upstream: translate and return error codes; retry on bad PIN

Define some well-known error codes in the SK API and pass
them back via ssh-sk-helper.

Use the new "wrong PIN" error code to retry PIN prompting during
ssh-keygen of resident keys.

feedback and ok markus@

OpenBSD-Commit-ID: 9663c6a2bb7a0bc8deaccc6c30d9a2983b481620

1 files changed, 2 insertions, 1 deletions

diff --git a/ssherr.h b/ssherr.h
index 348da5a20..520bd4964 100644
--- a/ssherr.h
+++ b/ssherr.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: ssherr.h,v 1.6 2018/07/03 11:39:54 djm Exp $  */
+/*      $OpenBSD: ssherr.h,v 1.7 2019/12/30 09:24:45 djm Exp $  */
 /*
  * Copyright (c) 2011 Damien Miller
  *
@@ -80,6 +80,7 @@
 #define SSH_ERR_KEY_LENGTH                      -56
 #define SSH_ERR_NUMBER_TOO_LARGE                -57
 #define SSH_ERR_SIGN_ALG_UNSUPPORTED            -58
+#define SSH_ERR_FEATURE_UNSUPPORTED             -59
 
 /* Translate a numeric error code to a human-readable error string */
 const char *ssh_err(int n);