-
Notifications
You must be signed in to change notification settings - Fork 64
/
crypto.go
254 lines (215 loc) · 7.99 KB
/
crypto.go
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
/*
* Copyright 2023 Venafi, Inc.
*
* 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 installer
import (
"crypto"
"crypto/sha1"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"fmt"
"os"
"strconv"
"strings"
"time"
"go.uber.org/zap"
"github.com/Venafi/vcert/v5/pkg/certificate"
"github.com/Venafi/vcert/v5/pkg/playbook/app/vcertutil"
"github.com/Venafi/vcert/v5/pkg/util"
)
// DayDuration represents a day (24 hours) in the Duration type
const DayDuration = time.Hour * 24
type Certificate struct {
X509cert x509.Certificate
Thumbprint string
}
func getPrivateKey(privateKeyStr string, keyPassword string) (interface{}, error) {
//Getting Private Key
pkBlock, _ := pem.Decode([]byte(privateKeyStr))
if pkBlock == nil {
return nil, fmt.Errorf("missing Private Key PEM")
}
var err error
//Decrypting Private Key
pkDER := pkBlock.Bytes
if util.X509IsEncryptedPEMBlock(pkBlock) {
pkDER, err = util.X509DecryptPEMBlock(pkBlock, []byte(keyPassword))
if err != nil {
return nil, fmt.Errorf("private key decryption error: %w", err)
}
}
//Unmarshalling the Private Key
var privateKey interface{}
switch pkBlock.Type {
case "EC PRIVATE KEY":
privateKey, err = x509.ParseECPrivateKey(pkDER)
if err != nil {
privateKey, err = x509.ParsePKCS8PrivateKey(pkDER)
}
case "RSA PRIVATE KEY":
privateKey, err = x509.ParsePKCS1PrivateKey(pkDER)
if err != nil {
privateKey, err = x509.ParsePKCS8PrivateKey(pkDER)
}
default:
return nil, fmt.Errorf("unexpected Private Key type: %s", pkBlock.Type)
}
if err != nil {
return nil, fmt.Errorf("private key error: %w", err)
}
return privateKey, nil
}
func prepareCertificateForBundle(request certificate.Request, pcc certificate.PEMCollection, decryptPK bool) (*certificate.PEMCollection, error) {
// Private key generated locally. Need to add it to the PEM Collection
if request.CsrOrigin == certificate.LocalGeneratedCSR {
err := pcc.AddPrivateKey(request.PrivateKey, []byte(request.KeyPassword), "")
if err != nil {
return nil, err
}
zap.L().Debug("CSR Origin is [local]. Private Key added to PEM Collection")
}
// Key needs to be decrypted in order to create the bundle (PKCS12, JKS)
// Firefly does not encrypt Private Keys. Thus, Private Key should not be decrypted in that scenario
if pcc.PrivateKey != "" && decryptPK {
privateKey, err := vcertutil.DecryptPrivateKey(pcc.PrivateKey, request.KeyPassword)
if err != nil {
// there's chance we've got a private key that is not PKCS8
zap.L().Debug("PKCS8 decrypt failed for opening Private Key. Trying legacy decrypt")
privKey, err := getPrivateKey(pcc.PrivateKey, request.KeyPassword)
if err != nil {
return nil, err
}
var privKeyBlock *pem.Block
privKeyD := privKey.(crypto.Signer)
privKeyBlock, err = certificate.GetPrivateKeyPEMBock(privKeyD, util.LegacyPem)
if err != nil {
return nil, err
}
privEncodedPEM := pem.EncodeToMemory(privKeyBlock)
privKeyPEMString := string(privEncodedPEM)
pcc.PrivateKey = privKeyPEMString
privateKey = privKeyPEMString
}
pcc.PrivateKey = privateKey
zap.L().Debug("successfully decrypted Private Key")
}
return &pcc, nil
}
func loadPEMCertificate(certFile string) (*x509.Certificate, error) {
certData, err := os.ReadFile(certFile)
if err != nil {
return nil, err
}
return parsePEMCertificate(certData)
}
func parsePEMCertificate(certData []byte) (*x509.Certificate, error) {
p, _ := pem.Decode(certData)
if p == nil {
return nil, fmt.Errorf("could not decode PEM data")
}
if p.Type != "CERTIFICATE" {
return nil, fmt.Errorf("certificate data does not contain a certificate")
}
cert, err := x509.ParseCertificate(p.Bytes)
if err != nil {
return nil, fmt.Errorf("could not parse certificate to X509 object: %w", err)
}
return cert, nil
}
func needRenewal(cert *x509.Certificate, renewBefore string) bool {
// if duration is 0 anything, then return false, auto-renewal is disabled
if renewBefore == "0" || strings.ToLower(renewBefore) == "disabled" {
zap.L().Warn("certificate expiring soon but automatic renewal disabled",
zap.String("certificate", cert.Subject.CommonName),
zap.String("expirationDate", cert.NotAfter.String()))
return false
}
timePostfix := renewBefore[len(renewBefore)-1:]
renew := renewBefore[:len(renewBefore)-1]
renewValue, err := strconv.ParseInt(renew, 10, 32)
if err != nil {
zap.L().Error("could not parse renewBefore value. Using default value [10%] instead",
zap.String("renewBefore", renewBefore), zap.Error(err))
// TODO: use real global default duration
timePostfix = "%"
renewValue = 10
}
// if duration is 0 anything, then return false, auto-renewal is disabled
if renewValue == 0 {
zap.L().Warn("certificate expiring soon but automatic renewal disabled",
zap.String("certificate", cert.Subject.CommonName),
zap.String("expirationDate", cert.NotAfter.String()))
return false
}
// Cert expired, renew
if cert.NotAfter.Before(time.Now()) {
zap.L().Debug("certificate is expired", zap.String("certificate", cert.Subject.CommonName))
return true
}
var timeToRenew time.Time
switch timePostfix {
case "d":
// operation happens in integers to avoid issues with linter and time.Duration struct
ns := DayDuration.Nanoseconds()
renewDuration := time.Duration(ns * renewValue)
timeToRenew = cert.NotAfter.Add(-renewDuration)
case "h":
ns := time.Hour.Nanoseconds()
renewDuration := time.Duration(ns * renewValue)
timeToRenew = cert.NotAfter.Add(-renewDuration)
case "%":
// Total # of ns in the whole certificate lifetime
nsCertValidity := cert.NotAfter.Sub(cert.NotBefore).Nanoseconds()
// if 10%, then renew when 90% of the validity time has elapsed
pct := float64(renewValue) / 100
renewDuration := time.Duration(float64(nsCertValidity) * pct)
timeToRenew = cert.NotAfter.Add(-renewDuration)
default:
zap.L().Warn("unknown duration postfix. Valid postfixes are: d (Days) and h (Hours): Using default [10%]",
zap.String("postfix", timePostfix))
// Total # of ns in the whole certificate lifetime
nsCertValidity := cert.NotAfter.Sub(cert.NotBefore).Nanoseconds()
// TODO: Respect global DefaultRenewal
renewDuration := time.Duration(float64(nsCertValidity) * float64(0.10))
timeToRenew = cert.NotAfter.Add(-renewDuration)
}
// Check certificate renew window
//Time now + renew window is bigger than cert expiration day? Then renew
if time.Now().After(timeToRenew) {
zap.L().Debug("certificate in renew window", zap.String("certificate", cert.Subject.CommonName))
return true
}
zap.L().Info(fmt.Sprintf("cert expires on %s and will auto-renew on %s", cert.NotAfter, timeToRenew),
zap.String("expirationDate", cert.NotAfter.String()), zap.String("renewDate", timeToRenew.String()))
return false
}
// CreateX509Cert takes a PEMCollection and creates an x509.Certificate object from it
// Could also add the x509.Certificate object directly to the PEM collection in the original constructor
func CreateX509Cert(pcc *certificate.PEMCollection, certReq *certificate.Request, decryptPK bool) (*Certificate, *certificate.PEMCollection, error) {
preparedPcc, err := prepareCertificateForBundle(*certReq, *pcc, decryptPK)
if err != nil {
return nil, nil, fmt.Errorf("could not prepare certificate and key: %w", err)
}
certBytes := []byte(pcc.Certificate)
x509Cert, err := parsePEMCertificate(certBytes)
if err != nil {
return nil, preparedPcc, err
}
thumbprint := sha1.Sum(x509Cert.Raw)
hexThumbprint := hex.EncodeToString(thumbprint[:])
cert := Certificate{*x509Cert, hexThumbprint}
return &cert, preparedPcc, nil
}