap *caddytls.AutomationPolicy

			sblockHosts := sblock.hostsFromKeys(false)
			if len(sblockHosts) == 0 {
				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
			}

			// certificate issuers
			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)
					}
					ap.Issuer = issuer
				}
			}

			// 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
				if ap.Issuer != nil {
					var ok bool
					if acmeIssuer, ok = ap.Issuer.(*caddytls.ACMEIssuer); !ok {
						break
					}
				}

				// proceed to configure the ACME issuer's bind host, without
				// overwriting any existing settings
				if acmeIssuer == nil {
					acmeIssuer = new(caddytls.ACMEIssuer)
				}
				if acmeIssuer.Challenges == nil {
					acmeIssuer.Challenges = new(caddytls.ChallengesConfig)
				}
				if acmeIssuer.Challenges.BindHost == "" {
					// only binding to one host is supported
					var bindHost string
					if bindHosts, ok := cfgVal.Value.([]string); ok && len(bindHosts) > 0 {
						bindHost = bindHosts[0]
					}
					acmeIssuer.Challenges.BindHost = bindHost
				}
				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")
					}
					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.SubjectQualifiesForPublicCert(s) {
								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
			if clVals, ok := sblock.pile["tls.cert_loader"]; ok {
				for _, clVal := range clVals {
					certLoaders = append(certLoaders, clVal.Value.(caddytls.CertificateLoader))
				}
			}
		}
	}

	// group certificate loaders by module name, then add to config
	if len(certLoaders) > 0 {
		loadersByName := make(map[string]caddytls.CertificateLoader)
		for _, cl := range certLoaders {
			name := caddy.GetModuleName(cl)
			// ugh... technically, we may have multiple FileLoader and FolderLoader
			// modules (because the tls directive returns one per occurrence), but
			// the config structure expects only one instance of each kind of loader
			// module, so we have to combine them... instead of enumerating each
			// possible cert loader module in a type switch, we can use reflection,
			// which works on any cert loaders that are slice types
			if reflect.TypeOf(cl).Kind() == reflect.Slice {
				combined := reflect.ValueOf(loadersByName[name])
				if !combined.IsValid() {
					combined = reflect.New(reflect.TypeOf(cl)).Elem()
				}
				clVal := reflect.ValueOf(cl)
				for i := 0; i < clVal.Len(); i++ {
					combined = reflect.Append(combined, clVal.Index(i))
				}
				loadersByName[name] = combined.Interface().(caddytls.CertificateLoader)
			}
		}
		for certLoaderName, loaders := range loadersByName {
			tlsApp.CertificatesRaw[certLoaderName] = caddyconfig.JSON(loaders, &warnings)
		}
	}

	// set any of the on-demand options, for if/when on-demand TLS is enabled
	if onDemand, ok := options["on_demand_tls"].(*caddytls.OnDemandConfig); ok {
		if tlsApp.Automation == nil {
			tlsApp.Automation = new(caddytls.AutomationConfig)
		}
		tlsApp.Automation.OnDemand = onDemand
	}

	// if any hostnames appear on the same server block as a key with
	// no host, they will not be used with route matchers because the
	// hostless key matches all hosts, therefore, it wouldn't be
	// considered for auto-HTTPS, so we need to make sure those hosts
	// are manually considered for managed certificates; we also need
	// to make sure that any of these names which are internal-only
	// get internal certificates by default rather than ACME
	var al caddytls.AutomateLoader
	internalAP := &caddytls.AutomationPolicy{
		IssuerRaw: json.RawMessage(`{"module":"internal"}`),
	}
	for h := range hostsSharedWithHostlessKey {
		al = append(al, h)
		if !certmagic.SubjectQualifiesForPublicCert(h) {
			internalAP.Subjects = append(internalAP.Subjects, h)
		}
	}
	if len(al) > 0 {
		tlsApp.CertificatesRaw["automate"] = caddyconfig.JSON(al, &warnings)
	}
	if len(internalAP.Subjects) > 0 {
		if tlsApp.Automation == nil {
			tlsApp.Automation = new(caddytls.AutomationConfig)
		}
		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)
		}
		tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP)
	}

	// do a little verification & cleanup
	if tlsApp.Automation != nil {
		// ensure automation policies don't overlap subjects (this should be
		// an error at provision-time as well, but catch it in the adapt phase
		// for convenience)
		automationHostSet := make(map[string]struct{})
		for _, ap := range tlsApp.Automation.Policies {
			for _, s := range ap.Subjects {
				if _, ok := automationHostSet[s]; ok {
					return nil, warnings, fmt.Errorf("hostname appears in more than one automation policy, making certificate management ambiguous: %s", s)
				}
				automationHostSet[s] = struct{}{}
			}
		}

		// consolidate automation policies that are the exact same
		tlsApp.Automation.Policies = consolidateAutomationPolicies(tlsApp.Automation.Policies)
	}

	return tlsApp, warnings, nil
}

// newBaseAutomationPolicy returns a new TLS automation policy that gets
// its values from the global options map. It should be used as the base
// for any other automation policies. A nil policy (and no error) will be
// 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) {
	acmeCA, hasACMECA := options["acme_ca"]
	acmeCARoot, hasACMECARoot := options["acme_ca_root"]
	acmeDNS, hasACMEDNS := options["acme_dns"]
	acmeEAB, hasACMEEAB := options["acme_eab"]

	email, hasEmail := options["email"]
	localCerts, hasLocalCerts := options["local_certs"]
	keyType, hasKeyType := options["key_type"]

	hasGlobalAutomationOpts := 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
	if !hasGlobalAutomationOpts {
		if always {
			return new(caddytls.AutomationPolicy), nil
		}
		return nil, nil
	}

	ap := new(caddytls.AutomationPolicy)

	if localCerts != nil {
		// internal issuer enabled trumps any ACME configurations; useful in testing
		ap.Issuer = new(caddytls.InternalIssuer) // we'll encode it later
	} else {
		if acmeCA == nil {
			acmeCA = ""
		}
		if email == nil {
			email = ""
		}
		mgr := &caddytls.ACMEIssuer{
			CA:    acmeCA.(string),
			Email: email.(string),
		}
		if acmeDNS != nil {
			provName := acmeDNS.(string)
			dnsProvModule, err := caddy.GetModule("dns.providers." + provName)
			if err != nil {
				return nil, fmt.Errorf("getting DNS provider module named '%s': %v", provName, err)
			}
			mgr.Challenges = &caddytls.ChallengesConfig{
				DNS: &caddytls.DNSChallengeConfig{
					ProviderRaw: caddyconfig.JSONModuleObject(dnsProvModule.New(), "name", provName, &warnings),
				},
			}
		}
		if acmeCARoot != nil {
			mgr.TrustedRootsPEMFiles = []string{acmeCARoot.(string)}
		}
		if acmeEAB != nil {
			mgr.ExternalAccount = acmeEAB.(*caddytls.ExternalAccountBinding)
		}
		if keyType != nil {
			ap.KeyType = keyType.(string)
		}
		ap.Issuer = mgr // we'll encode it later
	}

	return ap, nil
}

// consolidateAutomationPolicies combines automation policies that are the same,
// for a cleaner overall output.
func consolidateAutomationPolicies(aps []*caddytls.AutomationPolicy) []*caddytls.AutomationPolicy {
	for i := 0; i < len(aps); i++ {
		for j := 0; j < len(aps); j++ {
			if j == i {
				continue
			}

			// 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:]...)
				i--
				break
			}

			// if the policy is the same, we can keep just one, but we have
			// to be careful which one we keep; if only one has any hostnames
			// defined, then we need to keep the one without any hostnames,
			// otherwise the one without any subjects (a catch-all) would be
			// eaten up by the one with subjects; and if both have subjects, we
			// need to combine their lists
			if bytes.Equal(aps[i].IssuerRaw, aps[j].IssuerRaw) &&
				bytes.Equal(aps[i].StorageRaw, aps[j].StorageRaw) &&
				aps[i].MustStaple == aps[j].MustStaple &&
				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:]...)
				} else {
					aps[i].Subjects = append(aps[i].Subjects, aps[j].Subjects...)
					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
}