84 lines
1.3 KiB
Go
84 lines
1.3 KiB
Go
package ssh
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"encoding/binary"
|
|
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
func generateSigner() (ssh.Signer, error) {
|
|
key, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return ssh.NewSignerFromKey(key)
|
|
}
|
|
|
|
func parsePtyRequest(s []byte) (pty Pty, ok bool) {
|
|
term, s, ok := parseString(s)
|
|
if !ok {
|
|
return
|
|
}
|
|
width32, s, ok := parseUint32(s)
|
|
if !ok {
|
|
return
|
|
}
|
|
height32, _, ok := parseUint32(s)
|
|
if !ok {
|
|
return
|
|
}
|
|
pty = Pty{
|
|
Term: term,
|
|
Window: Window{
|
|
Width: int(width32),
|
|
Height: int(height32),
|
|
},
|
|
}
|
|
return
|
|
}
|
|
|
|
func parseWinchRequest(s []byte) (win Window, ok bool) {
|
|
width32, s, ok := parseUint32(s)
|
|
if width32 < 1 {
|
|
ok = false
|
|
}
|
|
if !ok {
|
|
return
|
|
}
|
|
height32, _, ok := parseUint32(s)
|
|
if height32 < 1 {
|
|
ok = false
|
|
}
|
|
if !ok {
|
|
return
|
|
}
|
|
win = Window{
|
|
Width: int(width32),
|
|
Height: int(height32),
|
|
}
|
|
return
|
|
}
|
|
|
|
func parseString(in []byte) (out string, rest []byte, ok bool) {
|
|
if len(in) < 4 {
|
|
return
|
|
}
|
|
length := binary.BigEndian.Uint32(in)
|
|
if uint32(len(in)) < 4+length {
|
|
return
|
|
}
|
|
out = string(in[4 : 4+length])
|
|
rest = in[4+length:]
|
|
ok = true
|
|
return
|
|
}
|
|
|
|
func parseUint32(in []byte) (uint32, []byte, bool) {
|
|
if len(in) < 4 {
|
|
return 0, nil, false
|
|
}
|
|
return binary.BigEndian.Uint32(in), in[4:], true
|
|
}
|