-
Notifications
You must be signed in to change notification settings - Fork 0
/
identity.go
254 lines (228 loc) · 6.95 KB
/
identity.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 2016 Gravitational, 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 client
import (
"bufio"
"bytes"
"io"
"io/ioutil"
"os"
"github.com/gravitational/teleport/lib/auth/native"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/sshutils"
"github.com/gravitational/trace"
)
// NewKey generates a new unsigned key. Such key must be signed by a
// Teleport CA (auth server) before it becomes useful.
func NewKey() (key *Key, err error) {
priv, pub, err := native.GenerateKeyPair("")
if err != nil {
return nil, trace.Wrap(err)
}
return &Key{
Priv: priv,
Pub: pub,
}, nil
}
// IdentityFileFormat describes possible file formats how a user identity can be sotred
type IdentityFileFormat string
const (
// IdentityFormatFile is when a key + cert are stored concatenated into a single file
IdentityFormatFile IdentityFileFormat = "file"
// IdentityFormatOpenSSH is OpenSSH-compatible format, when a key and a cert are stored in
// two different files (in the same directory)
IdentityFormatOpenSSH IdentityFileFormat = "openssh"
// IdentityFormatTLS is a standard TLS format used by common TLS clients (e.g. GRPC) where
// certificate and key are stored in separate files.
IdentityFormatTLS IdentityFileFormat = "tls"
// DefaultIdentityFormat is what Teleport uses by default
DefaultIdentityFormat = IdentityFormatFile
)
// MakeIdentityFile takes a username + their credentials and saves them to disk
// in a specified format
func MakeIdentityFile(filePath string, key *Key, format IdentityFileFormat, certAuthorities []services.CertAuthority) (err error) {
const (
// the files and the dir will be created with these permissions:
fileMode = 0600
dirMode = 0700
)
if filePath == "" {
return trace.BadParameter("identity location is not specified")
}
var output io.Writer = os.Stdout
switch format {
// dump user identity into a single file:
case IdentityFormatFile:
f, err := os.OpenFile(filePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, fileMode)
if err != nil {
return trace.Wrap(err)
}
output = f
defer f.Close()
// write key:
if _, err = output.Write(key.Priv); err != nil {
return trace.Wrap(err)
}
// append ssh cert:
if _, err = output.Write(key.Cert); err != nil {
return trace.Wrap(err)
}
// append tls cert:
if _, err = output.Write(key.TLSCert); err != nil {
return trace.Wrap(err)
}
// append trusted host certificate authorities
for _, ca := range certAuthorities {
// append ssh ca certificates
for _, publicKey := range ca.GetCheckingKeys() {
data, err := sshutils.MarshalAuthorizedHostsFormat(ca.GetClusterName(), publicKey, nil)
if err != nil {
return trace.Wrap(err)
}
if _, err = output.Write([]byte(data)); err != nil {
return trace.Wrap(err)
}
if _, err = output.Write([]byte("\n")); err != nil {
return trace.Wrap(err)
}
}
// append tls ca certificates
for _, keyPair := range ca.GetTLSKeyPairs() {
if _, err = output.Write(keyPair.Cert); err != nil {
return trace.Wrap(err)
}
}
}
// dump user identity into separate files:
case IdentityFormatOpenSSH:
keyPath := filePath
certPath := keyPath + "-cert.pub"
err = ioutil.WriteFile(certPath, key.Cert, fileMode)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(keyPath, key.Priv, fileMode)
if err != nil {
return trace.Wrap(err)
}
case IdentityFormatTLS:
keyPath := filePath + ".key"
certPath := filePath + ".crt"
casPath := filePath + ".cas"
err = ioutil.WriteFile(certPath, key.TLSCert, fileMode)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(keyPath, key.Priv, fileMode)
if err != nil {
return trace.Wrap(err)
}
var caCerts []byte
for _, ca := range certAuthorities {
for _, keyPair := range ca.GetTLSKeyPairs() {
caCerts = append(caCerts, keyPair.Cert...)
}
}
err = ioutil.WriteFile(casPath, caCerts, fileMode)
if err != nil {
return trace.Wrap(err)
}
default:
return trace.BadParameter("unsupported identity format: %q, use one of %q, %q, or %q",
format, IdentityFormatFile, IdentityFormatOpenSSH, IdentityFormatTLS)
}
return nil
}
// IdentityFile represents the basic components of an identity file.
type IdentityFile struct {
PrivateKey []byte
Certs struct {
SSH []byte
TLS []byte
}
CACerts struct {
SSH [][]byte
TLS [][]byte
}
}
// DecodeIdentityFile attempts to break up the contents of an identity file
// into its respective components.
func DecodeIdentityFile(r io.Reader) (*IdentityFile, error) {
scanner := bufio.NewScanner(r)
var ident IdentityFile
// Subslice of scanner's buffer pointing to current line
// with leading and trailing whitespace trimmed.
var line []byte
// Attempt to scan to the next line.
scanln := func() bool {
if !scanner.Scan() {
line = nil
return false
}
line = bytes.TrimSpace(scanner.Bytes())
return true
}
// Check if the current line starts with prefix `p`.
peekln := func(p string) bool {
return bytes.HasPrefix(line, []byte(p))
}
// Get an "owned" copy of the current line.
cloneln := func() []byte {
ln := make([]byte, len(line))
copy(ln, line)
return ln
}
// Scan through all lines of identity file. Lines with a known prefix
// are copied out of the scanner's buffer. All others are ignored.
for scanln() {
switch {
case peekln("ssh"):
ident.Certs.SSH = cloneln()
case peekln("@cert-authority"):
ident.CACerts.SSH = append(ident.CACerts.SSH, cloneln())
case peekln("-----BEGIN"):
// Current line marks the beginning of a PEM block. Consume all
// lines until a corresponding END is found.
var pemBlock []byte
for {
pemBlock = append(pemBlock, line...)
pemBlock = append(pemBlock, '\n')
if peekln("-----END") {
break
}
if !scanln() {
// If scanner has terminated in the middle of a PEM block, either
// the reader encountered an error, or the PEM block is a fragment.
if err := scanner.Err(); err != nil {
return nil, trace.Wrap(err)
}
return nil, trace.BadParameter("invalid PEM block (fragment)")
}
}
// Decide where to place the pem block based on
// which pem blocks have already been found.
switch {
case ident.PrivateKey == nil:
ident.PrivateKey = pemBlock
case ident.Certs.TLS == nil:
ident.Certs.TLS = pemBlock
default:
ident.CACerts.TLS = append(ident.CACerts.TLS, pemBlock)
}
}
}
if err := scanner.Err(); err != nil {
return nil, trace.Wrap(err)
}
return &ident, nil
}