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
|
package client
import (
"fmt"
"os"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/dlog"
"github.com/mimecast/dtail/internal/ssh"
gossh "golang.org/x/crypto/ssh"
)
var (
privateKeySigner = ssh.PrivateKeySigner
agentSigners = ssh.AgentSignersWithKeyIndex
)
// InitSSHAuthMethods initialises all known SSH auth methods on the client side.
func InitSSHAuthMethods(sshAuthMethods []gossh.AuthMethod,
hostKeyCallback gossh.HostKeyCallback, trustAllHosts bool, throttleCh chan struct{},
privateKeyPath string, agentKeyIndex int) ([]gossh.AuthMethod, HostKeyCallback) {
if len(sshAuthMethods) > 0 {
simpleCallback, err := NewSimpleCallback()
if err != nil {
dlog.Client.FatalPanic(err)
}
return sshAuthMethods, simpleCallback
}
return initKnownHostsAuthMethods(trustAllHosts, throttleCh, privateKeyPath, agentKeyIndex)
}
func initKnownHostsAuthMethods(trustAllHosts bool, throttleCh chan struct{},
privateKeyPath string, agentKeyIndex int) ([]gossh.AuthMethod, HostKeyCallback) {
knownHostsFile := fmt.Sprintf("%s/.ssh/known_hosts", os.Getenv("HOME"))
if config.Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
// In case of integration test, override known hosts file path.
knownHostsFile = "./known_hosts"
}
knownHostsCallback, err := NewKnownHostsCallback(knownHostsFile, trustAllHosts, throttleCh)
if err != nil {
dlog.Client.FatalPanic(knownHostsFile, err)
}
dlog.Client.Debug("initKnownHostsAuthMethods", "Added known hosts file path", knownHostsFile)
if config.Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
if privateKeyPath == "" {
privateKeyPath = "./id_rsa"
}
GeneratePrivatePublicKeyPairIfNotExists(privateKeyPath, 4096)
}
sshAuthMethods := collectKnownHostsAuthMethods(privateKeyPath, agentKeyIndex)
if len(sshAuthMethods) == 0 {
dlog.Client.FatalPanic("Unable to find private SSH key information")
}
return sshAuthMethods, knownHostsCallback
}
func collectKnownHostsAuthMethods(privateKeyPath string, agentKeyIndex int) []gossh.AuthMethod {
signers := collectKnownHostsSigners(privateKeyPath, agentKeyIndex)
if len(signers) == 0 {
return nil
}
return []gossh.AuthMethod{gossh.PublicKeys(signers...)}
}
func collectKnownHostsSigners(privateKeyPath string, agentKeyIndex int) []gossh.Signer {
var signers []gossh.Signer
home := os.Getenv("HOME")
defaultPrivateKeyPaths := []string{
home + "/.ssh/id_rsa",
home + "/.ssh/id_dsa",
home + "/.ssh/id_ecdsa",
home + "/.ssh/id_ed25519",
}
if config.Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
defaultPrivateKeyPaths = append([]string{"./id_rsa"}, defaultPrivateKeyPaths...)
}
if privateKeyPath == "" {
privateKeyPath = defaultPrivateKeyPaths[0]
}
addedPrivateKeyPaths := make(map[string]bool, len(defaultPrivateKeyPaths)+1)
addedPublicKeys := make(map[string]bool, len(defaultPrivateKeyPaths)+1)
addSigner := func(source string, signer gossh.Signer) {
if signer == nil {
return
}
pubKey := string(signer.PublicKey().Marshal())
if addedPublicKeys[pubKey] {
dlog.Client.Debug("initKnownHostsAuthMethods", "Skipping duplicate signer", source)
return
}
addedPublicKeys[pubKey] = true
signers = append(signers, signer)
dlog.Client.Debug("initKnownHostsAuthMethods", "Added signer", source)
}
addPrivateKeySigner := func(path string) {
if path == "" {
return
}
if addedPrivateKeyPaths[path] {
return
}
signer, err := privateKeySigner(path)
if err != nil {
dlog.Client.Debug("initKnownHostsAuthMethods", "Unable to load private key signer", path, err)
return
}
addedPrivateKeyPaths[path] = true
addSigner(path, signer)
}
// First, the explicit auth key path (or default ~/.ssh/id_rsa).
addPrivateKeySigner(privateKeyPath)
// Second, SSH agent (YubiKey-backed keys are typically exposed here).
loadedAgentSigners, err := agentSigners(agentKeyIndex)
if err == nil {
for i, signer := range loadedAgentSigners {
addSigner(fmt.Sprintf("agent:%d:%d", agentKeyIndex, i), signer)
}
} else {
dlog.Client.Debug("initKnownHostsAuthMethods", "Unable to load SSH agent signers", err)
}
// Third, additional default private key paths.
for _, path := range defaultPrivateKeyPaths {
addPrivateKeySigner(path)
}
return signers
}
|
