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main: Force passphrase auth even with pubkey auth

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This commit is contained in:
Andrey Petrov 2020-04-16 11:30:13 -04:00
parent 77143ad1e6
commit b1bce027ad
1 changed files with 38 additions and 19 deletions
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57
cmd/ssh-chat/cmd.go
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@ -82,7 +82,8 @@ func main() {
}
logLevel := logLevels[numVerbose]
sshchat.SetLogger(golog.New(os.Stderr, logLevel))
logger := golog.New(os.Stderr, logLevel)
sshchat.SetLogger(logger)
if logLevel == log.Debug {
// Enable logging from submodules
@ -113,27 +114,45 @@ func main() {
config := sshd.MakeAuth(auth)
config.AddHostKey(signer)
config.ServerVersion = "SSH-2.0-Go ssh-chat"
// FIXME: Should we be using config.NoClientAuth = true by default?
if options.Passphrase != "" {
cb := config.KeyboardInteractiveCallback
config.KeyboardInteractiveCallback = func(conn ssh.ConnMetadata, challenge ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
perm, err := cb(conn, challenge)
if err != nil {
return perm, err
}
answers, err := challenge("", "", []string{"Passphrase required to connect: "}, []bool{true})
if err != nil {
return nil, err
}
if len(answers) == 1 && answers[0] == options.Passphrase {
// Success
return perm, nil
}
// It's not gonna do much but may as well throttle brute force attempts a little
time.Sleep(2 * time.Second)
return nil, errors.New("incorrect passphrase")
if options.Whitelist != "" {
logger.Warning("Passphrase is disabled while whitelist is enabled.")
}
{
cb := config.KeyboardInteractiveCallback
config.KeyboardInteractiveCallback = func(conn ssh.ConnMetadata, challenge ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
perm, err := cb(conn, challenge)
if err != nil {
return perm, err
}
answers, err := challenge("", "", []string{"Passphrase required to connect: "}, []bool{true})
if err != nil {
return nil, err
}
if len(answers) == 1 && answers[0] == options.Passphrase {
// Success
return perm, nil
}
// It's not gonna do much but may as well throttle brute force attempts a little
time.Sleep(2 * time.Second)
return nil, errors.New("incorrect passphrase")
}
}
{
// We also need to override the PublicKeyCallback to prevent rando pubkeys from bypassing
cb := config.PublicKeyCallback
config.PublicKeyCallback = func(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
perms, err := cb(conn, key)
if err == nil {
err = errors.New("passphrase authentication required")
}
return perms, err
}
}
}
s, err := sshd.ListenSSH(options.Bind, config)