upstream: cap the number of permiopen/permitlisten directives we're

willing to parse on a single authorized_keys line; ok deraadt@

OpenBSD-Commit-ID: a43a752c2555d26aa3fc754805a476f6e3e30f46

2 files changed, 6 insertions, 3 deletions

diff --git a/auth-options.c b/auth-options.c
index 4923a83b7..514221882 100644
--- a/auth-options.c
+++ b/auth-options.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-options.c,v 1.85 2019/06/27 18:03:37 deraadt Exp $ */
+/* $OpenBSD: auth-options.c,v 1.86 2019/07/09 04:15:00 djm Exp $ */
 /*
  * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
  *
@@ -320,7 +320,7 @@ handle_permit(const char **optsp, int allow_bare_port,
         size_t npermits = *npermitsp;
         const char *errstr = "unknown error";
 
-        if (npermits > INT_MAX) {
+        if (npermits > SSH_AUTHOPT_PERMIT_MAX) {
                 *errstrp = "too many permission directives";
                 return -1;
         }
diff --git a/auth-options.h b/auth-options.h
index 0462983b5..14cbfa49d 100644
--- a/auth-options.h
+++ b/auth-options.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-options.h,v 1.27 2018/06/06 18:23:32 djm Exp $ */
+/* $OpenBSD: auth-options.h,v 1.28 2019/07/09 04:15:00 djm Exp $ */
 
 /*
  * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
@@ -22,6 +22,9 @@
 struct passwd;
 struct sshkey;
 
+/* Maximum number of permitopen/permitlisten directives to accept */
+#define SSH_AUTHOPT_PERMIT_MAX 4096
+
 /*
  * sshauthopt represents key options parsed from authorized_keys or
  * from certificate extensions/options.