From 8275fade44b56aed722ea91bc4586f48babece80 Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Wed, 15 Mar 2006 12:06:23 +1100
Subject: [PATCH]    - dtucker@cvs.openbsd.org 2006/03/13 10:26:52     
 [authfile.c authfile.h ssh-add.c]      Make ssh-add check file permissions
 before attempting to load private      key files multiple times; it will fail
 anyway and this prevents confusing      multiple prompts and warnings. 
 mindrot #1138, ok djm@

---
 ChangeLog  |  7 ++++++-
 authfile.c |  4 ++--
 authfile.h |  3 ++-
 ssh-add.c  | 17 +++++++++++++----
 4 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index c72eeed41..d41b4cb46 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -224,6 +224,11 @@
      [misc.c ssh_config.5 sshd_config.5]
      Allow config directives to contain whitespace by surrounding them by double
      quotes.  mindrot #482, man page help from jmc@, ok djm@
+   - dtucker@cvs.openbsd.org 2006/03/13 10:26:52
+     [authfile.c authfile.h ssh-add.c]
+     Make ssh-add check file permissions before attempting to load private
+     key files multiple times; it will fail anyway and this prevents confusing
+     multiple prompts and warnings.  mindrot #1138, ok djm@
 
 20060313
  - (dtucker) [configure.ac] Bug #1171: Don't use printf("%lld", longlong)
@@ -4125,4 +4130,4 @@
    - (djm) Trim deprecated options from INSTALL. Mention UsePAM
    - (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
 
-$Id: ChangeLog,v 1.4203 2006/03/15 01:05:59 djm Exp $
+$Id: ChangeLog,v 1.4204 2006/03/15 01:06:23 djm Exp $
diff --git a/authfile.c b/authfile.c
index f97cf1820..0656262d0 100644
--- a/authfile.c
+++ b/authfile.c
@@ -36,7 +36,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: authfile.c,v 1.62 2006/02/20 17:19:54 stevesk Exp $");
+RCSID("$OpenBSD: authfile.c,v 1.63 2006/03/13 10:26:52 dtucker Exp $");
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -510,7 +510,7 @@ key_load_private_pem(int fd, int type, const char *passphrase,
 	return prv;
 }
 
-static int
+int
 key_perm_ok(int fd, const char *filename)
 {
 	struct stat st;
diff --git a/authfile.h b/authfile.h
index 7f92701ec..a16caa7a8 100644
--- a/authfile.h
+++ b/authfile.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: authfile.h,v 1.10 2002/05/23 19:24:30 markus Exp $	*/
+/*	$OpenBSD: authfile.h,v 1.11 2006/03/13 10:26:52 dtucker Exp $	*/
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -21,5 +21,6 @@ Key	*key_load_public_type(int, const char *, char **);
 Key	*key_load_private(const char *, const char *, char **);
 Key	*key_load_private_type(int, const char *, const char *, char **);
 Key	*key_load_private_pem(int, int, const char *, char **);
+int	 key_perm_ok(int, const char *);
 
 #endif
diff --git a/ssh-add.c b/ssh-add.c
index 8bfc401e8..59933012d 100644
--- a/ssh-add.c
+++ b/ssh-add.c
@@ -35,7 +35,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: ssh-add.c,v 1.75 2006/02/20 17:19:54 stevesk Exp $");
+RCSID("$OpenBSD: ssh-add.c,v 1.76 2006/03/13 10:26:52 dtucker Exp $");
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -127,16 +127,25 @@ delete_all(AuthenticationConnection *ac)
 static int
 add_file(AuthenticationConnection *ac, const char *filename)
 {
-	struct stat st;
 	Key *private;
 	char *comment = NULL;
 	char msg[1024];
-	int ret = -1;
+	int fd, perms_ok, ret = -1;
 
-	if (stat(filename, &st) < 0) {
+	if ((fd = open(filename, 0)) < 0) {
 		perror(filename);
 		return -1;
 	}
+
+	/*
+	 * Since we'll try to load a keyfile multiple times, permission errors
+	 * will occur multiple times, so check perms first and bail if wrong.
+	 */
+	perms_ok = key_perm_ok(fd, filename);
+	close(fd);
+	if (!perms_ok)
+		return -1;
+
 	/* At first, try empty passphrase */
 	private = key_load_private(filename, "", &comment);
 	if (comment == NULL)