From 036a096f05921ed2701a90eb64cd826abbafe714 Mon Sep 17 00:00:00 2001
From: djm <djm@openbsd.org>
Date: Fri, 21 Sep 2018 12:20:12 +0000
Subject: [PATCH] In sshkey_in_file(), ignore keys that are considered for
 being too short (i.e. SSH_ERR_KEY_LENGTH). These keys will not be considered
 to be "in the file". This allows key revocation lists to contain short keys
 without the entire revocation list being considered invalid.

bz#2897; ok dtucker
---
 usr.bin/ssh/authfile.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/usr.bin/ssh/authfile.c b/usr.bin/ssh/authfile.c
index 6309e185390..3b81fa7d972 100644
--- a/usr.bin/ssh/authfile.c
+++ b/usr.bin/ssh/authfile.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: authfile.c,v 1.130 2018/07/09 21:59:10 markus Exp $ */
+/* $OpenBSD: authfile.c,v 1.131 2018/09/21 12:20:12 djm Exp $ */
 /*
  * Copyright (c) 2000, 2013 Markus Friedl.  All rights reserved.
  *
@@ -454,6 +454,8 @@ sshkey_in_file(struct sshkey *key, const char *filename, int strict_type,
 		return SSH_ERR_SYSTEM_ERROR;
 
 	while (getline(&line, &linesize, f) != -1) {
+		sshkey_free(pub);
+		pub = NULL;
 		cp = line;
 
 		/* Skip leading whitespace. */
@@ -472,16 +474,20 @@ sshkey_in_file(struct sshkey *key, const char *filename, int strict_type,
 			r = SSH_ERR_ALLOC_FAIL;
 			goto out;
 		}
-		if ((r = sshkey_read(pub, &cp)) != 0)
+		switch (r = sshkey_read(pub, &cp)) {
+		case 0:
+			break;
+		case SSH_ERR_KEY_LENGTH:
+			continue;
+		default:
 			goto out;
+		}
 		if (sshkey_compare(key, pub) ||
 		    (check_ca && sshkey_is_cert(key) &&
 		    sshkey_compare(key->cert->signature_key, pub))) {
 			r = 0;
 			goto out;
 		}
-		sshkey_free(pub);
-		pub = NULL;
 	}
 	r = SSH_ERR_KEY_NOT_FOUND;
  out:
-- 
2.20.1