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
|
package caddytls
import (
"encoding/json"
"fmt"
"net/url"
"time"
"github.com/go-acme/lego/certcrypto"
"github.com/caddyserver/caddy"
"github.com/go-acme/lego/challenge"
"github.com/mholt/certmagic"
)
func init() {
caddy.RegisterModule(caddy.Module{
Name: "tls.management.acme",
New: func() interface{} { return new(ACMEManagerMaker) },
})
}
// ACMEManagerMaker makes an ACME manager
// for managing certificates using ACME.
// If crafting one manually rather than
// through the config-unmarshal process
// (provisioning), be sure to call
// SetDefaults to ensure sane defaults
// after you have configured this struct
// to your liking.
type ACMEManagerMaker struct {
CA string `json:"ca,omitempty"`
Email string `json:"email,omitempty"`
RenewAhead caddy.Duration `json:"renew_ahead,omitempty"`
KeyType string `json:"key_type,omitempty"`
ACMETimeout caddy.Duration `json:"acme_timeout,omitempty"`
MustStaple bool `json:"must_staple,omitempty"`
Challenges ChallengesConfig `json:"challenges,omitempty"`
OnDemand bool `json:"on_demand,omitempty"`
Storage json.RawMessage `json:"storage,omitempty"`
storage certmagic.Storage
keyType certcrypto.KeyType
}
// newManager is a no-op to satisfy the ManagerMaker interface,
// because this manager type is a special case.
func (m *ACMEManagerMaker) newManager(interactive bool) (certmagic.Manager, error) {
return nil, nil
}
// Provision sets up m.
func (m *ACMEManagerMaker) Provision(ctx caddy.Context) error {
// DNS providers
if m.Challenges.DNS != nil {
val, err := ctx.LoadModuleInline("provider", "tls.dns", m.Challenges.DNSRaw)
if err != nil {
return fmt.Errorf("loading TLS storage module: %s", err)
}
m.Challenges.DNS = val.(challenge.Provider)
m.Challenges.DNSRaw = nil // allow GC to deallocate - TODO: Does this help?
}
// policy-specific storage implementation
if m.Storage != nil {
val, err := ctx.LoadModuleInline("system", "caddy.storage", m.Storage)
if err != nil {
return fmt.Errorf("loading TLS storage module: %s", err)
}
cmStorage, err := val.(caddy.StorageConverter).CertMagicStorage()
if err != nil {
return fmt.Errorf("creating TLS storage configuration: %v", err)
}
m.storage = cmStorage
m.Storage = nil // allow GC to deallocate - TODO: Does this help?
}
m.SetDefaults()
return nil
}
// SetDefaults sets necessary values that are
// currently empty to their default values.
func (m *ACMEManagerMaker) SetDefaults() {
if m.CA == "" {
m.CA = certmagic.LetsEncryptStagingCA // certmagic.Default.CA // TODO: When not testing, switch to production CA
}
if m.Email == "" {
m.Email = certmagic.Default.Email
}
if m.RenewAhead == 0 {
m.RenewAhead = caddy.Duration(certmagic.Default.RenewDurationBefore)
}
if m.keyType == "" {
m.keyType = certmagic.Default.KeyType
}
if m.storage == nil {
m.storage = certmagic.Default.Storage
}
}
// makeCertMagicConfig converts m into a certmagic.Config, because
// this is a special case where the default manager is the certmagic
// Config and not a separate manager.
func (m *ACMEManagerMaker) makeCertMagicConfig(ctx caddy.Context) certmagic.Config {
storage := m.storage
if storage == nil {
storage = ctx.Storage()
}
var ond *certmagic.OnDemandConfig
if m.OnDemand {
var onDemand *OnDemandConfig
appVal, err := ctx.App("tls")
if err == nil {
onDemand = appVal.(*TLS).Automation.OnDemand
}
ond = &certmagic.OnDemandConfig{
DecisionFunc: func(name string) error {
if onDemand != nil {
if onDemand.Ask != "" {
err := onDemandAskRequest(onDemand.Ask, name)
if err != nil {
return err
}
}
// check the rate limiter last, since
// even checking consumes a token; so
// don't even bother checking if the
// other regulations fail anyway
if onDemand.RateLimit != nil {
if !onDemandRateLimiter.Allow() {
return fmt.Errorf("on-demand rate limit exceeded")
}
}
}
return nil
},
}
}
return certmagic.Config{
CA: m.CA,
Email: m.Email,
Agreed: true,
DisableHTTPChallenge: m.Challenges.HTTP.Disabled,
DisableTLSALPNChallenge: m.Challenges.TLSALPN.Disabled,
RenewDurationBefore: time.Duration(m.RenewAhead),
AltHTTPPort: m.Challenges.HTTP.AlternatePort,
AltTLSALPNPort: m.Challenges.TLSALPN.AlternatePort,
DNSProvider: m.Challenges.DNS,
KeyType: supportedCertKeyTypes[m.KeyType],
CertObtainTimeout: time.Duration(m.ACMETimeout),
OnDemand: ond,
MustStaple: m.MustStaple,
Storage: storage,
// TODO: listenHost
}
}
// onDemandAskRequest makes a request to the ask URL
// to see if a certificate can be obtained for name.
// The certificate request should be denied if this
// returns an error.
func onDemandAskRequest(ask string, name string) error {
askURL, err := url.Parse(ask)
if err != nil {
return fmt.Errorf("parsing ask URL: %v", err)
}
qs := askURL.Query()
qs.Set("domain", name)
askURL.RawQuery = qs.Encode()
resp, err := onDemandAskClient.Get(askURL.String())
if err != nil {
return fmt.Errorf("error checking %v to deterine if certificate for hostname '%s' should be allowed: %v",
ask, name, err)
}
resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return fmt.Errorf("certificate for hostname '%s' not allowed; non-2xx status code %d returned from %v",
name, resp.StatusCode, ask)
}
return nil
}
// supportedCertKeyTypes is all the key types that are supported
// for certificates that are obtained through ACME.
var supportedCertKeyTypes = map[string]certcrypto.KeyType{
"RSA2048": certcrypto.RSA2048,
"RSA4096": certcrypto.RSA4096,
"P256": certcrypto.EC256,
"P384": certcrypto.EC384,
}
// Interface guard
var _ managerMaker = (*ACMEManagerMaker)(nil)
|
