From aa9c1b66a046c2aa699dff8f1689345dacbd106e Mon Sep 17 00:00:00 2001
From: Life Coder <user@DESKTOP-91L2DMF>
Date: Mon, 25 Feb 2019 09:57:18 +0100
Subject: [PATCH] Fix #1257

---
 libi2pd_client/SAM.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libi2pd_client/SAM.cpp b/libi2pd_client/SAM.cpp
index 0dc73d72..d21f4051 100644
--- a/libi2pd_client/SAM.cpp
+++ b/libi2pd_client/SAM.cpp
@@ -359,6 +359,20 @@ namespace client
 			}
 			forward = std::make_shared<boost::asio::ip::udp::endpoint>(addr, port);
 		}
+		
+		//ensure we actually received a destination
+		if (destination.empty())
+		{
+			SendMessageReply (SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_STATUS_INVALID_KEY), true);
+			return;
+		}
+
+		//ensure it's a base64 string
+		if (!keys.FromBase64(destination))
+		{
+			SendMessageReply(SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_STATUS_INVALID_KEY), true);
+			return;
+		}
 
 		// create destination
 		auto session = m_Owner.CreateSession (id, destination == SAM_VALUE_TRANSIENT ? "" : destination, &params);