-
Notifications
You must be signed in to change notification settings - Fork 413
/
authority.go
263 lines (243 loc) · 7.7 KB
/
authority.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
255
256
257
258
259
260
261
262
263
package authority
import (
"context"
"crypto"
"crypto/sha256"
"crypto/x509"
"encoding/hex"
"sync"
"time"
"github.com/pkg/errors"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/db"
"github.com/smallstep/certificates/sshutil"
"github.com/smallstep/certificates/templates"
"github.com/smallstep/cli/crypto/pemutil"
"github.com/smallstep/cli/crypto/x509util"
"golang.org/x/crypto/ssh"
)
const (
legacyAuthority = "step-certificate-authority"
)
// Authority implements the Certificate Authority internal interface.
type Authority struct {
config *Config
rootX509Certs []*x509.Certificate
intermediateIdentity *x509util.Identity
sshCAUserCertSignKey ssh.Signer
sshCAHostCertSignKey ssh.Signer
sshCAUserCerts []ssh.PublicKey
sshCAHostCerts []ssh.PublicKey
sshCAUserFederatedCerts []ssh.PublicKey
sshCAHostFederatedCerts []ssh.PublicKey
certificates *sync.Map
startTime time.Time
provisioners *provisioner.Collection
db db.AuthDB
// Do not re-initialize
initOnce bool
// Custom functions
sshBastionFunc func(user, hostname string) (*Bastion, error)
sshCheckHostFunc func(ctx context.Context, principal string, tok string, roots []*x509.Certificate) (bool, error)
sshGetHostsFunc func(cert *x509.Certificate) ([]sshutil.Host, error)
getIdentityFunc provisioner.GetIdentityFunc
}
// New creates and initiates a new Authority type.
func New(config *Config, opts ...Option) (*Authority, error) {
err := config.Validate()
if err != nil {
return nil, err
}
var a = &Authority{
config: config,
certificates: new(sync.Map),
provisioners: provisioner.NewCollection(config.getAudiences()),
}
for _, opt := range opts {
opt(a)
}
if err := a.init(); err != nil {
return nil, err
}
return a, nil
}
// init performs validation and initializes the fields of an Authority struct.
func (a *Authority) init() error {
// Check if handler has already been validated/initialized.
if a.initOnce {
return nil
}
var err error
// Initialize step-ca Database if it's not already initialized with WithDB.
// If a.config.DB is nil then a simple, barebones in memory DB will be used.
if a.db == nil {
if a.db, err = db.New(a.config.DB); err != nil {
return err
}
}
// Load the root certificates and add them to the certificate store
a.rootX509Certs = make([]*x509.Certificate, len(a.config.Root))
for i, path := range a.config.Root {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
// Add root certificate to the certificate map
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
a.rootX509Certs[i] = crt
}
// Add federated roots
for _, path := range a.config.FederatedRoots {
crt, err := pemutil.ReadCertificate(path)
if err != nil {
return err
}
sum := sha256.Sum256(crt.Raw)
a.certificates.Store(hex.EncodeToString(sum[:]), crt)
}
// Decrypt and load intermediate public / private key pair.
if len(a.config.Password) > 0 {
a.intermediateIdentity, err = x509util.LoadIdentityFromDisk(
a.config.IntermediateCert,
a.config.IntermediateKey,
pemutil.WithPassword([]byte(a.config.Password)),
)
if err != nil {
return err
}
} else {
a.intermediateIdentity, err = x509util.LoadIdentityFromDisk(a.config.IntermediateCert, a.config.IntermediateKey)
if err != nil {
return err
}
}
// Decrypt and load SSH keys
if a.config.SSH != nil {
if a.config.SSH.HostKey != "" {
signer, err := parseCryptoSigner(a.config.SSH.HostKey, a.config.Password)
if err != nil {
return err
}
a.sshCAHostCertSignKey, err = ssh.NewSignerFromSigner(signer)
if err != nil {
return errors.Wrap(err, "error creating ssh signer")
}
// Append public key to list of host certs
a.sshCAHostCerts = append(a.sshCAHostCerts, a.sshCAHostCertSignKey.PublicKey())
a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, a.sshCAHostCertSignKey.PublicKey())
}
if a.config.SSH.UserKey != "" {
signer, err := parseCryptoSigner(a.config.SSH.UserKey, a.config.Password)
if err != nil {
return err
}
a.sshCAUserCertSignKey, err = ssh.NewSignerFromSigner(signer)
if err != nil {
return errors.Wrap(err, "error creating ssh signer")
}
// Append public key to list of user certs
a.sshCAUserCerts = append(a.sshCAUserCerts, a.sshCAUserCertSignKey.PublicKey())
a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, a.sshCAUserCertSignKey.PublicKey())
}
// Append other public keys
for _, key := range a.config.SSH.Keys {
switch key.Type {
case provisioner.SSHHostCert:
if key.Federated {
a.sshCAHostFederatedCerts = append(a.sshCAHostFederatedCerts, key.PublicKey())
} else {
a.sshCAHostCerts = append(a.sshCAHostCerts, key.PublicKey())
}
case provisioner.SSHUserCert:
if key.Federated {
a.sshCAUserFederatedCerts = append(a.sshCAUserFederatedCerts, key.PublicKey())
} else {
a.sshCAUserCerts = append(a.sshCAUserCerts, key.PublicKey())
}
default:
return errors.Errorf("unsupported type %s", key.Type)
}
}
}
// Merge global and configuration claims
claimer, err := provisioner.NewClaimer(a.config.AuthorityConfig.Claims, globalProvisionerClaims)
if err != nil {
return err
}
// TODO: should we also be combining the ssh federated roots here?
// If we rotate ssh roots keys, sshpop provisioner will lose ability to
// validate old SSH certificates, unless they are added as federated certs.
sshKeys, err := a.GetSSHRoots()
if err != nil {
return err
}
// Initialize provisioners
config := provisioner.Config{
Claims: claimer.Claims(),
Audiences: a.config.getAudiences(),
DB: a.db,
SSHKeys: &provisioner.SSHKeys{
UserKeys: sshKeys.UserKeys,
HostKeys: sshKeys.HostKeys,
},
GetIdentityFunc: a.getIdentityFunc,
}
// Store all the provisioners
for _, p := range a.config.AuthorityConfig.Provisioners {
if err := p.Init(config); err != nil {
return err
}
if err := a.provisioners.Store(p); err != nil {
return err
}
}
// Configure protected template variables:
if t := a.config.Templates; t != nil {
if t.Data == nil {
t.Data = make(map[string]interface{})
}
var vars templates.Step
if a.config.SSH != nil {
if a.sshCAHostCertSignKey != nil {
vars.SSH.HostKey = a.sshCAHostCertSignKey.PublicKey()
vars.SSH.HostFederatedKeys = append(vars.SSH.HostFederatedKeys, a.sshCAHostFederatedCerts[1:]...)
}
if a.sshCAUserCertSignKey != nil {
vars.SSH.UserKey = a.sshCAUserCertSignKey.PublicKey()
vars.SSH.UserFederatedKeys = append(vars.SSH.UserFederatedKeys, a.sshCAUserFederatedCerts[1:]...)
}
}
t.Data["Step"] = vars
}
// JWT numeric dates are seconds.
a.startTime = time.Now().Truncate(time.Second)
// Set flag indicating that initialization has been completed, and should
// not be repeated.
a.initOnce = true
return nil
}
// GetDatabase returns the authority database. If the configuration does not
// define a database, GetDatabase will return a db.SimpleDB instance.
func (a *Authority) GetDatabase() db.AuthDB {
return a.db
}
// Shutdown safely shuts down any clients, databases, etc. held by the Authority.
func (a *Authority) Shutdown() error {
return a.db.Shutdown()
}
func parseCryptoSigner(filename, password string) (crypto.Signer, error) {
var opts []pemutil.Options
if password != "" {
opts = append(opts, pemutil.WithPassword([]byte(password)))
}
key, err := pemutil.Read(filename, opts...)
if err != nil {
return nil, err
}
signer, ok := key.(crypto.Signer)
if !ok {
return nil, errors.Errorf("key %s of type %T cannot be used for signing operations", filename, key)
}
return signer, nil
}