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
|
package ssh
import (
"fmt"
"strings"
"srcd.works/go-git.v4/plumbing/transport"
"srcd.works/go-git.v4/plumbing/transport/internal/common"
"golang.org/x/crypto/ssh"
)
// DefaultClient is the default SSH client.
var DefaultClient = common.NewClient(&runner{})
type runner struct{}
func (r *runner) Command(cmd string, ep transport.Endpoint, auth transport.AuthMethod) (common.Command, error) {
c := &command{command: cmd, endpoint: ep}
if auth != nil {
c.setAuth(auth)
}
if err := c.connect(); err != nil {
return nil, err
}
return c, nil
}
type command struct {
*ssh.Session
connected bool
command string
endpoint transport.Endpoint
client *ssh.Client
auth AuthMethod
}
func (c *command) setAuth(auth transport.AuthMethod) error {
a, ok := auth.(AuthMethod)
if !ok {
return transport.ErrInvalidAuthMethod
}
c.auth = a
return nil
}
func (c *command) Start() error {
return c.Session.Start(endpointToCommand(c.command, c.endpoint))
}
// Close closes the SSH session and connection.
func (c *command) Close() error {
if !c.connected {
return nil
}
c.connected = false
//XXX: If did read the full packfile, then the session might be already
// closed.
_ = c.Session.Close()
return c.client.Close()
}
// connect connects to the SSH server, unless a AuthMethod was set with
// SetAuth method, by default uses an auth method based on PublicKeysCallback,
// it connects to a SSH agent, using the address stored in the SSH_AUTH_SOCK
// environment var.
func (c *command) connect() error {
if c.connected {
return transport.ErrAlreadyConnected
}
if c.auth == nil {
if err := c.setAuthFromEndpoint(); err != nil {
return err
}
}
var err error
c.client, err = ssh.Dial("tcp", c.getHostWithPort(), c.auth.clientConfig())
if err != nil {
return err
}
c.Session, err = c.client.NewSession()
if err != nil {
_ = c.client.Close()
return err
}
c.connected = true
return nil
}
func (c *command) getHostWithPort() string {
host := c.endpoint.Host
if strings.Index(c.endpoint.Host, ":") == -1 {
host += ":22"
}
return host
}
func (c *command) setAuthFromEndpoint() error {
var u string
if info := c.endpoint.User; info != nil {
u = info.Username()
}
var err error
c.auth, err = NewSSHAgentAuth(u)
return err
}
func endpointToCommand(cmd string, ep transport.Endpoint) string {
return fmt.Sprintf("%s '%s'", cmd, ep.Path)
}
|
