From 27c977adb2a78e861a4fe5272ab8a41d8c3cd8c0 Mon Sep 17 00:00:00 2001
From: Nick Couchman <vnick@apache.org>
Date: Mon, 28 May 2018 10:23:47 -0400
Subject: [PATCH] GUACAMOLE-527: Make sure ssh_known_hosts exists before trying
 to load.

---
 src/common-ssh/key.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/common-ssh/key.c b/src/common-ssh/key.c
index 570da8e8..66b8386b 100644
--- a/src/common-ssh/key.c
+++ b/src/common-ssh/key.c
@@ -35,6 +35,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 guac_common_ssh_key* guac_common_ssh_key_alloc(char* data, int length,
         char* passphrase) {
@@ -268,7 +269,8 @@ int guac_common_ssh_verify_host_key(LIBSSH2_SESSION* session, guac_client* clien
     else {
 
         const char *guac_known_hosts = "/etc/guacamole/ssh_known_hosts";
-        known_hosts = libssh2_knownhost_readfile(ssh_known_hosts, guac_known_hosts, LIBSSH2_KNOWNHOST_FILE_OPENSSH);
+        if (access(guac_known_hosts, F_OK) != -1)
+            known_hosts = libssh2_knownhost_readfile(ssh_known_hosts, guac_known_hosts, LIBSSH2_KNOWNHOST_FILE_OPENSSH);
 
     }