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|
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
}
|
