upstream commit

Skip passwords longer than 1k in length so clients can't
easily DoS sshd by sending very long passwords, causing it to spend CPU
hashing them. feedback djm@, ok markus@.

Brought to our attention by tomas.kuthan at oracle.com, shilei-c at
360.cn and coredump at autistici.org

Upstream-ID: d0af7d4a2190b63ba1d38eec502bc4be0be9e333

1 files changed, 6 insertions, 1 deletions

diff --git a/auth-passwd.c b/auth-passwd.c
index 530b5d4f7..996c2cf71 100644
--- a/auth-passwd.c
+++ b/auth-passwd.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-passwd.c,v 1.44 2014/07/15 15:54:14 millert Exp $ */
+/* $OpenBSD: auth-passwd.c,v 1.45 2016/07/21 01:39:35 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -66,6 +66,8 @@ extern login_cap_t *lc;
 #define DAY             (24L * 60 * 60) /* 1 day in seconds */
 #define TWO_WEEKS       (2L * 7 * DAY)  /* 2 weeks in seconds */
 
+#define MAX_PASSWORD_LEN        1024
+
 void
 disable_forwarding(void)
 {
@@ -87,6 +89,9 @@ auth_password(Authctxt *authctxt, const char *password)
         static int expire_checked = 0;
 #endif
 
+        if (strlen(password) > MAX_PASSWORD_LEN)
+                return 0;
+
 #ifndef HAVE_CYGWIN
         if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
                 ok = 0;