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