func parseHostLine(line []byte) (string, gossh.PublicKey, error) {
end := bytes.IndexByte(line, ' ')
if end <= 0 {
return "", nil, ErrUnfoundHostAddr
}
addr := string(line[:end])
keyByte := line[end+1:]
key, _, _, _, err := gossh.ParseAuthorizedKey(keyByte)
if err != nil {
return "", nil, err
}
return addr, key, nil
}
func parseAuthorizedKeys(in []byte) ([]gossh.PublicKey, error) {
pubkeys := make([]gossh.PublicKey, 0)
for len(in) > 0 {
pubkey, _, _, rest, err := gossh.ParseAuthorizedKey(in)
if err != nil {
return nil, err
}
in = rest
pubkeys = append(pubkeys, pubkey)
}
return pubkeys, nil
}
// TestHostKeyChecker tests to check existing key
func TestHostKeyChecker(t *testing.T) {
keyFile := NewHostKeyFile(hostFile)
checker := NewHostKeyChecker(keyFile, nil, ioutil.Discard)
addr, key, _ := parseHostLine([]byte(hostLine))
tcpAddr, _ := net.ResolveTCPAddr("tcp", addr)
if err := checker.Check("localhost", tcpAddr, key); err != nil {
t.Fatalf("checker should succeed for %v: %v", tcpAddr.String(), err)
}
wrongKey, _, _, _, _ := gossh.ParseAuthorizedKey([]byte(wrongAuthorizedKey))
if err := checker.Check("localhost", tcpAddr, wrongKey); err != ErrUnmatchKey {
t.Fatalf("checker should fail with %v", ErrUnmatchKey)
}
}
// parseKnownHostsLine parses a line from a known hosts file. It returns a
// string containing the hosts section of the line, a gossh.PublicKey parsed
// from the line, and any error encountered during the parsing.
func parseKnownHostsLine(line []byte) (string, gossh.PublicKey, error) {
// Skip any leading whitespace.
line = bytes.TrimLeft(line, "\t ")
// Skip comments and empty lines.
if bytes.HasPrefix(line, []byte("#")) || len(line) == 0 {
return "", nil, nil
}
// Skip markers.
if bytes.HasPrefix(line, []byte("@")) {
return "", nil, errors.New("marker functionality not implemented")
}
// Find the end of the host name(s) portion.
end := bytes.IndexAny(line, "\t ")
if end <= 0 {
return "", nil, errors.New("bad format (insufficient fields)")
}
hosts := string(line[:end])
keyBytes := line[end+1:]
// Check for hashed host names.
if strings.HasPrefix(hosts, sshHashDelim) {
return "", nil, errors.New("hashed hosts not implemented")
}
// Finally, actually try to extract the key.
key, _, _, _, err := gossh.ParseAuthorizedKey(keyBytes)
if err != nil {
return "", nil, fmt.Errorf("error parsing key: %v", err)
}
return hosts, key, nil
}
